/usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/CodeGen/SelectionDAGNodes.h

Bug Summary

File:	src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/CodeGen/SelectionDAGNodes.h
Warning:	line 1110, column 10 Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SIISelLowering.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/libLLVM/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Analysis -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ASMParser -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/BinaryFormat -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Bitcode -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Bitcode -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Bitstream -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /include/llvm/CodeGen -I /include/llvm/CodeGen/PBQP -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/IR -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/IR -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/Coroutines -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ProfileData/Coverage -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/CodeView -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/DWARF -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/MSF -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/PDB -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Demangle -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ExecutionEngine -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ExecutionEngine/JITLink -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ExecutionEngine/Orc -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Frontend -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Frontend/OpenACC -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Frontend -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Frontend/OpenMP -I /include/llvm/CodeGen/GlobalISel -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/IRReader -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/InstCombine -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/Transforms/InstCombine -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/LTO -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Linker -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/MC -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/MC/MCParser -I /include/llvm/CodeGen/MIRParser -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Object -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Option -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Passes -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ProfileData -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/Scalar -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/ADT -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Support -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/DebugInfo/Symbolize -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Target -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/Utils -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/Vectorize -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include/llvm/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/X86 -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Transforms/IPO -I /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/libLLVM/../include -I /usr/src/gnu/usr.bin/clang/libLLVM/obj -I /usr/src/gnu/usr.bin/clang/libLLVM/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -D PIC -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/libLLVM/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -D_RET_PROTECTOR -ret-protector -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU/SIISelLowering.cpp

/usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU/SIISelLowering.cpp

→

1//===-- SIISelLowering.cpp - SI DAG Lowering Implementation ---------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9/// \file
10/// Custom DAG lowering for SI
11//
12//===----------------------------------------------------------------------===//

14#include "SIISelLowering.h"
15#include "AMDGPU.h"
16#include "AMDGPUInstrInfo.h"
17#include "AMDGPUTargetMachine.h"
18#include "SIMachineFunctionInfo.h"
19#include "SIRegisterInfo.h"
20#include "llvm/ADT/Statistic.h"
21#include "llvm/Analysis/LegacyDivergenceAnalysis.h"
22#include "llvm/BinaryFormat/ELF.h"
23#include "llvm/CodeGen/Analysis.h"
24#include "llvm/CodeGen/FunctionLoweringInfo.h"
25#include "llvm/CodeGen/GlobalISel/GISelKnownBits.h"
26#include "llvm/CodeGen/MachineLoopInfo.h"
27#include "llvm/IR/DiagnosticInfo.h"
28#include "llvm/IR/IntrinsicInst.h"
29#include "llvm/IR/IntrinsicsAMDGPU.h"
30#include "llvm/IR/IntrinsicsR600.h"
31#include "llvm/Support/CommandLine.h"
32#include "llvm/Support/KnownBits.h"

34using namespace llvm;

36#define DEBUG_TYPE"si-lower" "si-lower"

38STATISTIC(NumTailCalls, "Number of tail calls")static llvm::Statistic NumTailCalls = {"si-lower", "NumTailCalls"
, "Number of tail calls"};

40static cl::opt<bool> DisableLoopAlignment(
"amdgpu-disable-loop-alignment",
cl::desc("Do not align and prefetch loops"),
cl::init(false));

45static cl::opt<bool> VGPRReserveforSGPRSpill(
  "amdgpu-reserve-vgpr-for-sgpr-spill",
  cl::desc("Allocates one VGPR for future SGPR Spill"), cl::init(true));

49static cl::opt<bool> UseDivergentRegisterIndexing(
"amdgpu-use-divergent-register-indexing",
cl::Hidden,
cl::desc("Use indirect register addressing for divergent indexes"),
cl::init(false));

55static bool hasFP32Denormals(const MachineFunction &MF) {
const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
return Info->getMode().allFP32Denormals();
58}

60static bool hasFP64FP16Denormals(const MachineFunction &MF) {
const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
return Info->getMode().allFP64FP16Denormals();
63}

65static unsigned findFirstFreeSGPR(CCState &CCInfo) {
unsigned NumSGPRs = AMDGPU::SGPR_32RegClass.getNumRegs();
for (unsigned Reg = 0; Reg < NumSGPRs; ++Reg) {
  if (!CCInfo.isAllocated(AMDGPU::SGPR0 + Reg)) {
    return AMDGPU::SGPR0 + Reg;
  }
}
llvm_unreachable("Cannot allocate sgpr")__builtin_unreachable();
73}

75SITargetLowering::SITargetLowering(const TargetMachine &TM,
                                 const GCNSubtarget &STI)
  : AMDGPUTargetLowering(TM, STI),
    Subtarget(&STI) {
addRegisterClass(MVT::i1, &AMDGPU::VReg_1RegClass);
addRegisterClass(MVT::i64, &AMDGPU::SReg_64RegClass);

addRegisterClass(MVT::i32, &AMDGPU::SReg_32RegClass);
addRegisterClass(MVT::f32, &AMDGPU::VGPR_32RegClass);

addRegisterClass(MVT::v2i32, &AMDGPU::SReg_64RegClass);

const SIRegisterInfo *TRI = STI.getRegisterInfo();
const TargetRegisterClass *V64RegClass = TRI->getVGPR64Class();

addRegisterClass(MVT::f64, V64RegClass);
addRegisterClass(MVT::v2f32, V64RegClass);

addRegisterClass(MVT::v3i32, &AMDGPU::SGPR_96RegClass);
addRegisterClass(MVT::v3f32, TRI->getVGPRClassForBitWidth(96));

addRegisterClass(MVT::v2i64, &AMDGPU::SGPR_128RegClass);
addRegisterClass(MVT::v2f64, &AMDGPU::SGPR_128RegClass);

addRegisterClass(MVT::v4i32, &AMDGPU::SGPR_128RegClass);
addRegisterClass(MVT::v4f32, TRI->getVGPRClassForBitWidth(128));

addRegisterClass(MVT::v5i32, &AMDGPU::SGPR_160RegClass);
addRegisterClass(MVT::v5f32, TRI->getVGPRClassForBitWidth(160));

addRegisterClass(MVT::v6i32, &AMDGPU::SGPR_192RegClass);
addRegisterClass(MVT::v6f32, TRI->getVGPRClassForBitWidth(192));

addRegisterClass(MVT::v3i64, &AMDGPU::SGPR_192RegClass);
addRegisterClass(MVT::v3f64, TRI->getVGPRClassForBitWidth(192));

addRegisterClass(MVT::v7i32, &AMDGPU::SGPR_224RegClass);
addRegisterClass(MVT::v7f32, TRI->getVGPRClassForBitWidth(224));

addRegisterClass(MVT::v8i32, &AMDGPU::SGPR_256RegClass);
addRegisterClass(MVT::v8f32, TRI->getVGPRClassForBitWidth(256));

addRegisterClass(MVT::v4i64, &AMDGPU::SGPR_256RegClass);
addRegisterClass(MVT::v4f64, TRI->getVGPRClassForBitWidth(256));

addRegisterClass(MVT::v16i32, &AMDGPU::SGPR_512RegClass);
addRegisterClass(MVT::v16f32, TRI->getVGPRClassForBitWidth(512));

addRegisterClass(MVT::v8i64, &AMDGPU::SGPR_512RegClass);
addRegisterClass(MVT::v8f64, TRI->getVGPRClassForBitWidth(512));

addRegisterClass(MVT::v16i64, &AMDGPU::SGPR_1024RegClass);
addRegisterClass(MVT::v16f64, TRI->getVGPRClassForBitWidth(1024));

if (Subtarget->has16BitInsts()) {
  addRegisterClass(MVT::i16, &AMDGPU::SReg_32RegClass);
  addRegisterClass(MVT::f16, &AMDGPU::SReg_32RegClass);

  // Unless there are also VOP3P operations, not operations are really legal.
  addRegisterClass(MVT::v2i16, &AMDGPU::SReg_32RegClass);
  addRegisterClass(MVT::v2f16, &AMDGPU::SReg_32RegClass);
  addRegisterClass(MVT::v4i16, &AMDGPU::SReg_64RegClass);
  addRegisterClass(MVT::v4f16, &AMDGPU::SReg_64RegClass);
}

addRegisterClass(MVT::v32i32, &AMDGPU::VReg_1024RegClass);
addRegisterClass(MVT::v32f32, TRI->getVGPRClassForBitWidth(1024));

computeRegisterProperties(Subtarget->getRegisterInfo());

// The boolean content concept here is too inflexible. Compares only ever
// really produce a 1-bit result. Any copy/extend from these will turn into a
// select, and zext/1 or sext/-1 are equally cheap. Arbitrarily choose 0/1, as
// it's what most targets use.
setBooleanContents(ZeroOrOneBooleanContent);
setBooleanVectorContents(ZeroOrOneBooleanContent);

// We need to custom lower vector stores from local memory
setOperationAction(ISD::LOAD, MVT::v2i32, Custom);
setOperationAction(ISD::LOAD, MVT::v3i32, Custom);
setOperationAction(ISD::LOAD, MVT::v4i32, Custom);
setOperationAction(ISD::LOAD, MVT::v5i32, Custom);
setOperationAction(ISD::LOAD, MVT::v6i32, Custom);
setOperationAction(ISD::LOAD, MVT::v7i32, Custom);
setOperationAction(ISD::LOAD, MVT::v8i32, Custom);
setOperationAction(ISD::LOAD, MVT::v16i32, Custom);
setOperationAction(ISD::LOAD, MVT::i1, Custom);
setOperationAction(ISD::LOAD, MVT::v32i32, Custom);

setOperationAction(ISD::STORE, MVT::v2i32, Custom);
setOperationAction(ISD::STORE, MVT::v3i32, Custom);
setOperationAction(ISD::STORE, MVT::v4i32, Custom);
setOperationAction(ISD::STORE, MVT::v5i32, Custom);
setOperationAction(ISD::STORE, MVT::v6i32, Custom);
setOperationAction(ISD::STORE, MVT::v7i32, Custom);
setOperationAction(ISD::STORE, MVT::v8i32, Custom);
setOperationAction(ISD::STORE, MVT::v16i32, Custom);
setOperationAction(ISD::STORE, MVT::i1, Custom);
setOperationAction(ISD::STORE, MVT::v32i32, Custom);

setTruncStoreAction(MVT::v2i32, MVT::v2i16, Expand);
setTruncStoreAction(MVT::v3i32, MVT::v3i16, Expand);
setTruncStoreAction(MVT::v4i32, MVT::v4i16, Expand);
setTruncStoreAction(MVT::v8i32, MVT::v8i16, Expand);
setTruncStoreAction(MVT::v16i32, MVT::v16i16, Expand);
setTruncStoreAction(MVT::v32i32, MVT::v32i16, Expand);
setTruncStoreAction(MVT::v2i32, MVT::v2i8, Expand);
setTruncStoreAction(MVT::v4i32, MVT::v4i8, Expand);
setTruncStoreAction(MVT::v8i32, MVT::v8i8, Expand);
setTruncStoreAction(MVT::v16i32, MVT::v16i8, Expand);
setTruncStoreAction(MVT::v32i32, MVT::v32i8, Expand);
setTruncStoreAction(MVT::v2i16, MVT::v2i8, Expand);
setTruncStoreAction(MVT::v4i16, MVT::v4i8, Expand);
setTruncStoreAction(MVT::v8i16, MVT::v8i8, Expand);
setTruncStoreAction(MVT::v16i16, MVT::v16i8, Expand);
setTruncStoreAction(MVT::v32i16, MVT::v32i8, Expand);

setTruncStoreAction(MVT::v3i64, MVT::v3i16, Expand);
setTruncStoreAction(MVT::v3i64, MVT::v3i32, Expand);
setTruncStoreAction(MVT::v4i64, MVT::v4i8, Expand);
setTruncStoreAction(MVT::v8i64, MVT::v8i8, Expand);
setTruncStoreAction(MVT::v8i64, MVT::v8i16, Expand);
setTruncStoreAction(MVT::v8i64, MVT::v8i32, Expand);
setTruncStoreAction(MVT::v16i64, MVT::v16i32, Expand);

setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);

setOperationAction(ISD::SELECT, MVT::i1, Promote);
setOperationAction(ISD::SELECT, MVT::i64, Custom);
setOperationAction(ISD::SELECT, MVT::f64, Promote);
AddPromotedToType(ISD::SELECT, MVT::f64, MVT::i64);

setOperationAction(ISD::SELECT_CC, MVT::f32, Expand);
setOperationAction(ISD::SELECT_CC, MVT::i32, Expand);
setOperationAction(ISD::SELECT_CC, MVT::i64, Expand);
setOperationAction(ISD::SELECT_CC, MVT::f64, Expand);
setOperationAction(ISD::SELECT_CC, MVT::i1, Expand);

setOperationAction(ISD::SETCC, MVT::i1, Promote);
setOperationAction(ISD::SETCC, MVT::v2i1, Expand);
setOperationAction(ISD::SETCC, MVT::v4i1, Expand);
AddPromotedToType(ISD::SETCC, MVT::i1, MVT::i32);

setOperationAction(ISD::TRUNCATE, MVT::v2i32, Expand);
setOperationAction(ISD::FP_ROUND, MVT::v2f32, Expand);
setOperationAction(ISD::TRUNCATE, MVT::v3i32, Expand);
setOperationAction(ISD::FP_ROUND, MVT::v3f32, Expand);
setOperationAction(ISD::TRUNCATE, MVT::v4i32, Expand);
setOperationAction(ISD::FP_ROUND, MVT::v4f32, Expand);
setOperationAction(ISD::TRUNCATE, MVT::v5i32, Expand);
setOperationAction(ISD::FP_ROUND, MVT::v5f32, Expand);
setOperationAction(ISD::TRUNCATE, MVT::v6i32, Expand);
setOperationAction(ISD::FP_ROUND, MVT::v6f32, Expand);
setOperationAction(ISD::TRUNCATE, MVT::v7i32, Expand);
setOperationAction(ISD::FP_ROUND, MVT::v7f32, Expand);
setOperationAction(ISD::TRUNCATE, MVT::v8i32, Expand);
setOperationAction(ISD::FP_ROUND, MVT::v8f32, Expand);
setOperationAction(ISD::TRUNCATE, MVT::v16i32, Expand);
setOperationAction(ISD::FP_ROUND, MVT::v16f32, Expand);

setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i1, Custom);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i1, Custom);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i8, Custom);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i8, Custom);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i16, Custom);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v3i16, Custom);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i16, Custom);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::Other, Custom);

setOperationAction(ISD::BRCOND, MVT::Other, Custom);
setOperationAction(ISD::BR_CC, MVT::i1, Expand);
setOperationAction(ISD::BR_CC, MVT::i32, Expand);
setOperationAction(ISD::BR_CC, MVT::i64, Expand);
setOperationAction(ISD::BR_CC, MVT::f32, Expand);
setOperationAction(ISD::BR_CC, MVT::f64, Expand);

setOperationAction(ISD::UADDO, MVT::i32, Legal);
setOperationAction(ISD::USUBO, MVT::i32, Legal);

setOperationAction(ISD::ADDCARRY, MVT::i32, Legal);
setOperationAction(ISD::SUBCARRY, MVT::i32, Legal);

setOperationAction(ISD::SHL_PARTS, MVT::i64, Expand);
setOperationAction(ISD::SRA_PARTS, MVT::i64, Expand);
setOperationAction(ISD::SRL_PARTS, MVT::i64, Expand);

262#if 0
setOperationAction(ISD::ADDCARRY, MVT::i64, Legal);
setOperationAction(ISD::SUBCARRY, MVT::i64, Legal);
265#endif

// We only support LOAD/STORE and vector manipulation ops for vectors
// with > 4 elements.
for (MVT VT : { MVT::v8i32, MVT::v8f32, MVT::v16i32, MVT::v16f32,
                MVT::v2i64, MVT::v2f64, MVT::v4i16, MVT::v4f16,
                MVT::v3i64, MVT::v3f64, MVT::v6i32, MVT::v6f32,
                MVT::v4i64, MVT::v4f64, MVT::v8i64, MVT::v8f64,
                MVT::v16i64, MVT::v16f64, MVT::v32i32, MVT::v32f32 }) {
  for (unsigned Op = 0; Op < ISD::BUILTIN_OP_END; ++Op) {
    switch (Op) {
    case ISD::LOAD:
    case ISD::STORE:
    case ISD::BUILD_VECTOR:
    case ISD::BITCAST:
    case ISD::EXTRACT_VECTOR_ELT:
    case ISD::INSERT_VECTOR_ELT:
    case ISD::EXTRACT_SUBVECTOR:
    case ISD::SCALAR_TO_VECTOR:
      break;
    case ISD::INSERT_SUBVECTOR:
    case ISD::CONCAT_VECTORS:
      setOperationAction(Op, VT, Custom);
      break;
    default:
      setOperationAction(Op, VT, Expand);
      break;
    }
  }
}

setOperationAction(ISD::FP_EXTEND, MVT::v4f32, Expand);

// TODO: For dynamic 64-bit vector inserts/extracts, should emit a pseudo that
// is expanded to avoid having two separate loops in case the index is a VGPR.

// Most operations are naturally 32-bit vector operations. We only support
// load and store of i64 vectors, so promote v2i64 vector operations to v4i32.
for (MVT Vec64 : { MVT::v2i64, MVT::v2f64 }) {
  setOperationAction(ISD::BUILD_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::BUILD_VECTOR, Vec64, MVT::v4i32);

  setOperationAction(ISD::EXTRACT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::EXTRACT_VECTOR_ELT, Vec64, MVT::v4i32);

  setOperationAction(ISD::INSERT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::INSERT_VECTOR_ELT, Vec64, MVT::v4i32);

  setOperationAction(ISD::SCALAR_TO_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::SCALAR_TO_VECTOR, Vec64, MVT::v4i32);
}

for (MVT Vec64 : { MVT::v3i64, MVT::v3f64 }) {
  setOperationAction(ISD::BUILD_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::BUILD_VECTOR, Vec64, MVT::v6i32);

  setOperationAction(ISD::EXTRACT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::EXTRACT_VECTOR_ELT, Vec64, MVT::v6i32);

  setOperationAction(ISD::INSERT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::INSERT_VECTOR_ELT, Vec64, MVT::v6i32);

  setOperationAction(ISD::SCALAR_TO_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::SCALAR_TO_VECTOR, Vec64, MVT::v6i32);
}

for (MVT Vec64 : { MVT::v4i64, MVT::v4f64 }) {
  setOperationAction(ISD::BUILD_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::BUILD_VECTOR, Vec64, MVT::v8i32);

  setOperationAction(ISD::EXTRACT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::EXTRACT_VECTOR_ELT, Vec64, MVT::v8i32);

  setOperationAction(ISD::INSERT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::INSERT_VECTOR_ELT, Vec64, MVT::v8i32);

  setOperationAction(ISD::SCALAR_TO_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::SCALAR_TO_VECTOR, Vec64, MVT::v8i32);
}

for (MVT Vec64 : { MVT::v8i64, MVT::v8f64 }) {
  setOperationAction(ISD::BUILD_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::BUILD_VECTOR, Vec64, MVT::v16i32);

  setOperationAction(ISD::EXTRACT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::EXTRACT_VECTOR_ELT, Vec64, MVT::v16i32);

  setOperationAction(ISD::INSERT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::INSERT_VECTOR_ELT, Vec64, MVT::v16i32);

  setOperationAction(ISD::SCALAR_TO_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::SCALAR_TO_VECTOR, Vec64, MVT::v16i32);
}

for (MVT Vec64 : { MVT::v16i64, MVT::v16f64 }) {
  setOperationAction(ISD::BUILD_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::BUILD_VECTOR, Vec64, MVT::v32i32);

  setOperationAction(ISD::EXTRACT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::EXTRACT_VECTOR_ELT, Vec64, MVT::v32i32);

  setOperationAction(ISD::INSERT_VECTOR_ELT, Vec64, Promote);
  AddPromotedToType(ISD::INSERT_VECTOR_ELT, Vec64, MVT::v32i32);

  setOperationAction(ISD::SCALAR_TO_VECTOR, Vec64, Promote);
  AddPromotedToType(ISD::SCALAR_TO_VECTOR, Vec64, MVT::v32i32);
}

setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v8i32, Expand);
setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v8f32, Expand);
setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i32, Expand);
setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16f32, Expand);

setOperationAction(ISD::BUILD_VECTOR, MVT::v4f16, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4i16, Custom);

// Avoid stack access for these.
// TODO: Generalize to more vector types.
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i16, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f16, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i16, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2f16, Custom);

setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i8, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4i8, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v8i8, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i8, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i8, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i8, Custom);

setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4i16, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f16, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i16, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f16, Custom);

// Deal with vec3 vector operations when widened to vec4.
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v3i32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v3f32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v4i32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v4f32, Custom);

// Deal with vec5/6/7 vector operations when widened to vec8.
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v5i32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v5f32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v6i32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v6f32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v7i32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v7f32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v8i32, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v8f32, Custom);

// BUFFER/FLAT_ATOMIC_CMP_SWAP on GCN GPUs needs input marshalling,
// and output demarshalling
setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i32, Custom);
setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i64, Custom);

// We can't return success/failure, only the old value,
// let LLVM add the comparison
setOperationAction(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, MVT::i32, Expand);
setOperationAction(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, MVT::i64, Expand);

if (Subtarget->hasFlatAddressSpace()) {
  setOperationAction(ISD::ADDRSPACECAST, MVT::i32, Custom);
  setOperationAction(ISD::ADDRSPACECAST, MVT::i64, Custom);
}

setOperationAction(ISD::BITREVERSE, MVT::i32, Legal);
setOperationAction(ISD::BITREVERSE, MVT::i64, Legal);

// FIXME: This should be narrowed to i32, but that only happens if i64 is
// illegal.
// FIXME: Should lower sub-i32 bswaps to bit-ops without v_perm_b32.
setOperationAction(ISD::BSWAP, MVT::i64, Legal);
setOperationAction(ISD::BSWAP, MVT::i32, Legal);

// On SI this is s_memtime and s_memrealtime on VI.
setOperationAction(ISD::READCYCLECOUNTER, MVT::i64, Legal);
setOperationAction(ISD::TRAP, MVT::Other, Custom);
setOperationAction(ISD::DEBUGTRAP, MVT::Other, Custom);

if (Subtarget->has16BitInsts()) {
  setOperationAction(ISD::FPOW, MVT::f16, Promote);
  setOperationAction(ISD::FPOWI, MVT::f16, Promote);
  setOperationAction(ISD::FLOG, MVT::f16, Custom);
  setOperationAction(ISD::FEXP, MVT::f16, Custom);
  setOperationAction(ISD::FLOG10, MVT::f16, Custom);
}

if (Subtarget->hasMadMacF32Insts())
  setOperationAction(ISD::FMAD, MVT::f32, Legal);

if (!Subtarget->hasBFI()) {
  // fcopysign can be done in a single instruction with BFI.
  setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
  setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
}

if (!Subtarget->hasBCNT(32))
  setOperationAction(ISD::CTPOP, MVT::i32, Expand);

if (!Subtarget->hasBCNT(64))
  setOperationAction(ISD::CTPOP, MVT::i64, Expand);

if (Subtarget->hasFFBH())
  setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Custom);

if (Subtarget->hasFFBL())
  setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Custom);

// We only really have 32-bit BFE instructions (and 16-bit on VI).
//
// On SI+ there are 64-bit BFEs, but they are scalar only and there isn't any
// effort to match them now. We want this to be false for i64 cases when the
// extraction isn't restricted to the upper or lower half. Ideally we would
// have some pass reduce 64-bit extracts to 32-bit if possible. Extracts that
// span the midpoint are probably relatively rare, so don't worry about them
// for now.
if (Subtarget->hasBFE())
  setHasExtractBitsInsn(true);

// Clamp modifier on add/sub
if (Subtarget->hasIntClamp()) {
  setOperationAction(ISD::UADDSAT, MVT::i32, Legal);
  setOperationAction(ISD::USUBSAT, MVT::i32, Legal);
}

if (Subtarget->hasAddNoCarry()) {
  setOperationAction(ISD::SADDSAT, MVT::i16, Legal);
  setOperationAction(ISD::SSUBSAT, MVT::i16, Legal);
  setOperationAction(ISD::SADDSAT, MVT::i32, Legal);
  setOperationAction(ISD::SSUBSAT, MVT::i32, Legal);
}

setOperationAction(ISD::FMINNUM, MVT::f32, Custom);
setOperationAction(ISD::FMAXNUM, MVT::f32, Custom);
setOperationAction(ISD::FMINNUM, MVT::f64, Custom);
setOperationAction(ISD::FMAXNUM, MVT::f64, Custom);


// These are really only legal for ieee_mode functions. We should be avoiding
// them for functions that don't have ieee_mode enabled, so just say they are
// legal.
setOperationAction(ISD::FMINNUM_IEEE, MVT::f32, Legal);
setOperationAction(ISD::FMAXNUM_IEEE, MVT::f32, Legal);
setOperationAction(ISD::FMINNUM_IEEE, MVT::f64, Legal);
setOperationAction(ISD::FMAXNUM_IEEE, MVT::f64, Legal);


if (Subtarget->haveRoundOpsF64()) {
  setOperationAction(ISD::FTRUNC, MVT::f64, Legal);
  setOperationAction(ISD::FCEIL, MVT::f64, Legal);
  setOperationAction(ISD::FRINT, MVT::f64, Legal);
} else {
  setOperationAction(ISD::FCEIL, MVT::f64, Custom);
  setOperationAction(ISD::FTRUNC, MVT::f64, Custom);
  setOperationAction(ISD::FRINT, MVT::f64, Custom);
  setOperationAction(ISD::FFLOOR, MVT::f64, Custom);
}

setOperationAction(ISD::FFLOOR, MVT::f64, Legal);

setOperationAction(ISD::FSIN, MVT::f32, Custom);
setOperationAction(ISD::FCOS, MVT::f32, Custom);
setOperationAction(ISD::FDIV, MVT::f32, Custom);
setOperationAction(ISD::FDIV, MVT::f64, Custom);

if (Subtarget->has16BitInsts()) {
  setOperationAction(ISD::Constant, MVT::i16, Legal);

  setOperationAction(ISD::SMIN, MVT::i16, Legal);
  setOperationAction(ISD::SMAX, MVT::i16, Legal);

  setOperationAction(ISD::UMIN, MVT::i16, Legal);
  setOperationAction(ISD::UMAX, MVT::i16, Legal);

  setOperationAction(ISD::SIGN_EXTEND, MVT::i16, Promote);
  AddPromotedToType(ISD::SIGN_EXTEND, MVT::i16, MVT::i32);

  setOperationAction(ISD::ROTR, MVT::i16, Expand);
  setOperationAction(ISD::ROTL, MVT::i16, Expand);

  setOperationAction(ISD::SDIV, MVT::i16, Promote);
  setOperationAction(ISD::UDIV, MVT::i16, Promote);
  setOperationAction(ISD::SREM, MVT::i16, Promote);
  setOperationAction(ISD::UREM, MVT::i16, Promote);
  setOperationAction(ISD::UADDSAT, MVT::i16, Legal);
  setOperationAction(ISD::USUBSAT, MVT::i16, Legal);

  setOperationAction(ISD::BITREVERSE, MVT::i16, Promote);

  setOperationAction(ISD::CTTZ, MVT::i16, Promote);
  setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i16, Promote);
  setOperationAction(ISD::CTLZ, MVT::i16, Promote);
  setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i16, Promote);
  setOperationAction(ISD::CTPOP, MVT::i16, Promote);

  setOperationAction(ISD::SELECT_CC, MVT::i16, Expand);

  setOperationAction(ISD::BR_CC, MVT::i16, Expand);

  setOperationAction(ISD::LOAD, MVT::i16, Custom);

  setTruncStoreAction(MVT::i64, MVT::i16, Expand);

  setOperationAction(ISD::FP16_TO_FP, MVT::i16, Promote);
  AddPromotedToType(ISD::FP16_TO_FP, MVT::i16, MVT::i32);
  setOperationAction(ISD::FP_TO_FP16, MVT::i16, Promote);
  AddPromotedToType(ISD::FP_TO_FP16, MVT::i16, MVT::i32);

  setOperationAction(ISD::FP_TO_SINT, MVT::i16, Custom);
  setOperationAction(ISD::FP_TO_UINT, MVT::i16, Custom);

  // F16 - Constant Actions.
  setOperationAction(ISD::ConstantFP, MVT::f16, Legal);

  // F16 - Load/Store Actions.
  setOperationAction(ISD::LOAD, MVT::f16, Promote);
  AddPromotedToType(ISD::LOAD, MVT::f16, MVT::i16);
  setOperationAction(ISD::STORE, MVT::f16, Promote);
  AddPromotedToType(ISD::STORE, MVT::f16, MVT::i16);

  // F16 - VOP1 Actions.
  setOperationAction(ISD::FP_ROUND, MVT::f16, Custom);
  setOperationAction(ISD::FCOS, MVT::f16, Custom);
  setOperationAction(ISD::FSIN, MVT::f16, Custom);

  setOperationAction(ISD::SINT_TO_FP, MVT::i16, Custom);
  setOperationAction(ISD::UINT_TO_FP, MVT::i16, Custom);

  setOperationAction(ISD::FP_TO_SINT, MVT::f16, Promote);
  setOperationAction(ISD::FP_TO_UINT, MVT::f16, Promote);
  setOperationAction(ISD::SINT_TO_FP, MVT::f16, Promote);
  setOperationAction(ISD::UINT_TO_FP, MVT::f16, Promote);
  setOperationAction(ISD::FROUND, MVT::f16, Custom);

  // F16 - VOP2 Actions.
  setOperationAction(ISD::BR_CC, MVT::f16, Expand);
  setOperationAction(ISD::SELECT_CC, MVT::f16, Expand);

  setOperationAction(ISD::FDIV, MVT::f16, Custom);

  // F16 - VOP3 Actions.
  setOperationAction(ISD::FMA, MVT::f16, Legal);
  if (STI.hasMadF16())
    setOperationAction(ISD::FMAD, MVT::f16, Legal);

  for (MVT VT : {MVT::v2i16, MVT::v2f16, MVT::v4i16, MVT::v4f16}) {
    for (unsigned Op = 0; Op < ISD::BUILTIN_OP_END; ++Op) {
      switch (Op) {
      case ISD::LOAD:
      case ISD::STORE:
      case ISD::BUILD_VECTOR:
      case ISD::BITCAST:
      case ISD::EXTRACT_VECTOR_ELT:
      case ISD::INSERT_VECTOR_ELT:
      case ISD::INSERT_SUBVECTOR:
      case ISD::EXTRACT_SUBVECTOR:
      case ISD::SCALAR_TO_VECTOR:
        break;
      case ISD::CONCAT_VECTORS:
        setOperationAction(Op, VT, Custom);
        break;
      default:
        setOperationAction(Op, VT, Expand);
        break;
      }
    }
  }

  // v_perm_b32 can handle either of these.
  setOperationAction(ISD::BSWAP, MVT::i16, Legal);
  setOperationAction(ISD::BSWAP, MVT::v2i16, Legal);
  setOperationAction(ISD::BSWAP, MVT::v4i16, Custom);

  // XXX - Do these do anything? Vector constants turn into build_vector.
  setOperationAction(ISD::Constant, MVT::v2i16, Legal);
  setOperationAction(ISD::ConstantFP, MVT::v2f16, Legal);

  setOperationAction(ISD::UNDEF, MVT::v2i16, Legal);
  setOperationAction(ISD::UNDEF, MVT::v2f16, Legal);

  setOperationAction(ISD::STORE, MVT::v2i16, Promote);
  AddPromotedToType(ISD::STORE, MVT::v2i16, MVT::i32);
  setOperationAction(ISD::STORE, MVT::v2f16, Promote);
  AddPromotedToType(ISD::STORE, MVT::v2f16, MVT::i32);

  setOperationAction(ISD::LOAD, MVT::v2i16, Promote);
  AddPromotedToType(ISD::LOAD, MVT::v2i16, MVT::i32);
  setOperationAction(ISD::LOAD, MVT::v2f16, Promote);
  AddPromotedToType(ISD::LOAD, MVT::v2f16, MVT::i32);

  setOperationAction(ISD::AND, MVT::v2i16, Promote);
  AddPromotedToType(ISD::AND, MVT::v2i16, MVT::i32);
  setOperationAction(ISD::OR, MVT::v2i16, Promote);
  AddPromotedToType(ISD::OR, MVT::v2i16, MVT::i32);
  setOperationAction(ISD::XOR, MVT::v2i16, Promote);
  AddPromotedToType(ISD::XOR, MVT::v2i16, MVT::i32);

  setOperationAction(ISD::LOAD, MVT::v4i16, Promote);
  AddPromotedToType(ISD::LOAD, MVT::v4i16, MVT::v2i32);
  setOperationAction(ISD::LOAD, MVT::v4f16, Promote);
  AddPromotedToType(ISD::LOAD, MVT::v4f16, MVT::v2i32);

  setOperationAction(ISD::STORE, MVT::v4i16, Promote);
  AddPromotedToType(ISD::STORE, MVT::v4i16, MVT::v2i32);
  setOperationAction(ISD::STORE, MVT::v4f16, Promote);
  AddPromotedToType(ISD::STORE, MVT::v4f16, MVT::v2i32);

  setOperationAction(ISD::ANY_EXTEND, MVT::v2i32, Expand);
  setOperationAction(ISD::ZERO_EXTEND, MVT::v2i32, Expand);
  setOperationAction(ISD::SIGN_EXTEND, MVT::v2i32, Expand);
  setOperationAction(ISD::FP_EXTEND, MVT::v2f32, Expand);

  setOperationAction(ISD::ANY_EXTEND, MVT::v4i32, Expand);
  setOperationAction(ISD::ZERO_EXTEND, MVT::v4i32, Expand);
  setOperationAction(ISD::SIGN_EXTEND, MVT::v4i32, Expand);

  if (!Subtarget->hasVOP3PInsts()) {
    setOperationAction(ISD::BUILD_VECTOR, MVT::v2i16, Custom);
    setOperationAction(ISD::BUILD_VECTOR, MVT::v2f16, Custom);
  }

  setOperationAction(ISD::FNEG, MVT::v2f16, Legal);
  // This isn't really legal, but this avoids the legalizer unrolling it (and
  // allows matching fneg (fabs x) patterns)
  setOperationAction(ISD::FABS, MVT::v2f16, Legal);

  setOperationAction(ISD::FMAXNUM, MVT::f16, Custom);
  setOperationAction(ISD::FMINNUM, MVT::f16, Custom);
  setOperationAction(ISD::FMAXNUM_IEEE, MVT::f16, Legal);
  setOperationAction(ISD::FMINNUM_IEEE, MVT::f16, Legal);

  setOperationAction(ISD::FMINNUM_IEEE, MVT::v4f16, Custom);
  setOperationAction(ISD::FMAXNUM_IEEE, MVT::v4f16, Custom);

  setOperationAction(ISD::FMINNUM, MVT::v4f16, Expand);
  setOperationAction(ISD::FMAXNUM, MVT::v4f16, Expand);
}

if (Subtarget->hasVOP3PInsts()) {
  setOperationAction(ISD::ADD, MVT::v2i16, Legal);
  setOperationAction(ISD::SUB, MVT::v2i16, Legal);
  setOperationAction(ISD::MUL, MVT::v2i16, Legal);
  setOperationAction(ISD::SHL, MVT::v2i16, Legal);
  setOperationAction(ISD::SRL, MVT::v2i16, Legal);
  setOperationAction(ISD::SRA, MVT::v2i16, Legal);
  setOperationAction(ISD::SMIN, MVT::v2i16, Legal);
  setOperationAction(ISD::UMIN, MVT::v2i16, Legal);
  setOperationAction(ISD::SMAX, MVT::v2i16, Legal);
  setOperationAction(ISD::UMAX, MVT::v2i16, Legal);

  setOperationAction(ISD::UADDSAT, MVT::v2i16, Legal);
  setOperationAction(ISD::USUBSAT, MVT::v2i16, Legal);
  setOperationAction(ISD::SADDSAT, MVT::v2i16, Legal);
  setOperationAction(ISD::SSUBSAT, MVT::v2i16, Legal);

  setOperationAction(ISD::FADD, MVT::v2f16, Legal);
  setOperationAction(ISD::FMUL, MVT::v2f16, Legal);
  setOperationAction(ISD::FMA, MVT::v2f16, Legal);

  setOperationAction(ISD::FMINNUM_IEEE, MVT::v2f16, Legal);
  setOperationAction(ISD::FMAXNUM_IEEE, MVT::v2f16, Legal);

  setOperationAction(ISD::FCANONICALIZE, MVT::v2f16, Legal);

  setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i16, Custom);
  setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f16, Custom);

  setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v4f16, Custom);
  setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v4i16, Custom);

  setOperationAction(ISD::SHL, MVT::v4i16, Custom);
  setOperationAction(ISD::SRA, MVT::v4i16, Custom);
  setOperationAction(ISD::SRL, MVT::v4i16, Custom);
  setOperationAction(ISD::ADD, MVT::v4i16, Custom);
  setOperationAction(ISD::SUB, MVT::v4i16, Custom);
  setOperationAction(ISD::MUL, MVT::v4i16, Custom);

  setOperationAction(ISD::SMIN, MVT::v4i16, Custom);
  setOperationAction(ISD::SMAX, MVT::v4i16, Custom);
  setOperationAction(ISD::UMIN, MVT::v4i16, Custom);
  setOperationAction(ISD::UMAX, MVT::v4i16, Custom);

  setOperationAction(ISD::UADDSAT, MVT::v4i16, Custom);
  setOperationAction(ISD::SADDSAT, MVT::v4i16, Custom);
  setOperationAction(ISD::USUBSAT, MVT::v4i16, Custom);
  setOperationAction(ISD::SSUBSAT, MVT::v4i16, Custom);

  setOperationAction(ISD::FADD, MVT::v4f16, Custom);
  setOperationAction(ISD::FMUL, MVT::v4f16, Custom);
  setOperationAction(ISD::FMA, MVT::v4f16, Custom);

  setOperationAction(ISD::FMAXNUM, MVT::v2f16, Custom);
  setOperationAction(ISD::FMINNUM, MVT::v2f16, Custom);

  setOperationAction(ISD::FMINNUM, MVT::v4f16, Custom);
  setOperationAction(ISD::FMAXNUM, MVT::v4f16, Custom);
  setOperationAction(ISD::FCANONICALIZE, MVT::v4f16, Custom);

  setOperationAction(ISD::FEXP, MVT::v2f16, Custom);
  setOperationAction(ISD::SELECT, MVT::v4i16, Custom);
  setOperationAction(ISD::SELECT, MVT::v4f16, Custom);

  if (Subtarget->hasPackedFP32Ops()) {
    setOperationAction(ISD::FADD, MVT::v2f32, Legal);
    setOperationAction(ISD::FMUL, MVT::v2f32, Legal);
    setOperationAction(ISD::FMA,  MVT::v2f32, Legal);
    setOperationAction(ISD::FNEG, MVT::v2f32, Legal);

    for (MVT VT : { MVT::v4f32, MVT::v8f32, MVT::v16f32, MVT::v32f32 }) {
      setOperationAction(ISD::FADD, VT, Custom);
      setOperationAction(ISD::FMUL, VT, Custom);
      setOperationAction(ISD::FMA, VT, Custom);
    }
  }
}

setOperationAction(ISD::FNEG, MVT::v4f16, Custom);
setOperationAction(ISD::FABS, MVT::v4f16, Custom);

if (Subtarget->has16BitInsts()) {
  setOperationAction(ISD::SELECT, MVT::v2i16, Promote);
  AddPromotedToType(ISD::SELECT, MVT::v2i16, MVT::i32);
  setOperationAction(ISD::SELECT, MVT::v2f16, Promote);
  AddPromotedToType(ISD::SELECT, MVT::v2f16, MVT::i32);
} else {
  // Legalization hack.
  setOperationAction(ISD::SELECT, MVT::v2i16, Custom);
  setOperationAction(ISD::SELECT, MVT::v2f16, Custom);

  setOperationAction(ISD::FNEG, MVT::v2f16, Custom);
  setOperationAction(ISD::FABS, MVT::v2f16, Custom);
}

for (MVT VT : { MVT::v4i16, MVT::v4f16, MVT::v2i8, MVT::v4i8, MVT::v8i8 }) {
  setOperationAction(ISD::SELECT, VT, Custom);
}

setOperationAction(ISD::SMULO, MVT::i64, Custom);
setOperationAction(ISD::UMULO, MVT::i64, Custom);

setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::f32, Custom);
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::v4f32, Custom);
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::i16, Custom);
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::f16, Custom);
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::v2i16, Custom);
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::v2f16, Custom);

setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::v2f16, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::v2i16, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::v3f16, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::v3i16, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::v4f16, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::v4i16, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::v8f16, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::Other, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::f16, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::i16, Custom);
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::i8, Custom);

setOperationAction(ISD::INTRINSIC_VOID, MVT::Other, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::v2i16, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::v2f16, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::v3i16, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::v3f16, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::v4f16, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::v4i16, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::f16, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::i16, Custom);
setOperationAction(ISD::INTRINSIC_VOID, MVT::i8, Custom);

setTargetDAGCombine(ISD::ADD);
setTargetDAGCombine(ISD::ADDCARRY);
setTargetDAGCombine(ISD::SUB);
setTargetDAGCombine(ISD::SUBCARRY);
setTargetDAGCombine(ISD::FADD);
setTargetDAGCombine(ISD::FSUB);
setTargetDAGCombine(ISD::FMINNUM);
setTargetDAGCombine(ISD::FMAXNUM);
setTargetDAGCombine(ISD::FMINNUM_IEEE);
setTargetDAGCombine(ISD::FMAXNUM_IEEE);
setTargetDAGCombine(ISD::FMA);
setTargetDAGCombine(ISD::SMIN);
setTargetDAGCombine(ISD::SMAX);
setTargetDAGCombine(ISD::UMIN);
setTargetDAGCombine(ISD::UMAX);
setTargetDAGCombine(ISD::SETCC);
setTargetDAGCombine(ISD::AND);
setTargetDAGCombine(ISD::OR);
setTargetDAGCombine(ISD::XOR);
setTargetDAGCombine(ISD::SINT_TO_FP);
setTargetDAGCombine(ISD::UINT_TO_FP);
setTargetDAGCombine(ISD::FCANONICALIZE);
setTargetDAGCombine(ISD::SCALAR_TO_VECTOR);
setTargetDAGCombine(ISD::ZERO_EXTEND);
setTargetDAGCombine(ISD::SIGN_EXTEND_INREG);
setTargetDAGCombine(ISD::EXTRACT_VECTOR_ELT);
setTargetDAGCombine(ISD::INSERT_VECTOR_ELT);

// All memory operations. Some folding on the pointer operand is done to help
// matching the constant offsets in the addressing modes.
setTargetDAGCombine(ISD::LOAD);
setTargetDAGCombine(ISD::STORE);
setTargetDAGCombine(ISD::ATOMIC_LOAD);
setTargetDAGCombine(ISD::ATOMIC_STORE);
setTargetDAGCombine(ISD::ATOMIC_CMP_SWAP);
setTargetDAGCombine(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS);
setTargetDAGCombine(ISD::ATOMIC_SWAP);
setTargetDAGCombine(ISD::ATOMIC_LOAD_ADD);
setTargetDAGCombine(ISD::ATOMIC_LOAD_SUB);
setTargetDAGCombine(ISD::ATOMIC_LOAD_AND);
setTargetDAGCombine(ISD::ATOMIC_LOAD_OR);
setTargetDAGCombine(ISD::ATOMIC_LOAD_XOR);
setTargetDAGCombine(ISD::ATOMIC_LOAD_NAND);
setTargetDAGCombine(ISD::ATOMIC_LOAD_MIN);
setTargetDAGCombine(ISD::ATOMIC_LOAD_MAX);
setTargetDAGCombine(ISD::ATOMIC_LOAD_UMIN);
setTargetDAGCombine(ISD::ATOMIC_LOAD_UMAX);
setTargetDAGCombine(ISD::ATOMIC_LOAD_FADD);
setTargetDAGCombine(ISD::INTRINSIC_VOID);
setTargetDAGCombine(ISD::INTRINSIC_W_CHAIN);

// FIXME: In other contexts we pretend this is a per-function property.
setStackPointerRegisterToSaveRestore(AMDGPU::SGPR32);

setSchedulingPreference(Sched::RegPressure);
892}

894const GCNSubtarget *SITargetLowering::getSubtarget() const {
return Subtarget;
896}

898//===----------------------------------------------------------------------===//
899// TargetLowering queries
900//===----------------------------------------------------------------------===//

902// v_mad_mix* support a conversion from f16 to f32.
903//
904// There is only one special case when denormals are enabled we don't currently,
905// where this is OK to use.
906bool SITargetLowering::isFPExtFoldable(const SelectionDAG &DAG, unsigned Opcode,
                                     EVT DestVT, EVT SrcVT) const {
return ((Opcode == ISD::FMAD && Subtarget->hasMadMixInsts()) ||
        (Opcode == ISD::FMA && Subtarget->hasFmaMixInsts())) &&
  DestVT.getScalarType() == MVT::f32 &&
  SrcVT.getScalarType() == MVT::f16 &&
  // TODO: This probably only requires no input flushing?
  !hasFP32Denormals(DAG.getMachineFunction());
914}

916bool SITargetLowering::isShuffleMaskLegal(ArrayRef<int>, EVT) const {
// SI has some legal vector types, but no legal vector operations. Say no
// shuffles are legal in order to prefer scalarizing some vector operations.
return false;
920}

922MVT SITargetLowering::getRegisterTypeForCallingConv(LLVMContext &Context,
                                                  CallingConv::ID CC,
                                                  EVT VT) const {
if (CC == CallingConv::AMDGPU_KERNEL)
  return TargetLowering::getRegisterTypeForCallingConv(Context, CC, VT);

if (VT.isVector()) {
  EVT ScalarVT = VT.getScalarType();
  unsigned Size = ScalarVT.getSizeInBits();
  if (Size == 16) {
    if (Subtarget->has16BitInsts())
      return VT.isInteger() ? MVT::v2i16 : MVT::v2f16;
    return VT.isInteger() ? MVT::i32 : MVT::f32;
  }

  if (Size < 16)
    return Subtarget->has16BitInsts() ? MVT::i16 : MVT::i32;
  return Size == 32 ? ScalarVT.getSimpleVT() : MVT::i32;
}

if (VT.getSizeInBits() > 32)
  return MVT::i32;

return TargetLowering::getRegisterTypeForCallingConv(Context, CC, VT);
946}

948unsigned SITargetLowering::getNumRegistersForCallingConv(LLVMContext &Context,
                                                       CallingConv::ID CC,
                                                       EVT VT) const {
if (CC == CallingConv::AMDGPU_KERNEL)
  return TargetLowering::getNumRegistersForCallingConv(Context, CC, VT);

if (VT.isVector()) {
  unsigned NumElts = VT.getVectorNumElements();
  EVT ScalarVT = VT.getScalarType();
  unsigned Size = ScalarVT.getSizeInBits();

  // FIXME: Should probably promote 8-bit vectors to i16.
  if (Size == 16 && Subtarget->has16BitInsts())
    return (NumElts + 1) / 2;

  if (Size <= 32)
    return NumElts;

  if (Size > 32)
    return NumElts * ((Size + 31) / 32);
} else if (VT.getSizeInBits() > 32)
  return (VT.getSizeInBits() + 31) / 32;

return TargetLowering::getNumRegistersForCallingConv(Context, CC, VT);
972}

974unsigned SITargetLowering::getVectorTypeBreakdownForCallingConv(
LLVMContext &Context, CallingConv::ID CC,
EVT VT, EVT &IntermediateVT,
unsigned &NumIntermediates, MVT &RegisterVT) const {
if (CC != CallingConv::AMDGPU_KERNEL && VT.isVector()) {
  unsigned NumElts = VT.getVectorNumElements();
  EVT ScalarVT = VT.getScalarType();
  unsigned Size = ScalarVT.getSizeInBits();
  // FIXME: We should fix the ABI to be the same on targets without 16-bit
  // support, but unless we can properly handle 3-vectors, it will be still be
  // inconsistent.
  if (Size == 16 && Subtarget->has16BitInsts()) {
    RegisterVT = VT.isInteger() ? MVT::v2i16 : MVT::v2f16;
    IntermediateVT = RegisterVT;
    NumIntermediates = (NumElts + 1) / 2;
    return NumIntermediates;
  }

  if (Size == 32) {
    RegisterVT = ScalarVT.getSimpleVT();
    IntermediateVT = RegisterVT;
    NumIntermediates = NumElts;
    return NumIntermediates;
  }

  if (Size < 16 && Subtarget->has16BitInsts()) {
    // FIXME: Should probably form v2i16 pieces
    RegisterVT = MVT::i16;
    IntermediateVT = ScalarVT;
    NumIntermediates = NumElts;
    return NumIntermediates;
  }


  if (Size != 16 && Size <= 32) {
    RegisterVT = MVT::i32;
    IntermediateVT = ScalarVT;
    NumIntermediates = NumElts;
    return NumIntermediates;
  }

  if (Size > 32) {
    RegisterVT = MVT::i32;
    IntermediateVT = RegisterVT;
    NumIntermediates = NumElts * ((Size + 31) / 32);
    return NumIntermediates;
  }
}

return TargetLowering::getVectorTypeBreakdownForCallingConv(
  Context, CC, VT, IntermediateVT, NumIntermediates, RegisterVT);
1025}

1027static EVT memVTFromImageData(Type *Ty, unsigned DMaskLanes) {
assert(DMaskLanes != 0)((void)0);

if (auto *VT = dyn_cast<FixedVectorType>(Ty)) {
  unsigned NumElts = std::min(DMaskLanes, VT->getNumElements());
  return EVT::getVectorVT(Ty->getContext(),
                          EVT::getEVT(VT->getElementType()),
                          NumElts);
}

return EVT::getEVT(Ty);
1038}

1040// Peek through TFE struct returns to only use the data size.
1041static EVT memVTFromImageReturn(Type *Ty, unsigned DMaskLanes) {
auto *ST = dyn_cast<StructType>(Ty);
if (!ST)
  return memVTFromImageData(Ty, DMaskLanes);

// Some intrinsics return an aggregate type - special case to work out the
// correct memVT.
//
// Only limited forms of aggregate type currently expected.
if (ST->getNumContainedTypes() != 2 ||
    !ST->getContainedType(1)->isIntegerTy(32))
  return EVT();
return memVTFromImageData(ST->getContainedType(0), DMaskLanes);
1054}

1056bool SITargetLowering::getTgtMemIntrinsic(IntrinsicInfo &Info,
                                        const CallInst &CI,
                                        MachineFunction &MF,
                                        unsigned IntrID) const {
if (const AMDGPU::RsrcIntrinsic *RsrcIntr =
        AMDGPU::lookupRsrcIntrinsic(IntrID)) {
  AttributeList Attr = Intrinsic::getAttributes(CI.getContext(),
                                                (Intrinsic::ID)IntrID);
  if (Attr.hasFnAttribute(Attribute::ReadNone))
    return false;

  SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();

  if (RsrcIntr->IsImage) {
    Info.ptrVal =
        MFI->getImagePSV(*MF.getSubtarget<GCNSubtarget>().getInstrInfo());
    Info.align.reset();
  } else {
    Info.ptrVal =
        MFI->getBufferPSV(*MF.getSubtarget<GCNSubtarget>().getInstrInfo());
  }

  Info.flags = MachineMemOperand::MODereferenceable;
  if (Attr.hasFnAttribute(Attribute::ReadOnly)) {
    unsigned DMaskLanes = 4;

    if (RsrcIntr->IsImage) {
      const AMDGPU::ImageDimIntrinsicInfo *Intr
        = AMDGPU::getImageDimIntrinsicInfo(IntrID);
      const AMDGPU::MIMGBaseOpcodeInfo *BaseOpcode =
        AMDGPU::getMIMGBaseOpcodeInfo(Intr->BaseOpcode);

      if (!BaseOpcode->Gather4) {
        // If this isn't a gather, we may have excess loaded elements in the
        // IR type. Check the dmask for the real number of elements loaded.
        unsigned DMask
          = cast<ConstantInt>(CI.getArgOperand(0))->getZExtValue();
        DMaskLanes = DMask == 0 ? 1 : countPopulation(DMask);
      }

      Info.memVT = memVTFromImageReturn(CI.getType(), DMaskLanes);
    } else
      Info.memVT = EVT::getEVT(CI.getType());

    // FIXME: What does alignment mean for an image?
    Info.opc = ISD::INTRINSIC_W_CHAIN;
    Info.flags |= MachineMemOperand::MOLoad;
  } else if (Attr.hasFnAttribute(Attribute::WriteOnly)) {
    Info.opc = ISD::INTRINSIC_VOID;

    Type *DataTy = CI.getArgOperand(0)->getType();
    if (RsrcIntr->IsImage) {
      unsigned DMask = cast<ConstantInt>(CI.getArgOperand(1))->getZExtValue();
      unsigned DMaskLanes = DMask == 0 ? 1 : countPopulation(DMask);
      Info.memVT = memVTFromImageData(DataTy, DMaskLanes);
    } else
      Info.memVT = EVT::getEVT(DataTy);

    Info.flags |= MachineMemOperand::MOStore;
  } else {
    // Atomic
    Info.opc = CI.getType()->isVoidTy() ? ISD::INTRINSIC_VOID :
                                          ISD::INTRINSIC_W_CHAIN;
    Info.memVT = MVT::getVT(CI.getArgOperand(0)->getType());
    Info.flags = MachineMemOperand::MOLoad |
                 MachineMemOperand::MOStore |
                 MachineMemOperand::MODereferenceable;

    // XXX - Should this be volatile without known ordering?
    Info.flags |= MachineMemOperand::MOVolatile;
  }
  return true;
}

switch (IntrID) {
case Intrinsic::amdgcn_atomic_inc:
case Intrinsic::amdgcn_atomic_dec:
case Intrinsic::amdgcn_ds_ordered_add:
case Intrinsic::amdgcn_ds_ordered_swap:
case Intrinsic::amdgcn_ds_fadd:
case Intrinsic::amdgcn_ds_fmin:
case Intrinsic::amdgcn_ds_fmax: {
  Info.opc = ISD::INTRINSIC_W_CHAIN;
  Info.memVT = MVT::getVT(CI.getType());
  Info.ptrVal = CI.getOperand(0);
  Info.align.reset();
  Info.flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;

  const ConstantInt *Vol = cast<ConstantInt>(CI.getOperand(4));
  if (!Vol->isZero())
    Info.flags |= MachineMemOperand::MOVolatile;

  return true;
}
case Intrinsic::amdgcn_buffer_atomic_fadd: {
  SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();

  Info.opc = ISD::INTRINSIC_W_CHAIN;
  Info.memVT = MVT::getVT(CI.getOperand(0)->getType());
  Info.ptrVal =
      MFI->getBufferPSV(*MF.getSubtarget<GCNSubtarget>().getInstrInfo());
  Info.align.reset();
  Info.flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;

  const ConstantInt *Vol = dyn_cast<ConstantInt>(CI.getOperand(4));
  if (!Vol || !Vol->isZero())
    Info.flags |= MachineMemOperand::MOVolatile;

  return true;
}
case Intrinsic::amdgcn_ds_append:
case Intrinsic::amdgcn_ds_consume: {
  Info.opc = ISD::INTRINSIC_W_CHAIN;
  Info.memVT = MVT::getVT(CI.getType());
  Info.ptrVal = CI.getOperand(0);
  Info.align.reset();
  Info.flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;

  const ConstantInt *Vol = cast<ConstantInt>(CI.getOperand(1));
  if (!Vol->isZero())
    Info.flags |= MachineMemOperand::MOVolatile;

  return true;
}
case Intrinsic::amdgcn_global_atomic_csub: {
  Info.opc = ISD::INTRINSIC_W_CHAIN;
  Info.memVT = MVT::getVT(CI.getType());
  Info.ptrVal = CI.getOperand(0);
  Info.align.reset();
  Info.flags = MachineMemOperand::MOLoad |
               MachineMemOperand::MOStore |
               MachineMemOperand::MOVolatile;
  return true;
}
case Intrinsic::amdgcn_image_bvh_intersect_ray: {
  SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
  Info.opc = ISD::INTRINSIC_W_CHAIN;
  Info.memVT = MVT::getVT(CI.getType()); // XXX: what is correct VT?
  Info.ptrVal =
      MFI->getImagePSV(*MF.getSubtarget<GCNSubtarget>().getInstrInfo());
  Info.align.reset();
  Info.flags = MachineMemOperand::MOLoad |
               MachineMemOperand::MODereferenceable;
  return true;
}
case Intrinsic::amdgcn_global_atomic_fadd:
case Intrinsic::amdgcn_global_atomic_fmin:
case Intrinsic::amdgcn_global_atomic_fmax:
case Intrinsic::amdgcn_flat_atomic_fadd:
case Intrinsic::amdgcn_flat_atomic_fmin:
case Intrinsic::amdgcn_flat_atomic_fmax: {
  Info.opc = ISD::INTRINSIC_W_CHAIN;
  Info.memVT = MVT::getVT(CI.getType());
  Info.ptrVal = CI.getOperand(0);
  Info.align.reset();
  Info.flags = MachineMemOperand::MOLoad |
               MachineMemOperand::MOStore |
               MachineMemOperand::MODereferenceable |
               MachineMemOperand::MOVolatile;
  return true;
}
case Intrinsic::amdgcn_ds_gws_init:
case Intrinsic::amdgcn_ds_gws_barrier:
case Intrinsic::amdgcn_ds_gws_sema_v:
case Intrinsic::amdgcn_ds_gws_sema_br:
case Intrinsic::amdgcn_ds_gws_sema_p:
case Intrinsic::amdgcn_ds_gws_sema_release_all: {
  Info.opc = ISD::INTRINSIC_VOID;

  SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
  Info.ptrVal =
      MFI->getGWSPSV(*MF.getSubtarget<GCNSubtarget>().getInstrInfo());

  // This is an abstract access, but we need to specify a type and size.
  Info.memVT = MVT::i32;
  Info.size = 4;
  Info.align = Align(4);

  Info.flags = MachineMemOperand::MOStore;
  if (IntrID == Intrinsic::amdgcn_ds_gws_barrier)
    Info.flags = MachineMemOperand::MOLoad;
  return true;
}
default:
  return false;
}
1242}

1244bool SITargetLowering::getAddrModeArguments(IntrinsicInst *II,
                                          SmallVectorImpl<Value*> &Ops,
                                          Type *&AccessTy) const {
switch (II->getIntrinsicID()) {
case Intrinsic::amdgcn_atomic_inc:
case Intrinsic::amdgcn_atomic_dec:
case Intrinsic::amdgcn_ds_ordered_add:
case Intrinsic::amdgcn_ds_ordered_swap:
case Intrinsic::amdgcn_ds_append:
case Intrinsic::amdgcn_ds_consume:
case Intrinsic::amdgcn_ds_fadd:
case Intrinsic::amdgcn_ds_fmin:
case Intrinsic::amdgcn_ds_fmax:
case Intrinsic::amdgcn_global_atomic_fadd:
case Intrinsic::amdgcn_flat_atomic_fadd:
case Intrinsic::amdgcn_flat_atomic_fmin:
case Intrinsic::amdgcn_flat_atomic_fmax:
case Intrinsic::amdgcn_global_atomic_csub: {
  Value *Ptr = II->getArgOperand(0);
  AccessTy = II->getType();
  Ops.push_back(Ptr);
  return true;
}
default:
  return false;
}
1270}

1272bool SITargetLowering::isLegalFlatAddressingMode(const AddrMode &AM) const {
if (!Subtarget->hasFlatInstOffsets()) {
  // Flat instructions do not have offsets, and only have the register
  // address.
  return AM.BaseOffs == 0 && AM.Scale == 0;
}

return AM.Scale == 0 &&
       (AM.BaseOffs == 0 ||
        Subtarget->getInstrInfo()->isLegalFLATOffset(
            AM.BaseOffs, AMDGPUAS::FLAT_ADDRESS, SIInstrFlags::FLAT));
1283}

1285bool SITargetLowering::isLegalGlobalAddressingMode(const AddrMode &AM) const {
if (Subtarget->hasFlatGlobalInsts())
  return AM.Scale == 0 &&
         (AM.BaseOffs == 0 || Subtarget->getInstrInfo()->isLegalFLATOffset(
                                  AM.BaseOffs, AMDGPUAS::GLOBAL_ADDRESS,
                                  SIInstrFlags::FlatGlobal));

if (!Subtarget->hasAddr64() || Subtarget->useFlatForGlobal()) {
    // Assume the we will use FLAT for all global memory accesses
    // on VI.
    // FIXME: This assumption is currently wrong.  On VI we still use
    // MUBUF instructions for the r + i addressing mode.  As currently
    // implemented, the MUBUF instructions only work on buffer < 4GB.
    // It may be possible to support > 4GB buffers with MUBUF instructions,
    // by setting the stride value in the resource descriptor which would
    // increase the size limit to (stride * 4GB).  However, this is risky,
    // because it has never been validated.
  return isLegalFlatAddressingMode(AM);
}

return isLegalMUBUFAddressingMode(AM);
1306}

1308bool SITargetLowering::isLegalMUBUFAddressingMode(const AddrMode &AM) const {
// MUBUF / MTBUF instructions have a 12-bit unsigned byte offset, and
// additionally can do r + r + i with addr64. 32-bit has more addressing
// mode options. Depending on the resource constant, it can also do
// (i64 r0) + (i32 r1) * (i14 i).
//
// Private arrays end up using a scratch buffer most of the time, so also
// assume those use MUBUF instructions. Scratch loads / stores are currently
// implemented as mubuf instructions with offen bit set, so slightly
// different than the normal addr64.
if (!SIInstrInfo::isLegalMUBUFImmOffset(AM.BaseOffs))
  return false;

// FIXME: Since we can split immediate into soffset and immediate offset,
// would it make sense to allow any immediate?

switch (AM.Scale) {
case 0: // r + i or just i, depending on HasBaseReg.
  return true;
case 1:
  return true; // We have r + r or r + i.
case 2:
  if (AM.HasBaseReg) {
    // Reject 2 * r + r.
    return false;
  }

  // Allow 2 * r as r + r
  // Or  2 * r + i is allowed as r + r + i.
  return true;
default: // Don't allow n * r
  return false;
}
1341}

1343bool SITargetLowering::isLegalAddressingMode(const DataLayout &DL,
                                           const AddrMode &AM, Type *Ty,
                                           unsigned AS, Instruction *I) const {
// No global is ever allowed as a base.
if (AM.BaseGV)
  return false;

if (AS == AMDGPUAS::GLOBAL_ADDRESS)
  return isLegalGlobalAddressingMode(AM);

if (AS == AMDGPUAS::CONSTANT_ADDRESS ||
    AS == AMDGPUAS::CONSTANT_ADDRESS_32BIT ||
    AS == AMDGPUAS::BUFFER_FAT_POINTER) {
  // If the offset isn't a multiple of 4, it probably isn't going to be
  // correctly aligned.
  // FIXME: Can we get the real alignment here?
  if (AM.BaseOffs % 4 != 0)
    return isLegalMUBUFAddressingMode(AM);

  // There are no SMRD extloads, so if we have to do a small type access we
  // will use a MUBUF load.
  // FIXME?: We also need to do this if unaligned, but we don't know the
  // alignment here.
  if (Ty->isSized() && DL.getTypeStoreSize(Ty) < 4)
    return isLegalGlobalAddressingMode(AM);

  if (Subtarget->getGeneration() == AMDGPUSubtarget::SOUTHERN_ISLANDS) {
    // SMRD instructions have an 8-bit, dword offset on SI.
    if (!isUInt<8>(AM.BaseOffs / 4))
      return false;
  } else if (Subtarget->getGeneration() == AMDGPUSubtarget::SEA_ISLANDS) {
    // On CI+, this can also be a 32-bit literal constant offset. If it fits
    // in 8-bits, it can use a smaller encoding.
    if (!isUInt<32>(AM.BaseOffs / 4))
      return false;
  } else if (Subtarget->getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) {
    // On VI, these use the SMEM format and the offset is 20-bit in bytes.
    if (!isUInt<20>(AM.BaseOffs))
      return false;
  } else
    llvm_unreachable("unhandled generation")__builtin_unreachable();

  if (AM.Scale == 0) // r + i or just i, depending on HasBaseReg.
    return true;

  if (AM.Scale == 1 && AM.HasBaseReg)
    return true;

  return false;

} else if (AS == AMDGPUAS::PRIVATE_ADDRESS) {
  return isLegalMUBUFAddressingMode(AM);
} else if (AS == AMDGPUAS::LOCAL_ADDRESS ||
           AS == AMDGPUAS::REGION_ADDRESS) {
  // Basic, single offset DS instructions allow a 16-bit unsigned immediate
  // field.
  // XXX - If doing a 4-byte aligned 8-byte type access, we effectively have
  // an 8-bit dword offset but we don't know the alignment here.
  if (!isUInt<16>(AM.BaseOffs))
    return false;

  if (AM.Scale == 0) // r + i or just i, depending on HasBaseReg.
    return true;

  if (AM.Scale == 1 && AM.HasBaseReg)
    return true;

  return false;
} else if (AS == AMDGPUAS::FLAT_ADDRESS ||
           AS == AMDGPUAS::UNKNOWN_ADDRESS_SPACE) {
  // For an unknown address space, this usually means that this is for some
  // reason being used for pure arithmetic, and not based on some addressing
  // computation. We don't have instructions that compute pointers with any
  // addressing modes, so treat them as having no offset like flat
  // instructions.
  return isLegalFlatAddressingMode(AM);
}

// Assume a user alias of global for unknown address spaces.
return isLegalGlobalAddressingMode(AM);
1423}

1425bool SITargetLowering::canMergeStoresTo(unsigned AS, EVT MemVT,
                                      const SelectionDAG &DAG) const {
if (AS == AMDGPUAS::GLOBAL_ADDRESS || AS == AMDGPUAS::FLAT_ADDRESS) {
  return (MemVT.getSizeInBits() <= 4 * 32);
} else if (AS == AMDGPUAS::PRIVATE_ADDRESS) {
  unsigned MaxPrivateBits = 8 * getSubtarget()->getMaxPrivateElementSize();
  return (MemVT.getSizeInBits() <= MaxPrivateBits);
} else if (AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::REGION_ADDRESS) {
  return (MemVT.getSizeInBits() <= 2 * 32);
}
return true;
1436}

1438bool SITargetLowering::allowsMisalignedMemoryAccessesImpl(
  unsigned Size, unsigned AddrSpace, Align Alignment,
  MachineMemOperand::Flags Flags, bool *IsFast) const {
if (IsFast)
  *IsFast = false;

if (AddrSpace == AMDGPUAS::LOCAL_ADDRESS ||
    AddrSpace == AMDGPUAS::REGION_ADDRESS) {
  // Check if alignment requirements for ds_read/write instructions are
  // disabled.
  if (Subtarget->hasUnalignedDSAccessEnabled() &&
      !Subtarget->hasLDSMisalignedBug()) {
    if (IsFast)
      *IsFast = Alignment != Align(2);
    return true;
  }

  // Either, the alignment requirements are "enabled", or there is an
  // unaligned LDS access related hardware bug though alignment requirements
  // are "disabled". In either case, we need to check for proper alignment
  // requirements.
  //
  if (Size == 64) {
    // 8 byte accessing via ds_read/write_b64 require 8-byte alignment, but we
    // can do a 4 byte aligned, 8 byte access in a single operation using
    // ds_read2/write2_b32 with adjacent offsets.
    bool AlignedBy4 = Alignment >= Align(4);
    if (IsFast)
      *IsFast = AlignedBy4;

    return AlignedBy4;
  }
  if (Size == 96) {
    // 12 byte accessing via ds_read/write_b96 require 16-byte alignment on
    // gfx8 and older.
    bool AlignedBy16 = Alignment >= Align(16);
    if (IsFast)
      *IsFast = AlignedBy16;

    return AlignedBy16;
  }
  if (Size == 128) {
    // 16 byte accessing via ds_read/write_b128 require 16-byte alignment on
    // gfx8 and older, but  we can do a 8 byte aligned, 16 byte access in a
    // single operation using ds_read2/write2_b64.
    bool AlignedBy8 = Alignment >= Align(8);
    if (IsFast)
      *IsFast = AlignedBy8;

    return AlignedBy8;
  }
}

if (AddrSpace == AMDGPUAS::PRIVATE_ADDRESS) {
  bool AlignedBy4 = Alignment >= Align(4);
  if (IsFast)
    *IsFast = AlignedBy4;

  return AlignedBy4 ||
         Subtarget->enableFlatScratch() ||
         Subtarget->hasUnalignedScratchAccess();
}

// FIXME: We have to be conservative here and assume that flat operations
// will access scratch.  If we had access to the IR function, then we
// could determine if any private memory was used in the function.
if (AddrSpace == AMDGPUAS::FLAT_ADDRESS &&
    !Subtarget->hasUnalignedScratchAccess()) {
  bool AlignedBy4 = Alignment >= Align(4);
  if (IsFast)
    *IsFast = AlignedBy4;

  return AlignedBy4;
}

if (Subtarget->hasUnalignedBufferAccessEnabled() &&
    !(AddrSpace == AMDGPUAS::LOCAL_ADDRESS ||
      AddrSpace == AMDGPUAS::REGION_ADDRESS)) {
  // If we have an uniform constant load, it still requires using a slow
  // buffer instruction if unaligned.
  if (IsFast) {
    // Accesses can really be issued as 1-byte aligned or 4-byte aligned, so
    // 2-byte alignment is worse than 1 unless doing a 2-byte accesss.
    *IsFast = (AddrSpace == AMDGPUAS::CONSTANT_ADDRESS ||
               AddrSpace == AMDGPUAS::CONSTANT_ADDRESS_32BIT) ?
      Alignment >= Align(4) : Alignment != Align(2);
  }

  return true;
}

// Smaller than dword value must be aligned.
if (Size < 32)
  return false;

// 8.1.6 - For Dword or larger reads or writes, the two LSBs of the
// byte-address are ignored, thus forcing Dword alignment.
// This applies to private, global, and constant memory.
if (IsFast)
  *IsFast = true;

return Size >= 32 && Alignment >= Align(4);
1540}

1542bool SITargetLowering::allowsMisalignedMemoryAccesses(
  EVT VT, unsigned AddrSpace, Align Alignment, MachineMemOperand::Flags Flags,
  bool *IsFast) const {
if (IsFast)
  *IsFast = false;

// TODO: I think v3i32 should allow unaligned accesses on CI with DS_READ_B96,
// which isn't a simple VT.
// Until MVT is extended to handle this, simply check for the size and
// rely on the condition below: allow accesses if the size is a multiple of 4.
if (VT == MVT::Other || (VT != MVT::Other && VT.getSizeInBits() > 1024 &&
                         VT.getStoreSize() > 16)) {
  return false;
}

return allowsMisalignedMemoryAccessesImpl(VT.getSizeInBits(), AddrSpace,
                                          Alignment, Flags, IsFast);
1559}

1561EVT SITargetLowering::getOptimalMemOpType(
  const MemOp &Op, const AttributeList &FuncAttributes) const {
// FIXME: Should account for address space here.

// The default fallback uses the private pointer size as a guess for a type to
// use. Make sure we switch these to 64-bit accesses.

if (Op.size() >= 16 &&
    Op.isDstAligned(Align(4))) // XXX: Should only do for global
  return MVT::v4i32;

if (Op.size() >= 8 && Op.isDstAligned(Align(4)))
  return MVT::v2i32;

// Use the default.
return MVT::Other;
1577}

1579bool SITargetLowering::isMemOpHasNoClobberedMemOperand(const SDNode *N) const {
const MemSDNode *MemNode = cast<MemSDNode>(N);
const Value *Ptr = MemNode->getMemOperand()->getValue();
const Instruction *I = dyn_cast_or_null<Instruction>(Ptr);
return I && I->getMetadata("amdgpu.noclobber");
1584}

1586bool SITargetLowering::isNonGlobalAddrSpace(unsigned AS) {
return AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::REGION_ADDRESS ||
       AS == AMDGPUAS::PRIVATE_ADDRESS;
1589}

1591bool SITargetLowering::isFreeAddrSpaceCast(unsigned SrcAS,
                                         unsigned DestAS) const {
// Flat -> private/local is a simple truncate.
// Flat -> global is no-op
if (SrcAS == AMDGPUAS::FLAT_ADDRESS)
  return true;

const GCNTargetMachine &TM =
    static_cast<const GCNTargetMachine &>(getTargetMachine());
return TM.isNoopAddrSpaceCast(SrcAS, DestAS);
1601}

1603bool SITargetLowering::isMemOpUniform(const SDNode *N) const {
const MemSDNode *MemNode = cast<MemSDNode>(N);

return AMDGPUInstrInfo::isUniformMMO(MemNode->getMemOperand());
1607}

1609TargetLoweringBase::LegalizeTypeAction
1610SITargetLowering::getPreferredVectorAction(MVT VT) const {
if (!VT.isScalableVector() && VT.getVectorNumElements() != 1 &&
    VT.getScalarType().bitsLE(MVT::i16))
  return VT.isPow2VectorType() ? TypeSplitVector : TypeWidenVector;
return TargetLoweringBase::getPreferredVectorAction(VT);
1615}

1617bool SITargetLowering::shouldConvertConstantLoadToIntImm(const APInt &Imm,
                                                       Type *Ty) const {
// FIXME: Could be smarter if called for vector constants.
return true;
1621}

1623bool SITargetLowering::isTypeDesirableForOp(unsigned Op, EVT VT) const {
if (Subtarget->has16BitInsts() && VT == MVT::i16) {
  switch (Op) {
  case ISD::LOAD:
  case ISD::STORE:

  // These operations are done with 32-bit instructions anyway.
  case ISD::AND:
  case ISD::OR:
  case ISD::XOR:
  case ISD::SELECT:
    // TODO: Extensions?
    return true;
  default:
    return false;
  }
}

// SimplifySetCC uses this function to determine whether or not it should
// create setcc with i1 operands.  We don't have instructions for i1 setcc.
if (VT == MVT::i1 && Op == ISD::SETCC)
  return false;

return TargetLowering::isTypeDesirableForOp(Op, VT);
1647}

1649SDValue SITargetLowering::lowerKernArgParameterPtr(SelectionDAG &DAG,
                                                 const SDLoc &SL,
                                                 SDValue Chain,
                                                 uint64_t Offset) const {
const DataLayout &DL = DAG.getDataLayout();
MachineFunction &MF = DAG.getMachineFunction();
const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();

const ArgDescriptor *InputPtrReg;
const TargetRegisterClass *RC;
LLT ArgTy;

std::tie(InputPtrReg, RC, ArgTy) =
    Info->getPreloadedValue(AMDGPUFunctionArgInfo::KERNARG_SEGMENT_PTR);

MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
MVT PtrVT = getPointerTy(DL, AMDGPUAS::CONSTANT_ADDRESS);
SDValue BasePtr = DAG.getCopyFromReg(Chain, SL,
  MRI.getLiveInVirtReg(InputPtrReg->getRegister()), PtrVT);

return DAG.getObjectPtrOffset(SL, BasePtr, TypeSize::Fixed(Offset));
1670}

1672SDValue SITargetLowering::getImplicitArgPtr(SelectionDAG &DAG,
                                          const SDLoc &SL) const {
uint64_t Offset = getImplicitParameterOffset(DAG.getMachineFunction(),
                                             FIRST_IMPLICIT);
return lowerKernArgParameterPtr(DAG, SL, DAG.getEntryNode(), Offset);
1677}

1679SDValue SITargetLowering::convertArgType(SelectionDAG &DAG, EVT VT, EVT MemVT,
                                       const SDLoc &SL, SDValue Val,
                                       bool Signed,
                                       const ISD::InputArg *Arg) const {
// First, if it is a widened vector, narrow it.
if (VT.isVector() &&
    VT.getVectorNumElements() != MemVT.getVectorNumElements()) {
  EVT NarrowedVT =
      EVT::getVectorVT(*DAG.getContext(), MemVT.getVectorElementType(),
                       VT.getVectorNumElements());
  Val = DAG.getNode(ISD::EXTRACT_SUBVECTOR, SL, NarrowedVT, Val,
                    DAG.getConstant(0, SL, MVT::i32));
}

// Then convert the vector elements or scalar value.
if (Arg && (Arg->Flags.isSExt() || Arg->Flags.isZExt()) &&
    VT.bitsLT(MemVT)) {
  unsigned Opc = Arg->Flags.isZExt() ? ISD::AssertZext : ISD::AssertSext;
  Val = DAG.getNode(Opc, SL, MemVT, Val, DAG.getValueType(VT));
}

if (MemVT.isFloatingPoint())
  Val = getFPExtOrFPRound(DAG, Val, SL, VT);
else if (Signed)
  Val = DAG.getSExtOrTrunc(Val, SL, VT);
else
  Val = DAG.getZExtOrTrunc(Val, SL, VT);

return Val;
1708}

1710SDValue SITargetLowering::lowerKernargMemParameter(
  SelectionDAG &DAG, EVT VT, EVT MemVT, const SDLoc &SL, SDValue Chain,
  uint64_t Offset, Align Alignment, bool Signed,
  const ISD::InputArg *Arg) const {
MachinePointerInfo PtrInfo(AMDGPUAS::CONSTANT_ADDRESS);

// Try to avoid using an extload by loading earlier than the argument address,
// and extracting the relevant bits. The load should hopefully be merged with
// the previous argument.
if (MemVT.getStoreSize() < 4 && Alignment < 4) {
  // TODO: Handle align < 4 and size >= 4 (can happen with packed structs).
  int64_t AlignDownOffset = alignDown(Offset, 4);
  int64_t OffsetDiff = Offset - AlignDownOffset;

  EVT IntVT = MemVT.changeTypeToInteger();

  // TODO: If we passed in the base kernel offset we could have a better
  // alignment than 4, but we don't really need it.
  SDValue Ptr = lowerKernArgParameterPtr(DAG, SL, Chain, AlignDownOffset);
  SDValue Load = DAG.getLoad(MVT::i32, SL, Chain, Ptr, PtrInfo, Align(4),
                             MachineMemOperand::MODereferenceable |
                                 MachineMemOperand::MOInvariant);

  SDValue ShiftAmt = DAG.getConstant(OffsetDiff * 8, SL, MVT::i32);
  SDValue Extract = DAG.getNode(ISD::SRL, SL, MVT::i32, Load, ShiftAmt);

  SDValue ArgVal = DAG.getNode(ISD::TRUNCATE, SL, IntVT, Extract);
  ArgVal = DAG.getNode(ISD::BITCAST, SL, MemVT, ArgVal);
  ArgVal = convertArgType(DAG, VT, MemVT, SL, ArgVal, Signed, Arg);


  return DAG.getMergeValues({ ArgVal, Load.getValue(1) }, SL);
}

SDValue Ptr = lowerKernArgParameterPtr(DAG, SL, Chain, Offset);
SDValue Load = DAG.getLoad(MemVT, SL, Chain, Ptr, PtrInfo, Alignment,
                           MachineMemOperand::MODereferenceable |
                               MachineMemOperand::MOInvariant);

SDValue Val = convertArgType(DAG, VT, MemVT, SL, Load, Signed, Arg);
return DAG.getMergeValues({ Val, Load.getValue(1) }, SL);
1751}

1753SDValue SITargetLowering::lowerStackParameter(SelectionDAG &DAG, CCValAssign &VA,
                                            const SDLoc &SL, SDValue Chain,
                                            const ISD::InputArg &Arg) const {
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo &MFI = MF.getFrameInfo();

if (Arg.Flags.isByVal()) {
  unsigned Size = Arg.Flags.getByValSize();
  int FrameIdx = MFI.CreateFixedObject(Size, VA.getLocMemOffset(), false);
  return DAG.getFrameIndex(FrameIdx, MVT::i32);
}

unsigned ArgOffset = VA.getLocMemOffset();
unsigned ArgSize = VA.getValVT().getStoreSize();

int FI = MFI.CreateFixedObject(ArgSize, ArgOffset, true);

// Create load nodes to retrieve arguments from the stack.
SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
SDValue ArgValue;

// For NON_EXTLOAD, generic code in getLoad assert(ValVT == MemVT)
ISD::LoadExtType ExtType = ISD::NON_EXTLOAD;
MVT MemVT = VA.getValVT();

switch (VA.getLocInfo()) {
default:
  break;
case CCValAssign::BCvt:
  MemVT = VA.getLocVT();
  break;
case CCValAssign::SExt:
  ExtType = ISD::SEXTLOAD;
  break;
case CCValAssign::ZExt:
  ExtType = ISD::ZEXTLOAD;
  break;
case CCValAssign::AExt:
  ExtType = ISD::EXTLOAD;
  break;
}

ArgValue = DAG.getExtLoad(
  ExtType, SL, VA.getLocVT(), Chain, FIN,
  MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI),
  MemVT);
return ArgValue;
1800}

1802SDValue SITargetLowering::getPreloadedValue(SelectionDAG &DAG,
const SIMachineFunctionInfo &MFI,
EVT VT,
AMDGPUFunctionArgInfo::PreloadedValue PVID) const {
const ArgDescriptor *Reg;
const TargetRegisterClass *RC;
LLT Ty;

std::tie(Reg, RC, Ty) = MFI.getPreloadedValue(PVID);
return CreateLiveInRegister(DAG, RC, Reg->getRegister(), VT);
1812}

1814static void processPSInputArgs(SmallVectorImpl<ISD::InputArg> &Splits,
                             CallingConv::ID CallConv,
                             ArrayRef<ISD::InputArg> Ins, BitVector &Skipped,
                             FunctionType *FType,
                             SIMachineFunctionInfo *Info) {
for (unsigned I = 0, E = Ins.size(), PSInputNum = 0; I != E; ++I) {
  const ISD::InputArg *Arg = &Ins[I];

  assert((!Arg->VT.isVector() || Arg->VT.getScalarSizeInBits() == 16) &&((void)0)
         "vector type argument should have been split")((void)0);

  // First check if it's a PS input addr.
  if (CallConv == CallingConv::AMDGPU_PS &&
      !Arg->Flags.isInReg() && PSInputNum <= 15) {
    bool SkipArg = !Arg->Used && !Info->isPSInputAllocated(PSInputNum);

    // Inconveniently only the first part of the split is marked as isSplit,
    // so skip to the end. We only want to increment PSInputNum once for the
    // entire split argument.
    if (Arg->Flags.isSplit()) {
      while (!Arg->Flags.isSplitEnd()) {
        assert((!Arg->VT.isVector() ||((void)0)
                Arg->VT.getScalarSizeInBits() == 16) &&((void)0)
               "unexpected vector split in ps argument type")((void)0);
        if (!SkipArg)
          Splits.push_back(*Arg);
        Arg = &Ins[++I];
      }
    }

    if (SkipArg) {
      // We can safely skip PS inputs.
      Skipped.set(Arg->getOrigArgIndex());
      ++PSInputNum;
      continue;
    }

    Info->markPSInputAllocated(PSInputNum);
    if (Arg->Used)
      Info->markPSInputEnabled(PSInputNum);

    ++PSInputNum;
  }

  Splits.push_back(*Arg);
}
1860}

1862// Allocate special inputs passed in VGPRs.
1863void SITargetLowering::allocateSpecialEntryInputVGPRs(CCState &CCInfo,
                                                    MachineFunction &MF,
                                                    const SIRegisterInfo &TRI,
                                                    SIMachineFunctionInfo &Info) const {
const LLT S32 = LLT::scalar(32);
MachineRegisterInfo &MRI = MF.getRegInfo();

if (Info.hasWorkItemIDX()) {
  Register Reg = AMDGPU::VGPR0;
  MRI.setType(MF.addLiveIn(Reg, &AMDGPU::VGPR_32RegClass), S32);

  CCInfo.AllocateReg(Reg);
  unsigned Mask = (Subtarget->hasPackedTID() &&
                   Info.hasWorkItemIDY()) ? 0x3ff : ~0u;
  Info.setWorkItemIDX(ArgDescriptor::createRegister(Reg, Mask));
}

if (Info.hasWorkItemIDY()) {
  assert(Info.hasWorkItemIDX())((void)0);
  if (Subtarget->hasPackedTID()) {
    Info.setWorkItemIDY(ArgDescriptor::createRegister(AMDGPU::VGPR0,
                                                      0x3ff << 10));
  } else {
    unsigned Reg = AMDGPU::VGPR1;
    MRI.setType(MF.addLiveIn(Reg, &AMDGPU::VGPR_32RegClass), S32);

    CCInfo.AllocateReg(Reg);
    Info.setWorkItemIDY(ArgDescriptor::createRegister(Reg));
  }
}

if (Info.hasWorkItemIDZ()) {
  assert(Info.hasWorkItemIDX() && Info.hasWorkItemIDY())((void)0);
  if (Subtarget->hasPackedTID()) {
    Info.setWorkItemIDZ(ArgDescriptor::createRegister(AMDGPU::VGPR0,
                                                      0x3ff << 20));
  } else {
    unsigned Reg = AMDGPU::VGPR2;
    MRI.setType(MF.addLiveIn(Reg, &AMDGPU::VGPR_32RegClass), S32);

    CCInfo.AllocateReg(Reg);
    Info.setWorkItemIDZ(ArgDescriptor::createRegister(Reg));
  }
}
1907}

1909// Try to allocate a VGPR at the end of the argument list, or if no argument
1910// VGPRs are left allocating a stack slot.
1911// If \p Mask is is given it indicates bitfield position in the register.
1912// If \p Arg is given use it with new ]p Mask instead of allocating new.
1913static ArgDescriptor allocateVGPR32Input(CCState &CCInfo, unsigned Mask = ~0u,
                                       ArgDescriptor Arg = ArgDescriptor()) {
if (Arg.isSet())
  return ArgDescriptor::createArg(Arg, Mask);

ArrayRef<MCPhysReg> ArgVGPRs
  = makeArrayRef(AMDGPU::VGPR_32RegClass.begin(), 32);
unsigned RegIdx = CCInfo.getFirstUnallocated(ArgVGPRs);
if (RegIdx == ArgVGPRs.size()) {
  // Spill to stack required.
  int64_t Offset = CCInfo.AllocateStack(4, Align(4));

  return ArgDescriptor::createStack(Offset, Mask);
}

unsigned Reg = ArgVGPRs[RegIdx];
Reg = CCInfo.AllocateReg(Reg);
assert(Reg != AMDGPU::NoRegister)((void)0);

MachineFunction &MF = CCInfo.getMachineFunction();
Register LiveInVReg = MF.addLiveIn(Reg, &AMDGPU::VGPR_32RegClass);
MF.getRegInfo().setType(LiveInVReg, LLT::scalar(32));
return ArgDescriptor::createRegister(Reg, Mask);
1936}

1938static ArgDescriptor allocateSGPR32InputImpl(CCState &CCInfo,
                                           const TargetRegisterClass *RC,
                                           unsigned NumArgRegs) {
ArrayRef<MCPhysReg> ArgSGPRs = makeArrayRef(RC->begin(), 32);
unsigned RegIdx = CCInfo.getFirstUnallocated(ArgSGPRs);
if (RegIdx == ArgSGPRs.size())
  report_fatal_error("ran out of SGPRs for arguments");

unsigned Reg = ArgSGPRs[RegIdx];
Reg = CCInfo.AllocateReg(Reg);
assert(Reg != AMDGPU::NoRegister)((void)0);

MachineFunction &MF = CCInfo.getMachineFunction();
MF.addLiveIn(Reg, RC);
return ArgDescriptor::createRegister(Reg);
1953}

1955// If this has a fixed position, we still should allocate the register in the
1956// CCInfo state. Technically we could get away with this for values passed
1957// outside of the normal argument range.
1958static void allocateFixedSGPRInputImpl(CCState &CCInfo,
                                     const TargetRegisterClass *RC,
                                     MCRegister Reg) {
Reg = CCInfo.AllocateReg(Reg);
assert(Reg != AMDGPU::NoRegister)((void)0);
MachineFunction &MF = CCInfo.getMachineFunction();
MF.addLiveIn(Reg, RC);
1965}

1967static void allocateSGPR32Input(CCState &CCInfo, ArgDescriptor &Arg) {
if (Arg) {
  allocateFixedSGPRInputImpl(CCInfo, &AMDGPU::SGPR_32RegClass,
                             Arg.getRegister());
} else
  Arg = allocateSGPR32InputImpl(CCInfo, &AMDGPU::SGPR_32RegClass, 32);
1973}

1975static void allocateSGPR64Input(CCState &CCInfo, ArgDescriptor &Arg) {
if (Arg) {
  allocateFixedSGPRInputImpl(CCInfo, &AMDGPU::SGPR_64RegClass,
                             Arg.getRegister());
} else
  Arg = allocateSGPR32InputImpl(CCInfo, &AMDGPU::SGPR_64RegClass, 16);
1981}

1983/// Allocate implicit function VGPR arguments at the end of allocated user
1984/// arguments.
1985void SITargetLowering::allocateSpecialInputVGPRs(
CCState &CCInfo, MachineFunction &MF,
const SIRegisterInfo &TRI, SIMachineFunctionInfo &Info) const {
const unsigned Mask = 0x3ff;
ArgDescriptor Arg;

if (Info.hasWorkItemIDX()) {
  Arg = allocateVGPR32Input(CCInfo, Mask);
  Info.setWorkItemIDX(Arg);
}

if (Info.hasWorkItemIDY()) {
  Arg = allocateVGPR32Input(CCInfo, Mask << 10, Arg);
  Info.setWorkItemIDY(Arg);
}

if (Info.hasWorkItemIDZ())
  Info.setWorkItemIDZ(allocateVGPR32Input(CCInfo, Mask << 20, Arg));
2003}

2005/// Allocate implicit function VGPR arguments in fixed registers.
2006void SITargetLowering::allocateSpecialInputVGPRsFixed(
CCState &CCInfo, MachineFunction &MF,
const SIRegisterInfo &TRI, SIMachineFunctionInfo &Info) const {
Register Reg = CCInfo.AllocateReg(AMDGPU::VGPR31);
if (!Reg)
  report_fatal_error("failed to allocated VGPR for implicit arguments");

const unsigned Mask = 0x3ff;
Info.setWorkItemIDX(ArgDescriptor::createRegister(Reg, Mask));
Info.setWorkItemIDY(ArgDescriptor::createRegister(Reg, Mask << 10));
Info.setWorkItemIDZ(ArgDescriptor::createRegister(Reg, Mask << 20));
2017}

2019void SITargetLowering::allocateSpecialInputSGPRs(
CCState &CCInfo,
MachineFunction &MF,
const SIRegisterInfo &TRI,
SIMachineFunctionInfo &Info) const {
auto &ArgInfo = Info.getArgInfo();

// TODO: Unify handling with private memory pointers.

if (Info.hasDispatchPtr())
  allocateSGPR64Input(CCInfo, ArgInfo.DispatchPtr);

if (Info.hasQueuePtr())
  allocateSGPR64Input(CCInfo, ArgInfo.QueuePtr);

// Implicit arg ptr takes the place of the kernarg segment pointer. This is a
// constant offset from the kernarg segment.
if (Info.hasImplicitArgPtr())
  allocateSGPR64Input(CCInfo, ArgInfo.ImplicitArgPtr);

if (Info.hasDispatchID())
  allocateSGPR64Input(CCInfo, ArgInfo.DispatchID);

// flat_scratch_init is not applicable for non-kernel functions.

if (Info.hasWorkGroupIDX())
  allocateSGPR32Input(CCInfo, ArgInfo.WorkGroupIDX);

if (Info.hasWorkGroupIDY())
  allocateSGPR32Input(CCInfo, ArgInfo.WorkGroupIDY);

if (Info.hasWorkGroupIDZ())
  allocateSGPR32Input(CCInfo, ArgInfo.WorkGroupIDZ);
2052}

2054// Allocate special inputs passed in user SGPRs.
2055void SITargetLowering::allocateHSAUserSGPRs(CCState &CCInfo,
                                          MachineFunction &MF,
                                          const SIRegisterInfo &TRI,
                                          SIMachineFunctionInfo &Info) const {
if (Info.hasImplicitBufferPtr()) {
  Register ImplicitBufferPtrReg = Info.addImplicitBufferPtr(TRI);
  MF.addLiveIn(ImplicitBufferPtrReg, &AMDGPU::SGPR_64RegClass);
  CCInfo.AllocateReg(ImplicitBufferPtrReg);
}

// FIXME: How should these inputs interact with inreg / custom SGPR inputs?
if (Info.hasPrivateSegmentBuffer()) {
  Register PrivateSegmentBufferReg = Info.addPrivateSegmentBuffer(TRI);
  MF.addLiveIn(PrivateSegmentBufferReg, &AMDGPU::SGPR_128RegClass);
  CCInfo.AllocateReg(PrivateSegmentBufferReg);
}

if (Info.hasDispatchPtr()) {
  Register DispatchPtrReg = Info.addDispatchPtr(TRI);
  MF.addLiveIn(DispatchPtrReg, &AMDGPU::SGPR_64RegClass);
  CCInfo.AllocateReg(DispatchPtrReg);
}

if (Info.hasQueuePtr()) {
  Register QueuePtrReg = Info.addQueuePtr(TRI);
  MF.addLiveIn(QueuePtrReg, &AMDGPU::SGPR_64RegClass);
  CCInfo.AllocateReg(QueuePtrReg);
}

if (Info.hasKernargSegmentPtr()) {
  MachineRegisterInfo &MRI = MF.getRegInfo();
  Register InputPtrReg = Info.addKernargSegmentPtr(TRI);
  CCInfo.AllocateReg(InputPtrReg);

  Register VReg = MF.addLiveIn(InputPtrReg, &AMDGPU::SGPR_64RegClass);
  MRI.setType(VReg, LLT::pointer(AMDGPUAS::CONSTANT_ADDRESS, 64));
}

if (Info.hasDispatchID()) {
  Register DispatchIDReg = Info.addDispatchID(TRI);
  MF.addLiveIn(DispatchIDReg, &AMDGPU::SGPR_64RegClass);
  CCInfo.AllocateReg(DispatchIDReg);
}

if (Info.hasFlatScratchInit() && !getSubtarget()->isAmdPalOS()) {
  Register FlatScratchInitReg = Info.addFlatScratchInit(TRI);
  MF.addLiveIn(FlatScratchInitReg, &AMDGPU::SGPR_64RegClass);
  CCInfo.AllocateReg(FlatScratchInitReg);
}

// TODO: Add GridWorkGroupCount user SGPRs when used. For now with HSA we read
// these from the dispatch pointer.
2107}

2109// Allocate special input registers that are initialized per-wave.
2110void SITargetLowering::allocateSystemSGPRs(CCState &CCInfo,
                                         MachineFunction &MF,
                                         SIMachineFunctionInfo &Info,
                                         CallingConv::ID CallConv,
                                         bool IsShader) const {
if (Info.hasWorkGroupIDX()) {
  Register Reg = Info.addWorkGroupIDX();
  MF.addLiveIn(Reg, &AMDGPU::SGPR_32RegClass);
  CCInfo.AllocateReg(Reg);
}

if (Info.hasWorkGroupIDY()) {
  Register Reg = Info.addWorkGroupIDY();
  MF.addLiveIn(Reg, &AMDGPU::SGPR_32RegClass);
  CCInfo.AllocateReg(Reg);
}

if (Info.hasWorkGroupIDZ()) {
  Register Reg = Info.addWorkGroupIDZ();
  MF.addLiveIn(Reg, &AMDGPU::SGPR_32RegClass);
  CCInfo.AllocateReg(Reg);
}

if (Info.hasWorkGroupInfo()) {
  Register Reg = Info.addWorkGroupInfo();
  MF.addLiveIn(Reg, &AMDGPU::SGPR_32RegClass);
  CCInfo.AllocateReg(Reg);
}

if (Info.hasPrivateSegmentWaveByteOffset()) {
  // Scratch wave offset passed in system SGPR.
  unsigned PrivateSegmentWaveByteOffsetReg;

  if (IsShader) {
    PrivateSegmentWaveByteOffsetReg =
      Info.getPrivateSegmentWaveByteOffsetSystemSGPR();

    // This is true if the scratch wave byte offset doesn't have a fixed
    // location.
    if (PrivateSegmentWaveByteOffsetReg == AMDGPU::NoRegister) {
      PrivateSegmentWaveByteOffsetReg = findFirstFreeSGPR(CCInfo);
      Info.setPrivateSegmentWaveByteOffset(PrivateSegmentWaveByteOffsetReg);
    }
  } else
    PrivateSegmentWaveByteOffsetReg = Info.addPrivateSegmentWaveByteOffset();

  MF.addLiveIn(PrivateSegmentWaveByteOffsetReg, &AMDGPU::SGPR_32RegClass);
  CCInfo.AllocateReg(PrivateSegmentWaveByteOffsetReg);
}
2159}

2161static void reservePrivateMemoryRegs(const TargetMachine &TM,
                                   MachineFunction &MF,
                                   const SIRegisterInfo &TRI,
                                   SIMachineFunctionInfo &Info) {
// Now that we've figured out where the scratch register inputs are, see if
// should reserve the arguments and use them directly.
MachineFrameInfo &MFI = MF.getFrameInfo();
bool HasStackObjects = MFI.hasStackObjects();
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();

// Record that we know we have non-spill stack objects so we don't need to
// check all stack objects later.
if (HasStackObjects)
  Info.setHasNonSpillStackObjects(true);

// Everything live out of a block is spilled with fast regalloc, so it's
// almost certain that spilling will be required.
if (TM.getOptLevel() == CodeGenOpt::None)
  HasStackObjects = true;

// For now assume stack access is needed in any callee functions, so we need
// the scratch registers to pass in.
bool RequiresStackAccess = HasStackObjects || MFI.hasCalls();

if (!ST.enableFlatScratch()) {
  if (RequiresStackAccess && ST.isAmdHsaOrMesa(MF.getFunction())) {
    // If we have stack objects, we unquestionably need the private buffer
    // resource. For the Code Object V2 ABI, this will be the first 4 user
    // SGPR inputs. We can reserve those and use them directly.

    Register PrivateSegmentBufferReg =
        Info.getPreloadedReg(AMDGPUFunctionArgInfo::PRIVATE_SEGMENT_BUFFER);
    Info.setScratchRSrcReg(PrivateSegmentBufferReg);
  } else {
    unsigned ReservedBufferReg = TRI.reservedPrivateSegmentBufferReg(MF);
    // We tentatively reserve the last registers (skipping the last registers
    // which may contain VCC, FLAT_SCR, and XNACK). After register allocation,
    // we'll replace these with the ones immediately after those which were
    // really allocated. In the prologue copies will be inserted from the
    // argument to these reserved registers.

    // Without HSA, relocations are used for the scratch pointer and the
    // buffer resource setup is always inserted in the prologue. Scratch wave
    // offset is still in an input SGPR.
    Info.setScratchRSrcReg(ReservedBufferReg);
  }
}

MachineRegisterInfo &MRI = MF.getRegInfo();

// For entry functions we have to set up the stack pointer if we use it,
// whereas non-entry functions get this "for free". This means there is no
// intrinsic advantage to using S32 over S34 in cases where we do not have
// calls but do need a frame pointer (i.e. if we are requested to have one
// because frame pointer elimination is disabled). To keep things simple we
// only ever use S32 as the call ABI stack pointer, and so using it does not
// imply we need a separate frame pointer.
//
// Try to use s32 as the SP, but move it if it would interfere with input
// arguments. This won't work with calls though.
//
// FIXME: Move SP to avoid any possible inputs, or find a way to spill input
// registers.
if (!MRI.isLiveIn(AMDGPU::SGPR32)) {
  Info.setStackPtrOffsetReg(AMDGPU::SGPR32);
} else {
  assert(AMDGPU::isShader(MF.getFunction().getCallingConv()))((void)0);

  if (MFI.hasCalls())
    report_fatal_error("call in graphics shader with too many input SGPRs");

  for (unsigned Reg : AMDGPU::SGPR_32RegClass) {
    if (!MRI.isLiveIn(Reg)) {
      Info.setStackPtrOffsetReg(Reg);
      break;
    }
  }

  if (Info.getStackPtrOffsetReg() == AMDGPU::SP_REG)
    report_fatal_error("failed to find register for SP");
}

// hasFP should be accurate for entry functions even before the frame is
// finalized, because it does not rely on the known stack size, only
// properties like whether variable sized objects are present.
if (ST.getFrameLowering()->hasFP(MF)) {
  Info.setFrameOffsetReg(AMDGPU::SGPR33);
}
2249}

2251bool SITargetLowering::supportSplitCSR(MachineFunction *MF) const {
const SIMachineFunctionInfo *Info = MF->getInfo<SIMachineFunctionInfo>();
return !Info->isEntryFunction();
2254}

2256void SITargetLowering::initializeSplitCSR(MachineBasicBlock *Entry) const {

2258}

2260void SITargetLowering::insertCopiesSplitCSR(
MachineBasicBlock *Entry,
const SmallVectorImpl<MachineBasicBlock *> &Exits) const {
const SIRegisterInfo *TRI = getSubtarget()->getRegisterInfo();

const MCPhysReg *IStart = TRI->getCalleeSavedRegsViaCopy(Entry->getParent());
if (!IStart)
  return;

const TargetInstrInfo *TII = Subtarget->getInstrInfo();
MachineRegisterInfo *MRI = &Entry->getParent()->getRegInfo();
MachineBasicBlock::iterator MBBI = Entry->begin();
for (const MCPhysReg *I = IStart; *I; ++I) {
  const TargetRegisterClass *RC = nullptr;
  if (AMDGPU::SReg_64RegClass.contains(*I))
    RC = &AMDGPU::SGPR_64RegClass;
  else if (AMDGPU::SReg_32RegClass.contains(*I))
    RC = &AMDGPU::SGPR_32RegClass;
  else
    llvm_unreachable("Unexpected register class in CSRsViaCopy!")__builtin_unreachable();

  Register NewVR = MRI->createVirtualRegister(RC);
  // Create copy from CSR to a virtual register.
  Entry->addLiveIn(*I);
  BuildMI(*Entry, MBBI, DebugLoc(), TII->get(TargetOpcode::COPY), NewVR)
    .addReg(*I);

  // Insert the copy-back instructions right before the terminator.
  for (auto *Exit : Exits)
    BuildMI(*Exit, Exit->getFirstTerminator(), DebugLoc(),
            TII->get(TargetOpcode::COPY), *I)
      .addReg(NewVR);
}
2293}

2295SDValue SITargetLowering::LowerFormalArguments(
  SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
  const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &DL,
  SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
const SIRegisterInfo *TRI = getSubtarget()->getRegisterInfo();

MachineFunction &MF = DAG.getMachineFunction();
const Function &Fn = MF.getFunction();
FunctionType *FType = MF.getFunction().getFunctionType();
SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();

if (Subtarget->isAmdHsaOS() && AMDGPU::isGraphics(CallConv)) {
  DiagnosticInfoUnsupported NoGraphicsHSA(
      Fn, "unsupported non-compute shaders with HSA", DL.getDebugLoc());
  DAG.getContext()->diagnose(NoGraphicsHSA);
  return DAG.getEntryNode();
}

Info->allocateModuleLDSGlobal(Fn.getParent());

SmallVector<ISD::InputArg, 16> Splits;
SmallVector<CCValAssign, 16> ArgLocs;
BitVector Skipped(Ins.size());
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs,
               *DAG.getContext());

bool IsGraphics = AMDGPU::isGraphics(CallConv);
bool IsKernel = AMDGPU::isKernel(CallConv);
bool IsEntryFunc = AMDGPU::isEntryFunctionCC(CallConv);

if (IsGraphics) {
  assert(!Info->hasDispatchPtr() && !Info->hasKernargSegmentPtr() &&((void)0)
         (!Info->hasFlatScratchInit() || Subtarget->enableFlatScratch()) &&((void)0)
         !Info->hasWorkGroupIDX() && !Info->hasWorkGroupIDY() &&((void)0)
         !Info->hasWorkGroupIDZ() && !Info->hasWorkGroupInfo() &&((void)0)
         !Info->hasWorkItemIDX() && !Info->hasWorkItemIDY() &&((void)0)
         !Info->hasWorkItemIDZ())((void)0);
}

if (CallConv == CallingConv::AMDGPU_PS) {
  processPSInputArgs(Splits, CallConv, Ins, Skipped, FType, Info);

  // At least one interpolation mode must be enabled or else the GPU will
  // hang.
  //
  // Check PSInputAddr instead of PSInputEnable. The idea is that if the user
  // set PSInputAddr, the user wants to enable some bits after the compilation
  // based on run-time states. Since we can't know what the final PSInputEna
  // will look like, so we shouldn't do anything here and the user should take
  // responsibility for the correct programming.
  //
  // Otherwise, the following restrictions apply:
  // - At least one of PERSP_* (0xF) or LINEAR_* (0x70) must be enabled.
  // - If POS_W_FLOAT (11) is enabled, at least one of PERSP_* must be
  //   enabled too.
  if ((Info->getPSInputAddr() & 0x7F) == 0 ||
      ((Info->getPSInputAddr() & 0xF) == 0 && Info->isPSInputAllocated(11))) {
    CCInfo.AllocateReg(AMDGPU::VGPR0);
    CCInfo.AllocateReg(AMDGPU::VGPR1);
    Info->markPSInputAllocated(0);
    Info->markPSInputEnabled(0);
  }
  if (Subtarget->isAmdPalOS()) {
    // For isAmdPalOS, the user does not enable some bits after compilation
    // based on run-time states; the register values being generated here are
    // the final ones set in hardware. Therefore we need to apply the
    // workaround to PSInputAddr and PSInputEnable together.  (The case where
    // a bit is set in PSInputAddr but not PSInputEnable is where the
    // frontend set up an input arg for a particular interpolation mode, but
    // nothing uses that input arg. Really we should have an earlier pass
    // that removes such an arg.)
    unsigned PsInputBits = Info->getPSInputAddr() & Info->getPSInputEnable();
    if ((PsInputBits & 0x7F) == 0 ||
        ((PsInputBits & 0xF) == 0 && (PsInputBits >> 11 & 1)))
      Info->markPSInputEnabled(
          countTrailingZeros(Info->getPSInputAddr(), ZB_Undefined));
  }
} else if (IsKernel) {
  assert(Info->hasWorkGroupIDX() && Info->hasWorkItemIDX())((void)0);
} else {
  Splits.append(Ins.begin(), Ins.end());
}

if (IsEntryFunc) {
  allocateSpecialEntryInputVGPRs(CCInfo, MF, *TRI, *Info);
  allocateHSAUserSGPRs(CCInfo, MF, *TRI, *Info);
} else {
  // For the fixed ABI, pass workitem IDs in the last argument register.
  if (AMDGPUTargetMachine::EnableFixedFunctionABI)
    allocateSpecialInputVGPRsFixed(CCInfo, MF, *TRI, *Info);
}

if (IsKernel) {
  analyzeFormalArgumentsCompute(CCInfo, Ins);
} else {
  CCAssignFn *AssignFn = CCAssignFnForCall(CallConv, isVarArg);
  CCInfo.AnalyzeFormalArguments(Splits, AssignFn);
}

SmallVector<SDValue, 16> Chains;

// FIXME: This is the minimum kernel argument alignment. We should improve
// this to the maximum alignment of the arguments.
//
// FIXME: Alignment of explicit arguments totally broken with non-0 explicit
// kern arg offset.
const Align KernelArgBaseAlign = Align(16);

for (unsigned i = 0, e = Ins.size(), ArgIdx = 0; i != e; ++i) {
  const ISD::InputArg &Arg = Ins[i];
  if (Arg.isOrigArg() && Skipped[Arg.getOrigArgIndex()]) {
    InVals.push_back(DAG.getUNDEF(Arg.VT));
    continue;
  }

  CCValAssign &VA = ArgLocs[ArgIdx++];
  MVT VT = VA.getLocVT();

  if (IsEntryFunc && VA.isMemLoc()) {
    VT = Ins[i].VT;
    EVT MemVT = VA.getLocVT();

    const uint64_t Offset = VA.getLocMemOffset();
    Align Alignment = commonAlignment(KernelArgBaseAlign, Offset);

    if (Arg.Flags.isByRef()) {
      SDValue Ptr = lowerKernArgParameterPtr(DAG, DL, Chain, Offset);

      const GCNTargetMachine &TM =
          static_cast<const GCNTargetMachine &>(getTargetMachine());
      if (!TM.isNoopAddrSpaceCast(AMDGPUAS::CONSTANT_ADDRESS,
                                  Arg.Flags.getPointerAddrSpace())) {
        Ptr = DAG.getAddrSpaceCast(DL, VT, Ptr, AMDGPUAS::CONSTANT_ADDRESS,
                                   Arg.Flags.getPointerAddrSpace());
      }

      InVals.push_back(Ptr);
      continue;
    }

    SDValue Arg = lowerKernargMemParameter(
      DAG, VT, MemVT, DL, Chain, Offset, Alignment, Ins[i].Flags.isSExt(), &Ins[i]);
    Chains.push_back(Arg.getValue(1));

    auto *ParamTy =
      dyn_cast<PointerType>(FType->getParamType(Ins[i].getOrigArgIndex()));
    if (Subtarget->getGeneration() == AMDGPUSubtarget::SOUTHERN_ISLANDS &&
        ParamTy && (ParamTy->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS ||
                    ParamTy->getAddressSpace() == AMDGPUAS::REGION_ADDRESS)) {
      // On SI local pointers are just offsets into LDS, so they are always
      // less than 16-bits.  On CI and newer they could potentially be
      // real pointers, so we can't guarantee their size.
      Arg = DAG.getNode(ISD::AssertZext, DL, Arg.getValueType(), Arg,
                        DAG.getValueType(MVT::i16));
    }

    InVals.push_back(Arg);
    continue;
  } else if (!IsEntryFunc && VA.isMemLoc()) {
    SDValue Val = lowerStackParameter(DAG, VA, DL, Chain, Arg);
    InVals.push_back(Val);
    if (!Arg.Flags.isByVal())
      Chains.push_back(Val.getValue(1));
    continue;
  }

  assert(VA.isRegLoc() && "Parameter must be in a register!")((void)0);

  Register Reg = VA.getLocReg();
  const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg, VT);
  EVT ValVT = VA.getValVT();

  Reg = MF.addLiveIn(Reg, RC);
  SDValue Val = DAG.getCopyFromReg(Chain, DL, Reg, VT);

  if (Arg.Flags.isSRet()) {
    // The return object should be reasonably addressable.

    // FIXME: This helps when the return is a real sret. If it is a
    // automatically inserted sret (i.e. CanLowerReturn returns false), an
    // extra copy is inserted in SelectionDAGBuilder which obscures this.
    unsigned NumBits
      = 32 - getSubtarget()->getKnownHighZeroBitsForFrameIndex();
    Val = DAG.getNode(ISD::AssertZext, DL, VT, Val,
      DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(), NumBits)));
  }

  // If this is an 8 or 16-bit value, it is really passed promoted
  // to 32 bits. Insert an assert[sz]ext to capture this, then
  // truncate to the right size.
  switch (VA.getLocInfo()) {
  case CCValAssign::Full:
    break;
  case CCValAssign::BCvt:
    Val = DAG.getNode(ISD::BITCAST, DL, ValVT, Val);
    break;
  case CCValAssign::SExt:
    Val = DAG.getNode(ISD::AssertSext, DL, VT, Val,
                      DAG.getValueType(ValVT));
    Val = DAG.getNode(ISD::TRUNCATE, DL, ValVT, Val);
    break;
  case CCValAssign::ZExt:
    Val = DAG.getNode(ISD::AssertZext, DL, VT, Val,
                      DAG.getValueType(ValVT));
    Val = DAG.getNode(ISD::TRUNCATE, DL, ValVT, Val);
    break;
  case CCValAssign::AExt:
    Val = DAG.getNode(ISD::TRUNCATE, DL, ValVT, Val);
    break;
  default:
    llvm_unreachable("Unknown loc info!")__builtin_unreachable();
  }

  InVals.push_back(Val);
}

if (!IsEntryFunc && !AMDGPUTargetMachine::EnableFixedFunctionABI) {
  // Special inputs come after user arguments.
  allocateSpecialInputVGPRs(CCInfo, MF, *TRI, *Info);
}

// Start adding system SGPRs.
if (IsEntryFunc) {
  allocateSystemSGPRs(CCInfo, MF, *Info, CallConv, IsGraphics);
} else {
  CCInfo.AllocateReg(Info->getScratchRSrcReg());
  allocateSpecialInputSGPRs(CCInfo, MF, *TRI, *Info);
}

auto &ArgUsageInfo =
  DAG.getPass()->getAnalysis<AMDGPUArgumentUsageInfo>();
ArgUsageInfo.setFuncArgInfo(Fn, Info->getArgInfo());

unsigned StackArgSize = CCInfo.getNextStackOffset();
Info->setBytesInStackArgArea(StackArgSize);

return Chains.empty() ? Chain :
  DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Chains);
2533}

2535// TODO: If return values can't fit in registers, we should return as many as
2536// possible in registers before passing on stack.
2537bool SITargetLowering::CanLowerReturn(
CallingConv::ID CallConv,
MachineFunction &MF, bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context) const {
// Replacing returns with sret/stack usage doesn't make sense for shaders.
// FIXME: Also sort of a workaround for custom vector splitting in LowerReturn
// for shaders. Vector types should be explicitly handled by CC.
if (AMDGPU::isEntryFunctionCC(CallConv))
  return true;

SmallVector<CCValAssign, 16> RVLocs;
CCState CCInfo(CallConv, IsVarArg, MF, RVLocs, Context);
return CCInfo.CheckReturn(Outs, CCAssignFnForReturn(CallConv, IsVarArg));
2551}

2553SDValue
2554SITargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv,
                            bool isVarArg,
                            const SmallVectorImpl<ISD::OutputArg> &Outs,
                            const SmallVectorImpl<SDValue> &OutVals,
                            const SDLoc &DL, SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();

if (AMDGPU::isKernel(CallConv)) {
  return AMDGPUTargetLowering::LowerReturn(Chain, CallConv, isVarArg, Outs,
                                           OutVals, DL, DAG);
}

bool IsShader = AMDGPU::isShader(CallConv);

Info->setIfReturnsVoid(Outs.empty());
bool IsWaveEnd = Info->returnsVoid() && IsShader;

// CCValAssign - represent the assignment of the return value to a location.
SmallVector<CCValAssign, 48> RVLocs;
SmallVector<ISD::OutputArg, 48> Splits;

// CCState - Info about the registers and stack slots.
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs,
               *DAG.getContext());

// Analyze outgoing return values.
CCInfo.AnalyzeReturn(Outs, CCAssignFnForReturn(CallConv, isVarArg));

SDValue Flag;
SmallVector<SDValue, 48> RetOps;
RetOps.push_back(Chain); // Operand #0 = Chain (updated below)

// Add return address for callable functions.
if (!Info->isEntryFunction()) {
  const SIRegisterInfo *TRI = getSubtarget()->getRegisterInfo();
  SDValue ReturnAddrReg = CreateLiveInRegister(
    DAG, &AMDGPU::SReg_64RegClass, TRI->getReturnAddressReg(MF), MVT::i64);

  SDValue ReturnAddrVirtualReg = DAG.getRegister(
      MF.getRegInfo().createVirtualRegister(&AMDGPU::CCR_SGPR_64RegClass),
      MVT::i64);
  Chain =
      DAG.getCopyToReg(Chain, DL, ReturnAddrVirtualReg, ReturnAddrReg, Flag);
  Flag = Chain.getValue(1);
  RetOps.push_back(ReturnAddrVirtualReg);
}

// Copy the result values into the output registers.
for (unsigned I = 0, RealRVLocIdx = 0, E = RVLocs.size(); I != E;
     ++I, ++RealRVLocIdx) {
  CCValAssign &VA = RVLocs[I];
  assert(VA.isRegLoc() && "Can only return in registers!")((void)0);
  // TODO: Partially return in registers if return values don't fit.
  SDValue Arg = OutVals[RealRVLocIdx];

  // Copied from other backends.
  switch (VA.getLocInfo()) {
  case CCValAssign::Full:
    break;
  case CCValAssign::BCvt:
    Arg = DAG.getNode(ISD::BITCAST, DL, VA.getLocVT(), Arg);
    break;
  case CCValAssign::SExt:
    Arg = DAG.getNode(ISD::SIGN_EXTEND, DL, VA.getLocVT(), Arg);
    break;
  case CCValAssign::ZExt:
    Arg = DAG.getNode(ISD::ZERO_EXTEND, DL, VA.getLocVT(), Arg);
    break;
  case CCValAssign::AExt:
    Arg = DAG.getNode(ISD::ANY_EXTEND, DL, VA.getLocVT(), Arg);
    break;
  default:
    llvm_unreachable("Unknown loc info!")__builtin_unreachable();
  }

  Chain = DAG.getCopyToReg(Chain, DL, VA.getLocReg(), Arg, Flag);
  Flag = Chain.getValue(1);
  RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
}

// FIXME: Does sret work properly?
if (!Info->isEntryFunction()) {
  const SIRegisterInfo *TRI = Subtarget->getRegisterInfo();
  const MCPhysReg *I =
    TRI->getCalleeSavedRegsViaCopy(&DAG.getMachineFunction());
  if (I) {
    for (; *I; ++I) {
      if (AMDGPU::SReg_64RegClass.contains(*I))
        RetOps.push_back(DAG.getRegister(*I, MVT::i64));
      else if (AMDGPU::SReg_32RegClass.contains(*I))
        RetOps.push_back(DAG.getRegister(*I, MVT::i32));
      else
        llvm_unreachable("Unexpected register class in CSRsViaCopy!")__builtin_unreachable();
    }
  }
}

// Update chain and glue.
RetOps[0] = Chain;
if (Flag.getNode())
  RetOps.push_back(Flag);

unsigned Opc = AMDGPUISD::ENDPGM;
if (!IsWaveEnd)
  Opc = IsShader ? AMDGPUISD::RETURN_TO_EPILOG : AMDGPUISD::RET_FLAG;
return DAG.getNode(Opc, DL, MVT::Other, RetOps);
2661}

2663SDValue SITargetLowering::LowerCallResult(
  SDValue Chain, SDValue InFlag, CallingConv::ID CallConv, bool IsVarArg,
  const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &DL,
  SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals, bool IsThisReturn,
  SDValue ThisVal) const {
CCAssignFn *RetCC = CCAssignFnForReturn(CallConv, IsVarArg);

// Assign locations to each value returned by this call.
SmallVector<CCValAssign, 16> RVLocs;
CCState CCInfo(CallConv, IsVarArg, DAG.getMachineFunction(), RVLocs,
               *DAG.getContext());
CCInfo.AnalyzeCallResult(Ins, RetCC);

// Copy all of the result registers out of their specified physreg.
for (unsigned i = 0; i != RVLocs.size(); ++i) {
  CCValAssign VA = RVLocs[i];
  SDValue Val;

  if (VA.isRegLoc()) {
    Val = DAG.getCopyFromReg(Chain, DL, VA.getLocReg(), VA.getLocVT(), InFlag);
    Chain = Val.getValue(1);
    InFlag = Val.getValue(2);
  } else if (VA.isMemLoc()) {
    report_fatal_error("TODO: return values in memory");
  } else
    llvm_unreachable("unknown argument location type")__builtin_unreachable();

  switch (VA.getLocInfo()) {
  case CCValAssign::Full:
    break;
  case CCValAssign::BCvt:
    Val = DAG.getNode(ISD::BITCAST, DL, VA.getValVT(), Val);
    break;
  case CCValAssign::ZExt:
    Val = DAG.getNode(ISD::AssertZext, DL, VA.getLocVT(), Val,
                      DAG.getValueType(VA.getValVT()));
    Val = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), Val);
    break;
  case CCValAssign::SExt:
    Val = DAG.getNode(ISD::AssertSext, DL, VA.getLocVT(), Val,
                      DAG.getValueType(VA.getValVT()));
    Val = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), Val);
    break;
  case CCValAssign::AExt:
    Val = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), Val);
    break;
  default:
    llvm_unreachable("Unknown loc info!")__builtin_unreachable();
  }

  InVals.push_back(Val);
}

return Chain;
2717}

2719// Add code to pass special inputs required depending on used features separate
2720// from the explicit user arguments present in the IR.
2721void SITargetLowering::passSpecialInputs(
  CallLoweringInfo &CLI,
  CCState &CCInfo,
  const SIMachineFunctionInfo &Info,
  SmallVectorImpl<std::pair<unsigned, SDValue>> &RegsToPass,
  SmallVectorImpl<SDValue> &MemOpChains,
  SDValue Chain) const {
// If we don't have a call site, this was a call inserted by
// legalization. These can never use special inputs.
if (!CLI.CB)
  return;

SelectionDAG &DAG = CLI.DAG;
const SDLoc &DL = CLI.DL;

const SIRegisterInfo *TRI = Subtarget->getRegisterInfo();
const AMDGPUFunctionArgInfo &CallerArgInfo = Info.getArgInfo();

const AMDGPUFunctionArgInfo *CalleeArgInfo
  = &AMDGPUArgumentUsageInfo::FixedABIFunctionInfo;
if (const Function *CalleeFunc = CLI.CB->getCalledFunction()) {
  auto &ArgUsageInfo =
    DAG.getPass()->getAnalysis<AMDGPUArgumentUsageInfo>();
  CalleeArgInfo = &ArgUsageInfo.lookupFuncArgInfo(*CalleeFunc);
}

// TODO: Unify with private memory register handling. This is complicated by
// the fact that at least in kernels, the input argument is not necessarily
// in the same location as the input.
AMDGPUFunctionArgInfo::PreloadedValue InputRegs[] = {
  AMDGPUFunctionArgInfo::DISPATCH_PTR,
  AMDGPUFunctionArgInfo::QUEUE_PTR,
  AMDGPUFunctionArgInfo::IMPLICIT_ARG_PTR,
  AMDGPUFunctionArgInfo::DISPATCH_ID,
  AMDGPUFunctionArgInfo::WORKGROUP_ID_X,
  AMDGPUFunctionArgInfo::WORKGROUP_ID_Y,
  AMDGPUFunctionArgInfo::WORKGROUP_ID_Z
};

for (auto InputID : InputRegs) {
  const ArgDescriptor *OutgoingArg;
  const TargetRegisterClass *ArgRC;
  LLT ArgTy;

  std::tie(OutgoingArg, ArgRC, ArgTy) =
      CalleeArgInfo->getPreloadedValue(InputID);
  if (!OutgoingArg)
    continue;

  const ArgDescriptor *IncomingArg;
  const TargetRegisterClass *IncomingArgRC;
  LLT Ty;
  std::tie(IncomingArg, IncomingArgRC, Ty) =
      CallerArgInfo.getPreloadedValue(InputID);
  assert(IncomingArgRC == ArgRC)((void)0);

  // All special arguments are ints for now.
  EVT ArgVT = TRI->getSpillSize(*ArgRC) == 8 ? MVT::i64 : MVT::i32;
  SDValue InputReg;

  if (IncomingArg) {
    InputReg = loadInputValue(DAG, ArgRC, ArgVT, DL, *IncomingArg);
  } else {
    // The implicit arg ptr is special because it doesn't have a corresponding
    // input for kernels, and is computed from the kernarg segment pointer.
    assert(InputID == AMDGPUFunctionArgInfo::IMPLICIT_ARG_PTR)((void)0);
    InputReg = getImplicitArgPtr(DAG, DL);
  }

  if (OutgoingArg->isRegister()) {
    RegsToPass.emplace_back(OutgoingArg->getRegister(), InputReg);
    if (!CCInfo.AllocateReg(OutgoingArg->getRegister()))
      report_fatal_error("failed to allocate implicit input argument");
  } else {
    unsigned SpecialArgOffset =
        CCInfo.AllocateStack(ArgVT.getStoreSize(), Align(4));
    SDValue ArgStore = storeStackInputValue(DAG, DL, Chain, InputReg,
                                            SpecialArgOffset);
    MemOpChains.push_back(ArgStore);
  }
}

// Pack workitem IDs into a single register or pass it as is if already
// packed.
const ArgDescriptor *OutgoingArg;
const TargetRegisterClass *ArgRC;
LLT Ty;

std::tie(OutgoingArg, ArgRC, Ty) =
    CalleeArgInfo->getPreloadedValue(AMDGPUFunctionArgInfo::WORKITEM_ID_X);
if (!OutgoingArg)
  std::tie(OutgoingArg, ArgRC, Ty) =
      CalleeArgInfo->getPreloadedValue(AMDGPUFunctionArgInfo::WORKITEM_ID_Y);
if (!OutgoingArg)
  std::tie(OutgoingArg, ArgRC, Ty) =
      CalleeArgInfo->getPreloadedValue(AMDGPUFunctionArgInfo::WORKITEM_ID_Z);
if (!OutgoingArg)
  return;

const ArgDescriptor *IncomingArgX = std::get<0>(
    CallerArgInfo.getPreloadedValue(AMDGPUFunctionArgInfo::WORKITEM_ID_X));
const ArgDescriptor *IncomingArgY = std::get<0>(
    CallerArgInfo.getPreloadedValue(AMDGPUFunctionArgInfo::WORKITEM_ID_Y));
const ArgDescriptor *IncomingArgZ = std::get<0>(
    CallerArgInfo.getPreloadedValue(AMDGPUFunctionArgInfo::WORKITEM_ID_Z));

SDValue InputReg;
SDLoc SL;

// If incoming ids are not packed we need to pack them.
if (IncomingArgX && !IncomingArgX->isMasked() && CalleeArgInfo->WorkItemIDX)
  InputReg = loadInputValue(DAG, ArgRC, MVT::i32, DL, *IncomingArgX);

if (IncomingArgY && !IncomingArgY->isMasked() && CalleeArgInfo->WorkItemIDY) {
  SDValue Y = loadInputValue(DAG, ArgRC, MVT::i32, DL, *IncomingArgY);
  Y = DAG.getNode(ISD::SHL, SL, MVT::i32, Y,
                  DAG.getShiftAmountConstant(10, MVT::i32, SL));
  InputReg = InputReg.getNode() ?
               DAG.getNode(ISD::OR, SL, MVT::i32, InputReg, Y) : Y;
}

if (IncomingArgZ && !IncomingArgZ->isMasked() && CalleeArgInfo->WorkItemIDZ) {
  SDValue Z = loadInputValue(DAG, ArgRC, MVT::i32, DL, *IncomingArgZ);
  Z = DAG.getNode(ISD::SHL, SL, MVT::i32, Z,
                  DAG.getShiftAmountConstant(20, MVT::i32, SL));
  InputReg = InputReg.getNode() ?
               DAG.getNode(ISD::OR, SL, MVT::i32, InputReg, Z) : Z;
}

if (!InputReg.getNode()) {
  // Workitem ids are already packed, any of present incoming arguments
  // will carry all required fields.
  ArgDescriptor IncomingArg = ArgDescriptor::createArg(
    IncomingArgX ? *IncomingArgX :
    IncomingArgY ? *IncomingArgY :
                   *IncomingArgZ, ~0u);
  InputReg = loadInputValue(DAG, ArgRC, MVT::i32, DL, IncomingArg);
}

if (OutgoingArg->isRegister()) {
  RegsToPass.emplace_back(OutgoingArg->getRegister(), InputReg);
  CCInfo.AllocateReg(OutgoingArg->getRegister());
} else {
  unsigned SpecialArgOffset = CCInfo.AllocateStack(4, Align(4));
  SDValue ArgStore = storeStackInputValue(DAG, DL, Chain, InputReg,
                                          SpecialArgOffset);
  MemOpChains.push_back(ArgStore);
}
2869}

2871static bool canGuaranteeTCO(CallingConv::ID CC) {
return CC == CallingConv::Fast;
2873}

2875/// Return true if we might ever do TCO for calls with this calling convention.
2876static bool mayTailCallThisCC(CallingConv::ID CC) {
switch (CC) {
case CallingConv::C:
case CallingConv::AMDGPU_Gfx:
  return true;
default:
  return canGuaranteeTCO(CC);
}
2884}

2886bool SITargetLowering::isEligibleForTailCallOptimization(
  SDValue Callee, CallingConv::ID CalleeCC, bool IsVarArg,
  const SmallVectorImpl<ISD::OutputArg> &Outs,
  const SmallVectorImpl<SDValue> &OutVals,
  const SmallVectorImpl<ISD::InputArg> &Ins, SelectionDAG &DAG) const {
if (!mayTailCallThisCC(CalleeCC))
  return false;

// For a divergent call target, we need to do a waterfall loop over the
// possible callees which precludes us from using a simple jump.
if (Callee->isDivergent())
  return false;

MachineFunction &MF = DAG.getMachineFunction();
const Function &CallerF = MF.getFunction();
CallingConv::ID CallerCC = CallerF.getCallingConv();
const SIRegisterInfo *TRI = getSubtarget()->getRegisterInfo();
const uint32_t *CallerPreserved = TRI->getCallPreservedMask(MF, CallerCC);

// Kernels aren't callable, and don't have a live in return address so it
// doesn't make sense to do a tail call with entry functions.
if (!CallerPreserved)
  return false;

bool CCMatch = CallerCC == CalleeCC;

if (DAG.getTarget().Options.GuaranteedTailCallOpt) {
  if (canGuaranteeTCO(CalleeCC) && CCMatch)
    return true;
  return false;
}

// TODO: Can we handle var args?
if (IsVarArg)
  return false;

for (const Argument &Arg : CallerF.args()) {
  if (Arg.hasByValAttr())
    return false;
}

LLVMContext &Ctx = *DAG.getContext();

// Check that the call results are passed in the same way.
if (!CCState::resultsCompatible(CalleeCC, CallerCC, MF, Ctx, Ins,
                                CCAssignFnForCall(CalleeCC, IsVarArg),
                                CCAssignFnForCall(CallerCC, IsVarArg)))
  return false;

// The callee has to preserve all registers the caller needs to preserve.
if (!CCMatch) {
  const uint32_t *CalleePreserved = TRI->getCallPreservedMask(MF, CalleeCC);
  if (!TRI->regmaskSubsetEqual(CallerPreserved, CalleePreserved))
    return false;
}

// Nothing more to check if the callee is taking no arguments.
if (Outs.empty())
  return true;

SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CalleeCC, IsVarArg, MF, ArgLocs, Ctx);

CCInfo.AnalyzeCallOperands(Outs, CCAssignFnForCall(CalleeCC, IsVarArg));

const SIMachineFunctionInfo *FuncInfo = MF.getInfo<SIMachineFunctionInfo>();
// If the stack arguments for this call do not fit into our own save area then
// the call cannot be made tail.
// TODO: Is this really necessary?
if (CCInfo.getNextStackOffset() > FuncInfo->getBytesInStackArgArea())
  return false;

const MachineRegisterInfo &MRI = MF.getRegInfo();
return parametersInCSRMatch(MRI, CallerPreserved, ArgLocs, OutVals);
2960}

2962bool SITargetLowering::mayBeEmittedAsTailCall(const CallInst *CI) const {
if (!CI->isTailCall())
  return false;

const Function *ParentFn = CI->getParent()->getParent();
if (AMDGPU::isEntryFunctionCC(ParentFn->getCallingConv()))
  return false;
return true;
2970}

2972// The wave scratch offset register is used as the global base pointer.
2973SDValue SITargetLowering::LowerCall(CallLoweringInfo &CLI,
                                  SmallVectorImpl<SDValue> &InVals) const {
SelectionDAG &DAG = CLI.DAG;
const SDLoc &DL = CLI.DL;
SmallVector<ISD::OutputArg, 32> &Outs = CLI.Outs;
SmallVector<SDValue, 32> &OutVals = CLI.OutVals;
SmallVector<ISD::InputArg, 32> &Ins = CLI.Ins;
SDValue Chain = CLI.Chain;
SDValue Callee = CLI.Callee;
bool &IsTailCall = CLI.IsTailCall;
CallingConv::ID CallConv = CLI.CallConv;
bool IsVarArg = CLI.IsVarArg;
bool IsSibCall = false;
bool IsThisReturn = false;
MachineFunction &MF = DAG.getMachineFunction();

if (Callee.isUndef() || isNullConstant(Callee)) {
  if (!CLI.IsTailCall) {
    for (unsigned I = 0, E = CLI.Ins.size(); I != E; ++I)
      InVals.push_back(DAG.getUNDEF(CLI.Ins[I].VT));
  }

  return Chain;
}

if (IsVarArg) {
  return lowerUnhandledCall(CLI, InVals,
                            "unsupported call to variadic function ");
}

if (!CLI.CB)
  report_fatal_error("unsupported libcall legalization");

if (IsTailCall && MF.getTarget().Options.GuaranteedTailCallOpt) {
  return lowerUnhandledCall(CLI, InVals,
                            "unsupported required tail call to function ");
}

if (AMDGPU::isShader(CallConv)) {
  // Note the issue is with the CC of the called function, not of the call
  // itself.
  return lowerUnhandledCall(CLI, InVals,
                            "unsupported call to a shader function ");
}

if (AMDGPU::isShader(MF.getFunction().getCallingConv()) &&
    CallConv != CallingConv::AMDGPU_Gfx) {
  // Only allow calls with specific calling conventions.
  return lowerUnhandledCall(CLI, InVals,
                            "unsupported calling convention for call from "
                            "graphics shader of function ");
}

if (IsTailCall) {
  IsTailCall = isEligibleForTailCallOptimization(
    Callee, CallConv, IsVarArg, Outs, OutVals, Ins, DAG);
  if (!IsTailCall && CLI.CB && CLI.CB->isMustTailCall()) {
    report_fatal_error("failed to perform tail call elimination on a call "
                       "site marked musttail");
  }

  bool TailCallOpt = MF.getTarget().Options.GuaranteedTailCallOpt;

  // A sibling call is one where we're under the usual C ABI and not planning
  // to change that but can still do a tail call:
  if (!TailCallOpt && IsTailCall)
    IsSibCall = true;

  if (IsTailCall)
    ++NumTailCalls;
}

const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
SmallVector<SDValue, 8> MemOpChains;

// Analyze operands of the call, assigning locations to each operand.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, IsVarArg, MF, ArgLocs, *DAG.getContext());
CCAssignFn *AssignFn = CCAssignFnForCall(CallConv, IsVarArg);

if (AMDGPUTargetMachine::EnableFixedFunctionABI &&
    CallConv != CallingConv::AMDGPU_Gfx) {
  // With a fixed ABI, allocate fixed registers before user arguments.
  passSpecialInputs(CLI, CCInfo, *Info, RegsToPass, MemOpChains, Chain);
}

CCInfo.AnalyzeCallOperands(Outs, AssignFn);

// Get a count of how many bytes are to be pushed on the stack.
unsigned NumBytes = CCInfo.getNextStackOffset();

if (IsSibCall) {
  // Since we're not changing the ABI to make this a tail call, the memory
  // operands are already available in the caller's incoming argument space.
  NumBytes = 0;
}

// FPDiff is the byte offset of the call's argument area from the callee's.
// Stores to callee stack arguments will be placed in FixedStackSlots offset
// by this amount for a tail call. In a sibling call it must be 0 because the
// caller will deallocate the entire stack and the callee still expects its
// arguments to begin at SP+0. Completely unused for non-tail calls.
int32_t FPDiff = 0;
MachineFrameInfo &MFI = MF.getFrameInfo();

// Adjust the stack pointer for the new arguments...
// These operations are automatically eliminated by the prolog/epilog pass
if (!IsSibCall) {
  Chain = DAG.getCALLSEQ_START(Chain, 0, 0, DL);

  if (!Subtarget->enableFlatScratch()) {
    SmallVector<SDValue, 4> CopyFromChains;

    // In the HSA case, this should be an identity copy.
    SDValue ScratchRSrcReg
      = DAG.getCopyFromReg(Chain, DL, Info->getScratchRSrcReg(), MVT::v4i32);
    RegsToPass.emplace_back(AMDGPU::SGPR0_SGPR1_SGPR2_SGPR3, ScratchRSrcReg);
    CopyFromChains.push_back(ScratchRSrcReg.getValue(1));
    Chain = DAG.getTokenFactor(DL, CopyFromChains);
  }
}

MVT PtrVT = MVT::i32;

// Walk the register/memloc assignments, inserting copies/loads.
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
  CCValAssign &VA = ArgLocs[i];
  SDValue Arg = OutVals[i];

  // Promote the value if needed.
  switch (VA.getLocInfo()) {
  case CCValAssign::Full:
    break;
  case CCValAssign::BCvt:
    Arg = DAG.getNode(ISD::BITCAST, DL, VA.getLocVT(), Arg);
    break;
  case CCValAssign::ZExt:
    Arg = DAG.getNode(ISD::ZERO_EXTEND, DL, VA.getLocVT(), Arg);
    break;
  case CCValAssign::SExt:
    Arg = DAG.getNode(ISD::SIGN_EXTEND, DL, VA.getLocVT(), Arg);
    break;
  case CCValAssign::AExt:
    Arg = DAG.getNode(ISD::ANY_EXTEND, DL, VA.getLocVT(), Arg);
    break;
  case CCValAssign::FPExt:
    Arg = DAG.getNode(ISD::FP_EXTEND, DL, VA.getLocVT(), Arg);
    break;
  default:
    llvm_unreachable("Unknown loc info!")__builtin_unreachable();
  }

  if (VA.isRegLoc()) {
    RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
  } else {
    assert(VA.isMemLoc())((void)0);

    SDValue DstAddr;
    MachinePointerInfo DstInfo;

    unsigned LocMemOffset = VA.getLocMemOffset();
    int32_t Offset = LocMemOffset;

    SDValue PtrOff = DAG.getConstant(Offset, DL, PtrVT);
    MaybeAlign Alignment;

    if (IsTailCall) {
      ISD::ArgFlagsTy Flags = Outs[i].Flags;
      unsigned OpSize = Flags.isByVal() ?
        Flags.getByValSize() : VA.getValVT().getStoreSize();

      // FIXME: We can have better than the minimum byval required alignment.
      Alignment =
          Flags.isByVal()
              ? Flags.getNonZeroByValAlign()
              : commonAlignment(Subtarget->getStackAlignment(), Offset);

      Offset = Offset + FPDiff;
      int FI = MFI.CreateFixedObject(OpSize, Offset, true);

      DstAddr = DAG.getFrameIndex(FI, PtrVT);
      DstInfo = MachinePointerInfo::getFixedStack(MF, FI);

      // Make sure any stack arguments overlapping with where we're storing
      // are loaded before this eventual operation. Otherwise they'll be
      // clobbered.

      // FIXME: Why is this really necessary? This seems to just result in a
      // lot of code to copy the stack and write them back to the same
      // locations, which are supposed to be immutable?
      Chain = addTokenForArgument(Chain, DAG, MFI, FI);
    } else {
      // Stores to the argument stack area are relative to the stack pointer.
      SDValue SP = DAG.getCopyFromReg(Chain, DL, Info->getStackPtrOffsetReg(),
                                      MVT::i32);
      DstAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, SP, PtrOff);
      DstInfo = MachinePointerInfo::getStack(MF, LocMemOffset);
      Alignment =
          commonAlignment(Subtarget->getStackAlignment(), LocMemOffset);
    }

    if (Outs[i].Flags.isByVal()) {
      SDValue SizeNode =
          DAG.getConstant(Outs[i].Flags.getByValSize(), DL, MVT::i32);
      SDValue Cpy =
          DAG.getMemcpy(Chain, DL, DstAddr, Arg, SizeNode,
                        Outs[i].Flags.getNonZeroByValAlign(),
                        /*isVol = */ false, /*AlwaysInline = */ true,
                        /*isTailCall = */ false, DstInfo,
                        MachinePointerInfo(AMDGPUAS::PRIVATE_ADDRESS));

      MemOpChains.push_back(Cpy);
    } else {
      SDValue Store =
          DAG.getStore(Chain, DL, Arg, DstAddr, DstInfo, Alignment);
      MemOpChains.push_back(Store);
    }
  }
}

if (!AMDGPUTargetMachine::EnableFixedFunctionABI &&
    CallConv != CallingConv::AMDGPU_Gfx) {
  // Copy special input registers after user input arguments.
  passSpecialInputs(CLI, CCInfo, *Info, RegsToPass, MemOpChains, Chain);
}

if (!MemOpChains.empty())
  Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, MemOpChains);

// Build a sequence of copy-to-reg nodes chained together with token chain
// and flag operands which copy the outgoing args into the appropriate regs.
SDValue InFlag;
for (auto &RegToPass : RegsToPass) {
  Chain = DAG.getCopyToReg(Chain, DL, RegToPass.first,
                           RegToPass.second, InFlag);
  InFlag = Chain.getValue(1);
}


SDValue PhysReturnAddrReg;
if (IsTailCall) {
  // Since the return is being combined with the call, we need to pass on the
  // return address.

  const SIRegisterInfo *TRI = getSubtarget()->getRegisterInfo();
  SDValue ReturnAddrReg = CreateLiveInRegister(
    DAG, &AMDGPU::SReg_64RegClass, TRI->getReturnAddressReg(MF), MVT::i64);

  PhysReturnAddrReg = DAG.getRegister(TRI->getReturnAddressReg(MF),
                                      MVT::i64);
  Chain = DAG.getCopyToReg(Chain, DL, PhysReturnAddrReg, ReturnAddrReg, InFlag);
  InFlag = Chain.getValue(1);
}

// We don't usually want to end the call-sequence here because we would tidy
// the frame up *after* the call, however in the ABI-changing tail-call case
// we've carefully laid out the parameters so that when sp is reset they'll be
// in the correct location.
if (IsTailCall && !IsSibCall) {
  Chain = DAG.getCALLSEQ_END(Chain,
                             DAG.getTargetConstant(NumBytes, DL, MVT::i32),
                             DAG.getTargetConstant(0, DL, MVT::i32),
                             InFlag, DL);
  InFlag = Chain.getValue(1);
}

std::vector<SDValue> Ops;
Ops.push_back(Chain);
Ops.push_back(Callee);
// Add a redundant copy of the callee global which will not be legalized, as
// we need direct access to the callee later.
if (GlobalAddressSDNode *GSD = dyn_cast<GlobalAddressSDNode>(Callee)) {
  const GlobalValue *GV = GSD->getGlobal();
  Ops.push_back(DAG.getTargetGlobalAddress(GV, DL, MVT::i64));
} else {
  Ops.push_back(DAG.getTargetConstant(0, DL, MVT::i64));
}

if (IsTailCall) {
  // Each tail call may have to adjust the stack by a different amount, so
  // this information must travel along with the operation for eventual
  // consumption by emitEpilogue.
  Ops.push_back(DAG.getTargetConstant(FPDiff, DL, MVT::i32));

  Ops.push_back(PhysReturnAddrReg);
}

// Add argument registers to the end of the list so that they are known live
// into the call.
for (auto &RegToPass : RegsToPass) {
  Ops.push_back(DAG.getRegister(RegToPass.first,
                                RegToPass.second.getValueType()));
}

// Add a register mask operand representing the call-preserved registers.

auto *TRI = static_cast<const SIRegisterInfo*>(Subtarget->getRegisterInfo());
const uint32_t *Mask = TRI->getCallPreservedMask(MF, CallConv);
assert(Mask && "Missing call preserved mask for calling convention")((void)0);
Ops.push_back(DAG.getRegisterMask(Mask));

if (InFlag.getNode())
  Ops.push_back(InFlag);

SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);

// If we're doing a tall call, use a TC_RETURN here rather than an
// actual call instruction.
if (IsTailCall) {
  MFI.setHasTailCall();
  return DAG.getNode(AMDGPUISD::TC_RETURN, DL, NodeTys, Ops);
}

// Returns a chain and a flag for retval copy to use.
SDValue Call = DAG.getNode(AMDGPUISD::CALL, DL, NodeTys, Ops);
Chain = Call.getValue(0);
InFlag = Call.getValue(1);

uint64_t CalleePopBytes = NumBytes;
Chain = DAG.getCALLSEQ_END(Chain, DAG.getTargetConstant(0, DL, MVT::i32),
                           DAG.getTargetConstant(CalleePopBytes, DL, MVT::i32),
                           InFlag, DL);
if (!Ins.empty())
  InFlag = Chain.getValue(1);

// Handle result values, copying them out of physregs into vregs that we
// return.
return LowerCallResult(Chain, InFlag, CallConv, IsVarArg, Ins, DL, DAG,
                       InVals, IsThisReturn,
                       IsThisReturn ? OutVals[0] : SDValue());
3304}

3306// This is identical to the default implementation in ExpandDYNAMIC_STACKALLOC,
3307// except for applying the wave size scale to the increment amount.
3308SDValue SITargetLowering::lowerDYNAMIC_STACKALLOCImpl(
  SDValue Op, SelectionDAG &DAG) const {
const MachineFunction &MF = DAG.getMachineFunction();
const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();

SDLoc dl(Op);
EVT VT = Op.getValueType();
SDValue Tmp1 = Op;
SDValue Tmp2 = Op.getValue(1);
SDValue Tmp3 = Op.getOperand(2);
SDValue Chain = Tmp1.getOperand(0);

Register SPReg = Info->getStackPtrOffsetReg();

// Chain the dynamic stack allocation so that it doesn't modify the stack
// pointer when other instructions are using the stack.
Chain = DAG.getCALLSEQ_START(Chain, 0, 0, dl);

SDValue Size  = Tmp2.getOperand(1);
SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, VT);
Chain = SP.getValue(1);
MaybeAlign Alignment = cast<ConstantSDNode>(Tmp3)->getMaybeAlignValue();
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
const TargetFrameLowering *TFL = ST.getFrameLowering();
unsigned Opc =
  TFL->getStackGrowthDirection() == TargetFrameLowering::StackGrowsUp ?
  ISD::ADD : ISD::SUB;

SDValue ScaledSize = DAG.getNode(
    ISD::SHL, dl, VT, Size,
    DAG.getConstant(ST.getWavefrontSizeLog2(), dl, MVT::i32));

Align StackAlign = TFL->getStackAlign();
Tmp1 = DAG.getNode(Opc, dl, VT, SP, ScaledSize); // Value
if (Alignment && *Alignment > StackAlign) {
  Tmp1 = DAG.getNode(ISD::AND, dl, VT, Tmp1,
                     DAG.getConstant(-(uint64_t)Alignment->value()
                                         << ST.getWavefrontSizeLog2(),
                                     dl, VT));
}

Chain = DAG.getCopyToReg(Chain, dl, SPReg, Tmp1);    // Output chain
Tmp2 = DAG.getCALLSEQ_END(
    Chain, DAG.getIntPtrConstant(0, dl, true),
    DAG.getIntPtrConstant(0, dl, true), SDValue(), dl);

return DAG.getMergeValues({Tmp1, Tmp2}, dl);
3355}

3357SDValue SITargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
                                                SelectionDAG &DAG) const {
// We only handle constant sizes here to allow non-entry block, static sized
// allocas. A truly dynamic value is more difficult to support because we
// don't know if the size value is uniform or not. If the size isn't uniform,
// we would need to do a wave reduction to get the maximum size to know how
// much to increment the uniform stack pointer.
SDValue Size = Op.getOperand(1);
if (isa<ConstantSDNode>(Size))
    return lowerDYNAMIC_STACKALLOCImpl(Op, DAG); // Use "generic" expansion.

return AMDGPUTargetLowering::LowerDYNAMIC_STACKALLOC(Op, DAG);
3369}

3371Register SITargetLowering::getRegisterByName(const char* RegName, LLT VT,
                                           const MachineFunction &MF) const {
Register Reg = StringSwitch<Register>(RegName)
  .Case("m0", AMDGPU::M0)
  .Case("exec", AMDGPU::EXEC)
  .Case("exec_lo", AMDGPU::EXEC_LO)
  .Case("exec_hi", AMDGPU::EXEC_HI)
  .Case("flat_scratch", AMDGPU::FLAT_SCR)
  .Case("flat_scratch_lo", AMDGPU::FLAT_SCR_LO)
  .Case("flat_scratch_hi", AMDGPU::FLAT_SCR_HI)
  .Default(Register());

if (Reg == AMDGPU::NoRegister) {
  report_fatal_error(Twine("invalid register name \""
                           + StringRef(RegName)  + "\"."));

}

if (!Subtarget->hasFlatScrRegister() &&
     Subtarget->getRegisterInfo()->regsOverlap(Reg, AMDGPU::FLAT_SCR)) {
  report_fatal_error(Twine("invalid register \""
                           + StringRef(RegName)  + "\" for subtarget."));
}

switch (Reg) {
case AMDGPU::M0:
case AMDGPU::EXEC_LO:
case AMDGPU::EXEC_HI:
case AMDGPU::FLAT_SCR_LO:
case AMDGPU::FLAT_SCR_HI:
  if (VT.getSizeInBits() == 32)
    return Reg;
  break;
case AMDGPU::EXEC:
case AMDGPU::FLAT_SCR:
  if (VT.getSizeInBits() == 64)
    return Reg;
  break;
default:
  llvm_unreachable("missing register type checking")__builtin_unreachable();
}

report_fatal_error(Twine("invalid type for register \""
                         + StringRef(RegName) + "\"."));
3415}

3417// If kill is not the last instruction, split the block so kill is always a
3418// proper terminator.
3419MachineBasicBlock *
3420SITargetLowering::splitKillBlock(MachineInstr &MI,
                               MachineBasicBlock *BB) const {
MachineBasicBlock *SplitBB = BB->splitAt(MI, false /*UpdateLiveIns*/);
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
MI.setDesc(TII->getKillTerminatorFromPseudo(MI.getOpcode()));
return SplitBB;
3426}

3428// Split block \p MBB at \p MI, as to insert a loop. If \p InstInLoop is true,
3429// \p MI will be the only instruction in the loop body block. Otherwise, it will
3430// be the first instruction in the remainder block.
3431//
3432/// \returns { LoopBody, Remainder }
3433static std::pair<MachineBasicBlock *, MachineBasicBlock *>
3434splitBlockForLoop(MachineInstr &MI, MachineBasicBlock &MBB, bool InstInLoop) {
MachineFunction *MF = MBB.getParent();
MachineBasicBlock::iterator I(&MI);

// To insert the loop we need to split the block. Move everything after this
// point to a new block, and insert a new empty block between the two.
MachineBasicBlock *LoopBB = MF->CreateMachineBasicBlock();
MachineBasicBlock *RemainderBB = MF->CreateMachineBasicBlock();
MachineFunction::iterator MBBI(MBB);
++MBBI;

MF->insert(MBBI, LoopBB);
MF->insert(MBBI, RemainderBB);

LoopBB->addSuccessor(LoopBB);
LoopBB->addSuccessor(RemainderBB);

// Move the rest of the block into a new block.
RemainderBB->transferSuccessorsAndUpdatePHIs(&MBB);

if (InstInLoop) {
  auto Next = std::next(I);

  // Move instruction to loop body.
  LoopBB->splice(LoopBB->begin(), &MBB, I, Next);

  // Move the rest of the block.
  RemainderBB->splice(RemainderBB->begin(), &MBB, Next, MBB.end());
} else {
  RemainderBB->splice(RemainderBB->begin(), &MBB, I, MBB.end());
}

MBB.addSuccessor(LoopBB);

return std::make_pair(LoopBB, RemainderBB);
3469}

3471/// Insert \p MI into a BUNDLE with an S_WAITCNT 0 immediately following it.
3472void SITargetLowering::bundleInstWithWaitcnt(MachineInstr &MI) const {
MachineBasicBlock *MBB = MI.getParent();
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
auto I = MI.getIterator();
auto E = std::next(I);

BuildMI(*MBB, E, MI.getDebugLoc(), TII->get(AMDGPU::S_WAITCNT))
  .addImm(0);

MIBundleBuilder Bundler(*MBB, I, E);
finalizeBundle(*MBB, Bundler.begin());
3483}

3485MachineBasicBlock *
3486SITargetLowering::emitGWSMemViolTestLoop(MachineInstr &MI,
                                       MachineBasicBlock *BB) const {
const DebugLoc &DL = MI.getDebugLoc();

MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();

MachineBasicBlock *LoopBB;
MachineBasicBlock *RemainderBB;
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();

// Apparently kill flags are only valid if the def is in the same block?
if (MachineOperand *Src = TII->getNamedOperand(MI, AMDGPU::OpName::data0))
  Src->setIsKill(false);

std::tie(LoopBB, RemainderBB) = splitBlockForLoop(MI, *BB, true);

MachineBasicBlock::iterator I = LoopBB->end();

const unsigned EncodedReg = AMDGPU::Hwreg::encodeHwreg(
  AMDGPU::Hwreg::ID_TRAPSTS, AMDGPU::Hwreg::OFFSET_MEM_VIOL, 1);

// Clear TRAP_STS.MEM_VIOL
BuildMI(*LoopBB, LoopBB->begin(), DL, TII->get(AMDGPU::S_SETREG_IMM32_B32))
  .addImm(0)
  .addImm(EncodedReg);

bundleInstWithWaitcnt(MI);

Register Reg = MRI.createVirtualRegister(&AMDGPU::SReg_32_XM0RegClass);

// Load and check TRAP_STS.MEM_VIOL
BuildMI(*LoopBB, I, DL, TII->get(AMDGPU::S_GETREG_B32), Reg)
  .addImm(EncodedReg);

// FIXME: Do we need to use an isel pseudo that may clobber scc?
BuildMI(*LoopBB, I, DL, TII->get(AMDGPU::S_CMP_LG_U32))
  .addReg(Reg, RegState::Kill)
  .addImm(0);
BuildMI(*LoopBB, I, DL, TII->get(AMDGPU::S_CBRANCH_SCC1))
  .addMBB(LoopBB);

return RemainderBB;
3528}

3530// Do a v_movrels_b32 or v_movreld_b32 for each unique value of \p IdxReg in the
3531// wavefront. If the value is uniform and just happens to be in a VGPR, this
3532// will only do one iteration. In the worst case, this will loop 64 times.
3533//
3534// TODO: Just use v_readlane_b32 if we know the VGPR has a uniform value.
3535static MachineBasicBlock::iterator
3536emitLoadM0FromVGPRLoop(const SIInstrInfo *TII, MachineRegisterInfo &MRI,
                     MachineBasicBlock &OrigBB, MachineBasicBlock &LoopBB,
                     const DebugLoc &DL, const MachineOperand &Idx,
                     unsigned InitReg, unsigned ResultReg, unsigned PhiReg,
                     unsigned InitSaveExecReg, int Offset, bool UseGPRIdxMode,
                     Register &SGPRIdxReg) {

MachineFunction *MF = OrigBB.getParent();
const GCNSubtarget &ST = MF->getSubtarget<GCNSubtarget>();
const SIRegisterInfo *TRI = ST.getRegisterInfo();
MachineBasicBlock::iterator I = LoopBB.begin();

const TargetRegisterClass *BoolRC = TRI->getBoolRC();
Register PhiExec = MRI.createVirtualRegister(BoolRC);
Register NewExec = MRI.createVirtualRegister(BoolRC);
Register CurrentIdxReg = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
Register CondReg = MRI.createVirtualRegister(BoolRC);

BuildMI(LoopBB, I, DL, TII->get(TargetOpcode::PHI), PhiReg)
  .addReg(InitReg)
  .addMBB(&OrigBB)
  .addReg(ResultReg)
  .addMBB(&LoopBB);

BuildMI(LoopBB, I, DL, TII->get(TargetOpcode::PHI), PhiExec)
  .addReg(InitSaveExecReg)
  .addMBB(&OrigBB)
  .addReg(NewExec)
  .addMBB(&LoopBB);

// Read the next variant <- also loop target.
BuildMI(LoopBB, I, DL, TII->get(AMDGPU::V_READFIRSTLANE_B32), CurrentIdxReg)
    .addReg(Idx.getReg(), getUndefRegState(Idx.isUndef()));

// Compare the just read M0 value to all possible Idx values.
BuildMI(LoopBB, I, DL, TII->get(AMDGPU::V_CMP_EQ_U32_e64), CondReg)
    .addReg(CurrentIdxReg)
    .addReg(Idx.getReg(), 0, Idx.getSubReg());

// Update EXEC, save the original EXEC value to VCC.
BuildMI(LoopBB, I, DL, TII->get(ST.isWave32() ? AMDGPU::S_AND_SAVEEXEC_B32
                                              : AMDGPU::S_AND_SAVEEXEC_B64),
        NewExec)
  .addReg(CondReg, RegState::Kill);

MRI.setSimpleHint(NewExec, CondReg);

if (UseGPRIdxMode) {
  if (Offset == 0) {
    SGPRIdxReg = CurrentIdxReg;
  } else {
    SGPRIdxReg = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
    BuildMI(LoopBB, I, DL, TII->get(AMDGPU::S_ADD_I32), SGPRIdxReg)
        .addReg(CurrentIdxReg, RegState::Kill)
        .addImm(Offset);
  }
} else {
  // Move index from VCC into M0
  if (Offset == 0) {
    BuildMI(LoopBB, I, DL, TII->get(AMDGPU::S_MOV_B32), AMDGPU::M0)
      .addReg(CurrentIdxReg, RegState::Kill);
  } else {
    BuildMI(LoopBB, I, DL, TII->get(AMDGPU::S_ADD_I32), AMDGPU::M0)
      .addReg(CurrentIdxReg, RegState::Kill)
      .addImm(Offset);
  }
}

// Update EXEC, switch all done bits to 0 and all todo bits to 1.
unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
MachineInstr *InsertPt =
  BuildMI(LoopBB, I, DL, TII->get(ST.isWave32() ? AMDGPU::S_XOR_B32_term
                                                : AMDGPU::S_XOR_B64_term), Exec)
    .addReg(Exec)
    .addReg(NewExec);

// XXX - s_xor_b64 sets scc to 1 if the result is nonzero, so can we use
// s_cbranch_scc0?

// Loop back to V_READFIRSTLANE_B32 if there are still variants to cover.
BuildMI(LoopBB, I, DL, TII->get(AMDGPU::S_CBRANCH_EXECNZ))
  .addMBB(&LoopBB);

return InsertPt->getIterator();
3620}

3622// This has slightly sub-optimal regalloc when the source vector is killed by
3623// the read. The register allocator does not understand that the kill is
3624// per-workitem, so is kept alive for the whole loop so we end up not re-using a
3625// subregister from it, using 1 more VGPR than necessary. This was saved when
3626// this was expanded after register allocation.
3627static MachineBasicBlock::iterator
3628loadM0FromVGPR(const SIInstrInfo *TII, MachineBasicBlock &MBB, MachineInstr &MI,
             unsigned InitResultReg, unsigned PhiReg, int Offset,
             bool UseGPRIdxMode, Register &SGPRIdxReg) {
MachineFunction *MF = MBB.getParent();
const GCNSubtarget &ST = MF->getSubtarget<GCNSubtarget>();
const SIRegisterInfo *TRI = ST.getRegisterInfo();
MachineRegisterInfo &MRI = MF->getRegInfo();
const DebugLoc &DL = MI.getDebugLoc();
MachineBasicBlock::iterator I(&MI);

const auto *BoolXExecRC = TRI->getRegClass(AMDGPU::SReg_1_XEXECRegClassID);
Register DstReg = MI.getOperand(0).getReg();
Register SaveExec = MRI.createVirtualRegister(BoolXExecRC);
Register TmpExec = MRI.createVirtualRegister(BoolXExecRC);
unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
unsigned MovExecOpc = ST.isWave32() ? AMDGPU::S_MOV_B32 : AMDGPU::S_MOV_B64;

BuildMI(MBB, I, DL, TII->get(TargetOpcode::IMPLICIT_DEF), TmpExec);

// Save the EXEC mask
BuildMI(MBB, I, DL, TII->get(MovExecOpc), SaveExec)
  .addReg(Exec);

MachineBasicBlock *LoopBB;
MachineBasicBlock *RemainderBB;
std::tie(LoopBB, RemainderBB) = splitBlockForLoop(MI, MBB, false);

const MachineOperand *Idx = TII->getNamedOperand(MI, AMDGPU::OpName::idx);

auto InsPt = emitLoadM0FromVGPRLoop(TII, MRI, MBB, *LoopBB, DL, *Idx,
                                    InitResultReg, DstReg, PhiReg, TmpExec,
                                    Offset, UseGPRIdxMode, SGPRIdxReg);

MachineBasicBlock* LandingPad = MF->CreateMachineBasicBlock();
MachineFunction::iterator MBBI(LoopBB);
++MBBI;
MF->insert(MBBI, LandingPad);
LoopBB->removeSuccessor(RemainderBB);
LandingPad->addSuccessor(RemainderBB);
LoopBB->addSuccessor(LandingPad);
MachineBasicBlock::iterator First = LandingPad->begin();
BuildMI(*LandingPad, First, DL, TII->get(MovExecOpc), Exec)
  .addReg(SaveExec);

return InsPt;
3673}

3675// Returns subreg index, offset
3676static std::pair<unsigned, int>
3677computeIndirectRegAndOffset(const SIRegisterInfo &TRI,
                          const TargetRegisterClass *SuperRC,
                          unsigned VecReg,
                          int Offset) {
int NumElts = TRI.getRegSizeInBits(*SuperRC) / 32;

// Skip out of bounds offsets, or else we would end up using an undefined
// register.
if (Offset >= NumElts || Offset < 0)
  return std::make_pair(AMDGPU::sub0, Offset);

return std::make_pair(SIRegisterInfo::getSubRegFromChannel(Offset), 0);
3689}

3691static void setM0ToIndexFromSGPR(const SIInstrInfo *TII,
                               MachineRegisterInfo &MRI, MachineInstr &MI,
                               int Offset) {
MachineBasicBlock *MBB = MI.getParent();
const DebugLoc &DL = MI.getDebugLoc();
MachineBasicBlock::iterator I(&MI);

const MachineOperand *Idx = TII->getNamedOperand(MI, AMDGPU::OpName::idx);

assert(Idx->getReg() != AMDGPU::NoRegister)((void)0);

if (Offset == 0) {
  BuildMI(*MBB, I, DL, TII->get(AMDGPU::S_MOV_B32), AMDGPU::M0).add(*Idx);
} else {
  BuildMI(*MBB, I, DL, TII->get(AMDGPU::S_ADD_I32), AMDGPU::M0)
      .add(*Idx)
      .addImm(Offset);
}
3709}

3711static Register getIndirectSGPRIdx(const SIInstrInfo *TII,
                                 MachineRegisterInfo &MRI, MachineInstr &MI,
                                 int Offset) {
MachineBasicBlock *MBB = MI.getParent();
const DebugLoc &DL = MI.getDebugLoc();
MachineBasicBlock::iterator I(&MI);

const MachineOperand *Idx = TII->getNamedOperand(MI, AMDGPU::OpName::idx);

if (Offset == 0)
  return Idx->getReg();

Register Tmp = MRI.createVirtualRegister(&AMDGPU::SReg_32_XM0RegClass);
BuildMI(*MBB, I, DL, TII->get(AMDGPU::S_ADD_I32), Tmp)
    .add(*Idx)
    .addImm(Offset);
return Tmp;
3728}

3730static MachineBasicBlock *emitIndirectSrc(MachineInstr &MI,
                                        MachineBasicBlock &MBB,
                                        const GCNSubtarget &ST) {
const SIInstrInfo *TII = ST.getInstrInfo();
const SIRegisterInfo &TRI = TII->getRegisterInfo();
MachineFunction *MF = MBB.getParent();
MachineRegisterInfo &MRI = MF->getRegInfo();

Register Dst = MI.getOperand(0).getReg();
const MachineOperand *Idx = TII->getNamedOperand(MI, AMDGPU::OpName::idx);
Register SrcReg = TII->getNamedOperand(MI, AMDGPU::OpName::src)->getReg();
int Offset = TII->getNamedOperand(MI, AMDGPU::OpName::offset)->getImm();

const TargetRegisterClass *VecRC = MRI.getRegClass(SrcReg);
const TargetRegisterClass *IdxRC = MRI.getRegClass(Idx->getReg());

unsigned SubReg;
std::tie(SubReg, Offset)
  = computeIndirectRegAndOffset(TRI, VecRC, SrcReg, Offset);

const bool UseGPRIdxMode = ST.useVGPRIndexMode();

// Check for a SGPR index.
if (TII->getRegisterInfo().isSGPRClass(IdxRC)) {
  MachineBasicBlock::iterator I(&MI);
  const DebugLoc &DL = MI.getDebugLoc();

  if (UseGPRIdxMode) {
    // TODO: Look at the uses to avoid the copy. This may require rescheduling
    // to avoid interfering with other uses, so probably requires a new
    // optimization pass.
    Register Idx = getIndirectSGPRIdx(TII, MRI, MI, Offset);

    const MCInstrDesc &GPRIDXDesc =
        TII->getIndirectGPRIDXPseudo(TRI.getRegSizeInBits(*VecRC), true);
    BuildMI(MBB, I, DL, GPRIDXDesc, Dst)
        .addReg(SrcReg)
        .addReg(Idx)
        .addImm(SubReg);
  } else {
    setM0ToIndexFromSGPR(TII, MRI, MI, Offset);

    BuildMI(MBB, I, DL, TII->get(AMDGPU::V_MOVRELS_B32_e32), Dst)
      .addReg(SrcReg, 0, SubReg)
      .addReg(SrcReg, RegState::Implicit);
  }

  MI.eraseFromParent();

  return &MBB;
}

// Control flow needs to be inserted if indexing with a VGPR.
const DebugLoc &DL = MI.getDebugLoc();
MachineBasicBlock::iterator I(&MI);

Register PhiReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
Register InitReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);

BuildMI(MBB, I, DL, TII->get(TargetOpcode::IMPLICIT_DEF), InitReg);

Register SGPRIdxReg;
auto InsPt = loadM0FromVGPR(TII, MBB, MI, InitReg, PhiReg, Offset,
                            UseGPRIdxMode, SGPRIdxReg);

MachineBasicBlock *LoopBB = InsPt->getParent();

if (UseGPRIdxMode) {
  const MCInstrDesc &GPRIDXDesc =
      TII->getIndirectGPRIDXPseudo(TRI.getRegSizeInBits(*VecRC), true);

  BuildMI(*LoopBB, InsPt, DL, GPRIDXDesc, Dst)
      .addReg(SrcReg)
      .addReg(SGPRIdxReg)
      .addImm(SubReg);
} else {
  BuildMI(*LoopBB, InsPt, DL, TII->get(AMDGPU::V_MOVRELS_B32_e32), Dst)
    .addReg(SrcReg, 0, SubReg)
    .addReg(SrcReg, RegState::Implicit);
}

MI.eraseFromParent();

return LoopBB;
3814}

3816static MachineBasicBlock *emitIndirectDst(MachineInstr &MI,
                                        MachineBasicBlock &MBB,
                                        const GCNSubtarget &ST) {
const SIInstrInfo *TII = ST.getInstrInfo();
const SIRegisterInfo &TRI = TII->getRegisterInfo();
MachineFunction *MF = MBB.getParent();
MachineRegisterInfo &MRI = MF->getRegInfo();

Register Dst = MI.getOperand(0).getReg();
const MachineOperand *SrcVec = TII->getNamedOperand(MI, AMDGPU::OpName::src);
const MachineOperand *Idx = TII->getNamedOperand(MI, AMDGPU::OpName::idx);
const MachineOperand *Val = TII->getNamedOperand(MI, AMDGPU::OpName::val);
int Offset = TII->getNamedOperand(MI, AMDGPU::OpName::offset)->getImm();
const TargetRegisterClass *VecRC = MRI.getRegClass(SrcVec->getReg());
const TargetRegisterClass *IdxRC = MRI.getRegClass(Idx->getReg());

// This can be an immediate, but will be folded later.
assert(Val->getReg())((void)0);

unsigned SubReg;
std::tie(SubReg, Offset) = computeIndirectRegAndOffset(TRI, VecRC,
                                                       SrcVec->getReg(),
                                                       Offset);
const bool UseGPRIdxMode = ST.useVGPRIndexMode();

if (Idx->getReg() == AMDGPU::NoRegister) {
  MachineBasicBlock::iterator I(&MI);
  const DebugLoc &DL = MI.getDebugLoc();

  assert(Offset == 0)((void)0);

  BuildMI(MBB, I, DL, TII->get(TargetOpcode::INSERT_SUBREG), Dst)
      .add(*SrcVec)
      .add(*Val)
      .addImm(SubReg);

  MI.eraseFromParent();
  return &MBB;
}

// Check for a SGPR index.
if (TII->getRegisterInfo().isSGPRClass(IdxRC)) {
  MachineBasicBlock::iterator I(&MI);
  const DebugLoc &DL = MI.getDebugLoc();

  if (UseGPRIdxMode) {
    Register Idx = getIndirectSGPRIdx(TII, MRI, MI, Offset);

    const MCInstrDesc &GPRIDXDesc =
        TII->getIndirectGPRIDXPseudo(TRI.getRegSizeInBits(*VecRC), false);
    BuildMI(MBB, I, DL, GPRIDXDesc, Dst)
        .addReg(SrcVec->getReg())
        .add(*Val)
        .addReg(Idx)
        .addImm(SubReg);
  } else {
    setM0ToIndexFromSGPR(TII, MRI, MI, Offset);

    const MCInstrDesc &MovRelDesc = TII->getIndirectRegWriteMovRelPseudo(
        TRI.getRegSizeInBits(*VecRC), 32, false);
    BuildMI(MBB, I, DL, MovRelDesc, Dst)
        .addReg(SrcVec->getReg())
        .add(*Val)
        .addImm(SubReg);
  }
  MI.eraseFromParent();
  return &MBB;
}

// Control flow needs to be inserted if indexing with a VGPR.
if (Val->isReg())
  MRI.clearKillFlags(Val->getReg());

const DebugLoc &DL = MI.getDebugLoc();

Register PhiReg = MRI.createVirtualRegister(VecRC);

Register SGPRIdxReg;
auto InsPt = loadM0FromVGPR(TII, MBB, MI, SrcVec->getReg(), PhiReg, Offset,
                            UseGPRIdxMode, SGPRIdxReg);
MachineBasicBlock *LoopBB = InsPt->getParent();

if (UseGPRIdxMode) {
  const MCInstrDesc &GPRIDXDesc =
      TII->getIndirectGPRIDXPseudo(TRI.getRegSizeInBits(*VecRC), false);

  BuildMI(*LoopBB, InsPt, DL, GPRIDXDesc, Dst)
      .addReg(PhiReg)
      .add(*Val)
      .addReg(SGPRIdxReg)
      .addImm(AMDGPU::sub0);
} else {
  const MCInstrDesc &MovRelDesc = TII->getIndirectRegWriteMovRelPseudo(
      TRI.getRegSizeInBits(*VecRC), 32, false);
  BuildMI(*LoopBB, InsPt, DL, MovRelDesc, Dst)
      .addReg(PhiReg)
      .add(*Val)
      .addImm(AMDGPU::sub0);
}

MI.eraseFromParent();
return LoopBB;
3918}

3920MachineBasicBlock *SITargetLowering::EmitInstrWithCustomInserter(
MachineInstr &MI, MachineBasicBlock *BB) const {

const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
MachineFunction *MF = BB->getParent();
SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();

switch (MI.getOpcode()) {
case AMDGPU::S_UADDO_PSEUDO:
case AMDGPU::S_USUBO_PSEUDO: {
  const DebugLoc &DL = MI.getDebugLoc();
  MachineOperand &Dest0 = MI.getOperand(0);
  MachineOperand &Dest1 = MI.getOperand(1);
  MachineOperand &Src0 = MI.getOperand(2);
  MachineOperand &Src1 = MI.getOperand(3);

  unsigned Opc = (MI.getOpcode() == AMDGPU::S_UADDO_PSEUDO)
                     ? AMDGPU::S_ADD_I32
                     : AMDGPU::S_SUB_I32;
  BuildMI(*BB, MI, DL, TII->get(Opc), Dest0.getReg()).add(Src0).add(Src1);

  BuildMI(*BB, MI, DL, TII->get(AMDGPU::S_CSELECT_B64), Dest1.getReg())
      .addImm(1)
      .addImm(0);

  MI.eraseFromParent();
  return BB;
}
case AMDGPU::S_ADD_U64_PSEUDO:
case AMDGPU::S_SUB_U64_PSEUDO: {
  MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
  const GCNSubtarget &ST = MF->getSubtarget<GCNSubtarget>();
  const SIRegisterInfo *TRI = ST.getRegisterInfo();
  const TargetRegisterClass *BoolRC = TRI->getBoolRC();
  const DebugLoc &DL = MI.getDebugLoc();

  MachineOperand &Dest = MI.getOperand(0);
  MachineOperand &Src0 = MI.getOperand(1);
  MachineOperand &Src1 = MI.getOperand(2);

  Register DestSub0 = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);
  Register DestSub1 = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);

  MachineOperand Src0Sub0 = TII->buildExtractSubRegOrImm(
      MI, MRI, Src0, BoolRC, AMDGPU::sub0, &AMDGPU::SReg_32RegClass);
  MachineOperand Src0Sub1 = TII->buildExtractSubRegOrImm(
      MI, MRI, Src0, BoolRC, AMDGPU::sub1, &AMDGPU::SReg_32RegClass);

  MachineOperand Src1Sub0 = TII->buildExtractSubRegOrImm(
      MI, MRI, Src1, BoolRC, AMDGPU::sub0, &AMDGPU::SReg_32RegClass);
  MachineOperand Src1Sub1 = TII->buildExtractSubRegOrImm(
      MI, MRI, Src1, BoolRC, AMDGPU::sub1, &AMDGPU::SReg_32RegClass);

  bool IsAdd = (MI.getOpcode() == AMDGPU::S_ADD_U64_PSEUDO);

  unsigned LoOpc = IsAdd ? AMDGPU::S_ADD_U32 : AMDGPU::S_SUB_U32;
  unsigned HiOpc = IsAdd ? AMDGPU::S_ADDC_U32 : AMDGPU::S_SUBB_U32;
  BuildMI(*BB, MI, DL, TII->get(LoOpc), DestSub0).add(Src0Sub0).add(Src1Sub0);
  BuildMI(*BB, MI, DL, TII->get(HiOpc), DestSub1).add(Src0Sub1).add(Src1Sub1);
  BuildMI(*BB, MI, DL, TII->get(TargetOpcode::REG_SEQUENCE), Dest.getReg())
      .addReg(DestSub0)
      .addImm(AMDGPU::sub0)
      .addReg(DestSub1)
      .addImm(AMDGPU::sub1);
  MI.eraseFromParent();
  return BB;
}
case AMDGPU::V_ADD_U64_PSEUDO:
case AMDGPU::V_SUB_U64_PSEUDO: {
  MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
  const GCNSubtarget &ST = MF->getSubtarget<GCNSubtarget>();
  const SIRegisterInfo *TRI = ST.getRegisterInfo();
  const DebugLoc &DL = MI.getDebugLoc();

  bool IsAdd = (MI.getOpcode() == AMDGPU::V_ADD_U64_PSEUDO);

  const auto *CarryRC = TRI->getRegClass(AMDGPU::SReg_1_XEXECRegClassID);

  Register DestSub0 = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
  Register DestSub1 = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);

  Register CarryReg = MRI.createVirtualRegister(CarryRC);
  Register DeadCarryReg = MRI.createVirtualRegister(CarryRC);

  MachineOperand &Dest = MI.getOperand(0);
  MachineOperand &Src0 = MI.getOperand(1);
  MachineOperand &Src1 = MI.getOperand(2);

  const TargetRegisterClass *Src0RC = Src0.isReg()
                                          ? MRI.getRegClass(Src0.getReg())
                                          : &AMDGPU::VReg_64RegClass;
  const TargetRegisterClass *Src1RC = Src1.isReg()
                                          ? MRI.getRegClass(Src1.getReg())
                                          : &AMDGPU::VReg_64RegClass;

  const TargetRegisterClass *Src0SubRC =
      TRI->getSubRegClass(Src0RC, AMDGPU::sub0);
  const TargetRegisterClass *Src1SubRC =
      TRI->getSubRegClass(Src1RC, AMDGPU::sub1);

  MachineOperand SrcReg0Sub0 = TII->buildExtractSubRegOrImm(
      MI, MRI, Src0, Src0RC, AMDGPU::sub0, Src0SubRC);
  MachineOperand SrcReg1Sub0 = TII->buildExtractSubRegOrImm(
      MI, MRI, Src1, Src1RC, AMDGPU::sub0, Src1SubRC);

  MachineOperand SrcReg0Sub1 = TII->buildExtractSubRegOrImm(
      MI, MRI, Src0, Src0RC, AMDGPU::sub1, Src0SubRC);
  MachineOperand SrcReg1Sub1 = TII->buildExtractSubRegOrImm(
      MI, MRI, Src1, Src1RC, AMDGPU::sub1, Src1SubRC);

  unsigned LoOpc = IsAdd ? AMDGPU::V_ADD_CO_U32_e64 : AMDGPU::V_SUB_CO_U32_e64;
  MachineInstr *LoHalf = BuildMI(*BB, MI, DL, TII->get(LoOpc), DestSub0)
                             .addReg(CarryReg, RegState::Define)
                             .add(SrcReg0Sub0)
                             .add(SrcReg1Sub0)
                             .addImm(0); // clamp bit

  unsigned HiOpc = IsAdd ? AMDGPU::V_ADDC_U32_e64 : AMDGPU::V_SUBB_U32_e64;
  MachineInstr *HiHalf =
      BuildMI(*BB, MI, DL, TII->get(HiOpc), DestSub1)
          .addReg(DeadCarryReg, RegState::Define | RegState::Dead)
          .add(SrcReg0Sub1)
          .add(SrcReg1Sub1)
          .addReg(CarryReg, RegState::Kill)
          .addImm(0); // clamp bit

  BuildMI(*BB, MI, DL, TII->get(TargetOpcode::REG_SEQUENCE), Dest.getReg())
      .addReg(DestSub0)
      .addImm(AMDGPU::sub0)
      .addReg(DestSub1)
      .addImm(AMDGPU::sub1);
  TII->legalizeOperands(*LoHalf);
  TII->legalizeOperands(*HiHalf);
  MI.eraseFromParent();
  return BB;
}
case AMDGPU::S_ADD_CO_PSEUDO:
case AMDGPU::S_SUB_CO_PSEUDO: {
  // This pseudo has a chance to be selected
  // only from uniform add/subcarry node. All the VGPR operands
  // therefore assumed to be splat vectors.
  MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
  const GCNSubtarget &ST = MF->getSubtarget<GCNSubtarget>();
  const SIRegisterInfo *TRI = ST.getRegisterInfo();
  MachineBasicBlock::iterator MII = MI;
  const DebugLoc &DL = MI.getDebugLoc();
  MachineOperand &Dest = MI.getOperand(0);
  MachineOperand &CarryDest = MI.getOperand(1);
  MachineOperand &Src0 = MI.getOperand(2);
  MachineOperand &Src1 = MI.getOperand(3);
  MachineOperand &Src2 = MI.getOperand(4);
  unsigned Opc = (MI.getOpcode() == AMDGPU::S_ADD_CO_PSEUDO)
                     ? AMDGPU::S_ADDC_U32
                     : AMDGPU::S_SUBB_U32;
  if (Src0.isReg() && TRI->isVectorRegister(MRI, Src0.getReg())) {
    Register RegOp0 = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);
    BuildMI(*BB, MII, DL, TII->get(AMDGPU::V_READFIRSTLANE_B32), RegOp0)
        .addReg(Src0.getReg());
    Src0.setReg(RegOp0);
  }
  if (Src1.isReg() && TRI->isVectorRegister(MRI, Src1.getReg())) {
    Register RegOp1 = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);
    BuildMI(*BB, MII, DL, TII->get(AMDGPU::V_READFIRSTLANE_B32), RegOp1)
        .addReg(Src1.getReg());
    Src1.setReg(RegOp1);
  }
  Register RegOp2 = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);
  if (TRI->isVectorRegister(MRI, Src2.getReg())) {
    BuildMI(*BB, MII, DL, TII->get(AMDGPU::V_READFIRSTLANE_B32), RegOp2)
        .addReg(Src2.getReg());
    Src2.setReg(RegOp2);
  }

  const TargetRegisterClass *Src2RC = MRI.getRegClass(Src2.getReg());
  if (TRI->getRegSizeInBits(*Src2RC) == 64) {
    if (ST.hasScalarCompareEq64()) {
      BuildMI(*BB, MII, DL, TII->get(AMDGPU::S_CMP_LG_U64))
          .addReg(Src2.getReg())
          .addImm(0);
    } else {
      const TargetRegisterClass *SubRC =
          TRI->getSubRegClass(Src2RC, AMDGPU::sub0);
      MachineOperand Src2Sub0 = TII->buildExtractSubRegOrImm(
          MII, MRI, Src2, Src2RC, AMDGPU::sub0, SubRC);
      MachineOperand Src2Sub1 = TII->buildExtractSubRegOrImm(
          MII, MRI, Src2, Src2RC, AMDGPU::sub1, SubRC);
      Register Src2_32 = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass);

      BuildMI(*BB, MII, DL, TII->get(AMDGPU::S_OR_B32), Src2_32)
          .add(Src2Sub0)
          .add(Src2Sub1);

      BuildMI(*BB, MII, DL, TII->get(AMDGPU::S_CMP_LG_U32))
          .addReg(Src2_32, RegState::Kill)
          .addImm(0);
    }
  } else {
    BuildMI(*BB, MII, DL, TII->get(AMDGPU::S_CMPK_LG_U32))
        .addReg(Src2.getReg())
        .addImm(0);
  }

  BuildMI(*BB, MII, DL, TII->get(Opc), Dest.getReg()).add(Src0).add(Src1);

  BuildMI(*BB, MII, DL, TII->get(AMDGPU::COPY), CarryDest.getReg())
    .addReg(AMDGPU::SCC);
  MI.eraseFromParent();
  return BB;
}
case AMDGPU::SI_INIT_M0: {
  BuildMI(*BB, MI.getIterator(), MI.getDebugLoc(),
          TII->get(AMDGPU::S_MOV_B32), AMDGPU::M0)
      .add(MI.getOperand(0));
  MI.eraseFromParent();
  return BB;
}
case AMDGPU::GET_GROUPSTATICSIZE: {
  assert(getTargetMachine().getTargetTriple().getOS() == Triple::AMDHSA ||((void)0)
         getTargetMachine().getTargetTriple().getOS() == Triple::AMDPAL)((void)0);
  DebugLoc DL = MI.getDebugLoc();
  BuildMI(*BB, MI, DL, TII->get(AMDGPU::S_MOV_B32))
      .add(MI.getOperand(0))
      .addImm(MFI->getLDSSize());
  MI.eraseFromParent();
  return BB;
}
case AMDGPU::SI_INDIRECT_SRC_V1:
case AMDGPU::SI_INDIRECT_SRC_V2:
case AMDGPU::SI_INDIRECT_SRC_V4:
case AMDGPU::SI_INDIRECT_SRC_V8:
case AMDGPU::SI_INDIRECT_SRC_V16:
case AMDGPU::SI_INDIRECT_SRC_V32:
  return emitIndirectSrc(MI, *BB, *getSubtarget());
case AMDGPU::SI_INDIRECT_DST_V1:
case AMDGPU::SI_INDIRECT_DST_V2:
case AMDGPU::SI_INDIRECT_DST_V4:
case AMDGPU::SI_INDIRECT_DST_V8:
case AMDGPU::SI_INDIRECT_DST_V16:
case AMDGPU::SI_INDIRECT_DST_V32:
  return emitIndirectDst(MI, *BB, *getSubtarget());
case AMDGPU::SI_KILL_F32_COND_IMM_PSEUDO:
case AMDGPU::SI_KILL_I1_PSEUDO:
  return splitKillBlock(MI, BB);
case AMDGPU::V_CNDMASK_B64_PSEUDO: {
  MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
  const GCNSubtarget &ST = MF->getSubtarget<GCNSubtarget>();
  const SIRegisterInfo *TRI = ST.getRegisterInfo();

  Register Dst = MI.getOperand(0).getReg();
  Register Src0 = MI.getOperand(1).getReg();
  Register Src1 = MI.getOperand(2).getReg();
  const DebugLoc &DL = MI.getDebugLoc();
  Register SrcCond = MI.getOperand(3).getReg();

  Register DstLo = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
  Register DstHi = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
  const auto *CondRC = TRI->getRegClass(AMDGPU::SReg_1_XEXECRegClassID);
  Register SrcCondCopy = MRI.createVirtualRegister(CondRC);

  BuildMI(*BB, MI, DL, TII->get(AMDGPU::COPY), SrcCondCopy)
    .addReg(SrcCond);
  BuildMI(*BB, MI, DL, TII->get(AMDGPU::V_CNDMASK_B32_e64), DstLo)
    .addImm(0)
    .addReg(Src0, 0, AMDGPU::sub0)
    .addImm(0)
    .addReg(Src1, 0, AMDGPU::sub0)
    .addReg(SrcCondCopy);
  BuildMI(*BB, MI, DL, TII->get(AMDGPU::V_CNDMASK_B32_e64), DstHi)
    .addImm(0)
    .addReg(Src0, 0, AMDGPU::sub1)
    .addImm(0)
    .addReg(Src1, 0, AMDGPU::sub1)
    .addReg(SrcCondCopy);

  BuildMI(*BB, MI, DL, TII->get(AMDGPU::REG_SEQUENCE), Dst)
    .addReg(DstLo)
    .addImm(AMDGPU::sub0)
    .addReg(DstHi)
    .addImm(AMDGPU::sub1);
  MI.eraseFromParent();
  return BB;
}
case AMDGPU::SI_BR_UNDEF: {
  const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
  const DebugLoc &DL = MI.getDebugLoc();
  MachineInstr *Br = BuildMI(*BB, MI, DL, TII->get(AMDGPU::S_CBRANCH_SCC1))
                         .add(MI.getOperand(0));
  Br->getOperand(1).setIsUndef(true); // read undef SCC
  MI.eraseFromParent();
  return BB;
}
case AMDGPU::ADJCALLSTACKUP:
case AMDGPU::ADJCALLSTACKDOWN: {
  const SIMachineFunctionInfo *Info = MF->getInfo<SIMachineFunctionInfo>();
  MachineInstrBuilder MIB(*MF, &MI);
  MIB.addReg(Info->getStackPtrOffsetReg(), RegState::ImplicitDefine)
     .addReg(Info->getStackPtrOffsetReg(), RegState::Implicit);
  return BB;
}
case AMDGPU::SI_CALL_ISEL: {
  const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
  const DebugLoc &DL = MI.getDebugLoc();

  unsigned ReturnAddrReg = TII->getRegisterInfo().getReturnAddressReg(*MF);

  MachineInstrBuilder MIB;
  MIB = BuildMI(*BB, MI, DL, TII->get(AMDGPU::SI_CALL), ReturnAddrReg);

  for (unsigned I = 0, E = MI.getNumOperands(); I != E; ++I)
    MIB.add(MI.getOperand(I));

  MIB.cloneMemRefs(MI);
  MI.eraseFromParent();
  return BB;
}
case AMDGPU::V_ADD_CO_U32_e32:
case AMDGPU::V_SUB_CO_U32_e32:
case AMDGPU::V_SUBREV_CO_U32_e32: {
  // TODO: Define distinct V_*_I32_Pseudo instructions instead.
  const DebugLoc &DL = MI.getDebugLoc();
  unsigned Opc = MI.getOpcode();

  bool NeedClampOperand = false;
  if (TII->pseudoToMCOpcode(Opc) == -1) {
    Opc = AMDGPU::getVOPe64(Opc);
    NeedClampOperand = true;
  }

  auto I = BuildMI(*BB, MI, DL, TII->get(Opc), MI.getOperand(0).getReg());
  if (TII->isVOP3(*I)) {
    const GCNSubtarget &ST = MF->getSubtarget<GCNSubtarget>();
    const SIRegisterInfo *TRI = ST.getRegisterInfo();
    I.addReg(TRI->getVCC(), RegState::Define);
  }
  I.add(MI.getOperand(1))
   .add(MI.getOperand(2));
  if (NeedClampOperand)
    I.addImm(0); // clamp bit for e64 encoding

  TII->legalizeOperands(*I);

  MI.eraseFromParent();
  return BB;
}
case AMDGPU::DS_GWS_INIT:
case AMDGPU::DS_GWS_SEMA_BR:
case AMDGPU::DS_GWS_BARRIER:
  if (Subtarget->needsAlignedVGPRs()) {
    // Add implicit aligned super-reg to force alignment on the data operand.
    const DebugLoc &DL = MI.getDebugLoc();
    MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
    const SIRegisterInfo *TRI = Subtarget->getRegisterInfo();
    MachineOperand *Op = TII->getNamedOperand(MI, AMDGPU::OpName::data0);
    Register DataReg = Op->getReg();
    bool IsAGPR = TRI->isAGPR(MRI, DataReg);
    Register Undef = MRI.createVirtualRegister(
        IsAGPR ? &AMDGPU::AGPR_32RegClass : &AMDGPU::VGPR_32RegClass);
    BuildMI(*BB, MI, DL, TII->get(AMDGPU::IMPLICIT_DEF), Undef);
    Register NewVR =
        MRI.createVirtualRegister(IsAGPR ? &AMDGPU::AReg_64_Align2RegClass
                                         : &AMDGPU::VReg_64_Align2RegClass);
    BuildMI(*BB, MI, DL, TII->get(AMDGPU::REG_SEQUENCE), NewVR)
        .addReg(DataReg, 0, Op->getSubReg())
        .addImm(AMDGPU::sub0)
        .addReg(Undef)
        .addImm(AMDGPU::sub1);
    Op->setReg(NewVR);
    Op->setSubReg(AMDGPU::sub0);
    MI.addOperand(MachineOperand::CreateReg(NewVR, false, true));
  }
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case AMDGPU::DS_GWS_SEMA_V:
case AMDGPU::DS_GWS_SEMA_P:
case AMDGPU::DS_GWS_SEMA_RELEASE_ALL:
  // A s_waitcnt 0 is required to be the instruction immediately following.
  if (getSubtarget()->hasGWSAutoReplay()) {
    bundleInstWithWaitcnt(MI);
    return BB;
  }

  return emitGWSMemViolTestLoop(MI, BB);
case AMDGPU::S_SETREG_B32: {
  // Try to optimize cases that only set the denormal mode or rounding mode.
  //
  // If the s_setreg_b32 fully sets all of the bits in the rounding mode or
  // denormal mode to a constant, we can use s_round_mode or s_denorm_mode
  // instead.
  //
  // FIXME: This could be predicates on the immediate, but tablegen doesn't
  // allow you to have a no side effect instruction in the output of a
  // sideeffecting pattern.
  unsigned ID, Offset, Width;
  AMDGPU::Hwreg::decodeHwreg(MI.getOperand(1).getImm(), ID, Offset, Width);
  if (ID != AMDGPU::Hwreg::ID_MODE)
    return BB;

  const unsigned WidthMask = maskTrailingOnes<unsigned>(Width);
  const unsigned SetMask = WidthMask << Offset;

  if (getSubtarget()->hasDenormModeInst()) {
    unsigned SetDenormOp = 0;
    unsigned SetRoundOp = 0;

    // The dedicated instructions can only set the whole denorm or round mode
    // at once, not a subset of bits in either.
    if (SetMask ==
        (AMDGPU::Hwreg::FP_ROUND_MASK | AMDGPU::Hwreg::FP_DENORM_MASK)) {
      // If this fully sets both the round and denorm mode, emit the two
      // dedicated instructions for these.
      SetRoundOp = AMDGPU::S_ROUND_MODE;
      SetDenormOp = AMDGPU::S_DENORM_MODE;
    } else if (SetMask == AMDGPU::Hwreg::FP_ROUND_MASK) {
      SetRoundOp = AMDGPU::S_ROUND_MODE;
    } else if (SetMask == AMDGPU::Hwreg::FP_DENORM_MASK) {
      SetDenormOp = AMDGPU::S_DENORM_MODE;
    }

    if (SetRoundOp || SetDenormOp) {
      MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
      MachineInstr *Def = MRI.getVRegDef(MI.getOperand(0).getReg());
      if (Def && Def->isMoveImmediate() && Def->getOperand(1).isImm()) {
        unsigned ImmVal = Def->getOperand(1).getImm();
        if (SetRoundOp) {
          BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(SetRoundOp))
              .addImm(ImmVal & 0xf);

          // If we also have the denorm mode, get just the denorm mode bits.
          ImmVal >>= 4;
        }

        if (SetDenormOp) {
          BuildMI(*BB, MI, MI.getDebugLoc(), TII->get(SetDenormOp))
              .addImm(ImmVal & 0xf);
        }

        MI.eraseFromParent();
        return BB;
      }
    }
  }

  // If only FP bits are touched, used the no side effects pseudo.
  if ((SetMask & (AMDGPU::Hwreg::FP_ROUND_MASK |
                  AMDGPU::Hwreg::FP_DENORM_MASK)) == SetMask)
    MI.setDesc(TII->get(AMDGPU::S_SETREG_B32_mode));

  return BB;
}
default:
  return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
}
4371}

4373bool SITargetLowering::hasBitPreservingFPLogic(EVT VT) const {
return isTypeLegal(VT.getScalarType());
4375}

4377bool SITargetLowering::enableAggressiveFMAFusion(EVT VT) const {
// This currently forces unfolding various combinations of fsub into fma with
// free fneg'd operands. As long as we have fast FMA (controlled by
// isFMAFasterThanFMulAndFAdd), we should perform these.

// When fma is quarter rate, for f64 where add / sub are at best half rate,
// most of these combines appear to be cycle neutral but save on instruction
// count / code size.
return true;
4386}

4388EVT SITargetLowering::getSetCCResultType(const DataLayout &DL, LLVMContext &Ctx,
                                       EVT VT) const {
if (!VT.isVector()) {
  return MVT::i1;
}
return EVT::getVectorVT(Ctx, MVT::i1, VT.getVectorNumElements());
4394}

4396MVT SITargetLowering::getScalarShiftAmountTy(const DataLayout &, EVT VT) const {
// TODO: Should i16 be used always if legal? For now it would force VALU
// shifts.
return (VT == MVT::i16) ? MVT::i16 : MVT::i32;
4400}

4402LLT SITargetLowering::getPreferredShiftAmountTy(LLT Ty) const {
return (Ty.getScalarSizeInBits() <= 16 && Subtarget->has16BitInsts())
           ? Ty.changeElementSize(16)
           : Ty.changeElementSize(32);
4406}

4408// Answering this is somewhat tricky and depends on the specific device which
4409// have different rates for fma or all f64 operations.
4410//
4411// v_fma_f64 and v_mul_f64 always take the same number of cycles as each other
4412// regardless of which device (although the number of cycles differs between
4413// devices), so it is always profitable for f64.
4414//
4415// v_fma_f32 takes 4 or 16 cycles depending on the device, so it is profitable
4416// only on full rate devices. Normally, we should prefer selecting v_mad_f32
4417// which we can always do even without fused FP ops since it returns the same
4418// result as the separate operations and since it is always full
4419// rate. Therefore, we lie and report that it is not faster for f32. v_mad_f32
4420// however does not support denormals, so we do report fma as faster if we have
4421// a fast fma device and require denormals.
4422//
4423bool SITargetLowering::isFMAFasterThanFMulAndFAdd(const MachineFunction &MF,
                                                EVT VT) const {
VT = VT.getScalarType();

switch (VT.getSimpleVT().SimpleTy) {
case MVT::f32: {
  // If mad is not available this depends only on if f32 fma is full rate.
  if (!Subtarget->hasMadMacF32Insts())
    return Subtarget->hasFastFMAF32();

  // Otherwise f32 mad is always full rate and returns the same result as
  // the separate operations so should be preferred over fma.
  // However does not support denomals.
  if (hasFP32Denormals(MF))
    return Subtarget->hasFastFMAF32() || Subtarget->hasDLInsts();

  // If the subtarget has v_fmac_f32, that's just as good as v_mac_f32.
  return Subtarget->hasFastFMAF32() && Subtarget->hasDLInsts();
}
case MVT::f64:
  return true;
case MVT::f16:
  return Subtarget->has16BitInsts() && hasFP64FP16Denormals(MF);
default:
  break;
}

return false;
4451}

4453bool SITargetLowering::isFMADLegal(const SelectionDAG &DAG,
                                 const SDNode *N) const {
// TODO: Check future ftz flag
// v_mad_f32/v_mac_f32 do not support denormals.
EVT VT = N->getValueType(0);
if (VT == MVT::f32)
  return Subtarget->hasMadMacF32Insts() &&
         !hasFP32Denormals(DAG.getMachineFunction());
if (VT == MVT::f16) {
  return Subtarget->hasMadF16() &&
         !hasFP64FP16Denormals(DAG.getMachineFunction());
}

return false;
4467}

4469//===----------------------------------------------------------------------===//
4470// Custom DAG Lowering Operations
4471//===----------------------------------------------------------------------===//

4473// Work around LegalizeDAG doing the wrong thing and fully scalarizing if the
4474// wider vector type is legal.
4475SDValue SITargetLowering::splitUnaryVectorOp(SDValue Op,
                                           SelectionDAG &DAG) const {
unsigned Opc = Op.getOpcode();
EVT VT = Op.getValueType();
assert(VT == MVT::v4f16 || VT == MVT::v4i16)((void)0);

SDValue Lo, Hi;
std::tie(Lo, Hi) = DAG.SplitVectorOperand(Op.getNode(), 0);

SDLoc SL(Op);
SDValue OpLo = DAG.getNode(Opc, SL, Lo.getValueType(), Lo,
                           Op->getFlags());
SDValue OpHi = DAG.getNode(Opc, SL, Hi.getValueType(), Hi,
                           Op->getFlags());

return DAG.getNode(ISD::CONCAT_VECTORS, SDLoc(Op), VT, OpLo, OpHi);
4491}

4493// Work around LegalizeDAG doing the wrong thing and fully scalarizing if the
4494// wider vector type is legal.
4495SDValue SITargetLowering::splitBinaryVectorOp(SDValue Op,
                                            SelectionDAG &DAG) const {
unsigned Opc = Op.getOpcode();
EVT VT = Op.getValueType();
assert(VT == MVT::v4i16 || VT == MVT::v4f16 || VT == MVT::v4f32 ||((void)0)
       VT == MVT::v8f32 || VT == MVT::v16f32 || VT == MVT::v32f32)((void)0);

SDValue Lo0, Hi0;
std::tie(Lo0, Hi0) = DAG.SplitVectorOperand(Op.getNode(), 0);
SDValue Lo1, Hi1;
std::tie(Lo1, Hi1) = DAG.SplitVectorOperand(Op.getNode(), 1);

SDLoc SL(Op);

SDValue OpLo = DAG.getNode(Opc, SL, Lo0.getValueType(), Lo0, Lo1,
                           Op->getFlags());
SDValue OpHi = DAG.getNode(Opc, SL, Hi0.getValueType(), Hi0, Hi1,
                           Op->getFlags());

return DAG.getNode(ISD::CONCAT_VECTORS, SDLoc(Op), VT, OpLo, OpHi);
4515}

4517SDValue SITargetLowering::splitTernaryVectorOp(SDValue Op,
                                            SelectionDAG &DAG) const {
unsigned Opc = Op.getOpcode();
EVT VT = Op.getValueType();
assert(VT == MVT::v4i16 || VT == MVT::v4f16 || VT == MVT::v4f32 ||((void)0)
       VT == MVT::v8f32 || VT == MVT::v16f32 || VT == MVT::v32f32)((void)0);

SDValue Lo0, Hi0;
std::tie(Lo0, Hi0) = DAG.SplitVectorOperand(Op.getNode(), 0);
SDValue Lo1, Hi1;
std::tie(Lo1, Hi1) = DAG.SplitVectorOperand(Op.getNode(), 1);
SDValue Lo2, Hi2;
std::tie(Lo2, Hi2) = DAG.SplitVectorOperand(Op.getNode(), 2);

SDLoc SL(Op);

SDValue OpLo = DAG.getNode(Opc, SL, Lo0.getValueType(), Lo0, Lo1, Lo2,
                           Op->getFlags());
SDValue OpHi = DAG.getNode(Opc, SL, Hi0.getValueType(), Hi0, Hi1, Hi2,
                           Op->getFlags());

return DAG.getNode(ISD::CONCAT_VECTORS, SDLoc(Op), VT, OpLo, OpHi);
4539}


4542SDValue SITargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
switch (Op.getOpcode()) {
default: return AMDGPUTargetLowering::LowerOperation(Op, DAG);
case ISD::BRCOND: return LowerBRCOND(Op, DAG);
case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
case ISD::LOAD: {
  SDValue Result = LowerLOAD(Op, DAG);
  assert((!Result.getNode() ||((void)0)
          Result.getNode()->getNumValues() == 2) &&((void)0)
         "Load should return a value and a chain")((void)0);
  return Result;
}

case ISD::FSIN:
case ISD::FCOS:
  return LowerTrig(Op, DAG);
case ISD::SELECT: return LowerSELECT(Op, DAG);
case ISD::FDIV: return LowerFDIV(Op, DAG);
case ISD::ATOMIC_CMP_SWAP: return LowerATOMIC_CMP_SWAP(Op, DAG);
case ISD::STORE: return LowerSTORE(Op, DAG);
case ISD::GlobalAddress: {
  MachineFunction &MF = DAG.getMachineFunction();
  SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
  return LowerGlobalAddress(MFI, Op, DAG);
}
case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
case ISD::INTRINSIC_W_CHAIN: return LowerINTRINSIC_W_CHAIN(Op, DAG);
case ISD::INTRINSIC_VOID: return LowerINTRINSIC_VOID(Op, DAG);
case ISD::ADDRSPACECAST: return lowerADDRSPACECAST(Op, DAG);
case ISD::INSERT_SUBVECTOR:
  return lowerINSERT_SUBVECTOR(Op, DAG);
case ISD::INSERT_VECTOR_ELT:
  return lowerINSERT_VECTOR_ELT(Op, DAG);
case ISD::EXTRACT_VECTOR_ELT:
  return lowerEXTRACT_VECTOR_ELT(Op, DAG);
case ISD::VECTOR_SHUFFLE:
  return lowerVECTOR_SHUFFLE(Op, DAG);
case ISD::BUILD_VECTOR:
  return lowerBUILD_VECTOR(Op, DAG);
case ISD::FP_ROUND:
  return lowerFP_ROUND(Op, DAG);
case ISD::TRAP:
  return lowerTRAP(Op, DAG);
case ISD::DEBUGTRAP:
  return lowerDEBUGTRAP(Op, DAG);
case ISD::FABS:
case ISD::FNEG:
case ISD::FCANONICALIZE:
case ISD::BSWAP:
  return splitUnaryVectorOp(Op, DAG);
case ISD::FMINNUM:
case ISD::FMAXNUM:
  return lowerFMINNUM_FMAXNUM(Op, DAG);
case ISD::FMA:
  return splitTernaryVectorOp(Op, DAG);
case ISD::FP_TO_SINT:
case ISD::FP_TO_UINT:
  return LowerFP_TO_INT(Op, DAG);
case ISD::SHL:
case ISD::SRA:
case ISD::SRL:
case ISD::ADD:
case ISD::SUB:
case ISD::MUL:
case ISD::SMIN:
case ISD::SMAX:
case ISD::UMIN:
case ISD::UMAX:
case ISD::FADD:
case ISD::FMUL:
case ISD::FMINNUM_IEEE:
case ISD::FMAXNUM_IEEE:
case ISD::UADDSAT:
case ISD::USUBSAT:
case ISD::SADDSAT:
case ISD::SSUBSAT:
  return splitBinaryVectorOp(Op, DAG);
case ISD::SMULO:
case ISD::UMULO:
  return lowerXMULO(Op, DAG);
case ISD::DYNAMIC_STACKALLOC:
  return LowerDYNAMIC_STACKALLOC(Op, DAG);
}
return SDValue();
4626}

4628// Used for D16: Casts the result of an instruction into the right vector,
4629// packs values if loads return unpacked values.
4630static SDValue adjustLoadValueTypeImpl(SDValue Result, EVT LoadVT,
                                     const SDLoc &DL,
                                     SelectionDAG &DAG, bool Unpacked) {
if (!LoadVT.isVector())
  return Result;

// Cast back to the original packed type or to a larger type that is a
// multiple of 32 bit for D16. Widening the return type is a required for
// legalization.
EVT FittingLoadVT = LoadVT;
if ((LoadVT.getVectorNumElements() % 2) == 1) {
  FittingLoadVT =
      EVT::getVectorVT(*DAG.getContext(), LoadVT.getVectorElementType(),
                       LoadVT.getVectorNumElements() + 1);
}

if (Unpacked) { // From v2i32/v4i32 back to v2f16/v4f16.
  // Truncate to v2i16/v4i16.
  EVT IntLoadVT = FittingLoadVT.changeTypeToInteger();

  // Workaround legalizer not scalarizing truncate after vector op
  // legalization but not creating intermediate vector trunc.
  SmallVector<SDValue, 4> Elts;
  DAG.ExtractVectorElements(Result, Elts);
  for (SDValue &Elt : Elts)
    Elt = DAG.getNode(ISD::TRUNCATE, DL, MVT::i16, Elt);

  // Pad illegal v1i16/v3fi6 to v4i16
  if ((LoadVT.getVectorNumElements() % 2) == 1)
    Elts.push_back(DAG.getUNDEF(MVT::i16));

  Result = DAG.getBuildVector(IntLoadVT, DL, Elts);

  // Bitcast to original type (v2f16/v4f16).
  return DAG.getNode(ISD::BITCAST, DL, FittingLoadVT, Result);
}

// Cast back to the original packed type.
return DAG.getNode(ISD::BITCAST, DL, FittingLoadVT, Result);
4669}

4671SDValue SITargetLowering::adjustLoadValueType(unsigned Opcode,
                                            MemSDNode *M,
                                            SelectionDAG &DAG,
                                            ArrayRef<SDValue> Ops,
                                            bool IsIntrinsic) const {
SDLoc DL(M);

bool Unpacked = Subtarget->hasUnpackedD16VMem();
EVT LoadVT = M->getValueType(0);

EVT EquivLoadVT = LoadVT;
if (LoadVT.isVector()) {
  if (Unpacked) {
    EquivLoadVT = EVT::getVectorVT(*DAG.getContext(), MVT::i32,
                                   LoadVT.getVectorNumElements());
  } else if ((LoadVT.getVectorNumElements() % 2) == 1) {
    // Widen v3f16 to legal type
    EquivLoadVT =
        EVT::getVectorVT(*DAG.getContext(), LoadVT.getVectorElementType(),
                         LoadVT.getVectorNumElements() + 1);
  }
}

// Change from v4f16/v2f16 to EquivLoadVT.
SDVTList VTList = DAG.getVTList(EquivLoadVT, MVT::Other);

SDValue Load
  = DAG.getMemIntrinsicNode(
    IsIntrinsic ? (unsigned)ISD::INTRINSIC_W_CHAIN : Opcode, DL,
    VTList, Ops, M->getMemoryVT(),
    M->getMemOperand());

SDValue Adjusted = adjustLoadValueTypeImpl(Load, LoadVT, DL, DAG, Unpacked);

return DAG.getMergeValues({ Adjusted, Load.getValue(1) }, DL);
4706}

4708SDValue SITargetLowering::lowerIntrinsicLoad(MemSDNode *M, bool IsFormat,
                                           SelectionDAG &DAG,
                                           ArrayRef<SDValue> Ops) const {
SDLoc DL(M);
EVT LoadVT = M->getValueType(0);
EVT EltType = LoadVT.getScalarType();
EVT IntVT = LoadVT.changeTypeToInteger();

bool IsD16 = IsFormat && (EltType.getSizeInBits() == 16);

unsigned Opc =
    IsFormat ? AMDGPUISD::BUFFER_LOAD_FORMAT : AMDGPUISD::BUFFER_LOAD;

if (IsD16) {
  return adjustLoadValueType(AMDGPUISD::BUFFER_LOAD_FORMAT_D16, M, DAG, Ops);
}

// Handle BUFFER_LOAD_BYTE/UBYTE/SHORT/USHORT overloaded intrinsics
if (!IsD16 && !LoadVT.isVector() && EltType.getSizeInBits() < 32)
  return handleByteShortBufferLoads(DAG, LoadVT, DL, Ops, M);

if (isTypeLegal(LoadVT)) {
  return getMemIntrinsicNode(Opc, DL, M->getVTList(), Ops, IntVT,
                             M->getMemOperand(), DAG);
}

EVT CastVT = getEquivalentMemType(*DAG.getContext(), LoadVT);
SDVTList VTList = DAG.getVTList(CastVT, MVT::Other);
SDValue MemNode = getMemIntrinsicNode(Opc, DL, VTList, Ops, CastVT,
                                      M->getMemOperand(), DAG);
return DAG.getMergeValues(
    {DAG.getNode(ISD::BITCAST, DL, LoadVT, MemNode), MemNode.getValue(1)},
    DL);
4741}

4743static SDValue lowerICMPIntrinsic(const SITargetLowering &TLI,
                                SDNode *N, SelectionDAG &DAG) {
EVT VT = N->getValueType(0);
const auto *CD = cast<ConstantSDNode>(N->getOperand(3));
unsigned CondCode = CD->getZExtValue();
if (!ICmpInst::isIntPredicate(static_cast<ICmpInst::Predicate>(CondCode)))
  return DAG.getUNDEF(VT);

ICmpInst::Predicate IcInput = static_cast<ICmpInst::Predicate>(CondCode);

SDValue LHS = N->getOperand(1);
SDValue RHS = N->getOperand(2);

SDLoc DL(N);

EVT CmpVT = LHS.getValueType();
if (CmpVT == MVT::i16 && !TLI.isTypeLegal(MVT::i16)) {
  unsigned PromoteOp = ICmpInst::isSigned(IcInput) ?
    ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
  LHS = DAG.getNode(PromoteOp, DL, MVT::i32, LHS);
  RHS = DAG.getNode(PromoteOp, DL, MVT::i32, RHS);
}

ISD::CondCode CCOpcode = getICmpCondCode(IcInput);

unsigned WavefrontSize = TLI.getSubtarget()->getWavefrontSize();
EVT CCVT = EVT::getIntegerVT(*DAG.getContext(), WavefrontSize);

SDValue SetCC = DAG.getNode(AMDGPUISD::SETCC, DL, CCVT, LHS, RHS,
                            DAG.getCondCode(CCOpcode));
if (VT.bitsEq(CCVT))
  return SetCC;
return DAG.getZExtOrTrunc(SetCC, DL, VT);
4776}

4778static SDValue lowerFCMPIntrinsic(const SITargetLowering &TLI,
                                SDNode *N, SelectionDAG &DAG) {
EVT VT = N->getValueType(0);
const auto *CD = cast<ConstantSDNode>(N->getOperand(3));

unsigned CondCode = CD->getZExtValue();
if (!FCmpInst::isFPPredicate(static_cast<FCmpInst::Predicate>(CondCode)))
  return DAG.getUNDEF(VT);

SDValue Src0 = N->getOperand(1);
SDValue Src1 = N->getOperand(2);
EVT CmpVT = Src0.getValueType();
SDLoc SL(N);

if (CmpVT == MVT::f16 && !TLI.isTypeLegal(CmpVT)) {
  Src0 = DAG.getNode(ISD::FP_EXTEND, SL, MVT::f32, Src0);
  Src1 = DAG.getNode(ISD::FP_EXTEND, SL, MVT::f32, Src1);
}

FCmpInst::Predicate IcInput = static_cast<FCmpInst::Predicate>(CondCode);
ISD::CondCode CCOpcode = getFCmpCondCode(IcInput);
unsigned WavefrontSize = TLI.getSubtarget()->getWavefrontSize();
EVT CCVT = EVT::getIntegerVT(*DAG.getContext(), WavefrontSize);
SDValue SetCC = DAG.getNode(AMDGPUISD::SETCC, SL, CCVT, Src0,
                            Src1, DAG.getCondCode(CCOpcode));
if (VT.bitsEq(CCVT))
  return SetCC;
return DAG.getZExtOrTrunc(SetCC, SL, VT);
4806}

4808static SDValue lowerBALLOTIntrinsic(const SITargetLowering &TLI, SDNode *N,
                                  SelectionDAG &DAG) {
EVT VT = N->getValueType(0);
SDValue Src = N->getOperand(1);
SDLoc SL(N);

if (Src.getOpcode() == ISD::SETCC) {
  // (ballot (ISD::SETCC ...)) -> (AMDGPUISD::SETCC ...)
  return DAG.getNode(AMDGPUISD::SETCC, SL, VT, Src.getOperand(0),
                     Src.getOperand(1), Src.getOperand(2));
}
if (const ConstantSDNode *Arg = dyn_cast<ConstantSDNode>(Src)) {
  // (ballot 0) -> 0
  if (Arg->isNullValue())
    return DAG.getConstant(0, SL, VT);

  // (ballot 1) -> EXEC/EXEC_LO
  if (Arg->isOne()) {
    Register Exec;
    if (VT.getScalarSizeInBits() == 32)
      Exec = AMDGPU::EXEC_LO;
    else if (VT.getScalarSizeInBits() == 64)
      Exec = AMDGPU::EXEC;
    else
      return SDValue();

    return DAG.getCopyFromReg(DAG.getEntryNode(), SL, Exec, VT);
  }
}

// (ballot (i1 $src)) -> (AMDGPUISD::SETCC (i32 (zext $src)) (i32 0)
// ISD::SETNE)
return DAG.getNode(
    AMDGPUISD::SETCC, SL, VT, DAG.getZExtOrTrunc(Src, SL, MVT::i32),
    DAG.getConstant(0, SL, MVT::i32), DAG.getCondCode(ISD::SETNE));
4843}

4845void SITargetLowering::ReplaceNodeResults(SDNode *N,
                                        SmallVectorImpl<SDValue> &Results,
                                        SelectionDAG &DAG) const {
switch (N->getOpcode()) {
case ISD::INSERT_VECTOR_ELT: {
  if (SDValue Res = lowerINSERT_VECTOR_ELT(SDValue(N, 0), DAG))
    Results.push_back(Res);
  return;
}
case ISD::EXTRACT_VECTOR_ELT: {
  if (SDValue Res = lowerEXTRACT_VECTOR_ELT(SDValue(N, 0), DAG))
    Results.push_back(Res);
  return;
}
case ISD::INTRINSIC_WO_CHAIN: {
  unsigned IID = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
  switch (IID) {
  case Intrinsic::amdgcn_cvt_pkrtz: {
    SDValue Src0 = N->getOperand(1);
    SDValue Src1 = N->getOperand(2);
    SDLoc SL(N);
    SDValue Cvt = DAG.getNode(AMDGPUISD::CVT_PKRTZ_F16_F32, SL, MVT::i32,
                              Src0, Src1);
    Results.push_back(DAG.getNode(ISD::BITCAST, SL, MVT::v2f16, Cvt));
    return;
  }
  case Intrinsic::amdgcn_cvt_pknorm_i16:
  case Intrinsic::amdgcn_cvt_pknorm_u16:
  case Intrinsic::amdgcn_cvt_pk_i16:
  case Intrinsic::amdgcn_cvt_pk_u16: {
    SDValue Src0 = N->getOperand(1);
    SDValue Src1 = N->getOperand(2);
    SDLoc SL(N);
    unsigned Opcode;

    if (IID == Intrinsic::amdgcn_cvt_pknorm_i16)
      Opcode = AMDGPUISD::CVT_PKNORM_I16_F32;
    else if (IID == Intrinsic::amdgcn_cvt_pknorm_u16)
      Opcode = AMDGPUISD::CVT_PKNORM_U16_F32;
    else if (IID == Intrinsic::amdgcn_cvt_pk_i16)
      Opcode = AMDGPUISD::CVT_PK_I16_I32;
    else
      Opcode = AMDGPUISD::CVT_PK_U16_U32;

    EVT VT = N->getValueType(0);
    if (isTypeLegal(VT))
      Results.push_back(DAG.getNode(Opcode, SL, VT, Src0, Src1));
    else {
      SDValue Cvt = DAG.getNode(Opcode, SL, MVT::i32, Src0, Src1);
      Results.push_back(DAG.getNode(ISD::BITCAST, SL, MVT::v2i16, Cvt));
    }
    return;
  }
  }
  break;
}
case ISD::INTRINSIC_W_CHAIN: {
  if (SDValue Res = LowerINTRINSIC_W_CHAIN(SDValue(N, 0), DAG)) {
    if (Res.getOpcode() == ISD::MERGE_VALUES) {
      // FIXME: Hacky
      for (unsigned I = 0; I < Res.getNumOperands(); I++) {
        Results.push_back(Res.getOperand(I));
      }
    } else {
      Results.push_back(Res);
      Results.push_back(Res.getValue(1));
    }
    return;
  }

  break;
}
case ISD::SELECT: {
  SDLoc SL(N);
  EVT VT = N->getValueType(0);
  EVT NewVT = getEquivalentMemType(*DAG.getContext(), VT);
  SDValue LHS = DAG.getNode(ISD::BITCAST, SL, NewVT, N->getOperand(1));
  SDValue RHS = DAG.getNode(ISD::BITCAST, SL, NewVT, N->getOperand(2));

  EVT SelectVT = NewVT;
  if (NewVT.bitsLT(MVT::i32)) {
    LHS = DAG.getNode(ISD::ANY_EXTEND, SL, MVT::i32, LHS);
    RHS = DAG.getNode(ISD::ANY_EXTEND, SL, MVT::i32, RHS);
    SelectVT = MVT::i32;
  }

  SDValue NewSelect = DAG.getNode(ISD::SELECT, SL, SelectVT,
                                  N->getOperand(0), LHS, RHS);

  if (NewVT != SelectVT)
    NewSelect = DAG.getNode(ISD::TRUNCATE, SL, NewVT, NewSelect);
  Results.push_back(DAG.getNode(ISD::BITCAST, SL, VT, NewSelect));
  return;
}
case ISD::FNEG: {
  if (N->getValueType(0) != MVT::v2f16)
    break;

  SDLoc SL(N);
  SDValue BC = DAG.getNode(ISD::BITCAST, SL, MVT::i32, N->getOperand(0));

  SDValue Op = DAG.getNode(ISD::XOR, SL, MVT::i32,
                           BC,
                           DAG.getConstant(0x80008000, SL, MVT::i32));
  Results.push_back(DAG.getNode(ISD::BITCAST, SL, MVT::v2f16, Op));
  return;
}
case ISD::FABS: {
  if (N->getValueType(0) != MVT::v2f16)
    break;

  SDLoc SL(N);
  SDValue BC = DAG.getNode(ISD::BITCAST, SL, MVT::i32, N->getOperand(0));

  SDValue Op = DAG.getNode(ISD::AND, SL, MVT::i32,
                           BC,
                           DAG.getConstant(0x7fff7fff, SL, MVT::i32));
  Results.push_back(DAG.getNode(ISD::BITCAST, SL, MVT::v2f16, Op));
  return;
}
default:
  break;
}
4968}

4970/// Helper function for LowerBRCOND
4971static SDNode *findUser(SDValue Value, unsigned Opcode) {

SDNode *Parent = Value.getNode();
for (SDNode::use_iterator I = Parent->use_begin(), E = Parent->use_end();
     I != E; ++I) {

  if (I.getUse().get() != Value)
    continue;

  if (I->getOpcode() == Opcode)
    return *I;
}
return nullptr;
4984}

4986unsigned SITargetLowering::isCFIntrinsic(const SDNode *Intr) const {
if (Intr->getOpcode() == ISD::INTRINSIC_W_CHAIN) {
  switch (cast<ConstantSDNode>(Intr->getOperand(1))->getZExtValue()) {
  case Intrinsic::amdgcn_if:
    return AMDGPUISD::IF;
  case Intrinsic::amdgcn_else:
    return AMDGPUISD::ELSE;
  case Intrinsic::amdgcn_loop:
    return AMDGPUISD::LOOP;
  case Intrinsic::amdgcn_end_cf:
    llvm_unreachable("should not occur")__builtin_unreachable();
  default:
    return 0;
  }
}

// break, if_break, else_break are all only used as inputs to loop, not
// directly as branch conditions.
return 0;
5005}

5007bool SITargetLowering::shouldEmitFixup(const GlobalValue *GV) const {
const Triple &TT = getTargetMachine().getTargetTriple();
return (GV->getAddressSpace() == AMDGPUAS::CONSTANT_ADDRESS ||
        GV->getAddressSpace() == AMDGPUAS::CONSTANT_ADDRESS_32BIT) &&
       AMDGPU::shouldEmitConstantsToTextSection(TT);
5012}

5014bool SITargetLowering::shouldEmitGOTReloc(const GlobalValue *GV) const {
// FIXME: Either avoid relying on address space here or change the default
// address space for functions to avoid the explicit check.
return (GV->getValueType()->isFunctionTy() ||
        !isNonGlobalAddrSpace(GV->getAddressSpace())) &&
       !shouldEmitFixup(GV) &&
       !getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
5021}

5023bool SITargetLowering::shouldEmitPCReloc(const GlobalValue *GV) const {
return !shouldEmitFixup(GV) && !shouldEmitGOTReloc(GV);
5025}

5027bool SITargetLowering::shouldUseLDSConstAddress(const GlobalValue *GV) const {
if (!GV->hasExternalLinkage())
  return true;

const auto OS = getTargetMachine().getTargetTriple().getOS();
return OS == Triple::AMDHSA || OS == Triple::AMDPAL;
5033}

5035/// This transforms the control flow intrinsics to get the branch destination as
5036/// last parameter, also switches branch target with BR if the need arise
5037SDValue SITargetLowering::LowerBRCOND(SDValue BRCOND,
                                    SelectionDAG &DAG) const {
SDLoc DL(BRCOND);

SDNode *Intr = BRCOND.getOperand(1).getNode();
SDValue Target = BRCOND.getOperand(2);
SDNode *BR = nullptr;
SDNode *SetCC = nullptr;

if (Intr->getOpcode() == ISD::SETCC) {
  // As long as we negate the condition everything is fine
  SetCC = Intr;
  Intr = SetCC->getOperand(0).getNode();

} else {
  // Get the target from BR if we don't negate the condition
  BR = findUser(BRCOND, ISD::BR);
  assert(BR && "brcond missing unconditional branch user")((void)0);
  Target = BR->getOperand(1);
}

unsigned CFNode = isCFIntrinsic(Intr);
if (CFNode == 0) {
  // This is a uniform branch so we don't need to legalize.
  return BRCOND;
}

bool HaveChain = Intr->getOpcode() == ISD::INTRINSIC_VOID ||
                 Intr->getOpcode() == ISD::INTRINSIC_W_CHAIN;

assert(!SetCC ||((void)0)
      (SetCC->getConstantOperandVal(1) == 1 &&((void)0)
       cast<CondCodeSDNode>(SetCC->getOperand(2).getNode())->get() ==((void)0)
                                                           ISD::SETNE))((void)0);

// operands of the new intrinsic call
SmallVector<SDValue, 4> Ops;
if (HaveChain)
  Ops.push_back(BRCOND.getOperand(0));

Ops.append(Intr->op_begin() + (HaveChain ?  2 : 1), Intr->op_end());
Ops.push_back(Target);

ArrayRef<EVT> Res(Intr->value_begin() + 1, Intr->value_end());

// build the new intrinsic call
SDNode *Result = DAG.getNode(CFNode, DL, DAG.getVTList(Res), Ops).getNode();

if (!HaveChain) {
  SDValue Ops[] =  {
    SDValue(Result, 0),
    BRCOND.getOperand(0)
  };

  Result = DAG.getMergeValues(Ops, DL).getNode();
}

if (BR) {
  // Give the branch instruction our target
  SDValue Ops[] = {
    BR->getOperand(0),
    BRCOND.getOperand(2)
  };
  SDValue NewBR = DAG.getNode(ISD::BR, DL, BR->getVTList(), Ops);
  DAG.ReplaceAllUsesWith(BR, NewBR.getNode());
}

SDValue Chain = SDValue(Result, Result->getNumValues() - 1);

// Copy the intrinsic results to registers
for (unsigned i = 1, e = Intr->getNumValues() - 1; i != e; ++i) {
  SDNode *CopyToReg = findUser(SDValue(Intr, i), ISD::CopyToReg);
  if (!CopyToReg)
    continue;

  Chain = DAG.getCopyToReg(
    Chain, DL,
    CopyToReg->getOperand(1),
    SDValue(Result, i - 1),
    SDValue());

  DAG.ReplaceAllUsesWith(SDValue(CopyToReg, 0), CopyToReg->getOperand(0));
}

// Remove the old intrinsic from the chain
DAG.ReplaceAllUsesOfValueWith(
  SDValue(Intr, Intr->getNumValues() - 1),
  Intr->getOperand(0));

return Chain;
5127}

5129SDValue SITargetLowering::LowerRETURNADDR(SDValue Op,
                                        SelectionDAG &DAG) const {
MVT VT = Op.getSimpleValueType();
SDLoc DL(Op);
// Checking the depth
if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() != 0)
  return DAG.getConstant(0, DL, VT);

MachineFunction &MF = DAG.getMachineFunction();
const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
// Check for kernel and shader functions
if (Info->isEntryFunction())
  return DAG.getConstant(0, DL, VT);

MachineFrameInfo &MFI = MF.getFrameInfo();
// There is a call to @llvm.returnaddress in this function
MFI.setReturnAddressIsTaken(true);

const SIRegisterInfo *TRI = getSubtarget()->getRegisterInfo();
// Get the return address reg and mark it as an implicit live-in
Register Reg = MF.addLiveIn(TRI->getReturnAddressReg(MF), getRegClassFor(VT, Op.getNode()->isDivergent()));

return DAG.getCopyFromReg(DAG.getEntryNode(), DL, Reg, VT);
5152}

5154SDValue SITargetLowering::getFPExtOrFPRound(SelectionDAG &DAG,
                                          SDValue Op,
                                          const SDLoc &DL,
                                          EVT VT) const {
return Op.getValueType().bitsLE(VT) ?
    DAG.getNode(ISD::FP_EXTEND, DL, VT, Op) :
  DAG.getNode(ISD::FP_ROUND, DL, VT, Op,
              DAG.getTargetConstant(0, DL, MVT::i32));
5162}

5164SDValue SITargetLowering::lowerFP_ROUND(SDValue Op, SelectionDAG &DAG) const {
assert(Op.getValueType() == MVT::f16 &&((void)0)
       "Do not know how to custom lower FP_ROUND for non-f16 type")((void)0);

SDValue Src = Op.getOperand(0);
EVT SrcVT = Src.getValueType();
if (SrcVT != MVT::f64)
  return Op;

SDLoc DL(Op);

SDValue FpToFp16 = DAG.getNode(ISD::FP_TO_FP16, DL, MVT::i32, Src);
SDValue Trunc = DAG.getNode(ISD::TRUNCATE, DL, MVT::i16, FpToFp16);
return DAG.getNode(ISD::BITCAST, DL, MVT::f16, Trunc);
5178}

5180SDValue SITargetLowering::lowerFMINNUM_FMAXNUM(SDValue Op,
                                             SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
const MachineFunction &MF = DAG.getMachineFunction();
const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
bool IsIEEEMode = Info->getMode().IEEE;

// FIXME: Assert during selection that this is only selected for
// ieee_mode. Currently a combine can produce the ieee version for non-ieee
// mode functions, but this happens to be OK since it's only done in cases
// where there is known no sNaN.
if (IsIEEEMode)
  return expandFMINNUM_FMAXNUM(Op.getNode(), DAG);

if (VT == MVT::v4f16)
  return splitBinaryVectorOp(Op, DAG);
return Op;
5197}

5199SDValue SITargetLowering::lowerXMULO(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
SDLoc SL(Op);
SDValue LHS = Op.getOperand(0);
SDValue RHS = Op.getOperand(1);
bool isSigned = Op.getOpcode() == ISD::SMULO;

if (ConstantSDNode *RHSC = isConstOrConstSplat(RHS)) {
  const APInt &C = RHSC->getAPIntValue();
  // mulo(X, 1 << S) -> { X << S, (X << S) >> S != X }
  if (C.isPowerOf2()) {
    // smulo(x, signed_min) is same as umulo(x, signed_min).
    bool UseArithShift = isSigned && !C.isMinSignedValue();
    SDValue ShiftAmt = DAG.getConstant(C.logBase2(), SL, MVT::i32);
    SDValue Result = DAG.getNode(ISD::SHL, SL, VT, LHS, ShiftAmt);
    SDValue Overflow = DAG.getSetCC(SL, MVT::i1,
        DAG.getNode(UseArithShift ? ISD::SRA : ISD::SRL,
                    SL, VT, Result, ShiftAmt),
        LHS, ISD::SETNE);
    return DAG.getMergeValues({ Result, Overflow }, SL);
  }
}

SDValue Result = DAG.getNode(ISD::MUL, SL, VT, LHS, RHS);
SDValue Top = DAG.getNode(isSigned ? ISD::MULHS : ISD::MULHU,
                          SL, VT, LHS, RHS);

SDValue Sign = isSigned
  ? DAG.getNode(ISD::SRA, SL, VT, Result,
                DAG.getConstant(VT.getScalarSizeInBits() - 1, SL, MVT::i32))
  : DAG.getConstant(0, SL, VT);
SDValue Overflow = DAG.getSetCC(SL, MVT::i1, Top, Sign, ISD::SETNE);

return DAG.getMergeValues({ Result, Overflow }, SL);
5233}

5235SDValue SITargetLowering::lowerTRAP(SDValue Op, SelectionDAG &DAG) const {
if (!Subtarget->isTrapHandlerEnabled() ||
    Subtarget->getTrapHandlerAbi() != GCNSubtarget::TrapHandlerAbi::AMDHSA)
  return lowerTrapEndpgm(Op, DAG);

if (Optional<uint8_t> HsaAbiVer = AMDGPU::getHsaAbiVersion(Subtarget)) {
  switch (*HsaAbiVer) {
  case ELF::ELFABIVERSION_AMDGPU_HSA_V2:
  case ELF::ELFABIVERSION_AMDGPU_HSA_V3:
    return lowerTrapHsaQueuePtr(Op, DAG);
  case ELF::ELFABIVERSION_AMDGPU_HSA_V4:
    return Subtarget->supportsGetDoorbellID() ?
        lowerTrapHsa(Op, DAG) : lowerTrapHsaQueuePtr(Op, DAG);
  }
}

llvm_unreachable("Unknown trap handler")__builtin_unreachable();
5252}

5254SDValue SITargetLowering::lowerTrapEndpgm(
  SDValue Op, SelectionDAG &DAG) const {
SDLoc SL(Op);
SDValue Chain = Op.getOperand(0);
return DAG.getNode(AMDGPUISD::ENDPGM, SL, MVT::Other, Chain);
5259}

5261SDValue SITargetLowering::lowerTrapHsaQueuePtr(
  SDValue Op, SelectionDAG &DAG) const {
SDLoc SL(Op);
SDValue Chain = Op.getOperand(0);

MachineFunction &MF = DAG.getMachineFunction();
SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
Register UserSGPR = Info->getQueuePtrUserSGPR();
assert(UserSGPR != AMDGPU::NoRegister)((void)0);
SDValue QueuePtr = CreateLiveInRegister(
  DAG, &AMDGPU::SReg_64RegClass, UserSGPR, MVT::i64);
SDValue SGPR01 = DAG.getRegister(AMDGPU::SGPR0_SGPR1, MVT::i64);
SDValue ToReg = DAG.getCopyToReg(Chain, SL, SGPR01,
                                 QueuePtr, SDValue());

uint64_t TrapID = static_cast<uint64_t>(GCNSubtarget::TrapID::LLVMAMDHSATrap);
SDValue Ops[] = {
  ToReg,
  DAG.getTargetConstant(TrapID, SL, MVT::i16),
  SGPR01,
  ToReg.getValue(1)
};
return DAG.getNode(AMDGPUISD::TRAP, SL, MVT::Other, Ops);
5284}

5286SDValue SITargetLowering::lowerTrapHsa(
  SDValue Op, SelectionDAG &DAG) const {
SDLoc SL(Op);
SDValue Chain = Op.getOperand(0);

uint64_t TrapID = static_cast<uint64_t>(GCNSubtarget::TrapID::LLVMAMDHSATrap);
SDValue Ops[] = {
  Chain,
  DAG.getTargetConstant(TrapID, SL, MVT::i16)
};
return DAG.getNode(AMDGPUISD::TRAP, SL, MVT::Other, Ops);
5297}

5299SDValue SITargetLowering::lowerDEBUGTRAP(SDValue Op, SelectionDAG &DAG) const {
SDLoc SL(Op);
SDValue Chain = Op.getOperand(0);
MachineFunction &MF = DAG.getMachineFunction();

if (!Subtarget->isTrapHandlerEnabled() ||
    Subtarget->getTrapHandlerAbi() != GCNSubtarget::TrapHandlerAbi::AMDHSA) {
  DiagnosticInfoUnsupported NoTrap(MF.getFunction(),
                                   "debugtrap handler not supported",
                                   Op.getDebugLoc(),
                                   DS_Warning);
  LLVMContext &Ctx = MF.getFunction().getContext();
  Ctx.diagnose(NoTrap);
  return Chain;
}

uint64_t TrapID = static_cast<uint64_t>(GCNSubtarget::TrapID::LLVMAMDHSADebugTrap);
SDValue Ops[] = {
  Chain,
  DAG.getTargetConstant(TrapID, SL, MVT::i16)
};
return DAG.getNode(AMDGPUISD::TRAP, SL, MVT::Other, Ops);
5321}

5323SDValue SITargetLowering::getSegmentAperture(unsigned AS, const SDLoc &DL,
                                           SelectionDAG &DAG) const {
// FIXME: Use inline constants (src_{shared, private}_base) instead.
if (Subtarget->hasApertureRegs()) {
  unsigned Offset = AS == AMDGPUAS::LOCAL_ADDRESS ?
      AMDGPU::Hwreg::OFFSET_SRC_SHARED_BASE :
      AMDGPU::Hwreg::OFFSET_SRC_PRIVATE_BASE;
  unsigned WidthM1 = AS == AMDGPUAS::LOCAL_ADDRESS ?
      AMDGPU::Hwreg::WIDTH_M1_SRC_SHARED_BASE :
      AMDGPU::Hwreg::WIDTH_M1_SRC_PRIVATE_BASE;
  unsigned Encoding =
      AMDGPU::Hwreg::ID_MEM_BASES << AMDGPU::Hwreg::ID_SHIFT_ |
      Offset << AMDGPU::Hwreg::OFFSET_SHIFT_ |
      WidthM1 << AMDGPU::Hwreg::WIDTH_M1_SHIFT_;

  SDValue EncodingImm = DAG.getTargetConstant(Encoding, DL, MVT::i16);
  SDValue ApertureReg = SDValue(
      DAG.getMachineNode(AMDGPU::S_GETREG_B32, DL, MVT::i32, EncodingImm), 0);
  SDValue ShiftAmount = DAG.getTargetConstant(WidthM1 + 1, DL, MVT::i32);
  return DAG.getNode(ISD::SHL, DL, MVT::i32, ApertureReg, ShiftAmount);
}

MachineFunction &MF = DAG.getMachineFunction();
SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
Register UserSGPR = Info->getQueuePtrUserSGPR();
assert(UserSGPR != AMDGPU::NoRegister)((void)0);

SDValue QueuePtr = CreateLiveInRegister(
  DAG, &AMDGPU::SReg_64RegClass, UserSGPR, MVT::i64);

// Offset into amd_queue_t for group_segment_aperture_base_hi /
// private_segment_aperture_base_hi.
uint32_t StructOffset = (AS == AMDGPUAS::LOCAL_ADDRESS) ? 0x40 : 0x44;

SDValue Ptr =
    DAG.getObjectPtrOffset(DL, QueuePtr, TypeSize::Fixed(StructOffset));

// TODO: Use custom target PseudoSourceValue.
// TODO: We should use the value from the IR intrinsic call, but it might not
// be available and how do we get it?
MachinePointerInfo PtrInfo(AMDGPUAS::CONSTANT_ADDRESS);
return DAG.getLoad(MVT::i32, DL, QueuePtr.getValue(1), Ptr, PtrInfo,
                   commonAlignment(Align(64), StructOffset),
                   MachineMemOperand::MODereferenceable |
                       MachineMemOperand::MOInvariant);
5368}

5370SDValue SITargetLowering::lowerADDRSPACECAST(SDValue Op,
                                           SelectionDAG &DAG) const {
SDLoc SL(Op);
const AddrSpaceCastSDNode *ASC = cast<AddrSpaceCastSDNode>(Op);

SDValue Src = ASC->getOperand(0);
SDValue FlatNullPtr = DAG.getConstant(0, SL, MVT::i64);

const AMDGPUTargetMachine &TM =
  static_cast<const AMDGPUTargetMachine &>(getTargetMachine());

// flat -> local/private
if (ASC->getSrcAddressSpace() == AMDGPUAS::FLAT_ADDRESS) {
  unsigned DestAS = ASC->getDestAddressSpace();

  if (DestAS == AMDGPUAS::LOCAL_ADDRESS ||
      DestAS == AMDGPUAS::PRIVATE_ADDRESS) {
    unsigned NullVal = TM.getNullPointerValue(DestAS);
    SDValue SegmentNullPtr = DAG.getConstant(NullVal, SL, MVT::i32);
    SDValue NonNull = DAG.getSetCC(SL, MVT::i1, Src, FlatNullPtr, ISD::SETNE);
    SDValue Ptr = DAG.getNode(ISD::TRUNCATE, SL, MVT::i32, Src);

    return DAG.getNode(ISD::SELECT, SL, MVT::i32,
                       NonNull, Ptr, SegmentNullPtr);
  }
}

// local/private -> flat
if (ASC->getDestAddressSpace() == AMDGPUAS::FLAT_ADDRESS) {
  unsigned SrcAS = ASC->getSrcAddressSpace();

  if (SrcAS == AMDGPUAS::LOCAL_ADDRESS ||
      SrcAS == AMDGPUAS::PRIVATE_ADDRESS) {
    unsigned NullVal = TM.getNullPointerValue(SrcAS);
    SDValue SegmentNullPtr = DAG.getConstant(NullVal, SL, MVT::i32);

    SDValue NonNull
      = DAG.getSetCC(SL, MVT::i1, Src, SegmentNullPtr, ISD::SETNE);

    SDValue Aperture = getSegmentAperture(ASC->getSrcAddressSpace(), SL, DAG);
    SDValue CvtPtr
      = DAG.getNode(ISD::BUILD_VECTOR, SL, MVT::v2i32, Src, Aperture);

    return DAG.getNode(ISD::SELECT, SL, MVT::i64, NonNull,
                       DAG.getNode(ISD::BITCAST, SL, MVT::i64, CvtPtr),
                       FlatNullPtr);
  }
}

if (ASC->getDestAddressSpace() == AMDGPUAS::CONSTANT_ADDRESS_32BIT &&
    Src.getValueType() == MVT::i64)
  return DAG.getNode(ISD::TRUNCATE, SL, MVT::i32, Src);

// global <-> flat are no-ops and never emitted.

const MachineFunction &MF = DAG.getMachineFunction();
DiagnosticInfoUnsupported InvalidAddrSpaceCast(
  MF.getFunction(), "invalid addrspacecast", SL.getDebugLoc());
DAG.getContext()->diagnose(InvalidAddrSpaceCast);

return DAG.getUNDEF(ASC->getValueType(0));
5431}

5433// This lowers an INSERT_SUBVECTOR by extracting the individual elements from
5434// the small vector and inserting them into the big vector. That is better than
5435// the default expansion of doing it via a stack slot. Even though the use of
5436// the stack slot would be optimized away afterwards, the stack slot itself
5437// remains.
5438SDValue SITargetLowering::lowerINSERT_SUBVECTOR(SDValue Op,
                                              SelectionDAG &DAG) const {
SDValue Vec = Op.getOperand(0);
SDValue Ins = Op.getOperand(1);
SDValue Idx = Op.getOperand(2);
EVT VecVT = Vec.getValueType();
EVT InsVT = Ins.getValueType();
EVT EltVT = VecVT.getVectorElementType();
unsigned InsNumElts = InsVT.getVectorNumElements();
unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
SDLoc SL(Op);

for (unsigned I = 0; I != InsNumElts; ++I) {
  SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, EltVT, Ins,
                            DAG.getConstant(I, SL, MVT::i32));
  Vec = DAG.getNode(ISD::INSERT_VECTOR_ELT, SL, VecVT, Vec, Elt,
                    DAG.getConstant(IdxVal + I, SL, MVT::i32));
}
return Vec;
5457}

5459SDValue SITargetLowering::lowerINSERT_VECTOR_ELT(SDValue Op,
                                               SelectionDAG &DAG) const {
SDValue Vec = Op.getOperand(0);
SDValue InsVal = Op.getOperand(1);
SDValue Idx = Op.getOperand(2);
EVT VecVT = Vec.getValueType();
EVT EltVT = VecVT.getVectorElementType();
unsigned VecSize = VecVT.getSizeInBits();
unsigned EltSize = EltVT.getSizeInBits();


assert(VecSize <= 64)((void)0);

unsigned NumElts = VecVT.getVectorNumElements();
SDLoc SL(Op);
auto KIdx = dyn_cast<ConstantSDNode>(Idx);

if (NumElts == 4 && EltSize == 16 && KIdx) {
  SDValue BCVec = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, Vec);

  SDValue LoHalf = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, BCVec,
                               DAG.getConstant(0, SL, MVT::i32));
  SDValue HiHalf = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, BCVec,
                               DAG.getConstant(1, SL, MVT::i32));

  SDValue LoVec = DAG.getNode(ISD::BITCAST, SL, MVT::v2i16, LoHalf);
  SDValue HiVec = DAG.getNode(ISD::BITCAST, SL, MVT::v2i16, HiHalf);

  unsigned Idx = KIdx->getZExtValue();
  bool InsertLo = Idx < 2;
  SDValue InsHalf = DAG.getNode(ISD::INSERT_VECTOR_ELT, SL, MVT::v2i16,
    InsertLo ? LoVec : HiVec,
    DAG.getNode(ISD::BITCAST, SL, MVT::i16, InsVal),
    DAG.getConstant(InsertLo ? Idx : (Idx - 2), SL, MVT::i32));

  InsHalf = DAG.getNode(ISD::BITCAST, SL, MVT::i32, InsHalf);

  SDValue Concat = InsertLo ?
    DAG.getBuildVector(MVT::v2i32, SL, { InsHalf, HiHalf }) :
    DAG.getBuildVector(MVT::v2i32, SL, { LoHalf, InsHalf });

  return DAG.getNode(ISD::BITCAST, SL, VecVT, Concat);
}

if (isa<ConstantSDNode>(Idx))
  return SDValue();

MVT IntVT = MVT::getIntegerVT(VecSize);

// Avoid stack access for dynamic indexing.
// v_bfi_b32 (v_bfm_b32 16, (shl idx, 16)), val, vec

// Create a congruent vector with the target value in each element so that
// the required element can be masked and ORed into the target vector.
SDValue ExtVal = DAG.getNode(ISD::BITCAST, SL, IntVT,
                             DAG.getSplatBuildVector(VecVT, SL, InsVal));

assert(isPowerOf2_32(EltSize))((void)0);
SDValue ScaleFactor = DAG.getConstant(Log2_32(EltSize), SL, MVT::i32);

// Convert vector index to bit-index.
SDValue ScaledIdx = DAG.getNode(ISD::SHL, SL, MVT::i32, Idx, ScaleFactor);

SDValue BCVec = DAG.getNode(ISD::BITCAST, SL, IntVT, Vec);
SDValue BFM = DAG.getNode(ISD::SHL, SL, IntVT,
                          DAG.getConstant(0xffff, SL, IntVT),
                          ScaledIdx);

SDValue LHS = DAG.getNode(ISD::AND, SL, IntVT, BFM, ExtVal);
SDValue RHS = DAG.getNode(ISD::AND, SL, IntVT,
                          DAG.getNOT(SL, BFM, IntVT), BCVec);

SDValue BFI = DAG.getNode(ISD::OR, SL, IntVT, LHS, RHS);
return DAG.getNode(ISD::BITCAST, SL, VecVT, BFI);
5533}

5535SDValue SITargetLowering::lowerEXTRACT_VECTOR_ELT(SDValue Op,
                                                SelectionDAG &DAG) const {
SDLoc SL(Op);

EVT ResultVT = Op.getValueType();
SDValue Vec = Op.getOperand(0);
SDValue Idx = Op.getOperand(1);
EVT VecVT = Vec.getValueType();
unsigned VecSize = VecVT.getSizeInBits();
EVT EltVT = VecVT.getVectorElementType();
assert(VecSize <= 64)((void)0);

DAGCombinerInfo DCI(DAG, AfterLegalizeVectorOps, true, nullptr);

// Make sure we do any optimizations that will make it easier to fold
// source modifiers before obscuring it with bit operations.

// XXX - Why doesn't this get called when vector_shuffle is expanded?
if (SDValue Combined = performExtractVectorEltCombine(Op.getNode(), DCI))
  return Combined;

unsigned EltSize = EltVT.getSizeInBits();
assert(isPowerOf2_32(EltSize))((void)0);

MVT IntVT = MVT::getIntegerVT(VecSize);
SDValue ScaleFactor = DAG.getConstant(Log2_32(EltSize), SL, MVT::i32);

// Convert vector index to bit-index (* EltSize)
SDValue ScaledIdx = DAG.getNode(ISD::SHL, SL, MVT::i32, Idx, ScaleFactor);

SDValue BC = DAG.getNode(ISD::BITCAST, SL, IntVT, Vec);
SDValue Elt = DAG.getNode(ISD::SRL, SL, IntVT, BC, ScaledIdx);

if (ResultVT == MVT::f16) {
  SDValue Result = DAG.getNode(ISD::TRUNCATE, SL, MVT::i16, Elt);
  return DAG.getNode(ISD::BITCAST, SL, ResultVT, Result);
}

return DAG.getAnyExtOrTrunc(Elt, SL, ResultVT);
5574}

5576static bool elementPairIsContiguous(ArrayRef<int> Mask, int Elt) {
assert(Elt % 2 == 0)((void)0);
return Mask[Elt + 1] == Mask[Elt] + 1 && (Mask[Elt] % 2 == 0);
5579}

5581SDValue SITargetLowering::lowerVECTOR_SHUFFLE(SDValue Op,
                                            SelectionDAG &DAG) const {
SDLoc SL(Op);
EVT ResultVT = Op.getValueType();
ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(Op);

EVT PackVT = ResultVT.isInteger() ? MVT::v2i16 : MVT::v2f16;
EVT EltVT = PackVT.getVectorElementType();
int SrcNumElts = Op.getOperand(0).getValueType().getVectorNumElements();

// vector_shuffle <0,1,6,7> lhs, rhs
// -> concat_vectors (extract_subvector lhs, 0), (extract_subvector rhs, 2)
//
// vector_shuffle <6,7,2,3> lhs, rhs
// -> concat_vectors (extract_subvector rhs, 2), (extract_subvector lhs, 2)
//
// vector_shuffle <6,7,0,1> lhs, rhs
// -> concat_vectors (extract_subvector rhs, 2), (extract_subvector lhs, 0)

// Avoid scalarizing when both halves are reading from consecutive elements.
SmallVector<SDValue, 4> Pieces;
for (int I = 0, N = ResultVT.getVectorNumElements(); I != N; I += 2) {
  if (elementPairIsContiguous(SVN->getMask(), I)) {
    const int Idx = SVN->getMaskElt(I);
    int VecIdx = Idx < SrcNumElts ? 0 : 1;
    int EltIdx = Idx < SrcNumElts ? Idx : Idx - SrcNumElts;
    SDValue SubVec = DAG.getNode(ISD::EXTRACT_SUBVECTOR, SL,
                                  PackVT, SVN->getOperand(VecIdx),
                                  DAG.getConstant(EltIdx, SL, MVT::i32));
    Pieces.push_back(SubVec);
  } else {
    const int Idx0 = SVN->getMaskElt(I);
    const int Idx1 = SVN->getMaskElt(I + 1);
    int VecIdx0 = Idx0 < SrcNumElts ? 0 : 1;
    int VecIdx1 = Idx1 < SrcNumElts ? 0 : 1;
    int EltIdx0 = Idx0 < SrcNumElts ? Idx0 : Idx0 - SrcNumElts;
    int EltIdx1 = Idx1 < SrcNumElts ? Idx1 : Idx1 - SrcNumElts;

    SDValue Vec0 = SVN->getOperand(VecIdx0);
    SDValue Elt0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, EltVT,
                               Vec0, DAG.getConstant(EltIdx0, SL, MVT::i32));

    SDValue Vec1 = SVN->getOperand(VecIdx1);
    SDValue Elt1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, EltVT,
                               Vec1, DAG.getConstant(EltIdx1, SL, MVT::i32));
    Pieces.push_back(DAG.getBuildVector(PackVT, SL, { Elt0, Elt1 }));
  }
}

return DAG.getNode(ISD::CONCAT_VECTORS, SL, ResultVT, Pieces);
5631}

5633SDValue SITargetLowering::lowerBUILD_VECTOR(SDValue Op,
                                          SelectionDAG &DAG) const {
SDLoc SL(Op);
EVT VT = Op.getValueType();

if (VT == MVT::v4i16 || VT == MVT::v4f16) {
  EVT HalfVT = MVT::getVectorVT(VT.getVectorElementType().getSimpleVT(), 2);

  // Turn into pair of packed build_vectors.
  // TODO: Special case for constants that can be materialized with s_mov_b64.
  SDValue Lo = DAG.getBuildVector(HalfVT, SL,
                                  { Op.getOperand(0), Op.getOperand(1) });
  SDValue Hi = DAG.getBuildVector(HalfVT, SL,
                                  { Op.getOperand(2), Op.getOperand(3) });

  SDValue CastLo = DAG.getNode(ISD::BITCAST, SL, MVT::i32, Lo);
  SDValue CastHi = DAG.getNode(ISD::BITCAST, SL, MVT::i32, Hi);

  SDValue Blend = DAG.getBuildVector(MVT::v2i32, SL, { CastLo, CastHi });
  return DAG.getNode(ISD::BITCAST, SL, VT, Blend);
}

assert(VT == MVT::v2f16 || VT == MVT::v2i16)((void)0);
assert(!Subtarget->hasVOP3PInsts() && "this should be legal")((void)0);

SDValue Lo = Op.getOperand(0);
SDValue Hi = Op.getOperand(1);

// Avoid adding defined bits with the zero_extend.
if (Hi.isUndef()) {
  Lo = DAG.getNode(ISD::BITCAST, SL, MVT::i16, Lo);
  SDValue ExtLo = DAG.getNode(ISD::ANY_EXTEND, SL, MVT::i32, Lo);
  return DAG.getNode(ISD::BITCAST, SL, VT, ExtLo);
}

Hi = DAG.getNode(ISD::BITCAST, SL, MVT::i16, Hi);
Hi = DAG.getNode(ISD::ZERO_EXTEND, SL, MVT::i32, Hi);

SDValue ShlHi = DAG.getNode(ISD::SHL, SL, MVT::i32, Hi,
                            DAG.getConstant(16, SL, MVT::i32));
if (Lo.isUndef())
  return DAG.getNode(ISD::BITCAST, SL, VT, ShlHi);

Lo = DAG.getNode(ISD::BITCAST, SL, MVT::i16, Lo);
Lo = DAG.getNode(ISD::ZERO_EXTEND, SL, MVT::i32, Lo);

SDValue Or = DAG.getNode(ISD::OR, SL, MVT::i32, Lo, ShlHi);
return DAG.getNode(ISD::BITCAST, SL, VT, Or);
5681}

5683bool
5684SITargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
// We can fold offsets for anything that doesn't require a GOT relocation.
return (GA->getAddressSpace() == AMDGPUAS::GLOBAL_ADDRESS ||
        GA->getAddressSpace() == AMDGPUAS::CONSTANT_ADDRESS ||
        GA->getAddressSpace() == AMDGPUAS::CONSTANT_ADDRESS_32BIT) &&
       !shouldEmitGOTReloc(GA->getGlobal());
5690}

5692static SDValue
5693buildPCRelGlobalAddress(SelectionDAG &DAG, const GlobalValue *GV,
                      const SDLoc &DL, int64_t Offset, EVT PtrVT,
                      unsigned GAFlags = SIInstrInfo::MO_NONE) {
assert(isInt<32>(Offset + 4) && "32-bit offset is expected!")((void)0);
// In order to support pc-relative addressing, the PC_ADD_REL_OFFSET SDNode is
// lowered to the following code sequence:
//
// For constant address space:
//   s_getpc_b64 s[0:1]
//   s_add_u32 s0, s0, $symbol
//   s_addc_u32 s1, s1, 0
//
//   s_getpc_b64 returns the address of the s_add_u32 instruction and then
//   a fixup or relocation is emitted to replace $symbol with a literal
//   constant, which is a pc-relative offset from the encoding of the $symbol
//   operand to the global variable.
//
// For global address space:
//   s_getpc_b64 s[0:1]
//   s_add_u32 s0, s0, $symbol@{gotpc}rel32@lo
//   s_addc_u32 s1, s1, $symbol@{gotpc}rel32@hi
//
//   s_getpc_b64 returns the address of the s_add_u32 instruction and then
//   fixups or relocations are emitted to replace $symbol@*@lo and
//   $symbol@*@hi with lower 32 bits and higher 32 bits of a literal constant,
//   which is a 64-bit pc-relative offset from the encoding of the $symbol
//   operand to the global variable.
//
// What we want here is an offset from the value returned by s_getpc
// (which is the address of the s_add_u32 instruction) to the global
// variable, but since the encoding of $symbol starts 4 bytes after the start
// of the s_add_u32 instruction, we end up with an offset that is 4 bytes too
// small. This requires us to add 4 to the global variable offset in order to
// compute the correct address. Similarly for the s_addc_u32 instruction, the
// encoding of $symbol starts 12 bytes after the start of the s_add_u32
// instruction.
SDValue PtrLo =
    DAG.getTargetGlobalAddress(GV, DL, MVT::i32, Offset + 4, GAFlags);
SDValue PtrHi;
if (GAFlags == SIInstrInfo::MO_NONE) {
  PtrHi = DAG.getTargetConstant(0, DL, MVT::i32);
} else {
  PtrHi =
      DAG.getTargetGlobalAddress(GV, DL, MVT::i32, Offset + 12, GAFlags + 1);
}
return DAG.getNode(AMDGPUISD::PC_ADD_REL_OFFSET, DL, PtrVT, PtrLo, PtrHi);
5739}

5741SDValue SITargetLowering::LowerGlobalAddress(AMDGPUMachineFunction *MFI,
                                           SDValue Op,
                                           SelectionDAG &DAG) const {
GlobalAddressSDNode *GSD = cast<GlobalAddressSDNode>(Op);
SDLoc DL(GSD);
EVT PtrVT = Op.getValueType();

const GlobalValue *GV = GSD->getGlobal();
if ((GSD->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS &&
     shouldUseLDSConstAddress(GV)) ||
    GSD->getAddressSpace() == AMDGPUAS::REGION_ADDRESS ||
    GSD->getAddressSpace() == AMDGPUAS::PRIVATE_ADDRESS) {
  if (GSD->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS &&
      GV->hasExternalLinkage()) {
    Type *Ty = GV->getValueType();
    // HIP uses an unsized array `extern __shared__ T s[]` or similar
    // zero-sized type in other languages to declare the dynamic shared
    // memory which size is not known at the compile time. They will be
    // allocated by the runtime and placed directly after the static
    // allocated ones. They all share the same offset.
    if (DAG.getDataLayout().getTypeAllocSize(Ty).isZero()) {
      assert(PtrVT == MVT::i32 && "32-bit pointer is expected.")((void)0);
      // Adjust alignment for that dynamic shared memory array.
      MFI->setDynLDSAlign(DAG.getDataLayout(), *cast<GlobalVariable>(GV));
      return SDValue(
          DAG.getMachineNode(AMDGPU::GET_GROUPSTATICSIZE, DL, PtrVT), 0);
    }
  }
  return AMDGPUTargetLowering::LowerGlobalAddress(MFI, Op, DAG);
}

if (GSD->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS) {
  SDValue GA = DAG.getTargetGlobalAddress(GV, DL, MVT::i32, GSD->getOffset(),
                                          SIInstrInfo::MO_ABS32_LO);
  return DAG.getNode(AMDGPUISD::LDS, DL, MVT::i32, GA);
}

if (shouldEmitFixup(GV))
  return buildPCRelGlobalAddress(DAG, GV, DL, GSD->getOffset(), PtrVT);
else if (shouldEmitPCReloc(GV))
  return buildPCRelGlobalAddress(DAG, GV, DL, GSD->getOffset(), PtrVT,
                                 SIInstrInfo::MO_REL32);

SDValue GOTAddr = buildPCRelGlobalAddress(DAG, GV, DL, 0, PtrVT,
                                          SIInstrInfo::MO_GOTPCREL32);

Type *Ty = PtrVT.getTypeForEVT(*DAG.getContext());
PointerType *PtrTy = PointerType::get(Ty, AMDGPUAS::CONSTANT_ADDRESS);
const DataLayout &DataLayout = DAG.getDataLayout();
Align Alignment = DataLayout.getABITypeAlign(PtrTy);
MachinePointerInfo PtrInfo
  = MachinePointerInfo::getGOT(DAG.getMachineFunction());

return DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), GOTAddr, PtrInfo, Alignment,
                   MachineMemOperand::MODereferenceable |
                       MachineMemOperand::MOInvariant);
5797}

5799SDValue SITargetLowering::copyToM0(SelectionDAG &DAG, SDValue Chain,
                                 const SDLoc &DL, SDValue V) const {
// We can't use S_MOV_B32 directly, because there is no way to specify m0 as
// the destination register.
//
// We can't use CopyToReg, because MachineCSE won't combine COPY instructions,
// so we will end up with redundant moves to m0.
//
// We use a pseudo to ensure we emit s_mov_b32 with m0 as the direct result.

// A Null SDValue creates a glue result.
SDNode *M0 = DAG.getMachineNode(AMDGPU::SI_INIT_M0, DL, MVT::Other, MVT::Glue,
                                V, Chain);
return SDValue(M0, 0);
5813}

5815SDValue SITargetLowering::lowerImplicitZextParam(SelectionDAG &DAG,
                                               SDValue Op,
                                               MVT VT,
                                               unsigned Offset) const {
SDLoc SL(Op);
SDValue Param = lowerKernargMemParameter(
    DAG, MVT::i32, MVT::i32, SL, DAG.getEntryNode(), Offset, Align(4), false);
// The local size values will have the hi 16-bits as zero.
return DAG.getNode(ISD::AssertZext, SL, MVT::i32, Param,
                   DAG.getValueType(VT));
5825}

5827static SDValue emitNonHSAIntrinsicError(SelectionDAG &DAG, const SDLoc &DL,
                                      EVT VT) {
DiagnosticInfoUnsupported BadIntrin(DAG.getMachineFunction().getFunction(),
                                    "non-hsa intrinsic with hsa target",
                                    DL.getDebugLoc());
DAG.getContext()->diagnose(BadIntrin);
return DAG.getUNDEF(VT);
5834}

5836static SDValue emitRemovedIntrinsicError(SelectionDAG &DAG, const SDLoc &DL,
                                       EVT VT) {
DiagnosticInfoUnsupported BadIntrin(DAG.getMachineFunction().getFunction(),
                                    "intrinsic not supported on subtarget",
                                    DL.getDebugLoc());
DAG.getContext()->diagnose(BadIntrin);
return DAG.getUNDEF(VT);
5843}

5845static SDValue getBuildDwordsVector(SelectionDAG &DAG, SDLoc DL,
                                  ArrayRef<SDValue> Elts) {
assert(!Elts.empty())((void)0);
MVT Type;
unsigned NumElts = Elts.size();

if (NumElts <= 8) {
  Type = MVT::getVectorVT(MVT::f32, NumElts);
} else {
  assert(Elts.size() <= 16)((void)0);
  Type = MVT::v16f32;
  NumElts = 16;
}

SmallVector<SDValue, 16> VecElts(NumElts);
for (unsigned i = 0; i < Elts.size(); ++i) {
  SDValue Elt = Elts[i];
  if (Elt.getValueType() != MVT::f32)
    Elt = DAG.getBitcast(MVT::f32, Elt);
  VecElts[i] = Elt;
}
for (unsigned i = Elts.size(); i < NumElts; ++i)
  VecElts[i] = DAG.getUNDEF(MVT::f32);

if (NumElts == 1)
  return VecElts[0];
return DAG.getBuildVector(Type, DL, VecElts);
5872}

5874static SDValue padEltsToUndef(SelectionDAG &DAG, const SDLoc &DL, EVT CastVT,
                            SDValue Src, int ExtraElts) {
EVT SrcVT = Src.getValueType();

SmallVector<SDValue, 8> Elts;

if (SrcVT.isVector())
  DAG.ExtractVectorElements(Src, Elts);
else
  Elts.push_back(Src);

SDValue Undef = DAG.getUNDEF(SrcVT.getScalarType());
while (ExtraElts--)
  Elts.push_back(Undef);

return DAG.getBuildVector(CastVT, DL, Elts);
5890}

5892// Re-construct the required return value for a image load intrinsic.
5893// This is more complicated due to the optional use TexFailCtrl which means the required
5894// return type is an aggregate
5895static SDValue constructRetValue(SelectionDAG &DAG,
                               MachineSDNode *Result,
                               ArrayRef<EVT> ResultTypes,
                               bool IsTexFail, bool Unpacked, bool IsD16,
                               int DMaskPop, int NumVDataDwords,
                               const SDLoc &DL) {
// Determine the required return type. This is the same regardless of IsTexFail flag
EVT ReqRetVT = ResultTypes[0];
int ReqRetNumElts = ReqRetVT.isVector() ? ReqRetVT.getVectorNumElements() : 1;
int NumDataDwords = (!IsD16 || (IsD16 && Unpacked)) ?
  ReqRetNumElts : (ReqRetNumElts + 1) / 2;

int MaskPopDwords = (!IsD16 || (IsD16 && Unpacked)) ?
  DMaskPop : (DMaskPop + 1) / 2;

MVT DataDwordVT = NumDataDwords == 1 ?
  MVT::i32 : MVT::getVectorVT(MVT::i32, NumDataDwords);

MVT MaskPopVT = MaskPopDwords == 1 ?
  MVT::i32 : MVT::getVectorVT(MVT::i32, MaskPopDwords);

SDValue Data(Result, 0);
SDValue TexFail;

if (DMaskPop > 0 && Data.getValueType() != MaskPopVT) {
  SDValue ZeroIdx = DAG.getConstant(0, DL, MVT::i32);
  if (MaskPopVT.isVector()) {
    Data = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MaskPopVT,
                       SDValue(Result, 0), ZeroIdx);
  } else {
    Data = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MaskPopVT,
                       SDValue(Result, 0), ZeroIdx);
  }
}

if (DataDwordVT.isVector())
  Data = padEltsToUndef(DAG, DL, DataDwordVT, Data,
                        NumDataDwords - MaskPopDwords);

if (IsD16)
  Data = adjustLoadValueTypeImpl(Data, ReqRetVT, DL, DAG, Unpacked);

EVT LegalReqRetVT = ReqRetVT;
if (!ReqRetVT.isVector()) {
  Data = DAG.getNode(ISD::TRUNCATE, DL, ReqRetVT.changeTypeToInteger(), Data);
} else {
  // We need to widen the return vector to a legal type
  if ((ReqRetVT.getVectorNumElements() % 2) == 1 &&
      ReqRetVT.getVectorElementType().getSizeInBits() == 16) {
    LegalReqRetVT =
        EVT::getVectorVT(*DAG.getContext(), ReqRetVT.getVectorElementType(),
                         ReqRetVT.getVectorNumElements() + 1);
  }
}
Data = DAG.getNode(ISD::BITCAST, DL, LegalReqRetVT, Data);

if (IsTexFail) {
  TexFail =
      DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, SDValue(Result, 0),
                  DAG.getConstant(MaskPopDwords, DL, MVT::i32));

  return DAG.getMergeValues({Data, TexFail, SDValue(Result, 1)}, DL);
}

if (Result->getNumValues() == 1)
  return Data;

return DAG.getMergeValues({Data, SDValue(Result, 1)}, DL);
5963}

5965static bool parseTexFail(SDValue TexFailCtrl, SelectionDAG &DAG, SDValue *TFE,
                       SDValue *LWE, bool &IsTexFail) {
auto TexFailCtrlConst = cast<ConstantSDNode>(TexFailCtrl.getNode());

uint64_t Value = TexFailCtrlConst->getZExtValue();
if (Value) {
  IsTexFail = true;
}

SDLoc DL(TexFailCtrlConst);
*TFE = DAG.getTargetConstant((Value & 0x1) ? 1 : 0, DL, MVT::i32);
Value &= ~(uint64_t)0x1;
*LWE = DAG.getTargetConstant((Value & 0x2) ? 1 : 0, DL, MVT::i32);
Value &= ~(uint64_t)0x2;

return Value == 0;
5981}

5983static void packImage16bitOpsToDwords(SelectionDAG &DAG, SDValue Op,
                                    MVT PackVectorVT,
                                    SmallVectorImpl<SDValue> &PackedAddrs,
                                    unsigned DimIdx, unsigned EndIdx,
                                    unsigned NumGradients) {
SDLoc DL(Op);
for (unsigned I = DimIdx; I < EndIdx; I++) {
  SDValue Addr = Op.getOperand(I);

  // Gradients are packed with undef for each coordinate.
  // In <hi 16 bit>,<lo 16 bit> notation, the registers look like this:
  // 1D: undef,dx/dh; undef,dx/dv
  // 2D: dy/dh,dx/dh; dy/dv,dx/dv
  // 3D: dy/dh,dx/dh; undef,dz/dh; dy/dv,dx/dv; undef,dz/dv
  if (((I + 1) >= EndIdx) ||
      ((NumGradients / 2) % 2 == 1 && (I == DimIdx + (NumGradients / 2) - 1 ||
                                       I == DimIdx + NumGradients - 1))) {
    if (Addr.getValueType() != MVT::i16)
      Addr = DAG.getBitcast(MVT::i16, Addr);
    Addr = DAG.getNode(ISD::ANY_EXTEND, DL, MVT::i32, Addr);
  } else {
    Addr = DAG.getBuildVector(PackVectorVT, DL, {Addr, Op.getOperand(I + 1)});
    I++;
  }
  Addr = DAG.getBitcast(MVT::f32, Addr);
  PackedAddrs.push_back(Addr);
}
6010}

6012SDValue SITargetLowering::lowerImage(SDValue Op,
                                   const AMDGPU::ImageDimIntrinsicInfo *Intr,
                                   SelectionDAG &DAG, bool WithChain) const {
SDLoc DL(Op);
MachineFunction &MF = DAG.getMachineFunction();
const GCNSubtarget* ST = &MF.getSubtarget<GCNSubtarget>();
const AMDGPU::MIMGBaseOpcodeInfo *BaseOpcode =
    AMDGPU::getMIMGBaseOpcodeInfo(Intr->BaseOpcode);
const AMDGPU::MIMGDimInfo *DimInfo = AMDGPU::getMIMGDimInfo(Intr->Dim);
const AMDGPU::MIMGLZMappingInfo *LZMappingInfo =
    AMDGPU::getMIMGLZMappingInfo(Intr->BaseOpcode);
const AMDGPU::MIMGMIPMappingInfo *MIPMappingInfo =
    AMDGPU::getMIMGMIPMappingInfo(Intr->BaseOpcode);
unsigned IntrOpcode = Intr->BaseOpcode;
bool IsGFX10Plus = AMDGPU::isGFX10Plus(*Subtarget);

SmallVector<EVT, 3> ResultTypes(Op->values());
SmallVector<EVT, 3> OrigResultTypes(Op->values());
bool IsD16 = false;
bool IsG16 = false;
bool IsA16 = false;
SDValue VData;
int NumVDataDwords;
bool AdjustRetType = false;

// Offset of intrinsic arguments
const unsigned ArgOffset = WithChain ? 2 : 1;

unsigned DMask;
unsigned DMaskLanes = 0;

if (BaseOpcode->Atomic) {
  VData = Op.getOperand(2);

  bool Is64Bit = VData.getValueType() == MVT::i64;
  if (BaseOpcode->AtomicX2) {
    SDValue VData2 = Op.getOperand(3);
    VData = DAG.getBuildVector(Is64Bit ? MVT::v2i64 : MVT::v2i32, DL,
                               {VData, VData2});
    if (Is64Bit)
      VData = DAG.getBitcast(MVT::v4i32, VData);

    ResultTypes[0] = Is64Bit ? MVT::v2i64 : MVT::v2i32;
    DMask = Is64Bit ? 0xf : 0x3;
    NumVDataDwords = Is64Bit ? 4 : 2;
  } else {
    DMask = Is64Bit ? 0x3 : 0x1;
    NumVDataDwords = Is64Bit ? 2 : 1;
  }
} else {
  auto *DMaskConst =
      cast<ConstantSDNode>(Op.getOperand(ArgOffset + Intr->DMaskIndex));
  DMask = DMaskConst->getZExtValue();
  DMaskLanes = BaseOpcode->Gather4 ? 4 : countPopulation(DMask);

  if (BaseOpcode->Store) {
    VData = Op.getOperand(2);

    MVT StoreVT = VData.getSimpleValueType();
    if (StoreVT.getScalarType() == MVT::f16) {
      if (!Subtarget->hasD16Images() || !BaseOpcode->HasD16)
        return Op; // D16 is unsupported for this instruction

      IsD16 = true;
      VData = handleD16VData(VData, DAG, true);
    }

    NumVDataDwords = (VData.getValueType().getSizeInBits() + 31) / 32;
  } else {
    // Work out the num dwords based on the dmask popcount and underlying type
    // and whether packing is supported.
    MVT LoadVT = ResultTypes[0].getSimpleVT();
    if (LoadVT.getScalarType() == MVT::f16) {
      if (!Subtarget->hasD16Images() || !BaseOpcode->HasD16)
        return Op; // D16 is unsupported for this instruction

      IsD16 = true;
    }

    // Confirm that the return type is large enough for the dmask specified
    if ((LoadVT.isVector() && LoadVT.getVectorNumElements() < DMaskLanes) ||
        (!LoadVT.isVector() && DMaskLanes > 1))
        return Op;

    // The sq block of gfx8 and gfx9 do not estimate register use correctly
    // for d16 image_gather4, image_gather4_l, and image_gather4_lz
    // instructions.
    if (IsD16 && !Subtarget->hasUnpackedD16VMem() &&
        !(BaseOpcode->Gather4 && Subtarget->hasImageGather4D16Bug()))
      NumVDataDwords = (DMaskLanes + 1) / 2;
    else
      NumVDataDwords = DMaskLanes;

    AdjustRetType = true;
  }
}

unsigned VAddrEnd = ArgOffset + Intr->VAddrEnd;
SmallVector<SDValue, 4> VAddrs;

// Optimize _L to _LZ when _L is zero
if (LZMappingInfo) {
  if (auto *ConstantLod = dyn_cast<ConstantFPSDNode>(
          Op.getOperand(ArgOffset + Intr->LodIndex))) {
    if (ConstantLod->isZero() || ConstantLod->isNegative()) {
      IntrOpcode = LZMappingInfo->LZ;  // set new opcode to _lz variant of _l
      VAddrEnd--;                      // remove 'lod'
    }
  }
}

// Optimize _mip away, when 'lod' is zero
if (MIPMappingInfo) {
  if (auto *ConstantLod = dyn_cast<ConstantSDNode>(
          Op.getOperand(ArgOffset + Intr->MipIndex))) {
    if (ConstantLod->isNullValue()) {
      IntrOpcode = MIPMappingInfo->NONMIP;  // set new opcode to variant without _mip
      VAddrEnd--;                           // remove 'mip'
    }
  }
}

// Push back extra arguments.
for (unsigned I = Intr->VAddrStart; I < Intr->GradientStart; I++)
  VAddrs.push_back(Op.getOperand(ArgOffset + I));

// Check for 16 bit addresses or derivatives and pack if true.
MVT VAddrVT =
    Op.getOperand(ArgOffset + Intr->GradientStart).getSimpleValueType();
MVT VAddrScalarVT = VAddrVT.getScalarType();
MVT GradPackVectorVT = VAddrScalarVT == MVT::f16 ? MVT::v2f16 : MVT::v2i16;
IsG16 = VAddrScalarVT == MVT::f16 || VAddrScalarVT == MVT::i16;

VAddrVT = Op.getOperand(ArgOffset + Intr->CoordStart).getSimpleValueType();
VAddrScalarVT = VAddrVT.getScalarType();
MVT AddrPackVectorVT = VAddrScalarVT == MVT::f16 ? MVT::v2f16 : MVT::v2i16;
IsA16 = VAddrScalarVT == MVT::f16 || VAddrScalarVT == MVT::i16;

if (BaseOpcode->Gradients && !ST->hasG16() && (IsA16 != IsG16)) {
  // 16 bit gradients are supported, but are tied to the A16 control
  // so both gradients and addresses must be 16 bit
  LLVM_DEBUG(do { } while (false)
      dbgs() << "Failed to lower image intrinsic: 16 bit addresses "do { } while (false)
                "require 16 bit args for both gradients and addresses")do { } while (false);
  return Op;
}

if (IsA16) {
  if (!ST->hasA16()) {
    LLVM_DEBUG(dbgs() << "Failed to lower image intrinsic: Target does not "do { } while (false)
                         "support 16 bit addresses\n")do { } while (false);
    return Op;
  }
}

// We've dealt with incorrect input so we know that if IsA16, IsG16
// are set then we have to compress/pack operands (either address,
// gradient or both)
// In the case where a16 and gradients are tied (no G16 support) then we
// have already verified that both IsA16 and IsG16 are true
if (BaseOpcode->Gradients && IsG16 && ST->hasG16()) {
  // Activate g16
  const AMDGPU::MIMGG16MappingInfo *G16MappingInfo =
      AMDGPU::getMIMGG16MappingInfo(Intr->BaseOpcode);
  IntrOpcode = G16MappingInfo->G16; // set new opcode to variant with _g16
}

// Add gradients (packed or unpacked)
if (IsG16) {
  // Pack the gradients
  // const int PackEndIdx = IsA16 ? VAddrEnd : (ArgOffset + Intr->CoordStart);
  packImage16bitOpsToDwords(DAG, Op, GradPackVectorVT, VAddrs,
                            ArgOffset + Intr->GradientStart,
                            ArgOffset + Intr->CoordStart, Intr->NumGradients);
} else {
  for (unsigned I = ArgOffset + Intr->GradientStart;
       I < ArgOffset + Intr->CoordStart; I++)
    VAddrs.push_back(Op.getOperand(I));
}

// Add addresses (packed or unpacked)
if (IsA16) {
  packImage16bitOpsToDwords(DAG, Op, AddrPackVectorVT, VAddrs,
                            ArgOffset + Intr->CoordStart, VAddrEnd,
                            0 /* No gradients */);
} else {
  // Add uncompressed address
  for (unsigned I = ArgOffset + Intr->CoordStart; I < VAddrEnd; I++)
    VAddrs.push_back(Op.getOperand(I));
}

// If the register allocator cannot place the address registers contiguously
// without introducing moves, then using the non-sequential address encoding
// is always preferable, since it saves VALU instructions and is usually a
// wash in terms of code size or even better.
//
// However, we currently have no way of hinting to the register allocator that
// MIMG addresses should be placed contiguously when it is possible to do so,
// so force non-NSA for the common 2-address case as a heuristic.
//
// SIShrinkInstructions will convert NSA encodings to non-NSA after register
// allocation when possible.
bool UseNSA = ST->hasFeature(AMDGPU::FeatureNSAEncoding) &&
              VAddrs.size() >= 3 &&
              VAddrs.size() <= (unsigned)ST->getNSAMaxSize();
SDValue VAddr;
if (!UseNSA)
  VAddr = getBuildDwordsVector(DAG, DL, VAddrs);

SDValue True = DAG.getTargetConstant(1, DL, MVT::i1);
SDValue False = DAG.getTargetConstant(0, DL, MVT::i1);
SDValue Unorm;
if (!BaseOpcode->Sampler) {
  Unorm = True;
} else {
  auto UnormConst =
      cast<ConstantSDNode>(Op.getOperand(ArgOffset + Intr->UnormIndex));

  Unorm = UnormConst->getZExtValue() ? True : False;
}

SDValue TFE;
SDValue LWE;
SDValue TexFail = Op.getOperand(ArgOffset + Intr->TexFailCtrlIndex);
bool IsTexFail = false;
if (!parseTexFail(TexFail, DAG, &TFE, &LWE, IsTexFail))
  return Op;

if (IsTexFail) {
  if (!DMaskLanes) {
    // Expecting to get an error flag since TFC is on - and dmask is 0
    // Force dmask to be at least 1 otherwise the instruction will fail
    DMask = 0x1;
    DMaskLanes = 1;
    NumVDataDwords = 1;
  }
  NumVDataDwords += 1;
  AdjustRetType = true;
}

// Has something earlier tagged that the return type needs adjusting
// This happens if the instruction is a load or has set TexFailCtrl flags
if (AdjustRetType) {
  // NumVDataDwords reflects the true number of dwords required in the return type
  if (DMaskLanes == 0 && !BaseOpcode->Store) {
    // This is a no-op load. This can be eliminated
    SDValue Undef = DAG.getUNDEF(Op.getValueType());
    if (isa<MemSDNode>(Op))
      return DAG.getMergeValues({Undef, Op.getOperand(0)}, DL);
    return Undef;
  }

  EVT NewVT = NumVDataDwords > 1 ?
                EVT::getVectorVT(*DAG.getContext(), MVT::i32, NumVDataDwords)
              : MVT::i32;

  ResultTypes[0] = NewVT;
  if (ResultTypes.size() == 3) {
    // Original result was aggregate type used for TexFailCtrl results
    // The actual instruction returns as a vector type which has now been
    // created. Remove the aggregate result.
    ResultTypes.erase(&ResultTypes[1]);
  }
}

unsigned CPol = cast<ConstantSDNode>(
    Op.getOperand(ArgOffset + Intr->CachePolicyIndex))->getZExtValue();
if (BaseOpcode->Atomic)
  CPol |= AMDGPU::CPol::GLC; // TODO no-return optimization
if (CPol & ~AMDGPU::CPol::ALL)
  return Op;

SmallVector<SDValue, 26> Ops;
if (BaseOpcode->Store || BaseOpcode->Atomic)
  Ops.push_back(VData); // vdata
if (UseNSA)
  append_range(Ops, VAddrs);
else
  Ops.push_back(VAddr);
Ops.push_back(Op.getOperand(ArgOffset + Intr->RsrcIndex));
if (BaseOpcode->Sampler)
  Ops.push_back(Op.getOperand(ArgOffset + Intr->SampIndex));
Ops.push_back(DAG.getTargetConstant(DMask, DL, MVT::i32));
if (IsGFX10Plus)
  Ops.push_back(DAG.getTargetConstant(DimInfo->Encoding, DL, MVT::i32));
Ops.push_back(Unorm);
Ops.push_back(DAG.getTargetConstant(CPol, DL, MVT::i32));
Ops.push_back(IsA16 &&  // r128, a16 for gfx9
              ST->hasFeature(AMDGPU::FeatureR128A16) ? True : False);
if (IsGFX10Plus)
  Ops.push_back(IsA16 ? True : False);
if (!Subtarget->hasGFX90AInsts()) {
  Ops.push_back(TFE); //tfe
} else if (cast<ConstantSDNode>(TFE)->getZExtValue()) {
  report_fatal_error("TFE is not supported on this GPU");
}
Ops.push_back(LWE); // lwe
if (!IsGFX10Plus)
  Ops.push_back(DimInfo->DA ? True : False);
if (BaseOpcode->HasD16)
  Ops.push_back(IsD16 ? True : False);
if (isa<MemSDNode>(Op))
  Ops.push_back(Op.getOperand(0)); // chain

int NumVAddrDwords =
    UseNSA ? VAddrs.size() : VAddr.getValueType().getSizeInBits() / 32;
int Opcode = -1;

if (IsGFX10Plus) {
  Opcode = AMDGPU::getMIMGOpcode(IntrOpcode,
                                 UseNSA ? AMDGPU::MIMGEncGfx10NSA
                                        : AMDGPU::MIMGEncGfx10Default,
                                 NumVDataDwords, NumVAddrDwords);
} else {
  if (Subtarget->hasGFX90AInsts()) {
    Opcode = AMDGPU::getMIMGOpcode(IntrOpcode, AMDGPU::MIMGEncGfx90a,
                                   NumVDataDwords, NumVAddrDwords);
    if (Opcode == -1)
      report_fatal_error(
          "requested image instruction is not supported on this GPU");
  }
  if (Opcode == -1 &&
      Subtarget->getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
    Opcode = AMDGPU::getMIMGOpcode(IntrOpcode, AMDGPU::MIMGEncGfx8,
                                   NumVDataDwords, NumVAddrDwords);
  if (Opcode == -1)
    Opcode = AMDGPU::getMIMGOpcode(IntrOpcode, AMDGPU::MIMGEncGfx6,
                                   NumVDataDwords, NumVAddrDwords);
}
assert(Opcode != -1)((void)0);

MachineSDNode *NewNode = DAG.getMachineNode(Opcode, DL, ResultTypes, Ops);
if (auto MemOp = dyn_cast<MemSDNode>(Op)) {
  MachineMemOperand *MemRef = MemOp->getMemOperand();
  DAG.setNodeMemRefs(NewNode, {MemRef});
}

if (BaseOpcode->AtomicX2) {
  SmallVector<SDValue, 1> Elt;
  DAG.ExtractVectorElements(SDValue(NewNode, 0), Elt, 0, 1);
  return DAG.getMergeValues({Elt[0], SDValue(NewNode, 1)}, DL);
}
if (BaseOpcode->Store)
  return SDValue(NewNode, 0);
return constructRetValue(DAG, NewNode,
                         OrigResultTypes, IsTexFail,
                         Subtarget->hasUnpackedD16VMem(), IsD16,
                         DMaskLanes, NumVDataDwords, DL);
6360}

6362SDValue SITargetLowering::lowerSBuffer(EVT VT, SDLoc DL, SDValue Rsrc,
                                     SDValue Offset, SDValue CachePolicy,
                                     SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();

const DataLayout &DataLayout = DAG.getDataLayout();
Align Alignment =
    DataLayout.getABITypeAlign(VT.getTypeForEVT(*DAG.getContext()));

MachineMemOperand *MMO = MF.getMachineMemOperand(
    MachinePointerInfo(),
    MachineMemOperand::MOLoad | MachineMemOperand::MODereferenceable |
        MachineMemOperand::MOInvariant,
    VT.getStoreSize(), Alignment);

if (!Offset->isDivergent()) {
  SDValue Ops[] = {
      Rsrc,
      Offset, // Offset
      CachePolicy
  };

  // Widen vec3 load to vec4.
  if (VT.isVector() && VT.getVectorNumElements() == 3) {
    EVT WidenedVT =
        EVT::getVectorVT(*DAG.getContext(), VT.getVectorElementType(), 4);
    auto WidenedOp = DAG.getMemIntrinsicNode(
        AMDGPUISD::SBUFFER_LOAD, DL, DAG.getVTList(WidenedVT), Ops, WidenedVT,
        MF.getMachineMemOperand(MMO, 0, WidenedVT.getStoreSize()));
    auto Subvector = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, WidenedOp,
                                 DAG.getVectorIdxConstant(0, DL));
    return Subvector;
  }

  return DAG.getMemIntrinsicNode(AMDGPUISD::SBUFFER_LOAD, DL,
                                 DAG.getVTList(VT), Ops, VT, MMO);
}

// We have a divergent offset. Emit a MUBUF buffer load instead. We can
// assume that the buffer is unswizzled.
SmallVector<SDValue, 4> Loads;
unsigned NumLoads = 1;
MVT LoadVT = VT.getSimpleVT();
unsigned NumElts = LoadVT.isVector() ? LoadVT.getVectorNumElements() : 1;
assert((LoadVT.getScalarType() == MVT::i32 ||((void)0)
        LoadVT.getScalarType() == MVT::f32))((void)0);

if (NumElts == 8 || NumElts == 16) {
  NumLoads = NumElts / 4;
  LoadVT = MVT::getVectorVT(LoadVT.getScalarType(), 4);
}

SDVTList VTList = DAG.getVTList({LoadVT, MVT::Glue});
SDValue Ops[] = {
    DAG.getEntryNode(),                               // Chain
    Rsrc,                                             // rsrc
    DAG.getConstant(0, DL, MVT::i32),                 // vindex
    {},                                               // voffset
    {},                                               // soffset
    {},                                               // offset
    CachePolicy,                                      // cachepolicy
    DAG.getTargetConstant(0, DL, MVT::i1),            // idxen
};

// Use the alignment to ensure that the required offsets will fit into the
// immediate offsets.
setBufferOffsets(Offset, DAG, &Ops[3],
                 NumLoads > 1 ? Align(16 * NumLoads) : Align(4));

uint64_t InstOffset = cast<ConstantSDNode>(Ops[5])->getZExtValue();
for (unsigned i = 0; i < NumLoads; ++i) {
  Ops[5] = DAG.getTargetConstant(InstOffset + 16 * i, DL, MVT::i32);
  Loads.push_back(getMemIntrinsicNode(AMDGPUISD::BUFFER_LOAD, DL, VTList, Ops,
                                      LoadVT, MMO, DAG));
}

if (NumElts == 8 || NumElts == 16)
  return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, Loads);

return Loads[0];
6442}

6444SDValue SITargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
                                                SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
auto MFI = MF.getInfo<SIMachineFunctionInfo>();

EVT VT = Op.getValueType();
SDLoc DL(Op);
unsigned IntrinsicID = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();

// TODO: Should this propagate fast-math-flags?

switch (IntrinsicID) {
case Intrinsic::amdgcn_implicit_buffer_ptr: {
  if (getSubtarget()->isAmdHsaOrMesa(MF.getFunction()))
    return emitNonHSAIntrinsicError(DAG, DL, VT);
  return getPreloadedValue(DAG, *MFI, VT,
                           AMDGPUFunctionArgInfo::IMPLICIT_BUFFER_PTR);
}
case Intrinsic::amdgcn_dispatch_ptr:
case Intrinsic::amdgcn_queue_ptr: {
  if (!Subtarget->isAmdHsaOrMesa(MF.getFunction())) {
    DiagnosticInfoUnsupported BadIntrin(
        MF.getFunction(), "unsupported hsa intrinsic without hsa target",
        DL.getDebugLoc());
    DAG.getContext()->diagnose(BadIntrin);
    return DAG.getUNDEF(VT);
  }

  auto RegID = IntrinsicID == Intrinsic::amdgcn_dispatch_ptr ?
    AMDGPUFunctionArgInfo::DISPATCH_PTR : AMDGPUFunctionArgInfo::QUEUE_PTR;
  return getPreloadedValue(DAG, *MFI, VT, RegID);
}
case Intrinsic::amdgcn_implicitarg_ptr: {
  if (MFI->isEntryFunction())
    return getImplicitArgPtr(DAG, DL);
  return getPreloadedValue(DAG, *MFI, VT,
                           AMDGPUFunctionArgInfo::IMPLICIT_ARG_PTR);
}
case Intrinsic::amdgcn_kernarg_segment_ptr: {
  if (!AMDGPU::isKernel(MF.getFunction().getCallingConv())) {
    // This only makes sense to call in a kernel, so just lower to null.
    return DAG.getConstant(0, DL, VT);
  }

  return getPreloadedValue(DAG, *MFI, VT,
                           AMDGPUFunctionArgInfo::KERNARG_SEGMENT_PTR);
}
case Intrinsic::amdgcn_dispatch_id: {
  return getPreloadedValue(DAG, *MFI, VT, AMDGPUFunctionArgInfo::DISPATCH_ID);
}
case Intrinsic::amdgcn_rcp:
  return DAG.getNode(AMDGPUISD::RCP, DL, VT, Op.getOperand(1));
case Intrinsic::amdgcn_rsq:
  return DAG.getNode(AMDGPUISD::RSQ, DL, VT, Op.getOperand(1));
case Intrinsic::amdgcn_rsq_legacy:
  if (Subtarget->getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
    return emitRemovedIntrinsicError(DAG, DL, VT);
  return SDValue();
case Intrinsic::amdgcn_rcp_legacy:
  if (Subtarget->getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
    return emitRemovedIntrinsicError(DAG, DL, VT);
  return DAG.getNode(AMDGPUISD::RCP_LEGACY, DL, VT, Op.getOperand(1));
case Intrinsic::amdgcn_rsq_clamp: {
  if (Subtarget->getGeneration() < AMDGPUSubtarget::VOLCANIC_ISLANDS)
    return DAG.getNode(AMDGPUISD::RSQ_CLAMP, DL, VT, Op.getOperand(1));

  Type *Type = VT.getTypeForEVT(*DAG.getContext());
  APFloat Max = APFloat::getLargest(Type->getFltSemantics());
  APFloat Min = APFloat::getLargest(Type->getFltSemantics(), true);

  SDValue Rsq = DAG.getNode(AMDGPUISD::RSQ, DL, VT, Op.getOperand(1));
  SDValue Tmp = DAG.getNode(ISD::FMINNUM, DL, VT, Rsq,
                            DAG.getConstantFP(Max, DL, VT));
  return DAG.getNode(ISD::FMAXNUM, DL, VT, Tmp,
                     DAG.getConstantFP(Min, DL, VT));
}
case Intrinsic::r600_read_ngroups_x:
  if (Subtarget->isAmdHsaOS())
    return emitNonHSAIntrinsicError(DAG, DL, VT);

  return lowerKernargMemParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
                                  SI::KernelInputOffsets::NGROUPS_X, Align(4),
                                  false);
case Intrinsic::r600_read_ngroups_y:
  if (Subtarget->isAmdHsaOS())
    return emitNonHSAIntrinsicError(DAG, DL, VT);

  return lowerKernargMemParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
                                  SI::KernelInputOffsets::NGROUPS_Y, Align(4),
                                  false);
case Intrinsic::r600_read_ngroups_z:
  if (Subtarget->isAmdHsaOS())
    return emitNonHSAIntrinsicError(DAG, DL, VT);

  return lowerKernargMemParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
                                  SI::KernelInputOffsets::NGROUPS_Z, Align(4),
                                  false);
case Intrinsic::r600_read_global_size_x:
  if (Subtarget->isAmdHsaOS())
    return emitNonHSAIntrinsicError(DAG, DL, VT);

  return lowerKernargMemParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
                                  SI::KernelInputOffsets::GLOBAL_SIZE_X,
                                  Align(4), false);
case Intrinsic::r600_read_global_size_y:
  if (Subtarget->isAmdHsaOS())
    return emitNonHSAIntrinsicError(DAG, DL, VT);

  return lowerKernargMemParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
                                  SI::KernelInputOffsets::GLOBAL_SIZE_Y,
                                  Align(4), false);
case Intrinsic::r600_read_global_size_z:
  if (Subtarget->isAmdHsaOS())
    return emitNonHSAIntrinsicError(DAG, DL, VT);

  return lowerKernargMemParameter(DAG, VT, VT, DL, DAG.getEntryNode(),
                                  SI::KernelInputOffsets::GLOBAL_SIZE_Z,
                                  Align(4), false);
case Intrinsic::r600_read_local_size_x:
  if (Subtarget->isAmdHsaOS())
    return emitNonHSAIntrinsicError(DAG, DL, VT);

  return lowerImplicitZextParam(DAG, Op, MVT::i16,
                                SI::KernelInputOffsets::LOCAL_SIZE_X);
case Intrinsic::r600_read_local_size_y:
  if (Subtarget->isAmdHsaOS())
    return emitNonHSAIntrinsicError(DAG, DL, VT);

  return lowerImplicitZextParam(DAG, Op, MVT::i16,
                                SI::KernelInputOffsets::LOCAL_SIZE_Y);
case Intrinsic::r600_read_local_size_z:
  if (Subtarget->isAmdHsaOS())
    return emitNonHSAIntrinsicError(DAG, DL, VT);

  return lowerImplicitZextParam(DAG, Op, MVT::i16,
                                SI::KernelInputOffsets::LOCAL_SIZE_Z);
case Intrinsic::amdgcn_workgroup_id_x:
  return getPreloadedValue(DAG, *MFI, VT,
                           AMDGPUFunctionArgInfo::WORKGROUP_ID_X);
case Intrinsic::amdgcn_workgroup_id_y:
  return getPreloadedValue(DAG, *MFI, VT,
                           AMDGPUFunctionArgInfo::WORKGROUP_ID_Y);
case Intrinsic::amdgcn_workgroup_id_z:
  return getPreloadedValue(DAG, *MFI, VT,
                           AMDGPUFunctionArgInfo::WORKGROUP_ID_Z);
case Intrinsic::amdgcn_workitem_id_x:
  return loadInputValue(DAG, &AMDGPU::VGPR_32RegClass, MVT::i32,
                        SDLoc(DAG.getEntryNode()),
                        MFI->getArgInfo().WorkItemIDX);
case Intrinsic::amdgcn_workitem_id_y:
  return loadInputValue(DAG, &AMDGPU::VGPR_32RegClass, MVT::i32,
                        SDLoc(DAG.getEntryNode()),
                        MFI->getArgInfo().WorkItemIDY);
case Intrinsic::amdgcn_workitem_id_z:
  return loadInputValue(DAG, &AMDGPU::VGPR_32RegClass, MVT::i32,
                        SDLoc(DAG.getEntryNode()),
                        MFI->getArgInfo().WorkItemIDZ);
case Intrinsic::amdgcn_wavefrontsize:
  return DAG.getConstant(MF.getSubtarget<GCNSubtarget>().getWavefrontSize(),
                         SDLoc(Op), MVT::i32);
case Intrinsic::amdgcn_s_buffer_load: {
  unsigned CPol = cast<ConstantSDNode>(Op.getOperand(3))->getZExtValue();
  if (CPol & ~AMDGPU::CPol::ALL)
    return Op;
  return lowerSBuffer(VT, DL, Op.getOperand(1), Op.getOperand(2), Op.getOperand(3),
                      DAG);
}
case Intrinsic::amdgcn_fdiv_fast:
  return lowerFDIV_FAST(Op, DAG);
case Intrinsic::amdgcn_sin:
  return DAG.getNode(AMDGPUISD::SIN_HW, DL, VT, Op.getOperand(1));

case Intrinsic::amdgcn_cos:
  return DAG.getNode(AMDGPUISD::COS_HW, DL, VT, Op.getOperand(1));

case Intrinsic::amdgcn_mul_u24:
  return DAG.getNode(AMDGPUISD::MUL_U24, DL, VT, Op.getOperand(1), Op.getOperand(2));
case Intrinsic::amdgcn_mul_i24:
  return DAG.getNode(AMDGPUISD::MUL_I24, DL, VT, Op.getOperand(1), Op.getOperand(2));

case Intrinsic::amdgcn_log_clamp: {
  if (Subtarget->getGeneration() < AMDGPUSubtarget::VOLCANIC_ISLANDS)
    return SDValue();

  return emitRemovedIntrinsicError(DAG, DL, VT);
}
case Intrinsic::amdgcn_ldexp:
  return DAG.getNode(AMDGPUISD::LDEXP, DL, VT,
                     Op.getOperand(1), Op.getOperand(2));

case Intrinsic::amdgcn_fract:
  return DAG.getNode(AMDGPUISD::FRACT, DL, VT, Op.getOperand(1));

case Intrinsic::amdgcn_class:
  return DAG.getNode(AMDGPUISD::FP_CLASS, DL, VT,
                     Op.getOperand(1), Op.getOperand(2));
case Intrinsic::amdgcn_div_fmas:
  return DAG.getNode(AMDGPUISD::DIV_FMAS, DL, VT,
                     Op.getOperand(1), Op.getOperand(2), Op.getOperand(3),
                     Op.getOperand(4));

case Intrinsic::amdgcn_div_fixup:
  return DAG.getNode(AMDGPUISD::DIV_FIXUP, DL, VT,
                     Op.getOperand(1), Op.getOperand(2), Op.getOperand(3));

case Intrinsic::amdgcn_div_scale: {
  const ConstantSDNode *Param = cast<ConstantSDNode>(Op.getOperand(3));

  // Translate to the operands expected by the machine instruction. The
  // first parameter must be the same as the first instruction.
  SDValue Numerator = Op.getOperand(1);
  SDValue Denominator = Op.getOperand(2);

  // Note this order is opposite of the machine instruction's operations,
  // which is s0.f = Quotient, s1.f = Denominator, s2.f = Numerator. The
  // intrinsic has the numerator as the first operand to match a normal
  // division operation.

  SDValue Src0 = Param->isAllOnesValue() ? Numerator : Denominator;

  return DAG.getNode(AMDGPUISD::DIV_SCALE, DL, Op->getVTList(), Src0,
                     Denominator, Numerator);
}
case Intrinsic::amdgcn_icmp: {
  // There is a Pat that handles this variant, so return it as-is.
  if (Op.getOperand(1).getValueType() == MVT::i1 &&
      Op.getConstantOperandVal(2) == 0 &&
      Op.getConstantOperandVal(3) == ICmpInst::Predicate::ICMP_NE)
    return Op;
  return lowerICMPIntrinsic(*this, Op.getNode(), DAG);
}
case Intrinsic::amdgcn_fcmp: {
  return lowerFCMPIntrinsic(*this, Op.getNode(), DAG);
}
case Intrinsic::amdgcn_ballot:
  return lowerBALLOTIntrinsic(*this, Op.getNode(), DAG);
case Intrinsic::amdgcn_fmed3:
  return DAG.getNode(AMDGPUISD::FMED3, DL, VT,
                     Op.getOperand(1), Op.getOperand(2), Op.getOperand(3));
case Intrinsic::amdgcn_fdot2:
  return DAG.getNode(AMDGPUISD::FDOT2, DL, VT,
                     Op.getOperand(1), Op.getOperand(2), Op.getOperand(3),
                     Op.getOperand(4));
case Intrinsic::amdgcn_fmul_legacy:
  return DAG.getNode(AMDGPUISD::FMUL_LEGACY, DL, VT,
                     Op.getOperand(1), Op.getOperand(2));
case Intrinsic::amdgcn_sffbh:
  return DAG.getNode(AMDGPUISD::FFBH_I32, DL, VT, Op.getOperand(1));
case Intrinsic::amdgcn_sbfe:
  return DAG.getNode(AMDGPUISD::BFE_I32, DL, VT,
                     Op.getOperand(1), Op.getOperand(2), Op.getOperand(3));
case Intrinsic::amdgcn_ubfe:
  return DAG.getNode(AMDGPUISD::BFE_U32, DL, VT,
                     Op.getOperand(1), Op.getOperand(2), Op.getOperand(3));
case Intrinsic::amdgcn_cvt_pkrtz:
case Intrinsic::amdgcn_cvt_pknorm_i16:
case Intrinsic::amdgcn_cvt_pknorm_u16:
case Intrinsic::amdgcn_cvt_pk_i16:
case Intrinsic::amdgcn_cvt_pk_u16: {
  // FIXME: Stop adding cast if v2f16/v2i16 are legal.
  EVT VT = Op.getValueType();
  unsigned Opcode;

  if (IntrinsicID == Intrinsic::amdgcn_cvt_pkrtz)
    Opcode = AMDGPUISD::CVT_PKRTZ_F16_F32;
  else if (IntrinsicID == Intrinsic::amdgcn_cvt_pknorm_i16)
    Opcode = AMDGPUISD::CVT_PKNORM_I16_F32;
  else if (IntrinsicID == Intrinsic::amdgcn_cvt_pknorm_u16)
    Opcode = AMDGPUISD::CVT_PKNORM_U16_F32;
  else if (IntrinsicID == Intrinsic::amdgcn_cvt_pk_i16)
    Opcode = AMDGPUISD::CVT_PK_I16_I32;
  else
    Opcode = AMDGPUISD::CVT_PK_U16_U32;

  if (isTypeLegal(VT))
    return DAG.getNode(Opcode, DL, VT, Op.getOperand(1), Op.getOperand(2));

  SDValue Node = DAG.getNode(Opcode, DL, MVT::i32,
                             Op.getOperand(1), Op.getOperand(2));
  return DAG.getNode(ISD::BITCAST, DL, VT, Node);
}
case Intrinsic::amdgcn_fmad_ftz:
  return DAG.getNode(AMDGPUISD::FMAD_FTZ, DL, VT, Op.getOperand(1),
                     Op.getOperand(2), Op.getOperand(3));

case Intrinsic::amdgcn_if_break:
  return SDValue(DAG.getMachineNode(AMDGPU::SI_IF_BREAK, DL, VT,
                                    Op->getOperand(1), Op->getOperand(2)), 0);

case Intrinsic::amdgcn_groupstaticsize: {
  Triple::OSType OS = getTargetMachine().getTargetTriple().getOS();
  if (OS == Triple::AMDHSA || OS == Triple::AMDPAL)
    return Op;

  const Module *M = MF.getFunction().getParent();
  const GlobalValue *GV =
      M->getNamedValue(Intrinsic::getName(Intrinsic::amdgcn_groupstaticsize));
  SDValue GA = DAG.getTargetGlobalAddress(GV, DL, MVT::i32, 0,
                                          SIInstrInfo::MO_ABS32_LO);
  return {DAG.getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32, GA), 0};
}
case Intrinsic::amdgcn_is_shared:
case Intrinsic::amdgcn_is_private: {
  SDLoc SL(Op);
  unsigned AS = (IntrinsicID == Intrinsic::amdgcn_is_shared) ?
    AMDGPUAS::LOCAL_ADDRESS : AMDGPUAS::PRIVATE_ADDRESS;
  SDValue Aperture = getSegmentAperture(AS, SL, DAG);
  SDValue SrcVec = DAG.getNode(ISD::BITCAST, DL, MVT::v2i32,
                               Op.getOperand(1));

  SDValue SrcHi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, SrcVec,
                              DAG.getConstant(1, SL, MVT::i32));
  return DAG.getSetCC(SL, MVT::i1, SrcHi, Aperture, ISD::SETEQ);
}
case Intrinsic::amdgcn_alignbit:
  return DAG.getNode(ISD::FSHR, DL, VT,
                     Op.getOperand(1), Op.getOperand(2), Op.getOperand(3));
case Intrinsic::amdgcn_perm:
  return DAG.getNode(AMDGPUISD::PERM, DL, MVT::i32, Op.getOperand(1),
                     Op.getOperand(2), Op.getOperand(3));
case Intrinsic::amdgcn_reloc_constant: {
  Module *M = const_cast<Module *>(MF.getFunction().getParent());
  const MDNode *Metadata = cast<MDNodeSDNode>(Op.getOperand(1))->getMD();
  auto SymbolName = cast<MDString>(Metadata->getOperand(0))->getString();
  auto RelocSymbol = cast<GlobalVariable>(
      M->getOrInsertGlobal(SymbolName, Type::getInt32Ty(M->getContext())));
  SDValue GA = DAG.getTargetGlobalAddress(RelocSymbol, DL, MVT::i32, 0,
                                          SIInstrInfo::MO_ABS32_LO);
  return {DAG.getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32, GA), 0};
}
default:
  if (const AMDGPU::ImageDimIntrinsicInfo *ImageDimIntr =
          AMDGPU::getImageDimIntrinsicInfo(IntrinsicID))
    return lowerImage(Op, ImageDimIntr, DAG, false);

  return Op;
}
6781}

6783/// Update \p MMO based on the offset inputs to an intrinsic.
6784static void updateBufferMMO(MachineMemOperand *MMO, SDValue VOffset,
                          SDValue SOffset, SDValue Offset,
                          SDValue VIndex = SDValue()) {
if (!isa<ConstantSDNode>(VOffset) || !isa<ConstantSDNode>(SOffset) ||
    !isa<ConstantSDNode>(Offset)) {
  // The combined offset is not known to be constant, so we cannot represent
  // it in the MMO. Give up.
  MMO->setValue((Value *)nullptr);
  return;
}

if (VIndex && (!isa<ConstantSDNode>(VIndex) ||
               !cast<ConstantSDNode>(VIndex)->isNullValue())) {
  // The strided index component of the address is not known to be zero, so we
  // cannot represent it in the MMO. Give up.
  MMO->setValue((Value *)nullptr);
  return;
}

MMO->setOffset(cast<ConstantSDNode>(VOffset)->getSExtValue() +
               cast<ConstantSDNode>(SOffset)->getSExtValue() +
               cast<ConstantSDNode>(Offset)->getSExtValue());
6806}

6808SDValue SITargetLowering::lowerRawBufferAtomicIntrin(SDValue Op,
                                                   SelectionDAG &DAG,
                                                   unsigned NewOpcode) const {
SDLoc DL(Op);

SDValue VData = Op.getOperand(2);
auto Offsets = splitBufferOffsets(Op.getOperand(4), DAG);
SDValue Ops[] = {
  Op.getOperand(0), // Chain
  VData,            // vdata
  Op.getOperand(3), // rsrc
  DAG.getConstant(0, DL, MVT::i32), // vindex
  Offsets.first,    // voffset
  Op.getOperand(5), // soffset
  Offsets.second,   // offset
  Op.getOperand(6), // cachepolicy
  DAG.getTargetConstant(0, DL, MVT::i1), // idxen
};

auto *M = cast<MemSDNode>(Op);
updateBufferMMO(M->getMemOperand(), Ops[4], Ops[5], Ops[6]);

EVT MemVT = VData.getValueType();
return DAG.getMemIntrinsicNode(NewOpcode, DL, Op->getVTList(), Ops, MemVT,
                               M->getMemOperand());
6833}

6835// Return a value to use for the idxen operand by examining the vindex operand.
6836static unsigned getIdxEn(SDValue VIndex) {
if (auto VIndexC = dyn_cast<ConstantSDNode>(VIndex))
  // No need to set idxen if vindex is known to be zero.
  return VIndexC->getZExtValue() != 0;
return 1;
6841}

6843SDValue
6844SITargetLowering::lowerStructBufferAtomicIntrin(SDValue Op, SelectionDAG &DAG,
                                              unsigned NewOpcode) const {
SDLoc DL(Op);

SDValue VData = Op.getOperand(2);
auto Offsets = splitBufferOffsets(Op.getOperand(5), DAG);
SDValue Ops[] = {
  Op.getOperand(0), // Chain
  VData,            // vdata
  Op.getOperand(3), // rsrc
  Op.getOperand(4), // vindex
  Offsets.first,    // voffset
  Op.getOperand(6), // soffset
  Offsets.second,   // offset
  Op.getOperand(7), // cachepolicy
  DAG.getTargetConstant(1, DL, MVT::i1), // idxen
};

auto *M = cast<MemSDNode>(Op);
updateBufferMMO(M->getMemOperand(), Ops[4], Ops[5], Ops[6], Ops[3]);

EVT MemVT = VData.getValueType();
return DAG.getMemIntrinsicNode(NewOpcode, DL, Op->getVTList(), Ops, MemVT,
                               M->getMemOperand());
6868}

6870SDValue SITargetLowering::LowerINTRINSIC_W_CHAIN(SDValue Op,
                                               SelectionDAG &DAG) const {
unsigned IntrID = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
SDLoc DL(Op);

switch (IntrID) {
case Intrinsic::amdgcn_ds_ordered_add:
case Intrinsic::amdgcn_ds_ordered_swap: {
  MemSDNode *M = cast<MemSDNode>(Op);
  SDValue Chain = M->getOperand(0);
  SDValue M0 = M->getOperand(2);
  SDValue Value = M->getOperand(3);
  unsigned IndexOperand = M->getConstantOperandVal(7);
  unsigned WaveRelease = M->getConstantOperandVal(8);
  unsigned WaveDone = M->getConstantOperandVal(9);

  unsigned OrderedCountIndex = IndexOperand & 0x3f;
  IndexOperand &= ~0x3f;
  unsigned CountDw = 0;

  if (Subtarget->getGeneration() >= AMDGPUSubtarget::GFX10) {
    CountDw = (IndexOperand >> 24) & 0xf;
    IndexOperand &= ~(0xf << 24);

    if (CountDw < 1 || CountDw > 4) {
      report_fatal_error(
          "ds_ordered_count: dword count must be between 1 and 4");
    }
  }

  if (IndexOperand)
    report_fatal_error("ds_ordered_count: bad index operand");

  if (WaveDone && !WaveRelease)
    report_fatal_error("ds_ordered_count: wave_done requires wave_release");

  unsigned Instruction = IntrID == Intrinsic::amdgcn_ds_ordered_add ? 0 : 1;
  unsigned ShaderType =
      SIInstrInfo::getDSShaderTypeValue(DAG.getMachineFunction());
  unsigned Offset0 = OrderedCountIndex << 2;
  unsigned Offset1 = WaveRelease | (WaveDone << 1) | (ShaderType << 2) |
                     (Instruction << 4);

  if (Subtarget->getGeneration() >= AMDGPUSubtarget::GFX10)
    Offset1 |= (CountDw - 1) << 6;

  unsigned Offset = Offset0 | (Offset1 << 8);

  SDValue Ops[] = {
    Chain,
    Value,
    DAG.getTargetConstant(Offset, DL, MVT::i16),
    copyToM0(DAG, Chain, DL, M0).getValue(1), // Glue
  };
  return DAG.getMemIntrinsicNode(AMDGPUISD::DS_ORDERED_COUNT, DL,
                                 M->getVTList(), Ops, M->getMemoryVT(),
                                 M->getMemOperand());
}
case Intrinsic::amdgcn_ds_fadd: {
  MemSDNode *M = cast<MemSDNode>(Op);
  unsigned Opc;
  switch (IntrID) {
  case Intrinsic::amdgcn_ds_fadd:
    Opc = ISD::ATOMIC_LOAD_FADD;
    break;
  }

  return DAG.getAtomic(Opc, SDLoc(Op), M->getMemoryVT(),
                       M->getOperand(0), M->getOperand(2), M->getOperand(3),
                       M->getMemOperand());
}
case Intrinsic::amdgcn_atomic_inc:
case Intrinsic::amdgcn_atomic_dec:
case Intrinsic::amdgcn_ds_fmin:
case Intrinsic::amdgcn_ds_fmax: {
  MemSDNode *M = cast<MemSDNode>(Op);
  unsigned Opc;
  switch (IntrID) {
  case Intrinsic::amdgcn_atomic_inc:
    Opc = AMDGPUISD::ATOMIC_INC;
    break;
  case Intrinsic::amdgcn_atomic_dec:
    Opc = AMDGPUISD::ATOMIC_DEC;
    break;
  case Intrinsic::amdgcn_ds_fmin:
    Opc = AMDGPUISD::ATOMIC_LOAD_FMIN;
    break;
  case Intrinsic::amdgcn_ds_fmax:
    Opc = AMDGPUISD::ATOMIC_LOAD_FMAX;
    break;
  default:
    llvm_unreachable("Unknown intrinsic!")__builtin_unreachable();
  }
  SDValue Ops[] = {
    M->getOperand(0), // Chain
    M->getOperand(2), // Ptr
    M->getOperand(3)  // Value
  };

  return DAG.getMemIntrinsicNode(Opc, SDLoc(Op), M->getVTList(), Ops,
                                 M->getMemoryVT(), M->getMemOperand());
}
case Intrinsic::amdgcn_buffer_load:
case Intrinsic::amdgcn_buffer_load_format: {
  unsigned Glc = cast<ConstantSDNode>(Op.getOperand(5))->getZExtValue();
  unsigned Slc = cast<ConstantSDNode>(Op.getOperand(6))->getZExtValue();
  unsigned IdxEn = getIdxEn(Op.getOperand(3));
  SDValue Ops[] = {
    Op.getOperand(0), // Chain
    Op.getOperand(2), // rsrc
    Op.getOperand(3), // vindex
    SDValue(),        // voffset -- will be set by setBufferOffsets
    SDValue(),        // soffset -- will be set by setBufferOffsets
    SDValue(),        // offset -- will be set by setBufferOffsets
    DAG.getTargetConstant(Glc | (Slc << 1), DL, MVT::i32), // cachepolicy
    DAG.getTargetConstant(IdxEn, DL, MVT::i1), // idxen
  };
  setBufferOffsets(Op.getOperand(4), DAG, &Ops[3]);

  unsigned Opc = (IntrID == Intrinsic::amdgcn_buffer_load) ?
      AMDGPUISD::BUFFER_LOAD : AMDGPUISD::BUFFER_LOAD_FORMAT;

  EVT VT = Op.getValueType();
  EVT IntVT = VT.changeTypeToInteger();
  auto *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[3], Ops[4], Ops[5], Ops[2]);
  EVT LoadVT = Op.getValueType();

  if (LoadVT.getScalarType() == MVT::f16)
    return adjustLoadValueType(AMDGPUISD::BUFFER_LOAD_FORMAT_D16,
                               M, DAG, Ops);

  // Handle BUFFER_LOAD_BYTE/UBYTE/SHORT/USHORT overloaded intrinsics
  if (LoadVT.getScalarType() == MVT::i8 ||
      LoadVT.getScalarType() == MVT::i16)
    return handleByteShortBufferLoads(DAG, LoadVT, DL, Ops, M);

  return getMemIntrinsicNode(Opc, DL, Op->getVTList(), Ops, IntVT,
                             M->getMemOperand(), DAG);
}
case Intrinsic::amdgcn_raw_buffer_load:
case Intrinsic::amdgcn_raw_buffer_load_format: {
  const bool IsFormat = IntrID == Intrinsic::amdgcn_raw_buffer_load_format;

  auto Offsets = splitBufferOffsets(Op.getOperand(3), DAG);
  SDValue Ops[] = {
    Op.getOperand(0), // Chain
    Op.getOperand(2), // rsrc
    DAG.getConstant(0, DL, MVT::i32), // vindex
    Offsets.first,    // voffset
    Op.getOperand(4), // soffset
    Offsets.second,   // offset
    Op.getOperand(5), // cachepolicy, swizzled buffer
    DAG.getTargetConstant(0, DL, MVT::i1), // idxen
  };

  auto *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[3], Ops[4], Ops[5]);
  return lowerIntrinsicLoad(M, IsFormat, DAG, Ops);
}
case Intrinsic::amdgcn_struct_buffer_load:
case Intrinsic::amdgcn_struct_buffer_load_format: {
  const bool IsFormat = IntrID == Intrinsic::amdgcn_struct_buffer_load_format;

  auto Offsets = splitBufferOffsets(Op.getOperand(4), DAG);
  SDValue Ops[] = {
    Op.getOperand(0), // Chain
    Op.getOperand(2), // rsrc
    Op.getOperand(3), // vindex
    Offsets.first,    // voffset
    Op.getOperand(5), // soffset
    Offsets.second,   // offset
    Op.getOperand(6), // cachepolicy, swizzled buffer
    DAG.getTargetConstant(1, DL, MVT::i1), // idxen
  };

  auto *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[3], Ops[4], Ops[5], Ops[2]);
  return lowerIntrinsicLoad(cast<MemSDNode>(Op), IsFormat, DAG, Ops);
}
case Intrinsic::amdgcn_tbuffer_load: {
  MemSDNode *M = cast<MemSDNode>(Op);
  EVT LoadVT = Op.getValueType();

  unsigned Dfmt = cast<ConstantSDNode>(Op.getOperand(7))->getZExtValue();
  unsigned Nfmt = cast<ConstantSDNode>(Op.getOperand(8))->getZExtValue();
  unsigned Glc = cast<ConstantSDNode>(Op.getOperand(9))->getZExtValue();
  unsigned Slc = cast<ConstantSDNode>(Op.getOperand(10))->getZExtValue();
  unsigned IdxEn = getIdxEn(Op.getOperand(3));
  SDValue Ops[] = {
    Op.getOperand(0),  // Chain
    Op.getOperand(2),  // rsrc
    Op.getOperand(3),  // vindex
    Op.getOperand(4),  // voffset
    Op.getOperand(5),  // soffset
    Op.getOperand(6),  // offset
    DAG.getTargetConstant(Dfmt | (Nfmt << 4), DL, MVT::i32), // format
    DAG.getTargetConstant(Glc | (Slc << 1), DL, MVT::i32), // cachepolicy
    DAG.getTargetConstant(IdxEn, DL, MVT::i1) // idxen
  };

  if (LoadVT.getScalarType() == MVT::f16)
    return adjustLoadValueType(AMDGPUISD::TBUFFER_LOAD_FORMAT_D16,
                               M, DAG, Ops);
  return getMemIntrinsicNode(AMDGPUISD::TBUFFER_LOAD_FORMAT, DL,
                             Op->getVTList(), Ops, LoadVT, M->getMemOperand(),
                             DAG);
}
case Intrinsic::amdgcn_raw_tbuffer_load: {
  MemSDNode *M = cast<MemSDNode>(Op);
  EVT LoadVT = Op.getValueType();
  auto Offsets = splitBufferOffsets(Op.getOperand(3), DAG);

  SDValue Ops[] = {
    Op.getOperand(0),  // Chain
    Op.getOperand(2),  // rsrc
    DAG.getConstant(0, DL, MVT::i32), // vindex
    Offsets.first,     // voffset
    Op.getOperand(4),  // soffset
    Offsets.second,    // offset
    Op.getOperand(5),  // format
    Op.getOperand(6),  // cachepolicy, swizzled buffer
    DAG.getTargetConstant(0, DL, MVT::i1), // idxen
  };

  if (LoadVT.getScalarType() == MVT::f16)
    return adjustLoadValueType(AMDGPUISD::TBUFFER_LOAD_FORMAT_D16,
                               M, DAG, Ops);
  return getMemIntrinsicNode(AMDGPUISD::TBUFFER_LOAD_FORMAT, DL,
                             Op->getVTList(), Ops, LoadVT, M->getMemOperand(),
                             DAG);
}
case Intrinsic::amdgcn_struct_tbuffer_load: {
  MemSDNode *M = cast<MemSDNode>(Op);
  EVT LoadVT = Op.getValueType();
  auto Offsets = splitBufferOffsets(Op.getOperand(4), DAG);

  SDValue Ops[] = {
    Op.getOperand(0),  // Chain
    Op.getOperand(2),  // rsrc
    Op.getOperand(3),  // vindex
    Offsets.first,     // voffset
    Op.getOperand(5),  // soffset
    Offsets.second,    // offset
    Op.getOperand(6),  // format
    Op.getOperand(7),  // cachepolicy, swizzled buffer
    DAG.getTargetConstant(1, DL, MVT::i1), // idxen
  };

  if (LoadVT.getScalarType() == MVT::f16)
    return adjustLoadValueType(AMDGPUISD::TBUFFER_LOAD_FORMAT_D16,
                               M, DAG, Ops);
  return getMemIntrinsicNode(AMDGPUISD::TBUFFER_LOAD_FORMAT, DL,
                             Op->getVTList(), Ops, LoadVT, M->getMemOperand(),
                             DAG);
}
case Intrinsic::amdgcn_buffer_atomic_swap:
case Intrinsic::amdgcn_buffer_atomic_add:
case Intrinsic::amdgcn_buffer_atomic_sub:
case Intrinsic::amdgcn_buffer_atomic_csub:
case Intrinsic::amdgcn_buffer_atomic_smin:
case Intrinsic::amdgcn_buffer_atomic_umin:
case Intrinsic::amdgcn_buffer_atomic_smax:
case Intrinsic::amdgcn_buffer_atomic_umax:
case Intrinsic::amdgcn_buffer_atomic_and:
case Intrinsic::amdgcn_buffer_atomic_or:
case Intrinsic::amdgcn_buffer_atomic_xor:
case Intrinsic::amdgcn_buffer_atomic_fadd: {
  unsigned Slc = cast<ConstantSDNode>(Op.getOperand(6))->getZExtValue();
  unsigned IdxEn = getIdxEn(Op.getOperand(4));
  SDValue Ops[] = {
    Op.getOperand(0), // Chain
    Op.getOperand(2), // vdata
    Op.getOperand(3), // rsrc
    Op.getOperand(4), // vindex
    SDValue(),        // voffset -- will be set by setBufferOffsets
    SDValue(),        // soffset -- will be set by setBufferOffsets
    SDValue(),        // offset -- will be set by setBufferOffsets
    DAG.getTargetConstant(Slc << 1, DL, MVT::i32), // cachepolicy
    DAG.getTargetConstant(IdxEn, DL, MVT::i1), // idxen
  };
  setBufferOffsets(Op.getOperand(5), DAG, &Ops[4]);

  EVT VT = Op.getValueType();

  auto *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[4], Ops[5], Ops[6], Ops[3]);
  unsigned Opcode = 0;

  switch (IntrID) {
  case Intrinsic::amdgcn_buffer_atomic_swap:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_SWAP;
    break;
  case Intrinsic::amdgcn_buffer_atomic_add:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_ADD;
    break;
  case Intrinsic::amdgcn_buffer_atomic_sub:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_SUB;
    break;
  case Intrinsic::amdgcn_buffer_atomic_csub:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_CSUB;
    break;
  case Intrinsic::amdgcn_buffer_atomic_smin:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_SMIN;
    break;
  case Intrinsic::amdgcn_buffer_atomic_umin:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_UMIN;
    break;
  case Intrinsic::amdgcn_buffer_atomic_smax:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_SMAX;
    break;
  case Intrinsic::amdgcn_buffer_atomic_umax:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_UMAX;
    break;
  case Intrinsic::amdgcn_buffer_atomic_and:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_AND;
    break;
  case Intrinsic::amdgcn_buffer_atomic_or:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_OR;
    break;
  case Intrinsic::amdgcn_buffer_atomic_xor:
    Opcode = AMDGPUISD::BUFFER_ATOMIC_XOR;
    break;
  case Intrinsic::amdgcn_buffer_atomic_fadd:
    if (!Op.getValue(0).use_empty() && !Subtarget->hasGFX90AInsts()) {
      DiagnosticInfoUnsupported
        NoFpRet(DAG.getMachineFunction().getFunction(),
                "return versions of fp atomics not supported",
                DL.getDebugLoc(), DS_Error);
      DAG.getContext()->diagnose(NoFpRet);
      return SDValue();
    }
    Opcode = AMDGPUISD::BUFFER_ATOMIC_FADD;
    break;
  default:
    llvm_unreachable("unhandled atomic opcode")__builtin_unreachable();
  }

  return DAG.getMemIntrinsicNode(Opcode, DL, Op->getVTList(), Ops, VT,
                                 M->getMemOperand());
}
case Intrinsic::amdgcn_raw_buffer_atomic_fadd:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_FADD);
case Intrinsic::amdgcn_struct_buffer_atomic_fadd:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_FADD);
case Intrinsic::amdgcn_raw_buffer_atomic_fmin:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_FMIN);
case Intrinsic::amdgcn_struct_buffer_atomic_fmin:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_FMIN);
case Intrinsic::amdgcn_raw_buffer_atomic_fmax:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_FMAX);
case Intrinsic::amdgcn_struct_buffer_atomic_fmax:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_FMAX);
case Intrinsic::amdgcn_raw_buffer_atomic_swap:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_SWAP);
case Intrinsic::amdgcn_raw_buffer_atomic_add:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_ADD);
case Intrinsic::amdgcn_raw_buffer_atomic_sub:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_SUB);
case Intrinsic::amdgcn_raw_buffer_atomic_smin:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_SMIN);
case Intrinsic::amdgcn_raw_buffer_atomic_umin:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_UMIN);
case Intrinsic::amdgcn_raw_buffer_atomic_smax:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_SMAX);
case Intrinsic::amdgcn_raw_buffer_atomic_umax:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_UMAX);
case Intrinsic::amdgcn_raw_buffer_atomic_and:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_AND);
case Intrinsic::amdgcn_raw_buffer_atomic_or:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_OR);
case Intrinsic::amdgcn_raw_buffer_atomic_xor:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_XOR);
case Intrinsic::amdgcn_raw_buffer_atomic_inc:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_INC);
case Intrinsic::amdgcn_raw_buffer_atomic_dec:
  return lowerRawBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_DEC);
case Intrinsic::amdgcn_struct_buffer_atomic_swap:
  return lowerStructBufferAtomicIntrin(Op, DAG,
                                       AMDGPUISD::BUFFER_ATOMIC_SWAP);
case Intrinsic::amdgcn_struct_buffer_atomic_add:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_ADD);
case Intrinsic::amdgcn_struct_buffer_atomic_sub:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_SUB);
case Intrinsic::amdgcn_struct_buffer_atomic_smin:
  return lowerStructBufferAtomicIntrin(Op, DAG,
                                       AMDGPUISD::BUFFER_ATOMIC_SMIN);
case Intrinsic::amdgcn_struct_buffer_atomic_umin:
  return lowerStructBufferAtomicIntrin(Op, DAG,
                                       AMDGPUISD::BUFFER_ATOMIC_UMIN);
case Intrinsic::amdgcn_struct_buffer_atomic_smax:
  return lowerStructBufferAtomicIntrin(Op, DAG,
                                       AMDGPUISD::BUFFER_ATOMIC_SMAX);
case Intrinsic::amdgcn_struct_buffer_atomic_umax:
  return lowerStructBufferAtomicIntrin(Op, DAG,
                                       AMDGPUISD::BUFFER_ATOMIC_UMAX);
case Intrinsic::amdgcn_struct_buffer_atomic_and:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_AND);
case Intrinsic::amdgcn_struct_buffer_atomic_or:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_OR);
case Intrinsic::amdgcn_struct_buffer_atomic_xor:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_XOR);
case Intrinsic::amdgcn_struct_buffer_atomic_inc:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_INC);
case Intrinsic::amdgcn_struct_buffer_atomic_dec:
  return lowerStructBufferAtomicIntrin(Op, DAG, AMDGPUISD::BUFFER_ATOMIC_DEC);

case Intrinsic::amdgcn_buffer_atomic_cmpswap: {
  unsigned Slc = cast<ConstantSDNode>(Op.getOperand(7))->getZExtValue();
  unsigned IdxEn = getIdxEn(Op.getOperand(5));
  SDValue Ops[] = {
    Op.getOperand(0), // Chain
    Op.getOperand(2), // src
    Op.getOperand(3), // cmp
    Op.getOperand(4), // rsrc
    Op.getOperand(5), // vindex
    SDValue(),        // voffset -- will be set by setBufferOffsets
    SDValue(),        // soffset -- will be set by setBufferOffsets
    SDValue(),        // offset -- will be set by setBufferOffsets
    DAG.getTargetConstant(Slc << 1, DL, MVT::i32), // cachepolicy
    DAG.getTargetConstant(IdxEn, DL, MVT::i1), // idxen
  };
  setBufferOffsets(Op.getOperand(6), DAG, &Ops[5]);

  EVT VT = Op.getValueType();
  auto *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[5], Ops[6], Ops[7], Ops[4]);

  return DAG.getMemIntrinsicNode(AMDGPUISD::BUFFER_ATOMIC_CMPSWAP, DL,
                                 Op->getVTList(), Ops, VT, M->getMemOperand());
}
case Intrinsic::amdgcn_raw_buffer_atomic_cmpswap: {
  auto Offsets = splitBufferOffsets(Op.getOperand(5), DAG);
  SDValue Ops[] = {
    Op.getOperand(0), // Chain
    Op.getOperand(2), // src
    Op.getOperand(3), // cmp
    Op.getOperand(4), // rsrc
    DAG.getConstant(0, DL, MVT::i32), // vindex
    Offsets.first,    // voffset
    Op.getOperand(6), // soffset
    Offsets.second,   // offset
    Op.getOperand(7), // cachepolicy
    DAG.getTargetConstant(0, DL, MVT::i1), // idxen
  };
  EVT VT = Op.getValueType();
  auto *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[5], Ops[6], Ops[7]);

  return DAG.getMemIntrinsicNode(AMDGPUISD::BUFFER_ATOMIC_CMPSWAP, DL,
                                 Op->getVTList(), Ops, VT, M->getMemOperand());
}
case Intrinsic::amdgcn_struct_buffer_atomic_cmpswap: {
  auto Offsets = splitBufferOffsets(Op.getOperand(6), DAG);
  SDValue Ops[] = {
    Op.getOperand(0), // Chain
    Op.getOperand(2), // src
    Op.getOperand(3), // cmp
    Op.getOperand(4), // rsrc
    Op.getOperand(5), // vindex
    Offsets.first,    // voffset
    Op.getOperand(7), // soffset
    Offsets.second,   // offset
    Op.getOperand(8), // cachepolicy
    DAG.getTargetConstant(1, DL, MVT::i1), // idxen
  };
  EVT VT = Op.getValueType();
  auto *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[5], Ops[6], Ops[7], Ops[4]);

  return DAG.getMemIntrinsicNode(AMDGPUISD::BUFFER_ATOMIC_CMPSWAP, DL,
                                 Op->getVTList(), Ops, VT, M->getMemOperand());
}
case Intrinsic::amdgcn_image_bvh_intersect_ray: {
  SDLoc DL(Op);
  MemSDNode *M = cast<MemSDNode>(Op);
  SDValue NodePtr = M->getOperand(2);
  SDValue RayExtent = M->getOperand(3);
  SDValue RayOrigin = M->getOperand(4);
  SDValue RayDir = M->getOperand(5);
  SDValue RayInvDir = M->getOperand(6);
  SDValue TDescr = M->getOperand(7);

  assert(NodePtr.getValueType() == MVT::i32 ||((void)0)
         NodePtr.getValueType() == MVT::i64)((void)0);
  assert(RayDir.getValueType() == MVT::v4f16 ||((void)0)
         RayDir.getValueType() == MVT::v4f32)((void)0);

  if (!Subtarget->hasGFX10_AEncoding()) {
    emitRemovedIntrinsicError(DAG, DL, Op.getValueType());
    return SDValue();
  }

  bool IsA16 = RayDir.getValueType().getVectorElementType() == MVT::f16;
  bool Is64 = NodePtr.getValueType() == MVT::i64;
  unsigned Opcode = IsA16 ? Is64 ? AMDGPU::IMAGE_BVH64_INTERSECT_RAY_a16_nsa
                                 : AMDGPU::IMAGE_BVH_INTERSECT_RAY_a16_nsa
                          : Is64 ? AMDGPU::IMAGE_BVH64_INTERSECT_RAY_nsa
                                 : AMDGPU::IMAGE_BVH_INTERSECT_RAY_nsa;

  SmallVector<SDValue, 16> Ops;

  auto packLanes = [&DAG, &Ops, &DL] (SDValue Op, bool IsAligned) {
    SmallVector<SDValue, 3> Lanes;
    DAG.ExtractVectorElements(Op, Lanes, 0, 3);
    if (Lanes[0].getValueSizeInBits() == 32) {
      for (unsigned I = 0; I < 3; ++I)
        Ops.push_back(DAG.getBitcast(MVT::i32, Lanes[I]));
    } else {
      if (IsAligned) {
        Ops.push_back(
          DAG.getBitcast(MVT::i32,
                         DAG.getBuildVector(MVT::v2f16, DL,
                                            { Lanes[0], Lanes[1] })));
        Ops.push_back(Lanes[2]);
      } else {
        SDValue Elt0 = Ops.pop_back_val();
        Ops.push_back(
          DAG.getBitcast(MVT::i32,
                         DAG.getBuildVector(MVT::v2f16, DL,
                                            { Elt0, Lanes[0] })));
        Ops.push_back(
          DAG.getBitcast(MVT::i32,
                         DAG.getBuildVector(MVT::v2f16, DL,
                                            { Lanes[1], Lanes[2] })));
      }
    }
  };

  if (Is64)
    DAG.ExtractVectorElements(DAG.getBitcast(MVT::v2i32, NodePtr), Ops, 0, 2);
  else
    Ops.push_back(NodePtr);

  Ops.push_back(DAG.getBitcast(MVT::i32, RayExtent));
  packLanes(RayOrigin, true);
  packLanes(RayDir, true);
  packLanes(RayInvDir, false);
  Ops.push_back(TDescr);
  if (IsA16)
    Ops.push_back(DAG.getTargetConstant(1, DL, MVT::i1));
  Ops.push_back(M->getChain());

  auto *NewNode = DAG.getMachineNode(Opcode, DL, M->getVTList(), Ops);
  MachineMemOperand *MemRef = M->getMemOperand();
  DAG.setNodeMemRefs(NewNode, {MemRef});
  return SDValue(NewNode, 0);
}
case Intrinsic::amdgcn_global_atomic_fadd:
  if (!Op.getValue(0).use_empty() && !Subtarget->hasGFX90AInsts()) {
    DiagnosticInfoUnsupported
      NoFpRet(DAG.getMachineFunction().getFunction(),
              "return versions of fp atomics not supported",
              DL.getDebugLoc(), DS_Error);
    DAG.getContext()->diagnose(NoFpRet);
    return SDValue();
  }
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
case Intrinsic::amdgcn_global_atomic_fmin:
case Intrinsic::amdgcn_global_atomic_fmax:
case Intrinsic::amdgcn_flat_atomic_fadd:
case Intrinsic::amdgcn_flat_atomic_fmin:
case Intrinsic::amdgcn_flat_atomic_fmax: {
  MemSDNode *M = cast<MemSDNode>(Op);
  SDValue Ops[] = {
    M->getOperand(0), // Chain
    M->getOperand(2), // Ptr
    M->getOperand(3)  // Value
  };
  unsigned Opcode = 0;
  switch (IntrID) {
  case Intrinsic::amdgcn_global_atomic_fadd:
  case Intrinsic::amdgcn_flat_atomic_fadd: {
    EVT VT = Op.getOperand(3).getValueType();
    return DAG.getAtomic(ISD::ATOMIC_LOAD_FADD, DL, VT,
                         DAG.getVTList(VT, MVT::Other), Ops,
                         M->getMemOperand());
  }
  case Intrinsic::amdgcn_global_atomic_fmin:
  case Intrinsic::amdgcn_flat_atomic_fmin: {
    Opcode = AMDGPUISD::ATOMIC_LOAD_FMIN;
    break;
  }
  case Intrinsic::amdgcn_global_atomic_fmax:
  case Intrinsic::amdgcn_flat_atomic_fmax: {
    Opcode = AMDGPUISD::ATOMIC_LOAD_FMAX;
    break;
  }
  default:
    llvm_unreachable("unhandled atomic opcode")__builtin_unreachable();
  }
  return DAG.getMemIntrinsicNode(Opcode, SDLoc(Op),
                                 M->getVTList(), Ops, M->getMemoryVT(),
                                 M->getMemOperand());
}
default:

  if (const AMDGPU::ImageDimIntrinsicInfo *ImageDimIntr =
          AMDGPU::getImageDimIntrinsicInfo(IntrID))
    return lowerImage(Op, ImageDimIntr, DAG, true);

  return SDValue();
}
7473}

7475// Call DAG.getMemIntrinsicNode for a load, but first widen a dwordx3 type to
7476// dwordx4 if on SI.
7477SDValue SITargetLowering::getMemIntrinsicNode(unsigned Opcode, const SDLoc &DL,
                                            SDVTList VTList,
                                            ArrayRef<SDValue> Ops, EVT MemVT,
                                            MachineMemOperand *MMO,
                                            SelectionDAG &DAG) const {
EVT VT = VTList.VTs[0];
EVT WidenedVT = VT;
EVT WidenedMemVT = MemVT;
if (!Subtarget->hasDwordx3LoadStores() &&
    (WidenedVT == MVT::v3i32 || WidenedVT == MVT::v3f32)) {
  WidenedVT = EVT::getVectorVT(*DAG.getContext(),
                               WidenedVT.getVectorElementType(), 4);
  WidenedMemVT = EVT::getVectorVT(*DAG.getContext(),
                                  WidenedMemVT.getVectorElementType(), 4);
  MMO = DAG.getMachineFunction().getMachineMemOperand(MMO, 0, 16);
}

assert(VTList.NumVTs == 2)((void)0);
SDVTList WidenedVTList = DAG.getVTList(WidenedVT, VTList.VTs[1]);

auto NewOp = DAG.getMemIntrinsicNode(Opcode, DL, WidenedVTList, Ops,
                                     WidenedMemVT, MMO);
if (WidenedVT != VT) {
  auto Extract = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, NewOp,
                             DAG.getVectorIdxConstant(0, DL));
  NewOp = DAG.getMergeValues({ Extract, SDValue(NewOp.getNode(), 1) }, DL);
}
return NewOp;
7505}

7507SDValue SITargetLowering::handleD16VData(SDValue VData, SelectionDAG &DAG,
                                       bool ImageStore) const {
EVT StoreVT = VData.getValueType();

// No change for f16 and legal vector D16 types.
if (!StoreVT.isVector())
  return VData;

SDLoc DL(VData);
unsigned NumElements = StoreVT.getVectorNumElements();

if (Subtarget->hasUnpackedD16VMem()) {
  // We need to unpack the packed data to store.
  EVT IntStoreVT = StoreVT.changeTypeToInteger();
  SDValue IntVData = DAG.getNode(ISD::BITCAST, DL, IntStoreVT, VData);

  EVT EquivStoreVT =
      EVT::getVectorVT(*DAG.getContext(), MVT::i32, NumElements);
  SDValue ZExt = DAG.getNode(ISD::ZERO_EXTEND, DL, EquivStoreVT, IntVData);
  return DAG.UnrollVectorOp(ZExt.getNode());
}

// The sq block of gfx8.1 does not estimate register use correctly for d16
// image store instructions. The data operand is computed as if it were not a
// d16 image instruction.
if (ImageStore && Subtarget->hasImageStoreD16Bug()) {
  // Bitcast to i16
  EVT IntStoreVT = StoreVT.changeTypeToInteger();
  SDValue IntVData = DAG.getNode(ISD::BITCAST, DL, IntStoreVT, VData);

  // Decompose into scalars
  SmallVector<SDValue, 4> Elts;
  DAG.ExtractVectorElements(IntVData, Elts);

  // Group pairs of i16 into v2i16 and bitcast to i32
  SmallVector<SDValue, 4> PackedElts;
  for (unsigned I = 0; I < Elts.size() / 2; I += 1) {
    SDValue Pair =
        DAG.getBuildVector(MVT::v2i16, DL, {Elts[I * 2], Elts[I * 2 + 1]});
    SDValue IntPair = DAG.getNode(ISD::BITCAST, DL, MVT::i32, Pair);
    PackedElts.push_back(IntPair);
  }
  if ((NumElements % 2) == 1) {
    // Handle v3i16
    unsigned I = Elts.size() / 2;
    SDValue Pair = DAG.getBuildVector(MVT::v2i16, DL,
                                      {Elts[I * 2], DAG.getUNDEF(MVT::i16)});
    SDValue IntPair = DAG.getNode(ISD::BITCAST, DL, MVT::i32, Pair);
    PackedElts.push_back(IntPair);
  }

  // Pad using UNDEF
  PackedElts.resize(Elts.size(), DAG.getUNDEF(MVT::i32));

  // Build final vector
  EVT VecVT =
      EVT::getVectorVT(*DAG.getContext(), MVT::i32, PackedElts.size());
  return DAG.getBuildVector(VecVT, DL, PackedElts);
}

if (NumElements == 3) {
  EVT IntStoreVT =
      EVT::getIntegerVT(*DAG.getContext(), StoreVT.getStoreSizeInBits());
  SDValue IntVData = DAG.getNode(ISD::BITCAST, DL, IntStoreVT, VData);

  EVT WidenedStoreVT = EVT::getVectorVT(
      *DAG.getContext(), StoreVT.getVectorElementType(), NumElements + 1);
  EVT WidenedIntVT = EVT::getIntegerVT(*DAG.getContext(),
                                       WidenedStoreVT.getStoreSizeInBits());
  SDValue ZExt = DAG.getNode(ISD::ZERO_EXTEND, DL, WidenedIntVT, IntVData);
  return DAG.getNode(ISD::BITCAST, DL, WidenedStoreVT, ZExt);
}

assert(isTypeLegal(StoreVT))((void)0);
return VData;
7582}

7584SDValue SITargetLowering::LowerINTRINSIC_VOID(SDValue Op,
                                            SelectionDAG &DAG) const {
SDLoc DL(Op);
SDValue Chain = Op.getOperand(0);
unsigned IntrinsicID = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
MachineFunction &MF = DAG.getMachineFunction();

switch (IntrinsicID) {
case Intrinsic::amdgcn_exp_compr: {
  SDValue Src0 = Op.getOperand(4);
  SDValue Src1 = Op.getOperand(5);
  // Hack around illegal type on SI by directly selecting it.
  if (isTypeLegal(Src0.getValueType()))
    return SDValue();

  const ConstantSDNode *Done = cast<ConstantSDNode>(Op.getOperand(6));
  SDValue Undef = DAG.getUNDEF(MVT::f32);
  const SDValue Ops[] = {
    Op.getOperand(2), // tgt
    DAG.getNode(ISD::BITCAST, DL, MVT::f32, Src0), // src0
    DAG.getNode(ISD::BITCAST, DL, MVT::f32, Src1), // src1
    Undef, // src2
    Undef, // src3
    Op.getOperand(7), // vm
    DAG.getTargetConstant(1, DL, MVT::i1), // compr
    Op.getOperand(3), // en
    Op.getOperand(0) // Chain
  };

  unsigned Opc = Done->isNullValue() ? AMDGPU::EXP : AMDGPU::EXP_DONE;
  return SDValue(DAG.getMachineNode(Opc, DL, Op->getVTList(), Ops), 0);
}
case Intrinsic::amdgcn_s_barrier: {
  if (getTargetMachine().getOptLevel() > CodeGenOpt::None) {
    const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
    unsigned WGSize = ST.getFlatWorkGroupSizes(MF.getFunction()).second;
    if (WGSize <= ST.getWavefrontSize())
      return SDValue(DAG.getMachineNode(AMDGPU::WAVE_BARRIER, DL, MVT::Other,
                                        Op.getOperand(0)), 0);
  }
  return SDValue();
};
case Intrinsic::amdgcn_tbuffer_store: {
  SDValue VData = Op.getOperand(2);
  bool IsD16 = (VData.getValueType().getScalarType() == MVT::f16);
  if (IsD16)
    VData = handleD16VData(VData, DAG);
  unsigned Dfmt = cast<ConstantSDNode>(Op.getOperand(8))->getZExtValue();
  unsigned Nfmt = cast<ConstantSDNode>(Op.getOperand(9))->getZExtValue();
  unsigned Glc = cast<ConstantSDNode>(Op.getOperand(10))->getZExtValue();
  unsigned Slc = cast<ConstantSDNode>(Op.getOperand(11))->getZExtValue();
  unsigned IdxEn = getIdxEn(Op.getOperand(4));
  SDValue Ops[] = {
    Chain,
    VData,             // vdata
    Op.getOperand(3),  // rsrc
    Op.getOperand(4),  // vindex
    Op.getOperand(5),  // voffset
    Op.getOperand(6),  // soffset
    Op.getOperand(7),  // offset
    DAG.getTargetConstant(Dfmt | (Nfmt << 4), DL, MVT::i32), // format
    DAG.getTargetConstant(Glc | (Slc << 1), DL, MVT::i32), // cachepolicy
    DAG.getTargetConstant(IdxEn, DL, MVT::i1), // idxen
  };
  unsigned Opc = IsD16 ? AMDGPUISD::TBUFFER_STORE_FORMAT_D16 :
                         AMDGPUISD::TBUFFER_STORE_FORMAT;
  MemSDNode *M = cast<MemSDNode>(Op);
  return DAG.getMemIntrinsicNode(Opc, DL, Op->getVTList(), Ops,
                                 M->getMemoryVT(), M->getMemOperand());
}

case Intrinsic::amdgcn_struct_tbuffer_store: {
  SDValue VData = Op.getOperand(2);
  bool IsD16 = (VData.getValueType().getScalarType() == MVT::f16);
  if (IsD16)
    VData = handleD16VData(VData, DAG);
  auto Offsets = splitBufferOffsets(Op.getOperand(5), DAG);
  SDValue Ops[] = {
    Chain,
    VData,             // vdata
    Op.getOperand(3),  // rsrc
    Op.getOperand(4),  // vindex
    Offsets.first,     // voffset
    Op.getOperand(6),  // soffset
    Offsets.second,    // offset
    Op.getOperand(7),  // format
    Op.getOperand(8),  // cachepolicy, swizzled buffer
    DAG.getTargetConstant(1, DL, MVT::i1), // idxen
  };
  unsigned Opc = IsD16 ? AMDGPUISD::TBUFFER_STORE_FORMAT_D16 :
                         AMDGPUISD::TBUFFER_STORE_FORMAT;
  MemSDNode *M = cast<MemSDNode>(Op);
  return DAG.getMemIntrinsicNode(Opc, DL, Op->getVTList(), Ops,
                                 M->getMemoryVT(), M->getMemOperand());
}

case Intrinsic::amdgcn_raw_tbuffer_store: {
  SDValue VData = Op.getOperand(2);
  bool IsD16 = (VData.getValueType().getScalarType() == MVT::f16);
  if (IsD16)
    VData = handleD16VData(VData, DAG);
  auto Offsets = splitBufferOffsets(Op.getOperand(4), DAG);
  SDValue Ops[] = {
    Chain,
    VData,             // vdata
    Op.getOperand(3),  // rsrc
    DAG.getConstant(0, DL, MVT::i32), // vindex
    Offsets.first,     // voffset
    Op.getOperand(5),  // soffset
    Offsets.second,    // offset
    Op.getOperand(6),  // format
    Op.getOperand(7),  // cachepolicy, swizzled buffer
    DAG.getTargetConstant(0, DL, MVT::i1), // idxen
  };
  unsigned Opc = IsD16 ? AMDGPUISD::TBUFFER_STORE_FORMAT_D16 :
                         AMDGPUISD::TBUFFER_STORE_FORMAT;
  MemSDNode *M = cast<MemSDNode>(Op);
  return DAG.getMemIntrinsicNode(Opc, DL, Op->getVTList(), Ops,
                                 M->getMemoryVT(), M->getMemOperand());
}

case Intrinsic::amdgcn_buffer_store:
case Intrinsic::amdgcn_buffer_store_format: {
  SDValue VData = Op.getOperand(2);
  bool IsD16 = (VData.getValueType().getScalarType() == MVT::f16);
  if (IsD16)
    VData = handleD16VData(VData, DAG);
  unsigned Glc = cast<ConstantSDNode>(Op.getOperand(6))->getZExtValue();
  unsigned Slc = cast<ConstantSDNode>(Op.getOperand(7))->getZExtValue();
  unsigned IdxEn = getIdxEn(Op.getOperand(4));
  SDValue Ops[] = {
    Chain,
    VData,
    Op.getOperand(3), // rsrc
    Op.getOperand(4), // vindex
    SDValue(), // voffset -- will be set by setBufferOffsets
    SDValue(), // soffset -- will be set by setBufferOffsets
    SDValue(), // offset -- will be set by setBufferOffsets
    DAG.getTargetConstant(Glc | (Slc << 1), DL, MVT::i32), // cachepolicy
    DAG.getTargetConstant(IdxEn, DL, MVT::i1), // idxen
  };
  setBufferOffsets(Op.getOperand(5), DAG, &Ops[4]);

  unsigned Opc = IntrinsicID == Intrinsic::amdgcn_buffer_store ?
                 AMDGPUISD::BUFFER_STORE : AMDGPUISD::BUFFER_STORE_FORMAT;
  Opc = IsD16 ? AMDGPUISD::BUFFER_STORE_FORMAT_D16 : Opc;
  MemSDNode *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[4], Ops[5], Ops[6], Ops[3]);

  // Handle BUFFER_STORE_BYTE/SHORT overloaded intrinsics
  EVT VDataType = VData.getValueType().getScalarType();
  if (VDataType == MVT::i8 || VDataType == MVT::i16)
    return handleByteShortBufferStores(DAG, VDataType, DL, Ops, M);

  return DAG.getMemIntrinsicNode(Opc, DL, Op->getVTList(), Ops,
                                 M->getMemoryVT(), M->getMemOperand());
}

case Intrinsic::amdgcn_raw_buffer_store:
case Intrinsic::amdgcn_raw_buffer_store_format: {
  const bool IsFormat =
      IntrinsicID == Intrinsic::amdgcn_raw_buffer_store_format;

  SDValue VData = Op.getOperand(2);
  EVT VDataVT = VData.getValueType();
  EVT EltType = VDataVT.getScalarType();
  bool IsD16 = IsFormat && (EltType.getSizeInBits() == 16);
  if (IsD16) {
    VData = handleD16VData(VData, DAG);
    VDataVT = VData.getValueType();
  }

  if (!isTypeLegal(VDataVT)) {
    VData =
        DAG.getNode(ISD::BITCAST, DL,
                    getEquivalentMemType(*DAG.getContext(), VDataVT), VData);
  }

  auto Offsets = splitBufferOffsets(Op.getOperand(4), DAG);
  SDValue Ops[] = {
    Chain,
    VData,
    Op.getOperand(3), // rsrc
    DAG.getConstant(0, DL, MVT::i32), // vindex
    Offsets.first,    // voffset
    Op.getOperand(5), // soffset
    Offsets.second,   // offset
    Op.getOperand(6), // cachepolicy, swizzled buffer
    DAG.getTargetConstant(0, DL, MVT::i1), // idxen
  };
  unsigned Opc =
      IsFormat ? AMDGPUISD::BUFFER_STORE_FORMAT : AMDGPUISD::BUFFER_STORE;
  Opc = IsD16 ? AMDGPUISD::BUFFER_STORE_FORMAT_D16 : Opc;
  MemSDNode *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[4], Ops[5], Ops[6]);

  // Handle BUFFER_STORE_BYTE/SHORT overloaded intrinsics
  if (!IsD16 && !VDataVT.isVector() && EltType.getSizeInBits() < 32)
    return handleByteShortBufferStores(DAG, VDataVT, DL, Ops, M);

  return DAG.getMemIntrinsicNode(Opc, DL, Op->getVTList(), Ops,
                                 M->getMemoryVT(), M->getMemOperand());
}

case Intrinsic::amdgcn_struct_buffer_store:
case Intrinsic::amdgcn_struct_buffer_store_format: {
  const bool IsFormat =
      IntrinsicID == Intrinsic::amdgcn_struct_buffer_store_format;

  SDValue VData = Op.getOperand(2);
  EVT VDataVT = VData.getValueType();
  EVT EltType = VDataVT.getScalarType();
  bool IsD16 = IsFormat && (EltType.getSizeInBits() == 16);

  if (IsD16) {
    VData = handleD16VData(VData, DAG);
    VDataVT = VData.getValueType();
  }

  if (!isTypeLegal(VDataVT)) {
    VData =
        DAG.getNode(ISD::BITCAST, DL,
                    getEquivalentMemType(*DAG.getContext(), VDataVT), VData);
  }

  auto Offsets = splitBufferOffsets(Op.getOperand(5), DAG);
  SDValue Ops[] = {
    Chain,
    VData,
    Op.getOperand(3), // rsrc
    Op.getOperand(4), // vindex
    Offsets.first,    // voffset
    Op.getOperand(6), // soffset
    Offsets.second,   // offset
    Op.getOperand(7), // cachepolicy, swizzled buffer
    DAG.getTargetConstant(1, DL, MVT::i1), // idxen
  };
  unsigned Opc = IntrinsicID == Intrinsic::amdgcn_struct_buffer_store ?
                 AMDGPUISD::BUFFER_STORE : AMDGPUISD::BUFFER_STORE_FORMAT;
  Opc = IsD16 ? AMDGPUISD::BUFFER_STORE_FORMAT_D16 : Opc;
  MemSDNode *M = cast<MemSDNode>(Op);
  updateBufferMMO(M->getMemOperand(), Ops[4], Ops[5], Ops[6], Ops[3]);

  // Handle BUFFER_STORE_BYTE/SHORT overloaded intrinsics
  EVT VDataType = VData.getValueType().getScalarType();
  if (!IsD16 && !VDataVT.isVector() && EltType.getSizeInBits() < 32)
    return handleByteShortBufferStores(DAG, VDataType, DL, Ops, M);

  return DAG.getMemIntrinsicNode(Opc, DL, Op->getVTList(), Ops,
                                 M->getMemoryVT(), M->getMemOperand());
}
case Intrinsic::amdgcn_end_cf:
  return SDValue(DAG.getMachineNode(AMDGPU::SI_END_CF, DL, MVT::Other,
                                    Op->getOperand(2), Chain), 0);

default: {
  if (const AMDGPU::ImageDimIntrinsicInfo *ImageDimIntr =
          AMDGPU::getImageDimIntrinsicInfo(IntrinsicID))
    return lowerImage(Op, ImageDimIntr, DAG, true);

  return Op;
}
}
7847}

7849// The raw.(t)buffer and struct.(t)buffer intrinsics have two offset args:
7850// offset (the offset that is included in bounds checking and swizzling, to be
7851// split between the instruction's voffset and immoffset fields) and soffset
7852// (the offset that is excluded from bounds checking and swizzling, to go in
7853// the instruction's soffset field).  This function takes the first kind of
7854// offset and figures out how to split it between voffset and immoffset.
7855std::pair<SDValue, SDValue> SITargetLowering::splitBufferOffsets(
  SDValue Offset, SelectionDAG &DAG) const {
SDLoc DL(Offset);
const unsigned MaxImm = 4095;
SDValue N0 = Offset;
ConstantSDNode *C1 = nullptr;

if ((C1 = dyn_cast<ConstantSDNode>(N0)))
  N0 = SDValue();
else if (DAG.isBaseWithConstantOffset(N0)) {
  C1 = cast<ConstantSDNode>(N0.getOperand(1));
  N0 = N0.getOperand(0);
}

if (C1) {
  unsigned ImmOffset = C1->getZExtValue();
  // If the immediate value is too big for the immoffset field, put the value
  // and -4096 into the immoffset field so that the value that is copied/added
  // for the voffset field is a multiple of 4096, and it stands more chance
  // of being CSEd with the copy/add for another similar load/store.
  // However, do not do that rounding down to a multiple of 4096 if that is a
  // negative number, as it appears to be illegal to have a negative offset
  // in the vgpr, even if adding the immediate offset makes it positive.
  unsigned Overflow = ImmOffset & ~MaxImm;
  ImmOffset -= Overflow;
  if ((int32_t)Overflow < 0) {
    Overflow += ImmOffset;
    ImmOffset = 0;
  }
  C1 = cast<ConstantSDNode>(DAG.getTargetConstant(ImmOffset, DL, MVT::i32));
  if (Overflow) {
    auto OverflowVal = DAG.getConstant(Overflow, DL, MVT::i32);
    if (!N0)
      N0 = OverflowVal;
    else {
      SDValue Ops[] = { N0, OverflowVal };
      N0 = DAG.getNode(ISD::ADD, DL, MVT::i32, Ops);
    }
  }
}
if (!N0)
  N0 = DAG.getConstant(0, DL, MVT::i32);
if (!C1)
  C1 = cast<ConstantSDNode>(DAG.getTargetConstant(0, DL, MVT::i32));
return {N0, SDValue(C1, 0)};
7900}

7902// Analyze a combined offset from an amdgcn_buffer_ intrinsic and store the
7903// three offsets (voffset, soffset and instoffset) into the SDValue[3] array
7904// pointed to by Offsets.
7905void SITargetLowering::setBufferOffsets(SDValue CombinedOffset,
                                      SelectionDAG &DAG, SDValue *Offsets,
                                      Align Alignment) const {
SDLoc DL(CombinedOffset);
if (auto C = dyn_cast<ConstantSDNode>(CombinedOffset)) {
  uint32_t Imm = C->getZExtValue();
  uint32_t SOffset, ImmOffset;
  if (AMDGPU::splitMUBUFOffset(Imm, SOffset, ImmOffset, Subtarget,
                               Alignment)) {
    Offsets[0] = DAG.getConstant(0, DL, MVT::i32);
    Offsets[1] = DAG.getConstant(SOffset, DL, MVT::i32);
    Offsets[2] = DAG.getTargetConstant(ImmOffset, DL, MVT::i32);
    return;
  }
}
if (DAG.isBaseWithConstantOffset(CombinedOffset)) {
  SDValue N0 = CombinedOffset.getOperand(0);
  SDValue N1 = CombinedOffset.getOperand(1);
  uint32_t SOffset, ImmOffset;
  int Offset = cast<ConstantSDNode>(N1)->getSExtValue();
  if (Offset >= 0 && AMDGPU::splitMUBUFOffset(Offset, SOffset, ImmOffset,
                                              Subtarget, Alignment)) {
    Offsets[0] = N0;
    Offsets[1] = DAG.getConstant(SOffset, DL, MVT::i32);
    Offsets[2] = DAG.getTargetConstant(ImmOffset, DL, MVT::i32);
    return;
  }
}
Offsets[0] = CombinedOffset;
Offsets[1] = DAG.getConstant(0, DL, MVT::i32);
Offsets[2] = DAG.getTargetConstant(0, DL, MVT::i32);
7936}

7938// Handle 8 bit and 16 bit buffer loads
7939SDValue SITargetLowering::handleByteShortBufferLoads(SelectionDAG &DAG,
                                                   EVT LoadVT, SDLoc DL,
                                                   ArrayRef<SDValue> Ops,
                                                   MemSDNode *M) const {
EVT IntVT = LoadVT.changeTypeToInteger();
unsigned Opc = (LoadVT.getScalarType() == MVT::i8) ?
       AMDGPUISD::BUFFER_LOAD_UBYTE : AMDGPUISD::BUFFER_LOAD_USHORT;

SDVTList ResList = DAG.getVTList(MVT::i32, MVT::Other);
SDValue BufferLoad = DAG.getMemIntrinsicNode(Opc, DL, ResList,
                                             Ops, IntVT,
                                             M->getMemOperand());
SDValue LoadVal = DAG.getNode(ISD::TRUNCATE, DL, IntVT, BufferLoad);
LoadVal = DAG.getNode(ISD::BITCAST, DL, LoadVT, LoadVal);

return DAG.getMergeValues({LoadVal, BufferLoad.getValue(1)}, DL);
7955}

7957// Handle 8 bit and 16 bit buffer stores
7958SDValue SITargetLowering::handleByteShortBufferStores(SelectionDAG &DAG,
                                                    EVT VDataType, SDLoc DL,
                                                    SDValue Ops[],
                                                    MemSDNode *M) const {
if (VDataType == MVT::f16)
  Ops[1] = DAG.getNode(ISD::BITCAST, DL, MVT::i16, Ops[1]);

SDValue BufferStoreExt = DAG.getNode(ISD::ANY_EXTEND, DL, MVT::i32, Ops[1]);
Ops[1] = BufferStoreExt;
unsigned Opc = (VDataType == MVT::i8) ? AMDGPUISD::BUFFER_STORE_BYTE :
                               AMDGPUISD::BUFFER_STORE_SHORT;
ArrayRef<SDValue> OpsRef = makeArrayRef(&Ops[0], 9);
return DAG.getMemIntrinsicNode(Opc, DL, M->getVTList(), OpsRef, VDataType,
                                   M->getMemOperand());
7972}

7974static SDValue getLoadExtOrTrunc(SelectionDAG &DAG,
                               ISD::LoadExtType ExtType, SDValue Op,
                               const SDLoc &SL, EVT VT) {
if (VT.bitsLT(Op.getValueType()))
  return DAG.getNode(ISD::TRUNCATE, SL, VT, Op);

switch (ExtType) {
case ISD::SEXTLOAD:
  return DAG.getNode(ISD::SIGN_EXTEND, SL, VT, Op);
case ISD::ZEXTLOAD:
  return DAG.getNode(ISD::ZERO_EXTEND, SL, VT, Op);
case ISD::EXTLOAD:
  return DAG.getNode(ISD::ANY_EXTEND, SL, VT, Op);
case ISD::NON_EXTLOAD:
  return Op;
}

llvm_unreachable("invalid ext type")__builtin_unreachable();
7992}

7994SDValue SITargetLowering::widenLoad(LoadSDNode *Ld, DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
if (Ld->getAlignment() < 4 || Ld->isDivergent())
  return SDValue();

// FIXME: Constant loads should all be marked invariant.
unsigned AS = Ld->getAddressSpace();
if (AS != AMDGPUAS::CONSTANT_ADDRESS &&
    AS != AMDGPUAS::CONSTANT_ADDRESS_32BIT &&
    (AS != AMDGPUAS::GLOBAL_ADDRESS || !Ld->isInvariant()))
  return SDValue();

// Don't do this early, since it may interfere with adjacent load merging for
// illegal types. We can avoid losing alignment information for exotic types
// pre-legalize.
EVT MemVT = Ld->getMemoryVT();
if ((MemVT.isSimple() && !DCI.isAfterLegalizeDAG()) ||
    MemVT.getSizeInBits() >= 32)
  return SDValue();

SDLoc SL(Ld);

assert((!MemVT.isVector() || Ld->getExtensionType() == ISD::NON_EXTLOAD) &&((void)0)
       "unexpected vector extload")((void)0);

// TODO: Drop only high part of range.
SDValue Ptr = Ld->getBasePtr();
SDValue NewLoad = DAG.getLoad(ISD::UNINDEXED, ISD::NON_EXTLOAD,
                              MVT::i32, SL, Ld->getChain(), Ptr,
                              Ld->getOffset(),
                              Ld->getPointerInfo(), MVT::i32,
                              Ld->getAlignment(),
                              Ld->getMemOperand()->getFlags(),
                              Ld->getAAInfo(),
                              nullptr); // Drop ranges

EVT TruncVT = EVT::getIntegerVT(*DAG.getContext(), MemVT.getSizeInBits());
if (MemVT.isFloatingPoint()) {
  assert(Ld->getExtensionType() == ISD::NON_EXTLOAD &&((void)0)
         "unexpected fp extload")((void)0);
  TruncVT = MemVT.changeTypeToInteger();
}

SDValue Cvt = NewLoad;
if (Ld->getExtensionType() == ISD::SEXTLOAD) {
  Cvt = DAG.getNode(ISD::SIGN_EXTEND_INREG, SL, MVT::i32, NewLoad,
                    DAG.getValueType(TruncVT));
} else if (Ld->getExtensionType() == ISD::ZEXTLOAD ||
           Ld->getExtensionType() == ISD::NON_EXTLOAD) {
  Cvt = DAG.getZeroExtendInReg(NewLoad, SL, TruncVT);
} else {
  assert(Ld->getExtensionType() == ISD::EXTLOAD)((void)0);
}

EVT VT = Ld->getValueType(0);
EVT IntVT = EVT::getIntegerVT(*DAG.getContext(), VT.getSizeInBits());

DCI.AddToWorklist(Cvt.getNode());

// We may need to handle exotic cases, such as i16->i64 extloads, so insert
// the appropriate extension from the 32-bit load.
Cvt = getLoadExtOrTrunc(DAG, Ld->getExtensionType(), Cvt, SL, IntVT);
DCI.AddToWorklist(Cvt.getNode());

// Handle conversion back to floating point if necessary.
Cvt = DAG.getNode(ISD::BITCAST, SL, VT, Cvt);

return DAG.getMergeValues({ Cvt, NewLoad.getValue(1) }, SL);
8062}

8064SDValue SITargetLowering::LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
SDLoc DL(Op);
LoadSDNode *Load = cast<LoadSDNode>(Op);
ISD::LoadExtType ExtType = Load->getExtensionType();
EVT MemVT = Load->getMemoryVT();

if (ExtType == ISD::NON_EXTLOAD && MemVT.getSizeInBits() < 32) {
  if (MemVT == MVT::i16 && isTypeLegal(MVT::i16))
    return SDValue();

  // FIXME: Copied from PPC
  // First, load into 32 bits, then truncate to 1 bit.

  SDValue Chain = Load->getChain();
  SDValue BasePtr = Load->getBasePtr();
  MachineMemOperand *MMO = Load->getMemOperand();

  EVT RealMemVT = (MemVT == MVT::i1) ? MVT::i8 : MVT::i16;

  SDValue NewLD = DAG.getExtLoad(ISD::EXTLOAD, DL, MVT::i32, Chain,
                                 BasePtr, RealMemVT, MMO);

  if (!MemVT.isVector()) {
    SDValue Ops[] = {
      DAG.getNode(ISD::TRUNCATE, DL, MemVT, NewLD),
      NewLD.getValue(1)
    };

    return DAG.getMergeValues(Ops, DL);
  }

  SmallVector<SDValue, 3> Elts;
  for (unsigned I = 0, N = MemVT.getVectorNumElements(); I != N; ++I) {
    SDValue Elt = DAG.getNode(ISD::SRL, DL, MVT::i32, NewLD,
                              DAG.getConstant(I, DL, MVT::i32));

    Elts.push_back(DAG.getNode(ISD::TRUNCATE, DL, MVT::i1, Elt));
  }

  SDValue Ops[] = {
    DAG.getBuildVector(MemVT, DL, Elts),
    NewLD.getValue(1)
  };

  return DAG.getMergeValues(Ops, DL);
}

if (!MemVT.isVector())
  return SDValue();

assert(Op.getValueType().getVectorElementType() == MVT::i32 &&((void)0)
       "Custom lowering for non-i32 vectors hasn't been implemented.")((void)0);

unsigned Alignment = Load->getAlignment();
unsigned AS = Load->getAddressSpace();
if (Subtarget->hasLDSMisalignedBug() &&
    AS == AMDGPUAS::FLAT_ADDRESS &&
    Alignment < MemVT.getStoreSize() && MemVT.getSizeInBits() > 32) {
  return SplitVectorLoad(Op, DAG);
}

MachineFunction &MF = DAG.getMachineFunction();
SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
// If there is a possibilty that flat instruction access scratch memory
// then we need to use the same legalization rules we use for private.
if (AS == AMDGPUAS::FLAT_ADDRESS &&
    !Subtarget->hasMultiDwordFlatScratchAddressing())
  AS = MFI->hasFlatScratchInit() ?
       AMDGPUAS::PRIVATE_ADDRESS : AMDGPUAS::GLOBAL_ADDRESS;

unsigned NumElements = MemVT.getVectorNumElements();

if (AS == AMDGPUAS::CONSTANT_ADDRESS ||
    AS == AMDGPUAS::CONSTANT_ADDRESS_32BIT) {
  if (!Op->isDivergent() && Alignment >= 4 && NumElements < 32) {
    if (MemVT.isPow2VectorType())
      return SDValue();
    return WidenOrSplitVectorLoad(Op, DAG);
  }
  // Non-uniform loads will be selected to MUBUF instructions, so they
  // have the same legalization requirements as global and private
  // loads.
  //
}

if (AS == AMDGPUAS::CONSTANT_ADDRESS ||
    AS == AMDGPUAS::CONSTANT_ADDRESS_32BIT ||
    AS == AMDGPUAS::GLOBAL_ADDRESS) {
  if (Subtarget->getScalarizeGlobalBehavior() && !Op->isDivergent() &&
      Load->isSimple() && isMemOpHasNoClobberedMemOperand(Load) &&
      Alignment >= 4 && NumElements < 32) {
    if (MemVT.isPow2VectorType())
      return SDValue();
    return WidenOrSplitVectorLoad(Op, DAG);
  }
  // Non-uniform loads will be selected to MUBUF instructions, so they
  // have the same legalization requirements as global and private
  // loads.
  //
}
if (AS == AMDGPUAS::CONSTANT_ADDRESS ||
    AS == AMDGPUAS::CONSTANT_ADDRESS_32BIT ||
    AS == AMDGPUAS::GLOBAL_ADDRESS ||
    AS == AMDGPUAS::FLAT_ADDRESS) {
  if (NumElements > 4)
    return SplitVectorLoad(Op, DAG);
  // v3 loads not supported on SI.
  if (NumElements == 3 && !Subtarget->hasDwordx3LoadStores())
    return WidenOrSplitVectorLoad(Op, DAG);

  // v3 and v4 loads are supported for private and global memory.
  return SDValue();
}
if (AS == AMDGPUAS::PRIVATE_ADDRESS) {
  // Depending on the setting of the private_element_size field in the
  // resource descriptor, we can only make private accesses up to a certain
  // size.
  switch (Subtarget->getMaxPrivateElementSize()) {
  case 4: {
    SDValue Ops[2];
    std::tie(Ops[0], Ops[1]) = scalarizeVectorLoad(Load, DAG);
    return DAG.getMergeValues(Ops, DL);
  }
  case 8:
    if (NumElements > 2)
      return SplitVectorLoad(Op, DAG);
    return SDValue();
  case 16:
    // Same as global/flat
    if (NumElements > 4)
      return SplitVectorLoad(Op, DAG);
    // v3 loads not supported on SI.
    if (NumElements == 3 && !Subtarget->hasDwordx3LoadStores())
      return WidenOrSplitVectorLoad(Op, DAG);

    return SDValue();
  default:
    llvm_unreachable("unsupported private_element_size")__builtin_unreachable();
  }
} else if (AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::REGION_ADDRESS) {
  // Use ds_read_b128 or ds_read_b96 when possible.
  if (Subtarget->hasDS96AndDS128() &&
      ((Subtarget->useDS128() && MemVT.getStoreSize() == 16) ||
       MemVT.getStoreSize() == 12) &&
      allowsMisalignedMemoryAccessesImpl(MemVT.getSizeInBits(), AS,
                                         Load->getAlign()))
    return SDValue();

  if (NumElements > 2)
    return SplitVectorLoad(Op, DAG);

  // SI has a hardware bug in the LDS / GDS boounds checking: if the base
  // address is negative, then the instruction is incorrectly treated as
  // out-of-bounds even if base + offsets is in bounds. Split vectorized
  // loads here to avoid emitting ds_read2_b32. We may re-combine the
  // load later in the SILoadStoreOptimizer.
  if (Subtarget->getGeneration() == AMDGPUSubtarget::SOUTHERN_ISLANDS &&
      NumElements == 2 && MemVT.getStoreSize() == 8 &&
      Load->getAlignment() < 8) {
    return SplitVectorLoad(Op, DAG);
  }
}

if (!allowsMemoryAccessForAlignment(*DAG.getContext(), DAG.getDataLayout(),
                                    MemVT, *Load->getMemOperand())) {
  SDValue Ops[2];
  std::tie(Ops[0], Ops[1]) = expandUnalignedLoad(Load, DAG);
  return DAG.getMergeValues(Ops, DL);
}

return SDValue();
8235}

8237SDValue SITargetLowering::LowerSELECT(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
assert(VT.getSizeInBits() == 64)((void)0);

SDLoc DL(Op);
SDValue Cond = Op.getOperand(0);

SDValue Zero = DAG.getConstant(0, DL, MVT::i32);
SDValue One = DAG.getConstant(1, DL, MVT::i32);

SDValue LHS = DAG.getNode(ISD::BITCAST, DL, MVT::v2i32, Op.getOperand(1));
SDValue RHS = DAG.getNode(ISD::BITCAST, DL, MVT::v2i32, Op.getOperand(2));

SDValue Lo0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, LHS, Zero);
SDValue Lo1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, RHS, Zero);

SDValue Lo = DAG.getSelect(DL, MVT::i32, Cond, Lo0, Lo1);

SDValue Hi0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, LHS, One);
SDValue Hi1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, RHS, One);

SDValue Hi = DAG.getSelect(DL, MVT::i32, Cond, Hi0, Hi1);

SDValue Res = DAG.getBuildVector(MVT::v2i32, DL, {Lo, Hi});
return DAG.getNode(ISD::BITCAST, DL, VT, Res);
8262}

8264// Catch division cases where we can use shortcuts with rcp and rsq
8265// instructions.
8266SDValue SITargetLowering::lowerFastUnsafeFDIV(SDValue Op,
                                            SelectionDAG &DAG) const {
SDLoc SL(Op);
SDValue LHS = Op.getOperand(0);
SDValue RHS = Op.getOperand(1);
EVT VT = Op.getValueType();
const SDNodeFlags Flags = Op->getFlags();

bool AllowInaccurateRcp = Flags.hasApproximateFuncs();

// Without !fpmath accuracy information, we can't do more because we don't
// know exactly whether rcp is accurate enough to meet !fpmath requirement.
if (!AllowInaccurateRcp)
  return SDValue();

if (const ConstantFPSDNode *CLHS = dyn_cast<ConstantFPSDNode>(LHS)) {
  if (CLHS->isExactlyValue(1.0)) {
    // v_rcp_f32 and v_rsq_f32 do not support denormals, and according to
    // the CI documentation has a worst case error of 1 ulp.
    // OpenCL requires <= 2.5 ulp for 1.0 / x, so it should always be OK to
    // use it as long as we aren't trying to use denormals.
    //
    // v_rcp_f16 and v_rsq_f16 DO support denormals.

    // 1.0 / sqrt(x) -> rsq(x)

    // XXX - Is UnsafeFPMath sufficient to do this for f64? The maximum ULP
    // error seems really high at 2^29 ULP.
    if (RHS.getOpcode() == ISD::FSQRT)
      return DAG.getNode(AMDGPUISD::RSQ, SL, VT, RHS.getOperand(0));

    // 1.0 / x -> rcp(x)
    return DAG.getNode(AMDGPUISD::RCP, SL, VT, RHS);
  }

  // Same as for 1.0, but expand the sign out of the constant.
  if (CLHS->isExactlyValue(-1.0)) {
    // -1.0 / x -> rcp (fneg x)
    SDValue FNegRHS = DAG.getNode(ISD::FNEG, SL, VT, RHS);
    return DAG.getNode(AMDGPUISD::RCP, SL, VT, FNegRHS);
  }
}

// Turn into multiply by the reciprocal.
// x / y -> x * (1.0 / y)
SDValue Recip = DAG.getNode(AMDGPUISD::RCP, SL, VT, RHS);
return DAG.getNode(ISD::FMUL, SL, VT, LHS, Recip, Flags);
8313}

8315SDValue SITargetLowering::lowerFastUnsafeFDIV64(SDValue Op,
                                              SelectionDAG &DAG) const {
SDLoc SL(Op);
SDValue X = Op.getOperand(0);
SDValue Y = Op.getOperand(1);
EVT VT = Op.getValueType();
const SDNodeFlags Flags = Op->getFlags();

bool AllowInaccurateDiv = Flags.hasApproximateFuncs() ||
                          DAG.getTarget().Options.UnsafeFPMath;
if (!AllowInaccurateDiv)
  return SDValue();

SDValue NegY = DAG.getNode(ISD::FNEG, SL, VT, Y);
SDValue One = DAG.getConstantFP(1.0, SL, VT);

SDValue R = DAG.getNode(AMDGPUISD::RCP, SL, VT, Y);
SDValue Tmp0 = DAG.getNode(ISD::FMA, SL, VT, NegY, R, One);

R = DAG.getNode(ISD::FMA, SL, VT, Tmp0, R, R);
SDValue Tmp1 = DAG.getNode(ISD::FMA, SL, VT, NegY, R, One);
R = DAG.getNode(ISD::FMA, SL, VT, Tmp1, R, R);
SDValue Ret = DAG.getNode(ISD::FMUL, SL, VT, X, R);
SDValue Tmp2 = DAG.getNode(ISD::FMA, SL, VT, NegY, Ret, X);
return DAG.getNode(ISD::FMA, SL, VT, Tmp2, R, Ret);
8340}

8342static SDValue getFPBinOp(SelectionDAG &DAG, unsigned Opcode, const SDLoc &SL,
                        EVT VT, SDValue A, SDValue B, SDValue GlueChain,
                        SDNodeFlags Flags) {
if (GlueChain->getNumValues() <= 1) {
  return DAG.getNode(Opcode, SL, VT, A, B, Flags);
}

assert(GlueChain->getNumValues() == 3)((void)0);

SDVTList VTList = DAG.getVTList(VT, MVT::Other, MVT::Glue);
switch (Opcode) {
default: llvm_unreachable("no chain equivalent for opcode")__builtin_unreachable();
case ISD::FMUL:
  Opcode = AMDGPUISD::FMUL_W_CHAIN;
  break;
}

return DAG.getNode(Opcode, SL, VTList,
                   {GlueChain.getValue(1), A, B, GlueChain.getValue(2)},
                   Flags);
8362}

8364static SDValue getFPTernOp(SelectionDAG &DAG, unsigned Opcode, const SDLoc &SL,
                         EVT VT, SDValue A, SDValue B, SDValue C,
                         SDValue GlueChain, SDNodeFlags Flags) {
if (GlueChain->getNumValues() <= 1) {
  return DAG.getNode(Opcode, SL, VT, {A, B, C}, Flags);
}

assert(GlueChain->getNumValues() == 3)((void)0);

SDVTList VTList = DAG.getVTList(VT, MVT::Other, MVT::Glue);
switch (Opcode) {
default: llvm_unreachable("no chain equivalent for opcode")__builtin_unreachable();
case ISD::FMA:
  Opcode = AMDGPUISD::FMA_W_CHAIN;
  break;
}

return DAG.getNode(Opcode, SL, VTList,
                   {GlueChain.getValue(1), A, B, C, GlueChain.getValue(2)},
                   Flags);
8384}

8386SDValue SITargetLowering::LowerFDIV16(SDValue Op, SelectionDAG &DAG) const {
if (SDValue FastLowered = lowerFastUnsafeFDIV(Op, DAG))
  return FastLowered;

SDLoc SL(Op);
SDValue Src0 = Op.getOperand(0);
SDValue Src1 = Op.getOperand(1);

SDValue CvtSrc0 = DAG.getNode(ISD::FP_EXTEND, SL, MVT::f32, Src0);
SDValue CvtSrc1 = DAG.getNode(ISD::FP_EXTEND, SL, MVT::f32, Src1);

SDValue RcpSrc1 = DAG.getNode(AMDGPUISD::RCP, SL, MVT::f32, CvtSrc1);
SDValue Quot = DAG.getNode(ISD::FMUL, SL, MVT::f32, CvtSrc0, RcpSrc1);

SDValue FPRoundFlag = DAG.getTargetConstant(0, SL, MVT::i32);
SDValue BestQuot = DAG.getNode(ISD::FP_ROUND, SL, MVT::f16, Quot, FPRoundFlag);

return DAG.getNode(AMDGPUISD::DIV_FIXUP, SL, MVT::f16, BestQuot, Src1, Src0);
8404}

8406// Faster 2.5 ULP division that does not support denormals.
8407SDValue SITargetLowering::lowerFDIV_FAST(SDValue Op, SelectionDAG &DAG) const {
SDLoc SL(Op);
SDValue LHS = Op.getOperand(1);
SDValue RHS = Op.getOperand(2);

SDValue r1 = DAG.getNode(ISD::FABS, SL, MVT::f32, RHS);

const APFloat K0Val(BitsToFloat(0x6f800000));
const SDValue K0 = DAG.getConstantFP(K0Val, SL, MVT::f32);

const APFloat K1Val(BitsToFloat(0x2f800000));
const SDValue K1 = DAG.getConstantFP(K1Val, SL, MVT::f32);

const SDValue One = DAG.getConstantFP(1.0, SL, MVT::f32);

EVT SetCCVT =
  getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), MVT::f32);

SDValue r2 = DAG.getSetCC(SL, SetCCVT, r1, K0, ISD::SETOGT);

SDValue r3 = DAG.getNode(ISD::SELECT, SL, MVT::f32, r2, K1, One);

// TODO: Should this propagate fast-math-flags?
r1 = DAG.getNode(ISD::FMUL, SL, MVT::f32, RHS, r3);

// rcp does not support denormals.
SDValue r0 = DAG.getNode(AMDGPUISD::RCP, SL, MVT::f32, r1);

SDValue Mul = DAG.getNode(ISD::FMUL, SL, MVT::f32, LHS, r0);

return DAG.getNode(ISD::FMUL, SL, MVT::f32, r3, Mul);
8438}

8440// Returns immediate value for setting the F32 denorm mode when using the
8441// S_DENORM_MODE instruction.
8442static SDValue getSPDenormModeValue(int SPDenormMode, SelectionDAG &DAG,
                                  const SDLoc &SL, const GCNSubtarget *ST) {
assert(ST->hasDenormModeInst() && "Requires S_DENORM_MODE")((void)0);
int DPDenormModeDefault = hasFP64FP16Denormals(DAG.getMachineFunction())
                              ? FP_DENORM_FLUSH_NONE3
                              : FP_DENORM_FLUSH_IN_FLUSH_OUT0;

int Mode = SPDenormMode | (DPDenormModeDefault << 2);
return DAG.getTargetConstant(Mode, SL, MVT::i32);
8451}

8453SDValue SITargetLowering::LowerFDIV32(SDValue Op, SelectionDAG &DAG) const {
if (SDValue FastLowered = lowerFastUnsafeFDIV(Op, DAG))
  return FastLowered;

// The selection matcher assumes anything with a chain selecting to a
// mayRaiseFPException machine instruction. Since we're introducing a chain
// here, we need to explicitly report nofpexcept for the regular fdiv
// lowering.
SDNodeFlags Flags = Op->getFlags();
Flags.setNoFPExcept(true);

SDLoc SL(Op);
SDValue LHS = Op.getOperand(0);
SDValue RHS = Op.getOperand(1);

const SDValue One = DAG.getConstantFP(1.0, SL, MVT::f32);

SDVTList ScaleVT = DAG.getVTList(MVT::f32, MVT::i1);

SDValue DenominatorScaled = DAG.getNode(AMDGPUISD::DIV_SCALE, SL, ScaleVT,
                                        {RHS, RHS, LHS}, Flags);
SDValue NumeratorScaled = DAG.getNode(AMDGPUISD::DIV_SCALE, SL, ScaleVT,
                                      {LHS, RHS, LHS}, Flags);

// Denominator is scaled to not be denormal, so using rcp is ok.
SDValue ApproxRcp = DAG.getNode(AMDGPUISD::RCP, SL, MVT::f32,
                                DenominatorScaled, Flags);
SDValue NegDivScale0 = DAG.getNode(ISD::FNEG, SL, MVT::f32,
                                   DenominatorScaled, Flags);

const unsigned Denorm32Reg = AMDGPU::Hwreg::ID_MODE |
                             (4 << AMDGPU::Hwreg::OFFSET_SHIFT_) |
                             (1 << AMDGPU::Hwreg::WIDTH_M1_SHIFT_);
const SDValue BitField = DAG.getTargetConstant(Denorm32Reg, SL, MVT::i32);

const bool HasFP32Denormals = hasFP32Denormals(DAG.getMachineFunction());

if (!HasFP32Denormals) {
  // Note we can't use the STRICT_FMA/STRICT_FMUL for the non-strict FDIV
  // lowering. The chain dependence is insufficient, and we need glue. We do
  // not need the glue variants in a strictfp function.

  SDVTList BindParamVTs = DAG.getVTList(MVT::Other, MVT::Glue);

  SDNode *EnableDenorm;
  if (Subtarget->hasDenormModeInst()) {
    const SDValue EnableDenormValue =
        getSPDenormModeValue(FP_DENORM_FLUSH_NONE3, DAG, SL, Subtarget);

    EnableDenorm = DAG.getNode(AMDGPUISD::DENORM_MODE, SL, BindParamVTs,
                               DAG.getEntryNode(), EnableDenormValue).getNode();
  } else {
    const SDValue EnableDenormValue = DAG.getConstant(FP_DENORM_FLUSH_NONE3,
                                                      SL, MVT::i32);
    EnableDenorm =
        DAG.getMachineNode(AMDGPU::S_SETREG_B32, SL, BindParamVTs,
                           {EnableDenormValue, BitField, DAG.getEntryNode()});
  }

  SDValue Ops[3] = {
    NegDivScale0,
    SDValue(EnableDenorm, 0),
    SDValue(EnableDenorm, 1)
  };

  NegDivScale0 = DAG.getMergeValues(Ops, SL);
}

SDValue Fma0 = getFPTernOp(DAG, ISD::FMA, SL, MVT::f32, NegDivScale0,
                           ApproxRcp, One, NegDivScale0, Flags);

SDValue Fma1 = getFPTernOp(DAG, ISD::FMA, SL, MVT::f32, Fma0, ApproxRcp,
                           ApproxRcp, Fma0, Flags);

SDValue Mul = getFPBinOp(DAG, ISD::FMUL, SL, MVT::f32, NumeratorScaled,
                         Fma1, Fma1, Flags);

SDValue Fma2 = getFPTernOp(DAG, ISD::FMA, SL, MVT::f32, NegDivScale0, Mul,
                           NumeratorScaled, Mul, Flags);

SDValue Fma3 = getFPTernOp(DAG, ISD::FMA, SL, MVT::f32,
                           Fma2, Fma1, Mul, Fma2, Flags);

SDValue Fma4 = getFPTernOp(DAG, ISD::FMA, SL, MVT::f32, NegDivScale0, Fma3,
                           NumeratorScaled, Fma3, Flags);

if (!HasFP32Denormals) {
  SDNode *DisableDenorm;
  if (Subtarget->hasDenormModeInst()) {
    const SDValue DisableDenormValue =
        getSPDenormModeValue(FP_DENORM_FLUSH_IN_FLUSH_OUT0, DAG, SL, Subtarget);

    DisableDenorm = DAG.getNode(AMDGPUISD::DENORM_MODE, SL, MVT::Other,
                                Fma4.getValue(1), DisableDenormValue,
                                Fma4.getValue(2)).getNode();
  } else {
    const SDValue DisableDenormValue =
        DAG.getConstant(FP_DENORM_FLUSH_IN_FLUSH_OUT0, SL, MVT::i32);

    DisableDenorm = DAG.getMachineNode(
        AMDGPU::S_SETREG_B32, SL, MVT::Other,
        {DisableDenormValue, BitField, Fma4.getValue(1), Fma4.getValue(2)});
  }

  SDValue OutputChain = DAG.getNode(ISD::TokenFactor, SL, MVT::Other,
                                    SDValue(DisableDenorm, 0), DAG.getRoot());
  DAG.setRoot(OutputChain);
}

SDValue Scale = NumeratorScaled.getValue(1);
SDValue Fmas = DAG.getNode(AMDGPUISD::DIV_FMAS, SL, MVT::f32,
                           {Fma4, Fma1, Fma3, Scale}, Flags);

return DAG.getNode(AMDGPUISD::DIV_FIXUP, SL, MVT::f32, Fmas, RHS, LHS, Flags);
8567}

8569SDValue SITargetLowering::LowerFDIV64(SDValue Op, SelectionDAG &DAG) const {
if (SDValue FastLowered = lowerFastUnsafeFDIV64(Op, DAG))
  return FastLowered;

SDLoc SL(Op);
SDValue X = Op.getOperand(0);
SDValue Y = Op.getOperand(1);

const SDValue One = DAG.getConstantFP(1.0, SL, MVT::f64);

SDVTList ScaleVT = DAG.getVTList(MVT::f64, MVT::i1);

SDValue DivScale0 = DAG.getNode(AMDGPUISD::DIV_SCALE, SL, ScaleVT, Y, Y, X);

SDValue NegDivScale0 = DAG.getNode(ISD::FNEG, SL, MVT::f64, DivScale0);

SDValue Rcp = DAG.getNode(AMDGPUISD::RCP, SL, MVT::f64, DivScale0);

SDValue Fma0 = DAG.getNode(ISD::FMA, SL, MVT::f64, NegDivScale0, Rcp, One);

SDValue Fma1 = DAG.getNode(ISD::FMA, SL, MVT::f64, Rcp, Fma0, Rcp);

SDValue Fma2 = DAG.getNode(ISD::FMA, SL, MVT::f64, NegDivScale0, Fma1, One);

SDValue DivScale1 = DAG.getNode(AMDGPUISD::DIV_SCALE, SL, ScaleVT, X, Y, X);

SDValue Fma3 = DAG.getNode(ISD::FMA, SL, MVT::f64, Fma1, Fma2, Fma1);
SDValue Mul = DAG.getNode(ISD::FMUL, SL, MVT::f64, DivScale1, Fma3);

SDValue Fma4 = DAG.getNode(ISD::FMA, SL, MVT::f64,
                           NegDivScale0, Mul, DivScale1);

SDValue Scale;

if (!Subtarget->hasUsableDivScaleConditionOutput()) {
  // Workaround a hardware bug on SI where the condition output from div_scale
  // is not usable.

  const SDValue Hi = DAG.getConstant(1, SL, MVT::i32);

  // Figure out if the scale to use for div_fmas.
  SDValue NumBC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, X);
  SDValue DenBC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, Y);
  SDValue Scale0BC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, DivScale0);
  SDValue Scale1BC = DAG.getNode(ISD::BITCAST, SL, MVT::v2i32, DivScale1);

  SDValue NumHi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, NumBC, Hi);
  SDValue DenHi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, DenBC, Hi);

  SDValue Scale0Hi
    = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, Scale0BC, Hi);
  SDValue Scale1Hi
    = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, Scale1BC, Hi);

  SDValue CmpDen = DAG.getSetCC(SL, MVT::i1, DenHi, Scale0Hi, ISD::SETEQ);
  SDValue CmpNum = DAG.getSetCC(SL, MVT::i1, NumHi, Scale1Hi, ISD::SETEQ);
  Scale = DAG.getNode(ISD::XOR, SL, MVT::i1, CmpNum, CmpDen);
} else {
  Scale = DivScale1.getValue(1);
}

SDValue Fmas = DAG.getNode(AMDGPUISD::DIV_FMAS, SL, MVT::f64,
                           Fma4, Fma3, Mul, Scale);

return DAG.getNode(AMDGPUISD::DIV_FIXUP, SL, MVT::f64, Fmas, Y, X);
8634}

8636SDValue SITargetLowering::LowerFDIV(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();

if (VT == MVT::f32)
  return LowerFDIV32(Op, DAG);

if (VT == MVT::f64)
  return LowerFDIV64(Op, DAG);

if (VT == MVT::f16)
  return LowerFDIV16(Op, DAG);

llvm_unreachable("Unexpected type for fdiv")__builtin_unreachable();
8649}

8651SDValue SITargetLowering::LowerSTORE(SDValue Op, SelectionDAG &DAG) const {
SDLoc DL(Op);
StoreSDNode *Store = cast<StoreSDNode>(Op);
EVT VT = Store->getMemoryVT();

if (VT == MVT::i1) {
  return DAG.getTruncStore(Store->getChain(), DL,
     DAG.getSExtOrTrunc(Store->getValue(), DL, MVT::i32),
     Store->getBasePtr(), MVT::i1, Store->getMemOperand());
}

assert(VT.isVector() &&((void)0)
       Store->getValue().getValueType().getScalarType() == MVT::i32)((void)0);

unsigned AS = Store->getAddressSpace();
if (Subtarget->hasLDSMisalignedBug() &&
    AS == AMDGPUAS::FLAT_ADDRESS &&
    Store->getAlignment() < VT.getStoreSize() && VT.getSizeInBits() > 32) {
  return SplitVectorStore(Op, DAG);
}

MachineFunction &MF = DAG.getMachineFunction();
SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
// If there is a possibilty that flat instruction access scratch memory
// then we need to use the same legalization rules we use for private.
if (AS == AMDGPUAS::FLAT_ADDRESS &&
    !Subtarget->hasMultiDwordFlatScratchAddressing())
  AS = MFI->hasFlatScratchInit() ?
       AMDGPUAS::PRIVATE_ADDRESS : AMDGPUAS::GLOBAL_ADDRESS;

unsigned NumElements = VT.getVectorNumElements();
if (AS == AMDGPUAS::GLOBAL_ADDRESS ||
    AS == AMDGPUAS::FLAT_ADDRESS) {
  if (NumElements > 4)
    return SplitVectorStore(Op, DAG);
  // v3 stores not supported on SI.
  if (NumElements == 3 && !Subtarget->hasDwordx3LoadStores())
    return SplitVectorStore(Op, DAG);

  if (!allowsMemoryAccessForAlignment(*DAG.getContext(), DAG.getDataLayout(),
                                      VT, *Store->getMemOperand()))
    return expandUnalignedStore(Store, DAG);

  return SDValue();
} else if (AS == AMDGPUAS::PRIVATE_ADDRESS) {
  switch (Subtarget->getMaxPrivateElementSize()) {
  case 4:
    return scalarizeVectorStore(Store, DAG);
  case 8:
    if (NumElements > 2)
      return SplitVectorStore(Op, DAG);
    return SDValue();
  case 16:
    if (NumElements > 4 ||
        (NumElements == 3 && !Subtarget->enableFlatScratch()))
      return SplitVectorStore(Op, DAG);
    return SDValue();
  default:
    llvm_unreachable("unsupported private_element_size")__builtin_unreachable();
  }
} else if (AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::REGION_ADDRESS) {
  // Use ds_write_b128 or ds_write_b96 when possible.
  if (Subtarget->hasDS96AndDS128() &&
      ((Subtarget->useDS128() && VT.getStoreSize() == 16) ||
       (VT.getStoreSize() == 12)) &&
      allowsMisalignedMemoryAccessesImpl(VT.getSizeInBits(), AS,
                                         Store->getAlign()))
    return SDValue();

  if (NumElements > 2)
    return SplitVectorStore(Op, DAG);

  // SI has a hardware bug in the LDS / GDS boounds checking: if the base
  // address is negative, then the instruction is incorrectly treated as
  // out-of-bounds even if base + offsets is in bounds. Split vectorized
  // stores here to avoid emitting ds_write2_b32. We may re-combine the
  // store later in the SILoadStoreOptimizer.
  if (!Subtarget->hasUsableDSOffset() &&
      NumElements == 2 && VT.getStoreSize() == 8 &&
      Store->getAlignment() < 8) {
    return SplitVectorStore(Op, DAG);
  }

  if (!allowsMemoryAccessForAlignment(*DAG.getContext(), DAG.getDataLayout(),
                                      VT, *Store->getMemOperand())) {
    if (VT.isVector())
      return SplitVectorStore(Op, DAG);
    return expandUnalignedStore(Store, DAG);
  }

  return SDValue();
} else {
  llvm_unreachable("unhandled address space")__builtin_unreachable();
}
8745}

8747SDValue SITargetLowering::LowerTrig(SDValue Op, SelectionDAG &DAG) const {
SDLoc DL(Op);
EVT VT = Op.getValueType();
SDValue Arg = Op.getOperand(0);
SDValue TrigVal;

// Propagate fast-math flags so that the multiply we introduce can be folded
// if Arg is already the result of a multiply by constant.
auto Flags = Op->getFlags();

SDValue OneOver2Pi = DAG.getConstantFP(0.5 * numbers::inv_pi, DL, VT);

if (Subtarget->hasTrigReducedRange()) {
  SDValue MulVal = DAG.getNode(ISD::FMUL, DL, VT, Arg, OneOver2Pi, Flags);
  TrigVal = DAG.getNode(AMDGPUISD::FRACT, DL, VT, MulVal, Flags);
} else {
  TrigVal = DAG.getNode(ISD::FMUL, DL, VT, Arg, OneOver2Pi, Flags);
}

switch (Op.getOpcode()) {
case ISD::FCOS:
  return DAG.getNode(AMDGPUISD::COS_HW, SDLoc(Op), VT, TrigVal, Flags);
case ISD::FSIN:
  return DAG.getNode(AMDGPUISD::SIN_HW, SDLoc(Op), VT, TrigVal, Flags);
default:
  llvm_unreachable("Wrong trig opcode")__builtin_unreachable();
}
8774}

8776SDValue SITargetLowering::LowerATOMIC_CMP_SWAP(SDValue Op, SelectionDAG &DAG) const {
AtomicSDNode *AtomicNode = cast<AtomicSDNode>(Op);
assert(AtomicNode->isCompareAndSwap())((void)0);
unsigned AS = AtomicNode->getAddressSpace();

// No custom lowering required for local address space
if (!AMDGPU::isFlatGlobalAddrSpace(AS))
  return Op;

// Non-local address space requires custom lowering for atomic compare
// and swap; cmp and swap should be in a v2i32 or v2i64 in case of _X2
SDLoc DL(Op);
SDValue ChainIn = Op.getOperand(0);
SDValue Addr = Op.getOperand(1);
SDValue Old = Op.getOperand(2);
SDValue New = Op.getOperand(3);
EVT VT = Op.getValueType();
MVT SimpleVT = VT.getSimpleVT();
MVT VecType = MVT::getVectorVT(SimpleVT, 2);

SDValue NewOld = DAG.getBuildVector(VecType, DL, {New, Old});
SDValue Ops[] = { ChainIn, Addr, NewOld };

return DAG.getMemIntrinsicNode(AMDGPUISD::ATOMIC_CMP_SWAP, DL, Op->getVTList(),
                               Ops, VT, AtomicNode->getMemOperand());
8801}

8803//===----------------------------------------------------------------------===//
8804// Custom DAG optimizations
8805//===----------------------------------------------------------------------===//

8807SDValue SITargetLowering::performUCharToFloatCombine(SDNode *N,
                                                   DAGCombinerInfo &DCI) const {
EVT VT = N->getValueType(0);
EVT ScalarVT = VT.getScalarType();
if (ScalarVT != MVT::f32 && ScalarVT != MVT::f16)
  return SDValue();

SelectionDAG &DAG = DCI.DAG;
SDLoc DL(N);

SDValue Src = N->getOperand(0);
EVT SrcVT = Src.getValueType();

// TODO: We could try to match extracting the higher bytes, which would be
// easier if i8 vectors weren't promoted to i32 vectors, particularly after
// types are legalized. v4i8 -> v4f32 is probably the only case to worry
// about in practice.
if (DCI.isAfterLegalizeDAG() && SrcVT == MVT::i32) {
  if (DAG.MaskedValueIsZero(Src, APInt::getHighBitsSet(32, 24))) {
    SDValue Cvt = DAG.getNode(AMDGPUISD::CVT_F32_UBYTE0, DL, MVT::f32, Src);
    DCI.AddToWorklist(Cvt.getNode());

    // For the f16 case, fold to a cast to f32 and then cast back to f16.
    if (ScalarVT != MVT::f32) {
      Cvt = DAG.getNode(ISD::FP_ROUND, DL, VT, Cvt,
                        DAG.getTargetConstant(0, DL, MVT::i32));
    }
    return Cvt;
  }
}

return SDValue();
8839}

8841// (shl (add x, c1), c2) -> add (shl x, c2), (shl c1, c2)

8843// This is a variant of
8844// (mul (add x, c1), c2) -> add (mul x, c2), (mul c1, c2),
8845//
8846// The normal DAG combiner will do this, but only if the add has one use since
8847// that would increase the number of instructions.
8848//
8849// This prevents us from seeing a constant offset that can be folded into a
8850// memory instruction's addressing mode. If we know the resulting add offset of
8851// a pointer can be folded into an addressing offset, we can replace the pointer
8852// operand with the add of new constant offset. This eliminates one of the uses,
8853// and may allow the remaining use to also be simplified.
8854//
8855SDValue SITargetLowering::performSHLPtrCombine(SDNode *N,
                                             unsigned AddrSpace,
                                             EVT MemVT,
                                             DAGCombinerInfo &DCI) const {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);

// We only do this to handle cases where it's profitable when there are
// multiple uses of the add, so defer to the standard combine.
if ((N0.getOpcode() != ISD::ADD && N0.getOpcode() != ISD::OR) ||
    N0->hasOneUse())
  return SDValue();

const ConstantSDNode *CN1 = dyn_cast<ConstantSDNode>(N1);
if (!CN1)
  return SDValue();

const ConstantSDNode *CAdd = dyn_cast<ConstantSDNode>(N0.getOperand(1));
if (!CAdd)
  return SDValue();

// If the resulting offset is too large, we can't fold it into the addressing
// mode offset.
APInt Offset = CAdd->getAPIntValue() << CN1->getAPIntValue();
Type *Ty = MemVT.getTypeForEVT(*DCI.DAG.getContext());

AddrMode AM;
AM.HasBaseReg = true;
AM.BaseOffs = Offset.getSExtValue();
if (!isLegalAddressingMode(DCI.DAG.getDataLayout(), AM, Ty, AddrSpace))
  return SDValue();

SelectionDAG &DAG = DCI.DAG;
SDLoc SL(N);
EVT VT = N->getValueType(0);

SDValue ShlX = DAG.getNode(ISD::SHL, SL, VT, N0.getOperand(0), N1);
SDValue COffset = DAG.getConstant(Offset, SL, VT);

SDNodeFlags Flags;
Flags.setNoUnsignedWrap(N->getFlags().hasNoUnsignedWrap() &&
                        (N0.getOpcode() == ISD::OR ||
                         N0->getFlags().hasNoUnsignedWrap()));

return DAG.getNode(ISD::ADD, SL, VT, ShlX, COffset, Flags);
8900}

8902/// MemSDNode::getBasePtr() does not work for intrinsics, which needs to offset
8903/// by the chain and intrinsic ID. Theoretically we would also need to check the
8904/// specific intrinsic, but they all place the pointer operand first.
8905static unsigned getBasePtrIndex(const MemSDNode *N) {
switch (N->getOpcode()) {
case ISD::STORE:
case ISD::INTRINSIC_W_CHAIN:
case ISD::INTRINSIC_VOID:
  return 2;
default:
  return 1;
}
8914}

8916SDValue SITargetLowering::performMemSDNodeCombine(MemSDNode *N,
                                                DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
SDLoc SL(N);

unsigned PtrIdx = getBasePtrIndex(N);
SDValue Ptr = N->getOperand(PtrIdx);

// TODO: We could also do this for multiplies.
if (Ptr.getOpcode() == ISD::SHL) {
  SDValue NewPtr = performSHLPtrCombine(Ptr.getNode(),  N->getAddressSpace(),
                                        N->getMemoryVT(), DCI);
  if (NewPtr) {
    SmallVector<SDValue, 8> NewOps(N->op_begin(), N->op_end());

    NewOps[PtrIdx] = NewPtr;
    return SDValue(DAG.UpdateNodeOperands(N, NewOps), 0);
  }
}

return SDValue();
8937}

8939static bool bitOpWithConstantIsReducible(unsigned Opc, uint32_t Val) {
return (Opc == ISD::AND && (Val == 0 || Val == 0xffffffff)) ||
       (Opc == ISD::OR && (Val == 0xffffffff || Val == 0)) ||
       (Opc == ISD::XOR && Val == 0);
8943}

8945// Break up 64-bit bit operation of a constant into two 32-bit and/or/xor. This
8946// will typically happen anyway for a VALU 64-bit and. This exposes other 32-bit
8947// integer combine opportunities since most 64-bit operations are decomposed
8948// this way.  TODO: We won't want this for SALU especially if it is an inline
8949// immediate.
8950SDValue SITargetLowering::splitBinaryBitConstantOp(
DAGCombinerInfo &DCI,
const SDLoc &SL,
unsigned Opc, SDValue LHS,
const ConstantSDNode *CRHS) const {
uint64_t Val = CRHS->getZExtValue();
uint32_t ValLo = Lo_32(Val);
uint32_t ValHi = Hi_32(Val);
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();

  if ((bitOpWithConstantIsReducible(Opc, ValLo) ||
       bitOpWithConstantIsReducible(Opc, ValHi)) ||
      (CRHS->hasOneUse() && !TII->isInlineConstant(CRHS->getAPIntValue()))) {
  // If we need to materialize a 64-bit immediate, it will be split up later
  // anyway. Avoid creating the harder to understand 64-bit immediate
  // materialization.
  return splitBinaryBitConstantOpImpl(DCI, SL, Opc, LHS, ValLo, ValHi);
}

return SDValue();
8970}

8972// Returns true if argument is a boolean value which is not serialized into
8973// memory or argument and does not require v_cndmask_b32 to be deserialized.
8974static bool isBoolSGPR(SDValue V) {
if (V.getValueType() != MVT::i1)
  return false;
switch (V.getOpcode()) {
default:
  break;
case ISD::SETCC:
case AMDGPUISD::FP_CLASS:
  return true;
case ISD::AND:
case ISD::OR:
case ISD::XOR:
  return isBoolSGPR(V.getOperand(0)) && isBoolSGPR(V.getOperand(1));
}
return false;
8989}

8991// If a constant has all zeroes or all ones within each byte return it.
8992// Otherwise return 0.
8993static uint32_t getConstantPermuteMask(uint32_t C) {
// 0xff for any zero byte in the mask
uint32_t ZeroByteMask = 0;
if (!(C & 0x000000ff)) ZeroByteMask |= 0x000000ff;
if (!(C & 0x0000ff00)) ZeroByteMask |= 0x0000ff00;
if (!(C & 0x00ff0000)) ZeroByteMask |= 0x00ff0000;
if (!(C & 0xff000000)) ZeroByteMask |= 0xff000000;
uint32_t NonZeroByteMask = ~ZeroByteMask; // 0xff for any non-zero byte
if ((NonZeroByteMask & C) != NonZeroByteMask)
  return 0; // Partial bytes selected.
return C;
9004}

9006// Check if a node selects whole bytes from its operand 0 starting at a byte
9007// boundary while masking the rest. Returns select mask as in the v_perm_b32
9008// or -1 if not succeeded.
9009// Note byte select encoding:
9010// value 0-3 selects corresponding source byte;
9011// value 0xc selects zero;
9012// value 0xff selects 0xff.
9013static uint32_t getPermuteMask(SelectionDAG &DAG, SDValue V) {
assert(V.getValueSizeInBits() == 32)((void)0);

if (V.getNumOperands() != 2)
  return ~0;

ConstantSDNode *N1 = dyn_cast<ConstantSDNode>(V.getOperand(1));
if (!N1)
  return ~0;

uint32_t C = N1->getZExtValue();

switch (V.getOpcode()) {
default:
  break;
case ISD::AND:
  if (uint32_t ConstMask = getConstantPermuteMask(C)) {
    return (0x03020100 & ConstMask) | (0x0c0c0c0c & ~ConstMask);
  }
  break;

case ISD::OR:
  if (uint32_t ConstMask = getConstantPermuteMask(C)) {
    return (0x03020100 & ~ConstMask) | ConstMask;
  }
  break;

case ISD::SHL:
  if (C % 8)
    return ~0;

  return uint32_t((0x030201000c0c0c0cull << C) >> 32);

case ISD::SRL:
  if (C % 8)
    return ~0;

  return uint32_t(0x0c0c0c0c03020100ull >> C);
}

return ~0;
9054}

9056SDValue SITargetLowering::performAndCombine(SDNode *N,
                                          DAGCombinerInfo &DCI) const {
if (DCI.isBeforeLegalize())
5
←
Taking false branch→
  return SDValue();

SelectionDAG &DAG = DCI.DAG;
EVT VT = N->getValueType(0);
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
6
←
Value assigned to 'RHS.Node'→


const ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(RHS);
7
←
Calling 'dyn_cast<llvm::ConstantSDNode, llvm::SDValue>'→
20
←
Returning from 'dyn_cast<llvm::ConstantSDNode, llvm::SDValue>'→
if (VT == MVT::i64 && CRHS) {
21
←
Taking false branch→
  if (SDValue Split
      = splitBinaryBitConstantOp(DCI, SDLoc(N), ISD::AND, LHS, CRHS))
    return Split;
}

if (CRHS && VT == MVT::i32) {
22
←
Assuming 'CRHS' is null→
23
←
Taking false branch→
  // and (srl x, c), mask => shl (bfe x, nb + c, mask >> nb), nb
  // nb = number of trailing zeroes in mask
  // It can be optimized out using SDWA for GFX8+ in the SDWA peephole pass,
  // given that we are selecting 8 or 16 bit fields starting at byte boundary.
  uint64_t Mask = CRHS->getZExtValue();
  unsigned Bits = countPopulation(Mask);
  if (getSubtarget()->hasSDWA() && LHS->getOpcode() == ISD::SRL &&
      (Bits == 8 || Bits == 16) && isShiftedMask_64(Mask) && !(Mask & 1)) {
    if (auto *CShift = dyn_cast<ConstantSDNode>(LHS->getOperand(1))) {
      unsigned Shift = CShift->getZExtValue();
      unsigned NB = CRHS->getAPIntValue().countTrailingZeros();
      unsigned Offset = NB + Shift;
      if ((Offset & (Bits - 1)) == 0) { // Starts at a byte or word boundary.
        SDLoc SL(N);
        SDValue BFE = DAG.getNode(AMDGPUISD::BFE_U32, SL, MVT::i32,
                                  LHS->getOperand(0),
                                  DAG.getConstant(Offset, SL, MVT::i32),
                                  DAG.getConstant(Bits, SL, MVT::i32));
        EVT NarrowVT = EVT::getIntegerVT(*DAG.getContext(), Bits);
        SDValue Ext = DAG.getNode(ISD::AssertZext, SL, VT, BFE,
                                  DAG.getValueType(NarrowVT));
        SDValue Shl = DAG.getNode(ISD::SHL, SDLoc(LHS), VT, Ext,
                                  DAG.getConstant(NB, SDLoc(CRHS), MVT::i32));
        return Shl;
      }
    }
  }

  // and (perm x, y, c1), c2 -> perm x, y, permute_mask(c1, c2)
  if (LHS.hasOneUse() && LHS.getOpcode() == AMDGPUISD::PERM &&
      isa<ConstantSDNode>(LHS.getOperand(2))) {
    uint32_t Sel = getConstantPermuteMask(Mask);
    if (!Sel)
      return SDValue();

    // Select 0xc for all zero bytes
    Sel = (LHS.getConstantOperandVal(2) & Sel) | (~Sel & 0x0c0c0c0c);
    SDLoc DL(N);
    return DAG.getNode(AMDGPUISD::PERM, DL, MVT::i32, LHS.getOperand(0),
                       LHS.getOperand(1), DAG.getConstant(Sel, DL, MVT::i32));
  }
}

// (and (fcmp ord x, x), (fcmp une (fabs x), inf)) ->
// fp_class x, ~(s_nan | q_nan | n_infinity | p_infinity)
if (LHS.getOpcode() == ISD::SETCC && RHS.getOpcode() == ISD::SETCC) {
24
←
Assuming the condition is true→
25
←
Calling 'SDValue::getOpcode'→
  ISD::CondCode LCC = cast<CondCodeSDNode>(LHS.getOperand(2))->get();
  ISD::CondCode RCC = cast<CondCodeSDNode>(RHS.getOperand(2))->get();

  SDValue X = LHS.getOperand(0);
  SDValue Y = RHS.getOperand(0);
  if (Y.getOpcode() != ISD::FABS || Y.getOperand(0) != X)
    return SDValue();

  if (LCC == ISD::SETO) {
    if (X != LHS.getOperand(1))
      return SDValue();

    if (RCC == ISD::SETUNE) {
      const ConstantFPSDNode *C1 = dyn_cast<ConstantFPSDNode>(RHS.getOperand(1));
      if (!C1 || !C1->isInfinity() || C1->isNegative())
        return SDValue();

      const uint32_t Mask = SIInstrFlags::N_NORMAL |
                            SIInstrFlags::N_SUBNORMAL |
                            SIInstrFlags::N_ZERO |
                            SIInstrFlags::P_ZERO |
                            SIInstrFlags::P_SUBNORMAL |
                            SIInstrFlags::P_NORMAL;

      static_assert(((~(SIInstrFlags::S_NAN |
                        SIInstrFlags::Q_NAN |
                        SIInstrFlags::N_INFINITY |
                        SIInstrFlags::P_INFINITY)) & 0x3ff) == Mask,
                    "mask not equal");

      SDLoc DL(N);
      return DAG.getNode(AMDGPUISD::FP_CLASS, DL, MVT::i1,
                         X, DAG.getConstant(Mask, DL, MVT::i32));
    }
  }
}

if (RHS.getOpcode() == ISD::SETCC && LHS.getOpcode() == AMDGPUISD::FP_CLASS)
  std::swap(LHS, RHS);

if (LHS.getOpcode() == ISD::SETCC && RHS.getOpcode() == AMDGPUISD::FP_CLASS &&
    RHS.hasOneUse()) {
  ISD::CondCode LCC = cast<CondCodeSDNode>(LHS.getOperand(2))->get();
  // and (fcmp seto), (fp_class x, mask) -> fp_class x, mask & ~(p_nan | n_nan)
  // and (fcmp setuo), (fp_class x, mask) -> fp_class x, mask & (p_nan | n_nan)
  const ConstantSDNode *Mask = dyn_cast<ConstantSDNode>(RHS.getOperand(1));
  if ((LCC == ISD::SETO || LCC == ISD::SETUO) && Mask &&
      (RHS.getOperand(0) == LHS.getOperand(0) &&
       LHS.getOperand(0) == LHS.getOperand(1))) {
    const unsigned OrdMask = SIInstrFlags::S_NAN | SIInstrFlags::Q_NAN;
    unsigned NewMask = LCC == ISD::SETO ?
      Mask->getZExtValue() & ~OrdMask :
      Mask->getZExtValue() & OrdMask;

    SDLoc DL(N);
    return DAG.getNode(AMDGPUISD::FP_CLASS, DL, MVT::i1, RHS.getOperand(0),
                       DAG.getConstant(NewMask, DL, MVT::i32));
  }
}

if (VT == MVT::i32 &&
    (RHS.getOpcode() == ISD::SIGN_EXTEND || LHS.getOpcode() == ISD::SIGN_EXTEND)) {
  // and x, (sext cc from i1) => select cc, x, 0
  if (RHS.getOpcode() != ISD::SIGN_EXTEND)
    std::swap(LHS, RHS);
  if (isBoolSGPR(RHS.getOperand(0)))
    return DAG.getSelect(SDLoc(N), MVT::i32, RHS.getOperand(0),
                         LHS, DAG.getConstant(0, SDLoc(N), MVT::i32));
}

// and (op x, c1), (op y, c2) -> perm x, y, permute_mask(c1, c2)
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
if (VT == MVT::i32 && LHS.hasOneUse() && RHS.hasOneUse() &&
    N->isDivergent() && TII->pseudoToMCOpcode(AMDGPU::V_PERM_B32_e64) != -1) {
  uint32_t LHSMask = getPermuteMask(DAG, LHS);
  uint32_t RHSMask = getPermuteMask(DAG, RHS);
  if (LHSMask != ~0u && RHSMask != ~0u) {
    // Canonicalize the expression in an attempt to have fewer unique masks
    // and therefore fewer registers used to hold the masks.
    if (LHSMask > RHSMask) {
      std::swap(LHSMask, RHSMask);
      std::swap(LHS, RHS);
    }

    // Select 0xc for each lane used from source operand. Zero has 0xc mask
    // set, 0xff have 0xff in the mask, actual lanes are in the 0-3 range.
    uint32_t LHSUsedLanes = ~(LHSMask & 0x0c0c0c0c) & 0x0c0c0c0c;
    uint32_t RHSUsedLanes = ~(RHSMask & 0x0c0c0c0c) & 0x0c0c0c0c;

    // Check of we need to combine values from two sources within a byte.
    if (!(LHSUsedLanes & RHSUsedLanes) &&
        // If we select high and lower word keep it for SDWA.
        // TODO: teach SDWA to work with v_perm_b32 and remove the check.
        !(LHSUsedLanes == 0x0c0c0000 && RHSUsedLanes == 0x00000c0c)) {
      // Each byte in each mask is either selector mask 0-3, or has higher
      // bits set in either of masks, which can be 0xff for 0xff or 0x0c for
      // zero. If 0x0c is in either mask it shall always be 0x0c. Otherwise
      // mask which is not 0xff wins. By anding both masks we have a correct
      // result except that 0x0c shall be corrected to give 0x0c only.
      uint32_t Mask = LHSMask & RHSMask;
      for (unsigned I = 0; I < 32; I += 8) {
        uint32_t ByteSel = 0xff << I;
        if ((LHSMask & ByteSel) == 0x0c || (RHSMask & ByteSel) == 0x0c)
          Mask &= (0x0c << I) & 0xffffffff;
      }

      // Add 4 to each active LHS lane. It will not affect any existing 0xff
      // or 0x0c.
      uint32_t Sel = Mask | (LHSUsedLanes & 0x04040404);
      SDLoc DL(N);

      return DAG.getNode(AMDGPUISD::PERM, DL, MVT::i32,
                         LHS.getOperand(0), RHS.getOperand(0),
                         DAG.getConstant(Sel, DL, MVT::i32));
    }
  }
}

return SDValue();
9240}

9242SDValue SITargetLowering::performOrCombine(SDNode *N,
                                         DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);

EVT VT = N->getValueType(0);
if (VT == MVT::i1) {
  // or (fp_class x, c1), (fp_class x, c2) -> fp_class x, (c1 | c2)
  if (LHS.getOpcode() == AMDGPUISD::FP_CLASS &&
      RHS.getOpcode() == AMDGPUISD::FP_CLASS) {
    SDValue Src = LHS.getOperand(0);
    if (Src != RHS.getOperand(0))
      return SDValue();

    const ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(LHS.getOperand(1));
    const ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(RHS.getOperand(1));
    if (!CLHS || !CRHS)
      return SDValue();

    // Only 10 bits are used.
    static const uint32_t MaxMask = 0x3ff;

    uint32_t NewMask = (CLHS->getZExtValue() | CRHS->getZExtValue()) & MaxMask;
    SDLoc DL(N);
    return DAG.getNode(AMDGPUISD::FP_CLASS, DL, MVT::i1,
                       Src, DAG.getConstant(NewMask, DL, MVT::i32));
  }

  return SDValue();
}

// or (perm x, y, c1), c2 -> perm x, y, permute_mask(c1, c2)
if (isa<ConstantSDNode>(RHS) && LHS.hasOneUse() &&
    LHS.getOpcode() == AMDGPUISD::PERM &&
    isa<ConstantSDNode>(LHS.getOperand(2))) {
  uint32_t Sel = getConstantPermuteMask(N->getConstantOperandVal(1));
  if (!Sel)
    return SDValue();

  Sel |= LHS.getConstantOperandVal(2);
  SDLoc DL(N);
  return DAG.getNode(AMDGPUISD::PERM, DL, MVT::i32, LHS.getOperand(0),
                     LHS.getOperand(1), DAG.getConstant(Sel, DL, MVT::i32));
}

// or (op x, c1), (op y, c2) -> perm x, y, permute_mask(c1, c2)
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
if (VT == MVT::i32 && LHS.hasOneUse() && RHS.hasOneUse() &&
    N->isDivergent() && TII->pseudoToMCOpcode(AMDGPU::V_PERM_B32_e64) != -1) {
  uint32_t LHSMask = getPermuteMask(DAG, LHS);
  uint32_t RHSMask = getPermuteMask(DAG, RHS);
  if (LHSMask != ~0u && RHSMask != ~0u) {
    // Canonicalize the expression in an attempt to have fewer unique masks
    // and therefore fewer registers used to hold the masks.
    if (LHSMask > RHSMask) {
      std::swap(LHSMask, RHSMask);
      std::swap(LHS, RHS);
    }

    // Select 0xc for each lane used from source operand. Zero has 0xc mask
    // set, 0xff have 0xff in the mask, actual lanes are in the 0-3 range.
    uint32_t LHSUsedLanes = ~(LHSMask & 0x0c0c0c0c) & 0x0c0c0c0c;
    uint32_t RHSUsedLanes = ~(RHSMask & 0x0c0c0c0c) & 0x0c0c0c0c;

    // Check of we need to combine values from two sources within a byte.
    if (!(LHSUsedLanes & RHSUsedLanes) &&
        // If we select high and lower word keep it for SDWA.
        // TODO: teach SDWA to work with v_perm_b32 and remove the check.
        !(LHSUsedLanes == 0x0c0c0000 && RHSUsedLanes == 0x00000c0c)) {
      // Kill zero bytes selected by other mask. Zero value is 0xc.
      LHSMask &= ~RHSUsedLanes;
      RHSMask &= ~LHSUsedLanes;
      // Add 4 to each active LHS lane
      LHSMask |= LHSUsedLanes & 0x04040404;
      // Combine masks
      uint32_t Sel = LHSMask | RHSMask;
      SDLoc DL(N);

      return DAG.getNode(AMDGPUISD::PERM, DL, MVT::i32,
                         LHS.getOperand(0), RHS.getOperand(0),
                         DAG.getConstant(Sel, DL, MVT::i32));
    }
  }
}

if (VT != MVT::i64 || DCI.isBeforeLegalizeOps())
  return SDValue();

// TODO: This could be a generic combine with a predicate for extracting the
// high half of an integer being free.

// (or i64:x, (zero_extend i32:y)) ->
//   i64 (bitcast (v2i32 build_vector (or i32:y, lo_32(x)), hi_32(x)))
if (LHS.getOpcode() == ISD::ZERO_EXTEND &&
    RHS.getOpcode() != ISD::ZERO_EXTEND)
  std::swap(LHS, RHS);

if (RHS.getOpcode() == ISD::ZERO_EXTEND) {
  SDValue ExtSrc = RHS.getOperand(0);
  EVT SrcVT = ExtSrc.getValueType();
  if (SrcVT == MVT::i32) {
    SDLoc SL(N);
    SDValue LowLHS, HiBits;
    std::tie(LowLHS, HiBits) = split64BitValue(LHS, DAG);
    SDValue LowOr = DAG.getNode(ISD::OR, SL, MVT::i32, LowLHS, ExtSrc);

    DCI.AddToWorklist(LowOr.getNode());
    DCI.AddToWorklist(HiBits.getNode());

    SDValue Vec = DAG.getNode(ISD::BUILD_VECTOR, SL, MVT::v2i32,
                              LowOr, HiBits);
    return DAG.getNode(ISD::BITCAST, SL, MVT::i64, Vec);
  }
}

const ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(N->getOperand(1));
if (CRHS) {
  if (SDValue Split
        = splitBinaryBitConstantOp(DCI, SDLoc(N), ISD::OR, LHS, CRHS))
    return Split;
}

return SDValue();
9366}

9368SDValue SITargetLowering::performXorCombine(SDNode *N,
                                          DAGCombinerInfo &DCI) const {
EVT VT = N->getValueType(0);
if (VT != MVT::i64)
  return SDValue();

SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);

const ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(RHS);
if (CRHS) {
  if (SDValue Split
        = splitBinaryBitConstantOp(DCI, SDLoc(N), ISD::XOR, LHS, CRHS))
    return Split;
}

return SDValue();
9385}

9387SDValue SITargetLowering::performZeroExtendCombine(SDNode *N,
                                                 DAGCombinerInfo &DCI) const {
if (!Subtarget->has16BitInsts() ||
    DCI.getDAGCombineLevel() < AfterLegalizeDAG)
  return SDValue();

EVT VT = N->getValueType(0);
if (VT != MVT::i32)
  return SDValue();

SDValue Src = N->getOperand(0);
if (Src.getValueType() != MVT::i16)
  return SDValue();

return SDValue();
9402}

9404SDValue SITargetLowering::performSignExtendInRegCombine(SDNode *N,
                                                      DAGCombinerInfo &DCI)
                                                      const {
SDValue Src = N->getOperand(0);
auto *VTSign = cast<VTSDNode>(N->getOperand(1));

if (((Src.getOpcode() == AMDGPUISD::BUFFER_LOAD_UBYTE &&
    VTSign->getVT() == MVT::i8) ||
    (Src.getOpcode() == AMDGPUISD::BUFFER_LOAD_USHORT &&
    VTSign->getVT() == MVT::i16)) &&
    Src.hasOneUse()) {
  auto *M = cast<MemSDNode>(Src);
  SDValue Ops[] = {
    Src.getOperand(0), // Chain
    Src.getOperand(1), // rsrc
    Src.getOperand(2), // vindex
    Src.getOperand(3), // voffset
    Src.getOperand(4), // soffset
    Src.getOperand(5), // offset
    Src.getOperand(6),
    Src.getOperand(7)
  };
  // replace with BUFFER_LOAD_BYTE/SHORT
  SDVTList ResList = DCI.DAG.getVTList(MVT::i32,
                                       Src.getOperand(0).getValueType());
  unsigned Opc = (Src.getOpcode() == AMDGPUISD::BUFFER_LOAD_UBYTE) ?
                 AMDGPUISD::BUFFER_LOAD_BYTE : AMDGPUISD::BUFFER_LOAD_SHORT;
  SDValue BufferLoadSignExt = DCI.DAG.getMemIntrinsicNode(Opc, SDLoc(N),
                                                        ResList,
                                                        Ops, M->getMemoryVT(),
                                                        M->getMemOperand());
  return DCI.DAG.getMergeValues({BufferLoadSignExt,
                                BufferLoadSignExt.getValue(1)}, SDLoc(N));
}
return SDValue();
9439}

9441SDValue SITargetLowering::performClassCombine(SDNode *N,
                                            DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
SDValue Mask = N->getOperand(1);

// fp_class x, 0 -> false
if (const ConstantSDNode *CMask = dyn_cast<ConstantSDNode>(Mask)) {
  if (CMask->isNullValue())
    return DAG.getConstant(0, SDLoc(N), MVT::i1);
}

if (N->getOperand(0).isUndef())
  return DAG.getUNDEF(MVT::i1);

return SDValue();
9456}

9458SDValue SITargetLowering::performRcpCombine(SDNode *N,
                                          DAGCombinerInfo &DCI) const {
EVT VT = N->getValueType(0);
SDValue N0 = N->getOperand(0);

if (N0.isUndef())
  return N0;

if (VT == MVT::f32 && (N0.getOpcode() == ISD::UINT_TO_FP ||
                       N0.getOpcode() == ISD::SINT_TO_FP)) {
  return DCI.DAG.getNode(AMDGPUISD::RCP_IFLAG, SDLoc(N), VT, N0,
                         N->getFlags());
}

if ((VT == MVT::f32 || VT == MVT::f16) && N0.getOpcode() == ISD::FSQRT) {
  return DCI.DAG.getNode(AMDGPUISD::RSQ, SDLoc(N), VT,
                         N0.getOperand(0), N->getFlags());
}

return AMDGPUTargetLowering::performRcpCombine(N, DCI);
9478}

9480bool SITargetLowering::isCanonicalized(SelectionDAG &DAG, SDValue Op,
                                     unsigned MaxDepth) const {
unsigned Opcode = Op.getOpcode();
if (Opcode == ISD::FCANONICALIZE)
  return true;

if (auto *CFP = dyn_cast<ConstantFPSDNode>(Op)) {
  auto F = CFP->getValueAPF();
  if (F.isNaN() && F.isSignaling())
    return false;
  return !F.isDenormal() || denormalsEnabledForType(DAG, Op.getValueType());
}

// If source is a result of another standard FP operation it is already in
// canonical form.
if (MaxDepth == 0)
  return false;

switch (Opcode) {
// These will flush denorms if required.
case ISD::FADD:
case ISD::FSUB:
case ISD::FMUL:
case ISD::FCEIL:
case ISD::FFLOOR:
case ISD::FMA:
case ISD::FMAD:
case ISD::FSQRT:
case ISD::FDIV:
case ISD::FREM:
case ISD::FP_ROUND:
case ISD::FP_EXTEND:
case AMDGPUISD::FMUL_LEGACY:
case AMDGPUISD::FMAD_FTZ:
case AMDGPUISD::RCP:
case AMDGPUISD::RSQ:
case AMDGPUISD::RSQ_CLAMP:
case AMDGPUISD::RCP_LEGACY:
case AMDGPUISD::RCP_IFLAG:
case AMDGPUISD::DIV_SCALE:
case AMDGPUISD::DIV_FMAS:
case AMDGPUISD::DIV_FIXUP:
case AMDGPUISD::FRACT:
case AMDGPUISD::LDEXP:
case AMDGPUISD::CVT_PKRTZ_F16_F32:
case AMDGPUISD::CVT_F32_UBYTE0:
case AMDGPUISD::CVT_F32_UBYTE1:
case AMDGPUISD::CVT_F32_UBYTE2:
case AMDGPUISD::CVT_F32_UBYTE3:
  return true;

// It can/will be lowered or combined as a bit operation.
// Need to check their input recursively to handle.
case ISD::FNEG:
case ISD::FABS:
case ISD::FCOPYSIGN:
  return isCanonicalized(DAG, Op.getOperand(0), MaxDepth - 1);

case ISD::FSIN:
case ISD::FCOS:
case ISD::FSINCOS:
  return Op.getValueType().getScalarType() != MVT::f16;

case ISD::FMINNUM:
case ISD::FMAXNUM:
case ISD::FMINNUM_IEEE:
case ISD::FMAXNUM_IEEE:
case AMDGPUISD::CLAMP:
case AMDGPUISD::FMED3:
case AMDGPUISD::FMAX3:
case AMDGPUISD::FMIN3: {
  // FIXME: Shouldn't treat the generic operations different based these.
  // However, we aren't really required to flush the result from
  // minnum/maxnum..

  // snans will be quieted, so we only need to worry about denormals.
  if (Subtarget->supportsMinMaxDenormModes() ||
      denormalsEnabledForType(DAG, Op.getValueType()))
    return true;

  // Flushing may be required.
  // In pre-GFX9 targets V_MIN_F32 and others do not flush denorms. For such
  // targets need to check their input recursively.

  // FIXME: Does this apply with clamp? It's implemented with max.
  for (unsigned I = 0, E = Op.getNumOperands(); I != E; ++I) {
    if (!isCanonicalized(DAG, Op.getOperand(I), MaxDepth - 1))
      return false;
  }

  return true;
}
case ISD::SELECT: {
  return isCanonicalized(DAG, Op.getOperand(1), MaxDepth - 1) &&
         isCanonicalized(DAG, Op.getOperand(2), MaxDepth - 1);
}
case ISD::BUILD_VECTOR: {
  for (unsigned i = 0, e = Op.getNumOperands(); i != e; ++i) {
    SDValue SrcOp = Op.getOperand(i);
    if (!isCanonicalized(DAG, SrcOp, MaxDepth - 1))
      return false;
  }

  return true;
}
case ISD::EXTRACT_VECTOR_ELT:
case ISD::EXTRACT_SUBVECTOR: {
  return isCanonicalized(DAG, Op.getOperand(0), MaxDepth - 1);
}
case ISD::INSERT_VECTOR_ELT: {
  return isCanonicalized(DAG, Op.getOperand(0), MaxDepth - 1) &&
         isCanonicalized(DAG, Op.getOperand(1), MaxDepth - 1);
}
case ISD::UNDEF:
  // Could be anything.
  return false;

case ISD::BITCAST:
  return isCanonicalized(DAG, Op.getOperand(0), MaxDepth - 1);
case ISD::TRUNCATE: {
  // Hack round the mess we make when legalizing extract_vector_elt
  if (Op.getValueType() == MVT::i16) {
    SDValue TruncSrc = Op.getOperand(0);
    if (TruncSrc.getValueType() == MVT::i32 &&
        TruncSrc.getOpcode() == ISD::BITCAST &&
        TruncSrc.getOperand(0).getValueType() == MVT::v2f16) {
      return isCanonicalized(DAG, TruncSrc.getOperand(0), MaxDepth - 1);
    }
  }
  return false;
}
case ISD::INTRINSIC_WO_CHAIN: {
  unsigned IntrinsicID
    = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
  // TODO: Handle more intrinsics
  switch (IntrinsicID) {
  case Intrinsic::amdgcn_cvt_pkrtz:
  case Intrinsic::amdgcn_cubeid:
  case Intrinsic::amdgcn_frexp_mant:
  case Intrinsic::amdgcn_fdot2:
  case Intrinsic::amdgcn_rcp:
  case Intrinsic::amdgcn_rsq:
  case Intrinsic::amdgcn_rsq_clamp:
  case Intrinsic::amdgcn_rcp_legacy:
  case Intrinsic::amdgcn_rsq_legacy:
  case Intrinsic::amdgcn_trig_preop:
    return true;
  default:
    break;
  }

  LLVM_FALLTHROUGH[[gnu::fallthrough]];
}
default:
  return denormalsEnabledForType(DAG, Op.getValueType()) &&
         DAG.isKnownNeverSNaN(Op);
}

llvm_unreachable("invalid operation")__builtin_unreachable();
9639}

9641bool SITargetLowering::isCanonicalized(Register Reg, MachineFunction &MF,
                                     unsigned MaxDepth) const {
MachineRegisterInfo &MRI = MF.getRegInfo();
MachineInstr *MI = MRI.getVRegDef(Reg);
unsigned Opcode = MI->getOpcode();

if (Opcode == AMDGPU::G_FCANONICALIZE)
  return true;

if (Opcode == AMDGPU::G_FCONSTANT) {
  auto F = MI->getOperand(1).getFPImm()->getValueAPF();
  if (F.isNaN() && F.isSignaling())
    return false;
  return !F.isDenormal() || denormalsEnabledForType(MRI.getType(Reg), MF);
}

if (MaxDepth == 0)
  return false;

switch (Opcode) {
case AMDGPU::G_FMINNUM_IEEE:
case AMDGPU::G_FMAXNUM_IEEE: {
  if (Subtarget->supportsMinMaxDenormModes() ||
      denormalsEnabledForType(MRI.getType(Reg), MF))
    return true;
  for (unsigned I = 1, E = MI->getNumOperands(); I != E; ++I) {
    if (!isCanonicalized(MI->getOperand(I).getReg(), MF, MaxDepth - 1))
      return false;
  }
  return true;
}
default:
  return denormalsEnabledForType(MRI.getType(Reg), MF) &&
         isKnownNeverSNaN(Reg, MRI);
}

llvm_unreachable("invalid operation")__builtin_unreachable();
9678}

9680// Constant fold canonicalize.
9681SDValue SITargetLowering::getCanonicalConstantFP(
SelectionDAG &DAG, const SDLoc &SL, EVT VT, const APFloat &C) const {
// Flush denormals to 0 if not enabled.
if (C.isDenormal() && !denormalsEnabledForType(DAG, VT))
  return DAG.getConstantFP(0.0, SL, VT);

if (C.isNaN()) {
  APFloat CanonicalQNaN = APFloat::getQNaN(C.getSemantics());
  if (C.isSignaling()) {
    // Quiet a signaling NaN.
    // FIXME: Is this supposed to preserve payload bits?
    return DAG.getConstantFP(CanonicalQNaN, SL, VT);
  }

  // Make sure it is the canonical NaN bitpattern.
  //
  // TODO: Can we use -1 as the canonical NaN value since it's an inline
  // immediate?
  if (C.bitcastToAPInt() != CanonicalQNaN.bitcastToAPInt())
    return DAG.getConstantFP(CanonicalQNaN, SL, VT);
}

// Already canonical.
return DAG.getConstantFP(C, SL, VT);
9705}

9707static bool vectorEltWillFoldAway(SDValue Op) {
return Op.isUndef() || isa<ConstantFPSDNode>(Op);
9709}

9711SDValue SITargetLowering::performFCanonicalizeCombine(
SDNode *N,
DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
SDValue N0 = N->getOperand(0);
EVT VT = N->getValueType(0);

// fcanonicalize undef -> qnan
if (N0.isUndef()) {
  APFloat QNaN = APFloat::getQNaN(SelectionDAG::EVTToAPFloatSemantics(VT));
  return DAG.getConstantFP(QNaN, SDLoc(N), VT);
}

if (ConstantFPSDNode *CFP = isConstOrConstSplatFP(N0)) {
  EVT VT = N->getValueType(0);
  return getCanonicalConstantFP(DAG, SDLoc(N), VT, CFP->getValueAPF());
}

// fcanonicalize (build_vector x, k) -> build_vector (fcanonicalize x),
//                                                   (fcanonicalize k)
//
// fcanonicalize (build_vector x, undef) -> build_vector (fcanonicalize x), 0

// TODO: This could be better with wider vectors that will be split to v2f16,
// and to consider uses since there aren't that many packed operations.
if (N0.getOpcode() == ISD::BUILD_VECTOR && VT == MVT::v2f16 &&
    isTypeLegal(MVT::v2f16)) {
  SDLoc SL(N);
  SDValue NewElts[2];
  SDValue Lo = N0.getOperand(0);
  SDValue Hi = N0.getOperand(1);
  EVT EltVT = Lo.getValueType();

  if (vectorEltWillFoldAway(Lo) || vectorEltWillFoldAway(Hi)) {
    for (unsigned I = 0; I != 2; ++I) {
      SDValue Op = N0.getOperand(I);
      if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op)) {
        NewElts[I] = getCanonicalConstantFP(DAG, SL, EltVT,
                                            CFP->getValueAPF());
      } else if (Op.isUndef()) {
        // Handled below based on what the other operand is.
        NewElts[I] = Op;
      } else {
        NewElts[I] = DAG.getNode(ISD::FCANONICALIZE, SL, EltVT, Op);
      }
    }

    // If one half is undef, and one is constant, perfer a splat vector rather
    // than the normal qNaN. If it's a register, prefer 0.0 since that's
    // cheaper to use and may be free with a packed operation.
    if (NewElts[0].isUndef()) {
      if (isa<ConstantFPSDNode>(NewElts[1]))
        NewElts[0] = isa<ConstantFPSDNode>(NewElts[1]) ?
          NewElts[1]: DAG.getConstantFP(0.0f, SL, EltVT);
    }

    if (NewElts[1].isUndef()) {
      NewElts[1] = isa<ConstantFPSDNode>(NewElts[0]) ?
        NewElts[0] : DAG.getConstantFP(0.0f, SL, EltVT);
    }

    return DAG.getBuildVector(VT, SL, NewElts);
  }
}

unsigned SrcOpc = N0.getOpcode();

// If it's free to do so, push canonicalizes further up the source, which may
// find a canonical source.
//
// TODO: More opcodes. Note this is unsafe for the the _ieee minnum/maxnum for
// sNaNs.
if (SrcOpc == ISD::FMINNUM || SrcOpc == ISD::FMAXNUM) {
  auto *CRHS = dyn_cast<ConstantFPSDNode>(N0.getOperand(1));
  if (CRHS && N0.hasOneUse()) {
    SDLoc SL(N);
    SDValue Canon0 = DAG.getNode(ISD::FCANONICALIZE, SL, VT,
                                 N0.getOperand(0));
    SDValue Canon1 = getCanonicalConstantFP(DAG, SL, VT, CRHS->getValueAPF());
    DCI.AddToWorklist(Canon0.getNode());

    return DAG.getNode(N0.getOpcode(), SL, VT, Canon0, Canon1);
  }
}

return isCanonicalized(DAG, N0) ? N0 : SDValue();
9797}

9799static unsigned minMaxOpcToMin3Max3Opc(unsigned Opc) {
switch (Opc) {
case ISD::FMAXNUM:
case ISD::FMAXNUM_IEEE:
  return AMDGPUISD::FMAX3;
case ISD::SMAX:
  return AMDGPUISD::SMAX3;
case ISD::UMAX:
  return AMDGPUISD::UMAX3;
case ISD::FMINNUM:
case ISD::FMINNUM_IEEE:
  return AMDGPUISD::FMIN3;
case ISD::SMIN:
  return AMDGPUISD::SMIN3;
case ISD::UMIN:
  return AMDGPUISD::UMIN3;
default:
  llvm_unreachable("Not a min/max opcode")__builtin_unreachable();
}
9818}

9820SDValue SITargetLowering::performIntMed3ImmCombine(
SelectionDAG &DAG, const SDLoc &SL,
SDValue Op0, SDValue Op1, bool Signed) const {
ConstantSDNode *K1 = dyn_cast<ConstantSDNode>(Op1);
if (!K1)
  return SDValue();

ConstantSDNode *K0 = dyn_cast<ConstantSDNode>(Op0.getOperand(1));
if (!K0)
  return SDValue();

if (Signed) {
  if (K0->getAPIntValue().sge(K1->getAPIntValue()))
    return SDValue();
} else {
  if (K0->getAPIntValue().uge(K1->getAPIntValue()))
    return SDValue();
}

EVT VT = K0->getValueType(0);
unsigned Med3Opc = Signed ? AMDGPUISD::SMED3 : AMDGPUISD::UMED3;
if (VT == MVT::i32 || (VT == MVT::i16 && Subtarget->hasMed3_16())) {
  return DAG.getNode(Med3Opc, SL, VT,
                     Op0.getOperand(0), SDValue(K0, 0), SDValue(K1, 0));
}

// If there isn't a 16-bit med3 operation, convert to 32-bit.
if (VT == MVT::i16) {
  MVT NVT = MVT::i32;
  unsigned ExtOp = Signed ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;

  SDValue Tmp1 = DAG.getNode(ExtOp, SL, NVT, Op0->getOperand(0));
  SDValue Tmp2 = DAG.getNode(ExtOp, SL, NVT, Op0->getOperand(1));
  SDValue Tmp3 = DAG.getNode(ExtOp, SL, NVT, Op1);

  SDValue Med3 = DAG.getNode(Med3Opc, SL, NVT, Tmp1, Tmp2, Tmp3);
  return DAG.getNode(ISD::TRUNCATE, SL, VT, Med3);
}

return SDValue();
9860}

9862static ConstantFPSDNode *getSplatConstantFP(SDValue Op) {
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op))
  return C;

if (BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(Op)) {
  if (ConstantFPSDNode *C = BV->getConstantFPSplatNode())
    return C;
}

return nullptr;
9872}

9874SDValue SITargetLowering::performFPMed3ImmCombine(SelectionDAG &DAG,
                                                const SDLoc &SL,
                                                SDValue Op0,
                                                SDValue Op1) const {
ConstantFPSDNode *K1 = getSplatConstantFP(Op1);
if (!K1)
  return SDValue();

ConstantFPSDNode *K0 = getSplatConstantFP(Op0.getOperand(1));
if (!K0)
  return SDValue();

// Ordered >= (although NaN inputs should have folded away by now).
if (K0->getValueAPF() > K1->getValueAPF())
  return SDValue();

const MachineFunction &MF = DAG.getMachineFunction();
const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();

// TODO: Check IEEE bit enabled?
EVT VT = Op0.getValueType();
if (Info->getMode().DX10Clamp) {
  // If dx10_clamp is enabled, NaNs clamp to 0.0. This is the same as the
  // hardware fmed3 behavior converting to a min.
  // FIXME: Should this be allowing -0.0?
  if (K1->isExactlyValue(1.0) && K0->isExactlyValue(0.0))
    return DAG.getNode(AMDGPUISD::CLAMP, SL, VT, Op0.getOperand(0));
}

// med3 for f16 is only available on gfx9+, and not available for v2f16.
if (VT == MVT::f32 || (VT == MVT::f16 && Subtarget->hasMed3_16())) {
  // This isn't safe with signaling NaNs because in IEEE mode, min/max on a
  // signaling NaN gives a quiet NaN. The quiet NaN input to the min would
  // then give the other result, which is different from med3 with a NaN
  // input.
  SDValue Var = Op0.getOperand(0);
  if (!DAG.isKnownNeverSNaN(Var))
    return SDValue();

  const SIInstrInfo *TII = getSubtarget()->getInstrInfo();

  if ((!K0->hasOneUse() ||
       TII->isInlineConstant(K0->getValueAPF().bitcastToAPInt())) &&
      (!K1->hasOneUse() ||
       TII->isInlineConstant(K1->getValueAPF().bitcastToAPInt()))) {
    return DAG.getNode(AMDGPUISD::FMED3, SL, K0->getValueType(0),
                       Var, SDValue(K0, 0), SDValue(K1, 0));
  }
}

return SDValue();
9925}

9927SDValue SITargetLowering::performMinMaxCombine(SDNode *N,
                                             DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;

EVT VT = N->getValueType(0);
unsigned Opc = N->getOpcode();
SDValue Op0 = N->getOperand(0);
SDValue Op1 = N->getOperand(1);

// Only do this if the inner op has one use since this will just increases
// register pressure for no benefit.

if (Opc != AMDGPUISD::FMIN_LEGACY && Opc != AMDGPUISD::FMAX_LEGACY &&
    !VT.isVector() &&
    (VT == MVT::i32 || VT == MVT::f32 ||
     ((VT == MVT::f16 || VT == MVT::i16) && Subtarget->hasMin3Max3_16()))) {
  // max(max(a, b), c) -> max3(a, b, c)
  // min(min(a, b), c) -> min3(a, b, c)
  if (Op0.getOpcode() == Opc && Op0.hasOneUse()) {
    SDLoc DL(N);
    return DAG.getNode(minMaxOpcToMin3Max3Opc(Opc),
                       DL,
                       N->getValueType(0),
                       Op0.getOperand(0),
                       Op0.getOperand(1),
                       Op1);
  }

  // Try commuted.
  // max(a, max(b, c)) -> max3(a, b, c)
  // min(a, min(b, c)) -> min3(a, b, c)
  if (Op1.getOpcode() == Opc && Op1.hasOneUse()) {
    SDLoc DL(N);
    return DAG.getNode(minMaxOpcToMin3Max3Opc(Opc),
                       DL,
                       N->getValueType(0),
                       Op0,
                       Op1.getOperand(0),
                       Op1.getOperand(1));
  }
}

// min(max(x, K0), K1), K0 < K1 -> med3(x, K0, K1)
if (Opc == ISD::SMIN && Op0.getOpcode() == ISD::SMAX && Op0.hasOneUse()) {
  if (SDValue Med3 = performIntMed3ImmCombine(DAG, SDLoc(N), Op0, Op1, true))
    return Med3;
}

if (Opc == ISD::UMIN && Op0.getOpcode() == ISD::UMAX && Op0.hasOneUse()) {
  if (SDValue Med3 = performIntMed3ImmCombine(DAG, SDLoc(N), Op0, Op1, false))
    return Med3;
}

// fminnum(fmaxnum(x, K0), K1), K0 < K1 && !is_snan(x) -> fmed3(x, K0, K1)
if (((Opc == ISD::FMINNUM && Op0.getOpcode() == ISD::FMAXNUM) ||
     (Opc == ISD::FMINNUM_IEEE && Op0.getOpcode() == ISD::FMAXNUM_IEEE) ||
     (Opc == AMDGPUISD::FMIN_LEGACY &&
      Op0.getOpcode() == AMDGPUISD::FMAX_LEGACY)) &&
    (VT == MVT::f32 || VT == MVT::f64 ||
     (VT == MVT::f16 && Subtarget->has16BitInsts()) ||
     (VT == MVT::v2f16 && Subtarget->hasVOP3PInsts())) &&
    Op0.hasOneUse()) {
  if (SDValue Res = performFPMed3ImmCombine(DAG, SDLoc(N), Op0, Op1))
    return Res;
}

return SDValue();
9994}

9996static bool isClampZeroToOne(SDValue A, SDValue B) {
if (ConstantFPSDNode *CA = dyn_cast<ConstantFPSDNode>(A)) {
  if (ConstantFPSDNode *CB = dyn_cast<ConstantFPSDNode>(B)) {
    // FIXME: Should this be allowing -0.0?
    return (CA->isExactlyValue(0.0) && CB->isExactlyValue(1.0)) ||
           (CA->isExactlyValue(1.0) && CB->isExactlyValue(0.0));
  }
}

return false;
10006}

10008// FIXME: Should only worry about snans for version with chain.
10009SDValue SITargetLowering::performFMed3Combine(SDNode *N,
                                            DAGCombinerInfo &DCI) const {
EVT VT = N->getValueType(0);
// v_med3_f32 and v_max_f32 behave identically wrt denorms, exceptions and
// NaNs. With a NaN input, the order of the operands may change the result.

SelectionDAG &DAG = DCI.DAG;
SDLoc SL(N);

SDValue Src0 = N->getOperand(0);
SDValue Src1 = N->getOperand(1);
SDValue Src2 = N->getOperand(2);

if (isClampZeroToOne(Src0, Src1)) {
  // const_a, const_b, x -> clamp is safe in all cases including signaling
  // nans.
  // FIXME: Should this be allowing -0.0?
  return DAG.getNode(AMDGPUISD::CLAMP, SL, VT, Src2);
}

const MachineFunction &MF = DAG.getMachineFunction();
const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();

// FIXME: dx10_clamp behavior assumed in instcombine. Should we really bother
// handling no dx10-clamp?
if (Info->getMode().DX10Clamp) {
  // If NaNs is clamped to 0, we are free to reorder the inputs.

  if (isa<ConstantFPSDNode>(Src0) && !isa<ConstantFPSDNode>(Src1))
    std::swap(Src0, Src1);

  if (isa<ConstantFPSDNode>(Src1) && !isa<ConstantFPSDNode>(Src2))
    std::swap(Src1, Src2);

  if (isa<ConstantFPSDNode>(Src0) && !isa<ConstantFPSDNode>(Src1))
    std::swap(Src0, Src1);

  if (isClampZeroToOne(Src1, Src2))
    return DAG.getNode(AMDGPUISD::CLAMP, SL, VT, Src0);
}

return SDValue();
10051}

10053SDValue SITargetLowering::performCvtPkRTZCombine(SDNode *N,
                                               DAGCombinerInfo &DCI) const {
SDValue Src0 = N->getOperand(0);
SDValue Src1 = N->getOperand(1);
if (Src0.isUndef() && Src1.isUndef())
  return DCI.DAG.getUNDEF(N->getValueType(0));
return SDValue();
10060}

10062// Check if EXTRACT_VECTOR_ELT/INSERT_VECTOR_ELT (<n x e>, var-idx) should be
10063// expanded into a set of cmp/select instructions.
10064bool SITargetLowering::shouldExpandVectorDynExt(unsigned EltSize,
                                              unsigned NumElem,
                                              bool IsDivergentIdx) {
if (UseDivergentRegisterIndexing)
  return false;

unsigned VecSize = EltSize * NumElem;

// Sub-dword vectors of size 2 dword or less have better implementation.
if (VecSize <= 64 && EltSize < 32)
  return false;

// Always expand the rest of sub-dword instructions, otherwise it will be
// lowered via memory.
if (EltSize < 32)
  return true;

// Always do this if var-idx is divergent, otherwise it will become a loop.
if (IsDivergentIdx)
  return true;

// Large vectors would yield too many compares and v_cndmask_b32 instructions.
unsigned NumInsts = NumElem /* Number of compares */ +
                    ((EltSize + 31) / 32) * NumElem /* Number of cndmasks */;
return NumInsts <= 16;
10089}

10091static bool shouldExpandVectorDynExt(SDNode *N) {
SDValue Idx = N->getOperand(N->getNumOperands() - 1);
if (isa<ConstantSDNode>(Idx))
  return false;

SDValue Vec = N->getOperand(0);
EVT VecVT = Vec.getValueType();
EVT EltVT = VecVT.getVectorElementType();
unsigned EltSize = EltVT.getSizeInBits();
unsigned NumElem = VecVT.getVectorNumElements();

return SITargetLowering::shouldExpandVectorDynExt(EltSize, NumElem,
                                                  Idx->isDivergent());
10104}

10106SDValue SITargetLowering::performExtractVectorEltCombine(
SDNode *N, DAGCombinerInfo &DCI) const {
SDValue Vec = N->getOperand(0);
SelectionDAG &DAG = DCI.DAG;

EVT VecVT = Vec.getValueType();
EVT EltVT = VecVT.getVectorElementType();

if ((Vec.getOpcode() == ISD::FNEG ||
     Vec.getOpcode() == ISD::FABS) && allUsesHaveSourceMods(N)) {
  SDLoc SL(N);
  EVT EltVT = N->getValueType(0);
  SDValue Idx = N->getOperand(1);
  SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, EltVT,
                            Vec.getOperand(0), Idx);
  return DAG.getNode(Vec.getOpcode(), SL, EltVT, Elt);
}

// ScalarRes = EXTRACT_VECTOR_ELT ((vector-BINOP Vec1, Vec2), Idx)
//    =>
// Vec1Elt = EXTRACT_VECTOR_ELT(Vec1, Idx)
// Vec2Elt = EXTRACT_VECTOR_ELT(Vec2, Idx)
// ScalarRes = scalar-BINOP Vec1Elt, Vec2Elt
if (Vec.hasOneUse() && DCI.isBeforeLegalize()) {
  SDLoc SL(N);
  EVT EltVT = N->getValueType(0);
  SDValue Idx = N->getOperand(1);
  unsigned Opc = Vec.getOpcode();

  switch(Opc) {
  default:
    break;
    // TODO: Support other binary operations.
  case ISD::FADD:
  case ISD::FSUB:
  case ISD::FMUL:
  case ISD::ADD:
  case ISD::UMIN:
  case ISD::UMAX:
  case ISD::SMIN:
  case ISD::SMAX:
  case ISD::FMAXNUM:
  case ISD::FMINNUM:
  case ISD::FMAXNUM_IEEE:
  case ISD::FMINNUM_IEEE: {
    SDValue Elt0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, EltVT,
                               Vec.getOperand(0), Idx);
    SDValue Elt1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, EltVT,
                               Vec.getOperand(1), Idx);

    DCI.AddToWorklist(Elt0.getNode());
    DCI.AddToWorklist(Elt1.getNode());
    return DAG.getNode(Opc, SL, EltVT, Elt0, Elt1, Vec->getFlags());
  }
  }
}

unsigned VecSize = VecVT.getSizeInBits();
unsigned EltSize = EltVT.getSizeInBits();

// EXTRACT_VECTOR_ELT (<n x e>, var-idx) => n x select (e, const-idx)
if (::shouldExpandVectorDynExt(N)) {
  SDLoc SL(N);
  SDValue Idx = N->getOperand(1);
  SDValue V;
  for (unsigned I = 0, E = VecVT.getVectorNumElements(); I < E; ++I) {
    SDValue IC = DAG.getVectorIdxConstant(I, SL);
    SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, EltVT, Vec, IC);
    if (I == 0)
      V = Elt;
    else
      V = DAG.getSelectCC(SL, Idx, IC, Elt, V, ISD::SETEQ);
  }
  return V;
}

if (!DCI.isBeforeLegalize())
  return SDValue();

// Try to turn sub-dword accesses of vectors into accesses of the same 32-bit
// elements. This exposes more load reduction opportunities by replacing
// multiple small extract_vector_elements with a single 32-bit extract.
auto *Idx = dyn_cast<ConstantSDNode>(N->getOperand(1));
if (isa<MemSDNode>(Vec) &&
    EltSize <= 16 &&
    EltVT.isByteSized() &&
    VecSize > 32 &&
    VecSize % 32 == 0 &&
    Idx) {
  EVT NewVT = getEquivalentMemType(*DAG.getContext(), VecVT);

  unsigned BitIndex = Idx->getZExtValue() * EltSize;
  unsigned EltIdx = BitIndex / 32;
  unsigned LeftoverBitIdx = BitIndex % 32;
  SDLoc SL(N);

  SDValue Cast = DAG.getNode(ISD::BITCAST, SL, NewVT, Vec);
  DCI.AddToWorklist(Cast.getNode());

  SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, MVT::i32, Cast,
                            DAG.getConstant(EltIdx, SL, MVT::i32));
  DCI.AddToWorklist(Elt.getNode());
  SDValue Srl = DAG.getNode(ISD::SRL, SL, MVT::i32, Elt,
                            DAG.getConstant(LeftoverBitIdx, SL, MVT::i32));
  DCI.AddToWorklist(Srl.getNode());

  SDValue Trunc = DAG.getNode(ISD::TRUNCATE, SL, EltVT.changeTypeToInteger(), Srl);
  DCI.AddToWorklist(Trunc.getNode());
  return DAG.getNode(ISD::BITCAST, SL, EltVT, Trunc);
}

return SDValue();
10218}

10220SDValue
10221SITargetLowering::performInsertVectorEltCombine(SDNode *N,
                                              DAGCombinerInfo &DCI) const {
SDValue Vec = N->getOperand(0);
SDValue Idx = N->getOperand(2);
EVT VecVT = Vec.getValueType();
EVT EltVT = VecVT.getVectorElementType();

// INSERT_VECTOR_ELT (<n x e>, var-idx)
// => BUILD_VECTOR n x select (e, const-idx)
if (!::shouldExpandVectorDynExt(N))
  return SDValue();

SelectionDAG &DAG = DCI.DAG;
SDLoc SL(N);
SDValue Ins = N->getOperand(1);
EVT IdxVT = Idx.getValueType();

SmallVector<SDValue, 16> Ops;
for (unsigned I = 0, E = VecVT.getVectorNumElements(); I < E; ++I) {
  SDValue IC = DAG.getConstant(I, SL, IdxVT);
  SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, SL, EltVT, Vec, IC);
  SDValue V = DAG.getSelectCC(SL, Idx, IC, Ins, Elt, ISD::SETEQ);
  Ops.push_back(V);
}

return DAG.getBuildVector(VecVT, SL, Ops);
10247}

10249unsigned SITargetLowering::getFusedOpcode(const SelectionDAG &DAG,
                                        const SDNode *N0,
                                        const SDNode *N1) const {
EVT VT = N0->getValueType(0);

// Only do this if we are not trying to support denormals. v_mad_f32 does not
// support denormals ever.
if (((VT == MVT::f32 && !hasFP32Denormals(DAG.getMachineFunction())) ||
     (VT == MVT::f16 && !hasFP64FP16Denormals(DAG.getMachineFunction()) &&
      getSubtarget()->hasMadF16())) &&
     isOperationLegal(ISD::FMAD, VT))
  return ISD::FMAD;

const TargetOptions &Options = DAG.getTarget().Options;
if ((Options.AllowFPOpFusion == FPOpFusion::Fast || Options.UnsafeFPMath ||
     (N0->getFlags().hasAllowContract() &&
      N1->getFlags().hasAllowContract())) &&
    isFMAFasterThanFMulAndFAdd(DAG.getMachineFunction(), VT)) {
  return ISD::FMA;
}

return 0;
10271}

10273// For a reassociatable opcode perform:
10274// op x, (op y, z) -> op (op x, z), y, if x and z are uniform
10275SDValue SITargetLowering::reassociateScalarOps(SDNode *N,
                                             SelectionDAG &DAG) const {
EVT VT = N->getValueType(0);
if (VT != MVT::i32 && VT != MVT::i64)
  return SDValue();

unsigned Opc = N->getOpcode();
SDValue Op0 = N->getOperand(0);
SDValue Op1 = N->getOperand(1);

if (!(Op0->isDivergent() ^ Op1->isDivergent()))
  return SDValue();

if (Op0->isDivergent())
  std::swap(Op0, Op1);

if (Op1.getOpcode() != Opc || !Op1.hasOneUse())
  return SDValue();

SDValue Op2 = Op1.getOperand(1);
Op1 = Op1.getOperand(0);
if (!(Op1->isDivergent() ^ Op2->isDivergent()))
  return SDValue();

if (Op1->isDivergent())
  std::swap(Op1, Op2);

// If either operand is constant this will conflict with
// DAGCombiner::ReassociateOps().
if (DAG.isConstantIntBuildVectorOrConstantInt(Op0) ||
    DAG.isConstantIntBuildVectorOrConstantInt(Op1))
  return SDValue();

SDLoc SL(N);
SDValue Add1 = DAG.getNode(Opc, SL, VT, Op0, Op1);
return DAG.getNode(Opc, SL, VT, Add1, Op2);
10311}

10313static SDValue getMad64_32(SelectionDAG &DAG, const SDLoc &SL,
                         EVT VT,
                         SDValue N0, SDValue N1, SDValue N2,
                         bool Signed) {
unsigned MadOpc = Signed ? AMDGPUISD::MAD_I64_I32 : AMDGPUISD::MAD_U64_U32;
SDVTList VTs = DAG.getVTList(MVT::i64, MVT::i1);
SDValue Mad = DAG.getNode(MadOpc, SL, VTs, N0, N1, N2);
return DAG.getNode(ISD::TRUNCATE, SL, VT, Mad);
10321}

10323SDValue SITargetLowering::performAddCombine(SDNode *N,
                                          DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
EVT VT = N->getValueType(0);
SDLoc SL(N);
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);

if ((LHS.getOpcode() == ISD::MUL || RHS.getOpcode() == ISD::MUL)
    && Subtarget->hasMad64_32() &&
    !VT.isVector() && VT.getScalarSizeInBits() > 32 &&
    VT.getScalarSizeInBits() <= 64) {
  if (LHS.getOpcode() != ISD::MUL)
    std::swap(LHS, RHS);

  SDValue MulLHS = LHS.getOperand(0);
  SDValue MulRHS = LHS.getOperand(1);
  SDValue AddRHS = RHS;

  // TODO: Maybe restrict if SGPR inputs.
  if (numBitsUnsigned(MulLHS, DAG) <= 32 &&
      numBitsUnsigned(MulRHS, DAG) <= 32) {
    MulLHS = DAG.getZExtOrTrunc(MulLHS, SL, MVT::i32);
    MulRHS = DAG.getZExtOrTrunc(MulRHS, SL, MVT::i32);
    AddRHS = DAG.getZExtOrTrunc(AddRHS, SL, MVT::i64);
    return getMad64_32(DAG, SL, VT, MulLHS, MulRHS, AddRHS, false);
  }

  if (numBitsSigned(MulLHS, DAG) < 32 && numBitsSigned(MulRHS, DAG) < 32) {
    MulLHS = DAG.getSExtOrTrunc(MulLHS, SL, MVT::i32);
    MulRHS = DAG.getSExtOrTrunc(MulRHS, SL, MVT::i32);
    AddRHS = DAG.getSExtOrTrunc(AddRHS, SL, MVT::i64);
    return getMad64_32(DAG, SL, VT, MulLHS, MulRHS, AddRHS, true);
  }

  return SDValue();
}

if (SDValue V = reassociateScalarOps(N, DAG)) {
  return V;
}

if (VT != MVT::i32 || !DCI.isAfterLegalizeDAG())
  return SDValue();

// add x, zext (setcc) => addcarry x, 0, setcc
// add x, sext (setcc) => subcarry x, 0, setcc
unsigned Opc = LHS.getOpcode();
if (Opc == ISD::ZERO_EXTEND || Opc == ISD::SIGN_EXTEND ||
    Opc == ISD::ANY_EXTEND || Opc == ISD::ADDCARRY)
  std::swap(RHS, LHS);

Opc = RHS.getOpcode();
switch (Opc) {
default: break;
case ISD::ZERO_EXTEND:
case ISD::SIGN_EXTEND:
case ISD::ANY_EXTEND: {
  auto Cond = RHS.getOperand(0);
  // If this won't be a real VOPC output, we would still need to insert an
  // extra instruction anyway.
  if (!isBoolSGPR(Cond))
    break;
  SDVTList VTList = DAG.getVTList(MVT::i32, MVT::i1);
  SDValue Args[] = { LHS, DAG.getConstant(0, SL, MVT::i32), Cond };
  Opc = (Opc == ISD::SIGN_EXTEND) ? ISD::SUBCARRY : ISD::ADDCARRY;
  return DAG.getNode(Opc, SL, VTList, Args);
}
case ISD::ADDCARRY: {
  // add x, (addcarry y, 0, cc) => addcarry x, y, cc
  auto C = dyn_cast<ConstantSDNode>(RHS.getOperand(1));
  if (!C || C->getZExtValue() != 0) break;
  SDValue Args[] = { LHS, RHS.getOperand(0), RHS.getOperand(2) };
  return DAG.getNode(ISD::ADDCARRY, SDLoc(N), RHS->getVTList(), Args);
}
}
return SDValue();
10400}

10402SDValue SITargetLowering::performSubCombine(SDNode *N,
                                          DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
EVT VT = N->getValueType(0);

if (VT != MVT::i32)
  return SDValue();

SDLoc SL(N);
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);

// sub x, zext (setcc) => subcarry x, 0, setcc
// sub x, sext (setcc) => addcarry x, 0, setcc
unsigned Opc = RHS.getOpcode();
switch (Opc) {
default: break;
case ISD::ZERO_EXTEND:
case ISD::SIGN_EXTEND:
case ISD::ANY_EXTEND: {
  auto Cond = RHS.getOperand(0);
  // If this won't be a real VOPC output, we would still need to insert an
  // extra instruction anyway.
  if (!isBoolSGPR(Cond))
    break;
  SDVTList VTList = DAG.getVTList(MVT::i32, MVT::i1);
  SDValue Args[] = { LHS, DAG.getConstant(0, SL, MVT::i32), Cond };
  Opc = (Opc == ISD::SIGN_EXTEND) ? ISD::ADDCARRY : ISD::SUBCARRY;
  return DAG.getNode(Opc, SL, VTList, Args);
}
}

if (LHS.getOpcode() == ISD::SUBCARRY) {
  // sub (subcarry x, 0, cc), y => subcarry x, y, cc
  auto C = dyn_cast<ConstantSDNode>(LHS.getOperand(1));
  if (!C || !C->isNullValue())
    return SDValue();
  SDValue Args[] = { LHS.getOperand(0), RHS, LHS.getOperand(2) };
  return DAG.getNode(ISD::SUBCARRY, SDLoc(N), LHS->getVTList(), Args);
}
return SDValue();
10443}

10445SDValue SITargetLowering::performAddCarrySubCarryCombine(SDNode *N,
DAGCombinerInfo &DCI) const {

if (N->getValueType(0) != MVT::i32)
  return SDValue();

auto C = dyn_cast<ConstantSDNode>(N->getOperand(1));
if (!C || C->getZExtValue() != 0)
  return SDValue();

SelectionDAG &DAG = DCI.DAG;
SDValue LHS = N->getOperand(0);

// addcarry (add x, y), 0, cc => addcarry x, y, cc
// subcarry (sub x, y), 0, cc => subcarry x, y, cc
unsigned LHSOpc = LHS.getOpcode();
unsigned Opc = N->getOpcode();
if ((LHSOpc == ISD::ADD && Opc == ISD::ADDCARRY) ||
    (LHSOpc == ISD::SUB && Opc == ISD::SUBCARRY)) {
  SDValue Args[] = { LHS.getOperand(0), LHS.getOperand(1), N->getOperand(2) };
  return DAG.getNode(Opc, SDLoc(N), N->getVTList(), Args);
}
return SDValue();
10468}

10470SDValue SITargetLowering::performFAddCombine(SDNode *N,
                                           DAGCombinerInfo &DCI) const {
if (DCI.getDAGCombineLevel() < AfterLegalizeDAG)
  return SDValue();

SelectionDAG &DAG = DCI.DAG;
EVT VT = N->getValueType(0);

SDLoc SL(N);
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);

// These should really be instruction patterns, but writing patterns with
// source modiifiers is a pain.

// fadd (fadd (a, a), b) -> mad 2.0, a, b
if (LHS.getOpcode() == ISD::FADD) {
  SDValue A = LHS.getOperand(0);
  if (A == LHS.getOperand(1)) {
    unsigned FusedOp = getFusedOpcode(DAG, N, LHS.getNode());
    if (FusedOp != 0) {
      const SDValue Two = DAG.getConstantFP(2.0, SL, VT);
      return DAG.getNode(FusedOp, SL, VT, A, Two, RHS);
    }
  }
}

// fadd (b, fadd (a, a)) -> mad 2.0, a, b
if (RHS.getOpcode() == ISD::FADD) {
  SDValue A = RHS.getOperand(0);
  if (A == RHS.getOperand(1)) {
    unsigned FusedOp = getFusedOpcode(DAG, N, RHS.getNode());
    if (FusedOp != 0) {
      const SDValue Two = DAG.getConstantFP(2.0, SL, VT);
      return DAG.getNode(FusedOp, SL, VT, A, Two, LHS);
    }
  }
}

return SDValue();
10510}

10512SDValue SITargetLowering::performFSubCombine(SDNode *N,
                                           DAGCombinerInfo &DCI) const {
if (DCI.getDAGCombineLevel() < AfterLegalizeDAG)
  return SDValue();

SelectionDAG &DAG = DCI.DAG;
SDLoc SL(N);
EVT VT = N->getValueType(0);
assert(!VT.isVector())((void)0);

// Try to get the fneg to fold into the source modifier. This undoes generic
// DAG combines and folds them into the mad.
//
// Only do this if we are not trying to support denormals. v_mad_f32 does
// not support denormals ever.
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
if (LHS.getOpcode() == ISD::FADD) {
  // (fsub (fadd a, a), c) -> mad 2.0, a, (fneg c)
  SDValue A = LHS.getOperand(0);
  if (A == LHS.getOperand(1)) {
    unsigned FusedOp = getFusedOpcode(DAG, N, LHS.getNode());
    if (FusedOp != 0){
      const SDValue Two = DAG.getConstantFP(2.0, SL, VT);
      SDValue NegRHS = DAG.getNode(ISD::FNEG, SL, VT, RHS);

      return DAG.getNode(FusedOp, SL, VT, A, Two, NegRHS);
    }
  }
}

if (RHS.getOpcode() == ISD::FADD) {
  // (fsub c, (fadd a, a)) -> mad -2.0, a, c

  SDValue A = RHS.getOperand(0);
  if (A == RHS.getOperand(1)) {
    unsigned FusedOp = getFusedOpcode(DAG, N, RHS.getNode());
    if (FusedOp != 0){
      const SDValue NegTwo = DAG.getConstantFP(-2.0, SL, VT);
      return DAG.getNode(FusedOp, SL, VT, A, NegTwo, LHS);
    }
  }
}

return SDValue();
10557}

10559SDValue SITargetLowering::performFMACombine(SDNode *N,
                                          DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
EVT VT = N->getValueType(0);
SDLoc SL(N);

if (!Subtarget->hasDot7Insts() || VT != MVT::f32)
  return SDValue();

// FMA((F32)S0.x, (F32)S1. x, FMA((F32)S0.y, (F32)S1.y, (F32)z)) ->
//   FDOT2((V2F16)S0, (V2F16)S1, (F32)z))
SDValue Op1 = N->getOperand(0);
SDValue Op2 = N->getOperand(1);
SDValue FMA = N->getOperand(2);

if (FMA.getOpcode() != ISD::FMA ||
    Op1.getOpcode() != ISD::FP_EXTEND ||
    Op2.getOpcode() != ISD::FP_EXTEND)
  return SDValue();

// fdot2_f32_f16 always flushes fp32 denormal operand and output to zero,
// regardless of the denorm mode setting. Therefore, unsafe-fp-math/fp-contract
// is sufficient to allow generaing fdot2.
const TargetOptions &Options = DAG.getTarget().Options;
if (Options.AllowFPOpFusion == FPOpFusion::Fast || Options.UnsafeFPMath ||
    (N->getFlags().hasAllowContract() &&
     FMA->getFlags().hasAllowContract())) {
  Op1 = Op1.getOperand(0);
  Op2 = Op2.getOperand(0);
  if (Op1.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
      Op2.getOpcode() != ISD::EXTRACT_VECTOR_ELT)
    return SDValue();

  SDValue Vec1 = Op1.getOperand(0);
  SDValue Idx1 = Op1.getOperand(1);
  SDValue Vec2 = Op2.getOperand(0);

  SDValue FMAOp1 = FMA.getOperand(0);
  SDValue FMAOp2 = FMA.getOperand(1);
  SDValue FMAAcc = FMA.getOperand(2);

  if (FMAOp1.getOpcode() != ISD::FP_EXTEND ||
      FMAOp2.getOpcode() != ISD::FP_EXTEND)
    return SDValue();

  FMAOp1 = FMAOp1.getOperand(0);
  FMAOp2 = FMAOp2.getOperand(0);
  if (FMAOp1.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
      FMAOp2.getOpcode() != ISD::EXTRACT_VECTOR_ELT)
    return SDValue();

  SDValue Vec3 = FMAOp1.getOperand(0);
  SDValue Vec4 = FMAOp2.getOperand(0);
  SDValue Idx2 = FMAOp1.getOperand(1);

  if (Idx1 != Op2.getOperand(1) || Idx2 != FMAOp2.getOperand(1) ||
      // Idx1 and Idx2 cannot be the same.
      Idx1 == Idx2)
    return SDValue();

  if (Vec1 == Vec2 || Vec3 == Vec4)
    return SDValue();

  if (Vec1.getValueType() != MVT::v2f16 || Vec2.getValueType() != MVT::v2f16)
    return SDValue();

  if ((Vec1 == Vec3 && Vec2 == Vec4) ||
      (Vec1 == Vec4 && Vec2 == Vec3)) {
    return DAG.getNode(AMDGPUISD::FDOT2, SL, MVT::f32, Vec1, Vec2, FMAAcc,
                       DAG.getTargetConstant(0, SL, MVT::i1));
  }
}
return SDValue();
10632}

10634SDValue SITargetLowering::performSetCCCombine(SDNode *N,
                                            DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
SDLoc SL(N);

SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
EVT VT = LHS.getValueType();
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();

auto CRHS = dyn_cast<ConstantSDNode>(RHS);
if (!CRHS) {
  CRHS = dyn_cast<ConstantSDNode>(LHS);
  if (CRHS) {
    std::swap(LHS, RHS);
    CC = getSetCCSwappedOperands(CC);
  }
}

if (CRHS) {
  if (VT == MVT::i32 && LHS.getOpcode() == ISD::SIGN_EXTEND &&
      isBoolSGPR(LHS.getOperand(0))) {
    // setcc (sext from i1 cc), -1, ne|sgt|ult) => not cc => xor cc, -1
    // setcc (sext from i1 cc), -1, eq|sle|uge) => cc
    // setcc (sext from i1 cc),  0, eq|sge|ule) => not cc => xor cc, -1
    // setcc (sext from i1 cc),  0, ne|ugt|slt) => cc
    if ((CRHS->isAllOnesValue() &&
         (CC == ISD::SETNE || CC == ISD::SETGT || CC == ISD::SETULT)) ||
        (CRHS->isNullValue() &&
         (CC == ISD::SETEQ || CC == ISD::SETGE || CC == ISD::SETULE)))
      return DAG.getNode(ISD::XOR, SL, MVT::i1, LHS.getOperand(0),
                         DAG.getConstant(-1, SL, MVT::i1));
    if ((CRHS->isAllOnesValue() &&
         (CC == ISD::SETEQ || CC == ISD::SETLE || CC == ISD::SETUGE)) ||
        (CRHS->isNullValue() &&
         (CC == ISD::SETNE || CC == ISD::SETUGT || CC == ISD::SETLT)))
      return LHS.getOperand(0);
  }

  uint64_t CRHSVal = CRHS->getZExtValue();
  if ((CC == ISD::SETEQ || CC == ISD::SETNE) &&
      LHS.getOpcode() == ISD::SELECT &&
      isa<ConstantSDNode>(LHS.getOperand(1)) &&
      isa<ConstantSDNode>(LHS.getOperand(2)) &&
      LHS.getConstantOperandVal(1) != LHS.getConstantOperandVal(2) &&
      isBoolSGPR(LHS.getOperand(0))) {
    // Given CT != FT:
    // setcc (select cc, CT, CF), CF, eq => xor cc, -1
    // setcc (select cc, CT, CF), CF, ne => cc
    // setcc (select cc, CT, CF), CT, ne => xor cc, -1
    // setcc (select cc, CT, CF), CT, eq => cc
    uint64_t CT = LHS.getConstantOperandVal(1);
    uint64_t CF = LHS.getConstantOperandVal(2);

    if ((CF == CRHSVal && CC == ISD::SETEQ) ||
        (CT == CRHSVal && CC == ISD::SETNE))
      return DAG.getNode(ISD::XOR, SL, MVT::i1, LHS.getOperand(0),
                         DAG.getConstant(-1, SL, MVT::i1));
    if ((CF == CRHSVal && CC == ISD::SETNE) ||
        (CT == CRHSVal && CC == ISD::SETEQ))
      return LHS.getOperand(0);
  }
}

if (VT != MVT::f32 && VT != MVT::f64 && (Subtarget->has16BitInsts() &&
                                         VT != MVT::f16))
  return SDValue();

// Match isinf/isfinite pattern
// (fcmp oeq (fabs x), inf) -> (fp_class x, (p_infinity | n_infinity))
// (fcmp one (fabs x), inf) -> (fp_class x,
// (p_normal | n_normal | p_subnormal | n_subnormal | p_zero | n_zero)
if ((CC == ISD::SETOEQ || CC == ISD::SETONE) && LHS.getOpcode() == ISD::FABS) {
  const ConstantFPSDNode *CRHS = dyn_cast<ConstantFPSDNode>(RHS);
  if (!CRHS)
    return SDValue();

  const APFloat &APF = CRHS->getValueAPF();
  if (APF.isInfinity() && !APF.isNegative()) {
    const unsigned IsInfMask = SIInstrFlags::P_INFINITY |
                               SIInstrFlags::N_INFINITY;
    const unsigned IsFiniteMask = SIInstrFlags::N_ZERO |
                                  SIInstrFlags::P_ZERO |
                                  SIInstrFlags::N_NORMAL |
                                  SIInstrFlags::P_NORMAL |
                                  SIInstrFlags::N_SUBNORMAL |
                                  SIInstrFlags::P_SUBNORMAL;
    unsigned Mask = CC == ISD::SETOEQ ? IsInfMask : IsFiniteMask;
    return DAG.getNode(AMDGPUISD::FP_CLASS, SL, MVT::i1, LHS.getOperand(0),
                       DAG.getConstant(Mask, SL, MVT::i32));
  }
}

return SDValue();
10728}

10730SDValue SITargetLowering::performCvtF32UByteNCombine(SDNode *N,
                                                   DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
SDLoc SL(N);
unsigned Offset = N->getOpcode() - AMDGPUISD::CVT_F32_UBYTE0;

SDValue Src = N->getOperand(0);
SDValue Shift = N->getOperand(0);

// TODO: Extend type shouldn't matter (assuming legal types).
if (Shift.getOpcode() == ISD::ZERO_EXTEND)
  Shift = Shift.getOperand(0);

if (Shift.getOpcode() == ISD::SRL || Shift.getOpcode() == ISD::SHL) {
  // cvt_f32_ubyte1 (shl x,  8) -> cvt_f32_ubyte0 x
  // cvt_f32_ubyte3 (shl x, 16) -> cvt_f32_ubyte1 x
  // cvt_f32_ubyte0 (srl x, 16) -> cvt_f32_ubyte2 x
  // cvt_f32_ubyte1 (srl x, 16) -> cvt_f32_ubyte3 x
  // cvt_f32_ubyte0 (srl x,  8) -> cvt_f32_ubyte1 x
  if (auto *C = dyn_cast<ConstantSDNode>(Shift.getOperand(1))) {
    Shift = DAG.getZExtOrTrunc(Shift.getOperand(0),
                               SDLoc(Shift.getOperand(0)), MVT::i32);

    unsigned ShiftOffset = 8 * Offset;
    if (Shift.getOpcode() == ISD::SHL)
      ShiftOffset -= C->getZExtValue();
    else
      ShiftOffset += C->getZExtValue();

    if (ShiftOffset < 32 && (ShiftOffset % 8) == 0) {
      return DAG.getNode(AMDGPUISD::CVT_F32_UBYTE0 + ShiftOffset / 8, SL,
                         MVT::f32, Shift);
    }
  }
}

const TargetLowering &TLI = DAG.getTargetLoweringInfo();
APInt DemandedBits = APInt::getBitsSet(32, 8 * Offset, 8 * Offset + 8);
if (TLI.SimplifyDemandedBits(Src, DemandedBits, DCI)) {
  // We simplified Src. If this node is not dead, visit it again so it is
  // folded properly.
  if (N->getOpcode() != ISD::DELETED_NODE)
    DCI.AddToWorklist(N);
  return SDValue(N, 0);
}

// Handle (or x, (srl y, 8)) pattern when known bits are zero.
if (SDValue DemandedSrc =
        TLI.SimplifyMultipleUseDemandedBits(Src, DemandedBits, DAG))
  return DAG.getNode(N->getOpcode(), SL, MVT::f32, DemandedSrc);

return SDValue();
10782}

10784SDValue SITargetLowering::performClampCombine(SDNode *N,
                                            DAGCombinerInfo &DCI) const {
ConstantFPSDNode *CSrc = dyn_cast<ConstantFPSDNode>(N->getOperand(0));
if (!CSrc)
  return SDValue();

const MachineFunction &MF = DCI.DAG.getMachineFunction();
const APFloat &F = CSrc->getValueAPF();
APFloat Zero = APFloat::getZero(F.getSemantics());
if (F < Zero ||
    (F.isNaN() && MF.getInfo<SIMachineFunctionInfo>()->getMode().DX10Clamp)) {
  return DCI.DAG.getConstantFP(Zero, SDLoc(N), N->getValueType(0));
}

APFloat One(F.getSemantics(), "1.0");
if (F > One)
  return DCI.DAG.getConstantFP(One, SDLoc(N), N->getValueType(0));

return SDValue(CSrc, 0);
10803}


10806SDValue SITargetLowering::PerformDAGCombine(SDNode *N,
                                          DAGCombinerInfo &DCI) const {
if (getTargetMachine().getOptLevel() == CodeGenOpt::None)
1
Assuming the condition is false→
2
←
Taking false branch→
  return SDValue();
switch (N->getOpcode()) {
3
←
Control jumps to 'case AND:'  at line 10837→
case ISD::ADD:
  return performAddCombine(N, DCI);
case ISD::SUB:
  return performSubCombine(N, DCI);
case ISD::ADDCARRY:
case ISD::SUBCARRY:
  return performAddCarrySubCarryCombine(N, DCI);
case ISD::FADD:
  return performFAddCombine(N, DCI);
case ISD::FSUB:
  return performFSubCombine(N, DCI);
case ISD::SETCC:
  return performSetCCCombine(N, DCI);
case ISD::FMAXNUM:
case ISD::FMINNUM:
case ISD::FMAXNUM_IEEE:
case ISD::FMINNUM_IEEE:
case ISD::SMAX:
case ISD::SMIN:
case ISD::UMAX:
case ISD::UMIN:
case AMDGPUISD::FMIN_LEGACY:
case AMDGPUISD::FMAX_LEGACY:
  return performMinMaxCombine(N, DCI);
case ISD::FMA:
  return performFMACombine(N, DCI);
case ISD::AND:
  return performAndCombine(N, DCI);
4
←
Calling 'SITargetLowering::performAndCombine'→
case ISD::OR:
  return performOrCombine(N, DCI);
case ISD::XOR:
  return performXorCombine(N, DCI);
case ISD::ZERO_EXTEND:
  return performZeroExtendCombine(N, DCI);
case ISD::SIGN_EXTEND_INREG:
  return performSignExtendInRegCombine(N , DCI);
case AMDGPUISD::FP_CLASS:
  return performClassCombine(N, DCI);
case ISD::FCANONICALIZE:
  return performFCanonicalizeCombine(N, DCI);
case AMDGPUISD::RCP:
  return performRcpCombine(N, DCI);
case AMDGPUISD::FRACT:
case AMDGPUISD::RSQ:
case AMDGPUISD::RCP_LEGACY:
case AMDGPUISD::RCP_IFLAG:
case AMDGPUISD::RSQ_CLAMP:
case AMDGPUISD::LDEXP: {
  // FIXME: This is probably wrong. If src is an sNaN, it won't be quieted
  SDValue Src = N->getOperand(0);
  if (Src.isUndef())
    return Src;
  break;
}
case ISD::SINT_TO_FP:
case ISD::UINT_TO_FP:
  return performUCharToFloatCombine(N, DCI);
case AMDGPUISD::CVT_F32_UBYTE0:
case AMDGPUISD::CVT_F32_UBYTE1:
case AMDGPUISD::CVT_F32_UBYTE2:
case AMDGPUISD::CVT_F32_UBYTE3:
  return performCvtF32UByteNCombine(N, DCI);
case AMDGPUISD::FMED3:
  return performFMed3Combine(N, DCI);
case AMDGPUISD::CVT_PKRTZ_F16_F32:
  return performCvtPkRTZCombine(N, DCI);
case AMDGPUISD::CLAMP:
  return performClampCombine(N, DCI);
case ISD::SCALAR_TO_VECTOR: {
  SelectionDAG &DAG = DCI.DAG;
  EVT VT = N->getValueType(0);

  // v2i16 (scalar_to_vector i16:x) -> v2i16 (bitcast (any_extend i16:x))
  if (VT == MVT::v2i16 || VT == MVT::v2f16) {
    SDLoc SL(N);
    SDValue Src = N->getOperand(0);
    EVT EltVT = Src.getValueType();
    if (EltVT == MVT::f16)
      Src = DAG.getNode(ISD::BITCAST, SL, MVT::i16, Src);

    SDValue Ext = DAG.getNode(ISD::ANY_EXTEND, SL, MVT::i32, Src);
    return DAG.getNode(ISD::BITCAST, SL, VT, Ext);
  }

  break;
}
case ISD::EXTRACT_VECTOR_ELT:
  return performExtractVectorEltCombine(N, DCI);
case ISD::INSERT_VECTOR_ELT:
  return performInsertVectorEltCombine(N, DCI);
case ISD::LOAD: {
  if (SDValue Widended = widenLoad(cast<LoadSDNode>(N), DCI))
    return Widended;
  LLVM_FALLTHROUGH[[gnu::fallthrough]];
}
default: {
  if (!DCI.isBeforeLegalize()) {
    if (MemSDNode *MemNode = dyn_cast<MemSDNode>(N))
      return performMemSDNodeCombine(MemNode, DCI);
  }

  break;
}
}

return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
10917}

10919/// Helper function for adjustWritemask
10920static unsigned SubIdx2Lane(unsigned Idx) {
switch (Idx) {
default: return ~0u;
case AMDGPU::sub0: return 0;
case AMDGPU::sub1: return 1;
case AMDGPU::sub2: return 2;
case AMDGPU::sub3: return 3;
case AMDGPU::sub4: return 4; // Possible with TFE/LWE
}
10929}

10931/// Adjust the writemask of MIMG instructions
10932SDNode *SITargetLowering::adjustWritemask(MachineSDNode *&Node,
                                        SelectionDAG &DAG) const {
unsigned Opcode = Node->getMachineOpcode();

// Subtract 1 because the vdata output is not a MachineSDNode operand.
int D16Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::d16) - 1;
if (D16Idx >= 0 && Node->getConstantOperandVal(D16Idx))
  return Node; // not implemented for D16

SDNode *Users[5] = { nullptr };
unsigned Lane = 0;
unsigned DmaskIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::dmask) - 1;
unsigned OldDmask = Node->getConstantOperandVal(DmaskIdx);
unsigned NewDmask = 0;
unsigned TFEIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::tfe) - 1;
unsigned LWEIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::lwe) - 1;
bool UsesTFC = ((int(TFEIdx) >= 0 && Node->getConstantOperandVal(TFEIdx)) ||
                Node->getConstantOperandVal(LWEIdx)) ? 1 : 0;
unsigned TFCLane = 0;
bool HasChain = Node->getNumValues() > 1;

if (OldDmask == 0) {
  // These are folded out, but on the chance it happens don't assert.
  return Node;
}

unsigned OldBitsSet = countPopulation(OldDmask);
// Work out which is the TFE/LWE lane if that is enabled.
if (UsesTFC) {
  TFCLane = OldBitsSet;
}

// Try to figure out the used register components
for (SDNode::use_iterator I = Node->use_begin(), E = Node->use_end();
     I != E; ++I) {

  // Don't look at users of the chain.
  if (I.getUse().getResNo() != 0)
    continue;

  // Abort if we can't understand the usage
  if (!I->isMachineOpcode() ||
      I->getMachineOpcode() != TargetOpcode::EXTRACT_SUBREG)
    return Node;

  // Lane means which subreg of %vgpra_vgprb_vgprc_vgprd is used.
  // Note that subregs are packed, i.e. Lane==0 is the first bit set
  // in OldDmask, so it can be any of X,Y,Z,W; Lane==1 is the second bit
  // set, etc.
  Lane = SubIdx2Lane(I->getConstantOperandVal(1));
  if (Lane == ~0u)
    return Node;

  // Check if the use is for the TFE/LWE generated result at VGPRn+1.
  if (UsesTFC && Lane == TFCLane) {
    Users[Lane] = *I;
  } else {
    // Set which texture component corresponds to the lane.
    unsigned Comp;
    for (unsigned i = 0, Dmask = OldDmask; (i <= Lane) && (Dmask != 0); i++) {
      Comp = countTrailingZeros(Dmask);
      Dmask &= ~(1 << Comp);
    }

    // Abort if we have more than one user per component.
    if (Users[Lane])
      return Node;

    Users[Lane] = *I;
    NewDmask |= 1 << Comp;
  }
}

// Don't allow 0 dmask, as hardware assumes one channel enabled.
bool NoChannels = !NewDmask;
if (NoChannels) {
  if (!UsesTFC) {
    // No uses of the result and not using TFC. Then do nothing.
    return Node;
  }
  // If the original dmask has one channel - then nothing to do
  if (OldBitsSet == 1)
    return Node;
  // Use an arbitrary dmask - required for the instruction to work
  NewDmask = 1;
}
// Abort if there's no change
if (NewDmask == OldDmask)
  return Node;

unsigned BitsSet = countPopulation(NewDmask);

// Check for TFE or LWE - increase the number of channels by one to account
// for the extra return value
// This will need adjustment for D16 if this is also included in
// adjustWriteMask (this function) but at present D16 are excluded.
unsigned NewChannels = BitsSet + UsesTFC;

int NewOpcode =
    AMDGPU::getMaskedMIMGOp(Node->getMachineOpcode(), NewChannels);
assert(NewOpcode != -1 &&((void)0)
       NewOpcode != static_cast<int>(Node->getMachineOpcode()) &&((void)0)
       "failed to find equivalent MIMG op")((void)0);

// Adjust the writemask in the node
SmallVector<SDValue, 12> Ops;
Ops.insert(Ops.end(), Node->op_begin(), Node->op_begin() + DmaskIdx);
Ops.push_back(DAG.getTargetConstant(NewDmask, SDLoc(Node), MVT::i32));
Ops.insert(Ops.end(), Node->op_begin() + DmaskIdx + 1, Node->op_end());

MVT SVT = Node->getValueType(0).getVectorElementType().getSimpleVT();

MVT ResultVT = NewChannels == 1 ?
  SVT : MVT::getVectorVT(SVT, NewChannels == 3 ? 4 :
                         NewChannels == 5 ? 8 : NewChannels);
SDVTList NewVTList = HasChain ?
  DAG.getVTList(ResultVT, MVT::Other) : DAG.getVTList(ResultVT);


MachineSDNode *NewNode = DAG.getMachineNode(NewOpcode, SDLoc(Node),
                                            NewVTList, Ops);

if (HasChain) {
  // Update chain.
  DAG.setNodeMemRefs(NewNode, Node->memoperands());
  DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 1), SDValue(NewNode, 1));
}

if (NewChannels == 1) {
  assert(Node->hasNUsesOfValue(1, 0))((void)0);
  SDNode *Copy = DAG.getMachineNode(TargetOpcode::COPY,
                                    SDLoc(Node), Users[Lane]->getValueType(0),
                                    SDValue(NewNode, 0));
  DAG.ReplaceAllUsesWith(Users[Lane], Copy);
  return nullptr;
}

// Update the users of the node with the new indices
for (unsigned i = 0, Idx = AMDGPU::sub0; i < 5; ++i) {
  SDNode *User = Users[i];
  if (!User) {
    // Handle the special case of NoChannels. We set NewDmask to 1 above, but
    // Users[0] is still nullptr because channel 0 doesn't really have a use.
    if (i || !NoChannels)
      continue;
  } else {
    SDValue Op = DAG.getTargetConstant(Idx, SDLoc(User), MVT::i32);
    DAG.UpdateNodeOperands(User, SDValue(NewNode, 0), Op);
  }

  switch (Idx) {
  default: break;
  case AMDGPU::sub0: Idx = AMDGPU::sub1; break;
  case AMDGPU::sub1: Idx = AMDGPU::sub2; break;
  case AMDGPU::sub2: Idx = AMDGPU::sub3; break;
  case AMDGPU::sub3: Idx = AMDGPU::sub4; break;
  }
}

DAG.RemoveDeadNode(Node);
return nullptr;
11093}

11095static bool isFrameIndexOp(SDValue Op) {
if (Op.getOpcode() == ISD::AssertZext)
  Op = Op.getOperand(0);

return isa<FrameIndexSDNode>(Op);
11100}

11102/// Legalize target independent instructions (e.g. INSERT_SUBREG)
11103/// with frame index operands.
11104/// LLVM assumes that inputs are to these instructions are registers.
11105SDNode *SITargetLowering::legalizeTargetIndependentNode(SDNode *Node,
                                                      SelectionDAG &DAG) const {
if (Node->getOpcode() == ISD::CopyToReg) {
  RegisterSDNode *DestReg = cast<RegisterSDNode>(Node->getOperand(1));
  SDValue SrcVal = Node->getOperand(2);

  // Insert a copy to a VReg_1 virtual register so LowerI1Copies doesn't have
  // to try understanding copies to physical registers.
  if (SrcVal.getValueType() == MVT::i1 && DestReg->getReg().isPhysical()) {
    SDLoc SL(Node);
    MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
    SDValue VReg = DAG.getRegister(
      MRI.createVirtualRegister(&AMDGPU::VReg_1RegClass), MVT::i1);

    SDNode *Glued = Node->getGluedNode();
    SDValue ToVReg
      = DAG.getCopyToReg(Node->getOperand(0), SL, VReg, SrcVal,
                       SDValue(Glued, Glued ? Glued->getNumValues() - 1 : 0));
    SDValue ToResultReg
      = DAG.getCopyToReg(ToVReg, SL, SDValue(DestReg, 0),
                         VReg, ToVReg.getValue(1));
    DAG.ReplaceAllUsesWith(Node, ToResultReg.getNode());
    DAG.RemoveDeadNode(Node);
    return ToResultReg.getNode();
  }
}

SmallVector<SDValue, 8> Ops;
for (unsigned i = 0; i < Node->getNumOperands(); ++i) {
  if (!isFrameIndexOp(Node->getOperand(i))) {
    Ops.push_back(Node->getOperand(i));
    continue;
  }

  SDLoc DL(Node);
  Ops.push_back(SDValue(DAG.getMachineNode(AMDGPU::S_MOV_B32, DL,
                                   Node->getOperand(i).getValueType(),
                                   Node->getOperand(i)), 0));
}

return DAG.UpdateNodeOperands(Node, Ops);
11146}

11148/// Fold the instructions after selecting them.
11149/// Returns null if users were already updated.
11150SDNode *SITargetLowering::PostISelFolding(MachineSDNode *Node,
                                        SelectionDAG &DAG) const {
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
unsigned Opcode = Node->getMachineOpcode();

if (TII->isMIMG(Opcode) && !TII->get(Opcode).mayStore() &&
    !TII->isGather4(Opcode) &&
    AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::dmask) != -1) {
  return adjustWritemask(Node, DAG);
}

if (Opcode == AMDGPU::INSERT_SUBREG ||
    Opcode == AMDGPU::REG_SEQUENCE) {
  legalizeTargetIndependentNode(Node, DAG);
  return Node;
}

switch (Opcode) {
case AMDGPU::V_DIV_SCALE_F32_e64:
case AMDGPU::V_DIV_SCALE_F64_e64: {
  // Satisfy the operand register constraint when one of the inputs is
  // undefined. Ordinarily each undef value will have its own implicit_def of
  // a vreg, so force these to use a single register.
  SDValue Src0 = Node->getOperand(1);
  SDValue Src1 = Node->getOperand(3);
  SDValue Src2 = Node->getOperand(5);

  if ((Src0.isMachineOpcode() &&
       Src0.getMachineOpcode() != AMDGPU::IMPLICIT_DEF) &&
      (Src0 == Src1 || Src0 == Src2))
    break;

  MVT VT = Src0.getValueType().getSimpleVT();
  const TargetRegisterClass *RC =
      getRegClassFor(VT, Src0.getNode()->isDivergent());

  MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
  SDValue UndefReg = DAG.getRegister(MRI.createVirtualRegister(RC), VT);

  SDValue ImpDef = DAG.getCopyToReg(DAG.getEntryNode(), SDLoc(Node),
                                    UndefReg, Src0, SDValue());

  // src0 must be the same register as src1 or src2, even if the value is
  // undefined, so make sure we don't violate this constraint.
  if (Src0.isMachineOpcode() &&
      Src0.getMachineOpcode() == AMDGPU::IMPLICIT_DEF) {
    if (Src1.isMachineOpcode() &&
        Src1.getMachineOpcode() != AMDGPU::IMPLICIT_DEF)
      Src0 = Src1;
    else if (Src2.isMachineOpcode() &&
             Src2.getMachineOpcode() != AMDGPU::IMPLICIT_DEF)
      Src0 = Src2;
    else {
      assert(Src1.getMachineOpcode() == AMDGPU::IMPLICIT_DEF)((void)0);
      Src0 = UndefReg;
      Src1 = UndefReg;
    }
  } else
    break;

  SmallVector<SDValue, 9> Ops(Node->op_begin(), Node->op_end());
  Ops[1] = Src0;
  Ops[3] = Src1;
  Ops[5] = Src2;
  Ops.push_back(ImpDef.getValue(1));
  return DAG.getMachineNode(Opcode, SDLoc(Node), Node->getVTList(), Ops);
}
default:
  break;
}

return Node;
11222}

11224// Any MIMG instructions that use tfe or lwe require an initialization of the
11225// result register that will be written in the case of a memory access failure.
11226// The required code is also added to tie this init code to the result of the
11227// img instruction.
11228void SITargetLowering::AddIMGInit(MachineInstr &MI) const {
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
const SIRegisterInfo &TRI = TII->getRegisterInfo();
MachineRegisterInfo &MRI = MI.getMF()->getRegInfo();
MachineBasicBlock &MBB = *MI.getParent();

MachineOperand *TFE = TII->getNamedOperand(MI, AMDGPU::OpName::tfe);
MachineOperand *LWE = TII->getNamedOperand(MI, AMDGPU::OpName::lwe);
MachineOperand *D16 = TII->getNamedOperand(MI, AMDGPU::OpName::d16);

if (!TFE && !LWE) // intersect_ray
  return;

unsigned TFEVal = TFE ? TFE->getImm() : 0;
unsigned LWEVal = LWE->getImm();
unsigned D16Val = D16 ? D16->getImm() : 0;

if (!TFEVal && !LWEVal)
  return;

// At least one of TFE or LWE are non-zero
// We have to insert a suitable initialization of the result value and
// tie this to the dest of the image instruction.

const DebugLoc &DL = MI.getDebugLoc();

int DstIdx =
    AMDGPU::getNamedOperandIdx(MI.getOpcode(), AMDGPU::OpName::vdata);

// Calculate which dword we have to initialize to 0.
MachineOperand *MO_Dmask = TII->getNamedOperand(MI, AMDGPU::OpName::dmask);

// check that dmask operand is found.
assert(MO_Dmask && "Expected dmask operand in instruction")((void)0);

unsigned dmask = MO_Dmask->getImm();
// Determine the number of active lanes taking into account the
// Gather4 special case
unsigned ActiveLanes = TII->isGather4(MI) ? 4 : countPopulation(dmask);

bool Packed = !Subtarget->hasUnpackedD16VMem();

unsigned InitIdx =
    D16Val && Packed ? ((ActiveLanes + 1) >> 1) + 1 : ActiveLanes + 1;

// Abandon attempt if the dst size isn't large enough
// - this is in fact an error but this is picked up elsewhere and
// reported correctly.
uint32_t DstSize = TRI.getRegSizeInBits(*TII->getOpRegClass(MI, DstIdx)) / 32;
if (DstSize < InitIdx)
  return;

// Create a register for the intialization value.
Register PrevDst = MRI.createVirtualRegister(TII->getOpRegClass(MI, DstIdx));
unsigned NewDst = 0; // Final initialized value will be in here

// If PRTStrictNull feature is enabled (the default) then initialize
// all the result registers to 0, otherwise just the error indication
// register (VGPRn+1)
unsigned SizeLeft = Subtarget->usePRTStrictNull() ? InitIdx : 1;
unsigned CurrIdx = Subtarget->usePRTStrictNull() ? 0 : (InitIdx - 1);

BuildMI(MBB, MI, DL, TII->get(AMDGPU::IMPLICIT_DEF), PrevDst);
for (; SizeLeft; SizeLeft--, CurrIdx++) {
  NewDst = MRI.createVirtualRegister(TII->getOpRegClass(MI, DstIdx));
  // Initialize dword
  Register SubReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
  BuildMI(MBB, MI, DL, TII->get(AMDGPU::V_MOV_B32_e32), SubReg)
    .addImm(0);
  // Insert into the super-reg
  BuildMI(MBB, MI, DL, TII->get(TargetOpcode::INSERT_SUBREG), NewDst)
    .addReg(PrevDst)
    .addReg(SubReg)
    .addImm(SIRegisterInfo::getSubRegFromChannel(CurrIdx));

  PrevDst = NewDst;
}

// Add as an implicit operand
MI.addOperand(MachineOperand::CreateReg(NewDst, false, true));

// Tie the just added implicit operand to the dst
MI.tieOperands(DstIdx, MI.getNumOperands() - 1);
11311}

11313/// Assign the register class depending on the number of
11314/// bits set in the writemask
11315void SITargetLowering::AdjustInstrPostInstrSelection(MachineInstr &MI,
                                                   SDNode *Node) const {
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();

MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();

if (TII->isVOP3(MI.getOpcode())) {
  // Make sure constant bus requirements are respected.
  TII->legalizeOperandsVOP3(MRI, MI);

  // Prefer VGPRs over AGPRs in mAI instructions where possible.
  // This saves a chain-copy of registers and better ballance register
  // use between vgpr and agpr as agpr tuples tend to be big.
  if (const MCOperandInfo *OpInfo = MI.getDesc().OpInfo) {
    unsigned Opc = MI.getOpcode();
    const SIRegisterInfo *TRI = Subtarget->getRegisterInfo();
    for (auto I : { AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0),
                    AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1) }) {
      if (I == -1)
        break;
      MachineOperand &Op = MI.getOperand(I);
      if ((OpInfo[I].RegClass != llvm::AMDGPU::AV_64RegClassID &&
           OpInfo[I].RegClass != llvm::AMDGPU::AV_32RegClassID) ||
          !Op.getReg().isVirtual() || !TRI->isAGPR(MRI, Op.getReg()))
        continue;
      auto *Src = MRI.getUniqueVRegDef(Op.getReg());
      if (!Src || !Src->isCopy() ||
          !TRI->isSGPRReg(MRI, Src->getOperand(1).getReg()))
        continue;
      auto *RC = TRI->getRegClassForReg(MRI, Op.getReg());
      auto *NewRC = TRI->getEquivalentVGPRClass(RC);
      // All uses of agpr64 and agpr32 can also accept vgpr except for
      // v_accvgpr_read, but we do not produce agpr reads during selection,
      // so no use checks are needed.
      MRI.setRegClass(Op.getReg(), NewRC);
    }
  }

  return;
}

// Replace unused atomics with the no return version.
int NoRetAtomicOp = AMDGPU::getAtomicNoRetOp(MI.getOpcode());
if (NoRetAtomicOp != -1) {
  if (!Node->hasAnyUseOfValue(0)) {
    int CPolIdx = AMDGPU::getNamedOperandIdx(MI.getOpcode(),
                                             AMDGPU::OpName::cpol);
    if (CPolIdx != -1) {
      MachineOperand &CPol = MI.getOperand(CPolIdx);
      CPol.setImm(CPol.getImm() & ~AMDGPU::CPol::GLC);
    }
    MI.RemoveOperand(0);
    MI.setDesc(TII->get(NoRetAtomicOp));
    return;
  }

  // For mubuf_atomic_cmpswap, we need to have tablegen use an extract_subreg
  // instruction, because the return type of these instructions is a vec2 of
  // the memory type, so it can be tied to the input operand.
  // This means these instructions always have a use, so we need to add a
  // special case to check if the atomic has only one extract_subreg use,
  // which itself has no uses.
  if ((Node->hasNUsesOfValue(1, 0) &&
       Node->use_begin()->isMachineOpcode() &&
       Node->use_begin()->getMachineOpcode() == AMDGPU::EXTRACT_SUBREG &&
       !Node->use_begin()->hasAnyUseOfValue(0))) {
    Register Def = MI.getOperand(0).getReg();

    // Change this into a noret atomic.
    MI.setDesc(TII->get(NoRetAtomicOp));
    MI.RemoveOperand(0);

    // If we only remove the def operand from the atomic instruction, the
    // extract_subreg will be left with a use of a vreg without a def.
    // So we need to insert an implicit_def to avoid machine verifier
    // errors.
    BuildMI(*MI.getParent(), MI, MI.getDebugLoc(),
            TII->get(AMDGPU::IMPLICIT_DEF), Def);
  }
  return;
}

if (TII->isMIMG(MI) && !MI.mayStore())
  AddIMGInit(MI);
11399}

11401static SDValue buildSMovImm32(SelectionDAG &DAG, const SDLoc &DL,
                            uint64_t Val) {
SDValue K = DAG.getTargetConstant(Val, DL, MVT::i32);
return SDValue(DAG.getMachineNode(AMDGPU::S_MOV_B32, DL, MVT::i32, K), 0);
11405}

11407MachineSDNode *SITargetLowering::wrapAddr64Rsrc(SelectionDAG &DAG,
                                              const SDLoc &DL,
                                              SDValue Ptr) const {
const SIInstrInfo *TII = getSubtarget()->getInstrInfo();

// Build the half of the subregister with the constants before building the
// full 128-bit register. If we are building multiple resource descriptors,
// this will allow CSEing of the 2-component register.
const SDValue Ops0[] = {
  DAG.getTargetConstant(AMDGPU::SGPR_64RegClassID, DL, MVT::i32),
  buildSMovImm32(DAG, DL, 0),
  DAG.getTargetConstant(AMDGPU::sub0, DL, MVT::i32),
  buildSMovImm32(DAG, DL, TII->getDefaultRsrcDataFormat() >> 32),
  DAG.getTargetConstant(AMDGPU::sub1, DL, MVT::i32)
};

SDValue SubRegHi = SDValue(DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL,
                                              MVT::v2i32, Ops0), 0);

// Combine the constants and the pointer.
const SDValue Ops1[] = {
  DAG.getTargetConstant(AMDGPU::SGPR_128RegClassID, DL, MVT::i32),
  Ptr,
  DAG.getTargetConstant(AMDGPU::sub0_sub1, DL, MVT::i32),
  SubRegHi,
  DAG.getTargetConstant(AMDGPU::sub2_sub3, DL, MVT::i32)
};

return DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL, MVT::v4i32, Ops1);
11436}

11438/// Return a resource descriptor with the 'Add TID' bit enabled
11439///        The TID (Thread ID) is multiplied by the stride value (bits [61:48]
11440///        of the resource descriptor) to create an offset, which is added to
11441///        the resource pointer.
11442MachineSDNode *SITargetLowering::buildRSRC(SelectionDAG &DAG, const SDLoc &DL,
                                         SDValue Ptr, uint32_t RsrcDword1,
                                         uint64_t RsrcDword2And3) const {
SDValue PtrLo = DAG.getTargetExtractSubreg(AMDGPU::sub0, DL, MVT::i32, Ptr);
SDValue PtrHi = DAG.getTargetExtractSubreg(AMDGPU::sub1, DL, MVT::i32, Ptr);
if (RsrcDword1) {
  PtrHi = SDValue(DAG.getMachineNode(AMDGPU::S_OR_B32, DL, MVT::i32, PtrHi,
                                   DAG.getConstant(RsrcDword1, DL, MVT::i32)),
                  0);
}

SDValue DataLo = buildSMovImm32(DAG, DL,
                                RsrcDword2And3 & UINT64_C(0xFFFFFFFF)0xFFFFFFFFULL);
SDValue DataHi = buildSMovImm32(DAG, DL, RsrcDword2And3 >> 32);

const SDValue Ops[] = {
  DAG.getTargetConstant(AMDGPU::SGPR_128RegClassID, DL, MVT::i32),
  PtrLo,
  DAG.getTargetConstant(AMDGPU::sub0, DL, MVT::i32),
  PtrHi,
  DAG.getTargetConstant(AMDGPU::sub1, DL, MVT::i32),
  DataLo,
  DAG.getTargetConstant(AMDGPU::sub2, DL, MVT::i32),
  DataHi,
  DAG.getTargetConstant(AMDGPU::sub3, DL, MVT::i32)
};

return DAG.getMachineNode(AMDGPU::REG_SEQUENCE, DL, MVT::v4i32, Ops);
11470}

11472//===----------------------------------------------------------------------===//
11473//                         SI Inline Assembly Support
11474//===----------------------------------------------------------------------===//

11476std::pair<unsigned, const TargetRegisterClass *>
11477SITargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI_,
                                             StringRef Constraint,
                                             MVT VT) const {
const SIRegisterInfo *TRI = static_cast<const SIRegisterInfo *>(TRI_);

const TargetRegisterClass *RC = nullptr;
if (Constraint.size() == 1) {
  const unsigned BitWidth = VT.getSizeInBits();
  switch (Constraint[0]) {
  default:
    return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
  case 's':
  case 'r':
    switch (BitWidth) {
    case 16:
      RC = &AMDGPU::SReg_32RegClass;
      break;
    case 64:
      RC = &AMDGPU::SGPR_64RegClass;
      break;
    default:
      RC = SIRegisterInfo::getSGPRClassForBitWidth(BitWidth);
      if (!RC)
        return std::make_pair(0U, nullptr);
      break;
    }
    break;
  case 'v':
    switch (BitWidth) {
    case 16:
      RC = &AMDGPU::VGPR_32RegClass;
      break;
    default:
      RC = TRI->getVGPRClassForBitWidth(BitWidth);
      if (!RC)
        return std::make_pair(0U, nullptr);
      break;
    }
    break;
  case 'a':
    if (!Subtarget->hasMAIInsts())
      break;
    switch (BitWidth) {
    case 16:
      RC = &AMDGPU::AGPR_32RegClass;
      break;
    default:
      RC = TRI->getAGPRClassForBitWidth(BitWidth);
      if (!RC)
        return std::make_pair(0U, nullptr);
      break;
    }
    break;
  }
  // We actually support i128, i16 and f16 as inline parameters
  // even if they are not reported as legal
  if (RC && (isTypeLegal(VT) || VT.SimpleTy == MVT::i128 ||
             VT.SimpleTy == MVT::i16 || VT.SimpleTy == MVT::f16))
    return std::make_pair(0U, RC);
}

if (Constraint.size() > 1) {
  if (Constraint[1] == 'v') {
    RC = &AMDGPU::VGPR_32RegClass;
  } else if (Constraint[1] == 's') {
    RC = &AMDGPU::SGPR_32RegClass;
  } else if (Constraint[1] == 'a') {
    RC = &AMDGPU::AGPR_32RegClass;
  }

  if (RC) {
    uint32_t Idx;
    bool Failed = Constraint.substr(2).getAsInteger(10, Idx);
    if (!Failed && Idx < RC->getNumRegs())
      return std::make_pair(RC->getRegister(Idx), RC);
  }
}

// FIXME: Returns VS_32 for physical SGPR constraints
return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
11557}

11559static bool isImmConstraint(StringRef Constraint) {
if (Constraint.size() == 1) {
  switch (Constraint[0]) {
  default: break;
  case 'I':
  case 'J':
  case 'A':
  case 'B':
  case 'C':
    return true;
  }
} else if (Constraint == "DA" ||
           Constraint == "DB") {
  return true;
}
return false;
11575}

11577SITargetLowering::ConstraintType
11578SITargetLowering::getConstraintType(StringRef Constraint) const {
if (Constraint.size() == 1) {
  switch (Constraint[0]) {
  default: break;
  case 's':
  case 'v':
  case 'a':
    return C_RegisterClass;
  }
}
if (isImmConstraint(Constraint)) {
  return C_Other;
}
return TargetLowering::getConstraintType(Constraint);
11592}

11594static uint64_t clearUnusedBits(uint64_t Val, unsigned Size) {
if (!AMDGPU::isInlinableIntLiteral(Val)) {
  Val = Val & maskTrailingOnes<uint64_t>(Size);
}
return Val;
11599}

11601void SITargetLowering::LowerAsmOperandForConstraint(SDValue Op,
                                                  std::string &Constraint,
                                                  std::vector<SDValue> &Ops,
                                                  SelectionDAG &DAG) const {
if (isImmConstraint(Constraint)) {
  uint64_t Val;
  if (getAsmOperandConstVal(Op, Val) &&
      checkAsmConstraintVal(Op, Constraint, Val)) {
    Val = clearUnusedBits(Val, Op.getScalarValueSizeInBits());
    Ops.push_back(DAG.getTargetConstant(Val, SDLoc(Op), MVT::i64));
  }
} else {
  TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
}
11615}

11617bool SITargetLowering::getAsmOperandConstVal(SDValue Op, uint64_t &Val) const {
unsigned Size = Op.getScalarValueSizeInBits();
if (Size > 64)
  return false;

if (Size == 16 && !Subtarget->has16BitInsts())
  return false;

if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
  Val = C->getSExtValue();
  return true;
}
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op)) {
  Val = C->getValueAPF().bitcastToAPInt().getSExtValue();
  return true;
}
if (BuildVectorSDNode *V = dyn_cast<BuildVectorSDNode>(Op)) {
  if (Size != 16 || Op.getNumOperands() != 2)
    return false;
  if (Op.getOperand(0).isUndef() || Op.getOperand(1).isUndef())
    return false;
  if (ConstantSDNode *C = V->getConstantSplatNode()) {
    Val = C->getSExtValue();
    return true;
  }
  if (ConstantFPSDNode *C = V->getConstantFPSplatNode()) {
    Val = C->getValueAPF().bitcastToAPInt().getSExtValue();
    return true;
  }
}

return false;
11649}

11651bool SITargetLowering::checkAsmConstraintVal(SDValue Op,
                                           const std::string &Constraint,
                                           uint64_t Val) const {
if (Constraint.size() == 1) {
  switch (Constraint[0]) {
  case 'I':
    return AMDGPU::isInlinableIntLiteral(Val);
  case 'J':
    return isInt<16>(Val);
  case 'A':
    return checkAsmConstraintValA(Op, Val);
  case 'B':
    return isInt<32>(Val);
  case 'C':
    return isUInt<32>(clearUnusedBits(Val, Op.getScalarValueSizeInBits())) ||
           AMDGPU::isInlinableIntLiteral(Val);
  default:
    break;
  }
} else if (Constraint.size() == 2) {
  if (Constraint == "DA") {
    int64_t HiBits = static_cast<int32_t>(Val >> 32);
    int64_t LoBits = static_cast<int32_t>(Val);
    return checkAsmConstraintValA(Op, HiBits, 32) &&
           checkAsmConstraintValA(Op, LoBits, 32);
  }
  if (Constraint == "DB") {
    return true;
  }
}
llvm_unreachable("Invalid asm constraint")__builtin_unreachable();
11682}

11684bool SITargetLowering::checkAsmConstraintValA(SDValue Op,
                                            uint64_t Val,
                                            unsigned MaxSize) const {
unsigned Size = std::min<unsigned>(Op.getScalarValueSizeInBits(), MaxSize);
bool HasInv2Pi = Subtarget->hasInv2PiInlineImm();
if ((Size == 16 && AMDGPU::isInlinableLiteral16(Val, HasInv2Pi)) ||
    (Size == 32 && AMDGPU::isInlinableLiteral32(Val, HasInv2Pi)) ||
    (Size == 64 && AMDGPU::isInlinableLiteral64(Val, HasInv2Pi))) {
  return true;
}
return false;
11695}

11697static int getAlignedAGPRClassID(unsigned UnalignedClassID) {
switch (UnalignedClassID) {
case AMDGPU::VReg_64RegClassID:
  return AMDGPU::VReg_64_Align2RegClassID;
case AMDGPU::VReg_96RegClassID:
  return AMDGPU::VReg_96_Align2RegClassID;
case AMDGPU::VReg_128RegClassID:
  return AMDGPU::VReg_128_Align2RegClassID;
case AMDGPU::VReg_160RegClassID:
  return AMDGPU::VReg_160_Align2RegClassID;
case AMDGPU::VReg_192RegClassID:
  return AMDGPU::VReg_192_Align2RegClassID;
case AMDGPU::VReg_224RegClassID:
  return AMDGPU::VReg_224_Align2RegClassID;
case AMDGPU::VReg_256RegClassID:
  return AMDGPU::VReg_256_Align2RegClassID;
case AMDGPU::VReg_512RegClassID:
  return AMDGPU::VReg_512_Align2RegClassID;
case AMDGPU::VReg_1024RegClassID:
  return AMDGPU::VReg_1024_Align2RegClassID;
case AMDGPU::AReg_64RegClassID:
  return AMDGPU::AReg_64_Align2RegClassID;
case AMDGPU::AReg_96RegClassID:
  return AMDGPU::AReg_96_Align2RegClassID;
case AMDGPU::AReg_128RegClassID:
  return AMDGPU::AReg_128_Align2RegClassID;
case AMDGPU::AReg_160RegClassID:
  return AMDGPU::AReg_160_Align2RegClassID;
case AMDGPU::AReg_192RegClassID:
  return AMDGPU::AReg_192_Align2RegClassID;
case AMDGPU::AReg_256RegClassID:
  return AMDGPU::AReg_256_Align2RegClassID;
case AMDGPU::AReg_512RegClassID:
  return AMDGPU::AReg_512_Align2RegClassID;
case AMDGPU::AReg_1024RegClassID:
  return AMDGPU::AReg_1024_Align2RegClassID;
default:
  return -1;
}
11736}

11738// Figure out which registers should be reserved for stack access. Only after
11739// the function is legalized do we know all of the non-spill stack objects or if
11740// calls are present.
11741void SITargetLowering::finalizeLowering(MachineFunction &MF) const {
MachineRegisterInfo &MRI = MF.getRegInfo();
SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
const SIRegisterInfo *TRI = Subtarget->getRegisterInfo();
const SIInstrInfo *TII = ST.getInstrInfo();

if (Info->isEntryFunction()) {
  // Callable functions have fixed registers used for stack access.
  reservePrivateMemoryRegs(getTargetMachine(), MF, *TRI, *Info);
}

assert(!TRI->isSubRegister(Info->getScratchRSrcReg(),((void)0)
                           Info->getStackPtrOffsetReg()))((void)0);
if (Info->getStackPtrOffsetReg() != AMDGPU::SP_REG)
  MRI.replaceRegWith(AMDGPU::SP_REG, Info->getStackPtrOffsetReg());

// We need to worry about replacing the default register with itself in case
// of MIR testcases missing the MFI.
if (Info->getScratchRSrcReg() != AMDGPU::PRIVATE_RSRC_REG)
  MRI.replaceRegWith(AMDGPU::PRIVATE_RSRC_REG, Info->getScratchRSrcReg());

if (Info->getFrameOffsetReg() != AMDGPU::FP_REG)
  MRI.replaceRegWith(AMDGPU::FP_REG, Info->getFrameOffsetReg());

Info->limitOccupancy(MF);

if (ST.isWave32() && !MF.empty()) {
  for (auto &MBB : MF) {
    for (auto &MI : MBB) {
      TII->fixImplicitOperands(MI);
    }
  }
}

// FIXME: This is a hack to fixup AGPR classes to use the properly aligned
// classes if required. Ideally the register class constraints would differ
// per-subtarget, but there's no easy way to achieve that right now. This is
// not a problem for VGPRs because the correctly aligned VGPR class is implied
// from using them as the register class for legal types.
if (ST.needsAlignedVGPRs()) {
  for (unsigned I = 0, E = MRI.getNumVirtRegs(); I != E; ++I) {
    const Register Reg = Register::index2VirtReg(I);
    const TargetRegisterClass *RC = MRI.getRegClassOrNull(Reg);
    if (!RC)
      continue;
    int NewClassID = getAlignedAGPRClassID(RC->getID());
    if (NewClassID != -1)
      MRI.setRegClass(Reg, TRI->getRegClass(NewClassID));
  }
}

TargetLoweringBase::finalizeLowering(MF);

// Allocate a VGPR for future SGPR Spill if
// "amdgpu-reserve-vgpr-for-sgpr-spill" option is used
// FIXME: We won't need this hack if we split SGPR allocation from VGPR
if (VGPRReserveforSGPRSpill && TRI->spillSGPRToVGPR() &&
    !Info->VGPRReservedForSGPRSpill && !Info->isEntryFunction())
  Info->reserveVGPRforSGPRSpills(MF);
11801}

11803void SITargetLowering::computeKnownBitsForFrameIndex(
const int FI, KnownBits &Known, const MachineFunction &MF) const {
TargetLowering::computeKnownBitsForFrameIndex(FI, Known, MF);

// Set the high bits to zero based on the maximum allowed scratch size per
// wave. We can't use vaddr in MUBUF instructions if we don't know the address
// calculation won't overflow, so assume the sign bit is never set.
Known.Zero.setHighBits(getSubtarget()->getKnownHighZeroBitsForFrameIndex());
11811}

11813static void knownBitsForWorkitemID(const GCNSubtarget &ST, GISelKnownBits &KB,
                                 KnownBits &Known, unsigned Dim) {
unsigned MaxValue =
    ST.getMaxWorkitemID(KB.getMachineFunction().getFunction(), Dim);
Known.Zero.setHighBits(countLeadingZeros(MaxValue));
11818}

11820void SITargetLowering::computeKnownBitsForTargetInstr(
  GISelKnownBits &KB, Register R, KnownBits &Known, const APInt &DemandedElts,
  const MachineRegisterInfo &MRI, unsigned Depth) const {
const MachineInstr *MI = MRI.getVRegDef(R);
switch (MI->getOpcode()) {
case AMDGPU::G_INTRINSIC: {
  switch (MI->getIntrinsicID()) {
  case Intrinsic::amdgcn_workitem_id_x:
    knownBitsForWorkitemID(*getSubtarget(), KB, Known, 0);
    break;
  case Intrinsic::amdgcn_workitem_id_y:
    knownBitsForWorkitemID(*getSubtarget(), KB, Known, 1);
    break;
  case Intrinsic::amdgcn_workitem_id_z:
    knownBitsForWorkitemID(*getSubtarget(), KB, Known, 2);
    break;
  case Intrinsic::amdgcn_mbcnt_lo:
  case Intrinsic::amdgcn_mbcnt_hi: {
    // These return at most the wavefront size - 1.
    unsigned Size = MRI.getType(R).getSizeInBits();
    Known.Zero.setHighBits(Size - getSubtarget()->getWavefrontSizeLog2());
    break;
  }
  case Intrinsic::amdgcn_groupstaticsize: {
    // We can report everything over the maximum size as 0. We can't report
    // based on the actual size because we don't know if it's accurate or not
    // at any given point.
    Known.Zero.setHighBits(countLeadingZeros(getSubtarget()->getLocalMemorySize()));
    break;
  }
  }
  break;
}
case AMDGPU::G_AMDGPU_BUFFER_LOAD_UBYTE:
  Known.Zero.setHighBits(24);
  break;
case AMDGPU::G_AMDGPU_BUFFER_LOAD_USHORT:
  Known.Zero.setHighBits(16);
  break;
}
11860}

11862Align SITargetLowering::computeKnownAlignForTargetInstr(
GISelKnownBits &KB, Register R, const MachineRegisterInfo &MRI,
unsigned Depth) const {
const MachineInstr *MI = MRI.getVRegDef(R);
switch (MI->getOpcode()) {
case AMDGPU::G_INTRINSIC:
case AMDGPU::G_INTRINSIC_W_SIDE_EFFECTS: {
  // FIXME: Can this move to generic code? What about the case where the call
  // site specifies a lower alignment?
  Intrinsic::ID IID = MI->getIntrinsicID();
  LLVMContext &Ctx = KB.getMachineFunction().getFunction().getContext();
  AttributeList Attrs = Intrinsic::getAttributes(Ctx, IID);
  if (MaybeAlign RetAlign = Attrs.getRetAlignment())
    return *RetAlign;
  return Align(1);
}
default:
  return Align(1);
}
11881}

11883Align SITargetLowering::getPrefLoopAlignment(MachineLoop *ML) const {
const Align PrefAlign = TargetLowering::getPrefLoopAlignment(ML);
const Align CacheLineAlign = Align(64);

// Pre-GFX10 target did not benefit from loop alignment
if (!ML || DisableLoopAlignment ||
    (getSubtarget()->getGeneration() < AMDGPUSubtarget::GFX10) ||
    getSubtarget()->hasInstFwdPrefetchBug())
  return PrefAlign;

// On GFX10 I$ is 4 x 64 bytes cache lines.
// By default prefetcher keeps one cache line behind and reads two ahead.
// We can modify it with S_INST_PREFETCH for larger loops to have two lines
// behind and one ahead.
// Therefor we can benefit from aligning loop headers if loop fits 192 bytes.
// If loop fits 64 bytes it always spans no more than two cache lines and
// does not need an alignment.
// Else if loop is less or equal 128 bytes we do not need to modify prefetch,
// Else if loop is less or equal 192 bytes we need two lines behind.

const SIInstrInfo *TII = getSubtarget()->getInstrInfo();
const MachineBasicBlock *Header = ML->getHeader();
if (Header->getAlignment() != PrefAlign)
  return Header->getAlignment(); // Already processed.

unsigned LoopSize = 0;
for (const MachineBasicBlock *MBB : ML->blocks()) {
  // If inner loop block is aligned assume in average half of the alignment
  // size to be added as nops.
  if (MBB != Header)
    LoopSize += MBB->getAlignment().value() / 2;

  for (const MachineInstr &MI : *MBB) {
    LoopSize += TII->getInstSizeInBytes(MI);
    if (LoopSize > 192)
      return PrefAlign;
  }
}

if (LoopSize <= 64)
  return PrefAlign;

if (LoopSize <= 128)
  return CacheLineAlign;

// If any of parent loops is surrounded by prefetch instructions do not
// insert new for inner loop, which would reset parent's settings.
for (MachineLoop *P = ML->getParentLoop(); P; P = P->getParentLoop()) {
  if (MachineBasicBlock *Exit = P->getExitBlock()) {
    auto I = Exit->getFirstNonDebugInstr();
    if (I != Exit->end() && I->getOpcode() == AMDGPU::S_INST_PREFETCH)
      return CacheLineAlign;
  }
}

MachineBasicBlock *Pre = ML->getLoopPreheader();
MachineBasicBlock *Exit = ML->getExitBlock();

if (Pre && Exit) {
  BuildMI(*Pre, Pre->getFirstTerminator(), DebugLoc(),
          TII->get(AMDGPU::S_INST_PREFETCH))
    .addImm(1); // prefetch 2 lines behind PC

  BuildMI(*Exit, Exit->getFirstNonDebugInstr(), DebugLoc(),
          TII->get(AMDGPU::S_INST_PREFETCH))
    .addImm(2); // prefetch 1 line behind PC
}

return CacheLineAlign;
11952}

11954LLVM_ATTRIBUTE_UNUSED__attribute__((__unused__))
11955static bool isCopyFromRegOfInlineAsm(const SDNode *N) {
assert(N->getOpcode() == ISD::CopyFromReg)((void)0);
do {
  // Follow the chain until we find an INLINEASM node.
  N = N->getOperand(0).getNode();
  if (N->getOpcode() == ISD::INLINEASM ||
      N->getOpcode() == ISD::INLINEASM_BR)
    return true;
} while (N->getOpcode() == ISD::CopyFromReg);
return false;
11965}

11967bool SITargetLowering::isSDNodeSourceOfDivergence(
  const SDNode *N, FunctionLoweringInfo *FLI,
  LegacyDivergenceAnalysis *KDA) const {
switch (N->getOpcode()) {
case ISD::CopyFromReg: {
  const RegisterSDNode *R = cast<RegisterSDNode>(N->getOperand(1));
  const MachineRegisterInfo &MRI = FLI->MF->getRegInfo();
  const SIRegisterInfo *TRI = Subtarget->getRegisterInfo();
  Register Reg = R->getReg();

  // FIXME: Why does this need to consider isLiveIn?
  if (Reg.isPhysical() || MRI.isLiveIn(Reg))
    return !TRI->isSGPRReg(MRI, Reg);

  if (const Value *V = FLI->getValueFromVirtualReg(R->getReg()))
    return KDA->isDivergent(V);

  assert(Reg == FLI->DemoteRegister || isCopyFromRegOfInlineAsm(N))((void)0);
  return !TRI->isSGPRReg(MRI, Reg);
}
case ISD::LOAD: {
  const LoadSDNode *L = cast<LoadSDNode>(N);
  unsigned AS = L->getAddressSpace();
  // A flat load may access private memory.
  return AS == AMDGPUAS::PRIVATE_ADDRESS || AS == AMDGPUAS::FLAT_ADDRESS;
}
case ISD::CALLSEQ_END:
  return true;
case ISD::INTRINSIC_WO_CHAIN:
  return AMDGPU::isIntrinsicSourceOfDivergence(
      cast<ConstantSDNode>(N->getOperand(0))->getZExtValue());
case ISD::INTRINSIC_W_CHAIN:
  return AMDGPU::isIntrinsicSourceOfDivergence(
      cast<ConstantSDNode>(N->getOperand(1))->getZExtValue());
case AMDGPUISD::ATOMIC_CMP_SWAP:
case AMDGPUISD::ATOMIC_INC:
case AMDGPUISD::ATOMIC_DEC:
case AMDGPUISD::ATOMIC_LOAD_FMIN:
case AMDGPUISD::ATOMIC_LOAD_FMAX:
case AMDGPUISD::BUFFER_ATOMIC_SWAP:
case AMDGPUISD::BUFFER_ATOMIC_ADD:
case AMDGPUISD::BUFFER_ATOMIC_SUB:
case AMDGPUISD::BUFFER_ATOMIC_SMIN:
case AMDGPUISD::BUFFER_ATOMIC_UMIN:
case AMDGPUISD::BUFFER_ATOMIC_SMAX:
case AMDGPUISD::BUFFER_ATOMIC_UMAX:
case AMDGPUISD::BUFFER_ATOMIC_AND:
case AMDGPUISD::BUFFER_ATOMIC_OR:
case AMDGPUISD::BUFFER_ATOMIC_XOR:
case AMDGPUISD::BUFFER_ATOMIC_INC:
case AMDGPUISD::BUFFER_ATOMIC_DEC:
case AMDGPUISD::BUFFER_ATOMIC_CMPSWAP:
case AMDGPUISD::BUFFER_ATOMIC_CSUB:
case AMDGPUISD::BUFFER_ATOMIC_FADD:
case AMDGPUISD::BUFFER_ATOMIC_FMIN:
case AMDGPUISD::BUFFER_ATOMIC_FMAX:
  // Target-specific read-modify-write atomics are sources of divergence.
  return true;
default:
  if (auto *A = dyn_cast<AtomicSDNode>(N)) {
    // Generic read-modify-write atomics are sources of divergence.
    return A->readMem() && A->writeMem();
  }
  return false;
}
12032}

12034bool SITargetLowering::denormalsEnabledForType(const SelectionDAG &DAG,
                                             EVT VT) const {
switch (VT.getScalarType().getSimpleVT().SimpleTy) {
case MVT::f32:
  return hasFP32Denormals(DAG.getMachineFunction());
case MVT::f64:
case MVT::f16:
  return hasFP64FP16Denormals(DAG.getMachineFunction());
default:
  return false;
}
12045}

12047bool SITargetLowering::denormalsEnabledForType(LLT Ty,
                                             MachineFunction &MF) const {
switch (Ty.getScalarSizeInBits()) {
case 32:
  return hasFP32Denormals(MF);
case 64:
case 16:
  return hasFP64FP16Denormals(MF);
default:
  return false;
}
12058}

12060bool SITargetLowering::isKnownNeverNaNForTargetNode(SDValue Op,
                                                  const SelectionDAG &DAG,
                                                  bool SNaN,
                                                  unsigned Depth) const {
if (Op.getOpcode() == AMDGPUISD::CLAMP) {
  const MachineFunction &MF = DAG.getMachineFunction();
  const SIMachineFunctionInfo *Info = MF.getInfo<SIMachineFunctionInfo>();

  if (Info->getMode().DX10Clamp)
    return true; // Clamped to 0.
  return DAG.isKnownNeverNaN(Op.getOperand(0), SNaN, Depth + 1);
}

return AMDGPUTargetLowering::isKnownNeverNaNForTargetNode(Op, DAG,
                                                          SNaN, Depth);
12075}

12077// Global FP atomic instructions have a hardcoded FP mode and do not support
12078// FP32 denormals, and only support v2f16 denormals.
12079static bool fpModeMatchesGlobalFPAtomicMode(const AtomicRMWInst *RMW) {
const fltSemantics &Flt = RMW->getType()->getScalarType()->getFltSemantics();
auto DenormMode = RMW->getParent()->getParent()->getDenormalMode(Flt);
if (&Flt == &APFloat::IEEEsingle())
  return DenormMode == DenormalMode::getPreserveSign();
return DenormMode == DenormalMode::getIEEE();
12085}

12087TargetLowering::AtomicExpansionKind
12088SITargetLowering::shouldExpandAtomicRMWInIR(AtomicRMWInst *RMW) const {
switch (RMW->getOperation()) {
case AtomicRMWInst::FAdd: {
  Type *Ty = RMW->getType();

  // We don't have a way to support 16-bit atomics now, so just leave them
  // as-is.
  if (Ty->isHalfTy())
    return AtomicExpansionKind::None;

  if (!Ty->isFloatTy() && (!Subtarget->hasGFX90AInsts() || !Ty->isDoubleTy()))
    return AtomicExpansionKind::CmpXChg;

  unsigned AS = RMW->getPointerAddressSpace();

  if ((AS == AMDGPUAS::GLOBAL_ADDRESS || AS == AMDGPUAS::FLAT_ADDRESS) &&
       Subtarget->hasAtomicFaddInsts()) {
    // The amdgpu-unsafe-fp-atomics attribute enables generation of unsafe
    // floating point atomic instructions. May generate more efficient code,
    // but may not respect rounding and denormal modes, and may give incorrect
    // results for certain memory destinations.
    if (RMW->getFunction()
            ->getFnAttribute("amdgpu-unsafe-fp-atomics")
            .getValueAsString() != "true")
      return AtomicExpansionKind::CmpXChg;

    if (Subtarget->hasGFX90AInsts()) {
      if (Ty->isFloatTy() && AS == AMDGPUAS::FLAT_ADDRESS)
        return AtomicExpansionKind::CmpXChg;

      auto SSID = RMW->getSyncScopeID();
      if (SSID == SyncScope::System ||
          SSID == RMW->getContext().getOrInsertSyncScopeID("one-as"))
        return AtomicExpansionKind::CmpXChg;

      return AtomicExpansionKind::None;
    }

    if (AS == AMDGPUAS::FLAT_ADDRESS)
      return AtomicExpansionKind::CmpXChg;

    return RMW->use_empty() ? AtomicExpansionKind::None
                            : AtomicExpansionKind::CmpXChg;
  }

  // DS FP atomics do repect the denormal mode, but the rounding mode is fixed
  // to round-to-nearest-even.
  // The only exception is DS_ADD_F64 which never flushes regardless of mode.
  if (AS == AMDGPUAS::LOCAL_ADDRESS && Subtarget->hasLDSFPAtomics()) {
    if (!Ty->isDoubleTy())
      return AtomicExpansionKind::None;

    return (fpModeMatchesGlobalFPAtomicMode(RMW) ||
            RMW->getFunction()
                    ->getFnAttribute("amdgpu-unsafe-fp-atomics")
                    .getValueAsString() == "true")
               ? AtomicExpansionKind::None
               : AtomicExpansionKind::CmpXChg;
  }

  return AtomicExpansionKind::CmpXChg;
}
default:
  break;
}

return AMDGPUTargetLowering::shouldExpandAtomicRMWInIR(RMW);
12155}

12157const TargetRegisterClass *
12158SITargetLowering::getRegClassFor(MVT VT, bool isDivergent) const {
const TargetRegisterClass *RC = TargetLoweringBase::getRegClassFor(VT, false);
const SIRegisterInfo *TRI = Subtarget->getRegisterInfo();
if (RC == &AMDGPU::VReg_1RegClass && !isDivergent)
  return Subtarget->getWavefrontSize() == 64 ? &AMDGPU::SReg_64RegClass
                                             : &AMDGPU::SReg_32RegClass;
if (!TRI->isSGPRClass(RC) && !isDivergent)
  return TRI->getEquivalentSGPRClass(RC);
else if (TRI->isSGPRClass(RC) && isDivergent)
  return TRI->getEquivalentVGPRClass(RC);

return RC;
12170}

12172// FIXME: This is a workaround for DivergenceAnalysis not understanding always
12173// uniform values (as produced by the mask results of control flow intrinsics)
12174// used outside of divergent blocks. The phi users need to also be treated as
12175// always uniform.
12176static bool hasCFUser(const Value *V, SmallPtrSet<const Value *, 16> &Visited,
                    unsigned WaveSize) {
// FIXME: We asssume we never cast the mask results of a control flow
// intrinsic.
// Early exit if the type won't be consistent as a compile time hack.
IntegerType *IT = dyn_cast<IntegerType>(V->getType());
if (!IT || IT->getBitWidth() != WaveSize)
  return false;

if (!isa<Instruction>(V))
  return false;
if (!Visited.insert(V).second)
  return false;
bool Result = false;
for (auto U : V->users()) {
  if (const IntrinsicInst *Intrinsic = dyn_cast<IntrinsicInst>(U)) {
    if (V == U->getOperand(1)) {
      switch (Intrinsic->getIntrinsicID()) {
      default:
        Result = false;
        break;
      case Intrinsic::amdgcn_if_break:
      case Intrinsic::amdgcn_if:
      case Intrinsic::amdgcn_else:
        Result = true;
        break;
      }
    }
    if (V == U->getOperand(0)) {
      switch (Intrinsic->getIntrinsicID()) {
      default:
        Result = false;
        break;
      case Intrinsic::amdgcn_end_cf:
      case Intrinsic::amdgcn_loop:
        Result = true;
        break;
      }
    }
  } else {
    Result = hasCFUser(U, Visited, WaveSize);
  }
  if (Result)
    break;
}
return Result;
12222}

12224bool SITargetLowering::requiresUniformRegister(MachineFunction &MF,
                                             const Value *V) const {
if (const CallInst *CI = dyn_cast<CallInst>(V)) {
  if (CI->isInlineAsm()) {
    // FIXME: This cannot give a correct answer. This should only trigger in
    // the case where inline asm returns mixed SGPR and VGPR results, used
    // outside the defining block. We don't have a specific result to
    // consider, so this assumes if any value is SGPR, the overall register
    // also needs to be SGPR.
    const SIRegisterInfo *SIRI = Subtarget->getRegisterInfo();
    TargetLowering::AsmOperandInfoVector TargetConstraints = ParseConstraints(
        MF.getDataLayout(), Subtarget->getRegisterInfo(), *CI);
    for (auto &TC : TargetConstraints) {
      if (TC.Type == InlineAsm::isOutput) {
        ComputeConstraintToUse(TC, SDValue());
        unsigned AssignedReg;
        const TargetRegisterClass *RC;
        std::tie(AssignedReg, RC) = getRegForInlineAsmConstraint(
            SIRI, TC.ConstraintCode, TC.ConstraintVT);
        if (RC) {
          MachineRegisterInfo &MRI = MF.getRegInfo();
          if (AssignedReg != 0 && SIRI->isSGPRReg(MRI, AssignedReg))
            return true;
          else if (SIRI->isSGPRClass(RC))
            return true;
        }
      }
    }
  }
}
SmallPtrSet<const Value *, 16> Visited;
return hasCFUser(V, Visited, Subtarget->getWavefrontSize());
12256}

12258std::pair<InstructionCost, MVT>
12259SITargetLowering::getTypeLegalizationCost(const DataLayout &DL,
                                        Type *Ty) const {
std::pair<InstructionCost, MVT> Cost =
    TargetLoweringBase::getTypeLegalizationCost(DL, Ty);
auto Size = DL.getTypeSizeInBits(Ty);
// Maximum load or store can handle 8 dwords for scalar and 4 for
// vector ALU. Let's assume anything above 8 dwords is expensive
// even if legal.
if (Size <= 256)
  return Cost;

Cost.first = (Size + 255) / 256;
return Cost;
12272}

←

/usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/Support/Casting.h

→

1//===- llvm/Support/Casting.h - Allow flexible, checked, casts --*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the isa<X>(), cast<X>(), dyn_cast<X>(), cast_or_null<X>(),
10// and dyn_cast_or_null<X>() templates.
11//
12//===----------------------------------------------------------------------===//
13 
14#ifndef LLVM_SUPPORT_CASTING_H
15#define LLVM_SUPPORT_CASTING_H
16 
17#include "llvm/Support/Compiler.h"
18#include "llvm/Support/type_traits.h"
19#include <cassert>
20#include <memory>
21#include <type_traits>
22 
23namespace llvm {
24 
25//===----------------------------------------------------------------------===//
26//                          isa<x> Support Templates
27//===----------------------------------------------------------------------===//
28 
29// Define a template that can be specialized by smart pointers to reflect the
30// fact that they are automatically dereferenced, and are not involved with the
31// template selection process...  the default implementation is a noop.
32//
33template<typename From> struct simplify_type {
34  using SimpleType = From; // The real type this represents...
35 
36  // An accessor to get the real value...
37  static SimpleType &getSimplifiedValue(From &Val) { return Val; }
38};
39 
40template<typename From> struct simplify_type<const From> {
41  using NonConstSimpleType = typename simplify_type<From>::SimpleType;
42  using SimpleType =
43      typename add_const_past_pointer<NonConstSimpleType>::type;
44  using RetType =
45      typename add_lvalue_reference_if_not_pointer<SimpleType>::type;
46 
47  static RetType getSimplifiedValue(const From& Val) {
48    return simplify_type<From>::getSimplifiedValue(const_cast<From&>(Val));
49  }
50};
51 
52// The core of the implementation of isa<X> is here; To and From should be
53// the names of classes.  This template can be specialized to customize the
54// implementation of isa<> without rewriting it from scratch.
55template <typename To, typename From, typename Enabler = void>
56struct isa_impl {
57  static inline bool doit(const From &Val) {
58    return To::classof(&Val);
59  }
60};
61 
62/// Always allow upcasts, and perform no dynamic check for them.
63template <typename To, typename From>
64struct isa_impl<To, From, std::enable_if_t<std::is_base_of<To, From>::value>> {
65  static inline bool doit(const From &) { return true; }
66};
67 
68template <typename To, typename From> struct isa_impl_cl {
69  static inline bool doit(const From &Val) {
70    return isa_impl<To, From>::doit(Val);
71  }
72};
73 
74template <typename To, typename From> struct isa_impl_cl<To, const From> {
75  static inline bool doit(const From &Val) {
76    return isa_impl<To, From>::doit(Val);
77  }
78};
79 
80template <typename To, typename From>
81struct isa_impl_cl<To, const std::unique_ptr<From>> {
82  static inline bool doit(const std::unique_ptr<From> &Val) {
83    assert(Val && "isa<> used on a null pointer")((void)0);
84    return isa_impl_cl<To, From>::doit(*Val);
85  }
86};
87 
88template <typename To, typename From> struct isa_impl_cl<To, From*> {
89  static inline bool doit(const From *Val) {
90    assert(Val && "isa<> used on a null pointer")((void)0);
91    return isa_impl<To, From>::doit(*Val);
92  }
93};
94 
95template <typename To, typename From> struct isa_impl_cl<To, From*const> {
96  static inline bool doit(const From *Val) {
97    assert(Val && "isa<> used on a null pointer")((void)0);
98    return isa_impl<To, From>::doit(*Val);
99  }
100};
101 
102template <typename To, typename From> struct isa_impl_cl<To, const From*> {
103  static inline bool doit(const From *Val) {
104    assert(Val && "isa<> used on a null pointer")((void)0);
105    return isa_impl<To, From>::doit(*Val);
106  }
107};
108 
109template <typename To, typename From> struct isa_impl_cl<To, const From*const> {
110  static inline bool doit(const From *Val) {
111    assert(Val && "isa<> used on a null pointer")((void)0);
112    return isa_impl<To, From>::doit(*Val);
113  }
114};
115 
116template<typename To, typename From, typename SimpleFrom>
117struct isa_impl_wrap {
118  // When From != SimplifiedType, we can simplify the type some more by using
119  // the simplify_type template.
120  static bool doit(const From &Val) {
121    return isa_impl_wrap<To, SimpleFrom,
122      typename simplify_type<SimpleFrom>::SimpleType>::doit(
123                          simplify_type<const From>::getSimplifiedValue(Val));
124  }
125};
126 
127template<typename To, typename FromTy>
128struct isa_impl_wrap<To, FromTy, FromTy> {
129  // When From == SimpleType, we are as simple as we are going to get.
130  static bool doit(const FromTy &Val) {
131    return isa_impl_cl<To,FromTy>::doit(Val);
132  }
133};
134 
135// isa<X> - Return true if the parameter to the template is an instance of one
136// of the template type arguments.  Used like this:
137//
138//  if (isa<Type>(myVal)) { ... }
139//  if (isa<Type0, Type1, Type2>(myVal)) { ... }
140//
141template <class X, class Y> LLVM_NODISCARD[[clang::warn_unused_result]] inline bool isa(const Y &Val) {
142  return isa_impl_wrap<X, const Y,
143                       typename simplify_type<const Y>::SimpleType>::doit(Val);
144}
145 
146template <typename First, typename Second, typename... Rest, typename Y>
147LLVM_NODISCARD[[clang::warn_unused_result]] inline bool isa(const Y &Val) {
148  return isa<First>(Val) || isa<Second, Rest...>(Val);
149}
150 
151// isa_and_nonnull<X> - Functionally identical to isa, except that a null value
152// is accepted.
153//
154template <typename... X, class Y>
155LLVM_NODISCARD[[clang::warn_unused_result]] inline bool isa_and_nonnull(const Y &Val) {
156  if (!Val)
157    return false;
158  return isa<X...>(Val);
159}
160 
161//===----------------------------------------------------------------------===//
162//                          cast<x> Support Templates
163//===----------------------------------------------------------------------===//
164 
165template<class To, class From> struct cast_retty;
166 
167// Calculate what type the 'cast' function should return, based on a requested
168// type of To and a source type of From.
169template<class To, class From> struct cast_retty_impl {
170  using ret_type = To &;       // Normal case, return Ty&
171};
172template<class To, class From> struct cast_retty_impl<To, const From> {
173  using ret_type = const To &; // Normal case, return Ty&
174};
175 
176template<class To, class From> struct cast_retty_impl<To, From*> {
177  using ret_type = To *;       // Pointer arg case, return Ty*
178};
179 
180template<class To, class From> struct cast_retty_impl<To, const From*> {
181  using ret_type = const To *; // Constant pointer arg case, return const Ty*
182};
183 
184template<class To, class From> struct cast_retty_impl<To, const From*const> {
185  using ret_type = const To *; // Constant pointer arg case, return const Ty*
186};
187 
188template <class To, class From>
189struct cast_retty_impl<To, std::unique_ptr<From>> {
190private:
191  using PointerType = typename cast_retty_impl<To, From *>::ret_type;
192  using ResultType = std::remove_pointer_t<PointerType>;
193 
194public:
195  using ret_type = std::unique_ptr<ResultType>;
196};
197 
198template<class To, class From, class SimpleFrom>
199struct cast_retty_wrap {
200  // When the simplified type and the from type are not the same, use the type
201  // simplifier to reduce the type, then reuse cast_retty_impl to get the
202  // resultant type.
203  using ret_type = typename cast_retty<To, SimpleFrom>::ret_type;
204};
205 
206template<class To, class FromTy>
207struct cast_retty_wrap<To, FromTy, FromTy> {
208  // When the simplified type is equal to the from type, use it directly.
209  using ret_type = typename cast_retty_impl<To,FromTy>::ret_type;
210};
211 
212template<class To, class From>
213struct cast_retty {
214  using ret_type = typename cast_retty_wrap<
215      To, From, typename simplify_type<From>::SimpleType>::ret_type;
216};
217 
218// Ensure the non-simple values are converted using the simplify_type template
219// that may be specialized by smart pointers...
220//
221template<class To, class From, class SimpleFrom> struct cast_convert_val {
222  // This is not a simple type, use the template to simplify it...
223  static typename cast_retty<To, From>::ret_type doit(From &Val) {
224    return cast_convert_val<To, SimpleFrom,
15
←
Returning without writing to 'Val.Node'→
225      typename simplify_type<SimpleFrom>::SimpleType>::doit(
226                          simplify_type<From>::getSimplifiedValue(Val));
12
←
Calling 'simplify_type::getSimplifiedValue'→
14
←
Returning from 'simplify_type::getSimplifiedValue'→
227  }
228};
229 
230template<class To, class FromTy> struct cast_convert_val<To,FromTy,FromTy> {
231  // This _is_ a simple type, just cast it.
232  static typename cast_retty<To, FromTy>::ret_type doit(const FromTy &Val) {
233    typename cast_retty<To, FromTy>::ret_type Res2
234     = (typename cast_retty<To, FromTy>::ret_type)const_cast<FromTy&>(Val);
235    return Res2;
236  }
237};
238 
239template <class X> struct is_simple_type {
240  static const bool value =
241      std::is_same<X, typename simplify_type<X>::SimpleType>::value;
242};
243 
244// cast<X> - Return the argument parameter cast to the specified type.  This
245// casting operator asserts that the type is correct, so it does not return null
246// on failure.  It does not allow a null argument (use cast_or_null for that).
247// It is typically used like this:
248//
249//  cast<Instruction>(myVal)->getParent()
250//
251template <class X, class Y>
252inline std::enable_if_t<!is_simple_type<Y>::value,
253                        typename cast_retty<X, const Y>::ret_type>
254cast(const Y &Val) {
255  assert(isa<X>(Val) && "cast<Ty>() argument of incompatible type!")((void)0);
256  return cast_convert_val<
257      X, const Y, typename simplify_type<const Y>::SimpleType>::doit(Val);
258}
259 
260template <class X, class Y>
261inline typename cast_retty<X, Y>::ret_type cast(Y &Val) {
262  assert(isa<X>(Val) && "cast<Ty>() argument of incompatible type!")((void)0);
263  return cast_convert_val<X, Y,
11
←
Calling 'cast_convert_val::doit'→
16
←
Returning from 'cast_convert_val::doit'→
17
←
Returning without writing to 'Val.Node'→
264                          typename simplify_type<Y>::SimpleType>::doit(Val);
265}
266 
267template <class X, class Y>
268inline typename cast_retty<X, Y *>::ret_type cast(Y *Val) {
269  assert(isa<X>(Val) && "cast<Ty>() argument of incompatible type!")((void)0);
270  return cast_convert_val<X, Y*,
271                          typename simplify_type<Y*>::SimpleType>::doit(Val);
272}
273 
274template <class X, class Y>
275inline typename cast_retty<X, std::unique_ptr<Y>>::ret_type
276cast(std::unique_ptr<Y> &&Val) {
277  assert(isa<X>(Val.get()) && "cast<Ty>() argument of incompatible type!")((void)0);
278  using ret_type = typename cast_retty<X, std::unique_ptr<Y>>::ret_type;
279  return ret_type(
280      cast_convert_val<X, Y *, typename simplify_type<Y *>::SimpleType>::doit(
281          Val.release()));
282}
283 
284// cast_or_null<X> - Functionally identical to cast, except that a null value is
285// accepted.
286//
287template <class X, class Y>
288LLVM_NODISCARD[[clang::warn_unused_result]] inline std::enable_if_t<
289    !is_simple_type<Y>::value, typename cast_retty<X, const Y>::ret_type>
290cast_or_null(const Y &Val) {
291  if (!Val)
292    return nullptr;
293  assert(isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!")((void)0);
294  return cast<X>(Val);
295}
296 
297template <class X, class Y>
298LLVM_NODISCARD[[clang::warn_unused_result]] inline std::enable_if_t<!is_simple_type<Y>::value,
299                                       typename cast_retty<X, Y>::ret_type>
300cast_or_null(Y &Val) {
301  if (!Val)
302    return nullptr;
303  assert(isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!")((void)0);
304  return cast<X>(Val);
305}
306 
307template <class X, class Y>
308LLVM_NODISCARD[[clang::warn_unused_result]] inline typename cast_retty<X, Y *>::ret_type
309cast_or_null(Y *Val) {
310  if (!Val) return nullptr;
311  assert(isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!")((void)0);
312  return cast<X>(Val);
313}
314 
315template <class X, class Y>
316inline typename cast_retty<X, std::unique_ptr<Y>>::ret_type
317cast_or_null(std::unique_ptr<Y> &&Val) {
318  if (!Val)
319    return nullptr;
320  return cast<X>(std::move(Val));
321}
322 
323// dyn_cast<X> - Return the argument parameter cast to the specified type.  This
324// casting operator returns null if the argument is of the wrong type, so it can
325// be used to test for a type as well as cast if successful.  This should be
326// used in the context of an if statement like this:
327//
328//  if (const Instruction *I = dyn_cast<Instruction>(myVal)) { ... }
329//
330 
331template <class X, class Y>
332LLVM_NODISCARD[[clang::warn_unused_result]] inline std::enable_if_t<
333    !is_simple_type<Y>::value, typename cast_retty<X, const Y>::ret_type>
334dyn_cast(const Y &Val) {
335  return isa<X>(Val) ? cast<X>(Val) : nullptr;
336}
337 
338template <class X, class Y>
339LLVM_NODISCARD[[clang::warn_unused_result]] inline typename cast_retty<X, Y>::ret_type dyn_cast(Y &Val) {
340  return isa<X>(Val) ? cast<X>(Val) : nullptr;
8
←
Assuming 'Val' is a 'ConstantSDNode'→
9
←
'?' condition is true→
10
←
Calling 'cast<llvm::ConstantSDNode, llvm::SDValue>'→
18
←
Returning from 'cast<llvm::ConstantSDNode, llvm::SDValue>'→
19
←
Returning without writing to 'Val.Node'→
341}
342 
343template <class X, class Y>
344LLVM_NODISCARD[[clang::warn_unused_result]] inline typename cast_retty<X, Y *>::ret_type dyn_cast(Y *Val) {
345  return isa<X>(Val) ? cast<X>(Val) : nullptr;
346}
347 
348// dyn_cast_or_null<X> - Functionally identical to dyn_cast, except that a null
349// value is accepted.
350//
351template <class X, class Y>
352LLVM_NODISCARD[[clang::warn_unused_result]] inline std::enable_if_t<
353    !is_simple_type<Y>::value, typename cast_retty<X, const Y>::ret_type>
354dyn_cast_or_null(const Y &Val) {
355  return (Val && isa<X>(Val)) ? cast<X>(Val) : nullptr;
356}
357 
358template <class X, class Y>
359LLVM_NODISCARD[[clang::warn_unused_result]] inline std::enable_if_t<!is_simple_type<Y>::value,
360                                       typename cast_retty<X, Y>::ret_type>
361dyn_cast_or_null(Y &Val) {
362  return (Val && isa<X>(Val)) ? cast<X>(Val) : nullptr;
363}
364 
365template <class X, class Y>
366LLVM_NODISCARD[[clang::warn_unused_result]] inline typename cast_retty<X, Y *>::ret_type
367dyn_cast_or_null(Y *Val) {
368  return (Val && isa<X>(Val)) ? cast<X>(Val) : nullptr;
369}
370 
371// unique_dyn_cast<X> - Given a unique_ptr<Y>, try to return a unique_ptr<X>,
372// taking ownership of the input pointer iff isa<X>(Val) is true.  If the
373// cast is successful, From refers to nullptr on exit and the casted value
374// is returned.  If the cast is unsuccessful, the function returns nullptr
375// and From is unchanged.
376template <class X, class Y>
377LLVM_NODISCARD[[clang::warn_unused_result]] inline auto unique_dyn_cast(std::unique_ptr<Y> &Val)
378    -> decltype(cast<X>(Val)) {
379  if (!isa<X>(Val))
380    return nullptr;
381  return cast<X>(std::move(Val));
382}
383 
384template <class X, class Y>
385LLVM_NODISCARD[[clang::warn_unused_result]] inline auto unique_dyn_cast(std::unique_ptr<Y> &&Val) {
386  return unique_dyn_cast<X, Y>(Val);
387}
388 
389// dyn_cast_or_null<X> - Functionally identical to unique_dyn_cast, except that
390// a null value is accepted.
391template <class X, class Y>
392LLVM_NODISCARD[[clang::warn_unused_result]] inline auto unique_dyn_cast_or_null(std::unique_ptr<Y> &Val)
393    -> decltype(cast<X>(Val)) {
394  if (!Val)
395    return nullptr;
396  return unique_dyn_cast<X, Y>(Val);
397}
398 
399template <class X, class Y>
400LLVM_NODISCARD[[clang::warn_unused_result]] inline auto unique_dyn_cast_or_null(std::unique_ptr<Y> &&Val) {
401  return unique_dyn_cast_or_null<X, Y>(Val);
402}
403 
404} // end namespace llvm
405 
406#endif // LLVM_SUPPORT_CASTING_H

←

/usr/src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/include/llvm/CodeGen/SelectionDAGNodes.h

1//===- llvm/CodeGen/SelectionDAGNodes.h - SelectionDAG Nodes ----*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file declares the SDNode class and derived classes, which are used to
10// represent the nodes and operations present in a SelectionDAG.  These nodes
11// and operations are machine code level operations, with some similarities to
12// the GCC RTL representation.
13//
14// Clients should include the SelectionDAG.h file instead of this file directly.
15//
16//===----------------------------------------------------------------------===//

18#ifndef LLVM_CODEGEN_SELECTIONDAGNODES_H
19#define LLVM_CODEGEN_SELECTIONDAGNODES_H

21#include "llvm/ADT/APFloat.h"
22#include "llvm/ADT/ArrayRef.h"
23#include "llvm/ADT/BitVector.h"
24#include "llvm/ADT/FoldingSet.h"
25#include "llvm/ADT/GraphTraits.h"
26#include "llvm/ADT/SmallPtrSet.h"
27#include "llvm/ADT/SmallVector.h"
28#include "llvm/ADT/ilist_node.h"
29#include "llvm/ADT/iterator.h"
30#include "llvm/ADT/iterator_range.h"
31#include "llvm/CodeGen/ISDOpcodes.h"
32#include "llvm/CodeGen/MachineMemOperand.h"
33#include "llvm/CodeGen/Register.h"
34#include "llvm/CodeGen/ValueTypes.h"
35#include "llvm/IR/Constants.h"
36#include "llvm/IR/DebugLoc.h"
37#include "llvm/IR/Instruction.h"
38#include "llvm/IR/Instructions.h"
39#include "llvm/IR/Metadata.h"
40#include "llvm/IR/Operator.h"
41#include "llvm/Support/AlignOf.h"
42#include "llvm/Support/AtomicOrdering.h"
43#include "llvm/Support/Casting.h"
44#include "llvm/Support/ErrorHandling.h"
45#include "llvm/Support/MachineValueType.h"
46#include "llvm/Support/TypeSize.h"
47#include <algorithm>
48#include <cassert>
49#include <climits>
50#include <cstddef>
51#include <cstdint>
52#include <cstring>
53#include <iterator>
54#include <string>
55#include <tuple>

57namespace llvm {

59class APInt;
60class Constant;
61template <typename T> struct DenseMapInfo;
62class GlobalValue;
63class MachineBasicBlock;
64class MachineConstantPoolValue;
65class MCSymbol;
66class raw_ostream;
67class SDNode;
68class SelectionDAG;
69class Type;
70class Value;

72void checkForCycles(const SDNode *N, const SelectionDAG *DAG = nullptr,
                  bool force = false);

75/// This represents a list of ValueType's that has been intern'd by
76/// a SelectionDAG.  Instances of this simple value class are returned by
77/// SelectionDAG::getVTList(...).
78///
79struct SDVTList {
const EVT *VTs;
unsigned int NumVTs;
82};

84namespace ISD {

/// Node predicates

88/// If N is a BUILD_VECTOR or SPLAT_VECTOR node whose elements are all the
89/// same constant or undefined, return true and return the constant value in
90/// \p SplatValue.
91bool isConstantSplatVector(const SDNode *N, APInt &SplatValue);

93/// Return true if the specified node is a BUILD_VECTOR or SPLAT_VECTOR where
94/// all of the elements are ~0 or undef. If \p BuildVectorOnly is set to
95/// true, it only checks BUILD_VECTOR.
96bool isConstantSplatVectorAllOnes(const SDNode *N,
                                bool BuildVectorOnly = false);

99/// Return true if the specified node is a BUILD_VECTOR or SPLAT_VECTOR where
100/// all of the elements are 0 or undef. If \p BuildVectorOnly is set to true, it
101/// only checks BUILD_VECTOR.
102bool isConstantSplatVectorAllZeros(const SDNode *N,
                                 bool BuildVectorOnly = false);

105/// Return true if the specified node is a BUILD_VECTOR where all of the
106/// elements are ~0 or undef.
107bool isBuildVectorAllOnes(const SDNode *N);

109/// Return true if the specified node is a BUILD_VECTOR where all of the
110/// elements are 0 or undef.
111bool isBuildVectorAllZeros(const SDNode *N);

113/// Return true if the specified node is a BUILD_VECTOR node of all
114/// ConstantSDNode or undef.
115bool isBuildVectorOfConstantSDNodes(const SDNode *N);

117/// Return true if the specified node is a BUILD_VECTOR node of all
118/// ConstantFPSDNode or undef.
119bool isBuildVectorOfConstantFPSDNodes(const SDNode *N);

121/// Return true if the node has at least one operand and all operands of the
122/// specified node are ISD::UNDEF.
123bool allOperandsUndef(const SDNode *N);

125} // end namespace ISD

127//===----------------------------------------------------------------------===//
128/// Unlike LLVM values, Selection DAG nodes may return multiple
129/// values as the result of a computation.  Many nodes return multiple values,
130/// from loads (which define a token and a return value) to ADDC (which returns
131/// a result and a carry value), to calls (which may return an arbitrary number
132/// of values).
133///
134/// As such, each use of a SelectionDAG computation must indicate the node that
135/// computes it as well as which return value to use from that node.  This pair
136/// of information is represented with the SDValue value type.
137///
138class SDValue {
friend struct DenseMapInfo<SDValue>;

SDNode *Node = nullptr; // The node defining the value we are using.
unsigned ResNo = 0;     // Which return value of the node we are using.

144public:
SDValue() = default;
SDValue(SDNode *node, unsigned resno);

/// get the index which selects a specific result in the SDNode
unsigned getResNo() const { return ResNo; }

/// get the SDNode which holds the desired result
SDNode *getNode() const { return Node; }

/// set the SDNode
void setNode(SDNode *N) { Node = N; }

inline SDNode *operator->() const { return Node; }

bool operator==(const SDValue &O) const {
  return Node == O.Node && ResNo == O.ResNo;
}
bool operator!=(const SDValue &O) const {
  return !operator==(O);
}
bool operator<(const SDValue &O) const {
  return std::tie(Node, ResNo) < std::tie(O.Node, O.ResNo);
}
explicit operator bool() const {
  return Node != nullptr;
}

SDValue getValue(unsigned R) const {
  return SDValue(Node, R);
}

/// Return true if this node is an operand of N.
bool isOperandOf(const SDNode *N) const;

/// Return the ValueType of the referenced return value.
inline EVT getValueType() const;

/// Return the simple ValueType of the referenced return value.
MVT getSimpleValueType() const {
  return getValueType().getSimpleVT();
}

/// Returns the size of the value in bits.
///
/// If the value type is a scalable vector type, the scalable property will
/// be set and the runtime size will be a positive integer multiple of the
/// base size.
TypeSize getValueSizeInBits() const {
  return getValueType().getSizeInBits();
}

uint64_t getScalarValueSizeInBits() const {
  return getValueType().getScalarType().getFixedSizeInBits();
}

// Forwarding methods - These forward to the corresponding methods in SDNode.
inline unsigned getOpcode() const;
inline unsigned getNumOperands() const;
inline const SDValue &getOperand(unsigned i) const;
inline uint64_t getConstantOperandVal(unsigned i) const;
inline const APInt &getConstantOperandAPInt(unsigned i) const;
inline bool isTargetMemoryOpcode() const;
inline bool isTargetOpcode() const;
inline bool isMachineOpcode() const;
inline bool isUndef() const;
inline unsigned getMachineOpcode() const;
inline const DebugLoc &getDebugLoc() const;
inline void dump() const;
inline void dump(const SelectionDAG *G) const;
inline void dumpr() const;
inline void dumpr(const SelectionDAG *G) const;

/// Return true if this operand (which must be a chain) reaches the
/// specified operand without crossing any side-effecting instructions.
/// In practice, this looks through token factors and non-volatile loads.
/// In order to remain efficient, this only
/// looks a couple of nodes in, it does not do an exhaustive search.
bool reachesChainWithoutSideEffects(SDValue Dest,
                                    unsigned Depth = 2) const;

/// Return true if there are no nodes using value ResNo of Node.
inline bool use_empty() const;

/// Return true if there is exactly one node using value ResNo of Node.
inline bool hasOneUse() const;
230};

232template<> struct DenseMapInfo<SDValue> {
static inline SDValue getEmptyKey() {
  SDValue V;
  V.ResNo = -1U;
  return V;
}

static inline SDValue getTombstoneKey() {
  SDValue V;
  V.ResNo = -2U;
  return V;
}

static unsigned getHashValue(const SDValue &Val) {
  return ((unsigned)((uintptr_t)Val.getNode() >> 4) ^
          (unsigned)((uintptr_t)Val.getNode() >> 9)) + Val.getResNo();
}

static bool isEqual(const SDValue &LHS, const SDValue &RHS) {
  return LHS == RHS;
}
253};

255/// Allow casting operators to work directly on
256/// SDValues as if they were SDNode*'s.
257template<> struct simplify_type<SDValue> {
using SimpleType = SDNode *;

static SimpleType getSimplifiedValue(SDValue &Val) {
  return Val.getNode();
13
←
Returning without writing to 'Val.Node'→
}
263};
264template<> struct simplify_type<const SDValue> {
using SimpleType = /*const*/ SDNode *;

static SimpleType getSimplifiedValue(const SDValue &Val) {
  return Val.getNode();
}
270};

272/// Represents a use of a SDNode. This class holds an SDValue,
273/// which records the SDNode being used and the result number, a
274/// pointer to the SDNode using the value, and Next and Prev pointers,
275/// which link together all the uses of an SDNode.
276///
277class SDUse {
/// Val - The value being used.
SDValue Val;
/// User - The user of this value.
SDNode *User = nullptr;
/// Prev, Next - Pointers to the uses list of the SDNode referred by
/// this operand.
SDUse **Prev = nullptr;
SDUse *Next = nullptr;

287public:
SDUse() = default;
SDUse(const SDUse &U) = delete;
SDUse &operator=(const SDUse &) = delete;

/// Normally SDUse will just implicitly convert to an SDValue that it holds.
operator const SDValue&() const { return Val; }

/// If implicit conversion to SDValue doesn't work, the get() method returns
/// the SDValue.
const SDValue &get() const { return Val; }

/// This returns the SDNode that contains this Use.
SDNode *getUser() { return User; }

/// Get the next SDUse in the use list.
SDUse *getNext() const { return Next; }

/// Convenience function for get().getNode().
SDNode *getNode() const { return Val.getNode(); }
/// Convenience function for get().getResNo().
unsigned getResNo() const { return Val.getResNo(); }
/// Convenience function for get().getValueType().
EVT getValueType() const { return Val.getValueType(); }

/// Convenience function for get().operator==
bool operator==(const SDValue &V) const {
  return Val == V;
}

/// Convenience function for get().operator!=
bool operator!=(const SDValue &V) const {
  return Val != V;
}

/// Convenience function for get().operator<
bool operator<(const SDValue &V) const {
  return Val < V;
}

327private:
friend class SelectionDAG;
friend class SDNode;
// TODO: unfriend HandleSDNode once we fix its operand handling.
friend class HandleSDNode;

void setUser(SDNode *p) { User = p; }

/// Remove this use from its existing use list, assign it the
/// given value, and add it to the new value's node's use list.
inline void set(const SDValue &V);
/// Like set, but only supports initializing a newly-allocated
/// SDUse with a non-null value.
inline void setInitial(const SDValue &V);
/// Like set, but only sets the Node portion of the value,
/// leaving the ResNo portion unmodified.
inline void setNode(SDNode *N);

void addToList(SDUse **List) {
  Next = *List;
  if (Next) Next->Prev = &Next;
  Prev = List;
  *List = this;
}

void removeFromList() {
  *Prev = Next;
  if (Next) Next->Prev = Prev;
}
356};

358/// simplify_type specializations - Allow casting operators to work directly on
359/// SDValues as if they were SDNode*'s.
360template<> struct simplify_type<SDUse> {
using SimpleType = SDNode *;

static SimpleType getSimplifiedValue(SDUse &Val) {
  return Val.getNode();
}
366};

368/// These are IR-level optimization flags that may be propagated to SDNodes.
369/// TODO: This data structure should be shared by the IR optimizer and the
370/// the backend.
371struct SDNodeFlags {
372private:
bool NoUnsignedWrap : 1;
bool NoSignedWrap : 1;
bool Exact : 1;
bool NoNaNs : 1;
bool NoInfs : 1;
bool NoSignedZeros : 1;
bool AllowReciprocal : 1;
bool AllowContract : 1;
bool ApproximateFuncs : 1;
bool AllowReassociation : 1;

// We assume instructions do not raise floating-point exceptions by default,
// and only those marked explicitly may do so.  We could choose to represent
// this via a positive "FPExcept" flags like on the MI level, but having a
// negative "NoFPExcept" flag here (that defaults to true) makes the flag
// intersection logic more straightforward.
bool NoFPExcept : 1;

391public:
/// Default constructor turns off all optimization flags.
SDNodeFlags()
    : NoUnsignedWrap(false), NoSignedWrap(false), Exact(false), NoNaNs(false),
      NoInfs(false), NoSignedZeros(false), AllowReciprocal(false),
      AllowContract(false), ApproximateFuncs(false),
      AllowReassociation(false), NoFPExcept(false) {}

/// Propagate the fast-math-flags from an IR FPMathOperator.
void copyFMF(const FPMathOperator &FPMO) {
  setNoNaNs(FPMO.hasNoNaNs());
  setNoInfs(FPMO.hasNoInfs());
  setNoSignedZeros(FPMO.hasNoSignedZeros());
  setAllowReciprocal(FPMO.hasAllowReciprocal());
  setAllowContract(FPMO.hasAllowContract());
  setApproximateFuncs(FPMO.hasApproxFunc());
  setAllowReassociation(FPMO.hasAllowReassoc());
}

// These are mutators for each flag.
void setNoUnsignedWrap(bool b) { NoUnsignedWrap = b; }
void setNoSignedWrap(bool b) { NoSignedWrap = b; }
void setExact(bool b) { Exact = b; }
void setNoNaNs(bool b) { NoNaNs = b; }
void setNoInfs(bool b) { NoInfs = b; }
void setNoSignedZeros(bool b) { NoSignedZeros = b; }
void setAllowReciprocal(bool b) { AllowReciprocal = b; }
void setAllowContract(bool b) { AllowContract = b; }
void setApproximateFuncs(bool b) { ApproximateFuncs = b; }
void setAllowReassociation(bool b) { AllowReassociation = b; }
void setNoFPExcept(bool b) { NoFPExcept = b; }

// These are accessors for each flag.
bool hasNoUnsignedWrap() const { return NoUnsignedWrap; }
bool hasNoSignedWrap() const { return NoSignedWrap; }
bool hasExact() const { return Exact; }
bool hasNoNaNs() const { return NoNaNs; }
bool hasNoInfs() const { return NoInfs; }
bool hasNoSignedZeros() const { return NoSignedZeros; }
bool hasAllowReciprocal() const { return AllowReciprocal; }
bool hasAllowContract() const { return AllowContract; }
bool hasApproximateFuncs() const { return ApproximateFuncs; }
bool hasAllowReassociation() const { return AllowReassociation; }
bool hasNoFPExcept() const { return NoFPExcept; }

/// Clear any flags in this flag set that aren't also set in Flags. All
/// flags will be cleared if Flags are undefined.
void intersectWith(const SDNodeFlags Flags) {
  NoUnsignedWrap &= Flags.NoUnsignedWrap;
  NoSignedWrap &= Flags.NoSignedWrap;
  Exact &= Flags.Exact;
  NoNaNs &= Flags.NoNaNs;
  NoInfs &= Flags.NoInfs;
  NoSignedZeros &= Flags.NoSignedZeros;
  AllowReciprocal &= Flags.AllowReciprocal;
  AllowContract &= Flags.AllowContract;
  ApproximateFuncs &= Flags.ApproximateFuncs;
  AllowReassociation &= Flags.AllowReassociation;
  NoFPExcept &= Flags.NoFPExcept;
}
451};

453/// Represents one node in the SelectionDAG.
454///
455class SDNode : public FoldingSetNode, public ilist_node<SDNode> {
456private:
/// The operation that this node performs.
int16_t NodeType;

460protected:
// We define a set of mini-helper classes to help us interpret the bits in our
// SubclassData.  These are designed to fit within a uint16_t so they pack
// with NodeType.

465#if defined(_AIX) && (!defined(__GNUC__4) || defined(__clang__1))
466// Except for GCC; by default, AIX compilers store bit-fields in 4-byte words
467// and give the `pack` pragma push semantics.
468#define BEGIN_TWO_BYTE_PACK() _Pragma("pack(2)")pack(2)
469#define END_TWO_BYTE_PACK() _Pragma("pack(pop)")pack(pop)
470#else
471#define BEGIN_TWO_BYTE_PACK()
472#define END_TWO_BYTE_PACK()
473#endif

475BEGIN_TWO_BYTE_PACK()
class SDNodeBitfields {
  friend class SDNode;
  friend class MemIntrinsicSDNode;
  friend class MemSDNode;
  friend class SelectionDAG;

  uint16_t HasDebugValue : 1;
  uint16_t IsMemIntrinsic : 1;
  uint16_t IsDivergent : 1;
};
enum { NumSDNodeBits = 3 };

class ConstantSDNodeBitfields {
  friend class ConstantSDNode;

  uint16_t : NumSDNodeBits;

  uint16_t IsOpaque : 1;
};

class MemSDNodeBitfields {
  friend class MemSDNode;
  friend class MemIntrinsicSDNode;
  friend class AtomicSDNode;

  uint16_t : NumSDNodeBits;

  uint16_t IsVolatile : 1;
  uint16_t IsNonTemporal : 1;
  uint16_t IsDereferenceable : 1;
  uint16_t IsInvariant : 1;
};
enum { NumMemSDNodeBits = NumSDNodeBits + 4 };

class LSBaseSDNodeBitfields {
  friend class LSBaseSDNode;
  friend class MaskedLoadStoreSDNode;
  friend class MaskedGatherScatterSDNode;

  uint16_t : NumMemSDNodeBits;

  // This storage is shared between disparate class hierarchies to hold an
  // enumeration specific to the class hierarchy in use.
  //   LSBaseSDNode => enum ISD::MemIndexedMode
  //   MaskedLoadStoreBaseSDNode => enum ISD::MemIndexedMode
  //   MaskedGatherScatterSDNode => enum ISD::MemIndexType
  uint16_t AddressingMode : 3;
};
enum { NumLSBaseSDNodeBits = NumMemSDNodeBits + 3 };

class LoadSDNodeBitfields {
  friend class LoadSDNode;
  friend class MaskedLoadSDNode;
  friend class MaskedGatherSDNode;

  uint16_t : NumLSBaseSDNodeBits;

  uint16_t ExtTy : 2; // enum ISD::LoadExtType
  uint16_t IsExpanding : 1;
};

class StoreSDNodeBitfields {
  friend class StoreSDNode;
  friend class MaskedStoreSDNode;
  friend class MaskedScatterSDNode;

  uint16_t : NumLSBaseSDNodeBits;

  uint16_t IsTruncating : 1;
  uint16_t IsCompressing : 1;
};

union {
  char RawSDNodeBits[sizeof(uint16_t)];
  SDNodeBitfields SDNodeBits;
  ConstantSDNodeBitfields ConstantSDNodeBits;
  MemSDNodeBitfields MemSDNodeBits;
  LSBaseSDNodeBitfields LSBaseSDNodeBits;
  LoadSDNodeBitfields LoadSDNodeBits;
  StoreSDNodeBitfields StoreSDNodeBits;
};
557END_TWO_BYTE_PACK()
558#undef BEGIN_TWO_BYTE_PACK
559#undef END_TWO_BYTE_PACK

// RawSDNodeBits must cover the entirety of the union.  This means that all of
// the union's members must have size <= RawSDNodeBits.  We write the RHS as
// "2" instead of sizeof(RawSDNodeBits) because MSVC can't handle the latter.
static_assert(sizeof(SDNodeBitfields) <= 2, "field too wide");
static_assert(sizeof(ConstantSDNodeBitfields) <= 2, "field too wide");
static_assert(sizeof(MemSDNodeBitfields) <= 2, "field too wide");
static_assert(sizeof(LSBaseSDNodeBitfields) <= 2, "field too wide");
static_assert(sizeof(LoadSDNodeBitfields) <= 2, "field too wide");
static_assert(sizeof(StoreSDNodeBitfields) <= 2, "field too wide");

571private:
friend class SelectionDAG;
// TODO: unfriend HandleSDNode once we fix its operand handling.
friend class HandleSDNode;

/// Unique id per SDNode in the DAG.
int NodeId = -1;

/// The values that are used by this operation.
SDUse *OperandList = nullptr;

/// The types of the values this node defines.  SDNode's may
/// define multiple values simultaneously.
const EVT *ValueList;

/// List of uses for this SDNode.
SDUse *UseList = nullptr;

/// The number of entries in the Operand/Value list.
unsigned short NumOperands = 0;
unsigned short NumValues;

// The ordering of the SDNodes. It roughly corresponds to the ordering of the
// original LLVM instructions.
// This is used for turning off scheduling, because we'll forgo
// the normal scheduling algorithms and output the instructions according to
// this ordering.
unsigned IROrder;

/// Source line information.
DebugLoc debugLoc;

/// Return a pointer to the specified value type.
static const EVT *getValueTypeList(EVT VT);

SDNodeFlags Flags;

608public:
/// Unique and persistent id per SDNode in the DAG.
/// Used for debug printing.
uint16_t PersistentId;

//===--------------------------------------------------------------------===//
//  Accessors
//

/// Return the SelectionDAG opcode value for this node. For
/// pre-isel nodes (those for which isMachineOpcode returns false), these
/// are the opcode values in the ISD and <target>ISD namespaces. For
/// post-isel opcodes, see getMachineOpcode.
unsigned getOpcode()  const { return (unsigned short)NodeType; }

/// Test if this node has a target-specific opcode (in the
/// \<target\>ISD namespace).
bool isTargetOpcode() const { return NodeType >= ISD::BUILTIN_OP_END; }

/// Test if this node has a target-specific opcode that may raise
/// FP exceptions (in the \<target\>ISD namespace and greater than
/// FIRST_TARGET_STRICTFP_OPCODE).  Note that all target memory
/// opcode are currently automatically considered to possibly raise
/// FP exceptions as well.
bool isTargetStrictFPOpcode() const {
  return NodeType >= ISD::FIRST_TARGET_STRICTFP_OPCODE;
}

/// Test if this node has a target-specific
/// memory-referencing opcode (in the \<target\>ISD namespace and
/// greater than FIRST_TARGET_MEMORY_OPCODE).
bool isTargetMemoryOpcode() const {
  return NodeType >= ISD::FIRST_TARGET_MEMORY_OPCODE;
}

/// Return true if the type of the node type undefined.
bool isUndef() const { return NodeType == ISD::UNDEF; }

/// Test if this node is a memory intrinsic (with valid pointer information).
/// INTRINSIC_W_CHAIN and INTRINSIC_VOID nodes are sometimes created for
/// non-memory intrinsics (with chains) that are not really instances of
/// MemSDNode. For such nodes, we need some extra state to determine the
/// proper classof relationship.
bool isMemIntrinsic() const {
  return (NodeType == ISD::INTRINSIC_W_CHAIN ||
          NodeType == ISD::INTRINSIC_VOID) &&
         SDNodeBits.IsMemIntrinsic;
}

/// Test if this node is a strict floating point pseudo-op.
bool isStrictFPOpcode() {
  switch (NodeType) {
    default:
      return false;
    case ISD::STRICT_FP16_TO_FP:
    case ISD::STRICT_FP_TO_FP16:
664#define DAG_INSTRUCTION(NAME, NARG, ROUND_MODE, INTRINSIC, DAGN)               \
    case ISD::STRICT_##DAGN:
666#include "llvm/IR/ConstrainedOps.def"
      return true;
  }
}

/// Test if this node has a post-isel opcode, directly
/// corresponding to a MachineInstr opcode.
bool isMachineOpcode() const { return NodeType < 0; }

/// This may only be called if isMachineOpcode returns
/// true. It returns the MachineInstr opcode value that the node's opcode
/// corresponds to.
unsigned getMachineOpcode() const {
  assert(isMachineOpcode() && "Not a MachineInstr opcode!")((void)0);
  return ~NodeType;
}

bool getHasDebugValue() const { return SDNodeBits.HasDebugValue; }
void setHasDebugValue(bool b) { SDNodeBits.HasDebugValue = b; }

bool isDivergent() const { return SDNodeBits.IsDivergent; }

/// Return true if there are no uses of this node.
bool use_empty() const { return UseList == nullptr; }

/// Return true if there is exactly one use of this node.
bool hasOneUse() const { return hasSingleElement(uses()); }

/// Return the number of uses of this node. This method takes
/// time proportional to the number of uses.
size_t use_size() const { return std::distance(use_begin(), use_end()); }

/// Return the unique node id.
int getNodeId() const { return NodeId; }

/// Set unique node id.
void setNodeId(int Id) { NodeId = Id; }

/// Return the node ordering.
unsigned getIROrder() const { return IROrder; }

/// Set the node ordering.
void setIROrder(unsigned Order) { IROrder = Order; }

/// Return the source location info.
const DebugLoc &getDebugLoc() const { return debugLoc; }

/// Set source location info.  Try to avoid this, putting
/// it in the constructor is preferable.
void setDebugLoc(DebugLoc dl) { debugLoc = std::move(dl); }

/// This class provides iterator support for SDUse
/// operands that use a specific SDNode.
class use_iterator {
  friend class SDNode;

  SDUse *Op = nullptr;

  explicit use_iterator(SDUse *op) : Op(op) {}

public:
  using iterator_category = std::forward_iterator_tag;
  using value_type = SDUse;
  using difference_type = std::ptrdiff_t;
  using pointer = value_type *;
  using reference = value_type &;

  use_iterator() = default;
  use_iterator(const use_iterator &I) : Op(I.Op) {}

  bool operator==(const use_iterator &x) const {
    return Op == x.Op;
  }
  bool operator!=(const use_iterator &x) const {
    return !operator==(x);
  }

  /// Return true if this iterator is at the end of uses list.
  bool atEnd() const { return Op == nullptr; }

  // Iterator traversal: forward iteration only.
  use_iterator &operator++() {          // Preincrement
    assert(Op && "Cannot increment end iterator!")((void)0);
    Op = Op->getNext();
    return *this;
  }

  use_iterator operator++(int) {        // Postincrement
    use_iterator tmp = *this; ++*this; return tmp;
  }

  /// Retrieve a pointer to the current user node.
  SDNode *operator*() const {
    assert(Op && "Cannot dereference end iterator!")((void)0);
    return Op->getUser();
  }

  SDNode *operator->() const { return operator*(); }

  SDUse &getUse() const { return *Op; }

  /// Retrieve the operand # of this use in its user.
  unsigned getOperandNo() const {
    assert(Op && "Cannot dereference end iterator!")((void)0);
    return (unsigned)(Op - Op->getUser()->OperandList);
  }
};

/// Provide iteration support to walk over all uses of an SDNode.
use_iterator use_begin() const {
  return use_iterator(UseList);
}

static use_iterator use_end() { return use_iterator(nullptr); }

inline iterator_range<use_iterator> uses() {
  return make_range(use_begin(), use_end());
}
inline iterator_range<use_iterator> uses() const {
  return make_range(use_begin(), use_end());
}

/// Return true if there are exactly NUSES uses of the indicated value.
/// This method ignores uses of other values defined by this operation.
bool hasNUsesOfValue(unsigned NUses, unsigned Value) const;

/// Return true if there are any use of the indicated value.
/// This method ignores uses of other values defined by this operation.
bool hasAnyUseOfValue(unsigned Value) const;

/// Return true if this node is the only use of N.
bool isOnlyUserOf(const SDNode *N) const;

/// Return true if this node is an operand of N.
bool isOperandOf(const SDNode *N) const;

/// Return true if this node is a predecessor of N.
/// NOTE: Implemented on top of hasPredecessor and every bit as
/// expensive. Use carefully.
bool isPredecessorOf(const SDNode *N) const {
  return N->hasPredecessor(this);
}

/// Return true if N is a predecessor of this node.
/// N is either an operand of this node, or can be reached by recursively
/// traversing up the operands.
/// NOTE: This is an expensive method. Use it carefully.
bool hasPredecessor(const SDNode *N) const;

/// Returns true if N is a predecessor of any node in Worklist. This
/// helper keeps Visited and Worklist sets externally to allow unions
/// searches to be performed in parallel, caching of results across
/// queries and incremental addition to Worklist. Stops early if N is
/// found but will resume. Remember to clear Visited and Worklists
/// if DAG changes. MaxSteps gives a maximum number of nodes to visit before
/// giving up. The TopologicalPrune flag signals that positive NodeIds are
/// topologically ordered (Operands have strictly smaller node id) and search
/// can be pruned leveraging this.
static bool hasPredecessorHelper(const SDNode *N,
                                 SmallPtrSetImpl<const SDNode *> &Visited,
                                 SmallVectorImpl<const SDNode *> &Worklist,
                                 unsigned int MaxSteps = 0,
                                 bool TopologicalPrune = false) {
  SmallVector<const SDNode *, 8> DeferredNodes;
  if (Visited.count(N))
    return true;

  // Node Id's are assigned in three places: As a topological
  // ordering (> 0), during legalization (results in values set to
  // 0), new nodes (set to -1). If N has a topolgical id then we
  // know that all nodes with ids smaller than it cannot be
  // successors and we need not check them. Filter out all node
  // that can't be matches. We add them to the worklist before exit
  // in case of multiple calls. Note that during selection the topological id
  // may be violated if a node's predecessor is selected before it. We mark
  // this at selection negating the id of unselected successors and
  // restricting topological pruning to positive ids.

  int NId = N->getNodeId();
  // If we Invalidated the Id, reconstruct original NId.
  if (NId < -1)
    NId = -(NId + 1);

  bool Found = false;
  while (!Worklist.empty()) {
    const SDNode *M = Worklist.pop_back_val();
    int MId = M->getNodeId();
    if (TopologicalPrune && M->getOpcode() != ISD::TokenFactor && (NId > 0) &&
        (MId > 0) && (MId < NId)) {
      DeferredNodes.push_back(M);
      continue;
    }
    for (const SDValue &OpV : M->op_values()) {
      SDNode *Op = OpV.getNode();
      if (Visited.insert(Op).second)
        Worklist.push_back(Op);
      if (Op == N)
        Found = true;
    }
    if (Found)
      break;
    if (MaxSteps != 0 && Visited.size() >= MaxSteps)
      break;
  }
  // Push deferred nodes back on worklist.
  Worklist.append(DeferredNodes.begin(), DeferredNodes.end());
  // If we bailed early, conservatively return found.
  if (MaxSteps != 0 && Visited.size() >= MaxSteps)
    return true;
  return Found;
}

/// Return true if all the users of N are contained in Nodes.
/// NOTE: Requires at least one match, but doesn't require them all.
static bool areOnlyUsersOf(ArrayRef<const SDNode *> Nodes, const SDNode *N);

/// Return the number of values used by this operation.
unsigned getNumOperands() const { return NumOperands; }

/// Return the maximum number of operands that a SDNode can hold.
static constexpr size_t getMaxNumOperands() {
  return std::numeric_limits<decltype(SDNode::NumOperands)>::max();
}

/// Helper method returns the integer value of a ConstantSDNode operand.
inline uint64_t getConstantOperandVal(unsigned Num) const;

/// Helper method returns the APInt of a ConstantSDNode operand.
inline const APInt &getConstantOperandAPInt(unsigned Num) const;

const SDValue &getOperand(unsigned Num) const {
  assert(Num < NumOperands && "Invalid child # of SDNode!")((void)0);
  return OperandList[Num];
}

using op_iterator = SDUse *;

op_iterator op_begin() const { return OperandList; }
op_iterator op_end() const { return OperandList+NumOperands; }
ArrayRef<SDUse> ops() const { return makeArrayRef(op_begin(), op_end()); }

/// Iterator for directly iterating over the operand SDValue's.
struct value_op_iterator
    : iterator_adaptor_base<value_op_iterator, op_iterator,
                            std::random_access_iterator_tag, SDValue,
                            ptrdiff_t, value_op_iterator *,
                            value_op_iterator *> {
  explicit value_op_iterator(SDUse *U = nullptr)
    : iterator_adaptor_base(U) {}

  const SDValue &operator*() const { return I->get(); }
};

iterator_range<value_op_iterator> op_values() const {
  return make_range(value_op_iterator(op_begin()),
                    value_op_iterator(op_end()));
}

SDVTList getVTList() const {
  SDVTList X = { ValueList, NumValues };
  return X;
}

/// If this node has a glue operand, return the node
/// to which the glue operand points. Otherwise return NULL.
SDNode *getGluedNode() const {
  if (getNumOperands() != 0 &&
      getOperand(getNumOperands()-1).getValueType() == MVT::Glue)
    return getOperand(getNumOperands()-1).getNode();
  return nullptr;
}

/// If this node has a glue value with a user, return
/// the user (there is at most one). Otherwise return NULL.
SDNode *getGluedUser() const {
  for (use_iterator UI = use_begin(), UE = use_end(); UI != UE; ++UI)
    if (UI.getUse().get().getValueType() == MVT::Glue)
      return *UI;
  return nullptr;
}

SDNodeFlags getFlags() const { return Flags; }
void setFlags(SDNodeFlags NewFlags) { Flags = NewFlags; }

/// Clear any flags in this node that aren't also set in Flags.
/// If Flags is not in a defined state then this has no effect.
void intersectFlagsWith(const SDNodeFlags Flags);

/// Return the number of values defined/returned by this operator.
unsigned getNumValues() const { return NumValues; }

/// Return the type of a specified result.
EVT getValueType(unsigned ResNo) const {
  assert(ResNo < NumValues && "Illegal result number!")((void)0);
  return ValueList[ResNo];
}

/// Return the type of a specified result as a simple type.
MVT getSimpleValueType(unsigned ResNo) const {
  return getValueType(ResNo).getSimpleVT();
}

/// Returns MVT::getSizeInBits(getValueType(ResNo)).
///
/// If the value type is a scalable vector type, the scalable property will
/// be set and the runtime size will be a positive integer multiple of the
/// base size.
TypeSize getValueSizeInBits(unsigned ResNo) const {
  return getValueType(ResNo).getSizeInBits();
}

using value_iterator = const EVT *;

value_iterator value_begin() const { return ValueList; }
value_iterator value_end() const { return ValueList+NumValues; }
iterator_range<value_iterator> values() const {
  return llvm::make_range(value_begin(), value_end());
}

/// Return the opcode of this operation for printing.
std::string getOperationName(const SelectionDAG *G = nullptr) const;
static const char* getIndexedModeName(ISD::MemIndexedMode AM);
void print_types(raw_ostream &OS, const SelectionDAG *G) const;
void print_details(raw_ostream &OS, const SelectionDAG *G) const;
void print(raw_ostream &OS, const SelectionDAG *G = nullptr) const;
void printr(raw_ostream &OS, const SelectionDAG *G = nullptr) const;

/// Print a SelectionDAG node and all children down to
/// the leaves.  The given SelectionDAG allows target-specific nodes
/// to be printed in human-readable form.  Unlike printr, this will
/// print the whole DAG, including children that appear multiple
/// times.
///
void printrFull(raw_ostream &O, const SelectionDAG *G = nullptr) const;

/// Print a SelectionDAG node and children up to
/// depth "depth."  The given SelectionDAG allows target-specific
/// nodes to be printed in human-readable form.  Unlike printr, this
/// will print children that appear multiple times wherever they are
/// used.
///
void printrWithDepth(raw_ostream &O, const SelectionDAG *G = nullptr,
                     unsigned depth = 100) const;

/// Dump this node, for debugging.
void dump() const;

/// Dump (recursively) this node and its use-def subgraph.
void dumpr() const;

/// Dump this node, for debugging.
/// The given SelectionDAG allows target-specific nodes to be printed
/// in human-readable form.
void dump(const SelectionDAG *G) const;

/// Dump (recursively) this node and its use-def subgraph.
/// The given SelectionDAG allows target-specific nodes to be printed
/// in human-readable form.
void dumpr(const SelectionDAG *G) const;

/// printrFull to dbgs().  The given SelectionDAG allows
/// target-specific nodes to be printed in human-readable form.
/// Unlike dumpr, this will print the whole DAG, including children
/// that appear multiple times.
void dumprFull(const SelectionDAG *G = nullptr) const;

/// printrWithDepth to dbgs().  The given
/// SelectionDAG allows target-specific nodes to be printed in
/// human-readable form.  Unlike dumpr, this will print children
/// that appear multiple times wherever they are used.
///
void dumprWithDepth(const SelectionDAG *G = nullptr,
                    unsigned depth = 100) const;

/// Gather unique data for the node.
void Profile(FoldingSetNodeID &ID) const;

/// This method should only be used by the SDUse class.
void addUse(SDUse &U) { U.addToList(&UseList); }

1046protected:
static SDVTList getSDVTList(EVT VT) {
  SDVTList Ret = { getValueTypeList(VT), 1 };
  return Ret;
}

/// Create an SDNode.
///
/// SDNodes are created without any operands, and never own the operand
/// storage. To add operands, see SelectionDAG::createOperands.
SDNode(unsigned Opc, unsigned Order, DebugLoc dl, SDVTList VTs)
    : NodeType(Opc), ValueList(VTs.VTs), NumValues(VTs.NumVTs),
      IROrder(Order), debugLoc(std::move(dl)) {
  memset(&RawSDNodeBits, 0, sizeof(RawSDNodeBits));
  assert(debugLoc.hasTrivialDestructor() && "Expected trivial destructor")((void)0);
  assert(NumValues == VTs.NumVTs &&((void)0)
         "NumValues wasn't wide enough for its operands!")((void)0);
}

/// Release the operands and set this node to have zero operands.
void DropOperands();
1067};

1069/// Wrapper class for IR location info (IR ordering and DebugLoc) to be passed
1070/// into SDNode creation functions.
1071/// When an SDNode is created from the DAGBuilder, the DebugLoc is extracted
1072/// from the original Instruction, and IROrder is the ordinal position of
1073/// the instruction.
1074/// When an SDNode is created after the DAG is being built, both DebugLoc and
1075/// the IROrder are propagated from the original SDNode.
1076/// So SDLoc class provides two constructors besides the default one, one to
1077/// be used by the DAGBuilder, the other to be used by others.
1078class SDLoc {
1079private:
DebugLoc DL;
int IROrder = 0;

1083public:
SDLoc() = default;
SDLoc(const SDNode *N) : DL(N->getDebugLoc()), IROrder(N->getIROrder()) {}
SDLoc(const SDValue V) : SDLoc(V.getNode()) {}
SDLoc(const Instruction *I, int Order) : IROrder(Order) {
  assert(Order >= 0 && "bad IROrder")((void)0);
  if (I)
    DL = I->getDebugLoc();
}

unsigned getIROrder() const { return IROrder; }
const DebugLoc &getDebugLoc() const { return DL; }
1095};

1097// Define inline functions from the SDValue class.

1099inline SDValue::SDValue(SDNode *node, unsigned resno)
  : Node(node), ResNo(resno) {
// Explicitly check for !ResNo to avoid use-after-free, because there are
// callers that use SDValue(N, 0) with a deleted N to indicate successful
// combines.
assert((!Node || !ResNo || ResNo < Node->getNumValues()) &&((void)0)
       "Invalid result number for the given node!")((void)0);
assert(ResNo < -2U && "Cannot use result numbers reserved for DenseMaps.")((void)0);
1107}

1109inline unsigned SDValue::getOpcode() const {
return Node->getOpcode();
26
←
Called C++ object pointer is null
1111}

1113inline EVT SDValue::getValueType() const {
return Node->getValueType(ResNo);
1115}

1117inline unsigned SDValue::getNumOperands() const {
return Node->getNumOperands();
1119}

1121inline const SDValue &SDValue::getOperand(unsigned i) const {
return Node->getOperand(i);
1123}

1125inline uint64_t SDValue::getConstantOperandVal(unsigned i) const {
return Node->getConstantOperandVal(i);
1127}

1129inline const APInt &SDValue::getConstantOperandAPInt(unsigned i) const {
return Node->getConstantOperandAPInt(i);
1131}

1133inline bool SDValue::isTargetOpcode() const {
return Node->isTargetOpcode();
1135}

1137inline bool SDValue::isTargetMemoryOpcode() const {
return Node->isTargetMemoryOpcode();
1139}

1141inline bool SDValue::isMachineOpcode() const {
return Node->isMachineOpcode();
1143}

1145inline unsigned SDValue::getMachineOpcode() const {
return Node->getMachineOpcode();
1147}

1149inline bool SDValue::isUndef() const {
return Node->isUndef();
1151}

1153inline bool SDValue::use_empty() const {
return !Node->hasAnyUseOfValue(ResNo);
1155}

1157inline bool SDValue::hasOneUse() const {
return Node->hasNUsesOfValue(1, ResNo);
1159}

1161inline const DebugLoc &SDValue::getDebugLoc() const {
return Node->getDebugLoc();
1163}

1165inline void SDValue::dump() const {
return Node->dump();
1167}

1169inline void SDValue::dump(const SelectionDAG *G) const {
return Node->dump(G);
1171}

1173inline void SDValue::dumpr() const {
return Node->dumpr();
1175}

1177inline void SDValue::dumpr(const SelectionDAG *G) const {
return Node->dumpr(G);
1179}

1181// Define inline functions from the SDUse class.

1183inline void SDUse::set(const SDValue &V) {
if (Val.getNode()) removeFromList();
Val = V;
if (V.getNode()) V.getNode()->addUse(*this);
1187}

1189inline void SDUse::setInitial(const SDValue &V) {
Val = V;
V.getNode()->addUse(*this);
1192}

1194inline void SDUse::setNode(SDNode *N) {
if (Val.getNode()) removeFromList();
Val.setNode(N);
if (N) N->addUse(*this);
1198}

1200/// This class is used to form a handle around another node that
1201/// is persistent and is updated across invocations of replaceAllUsesWith on its
1202/// operand.  This node should be directly created by end-users and not added to
1203/// the AllNodes list.
1204class HandleSDNode : public SDNode {
SDUse Op;

1207public:
explicit HandleSDNode(SDValue X)
  : SDNode(ISD::HANDLENODE, 0, DebugLoc(), getSDVTList(MVT::Other)) {
  // HandleSDNodes are never inserted into the DAG, so they won't be
  // auto-numbered. Use ID 65535 as a sentinel.
  PersistentId = 0xffff;

  // Manually set up the operand list. This node type is special in that it's
  // always stack allocated and SelectionDAG does not manage its operands.
  // TODO: This should either (a) not be in the SDNode hierarchy, or (b) not
  // be so special.
  Op.setUser(this);
  Op.setInitial(X);
  NumOperands = 1;
  OperandList = &Op;
}
~HandleSDNode();

const SDValue &getValue() const { return Op; }
1226};

1228class AddrSpaceCastSDNode : public SDNode {
1229private:
unsigned SrcAddrSpace;
unsigned DestAddrSpace;

1233public:
AddrSpaceCastSDNode(unsigned Order, const DebugLoc &dl, EVT VT,
                    unsigned SrcAS, unsigned DestAS);

unsigned getSrcAddressSpace() const { return SrcAddrSpace; }
unsigned getDestAddressSpace() const { return DestAddrSpace; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::ADDRSPACECAST;
}
1243};

1245/// This is an abstract virtual class for memory operations.
1246class MemSDNode : public SDNode {
1247private:
// VT of in-memory value.
EVT MemoryVT;

1251protected:
/// Memory reference information.
MachineMemOperand *MMO;

1255public:
MemSDNode(unsigned Opc, unsigned Order, const DebugLoc &dl, SDVTList VTs,
          EVT memvt, MachineMemOperand *MMO);

bool readMem() const { return MMO->isLoad(); }
bool writeMem() const { return MMO->isStore(); }

/// Returns alignment and volatility of the memory access
Align getOriginalAlign() const { return MMO->getBaseAlign(); }
Align getAlign() const { return MMO->getAlign(); }
// FIXME: Remove once transition to getAlign is over.
unsigned getAlignment() const { return MMO->getAlign().value(); }

/// Return the SubclassData value, without HasDebugValue. This contains an
/// encoding of the volatile flag, as well as bits used by subclasses. This
/// function should only be used to compute a FoldingSetNodeID value.
/// The HasDebugValue bit is masked out because CSE map needs to match
/// nodes with debug info with nodes without debug info. Same is about
/// isDivergent bit.
unsigned getRawSubclassData() const {
  uint16_t Data;
  union {
    char RawSDNodeBits[sizeof(uint16_t)];
    SDNodeBitfields SDNodeBits;
  };
  memcpy(&RawSDNodeBits, &this->RawSDNodeBits, sizeof(this->RawSDNodeBits));
  SDNodeBits.HasDebugValue = 0;
  SDNodeBits.IsDivergent = false;
  memcpy(&Data, &RawSDNodeBits, sizeof(RawSDNodeBits));
  return Data;
}

bool isVolatile() const { return MemSDNodeBits.IsVolatile; }
bool isNonTemporal() const { return MemSDNodeBits.IsNonTemporal; }
bool isDereferenceable() const { return MemSDNodeBits.IsDereferenceable; }
bool isInvariant() const { return MemSDNodeBits.IsInvariant; }

// Returns the offset from the location of the access.
int64_t getSrcValueOffset() const { return MMO->getOffset(); }

/// Returns the AA info that describes the dereference.
AAMDNodes getAAInfo() const { return MMO->getAAInfo(); }

/// Returns the Ranges that describes the dereference.
const MDNode *getRanges() const { return MMO->getRanges(); }

/// Returns the synchronization scope ID for this memory operation.
SyncScope::ID getSyncScopeID() const { return MMO->getSyncScopeID(); }

/// Return the atomic ordering requirements for this memory operation. For
/// cmpxchg atomic operations, return the atomic ordering requirements when
/// store occurs.
AtomicOrdering getSuccessOrdering() const {
  return MMO->getSuccessOrdering();
}

/// Return a single atomic ordering that is at least as strong as both the
/// success and failure orderings for an atomic operation.  (For operations
/// other than cmpxchg, this is equivalent to getSuccessOrdering().)
AtomicOrdering getMergedOrdering() const { return MMO->getMergedOrdering(); }

/// Return true if the memory operation ordering is Unordered or higher.
bool isAtomic() const { return MMO->isAtomic(); }

/// Returns true if the memory operation doesn't imply any ordering
/// constraints on surrounding memory operations beyond the normal memory
/// aliasing rules.
bool isUnordered() const { return MMO->isUnordered(); }

/// Returns true if the memory operation is neither atomic or volatile.
bool isSimple() const { return !isAtomic() && !isVolatile(); }

/// Return the type of the in-memory value.
EVT getMemoryVT() const { return MemoryVT; }

/// Return a MachineMemOperand object describing the memory
/// reference performed by operation.
MachineMemOperand *getMemOperand() const { return MMO; }

const MachinePointerInfo &getPointerInfo() const {
  return MMO->getPointerInfo();
}

/// Return the address space for the associated pointer
unsigned getAddressSpace() const {
  return getPointerInfo().getAddrSpace();
}

/// Update this MemSDNode's MachineMemOperand information
/// to reflect the alignment of NewMMO, if it has a greater alignment.
/// This must only be used when the new alignment applies to all users of
/// this MachineMemOperand.
void refineAlignment(const MachineMemOperand *NewMMO) {
  MMO->refineAlignment(NewMMO);
}

const SDValue &getChain() const { return getOperand(0); }

const SDValue &getBasePtr() const {
  switch (getOpcode()) {
  case ISD::STORE:
  case ISD::MSTORE:
    return getOperand(2);
  case ISD::MGATHER:
  case ISD::MSCATTER:
    return getOperand(3);
  default:
    return getOperand(1);
  }
}

// Methods to support isa and dyn_cast
static bool classof(const SDNode *N) {
  // For some targets, we lower some target intrinsics to a MemIntrinsicNode
  // with either an intrinsic or a target opcode.
  switch (N->getOpcode()) {
  case ISD::LOAD:
  case ISD::STORE:
  case ISD::PREFETCH:
  case ISD::ATOMIC_CMP_SWAP:
  case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS:
  case ISD::ATOMIC_SWAP:
  case ISD::ATOMIC_LOAD_ADD:
  case ISD::ATOMIC_LOAD_SUB:
  case ISD::ATOMIC_LOAD_AND:
  case ISD::ATOMIC_LOAD_CLR:
  case ISD::ATOMIC_LOAD_OR:
  case ISD::ATOMIC_LOAD_XOR:
  case ISD::ATOMIC_LOAD_NAND:
  case ISD::ATOMIC_LOAD_MIN:
  case ISD::ATOMIC_LOAD_MAX:
  case ISD::ATOMIC_LOAD_UMIN:
  case ISD::ATOMIC_LOAD_UMAX:
  case ISD::ATOMIC_LOAD_FADD:
  case ISD::ATOMIC_LOAD_FSUB:
  case ISD::ATOMIC_LOAD:
  case ISD::ATOMIC_STORE:
  case ISD::MLOAD:
  case ISD::MSTORE:
  case ISD::MGATHER:
  case ISD::MSCATTER:
    return true;
  default:
    return N->isMemIntrinsic() || N->isTargetMemoryOpcode();
  }
}
1401};

1403/// This is an SDNode representing atomic operations.
1404class AtomicSDNode : public MemSDNode {
1405public:
AtomicSDNode(unsigned Opc, unsigned Order, const DebugLoc &dl, SDVTList VTL,
             EVT MemVT, MachineMemOperand *MMO)
  : MemSDNode(Opc, Order, dl, VTL, MemVT, MMO) {
  assert(((Opc != ISD::ATOMIC_LOAD && Opc != ISD::ATOMIC_STORE) ||((void)0)
          MMO->isAtomic()) && "then why are we using an AtomicSDNode?")((void)0);
}

const SDValue &getBasePtr() const { return getOperand(1); }
const SDValue &getVal() const { return getOperand(2); }

/// Returns true if this SDNode represents cmpxchg atomic operation, false
/// otherwise.
bool isCompareAndSwap() const {
  unsigned Op = getOpcode();
  return Op == ISD::ATOMIC_CMP_SWAP ||
         Op == ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS;
}

/// For cmpxchg atomic operations, return the atomic ordering requirements
/// when store does not occur.
AtomicOrdering getFailureOrdering() const {
  assert(isCompareAndSwap() && "Must be cmpxchg operation")((void)0);
  return MMO->getFailureOrdering();
}

// Methods to support isa and dyn_cast
static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::ATOMIC_CMP_SWAP     ||
         N->getOpcode() == ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS ||
         N->getOpcode() == ISD::ATOMIC_SWAP         ||
         N->getOpcode() == ISD::ATOMIC_LOAD_ADD     ||
         N->getOpcode() == ISD::ATOMIC_LOAD_SUB     ||
         N->getOpcode() == ISD::ATOMIC_LOAD_AND     ||
         N->getOpcode() == ISD::ATOMIC_LOAD_CLR     ||
         N->getOpcode() == ISD::ATOMIC_LOAD_OR      ||
         N->getOpcode() == ISD::ATOMIC_LOAD_XOR     ||
         N->getOpcode() == ISD::ATOMIC_LOAD_NAND    ||
         N->getOpcode() == ISD::ATOMIC_LOAD_MIN     ||
         N->getOpcode() == ISD::ATOMIC_LOAD_MAX     ||
         N->getOpcode() == ISD::ATOMIC_LOAD_UMIN    ||
         N->getOpcode() == ISD::ATOMIC_LOAD_UMAX    ||
         N->getOpcode() == ISD::ATOMIC_LOAD_FADD    ||
         N->getOpcode() == ISD::ATOMIC_LOAD_FSUB    ||
         N->getOpcode() == ISD::ATOMIC_LOAD         ||
         N->getOpcode() == ISD::ATOMIC_STORE;
}
1452};

1454/// This SDNode is used for target intrinsics that touch
1455/// memory and need an associated MachineMemOperand. Its opcode may be
1456/// INTRINSIC_VOID, INTRINSIC_W_CHAIN, PREFETCH, or a target-specific opcode
1457/// with a value not less than FIRST_TARGET_MEMORY_OPCODE.
1458class MemIntrinsicSDNode : public MemSDNode {
1459public:
MemIntrinsicSDNode(unsigned Opc, unsigned Order, const DebugLoc &dl,
                   SDVTList VTs, EVT MemoryVT, MachineMemOperand *MMO)
    : MemSDNode(Opc, Order, dl, VTs, MemoryVT, MMO) {
  SDNodeBits.IsMemIntrinsic = true;
}

// Methods to support isa and dyn_cast
static bool classof(const SDNode *N) {
  // We lower some target intrinsics to their target opcode
  // early a node with a target opcode can be of this class
  return N->isMemIntrinsic()             ||
         N->getOpcode() == ISD::PREFETCH ||
         N->isTargetMemoryOpcode();
}
1474};

1476/// This SDNode is used to implement the code generator
1477/// support for the llvm IR shufflevector instruction.  It combines elements
1478/// from two input vectors into a new input vector, with the selection and
1479/// ordering of elements determined by an array of integers, referred to as
1480/// the shuffle mask.  For input vectors of width N, mask indices of 0..N-1
1481/// refer to elements from the LHS input, and indices from N to 2N-1 the RHS.
1482/// An index of -1 is treated as undef, such that the code generator may put
1483/// any value in the corresponding element of the result.
1484class ShuffleVectorSDNode : public SDNode {
// The memory for Mask is owned by the SelectionDAG's OperandAllocator, and
// is freed when the SelectionDAG object is destroyed.
const int *Mask;

1489protected:
friend class SelectionDAG;

ShuffleVectorSDNode(EVT VT, unsigned Order, const DebugLoc &dl, const int *M)
    : SDNode(ISD::VECTOR_SHUFFLE, Order, dl, getSDVTList(VT)), Mask(M) {}

1495public:
ArrayRef<int> getMask() const {
  EVT VT = getValueType(0);
  return makeArrayRef(Mask, VT.getVectorNumElements());
}

int getMaskElt(unsigned Idx) const {
  assert(Idx < getValueType(0).getVectorNumElements() && "Idx out of range!")((void)0);
  return Mask[Idx];
}

bool isSplat() const { return isSplatMask(Mask, getValueType(0)); }

int getSplatIndex() const {
  assert(isSplat() && "Cannot get splat index for non-splat!")((void)0);
  EVT VT = getValueType(0);
  for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i)
    if (Mask[i] >= 0)
      return Mask[i];

  // We can choose any index value here and be correct because all elements
  // are undefined. Return 0 for better potential for callers to simplify.
  return 0;
}

static bool isSplatMask(const int *Mask, EVT VT);

/// Change values in a shuffle permute mask assuming
/// the two vector operands have swapped position.
static void commuteMask(MutableArrayRef<int> Mask) {
  unsigned NumElems = Mask.size();
  for (unsigned i = 0; i != NumElems; ++i) {
    int idx = Mask[i];
    if (idx < 0)
      continue;
    else if (idx < (int)NumElems)
      Mask[i] = idx + NumElems;
    else
      Mask[i] = idx - NumElems;
  }
}

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::VECTOR_SHUFFLE;
}
1540};

1542class ConstantSDNode : public SDNode {
friend class SelectionDAG;

const ConstantInt *Value;

ConstantSDNode(bool isTarget, bool isOpaque, const ConstantInt *val, EVT VT)
    : SDNode(isTarget ? ISD::TargetConstant : ISD::Constant, 0, DebugLoc(),
             getSDVTList(VT)),
      Value(val) {
  ConstantSDNodeBits.IsOpaque = isOpaque;
}

1554public:
const ConstantInt *getConstantIntValue() const { return Value; }
const APInt &getAPIntValue() const { return Value->getValue(); }
uint64_t getZExtValue() const { return Value->getZExtValue(); }
int64_t getSExtValue() const { return Value->getSExtValue(); }
uint64_t getLimitedValue(uint64_t Limit = UINT64_MAX0xffffffffffffffffULL) {
  return Value->getLimitedValue(Limit);
}
MaybeAlign getMaybeAlignValue() const { return Value->getMaybeAlignValue(); }
Align getAlignValue() const { return Value->getAlignValue(); }

bool isOne() const { return Value->isOne(); }
bool isNullValue() const { return Value->isZero(); }
bool isAllOnesValue() const { return Value->isMinusOne(); }
bool isMaxSignedValue() const { return Value->isMaxValue(true); }
bool isMinSignedValue() const { return Value->isMinValue(true); }

bool isOpaque() const { return ConstantSDNodeBits.IsOpaque; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::Constant ||
         N->getOpcode() == ISD::TargetConstant;
}
1577};

1579uint64_t SDNode::getConstantOperandVal(unsigned Num) const {
return cast<ConstantSDNode>(getOperand(Num))->getZExtValue();
1581}

1583const APInt &SDNode::getConstantOperandAPInt(unsigned Num) const {
return cast<ConstantSDNode>(getOperand(Num))->getAPIntValue();
1585}

1587class ConstantFPSDNode : public SDNode {
friend class SelectionDAG;

const ConstantFP *Value;

ConstantFPSDNode(bool isTarget, const ConstantFP *val, EVT VT)
    : SDNode(isTarget ? ISD::TargetConstantFP : ISD::ConstantFP, 0,
             DebugLoc(), getSDVTList(VT)),
      Value(val) {}

1597public:
const APFloat& getValueAPF() const { return Value->getValueAPF(); }
const ConstantFP *getConstantFPValue() const { return Value; }

/// Return true if the value is positive or negative zero.
bool isZero() const { return Value->isZero(); }

/// Return true if the value is a NaN.
bool isNaN() const { return Value->isNaN(); }

/// Return true if the value is an infinity
bool isInfinity() const { return Value->isInfinity(); }

/// Return true if the value is negative.
bool isNegative() const { return Value->isNegative(); }

/// We don't rely on operator== working on double values, as
/// it returns true for things that are clearly not equal, like -0.0 and 0.0.
/// As such, this method can be used to do an exact bit-for-bit comparison of
/// two floating point values.

/// We leave the version with the double argument here because it's just so
/// convenient to write "2.0" and the like.  Without this function we'd
/// have to duplicate its logic everywhere it's called.
bool isExactlyValue(double V) const {
  return Value->getValueAPF().isExactlyValue(V);
}
bool isExactlyValue(const APFloat& V) const;

static bool isValueValidForType(EVT VT, const APFloat& Val);

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::ConstantFP ||
         N->getOpcode() == ISD::TargetConstantFP;
}
1632};

1634/// Returns true if \p V is a constant integer zero.
1635bool isNullConstant(SDValue V);

1637/// Returns true if \p V is an FP constant with a value of positive zero.
1638bool isNullFPConstant(SDValue V);

1640/// Returns true if \p V is an integer constant with all bits set.
1641bool isAllOnesConstant(SDValue V);

1643/// Returns true if \p V is a constant integer one.
1644bool isOneConstant(SDValue V);

1646/// Return the non-bitcasted source operand of \p V if it exists.
1647/// If \p V is not a bitcasted value, it is returned as-is.
1648SDValue peekThroughBitcasts(SDValue V);

1650/// Return the non-bitcasted and one-use source operand of \p V if it exists.
1651/// If \p V is not a bitcasted one-use value, it is returned as-is.
1652SDValue peekThroughOneUseBitcasts(SDValue V);

1654/// Return the non-extracted vector source operand of \p V if it exists.
1655/// If \p V is not an extracted subvector, it is returned as-is.
1656SDValue peekThroughExtractSubvectors(SDValue V);

1658/// Returns true if \p V is a bitwise not operation. Assumes that an all ones
1659/// constant is canonicalized to be operand 1.
1660bool isBitwiseNot(SDValue V, bool AllowUndefs = false);

1662/// Returns the SDNode if it is a constant splat BuildVector or constant int.
1663ConstantSDNode *isConstOrConstSplat(SDValue N, bool AllowUndefs = false,
                                  bool AllowTruncation = false);

1666/// Returns the SDNode if it is a demanded constant splat BuildVector or
1667/// constant int.
1668ConstantSDNode *isConstOrConstSplat(SDValue N, const APInt &DemandedElts,
                                  bool AllowUndefs = false,
                                  bool AllowTruncation = false);

1672/// Returns the SDNode if it is a constant splat BuildVector or constant float.
1673ConstantFPSDNode *isConstOrConstSplatFP(SDValue N, bool AllowUndefs = false);

1675/// Returns the SDNode if it is a demanded constant splat BuildVector or
1676/// constant float.
1677ConstantFPSDNode *isConstOrConstSplatFP(SDValue N, const APInt &DemandedElts,
                                      bool AllowUndefs = false);

1680/// Return true if the value is a constant 0 integer or a splatted vector of
1681/// a constant 0 integer (with no undefs by default).
1682/// Build vector implicit truncation is not an issue for null values.
1683bool isNullOrNullSplat(SDValue V, bool AllowUndefs = false);

1685/// Return true if the value is a constant 1 integer or a splatted vector of a
1686/// constant 1 integer (with no undefs).
1687/// Does not permit build vector implicit truncation.
1688bool isOneOrOneSplat(SDValue V, bool AllowUndefs = false);

1690/// Return true if the value is a constant -1 integer or a splatted vector of a
1691/// constant -1 integer (with no undefs).
1692/// Does not permit build vector implicit truncation.
1693bool isAllOnesOrAllOnesSplat(SDValue V, bool AllowUndefs = false);

1695/// Return true if \p V is either a integer or FP constant.
1696inline bool isIntOrFPConstant(SDValue V) {
return isa<ConstantSDNode>(V) || isa<ConstantFPSDNode>(V);
1698}

1700class GlobalAddressSDNode : public SDNode {
friend class SelectionDAG;

const GlobalValue *TheGlobal;
int64_t Offset;
unsigned TargetFlags;

GlobalAddressSDNode(unsigned Opc, unsigned Order, const DebugLoc &DL,
                    const GlobalValue *GA, EVT VT, int64_t o,
                    unsigned TF);

1711public:
const GlobalValue *getGlobal() const { return TheGlobal; }
int64_t getOffset() const { return Offset; }
unsigned getTargetFlags() const { return TargetFlags; }
// Return the address space this GlobalAddress belongs to.
unsigned getAddressSpace() const;

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::GlobalAddress ||
         N->getOpcode() == ISD::TargetGlobalAddress ||
         N->getOpcode() == ISD::GlobalTLSAddress ||
         N->getOpcode() == ISD::TargetGlobalTLSAddress;
}
1724};

1726class FrameIndexSDNode : public SDNode {
friend class SelectionDAG;

int FI;

FrameIndexSDNode(int fi, EVT VT, bool isTarg)
  : SDNode(isTarg ? ISD::TargetFrameIndex : ISD::FrameIndex,
    0, DebugLoc(), getSDVTList(VT)), FI(fi) {
}

1736public:
int getIndex() const { return FI; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::FrameIndex ||
         N->getOpcode() == ISD::TargetFrameIndex;
}
1743};

1745/// This SDNode is used for LIFETIME_START/LIFETIME_END values, which indicate
1746/// the offet and size that are started/ended in the underlying FrameIndex.
1747class LifetimeSDNode : public SDNode {
friend class SelectionDAG;
int64_t Size;
int64_t Offset; // -1 if offset is unknown.

LifetimeSDNode(unsigned Opcode, unsigned Order, const DebugLoc &dl,
               SDVTList VTs, int64_t Size, int64_t Offset)
    : SDNode(Opcode, Order, dl, VTs), Size(Size), Offset(Offset) {}
1755public:
int64_t getFrameIndex() const {
  return cast<FrameIndexSDNode>(getOperand(1))->getIndex();
}

bool hasOffset() const { return Offset >= 0; }
int64_t getOffset() const {
  assert(hasOffset() && "offset is unknown")((void)0);
  return Offset;
}
int64_t getSize() const {
  assert(hasOffset() && "offset is unknown")((void)0);
  return Size;
}

// Methods to support isa and dyn_cast
static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::LIFETIME_START ||
         N->getOpcode() == ISD::LIFETIME_END;
}
1775};

1777/// This SDNode is used for PSEUDO_PROBE values, which are the function guid and
1778/// the index of the basic block being probed. A pseudo probe serves as a place
1779/// holder and will be removed at the end of compilation. It does not have any
1780/// operand because we do not want the instruction selection to deal with any.
1781class PseudoProbeSDNode : public SDNode {
friend class SelectionDAG;
uint64_t Guid;
uint64_t Index;
uint32_t Attributes;

PseudoProbeSDNode(unsigned Opcode, unsigned Order, const DebugLoc &Dl,
                  SDVTList VTs, uint64_t Guid, uint64_t Index, uint32_t Attr)
    : SDNode(Opcode, Order, Dl, VTs), Guid(Guid), Index(Index),
      Attributes(Attr) {}

1792public:
uint64_t getGuid() const { return Guid; }
uint64_t getIndex() const { return Index; }
uint32_t getAttributes() const { return Attributes; }

// Methods to support isa and dyn_cast
static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::PSEUDO_PROBE;
}
1801};

1803class JumpTableSDNode : public SDNode {
friend class SelectionDAG;

int JTI;
unsigned TargetFlags;

JumpTableSDNode(int jti, EVT VT, bool isTarg, unsigned TF)
  : SDNode(isTarg ? ISD::TargetJumpTable : ISD::JumpTable,
    0, DebugLoc(), getSDVTList(VT)), JTI(jti), TargetFlags(TF) {
}

1814public:
int getIndex() const { return JTI; }
unsigned getTargetFlags() const { return TargetFlags; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::JumpTable ||
         N->getOpcode() == ISD::TargetJumpTable;
}
1822};

1824class ConstantPoolSDNode : public SDNode {
friend class SelectionDAG;

union {
  const Constant *ConstVal;
  MachineConstantPoolValue *MachineCPVal;
} Val;
int Offset;  // It's a MachineConstantPoolValue if top bit is set.
Align Alignment; // Minimum alignment requirement of CP.
unsigned TargetFlags;

ConstantPoolSDNode(bool isTarget, const Constant *c, EVT VT, int o,
                   Align Alignment, unsigned TF)
    : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, 0,
             DebugLoc(), getSDVTList(VT)),
      Offset(o), Alignment(Alignment), TargetFlags(TF) {
  assert(Offset >= 0 && "Offset is too large")((void)0);
  Val.ConstVal = c;
}

ConstantPoolSDNode(bool isTarget, MachineConstantPoolValue *v, EVT VT, int o,
                   Align Alignment, unsigned TF)
    : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, 0,
             DebugLoc(), getSDVTList(VT)),
      Offset(o), Alignment(Alignment), TargetFlags(TF) {
  assert(Offset >= 0 && "Offset is too large")((void)0);
  Val.MachineCPVal = v;
  Offset |= 1 << (sizeof(unsigned)*CHAR_BIT8-1);
}

1854public:
bool isMachineConstantPoolEntry() const {
  return Offset < 0;
}

const Constant *getConstVal() const {
  assert(!isMachineConstantPoolEntry() && "Wrong constantpool type")((void)0);
  return Val.ConstVal;
}

MachineConstantPoolValue *getMachineCPVal() const {
  assert(isMachineConstantPoolEntry() && "Wrong constantpool type")((void)0);
  return Val.MachineCPVal;
}

int getOffset() const {
  return Offset & ~(1 << (sizeof(unsigned)*CHAR_BIT8-1));
}

// Return the alignment of this constant pool object, which is either 0 (for
// default alignment) or the desired value.
Align getAlign() const { return Alignment; }
unsigned getTargetFlags() const { return TargetFlags; }

Type *getType() const;

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::ConstantPool ||
         N->getOpcode() == ISD::TargetConstantPool;
}
1884};

1886/// Completely target-dependent object reference.
1887class TargetIndexSDNode : public SDNode {
friend class SelectionDAG;

unsigned TargetFlags;
int Index;
int64_t Offset;

1894public:
TargetIndexSDNode(int Idx, EVT VT, int64_t Ofs, unsigned TF)
    : SDNode(ISD::TargetIndex, 0, DebugLoc(), getSDVTList(VT)),
      TargetFlags(TF), Index(Idx), Offset(Ofs) {}

unsigned getTargetFlags() const { return TargetFlags; }
int getIndex() const { return Index; }
int64_t getOffset() const { return Offset; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::TargetIndex;
}
1906};

1908class BasicBlockSDNode : public SDNode {
friend class SelectionDAG;

MachineBasicBlock *MBB;

/// Debug info is meaningful and potentially useful here, but we create
/// blocks out of order when they're jumped to, which makes it a bit
/// harder.  Let's see if we need it first.
explicit BasicBlockSDNode(MachineBasicBlock *mbb)
  : SDNode(ISD::BasicBlock, 0, DebugLoc(), getSDVTList(MVT::Other)), MBB(mbb)
{}

1920public:
MachineBasicBlock *getBasicBlock() const { return MBB; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::BasicBlock;
}
1926};

1928/// A "pseudo-class" with methods for operating on BUILD_VECTORs.
1929class BuildVectorSDNode : public SDNode {
1930public:
// These are constructed as SDNodes and then cast to BuildVectorSDNodes.
explicit BuildVectorSDNode() = delete;

/// Check if this is a constant splat, and if so, find the
/// smallest element size that splats the vector.  If MinSplatBits is
/// nonzero, the element size must be at least that large.  Note that the
/// splat element may be the entire vector (i.e., a one element vector).
/// Returns the splat element value in SplatValue.  Any undefined bits in
/// that value are zero, and the corresponding bits in the SplatUndef mask
/// are set.  The SplatBitSize value is set to the splat element size in
/// bits.  HasAnyUndefs is set to true if any bits in the vector are
/// undefined.  isBigEndian describes the endianness of the target.
bool isConstantSplat(APInt &SplatValue, APInt &SplatUndef,
                     unsigned &SplatBitSize, bool &HasAnyUndefs,
                     unsigned MinSplatBits = 0,
                     bool isBigEndian = false) const;

/// Returns the demanded splatted value or a null value if this is not a
/// splat.
///
/// The DemandedElts mask indicates the elements that must be in the splat.
/// If passed a non-null UndefElements bitvector, it will resize it to match
/// the vector width and set the bits where elements are undef.
SDValue getSplatValue(const APInt &DemandedElts,
                      BitVector *UndefElements = nullptr) const;

/// Returns the splatted value or a null value if this is not a splat.
///
/// If passed a non-null UndefElements bitvector, it will resize it to match
/// the vector width and set the bits where elements are undef.
SDValue getSplatValue(BitVector *UndefElements = nullptr) const;

/// Find the shortest repeating sequence of values in the build vector.
///
/// e.g. { u, X, u, X, u, u, X, u } -> { X }
///      { X, Y, u, Y, u, u, X, u } -> { X, Y }
///
/// Currently this must be a power-of-2 build vector.
/// The DemandedElts mask indicates the elements that must be present,
/// undemanded elements in Sequence may be null (SDValue()). If passed a
/// non-null UndefElements bitvector, it will resize it to match the original
/// vector width and set the bits where elements are undef. If result is
/// false, Sequence will be empty.
bool getRepeatedSequence(const APInt &DemandedElts,
                         SmallVectorImpl<SDValue> &Sequence,
                         BitVector *UndefElements = nullptr) const;

/// Find the shortest repeating sequence of values in the build vector.
///
/// e.g. { u, X, u, X, u, u, X, u } -> { X }
///      { X, Y, u, Y, u, u, X, u } -> { X, Y }
///
/// Currently this must be a power-of-2 build vector.
/// If passed a non-null UndefElements bitvector, it will resize it to match
/// the original vector width and set the bits where elements are undef.
/// If result is false, Sequence will be empty.
bool getRepeatedSequence(SmallVectorImpl<SDValue> &Sequence,
                         BitVector *UndefElements = nullptr) const;

/// Returns the demanded splatted constant or null if this is not a constant
/// splat.
///
/// The DemandedElts mask indicates the elements that must be in the splat.
/// If passed a non-null UndefElements bitvector, it will resize it to match
/// the vector width and set the bits where elements are undef.
ConstantSDNode *
getConstantSplatNode(const APInt &DemandedElts,
                     BitVector *UndefElements = nullptr) const;

/// Returns the splatted constant or null if this is not a constant
/// splat.
///
/// If passed a non-null UndefElements bitvector, it will resize it to match
/// the vector width and set the bits where elements are undef.
ConstantSDNode *
getConstantSplatNode(BitVector *UndefElements = nullptr) const;

/// Returns the demanded splatted constant FP or null if this is not a
/// constant FP splat.
///
/// The DemandedElts mask indicates the elements that must be in the splat.
/// If passed a non-null UndefElements bitvector, it will resize it to match
/// the vector width and set the bits where elements are undef.
ConstantFPSDNode *
getConstantFPSplatNode(const APInt &DemandedElts,
                       BitVector *UndefElements = nullptr) const;

/// Returns the splatted constant FP or null if this is not a constant
/// FP splat.
///
/// If passed a non-null UndefElements bitvector, it will resize it to match
/// the vector width and set the bits where elements are undef.
ConstantFPSDNode *
getConstantFPSplatNode(BitVector *UndefElements = nullptr) const;

/// If this is a constant FP splat and the splatted constant FP is an
/// exact power or 2, return the log base 2 integer value.  Otherwise,
/// return -1.
///
/// The BitWidth specifies the necessary bit precision.
int32_t getConstantFPSplatPow2ToLog2Int(BitVector *UndefElements,
                                        uint32_t BitWidth) const;

bool isConstant() const;

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::BUILD_VECTOR;
}
2039};

2041/// An SDNode that holds an arbitrary LLVM IR Value. This is
2042/// used when the SelectionDAG needs to make a simple reference to something
2043/// in the LLVM IR representation.
2044///
2045class SrcValueSDNode : public SDNode {
friend class SelectionDAG;

const Value *V;

/// Create a SrcValue for a general value.
explicit SrcValueSDNode(const Value *v)
  : SDNode(ISD::SRCVALUE, 0, DebugLoc(), getSDVTList(MVT::Other)), V(v) {}

2054public:
/// Return the contained Value.
const Value *getValue() const { return V; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::SRCVALUE;
}
2061};

2063class MDNodeSDNode : public SDNode {
friend class SelectionDAG;

const MDNode *MD;

explicit MDNodeSDNode(const MDNode *md)
: SDNode(ISD::MDNODE_SDNODE, 0, DebugLoc(), getSDVTList(MVT::Other)), MD(md)
{}

2072public:
const MDNode *getMD() const { return MD; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::MDNODE_SDNODE;
}
2078};

2080class RegisterSDNode : public SDNode {
friend class SelectionDAG;

Register Reg;

RegisterSDNode(Register reg, EVT VT)
  : SDNode(ISD::Register, 0, DebugLoc(), getSDVTList(VT)), Reg(reg) {}

2088public:
Register getReg() const { return Reg; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::Register;
}
2094};

2096class RegisterMaskSDNode : public SDNode {
friend class SelectionDAG;

// The memory for RegMask is not owned by the node.
const uint32_t *RegMask;

RegisterMaskSDNode(const uint32_t *mask)
  : SDNode(ISD::RegisterMask, 0, DebugLoc(), getSDVTList(MVT::Untyped)),
    RegMask(mask) {}

2106public:
const uint32_t *getRegMask() const { return RegMask; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::RegisterMask;
}
2112};

2114class BlockAddressSDNode : public SDNode {
friend class SelectionDAG;

const BlockAddress *BA;
int64_t Offset;
unsigned TargetFlags;

BlockAddressSDNode(unsigned NodeTy, EVT VT, const BlockAddress *ba,
                   int64_t o, unsigned Flags)
  : SDNode(NodeTy, 0, DebugLoc(), getSDVTList(VT)),
           BA(ba), Offset(o), TargetFlags(Flags) {}

2126public:
const BlockAddress *getBlockAddress() const { return BA; }
int64_t getOffset() const { return Offset; }
unsigned getTargetFlags() const { return TargetFlags; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::BlockAddress ||
         N->getOpcode() == ISD::TargetBlockAddress;
}
2135};

2137class LabelSDNode : public SDNode {
friend class SelectionDAG;

MCSymbol *Label;

LabelSDNode(unsigned Opcode, unsigned Order, const DebugLoc &dl, MCSymbol *L)
    : SDNode(Opcode, Order, dl, getSDVTList(MVT::Other)), Label(L) {
  assert(LabelSDNode::classof(this) && "not a label opcode")((void)0);
}

2147public:
MCSymbol *getLabel() const { return Label; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::EH_LABEL ||
         N->getOpcode() == ISD::ANNOTATION_LABEL;
}
2154};

2156class ExternalSymbolSDNode : public SDNode {
friend class SelectionDAG;

const char *Symbol;
unsigned TargetFlags;

ExternalSymbolSDNode(bool isTarget, const char *Sym, unsigned TF, EVT VT)
    : SDNode(isTarget ? ISD::TargetExternalSymbol : ISD::ExternalSymbol, 0,
             DebugLoc(), getSDVTList(VT)),
      Symbol(Sym), TargetFlags(TF) {}

2167public:
const char *getSymbol() const { return Symbol; }
unsigned getTargetFlags() const { return TargetFlags; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::ExternalSymbol ||
         N->getOpcode() == ISD::TargetExternalSymbol;
}
2175};

2177class MCSymbolSDNode : public SDNode {
friend class SelectionDAG;

MCSymbol *Symbol;

MCSymbolSDNode(MCSymbol *Symbol, EVT VT)
    : SDNode(ISD::MCSymbol, 0, DebugLoc(), getSDVTList(VT)), Symbol(Symbol) {}

2185public:
MCSymbol *getMCSymbol() const { return Symbol; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::MCSymbol;
}
2191};

2193class CondCodeSDNode : public SDNode {
friend class SelectionDAG;

ISD::CondCode Condition;

explicit CondCodeSDNode(ISD::CondCode Cond)
  : SDNode(ISD::CONDCODE, 0, DebugLoc(), getSDVTList(MVT::Other)),
    Condition(Cond) {}

2202public:
ISD::CondCode get() const { return Condition; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::CONDCODE;
}
2208};

2210/// This class is used to represent EVT's, which are used
2211/// to parameterize some operations.
2212class VTSDNode : public SDNode {
friend class SelectionDAG;

EVT ValueType;

explicit VTSDNode(EVT VT)
  : SDNode(ISD::VALUETYPE, 0, DebugLoc(), getSDVTList(MVT::Other)),
    ValueType(VT) {}

2221public:
EVT getVT() const { return ValueType; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::VALUETYPE;
}
2227};

2229/// Base class for LoadSDNode and StoreSDNode
2230class LSBaseSDNode : public MemSDNode {
2231public:
LSBaseSDNode(ISD::NodeType NodeTy, unsigned Order, const DebugLoc &dl,
             SDVTList VTs, ISD::MemIndexedMode AM, EVT MemVT,
             MachineMemOperand *MMO)
    : MemSDNode(NodeTy, Order, dl, VTs, MemVT, MMO) {
  LSBaseSDNodeBits.AddressingMode = AM;
  assert(getAddressingMode() == AM && "Value truncated")((void)0);
}

const SDValue &getOffset() const {
  return getOperand(getOpcode() == ISD::LOAD ? 2 : 3);
}

/// Return the addressing mode for this load or store:
/// unindexed, pre-inc, pre-dec, post-inc, or post-dec.
ISD::MemIndexedMode getAddressingMode() const {
  return static_cast<ISD::MemIndexedMode>(LSBaseSDNodeBits.AddressingMode);
}

/// Return true if this is a pre/post inc/dec load/store.
bool isIndexed() const { return getAddressingMode() != ISD::UNINDEXED; }

/// Return true if this is NOT a pre/post inc/dec load/store.
bool isUnindexed() const { return getAddressingMode() == ISD::UNINDEXED; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::LOAD ||
         N->getOpcode() == ISD::STORE;
}
2260};

2262/// This class is used to represent ISD::LOAD nodes.
2263class LoadSDNode : public LSBaseSDNode {
friend class SelectionDAG;

LoadSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
           ISD::MemIndexedMode AM, ISD::LoadExtType ETy, EVT MemVT,
           MachineMemOperand *MMO)
    : LSBaseSDNode(ISD::LOAD, Order, dl, VTs, AM, MemVT, MMO) {
  LoadSDNodeBits.ExtTy = ETy;
  assert(readMem() && "Load MachineMemOperand is not a load!")((void)0);
  assert(!writeMem() && "Load MachineMemOperand is a store!")((void)0);
}

2275public:
/// Return whether this is a plain node,
/// or one of the varieties of value-extending loads.
ISD::LoadExtType getExtensionType() const {
  return static_cast<ISD::LoadExtType>(LoadSDNodeBits.ExtTy);
}

const SDValue &getBasePtr() const { return getOperand(1); }
const SDValue &getOffset() const { return getOperand(2); }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::LOAD;
}
2288};

2290/// This class is used to represent ISD::STORE nodes.
2291class StoreSDNode : public LSBaseSDNode {
friend class SelectionDAG;

StoreSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
            ISD::MemIndexedMode AM, bool isTrunc, EVT MemVT,
            MachineMemOperand *MMO)
    : LSBaseSDNode(ISD::STORE, Order, dl, VTs, AM, MemVT, MMO) {
  StoreSDNodeBits.IsTruncating = isTrunc;
  assert(!readMem() && "Store MachineMemOperand is a load!")((void)0);
  assert(writeMem() && "Store MachineMemOperand is not a store!")((void)0);
}

2303public:
/// Return true if the op does a truncation before store.
/// For integers this is the same as doing a TRUNCATE and storing the result.
/// For floats, it is the same as doing an FP_ROUND and storing the result.
bool isTruncatingStore() const { return StoreSDNodeBits.IsTruncating; }
void setTruncatingStore(bool Truncating) {
  StoreSDNodeBits.IsTruncating = Truncating;
}

const SDValue &getValue() const { return getOperand(1); }
const SDValue &getBasePtr() const { return getOperand(2); }
const SDValue &getOffset() const { return getOperand(3); }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::STORE;
}
2319};

2321/// This base class is used to represent MLOAD and MSTORE nodes
2322class MaskedLoadStoreSDNode : public MemSDNode {
2323public:
friend class SelectionDAG;

MaskedLoadStoreSDNode(ISD::NodeType NodeTy, unsigned Order,
                      const DebugLoc &dl, SDVTList VTs,
                      ISD::MemIndexedMode AM, EVT MemVT,
                      MachineMemOperand *MMO)
    : MemSDNode(NodeTy, Order, dl, VTs, MemVT, MMO) {
  LSBaseSDNodeBits.AddressingMode = AM;
  assert(getAddressingMode() == AM && "Value truncated")((void)0);
}

// MaskedLoadSDNode (Chain, ptr, offset, mask, passthru)
// MaskedStoreSDNode (Chain, data, ptr, offset, mask)
// Mask is a vector of i1 elements
const SDValue &getOffset() const {
  return getOperand(getOpcode() == ISD::MLOAD ? 2 : 3);
}
const SDValue &getMask() const {
  return getOperand(getOpcode() == ISD::MLOAD ? 3 : 4);
}

/// Return the addressing mode for this load or store:
/// unindexed, pre-inc, pre-dec, post-inc, or post-dec.
ISD::MemIndexedMode getAddressingMode() const {
  return static_cast<ISD::MemIndexedMode>(LSBaseSDNodeBits.AddressingMode);
}

/// Return true if this is a pre/post inc/dec load/store.
bool isIndexed() const { return getAddressingMode() != ISD::UNINDEXED; }

/// Return true if this is NOT a pre/post inc/dec load/store.
bool isUnindexed() const { return getAddressingMode() == ISD::UNINDEXED; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::MLOAD ||
         N->getOpcode() == ISD::MSTORE;
}
2361};

2363/// This class is used to represent an MLOAD node
2364class MaskedLoadSDNode : public MaskedLoadStoreSDNode {
2365public:
friend class SelectionDAG;

MaskedLoadSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
                 ISD::MemIndexedMode AM, ISD::LoadExtType ETy,
                 bool IsExpanding, EVT MemVT, MachineMemOperand *MMO)
    : MaskedLoadStoreSDNode(ISD::MLOAD, Order, dl, VTs, AM, MemVT, MMO) {
  LoadSDNodeBits.ExtTy = ETy;
  LoadSDNodeBits.IsExpanding = IsExpanding;
}

ISD::LoadExtType getExtensionType() const {
  return static_cast<ISD::LoadExtType>(LoadSDNodeBits.ExtTy);
}

const SDValue &getBasePtr() const { return getOperand(1); }
const SDValue &getOffset() const { return getOperand(2); }
const SDValue &getMask() const { return getOperand(3); }
const SDValue &getPassThru() const { return getOperand(4); }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::MLOAD;
}

bool isExpandingLoad() const { return LoadSDNodeBits.IsExpanding; }
2390};

2392/// This class is used to represent an MSTORE node
2393class MaskedStoreSDNode : public MaskedLoadStoreSDNode {
2394public:
friend class SelectionDAG;

MaskedStoreSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
                  ISD::MemIndexedMode AM, bool isTrunc, bool isCompressing,
                  EVT MemVT, MachineMemOperand *MMO)
    : MaskedLoadStoreSDNode(ISD::MSTORE, Order, dl, VTs, AM, MemVT, MMO) {
  StoreSDNodeBits.IsTruncating = isTrunc;
  StoreSDNodeBits.IsCompressing = isCompressing;
}

/// Return true if the op does a truncation before store.
/// For integers this is the same as doing a TRUNCATE and storing the result.
/// For floats, it is the same as doing an FP_ROUND and storing the result.
bool isTruncatingStore() const { return StoreSDNodeBits.IsTruncating; }

/// Returns true if the op does a compression to the vector before storing.
/// The node contiguously stores the active elements (integers or floats)
/// in src (those with their respective bit set in writemask k) to unaligned
/// memory at base_addr.
bool isCompressingStore() const { return StoreSDNodeBits.IsCompressing; }

const SDValue &getValue() const { return getOperand(1); }
const SDValue &getBasePtr() const { return getOperand(2); }
const SDValue &getOffset() const { return getOperand(3); }
const SDValue &getMask() const { return getOperand(4); }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::MSTORE;
}
2424};

2426/// This is a base class used to represent
2427/// MGATHER and MSCATTER nodes
2428///
2429class MaskedGatherScatterSDNode : public MemSDNode {
2430public:
friend class SelectionDAG;

MaskedGatherScatterSDNode(ISD::NodeType NodeTy, unsigned Order,
                          const DebugLoc &dl, SDVTList VTs, EVT MemVT,
                          MachineMemOperand *MMO, ISD::MemIndexType IndexType)
    : MemSDNode(NodeTy, Order, dl, VTs, MemVT, MMO) {
  LSBaseSDNodeBits.AddressingMode = IndexType;
  assert(getIndexType() == IndexType && "Value truncated")((void)0);
}

/// How is Index applied to BasePtr when computing addresses.
ISD::MemIndexType getIndexType() const {
  return static_cast<ISD::MemIndexType>(LSBaseSDNodeBits.AddressingMode);
}
void setIndexType(ISD::MemIndexType IndexType) {
  LSBaseSDNodeBits.AddressingMode = IndexType;
}
bool isIndexScaled() const {
  return (getIndexType() == ISD::SIGNED_SCALED) ||
         (getIndexType() == ISD::UNSIGNED_SCALED);
}
bool isIndexSigned() const {
  return (getIndexType() == ISD::SIGNED_SCALED) ||
         (getIndexType() == ISD::SIGNED_UNSCALED);
}

// In the both nodes address is Op1, mask is Op2:
// MaskedGatherSDNode  (Chain, passthru, mask, base, index, scale)
// MaskedScatterSDNode (Chain, value, mask, base, index, scale)
// Mask is a vector of i1 elements
const SDValue &getBasePtr() const { return getOperand(3); }
const SDValue &getIndex()   const { return getOperand(4); }
const SDValue &getMask()    const { return getOperand(2); }
const SDValue &getScale()   const { return getOperand(5); }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::MGATHER ||
         N->getOpcode() == ISD::MSCATTER;
}
2470};

2472/// This class is used to represent an MGATHER node
2473///
2474class MaskedGatherSDNode : public MaskedGatherScatterSDNode {
2475public:
friend class SelectionDAG;

MaskedGatherSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
                   EVT MemVT, MachineMemOperand *MMO,
                   ISD::MemIndexType IndexType, ISD::LoadExtType ETy)
    : MaskedGatherScatterSDNode(ISD::MGATHER, Order, dl, VTs, MemVT, MMO,
                                IndexType) {
  LoadSDNodeBits.ExtTy = ETy;
}

const SDValue &getPassThru() const { return getOperand(1); }

ISD::LoadExtType getExtensionType() const {
  return ISD::LoadExtType(LoadSDNodeBits.ExtTy);
}

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::MGATHER;
}
2495};

2497/// This class is used to represent an MSCATTER node
2498///
2499class MaskedScatterSDNode : public MaskedGatherScatterSDNode {
2500public:
friend class SelectionDAG;

MaskedScatterSDNode(unsigned Order, const DebugLoc &dl, SDVTList VTs,
                    EVT MemVT, MachineMemOperand *MMO,
                    ISD::MemIndexType IndexType, bool IsTrunc)
    : MaskedGatherScatterSDNode(ISD::MSCATTER, Order, dl, VTs, MemVT, MMO,
                                IndexType) {
  StoreSDNodeBits.IsTruncating = IsTrunc;
}

/// Return true if the op does a truncation before store.
/// For integers this is the same as doing a TRUNCATE and storing the result.
/// For floats, it is the same as doing an FP_ROUND and storing the result.
bool isTruncatingStore() const { return StoreSDNodeBits.IsTruncating; }

const SDValue &getValue() const { return getOperand(1); }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::MSCATTER;
}
2521};

2523/// An SDNode that represents everything that will be needed
2524/// to construct a MachineInstr. These nodes are created during the
2525/// instruction selection proper phase.
2526///
2527/// Note that the only supported way to set the `memoperands` is by calling the
2528/// `SelectionDAG::setNodeMemRefs` function as the memory management happens
2529/// inside the DAG rather than in the node.
2530class MachineSDNode : public SDNode {
2531private:
friend class SelectionDAG;

MachineSDNode(unsigned Opc, unsigned Order, const DebugLoc &DL, SDVTList VTs)
    : SDNode(Opc, Order, DL, VTs) {}

// We use a pointer union between a single `MachineMemOperand` pointer and
// a pointer to an array of `MachineMemOperand` pointers. This is null when
// the number of these is zero, the single pointer variant used when the
// number is one, and the array is used for larger numbers.
//
// The array is allocated via the `SelectionDAG`'s allocator and so will
// always live until the DAG is cleaned up and doesn't require ownership here.
//
// We can't use something simpler like `TinyPtrVector` here because `SDNode`
// subclasses aren't managed in a conforming C++ manner. See the comments on
// `SelectionDAG::MorphNodeTo` which details what all goes on, but the
// constraint here is that these don't manage memory with their constructor or
// destructor and can be initialized to a good state even if they start off
// uninitialized.
PointerUnion<MachineMemOperand *, MachineMemOperand **> MemRefs = {};

// Note that this could be folded into the above `MemRefs` member if doing so
// is advantageous at some point. We don't need to store this in most cases.
// However, at the moment this doesn't appear to make the allocation any
// smaller and makes the code somewhat simpler to read.
int NumMemRefs = 0;

2559public:
using mmo_iterator = ArrayRef<MachineMemOperand *>::const_iterator;

ArrayRef<MachineMemOperand *> memoperands() const {
  // Special case the common cases.
  if (NumMemRefs == 0)
    return {};
  if (NumMemRefs == 1)
    return makeArrayRef(MemRefs.getAddrOfPtr1(), 1);

  // Otherwise we have an actual array.
  return makeArrayRef(MemRefs.get<MachineMemOperand **>(), NumMemRefs);
}
mmo_iterator memoperands_begin() const { return memoperands().begin(); }
mmo_iterator memoperands_end() const { return memoperands().end(); }
bool memoperands_empty() const { return memoperands().empty(); }

/// Clear out the memory reference descriptor list.
void clearMemRefs() {
  MemRefs = nullptr;
  NumMemRefs = 0;
}

static bool classof(const SDNode *N) {
  return N->isMachineOpcode();
}
2585};

2587/// An SDNode that records if a register contains a value that is guaranteed to
2588/// be aligned accordingly.
2589class AssertAlignSDNode : public SDNode {
Align Alignment;

2592public:
AssertAlignSDNode(unsigned Order, const DebugLoc &DL, EVT VT, Align A)
    : SDNode(ISD::AssertAlign, Order, DL, getSDVTList(VT)), Alignment(A) {}

Align getAlign() const { return Alignment; }

static bool classof(const SDNode *N) {
  return N->getOpcode() == ISD::AssertAlign;
}
2601};

2603class SDNodeIterator {
const SDNode *Node;
unsigned Operand;

SDNodeIterator(const SDNode *N, unsigned Op) : Node(N), Operand(Op) {}

2609public:
using iterator_category = std::forward_iterator_tag;
using value_type = SDNode;
using difference_type = std::ptrdiff_t;
using pointer = value_type *;
using reference = value_type &;

bool operator==(const SDNodeIterator& x) const {
  return Operand == x.Operand;
}
bool operator!=(const SDNodeIterator& x) const { return !operator==(x); }

pointer operator*() const {
  return Node->getOperand(Operand).getNode();
}
pointer operator->() const { return operator*(); }

SDNodeIterator& operator++() {                // Preincrement
  ++Operand;
  return *this;
}
SDNodeIterator operator++(int) { // Postincrement
  SDNodeIterator tmp = *this; ++*this; return tmp;
}
size_t operator-(SDNodeIterator Other) const {
  assert(Node == Other.Node &&((void)0)
         "Cannot compare iterators of two different nodes!")((void)0);
  return Operand - Other.Operand;
}

static SDNodeIterator begin(const SDNode *N) { return SDNodeIterator(N, 0); }
static SDNodeIterator end  (const SDNode *N) {
  return SDNodeIterator(N, N->getNumOperands());
}

unsigned getOperand() const { return Operand; }
const SDNode *getNode() const { return Node; }
2646};

2648template <> struct GraphTraits<SDNode*> {
using NodeRef = SDNode *;
using ChildIteratorType = SDNodeIterator;

static NodeRef getEntryNode(SDNode *N) { return N; }

static ChildIteratorType child_begin(NodeRef N) {
  return SDNodeIterator::begin(N);
}

static ChildIteratorType child_end(NodeRef N) {
  return SDNodeIterator::end(N);
}
2661};

2663/// A representation of the largest SDNode, for use in sizeof().
2664///
2665/// This needs to be a union because the largest node differs on 32 bit systems
2666/// with 4 and 8 byte pointer alignment, respectively.
2667using LargestSDNode = AlignedCharArrayUnion<AtomicSDNode, TargetIndexSDNode,
                                          BlockAddressSDNode,
                                          GlobalAddressSDNode,
                                          PseudoProbeSDNode>;

2672/// The SDNode class with the greatest alignment requirement.
2673using MostAlignedSDNode = GlobalAddressSDNode;

2675namespace ISD {

/// Returns true if the specified node is a non-extending and unindexed load.
inline bool isNormalLoad(const SDNode *N) {
  const LoadSDNode *Ld = dyn_cast<LoadSDNode>(N);
  return Ld && Ld->getExtensionType() == ISD::NON_EXTLOAD &&
    Ld->getAddressingMode() == ISD::UNINDEXED;
}

/// Returns true if the specified node is a non-extending load.
inline bool isNON_EXTLoad(const SDNode *N) {
  return isa<LoadSDNode>(N) &&
    cast<LoadSDNode>(N)->getExtensionType() == ISD::NON_EXTLOAD;
}

/// Returns true if the specified node is a EXTLOAD.
inline bool isEXTLoad(const SDNode *N) {
  return isa<LoadSDNode>(N) &&
    cast<LoadSDNode>(N)->getExtensionType() == ISD::EXTLOAD;
}

/// Returns true if the specified node is a SEXTLOAD.
inline bool isSEXTLoad(const SDNode *N) {
  return isa<LoadSDNode>(N) &&
    cast<LoadSDNode>(N)->getExtensionType() == ISD::SEXTLOAD;
}

/// Returns true if the specified node is a ZEXTLOAD.
inline bool isZEXTLoad(const SDNode *N) {
  return isa<LoadSDNode>(N) &&
    cast<LoadSDNode>(N)->getExtensionType() == ISD::ZEXTLOAD;
}

/// Returns true if the specified node is an unindexed load.
inline bool isUNINDEXEDLoad(const SDNode *N) {
  return isa<LoadSDNode>(N) &&
    cast<LoadSDNode>(N)->getAddressingMode() == ISD::UNINDEXED;
}

/// Returns true if the specified node is a non-truncating
/// and unindexed store.
inline bool isNormalStore(const SDNode *N) {
  const StoreSDNode *St = dyn_cast<StoreSDNode>(N);
  return St && !St->isTruncatingStore() &&
    St->getAddressingMode() == ISD::UNINDEXED;
}

/// Returns true if the specified node is an unindexed store.
inline bool isUNINDEXEDStore(const SDNode *N) {
  return isa<StoreSDNode>(N) &&
    cast<StoreSDNode>(N)->getAddressingMode() == ISD::UNINDEXED;
}

/// Attempt to match a unary predicate against a scalar/splat constant or
/// every element of a constant BUILD_VECTOR.
/// If AllowUndef is true, then UNDEF elements will pass nullptr to Match.
bool matchUnaryPredicate(SDValue Op,
                         std::function<bool(ConstantSDNode *)> Match,
                         bool AllowUndefs = false);

/// Attempt to match a binary predicate against a pair of scalar/splat
/// constants or every element of a pair of constant BUILD_VECTORs.
/// If AllowUndef is true, then UNDEF elements will pass nullptr to Match.
/// If AllowTypeMismatch is true then RetType + ArgTypes don't need to match.
bool matchBinaryPredicate(
    SDValue LHS, SDValue RHS,
    std::function<bool(ConstantSDNode *, ConstantSDNode *)> Match,
    bool AllowUndefs = false, bool AllowTypeMismatch = false);

/// Returns true if the specified value is the overflow result from one
/// of the overflow intrinsic nodes.
inline bool isOverflowIntrOpRes(SDValue Op) {
  unsigned Opc = Op.getOpcode();
  return (Op.getResNo() == 1 &&
          (Opc == ISD::SADDO || Opc == ISD::UADDO || Opc == ISD::SSUBO ||
           Opc == ISD::USUBO || Opc == ISD::SMULO || Opc == ISD::UMULO));
}

2753} // end namespace ISD

2755} // end namespace llvm

2757#endif // LLVM_CODEGEN_SELECTIONDAGNODES_H