Bug Summary

File:src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
Warning:line 647, column 3
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 SIInstrInfo.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 static -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" -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 -stack-protector 2 -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/SIInstrInfo.cpp
1//===- SIInstrInfo.cpp - SI Instruction Information ----------------------===//
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/// SI Implementation of TargetInstrInfo.
11//
12//===----------------------------------------------------------------------===//
13
14#include "SIInstrInfo.h"
15#include "AMDGPU.h"
16#include "AMDGPUInstrInfo.h"
17#include "GCNHazardRecognizer.h"
18#include "GCNSubtarget.h"
19#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
20#include "SIMachineFunctionInfo.h"
21#include "llvm/Analysis/ValueTracking.h"
22#include "llvm/CodeGen/LiveVariables.h"
23#include "llvm/CodeGen/MachineDominators.h"
24#include "llvm/CodeGen/RegisterScavenging.h"
25#include "llvm/CodeGen/ScheduleDAG.h"
26#include "llvm/IR/DiagnosticInfo.h"
27#include "llvm/IR/IntrinsicsAMDGPU.h"
28#include "llvm/MC/MCContext.h"
29#include "llvm/Support/CommandLine.h"
30#include "llvm/Target/TargetMachine.h"
31
32using namespace llvm;
33
34#define DEBUG_TYPE"si-instr-info" "si-instr-info"
35
36#define GET_INSTRINFO_CTOR_DTOR
37#include "AMDGPUGenInstrInfo.inc"
38
39namespace llvm {
40
41class AAResults;
42
43namespace AMDGPU {
44#define GET_D16ImageDimIntrinsics_IMPL
45#define GET_ImageDimIntrinsicTable_IMPL
46#define GET_RsrcIntrinsics_IMPL
47#include "AMDGPUGenSearchableTables.inc"
48}
49}
50
51
52// Must be at least 4 to be able to branch over minimum unconditional branch
53// code. This is only for making it possible to write reasonably small tests for
54// long branches.
55static cl::opt<unsigned>
56BranchOffsetBits("amdgpu-s-branch-bits", cl::ReallyHidden, cl::init(16),
57 cl::desc("Restrict range of branch instructions (DEBUG)"));
58
59static cl::opt<bool> Fix16BitCopies(
60 "amdgpu-fix-16-bit-physreg-copies",
61 cl::desc("Fix copies between 32 and 16 bit registers by extending to 32 bit"),
62 cl::init(true),
63 cl::ReallyHidden);
64
65SIInstrInfo::SIInstrInfo(const GCNSubtarget &ST)
66 : AMDGPUGenInstrInfo(AMDGPU::ADJCALLSTACKUP, AMDGPU::ADJCALLSTACKDOWN),
67 RI(ST), ST(ST) {
68 SchedModel.init(&ST);
69}
70
71//===----------------------------------------------------------------------===//
72// TargetInstrInfo callbacks
73//===----------------------------------------------------------------------===//
74
75static unsigned getNumOperandsNoGlue(SDNode *Node) {
76 unsigned N = Node->getNumOperands();
77 while (N && Node->getOperand(N - 1).getValueType() == MVT::Glue)
78 --N;
79 return N;
80}
81
82/// Returns true if both nodes have the same value for the given
83/// operand \p Op, or if both nodes do not have this operand.
84static bool nodesHaveSameOperandValue(SDNode *N0, SDNode* N1, unsigned OpName) {
85 unsigned Opc0 = N0->getMachineOpcode();
86 unsigned Opc1 = N1->getMachineOpcode();
87
88 int Op0Idx = AMDGPU::getNamedOperandIdx(Opc0, OpName);
89 int Op1Idx = AMDGPU::getNamedOperandIdx(Opc1, OpName);
90
91 if (Op0Idx == -1 && Op1Idx == -1)
92 return true;
93
94
95 if ((Op0Idx == -1 && Op1Idx != -1) ||
96 (Op1Idx == -1 && Op0Idx != -1))
97 return false;
98
99 // getNamedOperandIdx returns the index for the MachineInstr's operands,
100 // which includes the result as the first operand. We are indexing into the
101 // MachineSDNode's operands, so we need to skip the result operand to get
102 // the real index.
103 --Op0Idx;
104 --Op1Idx;
105
106 return N0->getOperand(Op0Idx) == N1->getOperand(Op1Idx);
107}
108
109bool SIInstrInfo::isReallyTriviallyReMaterializable(const MachineInstr &MI,
110 AAResults *AA) const {
111 if (isVOP1(MI) || isVOP2(MI) || isVOP3(MI) || isSDWA(MI)) {
112 // Normally VALU use of exec would block the rematerialization, but that
113 // is OK in this case to have an implicit exec read as all VALU do.
114 // We really want all of the generic logic for this except for this.
115
116 // Another potential implicit use is mode register. The core logic of
117 // the RA will not attempt rematerialization if mode is set anywhere
118 // in the function, otherwise it is safe since mode is not changed.
119 return !MI.hasImplicitDef() &&
120 MI.getNumImplicitOperands() == MI.getDesc().getNumImplicitUses() &&
121 !MI.mayRaiseFPException();
122 }
123
124 return false;
125}
126
127bool SIInstrInfo::isIgnorableUse(const MachineOperand &MO) const {
128 // Any implicit use of exec by VALU is not a real register read.
129 return MO.getReg() == AMDGPU::EXEC && MO.isImplicit() &&
130 isVALU(*MO.getParent());
131}
132
133bool SIInstrInfo::areLoadsFromSameBasePtr(SDNode *Load0, SDNode *Load1,
134 int64_t &Offset0,
135 int64_t &Offset1) const {
136 if (!Load0->isMachineOpcode() || !Load1->isMachineOpcode())
137 return false;
138
139 unsigned Opc0 = Load0->getMachineOpcode();
140 unsigned Opc1 = Load1->getMachineOpcode();
141
142 // Make sure both are actually loads.
143 if (!get(Opc0).mayLoad() || !get(Opc1).mayLoad())
144 return false;
145
146 if (isDS(Opc0) && isDS(Opc1)) {
147
148 // FIXME: Handle this case:
149 if (getNumOperandsNoGlue(Load0) != getNumOperandsNoGlue(Load1))
150 return false;
151
152 // Check base reg.
153 if (Load0->getOperand(0) != Load1->getOperand(0))
154 return false;
155
156 // Skip read2 / write2 variants for simplicity.
157 // TODO: We should report true if the used offsets are adjacent (excluded
158 // st64 versions).
159 int Offset0Idx = AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::offset);
160 int Offset1Idx = AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::offset);
161 if (Offset0Idx == -1 || Offset1Idx == -1)
162 return false;
163
164 // XXX - be careful of datalesss loads
165 // getNamedOperandIdx returns the index for MachineInstrs. Since they
166 // include the output in the operand list, but SDNodes don't, we need to
167 // subtract the index by one.
168 Offset0Idx -= get(Opc0).NumDefs;
169 Offset1Idx -= get(Opc1).NumDefs;
170 Offset0 = cast<ConstantSDNode>(Load0->getOperand(Offset0Idx))->getZExtValue();
171 Offset1 = cast<ConstantSDNode>(Load1->getOperand(Offset1Idx))->getZExtValue();
172 return true;
173 }
174
175 if (isSMRD(Opc0) && isSMRD(Opc1)) {
176 // Skip time and cache invalidation instructions.
177 if (AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::sbase) == -1 ||
178 AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::sbase) == -1)
179 return false;
180
181 assert(getNumOperandsNoGlue(Load0) == getNumOperandsNoGlue(Load1))((void)0);
182
183 // Check base reg.
184 if (Load0->getOperand(0) != Load1->getOperand(0))
185 return false;
186
187 const ConstantSDNode *Load0Offset =
188 dyn_cast<ConstantSDNode>(Load0->getOperand(1));
189 const ConstantSDNode *Load1Offset =
190 dyn_cast<ConstantSDNode>(Load1->getOperand(1));
191
192 if (!Load0Offset || !Load1Offset)
193 return false;
194
195 Offset0 = Load0Offset->getZExtValue();
196 Offset1 = Load1Offset->getZExtValue();
197 return true;
198 }
199
200 // MUBUF and MTBUF can access the same addresses.
201 if ((isMUBUF(Opc0) || isMTBUF(Opc0)) && (isMUBUF(Opc1) || isMTBUF(Opc1))) {
202
203 // MUBUF and MTBUF have vaddr at different indices.
204 if (!nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::soffset) ||
205 !nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::vaddr) ||
206 !nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::srsrc))
207 return false;
208
209 int OffIdx0 = AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::offset);
210 int OffIdx1 = AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::offset);
211
212 if (OffIdx0 == -1 || OffIdx1 == -1)
213 return false;
214
215 // getNamedOperandIdx returns the index for MachineInstrs. Since they
216 // include the output in the operand list, but SDNodes don't, we need to
217 // subtract the index by one.
218 OffIdx0 -= get(Opc0).NumDefs;
219 OffIdx1 -= get(Opc1).NumDefs;
220
221 SDValue Off0 = Load0->getOperand(OffIdx0);
222 SDValue Off1 = Load1->getOperand(OffIdx1);
223
224 // The offset might be a FrameIndexSDNode.
225 if (!isa<ConstantSDNode>(Off0) || !isa<ConstantSDNode>(Off1))
226 return false;
227
228 Offset0 = cast<ConstantSDNode>(Off0)->getZExtValue();
229 Offset1 = cast<ConstantSDNode>(Off1)->getZExtValue();
230 return true;
231 }
232
233 return false;
234}
235
236static bool isStride64(unsigned Opc) {
237 switch (Opc) {
238 case AMDGPU::DS_READ2ST64_B32:
239 case AMDGPU::DS_READ2ST64_B64:
240 case AMDGPU::DS_WRITE2ST64_B32:
241 case AMDGPU::DS_WRITE2ST64_B64:
242 return true;
243 default:
244 return false;
245 }
246}
247
248bool SIInstrInfo::getMemOperandsWithOffsetWidth(
249 const MachineInstr &LdSt, SmallVectorImpl<const MachineOperand *> &BaseOps,
250 int64_t &Offset, bool &OffsetIsScalable, unsigned &Width,
251 const TargetRegisterInfo *TRI) const {
252 if (!LdSt.mayLoadOrStore())
253 return false;
254
255 unsigned Opc = LdSt.getOpcode();
256 OffsetIsScalable = false;
257 const MachineOperand *BaseOp, *OffsetOp;
258 int DataOpIdx;
259
260 if (isDS(LdSt)) {
261 BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::addr);
262 OffsetOp = getNamedOperand(LdSt, AMDGPU::OpName::offset);
263 if (OffsetOp) {
264 // Normal, single offset LDS instruction.
265 if (!BaseOp) {
266 // DS_CONSUME/DS_APPEND use M0 for the base address.
267 // TODO: find the implicit use operand for M0 and use that as BaseOp?
268 return false;
269 }
270 BaseOps.push_back(BaseOp);
271 Offset = OffsetOp->getImm();
272 // Get appropriate operand, and compute width accordingly.
273 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst);
274 if (DataOpIdx == -1)
275 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data0);
276 Width = getOpSize(LdSt, DataOpIdx);
277 } else {
278 // The 2 offset instructions use offset0 and offset1 instead. We can treat
279 // these as a load with a single offset if the 2 offsets are consecutive.
280 // We will use this for some partially aligned loads.
281 const MachineOperand *Offset0Op =
282 getNamedOperand(LdSt, AMDGPU::OpName::offset0);
283 const MachineOperand *Offset1Op =
284 getNamedOperand(LdSt, AMDGPU::OpName::offset1);
285
286 unsigned Offset0 = Offset0Op->getImm();
287 unsigned Offset1 = Offset1Op->getImm();
288 if (Offset0 + 1 != Offset1)
289 return false;
290
291 // Each of these offsets is in element sized units, so we need to convert
292 // to bytes of the individual reads.
293
294 unsigned EltSize;
295 if (LdSt.mayLoad())
296 EltSize = TRI->getRegSizeInBits(*getOpRegClass(LdSt, 0)) / 16;
297 else {
298 assert(LdSt.mayStore())((void)0);
299 int Data0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data0);
300 EltSize = TRI->getRegSizeInBits(*getOpRegClass(LdSt, Data0Idx)) / 8;
301 }
302
303 if (isStride64(Opc))
304 EltSize *= 64;
305
306 BaseOps.push_back(BaseOp);
307 Offset = EltSize * Offset0;
308 // Get appropriate operand(s), and compute width accordingly.
309 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst);
310 if (DataOpIdx == -1) {
311 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data0);
312 Width = getOpSize(LdSt, DataOpIdx);
313 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data1);
314 Width += getOpSize(LdSt, DataOpIdx);
315 } else {
316 Width = getOpSize(LdSt, DataOpIdx);
317 }
318 }
319 return true;
320 }
321
322 if (isMUBUF(LdSt) || isMTBUF(LdSt)) {
323 const MachineOperand *RSrc = getNamedOperand(LdSt, AMDGPU::OpName::srsrc);
324 if (!RSrc) // e.g. BUFFER_WBINVL1_VOL
325 return false;
326 BaseOps.push_back(RSrc);
327 BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::vaddr);
328 if (BaseOp && !BaseOp->isFI())
329 BaseOps.push_back(BaseOp);
330 const MachineOperand *OffsetImm =
331 getNamedOperand(LdSt, AMDGPU::OpName::offset);
332 Offset = OffsetImm->getImm();
333 const MachineOperand *SOffset =
334 getNamedOperand(LdSt, AMDGPU::OpName::soffset);
335 if (SOffset) {
336 if (SOffset->isReg())
337 BaseOps.push_back(SOffset);
338 else
339 Offset += SOffset->getImm();
340 }
341 // Get appropriate operand, and compute width accordingly.
342 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst);
343 if (DataOpIdx == -1)
344 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdata);
345 Width = getOpSize(LdSt, DataOpIdx);
346 return true;
347 }
348
349 if (isMIMG(LdSt)) {
350 int SRsrcIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::srsrc);
351 BaseOps.push_back(&LdSt.getOperand(SRsrcIdx));
352 int VAddr0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vaddr0);
353 if (VAddr0Idx >= 0) {
354 // GFX10 possible NSA encoding.
355 for (int I = VAddr0Idx; I < SRsrcIdx; ++I)
356 BaseOps.push_back(&LdSt.getOperand(I));
357 } else {
358 BaseOps.push_back(getNamedOperand(LdSt, AMDGPU::OpName::vaddr));
359 }
360 Offset = 0;
361 // Get appropriate operand, and compute width accordingly.
362 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdata);
363 Width = getOpSize(LdSt, DataOpIdx);
364 return true;
365 }
366
367 if (isSMRD(LdSt)) {
368 BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::sbase);
369 if (!BaseOp) // e.g. S_MEMTIME
370 return false;
371 BaseOps.push_back(BaseOp);
372 OffsetOp = getNamedOperand(LdSt, AMDGPU::OpName::offset);
373 Offset = OffsetOp ? OffsetOp->getImm() : 0;
374 // Get appropriate operand, and compute width accordingly.
375 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::sdst);
376 Width = getOpSize(LdSt, DataOpIdx);
377 return true;
378 }
379
380 if (isFLAT(LdSt)) {
381 // Instructions have either vaddr or saddr or both or none.
382 BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::vaddr);
383 if (BaseOp)
384 BaseOps.push_back(BaseOp);
385 BaseOp = getNamedOperand(LdSt, AMDGPU::OpName::saddr);
386 if (BaseOp)
387 BaseOps.push_back(BaseOp);
388 Offset = getNamedOperand(LdSt, AMDGPU::OpName::offset)->getImm();
389 // Get appropriate operand, and compute width accordingly.
390 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst);
391 if (DataOpIdx == -1)
392 DataOpIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdata);
393 Width = getOpSize(LdSt, DataOpIdx);
394 return true;
395 }
396
397 return false;
398}
399
400static bool memOpsHaveSameBasePtr(const MachineInstr &MI1,
401 ArrayRef<const MachineOperand *> BaseOps1,
402 const MachineInstr &MI2,
403 ArrayRef<const MachineOperand *> BaseOps2) {
404 // Only examine the first "base" operand of each instruction, on the
405 // assumption that it represents the real base address of the memory access.
406 // Other operands are typically offsets or indices from this base address.
407 if (BaseOps1.front()->isIdenticalTo(*BaseOps2.front()))
408 return true;
409
410 if (!MI1.hasOneMemOperand() || !MI2.hasOneMemOperand())
411 return false;
412
413 auto MO1 = *MI1.memoperands_begin();
414 auto MO2 = *MI2.memoperands_begin();
415 if (MO1->getAddrSpace() != MO2->getAddrSpace())
416 return false;
417
418 auto Base1 = MO1->getValue();
419 auto Base2 = MO2->getValue();
420 if (!Base1 || !Base2)
421 return false;
422 Base1 = getUnderlyingObject(Base1);
423 Base2 = getUnderlyingObject(Base2);
424
425 if (isa<UndefValue>(Base1) || isa<UndefValue>(Base2))
426 return false;
427
428 return Base1 == Base2;
429}
430
431bool SIInstrInfo::shouldClusterMemOps(ArrayRef<const MachineOperand *> BaseOps1,
432 ArrayRef<const MachineOperand *> BaseOps2,
433 unsigned NumLoads,
434 unsigned NumBytes) const {
435 // If the mem ops (to be clustered) do not have the same base ptr, then they
436 // should not be clustered
437 if (!BaseOps1.empty() && !BaseOps2.empty()) {
438 const MachineInstr &FirstLdSt = *BaseOps1.front()->getParent();
439 const MachineInstr &SecondLdSt = *BaseOps2.front()->getParent();
440 if (!memOpsHaveSameBasePtr(FirstLdSt, BaseOps1, SecondLdSt, BaseOps2))
441 return false;
442 } else if (!BaseOps1.empty() || !BaseOps2.empty()) {
443 // If only one base op is empty, they do not have the same base ptr
444 return false;
445 }
446
447 // In order to avoid regester pressure, on an average, the number of DWORDS
448 // loaded together by all clustered mem ops should not exceed 8. This is an
449 // empirical value based on certain observations and performance related
450 // experiments.
451 // The good thing about this heuristic is - it avoids clustering of too many
452 // sub-word loads, and also avoids clustering of wide loads. Below is the
453 // brief summary of how the heuristic behaves for various `LoadSize`.
454 // (1) 1 <= LoadSize <= 4: cluster at max 8 mem ops
455 // (2) 5 <= LoadSize <= 8: cluster at max 4 mem ops
456 // (3) 9 <= LoadSize <= 12: cluster at max 2 mem ops
457 // (4) 13 <= LoadSize <= 16: cluster at max 2 mem ops
458 // (5) LoadSize >= 17: do not cluster
459 const unsigned LoadSize = NumBytes / NumLoads;
460 const unsigned NumDWORDs = ((LoadSize + 3) / 4) * NumLoads;
461 return NumDWORDs <= 8;
462}
463
464// FIXME: This behaves strangely. If, for example, you have 32 load + stores,
465// the first 16 loads will be interleaved with the stores, and the next 16 will
466// be clustered as expected. It should really split into 2 16 store batches.
467//
468// Loads are clustered until this returns false, rather than trying to schedule
469// groups of stores. This also means we have to deal with saying different
470// address space loads should be clustered, and ones which might cause bank
471// conflicts.
472//
473// This might be deprecated so it might not be worth that much effort to fix.
474bool SIInstrInfo::shouldScheduleLoadsNear(SDNode *Load0, SDNode *Load1,
475 int64_t Offset0, int64_t Offset1,
476 unsigned NumLoads) const {
477 assert(Offset1 > Offset0 &&((void)0)
478 "Second offset should be larger than first offset!")((void)0);
479 // If we have less than 16 loads in a row, and the offsets are within 64
480 // bytes, then schedule together.
481
482 // A cacheline is 64 bytes (for global memory).
483 return (NumLoads <= 16 && (Offset1 - Offset0) < 64);
484}
485
486static void reportIllegalCopy(const SIInstrInfo *TII, MachineBasicBlock &MBB,
487 MachineBasicBlock::iterator MI,
488 const DebugLoc &DL, MCRegister DestReg,
489 MCRegister SrcReg, bool KillSrc,
490 const char *Msg = "illegal SGPR to VGPR copy") {
491 MachineFunction *MF = MBB.getParent();
492 DiagnosticInfoUnsupported IllegalCopy(MF->getFunction(), Msg, DL, DS_Error);
493 LLVMContext &C = MF->getFunction().getContext();
494 C.diagnose(IllegalCopy);
495
496 BuildMI(MBB, MI, DL, TII->get(AMDGPU::SI_ILLEGAL_COPY), DestReg)
497 .addReg(SrcReg, getKillRegState(KillSrc));
498}
499
500/// Handle copying from SGPR to AGPR, or from AGPR to AGPR. It is not possible
501/// to directly copy, so an intermediate VGPR needs to be used.
502static void indirectCopyToAGPR(const SIInstrInfo &TII,
503 MachineBasicBlock &MBB,
504 MachineBasicBlock::iterator MI,
505 const DebugLoc &DL, MCRegister DestReg,
506 MCRegister SrcReg, bool KillSrc,
507 RegScavenger &RS,
508 Register ImpDefSuperReg = Register(),
509 Register ImpUseSuperReg = Register()) {
510 const SIRegisterInfo &RI = TII.getRegisterInfo();
511
512 assert(AMDGPU::SReg_32RegClass.contains(SrcReg) ||((void)0)
513 AMDGPU::AGPR_32RegClass.contains(SrcReg))((void)0);
514
515 // First try to find defining accvgpr_write to avoid temporary registers.
516 for (auto Def = MI, E = MBB.begin(); Def != E; ) {
517 --Def;
518 if (!Def->definesRegister(SrcReg, &RI))
519 continue;
520 if (Def->getOpcode() != AMDGPU::V_ACCVGPR_WRITE_B32_e64)
521 break;
522
523 MachineOperand &DefOp = Def->getOperand(1);
524 assert(DefOp.isReg() || DefOp.isImm())((void)0);
525
526 if (DefOp.isReg()) {
527 // Check that register source operand if not clobbered before MI.
528 // Immediate operands are always safe to propagate.
529 bool SafeToPropagate = true;
530 for (auto I = Def; I != MI && SafeToPropagate; ++I)
531 if (I->modifiesRegister(DefOp.getReg(), &RI))
532 SafeToPropagate = false;
533
534 if (!SafeToPropagate)
535 break;
536
537 DefOp.setIsKill(false);
538 }
539
540 MachineInstrBuilder Builder =
541 BuildMI(MBB, MI, DL, TII.get(AMDGPU::V_ACCVGPR_WRITE_B32_e64), DestReg)
542 .add(DefOp);
543 if (ImpDefSuperReg)
544 Builder.addReg(ImpDefSuperReg, RegState::Define | RegState::Implicit);
545
546 if (ImpUseSuperReg) {
547 Builder.addReg(ImpUseSuperReg,
548 getKillRegState(KillSrc) | RegState::Implicit);
549 }
550
551 return;
552 }
553
554 RS.enterBasicBlock(MBB);
555 RS.forward(MI);
556
557 // Ideally we want to have three registers for a long reg_sequence copy
558 // to hide 2 waitstates between v_mov_b32 and accvgpr_write.
559 unsigned MaxVGPRs = RI.getRegPressureLimit(&AMDGPU::VGPR_32RegClass,
560 *MBB.getParent());
561
562 // Registers in the sequence are allocated contiguously so we can just
563 // use register number to pick one of three round-robin temps.
564 unsigned RegNo = DestReg % 3;
565 Register Tmp = RS.scavengeRegister(&AMDGPU::VGPR_32RegClass, 0);
566 if (!Tmp)
567 report_fatal_error("Cannot scavenge VGPR to copy to AGPR");
568 RS.setRegUsed(Tmp);
569
570 if (!TII.getSubtarget().hasGFX90AInsts()) {
571 // Only loop through if there are any free registers left, otherwise
572 // scavenger may report a fatal error without emergency spill slot
573 // or spill with the slot.
574 while (RegNo-- && RS.FindUnusedReg(&AMDGPU::VGPR_32RegClass)) {
575 Register Tmp2 = RS.scavengeRegister(&AMDGPU::VGPR_32RegClass, 0);
576 if (!Tmp2 || RI.getHWRegIndex(Tmp2) >= MaxVGPRs)
577 break;
578 Tmp = Tmp2;
579 RS.setRegUsed(Tmp);
580 }
581 }
582
583 // Insert copy to temporary VGPR.
584 unsigned TmpCopyOp = AMDGPU::V_MOV_B32_e32;
585 if (AMDGPU::AGPR_32RegClass.contains(SrcReg)) {
586 TmpCopyOp = AMDGPU::V_ACCVGPR_READ_B32_e64;
587 } else {
588 assert(AMDGPU::SReg_32RegClass.contains(SrcReg))((void)0);
589 }
590
591 MachineInstrBuilder UseBuilder = BuildMI(MBB, MI, DL, TII.get(TmpCopyOp), Tmp)
592 .addReg(SrcReg, getKillRegState(KillSrc));
593 if (ImpUseSuperReg) {
594 UseBuilder.addReg(ImpUseSuperReg,
595 getKillRegState(KillSrc) | RegState::Implicit);
596 }
597
598 MachineInstrBuilder DefBuilder
599 = BuildMI(MBB, MI, DL, TII.get(AMDGPU::V_ACCVGPR_WRITE_B32_e64), DestReg)
600 .addReg(Tmp, RegState::Kill);
601
602 if (ImpDefSuperReg)
603 DefBuilder.addReg(ImpDefSuperReg, RegState::Define | RegState::Implicit);
604}
605
606static void expandSGPRCopy(const SIInstrInfo &TII, MachineBasicBlock &MBB,
607 MachineBasicBlock::iterator MI, const DebugLoc &DL,
608 MCRegister DestReg, MCRegister SrcReg, bool KillSrc,
609 const TargetRegisterClass *RC, bool Forward) {
610 const SIRegisterInfo &RI = TII.getRegisterInfo();
611 ArrayRef<int16_t> BaseIndices = RI.getRegSplitParts(RC, 4);
612 MachineBasicBlock::iterator I = MI;
613 MachineInstr *FirstMI = nullptr, *LastMI = nullptr;
18
'FirstMI' initialized to a null pointer value
614
615 for (unsigned Idx = 0; Idx < BaseIndices.size(); ++Idx) {
19
Assuming the condition is false
20
Loop condition is false. Execution continues on line 643
616 int16_t SubIdx = BaseIndices[Idx];
617 Register Reg = RI.getSubReg(DestReg, SubIdx);
618 unsigned Opcode = AMDGPU::S_MOV_B32;
619
620 // Is SGPR aligned? If so try to combine with next.
621 Register Src = RI.getSubReg(SrcReg, SubIdx);
622 bool AlignedDest = ((Reg - AMDGPU::SGPR0) % 2) == 0;
623 bool AlignedSrc = ((Src - AMDGPU::SGPR0) % 2) == 0;
624 if (AlignedDest && AlignedSrc && (Idx + 1 < BaseIndices.size())) {
625 // Can use SGPR64 copy
626 unsigned Channel = RI.getChannelFromSubReg(SubIdx);
627 SubIdx = RI.getSubRegFromChannel(Channel, 2);
628 Opcode = AMDGPU::S_MOV_B64;
629 Idx++;
630 }
631
632 LastMI = BuildMI(MBB, I, DL, TII.get(Opcode), RI.getSubReg(DestReg, SubIdx))
633 .addReg(RI.getSubReg(SrcReg, SubIdx))
634 .addReg(SrcReg, RegState::Implicit);
635
636 if (!FirstMI)
637 FirstMI = LastMI;
638
639 if (!Forward)
640 I--;
641 }
642
643 assert(FirstMI && LastMI)((void)0);
644 if (!Forward)
21
Assuming 'Forward' is true
22
Taking false branch
645 std::swap(FirstMI, LastMI);
646
647 FirstMI->addOperand(
23
Called C++ object pointer is null
648 MachineOperand::CreateReg(DestReg, true /*IsDef*/, true /*IsImp*/));
649
650 if (KillSrc)
651 LastMI->addRegisterKilled(SrcReg, &RI);
652}
653
654void SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
655 MachineBasicBlock::iterator MI,
656 const DebugLoc &DL, MCRegister DestReg,
657 MCRegister SrcReg, bool KillSrc) const {
658 const TargetRegisterClass *RC = RI.getPhysRegClass(DestReg);
659
660 // FIXME: This is hack to resolve copies between 16 bit and 32 bit
661 // registers until all patterns are fixed.
662 if (Fix16BitCopies &&
1
Assuming the condition is false
663 ((RI.getRegSizeInBits(*RC) == 16) ^
664 (RI.getRegSizeInBits(*RI.getPhysRegClass(SrcReg)) == 16))) {
665 MCRegister &RegToFix = (RI.getRegSizeInBits(*RC) == 16) ? DestReg : SrcReg;
666 MCRegister Super = RI.get32BitRegister(RegToFix);
667 assert(RI.getSubReg(Super, AMDGPU::lo16) == RegToFix)((void)0);
668 RegToFix = Super;
669
670 if (DestReg == SrcReg) {
671 // Insert empty bundle since ExpandPostRA expects an instruction here.
672 BuildMI(MBB, MI, DL, get(AMDGPU::BUNDLE));
673 return;
674 }
675
676 RC = RI.getPhysRegClass(DestReg);
677 }
678
679 if (RC == &AMDGPU::VGPR_32RegClass) {
2
Assuming the condition is false
3
Taking false branch
680 assert(AMDGPU::VGPR_32RegClass.contains(SrcReg) ||((void)0)
681 AMDGPU::SReg_32RegClass.contains(SrcReg) ||((void)0)
682 AMDGPU::AGPR_32RegClass.contains(SrcReg))((void)0);
683 unsigned Opc = AMDGPU::AGPR_32RegClass.contains(SrcReg) ?
684 AMDGPU::V_ACCVGPR_READ_B32_e64 : AMDGPU::V_MOV_B32_e32;
685 BuildMI(MBB, MI, DL, get(Opc), DestReg)
686 .addReg(SrcReg, getKillRegState(KillSrc));
687 return;
688 }
689
690 if (RC == &AMDGPU::SReg_32_XM0RegClass ||
4
Assuming the condition is false
6
Taking false branch
691 RC == &AMDGPU::SReg_32RegClass) {
5
Assuming the condition is false
692 if (SrcReg == AMDGPU::SCC) {
693 BuildMI(MBB, MI, DL, get(AMDGPU::S_CSELECT_B32), DestReg)
694 .addImm(1)
695 .addImm(0);
696 return;
697 }
698
699 if (DestReg == AMDGPU::VCC_LO) {
700 if (AMDGPU::SReg_32RegClass.contains(SrcReg)) {
701 BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), AMDGPU::VCC_LO)
702 .addReg(SrcReg, getKillRegState(KillSrc));
703 } else {
704 // FIXME: Hack until VReg_1 removed.
705 assert(AMDGPU::VGPR_32RegClass.contains(SrcReg))((void)0);
706 BuildMI(MBB, MI, DL, get(AMDGPU::V_CMP_NE_U32_e32))
707 .addImm(0)
708 .addReg(SrcReg, getKillRegState(KillSrc));
709 }
710
711 return;
712 }
713
714 if (!AMDGPU::SReg_32RegClass.contains(SrcReg)) {
715 reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
716 return;
717 }
718
719 BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DestReg)
720 .addReg(SrcReg, getKillRegState(KillSrc));
721 return;
722 }
723
724 if (RC == &AMDGPU::SReg_64RegClass) {
7
Assuming the condition is false
8
Taking false branch
725 if (SrcReg == AMDGPU::SCC) {
726 BuildMI(MBB, MI, DL, get(AMDGPU::S_CSELECT_B64), DestReg)
727 .addImm(1)
728 .addImm(0);
729 return;
730 }
731
732 if (DestReg == AMDGPU::VCC) {
733 if (AMDGPU::SReg_64RegClass.contains(SrcReg)) {
734 BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), AMDGPU::VCC)
735 .addReg(SrcReg, getKillRegState(KillSrc));
736 } else {
737 // FIXME: Hack until VReg_1 removed.
738 assert(AMDGPU::VGPR_32RegClass.contains(SrcReg))((void)0);
739 BuildMI(MBB, MI, DL, get(AMDGPU::V_CMP_NE_U32_e32))
740 .addImm(0)
741 .addReg(SrcReg, getKillRegState(KillSrc));
742 }
743
744 return;
745 }
746
747 if (!AMDGPU::SReg_64RegClass.contains(SrcReg)) {
748 reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
749 return;
750 }
751
752 BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), DestReg)
753 .addReg(SrcReg, getKillRegState(KillSrc));
754 return;
755 }
756
757 if (DestReg == AMDGPU::SCC) {
9
Taking false branch
758 // Copying 64-bit or 32-bit sources to SCC barely makes sense,
759 // but SelectionDAG emits such copies for i1 sources.
760 if (AMDGPU::SReg_64RegClass.contains(SrcReg)) {
761 // This copy can only be produced by patterns
762 // with explicit SCC, which are known to be enabled
763 // only for subtargets with S_CMP_LG_U64 present.
764 assert(ST.hasScalarCompareEq64())((void)0);
765 BuildMI(MBB, MI, DL, get(AMDGPU::S_CMP_LG_U64))
766 .addReg(SrcReg, getKillRegState(KillSrc))
767 .addImm(0);
768 } else {
769 assert(AMDGPU::SReg_32RegClass.contains(SrcReg))((void)0);
770 BuildMI(MBB, MI, DL, get(AMDGPU::S_CMP_LG_U32))
771 .addReg(SrcReg, getKillRegState(KillSrc))
772 .addImm(0);
773 }
774
775 return;
776 }
777
778 if (RC == &AMDGPU::AGPR_32RegClass) {
10
Assuming the condition is false
11
Taking false branch
779 if (AMDGPU::VGPR_32RegClass.contains(SrcReg)) {
780 BuildMI(MBB, MI, DL, get(AMDGPU::V_ACCVGPR_WRITE_B32_e64), DestReg)
781 .addReg(SrcReg, getKillRegState(KillSrc));
782 return;
783 }
784
785 if (AMDGPU::AGPR_32RegClass.contains(SrcReg) && ST.hasGFX90AInsts()) {
786 BuildMI(MBB, MI, DL, get(AMDGPU::V_ACCVGPR_MOV_B32), DestReg)
787 .addReg(SrcReg, getKillRegState(KillSrc));
788 return;
789 }
790
791 // FIXME: Pass should maintain scavenger to avoid scan through the block on
792 // every AGPR spill.
793 RegScavenger RS;
794 indirectCopyToAGPR(*this, MBB, MI, DL, DestReg, SrcReg, KillSrc, RS);
795 return;
796 }
797
798 const unsigned Size = RI.getRegSizeInBits(*RC);
799 if (Size == 16) {
12
Assuming 'Size' is not equal to 16
13
Taking false branch
800 assert(AMDGPU::VGPR_LO16RegClass.contains(SrcReg) ||((void)0)
801 AMDGPU::VGPR_HI16RegClass.contains(SrcReg) ||((void)0)
802 AMDGPU::SReg_LO16RegClass.contains(SrcReg) ||((void)0)
803 AMDGPU::AGPR_LO16RegClass.contains(SrcReg))((void)0);
804
805 bool IsSGPRDst = AMDGPU::SReg_LO16RegClass.contains(DestReg);
806 bool IsSGPRSrc = AMDGPU::SReg_LO16RegClass.contains(SrcReg);
807 bool IsAGPRDst = AMDGPU::AGPR_LO16RegClass.contains(DestReg);
808 bool IsAGPRSrc = AMDGPU::AGPR_LO16RegClass.contains(SrcReg);
809 bool DstLow = AMDGPU::VGPR_LO16RegClass.contains(DestReg) ||
810 AMDGPU::SReg_LO16RegClass.contains(DestReg) ||
811 AMDGPU::AGPR_LO16RegClass.contains(DestReg);
812 bool SrcLow = AMDGPU::VGPR_LO16RegClass.contains(SrcReg) ||
813 AMDGPU::SReg_LO16RegClass.contains(SrcReg) ||
814 AMDGPU::AGPR_LO16RegClass.contains(SrcReg);
815 MCRegister NewDestReg = RI.get32BitRegister(DestReg);
816 MCRegister NewSrcReg = RI.get32BitRegister(SrcReg);
817
818 if (IsSGPRDst) {
819 if (!IsSGPRSrc) {
820 reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
821 return;
822 }
823
824 BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), NewDestReg)
825 .addReg(NewSrcReg, getKillRegState(KillSrc));
826 return;
827 }
828
829 if (IsAGPRDst || IsAGPRSrc) {
830 if (!DstLow || !SrcLow) {
831 reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc,
832 "Cannot use hi16 subreg with an AGPR!");
833 }
834
835 copyPhysReg(MBB, MI, DL, NewDestReg, NewSrcReg, KillSrc);
836 return;
837 }
838
839 if (IsSGPRSrc && !ST.hasSDWAScalar()) {
840 if (!DstLow || !SrcLow) {
841 reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc,
842 "Cannot use hi16 subreg on VI!");
843 }
844
845 BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), NewDestReg)
846 .addReg(NewSrcReg, getKillRegState(KillSrc));
847 return;
848 }
849
850 auto MIB = BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_sdwa), NewDestReg)
851 .addImm(0) // src0_modifiers
852 .addReg(NewSrcReg)
853 .addImm(0) // clamp
854 .addImm(DstLow ? AMDGPU::SDWA::SdwaSel::WORD_0
855 : AMDGPU::SDWA::SdwaSel::WORD_1)
856 .addImm(AMDGPU::SDWA::DstUnused::UNUSED_PRESERVE)
857 .addImm(SrcLow ? AMDGPU::SDWA::SdwaSel::WORD_0
858 : AMDGPU::SDWA::SdwaSel::WORD_1)
859 .addReg(NewDestReg, RegState::Implicit | RegState::Undef);
860 // First implicit operand is $exec.
861 MIB->tieOperands(0, MIB->getNumOperands() - 1);
862 return;
863 }
864
865 const TargetRegisterClass *SrcRC = RI.getPhysRegClass(SrcReg);
866 if (RC == RI.getVGPR64Class() && (SrcRC == RC || RI.isSGPRClass(SrcRC))) {
14
Assuming the condition is false
867 if (ST.hasPackedFP32Ops()) {
868 BuildMI(MBB, MI, DL, get(AMDGPU::V_PK_MOV_B32), DestReg)
869 .addImm(SISrcMods::OP_SEL_1)
870 .addReg(SrcReg)
871 .addImm(SISrcMods::OP_SEL_0 | SISrcMods::OP_SEL_1)
872 .addReg(SrcReg)
873 .addImm(0) // op_sel_lo
874 .addImm(0) // op_sel_hi
875 .addImm(0) // neg_lo
876 .addImm(0) // neg_hi
877 .addImm(0) // clamp
878 .addReg(SrcReg, getKillRegState(KillSrc) | RegState::Implicit);
879 return;
880 }
881 }
882
883 const bool Forward = RI.getHWRegIndex(DestReg) <= RI.getHWRegIndex(SrcReg);
884 if (RI.isSGPRClass(RC)) {
15
Taking true branch
885 if (!RI.isSGPRClass(SrcRC)) {
16
Taking false branch
886 reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
887 return;
888 }
889 expandSGPRCopy(*this, MBB, MI, DL, DestReg, SrcReg, KillSrc, RC, Forward);
17
Calling 'expandSGPRCopy'
890 return;
891 }
892
893 unsigned EltSize = 4;
894 unsigned Opcode = AMDGPU::V_MOV_B32_e32;
895 if (RI.hasAGPRs(RC)) {
896 Opcode = (RI.hasVGPRs(SrcRC)) ?
897 AMDGPU::V_ACCVGPR_WRITE_B32_e64 : AMDGPU::INSTRUCTION_LIST_END;
898 } else if (RI.hasVGPRs(RC) && RI.hasAGPRs(SrcRC)) {
899 Opcode = AMDGPU::V_ACCVGPR_READ_B32_e64;
900 } else if ((Size % 64 == 0) && RI.hasVGPRs(RC) &&
901 (RI.isProperlyAlignedRC(*RC) &&
902 (SrcRC == RC || RI.isSGPRClass(SrcRC)))) {
903 // TODO: In 96-bit case, could do a 64-bit mov and then a 32-bit mov.
904 if (ST.hasPackedFP32Ops()) {
905 Opcode = AMDGPU::V_PK_MOV_B32;
906 EltSize = 8;
907 }
908 }
909
910 // For the cases where we need an intermediate instruction/temporary register
911 // (destination is an AGPR), we need a scavenger.
912 //
913 // FIXME: The pass should maintain this for us so we don't have to re-scan the
914 // whole block for every handled copy.
915 std::unique_ptr<RegScavenger> RS;
916 if (Opcode == AMDGPU::INSTRUCTION_LIST_END)
917 RS.reset(new RegScavenger());
918
919 ArrayRef<int16_t> SubIndices = RI.getRegSplitParts(RC, EltSize);
920
921 // If there is an overlap, we can't kill the super-register on the last
922 // instruction, since it will also kill the components made live by this def.
923 const bool CanKillSuperReg = KillSrc && !RI.regsOverlap(SrcReg, DestReg);
924
925 for (unsigned Idx = 0; Idx < SubIndices.size(); ++Idx) {
926 unsigned SubIdx;
927 if (Forward)
928 SubIdx = SubIndices[Idx];
929 else
930 SubIdx = SubIndices[SubIndices.size() - Idx - 1];
931
932 bool UseKill = CanKillSuperReg && Idx == SubIndices.size() - 1;
933
934 if (Opcode == AMDGPU::INSTRUCTION_LIST_END) {
935 Register ImpDefSuper = Idx == 0 ? Register(DestReg) : Register();
936 Register ImpUseSuper = SrcReg;
937 indirectCopyToAGPR(*this, MBB, MI, DL, RI.getSubReg(DestReg, SubIdx),
938 RI.getSubReg(SrcReg, SubIdx), UseKill, *RS,
939 ImpDefSuper, ImpUseSuper);
940 } else if (Opcode == AMDGPU::V_PK_MOV_B32) {
941 Register DstSubReg = RI.getSubReg(DestReg, SubIdx);
942 Register SrcSubReg = RI.getSubReg(SrcReg, SubIdx);
943 MachineInstrBuilder MIB =
944 BuildMI(MBB, MI, DL, get(AMDGPU::V_PK_MOV_B32), DstSubReg)
945 .addImm(SISrcMods::OP_SEL_1)
946 .addReg(SrcSubReg)
947 .addImm(SISrcMods::OP_SEL_0 | SISrcMods::OP_SEL_1)
948 .addReg(SrcSubReg)
949 .addImm(0) // op_sel_lo
950 .addImm(0) // op_sel_hi
951 .addImm(0) // neg_lo
952 .addImm(0) // neg_hi
953 .addImm(0) // clamp
954 .addReg(SrcReg, getKillRegState(UseKill) | RegState::Implicit);
955 if (Idx == 0)
956 MIB.addReg(DestReg, RegState::Define | RegState::Implicit);
957 } else {
958 MachineInstrBuilder Builder =
959 BuildMI(MBB, MI, DL, get(Opcode), RI.getSubReg(DestReg, SubIdx))
960 .addReg(RI.getSubReg(SrcReg, SubIdx));
961 if (Idx == 0)
962 Builder.addReg(DestReg, RegState::Define | RegState::Implicit);
963
964 Builder.addReg(SrcReg, getKillRegState(UseKill) | RegState::Implicit);
965 }
966 }
967}
968
969int SIInstrInfo::commuteOpcode(unsigned Opcode) const {
970 int NewOpc;
971
972 // Try to map original to commuted opcode
973 NewOpc = AMDGPU::getCommuteRev(Opcode);
974 if (NewOpc != -1)
975 // Check if the commuted (REV) opcode exists on the target.
976 return pseudoToMCOpcode(NewOpc) != -1 ? NewOpc : -1;
977
978 // Try to map commuted to original opcode
979 NewOpc = AMDGPU::getCommuteOrig(Opcode);
980 if (NewOpc != -1)
981 // Check if the original (non-REV) opcode exists on the target.
982 return pseudoToMCOpcode(NewOpc) != -1 ? NewOpc : -1;
983
984 return Opcode;
985}
986
987void SIInstrInfo::materializeImmediate(MachineBasicBlock &MBB,
988 MachineBasicBlock::iterator MI,
989 const DebugLoc &DL, unsigned DestReg,
990 int64_t Value) const {
991 MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
992 const TargetRegisterClass *RegClass = MRI.getRegClass(DestReg);
993 if (RegClass == &AMDGPU::SReg_32RegClass ||
994 RegClass == &AMDGPU::SGPR_32RegClass ||
995 RegClass == &AMDGPU::SReg_32_XM0RegClass ||
996 RegClass == &AMDGPU::SReg_32_XM0_XEXECRegClass) {
997 BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DestReg)
998 .addImm(Value);
999 return;
1000 }
1001
1002 if (RegClass == &AMDGPU::SReg_64RegClass ||
1003 RegClass == &AMDGPU::SGPR_64RegClass ||
1004 RegClass == &AMDGPU::SReg_64_XEXECRegClass) {
1005 BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), DestReg)
1006 .addImm(Value);
1007 return;
1008 }
1009
1010 if (RegClass == &AMDGPU::VGPR_32RegClass) {
1011 BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DestReg)
1012 .addImm(Value);
1013 return;
1014 }
1015 if (RegClass->hasSuperClassEq(&AMDGPU::VReg_64RegClass)) {
1016 BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B64_PSEUDO), DestReg)
1017 .addImm(Value);
1018 return;
1019 }
1020
1021 unsigned EltSize = 4;
1022 unsigned Opcode = AMDGPU::V_MOV_B32_e32;
1023 if (RI.isSGPRClass(RegClass)) {
1024 if (RI.getRegSizeInBits(*RegClass) > 32) {
1025 Opcode = AMDGPU::S_MOV_B64;
1026 EltSize = 8;
1027 } else {
1028 Opcode = AMDGPU::S_MOV_B32;
1029 EltSize = 4;
1030 }
1031 }
1032
1033 ArrayRef<int16_t> SubIndices = RI.getRegSplitParts(RegClass, EltSize);
1034 for (unsigned Idx = 0; Idx < SubIndices.size(); ++Idx) {
1035 int64_t IdxValue = Idx == 0 ? Value : 0;
1036
1037 MachineInstrBuilder Builder = BuildMI(MBB, MI, DL,
1038 get(Opcode), RI.getSubReg(DestReg, SubIndices[Idx]));
1039 Builder.addImm(IdxValue);
1040 }
1041}
1042
1043const TargetRegisterClass *
1044SIInstrInfo::getPreferredSelectRegClass(unsigned Size) const {
1045 return &AMDGPU::VGPR_32RegClass;
1046}
1047
1048void SIInstrInfo::insertVectorSelect(MachineBasicBlock &MBB,
1049 MachineBasicBlock::iterator I,
1050 const DebugLoc &DL, Register DstReg,
1051 ArrayRef<MachineOperand> Cond,
1052 Register TrueReg,
1053 Register FalseReg) const {
1054 MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
1055 const TargetRegisterClass *BoolXExecRC =
1056 RI.getRegClass(AMDGPU::SReg_1_XEXECRegClassID);
1057 assert(MRI.getRegClass(DstReg) == &AMDGPU::VGPR_32RegClass &&((void)0)
1058 "Not a VGPR32 reg")((void)0);
1059
1060 if (Cond.size() == 1) {
1061 Register SReg = MRI.createVirtualRegister(BoolXExecRC);
1062 BuildMI(MBB, I, DL, get(AMDGPU::COPY), SReg)
1063 .add(Cond[0]);
1064 BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
1065 .addImm(0)
1066 .addReg(FalseReg)
1067 .addImm(0)
1068 .addReg(TrueReg)
1069 .addReg(SReg);
1070 } else if (Cond.size() == 2) {
1071 assert(Cond[0].isImm() && "Cond[0] is not an immediate")((void)0);
1072 switch (Cond[0].getImm()) {
1073 case SIInstrInfo::SCC_TRUE: {
1074 Register SReg = MRI.createVirtualRegister(BoolXExecRC);
1075 BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_CSELECT_B32
1076 : AMDGPU::S_CSELECT_B64), SReg)
1077 .addImm(1)
1078 .addImm(0);
1079 BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
1080 .addImm(0)
1081 .addReg(FalseReg)
1082 .addImm(0)
1083 .addReg(TrueReg)
1084 .addReg(SReg);
1085 break;
1086 }
1087 case SIInstrInfo::SCC_FALSE: {
1088 Register SReg = MRI.createVirtualRegister(BoolXExecRC);
1089 BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_CSELECT_B32
1090 : AMDGPU::S_CSELECT_B64), SReg)
1091 .addImm(0)
1092 .addImm(1);
1093 BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
1094 .addImm(0)
1095 .addReg(FalseReg)
1096 .addImm(0)
1097 .addReg(TrueReg)
1098 .addReg(SReg);
1099 break;
1100 }
1101 case SIInstrInfo::VCCNZ: {
1102 MachineOperand RegOp = Cond[1];
1103 RegOp.setImplicit(false);
1104 Register SReg = MRI.createVirtualRegister(BoolXExecRC);
1105 BuildMI(MBB, I, DL, get(AMDGPU::COPY), SReg)
1106 .add(RegOp);
1107 BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
1108 .addImm(0)
1109 .addReg(FalseReg)
1110 .addImm(0)
1111 .addReg(TrueReg)
1112 .addReg(SReg);
1113 break;
1114 }
1115 case SIInstrInfo::VCCZ: {
1116 MachineOperand RegOp = Cond[1];
1117 RegOp.setImplicit(false);
1118 Register SReg = MRI.createVirtualRegister(BoolXExecRC);
1119 BuildMI(MBB, I, DL, get(AMDGPU::COPY), SReg)
1120 .add(RegOp);
1121 BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
1122 .addImm(0)
1123 .addReg(TrueReg)
1124 .addImm(0)
1125 .addReg(FalseReg)
1126 .addReg(SReg);
1127 break;
1128 }
1129 case SIInstrInfo::EXECNZ: {
1130 Register SReg = MRI.createVirtualRegister(BoolXExecRC);
1131 Register SReg2 = MRI.createVirtualRegister(RI.getBoolRC());
1132 BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_OR_SAVEEXEC_B32
1133 : AMDGPU::S_OR_SAVEEXEC_B64), SReg2)
1134 .addImm(0);
1135 BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_CSELECT_B32
1136 : AMDGPU::S_CSELECT_B64), SReg)
1137 .addImm(1)
1138 .addImm(0);
1139 BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
1140 .addImm(0)
1141 .addReg(FalseReg)
1142 .addImm(0)
1143 .addReg(TrueReg)
1144 .addReg(SReg);
1145 break;
1146 }
1147 case SIInstrInfo::EXECZ: {
1148 Register SReg = MRI.createVirtualRegister(BoolXExecRC);
1149 Register SReg2 = MRI.createVirtualRegister(RI.getBoolRC());
1150 BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_OR_SAVEEXEC_B32
1151 : AMDGPU::S_OR_SAVEEXEC_B64), SReg2)
1152 .addImm(0);
1153 BuildMI(MBB, I, DL, get(ST.isWave32() ? AMDGPU::S_CSELECT_B32
1154 : AMDGPU::S_CSELECT_B64), SReg)
1155 .addImm(0)
1156 .addImm(1);
1157 BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstReg)
1158 .addImm(0)
1159 .addReg(FalseReg)
1160 .addImm(0)
1161 .addReg(TrueReg)
1162 .addReg(SReg);
1163 llvm_unreachable("Unhandled branch predicate EXECZ")__builtin_unreachable();
1164 break;
1165 }
1166 default:
1167 llvm_unreachable("invalid branch predicate")__builtin_unreachable();
1168 }
1169 } else {
1170 llvm_unreachable("Can only handle Cond size 1 or 2")__builtin_unreachable();
1171 }
1172}
1173
1174Register SIInstrInfo::insertEQ(MachineBasicBlock *MBB,
1175 MachineBasicBlock::iterator I,
1176 const DebugLoc &DL,
1177 Register SrcReg, int Value) const {
1178 MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
1179 Register Reg = MRI.createVirtualRegister(RI.getBoolRC());
1180 BuildMI(*MBB, I, DL, get(AMDGPU::V_CMP_EQ_I32_e64), Reg)
1181 .addImm(Value)
1182 .addReg(SrcReg);
1183
1184 return Reg;
1185}
1186
1187Register SIInstrInfo::insertNE(MachineBasicBlock *MBB,
1188 MachineBasicBlock::iterator I,
1189 const DebugLoc &DL,
1190 Register SrcReg, int Value) const {
1191 MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
1192 Register Reg = MRI.createVirtualRegister(RI.getBoolRC());
1193 BuildMI(*MBB, I, DL, get(AMDGPU::V_CMP_NE_I32_e64), Reg)
1194 .addImm(Value)
1195 .addReg(SrcReg);
1196
1197 return Reg;
1198}
1199
1200unsigned SIInstrInfo::getMovOpcode(const TargetRegisterClass *DstRC) const {
1201
1202 if (RI.hasAGPRs(DstRC))
1203 return AMDGPU::COPY;
1204 if (RI.getRegSizeInBits(*DstRC) == 32) {
1205 return RI.isSGPRClass(DstRC) ? AMDGPU::S_MOV_B32 : AMDGPU::V_MOV_B32_e32;
1206 } else if (RI.getRegSizeInBits(*DstRC) == 64 && RI.isSGPRClass(DstRC)) {
1207 return AMDGPU::S_MOV_B64;
1208 } else if (RI.getRegSizeInBits(*DstRC) == 64 && !RI.isSGPRClass(DstRC)) {
1209 return AMDGPU::V_MOV_B64_PSEUDO;
1210 }
1211 return AMDGPU::COPY;
1212}
1213
1214const MCInstrDesc &
1215SIInstrInfo::getIndirectGPRIDXPseudo(unsigned VecSize,
1216 bool IsIndirectSrc) const {
1217 if (IsIndirectSrc) {
1218 if (VecSize <= 32) // 4 bytes
1219 return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V1);
1220 if (VecSize <= 64) // 8 bytes
1221 return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V2);
1222 if (VecSize <= 96) // 12 bytes
1223 return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V3);
1224 if (VecSize <= 128) // 16 bytes
1225 return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V4);
1226 if (VecSize <= 160) // 20 bytes
1227 return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V5);
1228 if (VecSize <= 256) // 32 bytes
1229 return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V8);
1230 if (VecSize <= 512) // 64 bytes
1231 return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V16);
1232 if (VecSize <= 1024) // 128 bytes
1233 return get(AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V32);
1234
1235 llvm_unreachable("unsupported size for IndirectRegReadGPRIDX pseudos")__builtin_unreachable();
1236 }
1237
1238 if (VecSize <= 32) // 4 bytes
1239 return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V1);
1240 if (VecSize <= 64) // 8 bytes
1241 return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V2);
1242 if (VecSize <= 96) // 12 bytes
1243 return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V3);
1244 if (VecSize <= 128) // 16 bytes
1245 return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V4);
1246 if (VecSize <= 160) // 20 bytes
1247 return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V5);
1248 if (VecSize <= 256) // 32 bytes
1249 return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V8);
1250 if (VecSize <= 512) // 64 bytes
1251 return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V16);
1252 if (VecSize <= 1024) // 128 bytes
1253 return get(AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V32);
1254
1255 llvm_unreachable("unsupported size for IndirectRegWriteGPRIDX pseudos")__builtin_unreachable();
1256}
1257
1258static unsigned getIndirectVGPRWriteMovRelPseudoOpc(unsigned VecSize) {
1259 if (VecSize <= 32) // 4 bytes
1260 return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V1;
1261 if (VecSize <= 64) // 8 bytes
1262 return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V2;
1263 if (VecSize <= 96) // 12 bytes
1264 return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V3;
1265 if (VecSize <= 128) // 16 bytes
1266 return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V4;
1267 if (VecSize <= 160) // 20 bytes
1268 return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V5;
1269 if (VecSize <= 256) // 32 bytes
1270 return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V8;
1271 if (VecSize <= 512) // 64 bytes
1272 return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V16;
1273 if (VecSize <= 1024) // 128 bytes
1274 return AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V32;
1275
1276 llvm_unreachable("unsupported size for IndirectRegWrite pseudos")__builtin_unreachable();
1277}
1278
1279static unsigned getIndirectSGPRWriteMovRelPseudo32(unsigned VecSize) {
1280 if (VecSize <= 32) // 4 bytes
1281 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V1;
1282 if (VecSize <= 64) // 8 bytes
1283 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V2;
1284 if (VecSize <= 96) // 12 bytes
1285 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V3;
1286 if (VecSize <= 128) // 16 bytes
1287 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V4;
1288 if (VecSize <= 160) // 20 bytes
1289 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V5;
1290 if (VecSize <= 256) // 32 bytes
1291 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V8;
1292 if (VecSize <= 512) // 64 bytes
1293 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V16;
1294 if (VecSize <= 1024) // 128 bytes
1295 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V32;
1296
1297 llvm_unreachable("unsupported size for IndirectRegWrite pseudos")__builtin_unreachable();
1298}
1299
1300static unsigned getIndirectSGPRWriteMovRelPseudo64(unsigned VecSize) {
1301 if (VecSize <= 64) // 8 bytes
1302 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V1;
1303 if (VecSize <= 128) // 16 bytes
1304 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V2;
1305 if (VecSize <= 256) // 32 bytes
1306 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V4;
1307 if (VecSize <= 512) // 64 bytes
1308 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V8;
1309 if (VecSize <= 1024) // 128 bytes
1310 return AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V16;
1311
1312 llvm_unreachable("unsupported size for IndirectRegWrite pseudos")__builtin_unreachable();
1313}
1314
1315const MCInstrDesc &
1316SIInstrInfo::getIndirectRegWriteMovRelPseudo(unsigned VecSize, unsigned EltSize,
1317 bool IsSGPR) const {
1318 if (IsSGPR) {
1319 switch (EltSize) {
1320 case 32:
1321 return get(getIndirectSGPRWriteMovRelPseudo32(VecSize));
1322 case 64:
1323 return get(getIndirectSGPRWriteMovRelPseudo64(VecSize));
1324 default:
1325 llvm_unreachable("invalid reg indexing elt size")__builtin_unreachable();
1326 }
1327 }
1328
1329 assert(EltSize == 32 && "invalid reg indexing elt size")((void)0);
1330 return get(getIndirectVGPRWriteMovRelPseudoOpc(VecSize));
1331}
1332
1333static unsigned getSGPRSpillSaveOpcode(unsigned Size) {
1334 switch (Size) {
1335 case 4:
1336 return AMDGPU::SI_SPILL_S32_SAVE;
1337 case 8:
1338 return AMDGPU::SI_SPILL_S64_SAVE;
1339 case 12:
1340 return AMDGPU::SI_SPILL_S96_SAVE;
1341 case 16:
1342 return AMDGPU::SI_SPILL_S128_SAVE;
1343 case 20:
1344 return AMDGPU::SI_SPILL_S160_SAVE;
1345 case 24:
1346 return AMDGPU::SI_SPILL_S192_SAVE;
1347 case 28:
1348 return AMDGPU::SI_SPILL_S224_SAVE;
1349 case 32:
1350 return AMDGPU::SI_SPILL_S256_SAVE;
1351 case 64:
1352 return AMDGPU::SI_SPILL_S512_SAVE;
1353 case 128:
1354 return AMDGPU::SI_SPILL_S1024_SAVE;
1355 default:
1356 llvm_unreachable("unknown register size")__builtin_unreachable();
1357 }
1358}
1359
1360static unsigned getVGPRSpillSaveOpcode(unsigned Size) {
1361 switch (Size) {
1362 case 4:
1363 return AMDGPU::SI_SPILL_V32_SAVE;
1364 case 8:
1365 return AMDGPU::SI_SPILL_V64_SAVE;
1366 case 12:
1367 return AMDGPU::SI_SPILL_V96_SAVE;
1368 case 16:
1369 return AMDGPU::SI_SPILL_V128_SAVE;
1370 case 20:
1371 return AMDGPU::SI_SPILL_V160_SAVE;
1372 case 24:
1373 return AMDGPU::SI_SPILL_V192_SAVE;
1374 case 28:
1375 return AMDGPU::SI_SPILL_V224_SAVE;
1376 case 32:
1377 return AMDGPU::SI_SPILL_V256_SAVE;
1378 case 64:
1379 return AMDGPU::SI_SPILL_V512_SAVE;
1380 case 128:
1381 return AMDGPU::SI_SPILL_V1024_SAVE;
1382 default:
1383 llvm_unreachable("unknown register size")__builtin_unreachable();
1384 }
1385}
1386
1387static unsigned getAGPRSpillSaveOpcode(unsigned Size) {
1388 switch (Size) {
1389 case 4:
1390 return AMDGPU::SI_SPILL_A32_SAVE;
1391 case 8:
1392 return AMDGPU::SI_SPILL_A64_SAVE;
1393 case 12:
1394 return AMDGPU::SI_SPILL_A96_SAVE;
1395 case 16:
1396 return AMDGPU::SI_SPILL_A128_SAVE;
1397 case 20:
1398 return AMDGPU::SI_SPILL_A160_SAVE;
1399 case 24:
1400 return AMDGPU::SI_SPILL_A192_SAVE;
1401 case 28:
1402 return AMDGPU::SI_SPILL_A224_SAVE;
1403 case 32:
1404 return AMDGPU::SI_SPILL_A256_SAVE;
1405 case 64:
1406 return AMDGPU::SI_SPILL_A512_SAVE;
1407 case 128:
1408 return AMDGPU::SI_SPILL_A1024_SAVE;
1409 default:
1410 llvm_unreachable("unknown register size")__builtin_unreachable();
1411 }
1412}
1413
1414void SIInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
1415 MachineBasicBlock::iterator MI,
1416 Register SrcReg, bool isKill,
1417 int FrameIndex,
1418 const TargetRegisterClass *RC,
1419 const TargetRegisterInfo *TRI) const {
1420 MachineFunction *MF = MBB.getParent();
1421 SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
1422 MachineFrameInfo &FrameInfo = MF->getFrameInfo();
1423 const DebugLoc &DL = MBB.findDebugLoc(MI);
1424
1425 MachinePointerInfo PtrInfo
1426 = MachinePointerInfo::getFixedStack(*MF, FrameIndex);
1427 MachineMemOperand *MMO = MF->getMachineMemOperand(
1428 PtrInfo, MachineMemOperand::MOStore, FrameInfo.getObjectSize(FrameIndex),
1429 FrameInfo.getObjectAlign(FrameIndex));
1430 unsigned SpillSize = TRI->getSpillSize(*RC);
1431
1432 if (RI.isSGPRClass(RC)) {
1433 MFI->setHasSpilledSGPRs();
1434 assert(SrcReg != AMDGPU::M0 && "m0 should not be spilled")((void)0);
1435 assert(SrcReg != AMDGPU::EXEC_LO && SrcReg != AMDGPU::EXEC_HI &&((void)0)
1436 SrcReg != AMDGPU::EXEC && "exec should not be spilled")((void)0);
1437
1438 // We are only allowed to create one new instruction when spilling
1439 // registers, so we need to use pseudo instruction for spilling SGPRs.
1440 const MCInstrDesc &OpDesc = get(getSGPRSpillSaveOpcode(SpillSize));
1441
1442 // The SGPR spill/restore instructions only work on number sgprs, so we need
1443 // to make sure we are using the correct register class.
1444 if (SrcReg.isVirtual() && SpillSize == 4) {
1445 MachineRegisterInfo &MRI = MF->getRegInfo();
1446 MRI.constrainRegClass(SrcReg, &AMDGPU::SReg_32_XM0_XEXECRegClass);
1447 }
1448
1449 BuildMI(MBB, MI, DL, OpDesc)
1450 .addReg(SrcReg, getKillRegState(isKill)) // data
1451 .addFrameIndex(FrameIndex) // addr
1452 .addMemOperand(MMO)
1453 .addReg(MFI->getStackPtrOffsetReg(), RegState::Implicit);
1454
1455 if (RI.spillSGPRToVGPR())
1456 FrameInfo.setStackID(FrameIndex, TargetStackID::SGPRSpill);
1457 return;
1458 }
1459
1460 unsigned Opcode = RI.hasAGPRs(RC) ? getAGPRSpillSaveOpcode(SpillSize)
1461 : getVGPRSpillSaveOpcode(SpillSize);
1462 MFI->setHasSpilledVGPRs();
1463
1464 BuildMI(MBB, MI, DL, get(Opcode))
1465 .addReg(SrcReg, getKillRegState(isKill)) // data
1466 .addFrameIndex(FrameIndex) // addr
1467 .addReg(MFI->getStackPtrOffsetReg()) // scratch_offset
1468 .addImm(0) // offset
1469 .addMemOperand(MMO);
1470}
1471
1472static unsigned getSGPRSpillRestoreOpcode(unsigned Size) {
1473 switch (Size) {
1474 case 4:
1475 return AMDGPU::SI_SPILL_S32_RESTORE;
1476 case 8:
1477 return AMDGPU::SI_SPILL_S64_RESTORE;
1478 case 12:
1479 return AMDGPU::SI_SPILL_S96_RESTORE;
1480 case 16:
1481 return AMDGPU::SI_SPILL_S128_RESTORE;
1482 case 20:
1483 return AMDGPU::SI_SPILL_S160_RESTORE;
1484 case 24:
1485 return AMDGPU::SI_SPILL_S192_RESTORE;
1486 case 28:
1487 return AMDGPU::SI_SPILL_S224_RESTORE;
1488 case 32:
1489 return AMDGPU::SI_SPILL_S256_RESTORE;
1490 case 64:
1491 return AMDGPU::SI_SPILL_S512_RESTORE;
1492 case 128:
1493 return AMDGPU::SI_SPILL_S1024_RESTORE;
1494 default:
1495 llvm_unreachable("unknown register size")__builtin_unreachable();
1496 }
1497}
1498
1499static unsigned getVGPRSpillRestoreOpcode(unsigned Size) {
1500 switch (Size) {
1501 case 4:
1502 return AMDGPU::SI_SPILL_V32_RESTORE;
1503 case 8:
1504 return AMDGPU::SI_SPILL_V64_RESTORE;
1505 case 12:
1506 return AMDGPU::SI_SPILL_V96_RESTORE;
1507 case 16:
1508 return AMDGPU::SI_SPILL_V128_RESTORE;
1509 case 20:
1510 return AMDGPU::SI_SPILL_V160_RESTORE;
1511 case 24:
1512 return AMDGPU::SI_SPILL_V192_RESTORE;
1513 case 28:
1514 return AMDGPU::SI_SPILL_V224_RESTORE;
1515 case 32:
1516 return AMDGPU::SI_SPILL_V256_RESTORE;
1517 case 64:
1518 return AMDGPU::SI_SPILL_V512_RESTORE;
1519 case 128:
1520 return AMDGPU::SI_SPILL_V1024_RESTORE;
1521 default:
1522 llvm_unreachable("unknown register size")__builtin_unreachable();
1523 }
1524}
1525
1526static unsigned getAGPRSpillRestoreOpcode(unsigned Size) {
1527 switch (Size) {
1528 case 4:
1529 return AMDGPU::SI_SPILL_A32_RESTORE;
1530 case 8:
1531 return AMDGPU::SI_SPILL_A64_RESTORE;
1532 case 12:
1533 return AMDGPU::SI_SPILL_A96_RESTORE;
1534 case 16:
1535 return AMDGPU::SI_SPILL_A128_RESTORE;
1536 case 20:
1537 return AMDGPU::SI_SPILL_A160_RESTORE;
1538 case 24:
1539 return AMDGPU::SI_SPILL_A192_RESTORE;
1540 case 28:
1541 return AMDGPU::SI_SPILL_A224_RESTORE;
1542 case 32:
1543 return AMDGPU::SI_SPILL_A256_RESTORE;
1544 case 64:
1545 return AMDGPU::SI_SPILL_A512_RESTORE;
1546 case 128:
1547 return AMDGPU::SI_SPILL_A1024_RESTORE;
1548 default:
1549 llvm_unreachable("unknown register size")__builtin_unreachable();
1550 }
1551}
1552
1553void SIInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
1554 MachineBasicBlock::iterator MI,
1555 Register DestReg, int FrameIndex,
1556 const TargetRegisterClass *RC,
1557 const TargetRegisterInfo *TRI) const {
1558 MachineFunction *MF = MBB.getParent();
1559 SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
1560 MachineFrameInfo &FrameInfo = MF->getFrameInfo();
1561 const DebugLoc &DL = MBB.findDebugLoc(MI);
1562 unsigned SpillSize = TRI->getSpillSize(*RC);
1563
1564 MachinePointerInfo PtrInfo
1565 = MachinePointerInfo::getFixedStack(*MF, FrameIndex);
1566
1567 MachineMemOperand *MMO = MF->getMachineMemOperand(
1568 PtrInfo, MachineMemOperand::MOLoad, FrameInfo.getObjectSize(FrameIndex),
1569 FrameInfo.getObjectAlign(FrameIndex));
1570
1571 if (RI.isSGPRClass(RC)) {
1572 MFI->setHasSpilledSGPRs();
1573 assert(DestReg != AMDGPU::M0 && "m0 should not be reloaded into")((void)0);
1574 assert(DestReg != AMDGPU::EXEC_LO && DestReg != AMDGPU::EXEC_HI &&((void)0)
1575 DestReg != AMDGPU::EXEC && "exec should not be spilled")((void)0);
1576
1577 // FIXME: Maybe this should not include a memoperand because it will be
1578 // lowered to non-memory instructions.
1579 const MCInstrDesc &OpDesc = get(getSGPRSpillRestoreOpcode(SpillSize));
1580 if (DestReg.isVirtual() && SpillSize == 4) {
1581 MachineRegisterInfo &MRI = MF->getRegInfo();
1582 MRI.constrainRegClass(DestReg, &AMDGPU::SReg_32_XM0_XEXECRegClass);
1583 }
1584
1585 if (RI.spillSGPRToVGPR())
1586 FrameInfo.setStackID(FrameIndex, TargetStackID::SGPRSpill);
1587 BuildMI(MBB, MI, DL, OpDesc, DestReg)
1588 .addFrameIndex(FrameIndex) // addr
1589 .addMemOperand(MMO)
1590 .addReg(MFI->getStackPtrOffsetReg(), RegState::Implicit);
1591
1592 return;
1593 }
1594
1595 unsigned Opcode = RI.hasAGPRs(RC) ? getAGPRSpillRestoreOpcode(SpillSize)
1596 : getVGPRSpillRestoreOpcode(SpillSize);
1597 BuildMI(MBB, MI, DL, get(Opcode), DestReg)
1598 .addFrameIndex(FrameIndex) // vaddr
1599 .addReg(MFI->getStackPtrOffsetReg()) // scratch_offset
1600 .addImm(0) // offset
1601 .addMemOperand(MMO);
1602}
1603
1604void SIInstrInfo::insertNoop(MachineBasicBlock &MBB,
1605 MachineBasicBlock::iterator MI) const {
1606 insertNoops(MBB, MI, 1);
1607}
1608
1609void SIInstrInfo::insertNoops(MachineBasicBlock &MBB,
1610 MachineBasicBlock::iterator MI,
1611 unsigned Quantity) const {
1612 DebugLoc DL = MBB.findDebugLoc(MI);
1613 while (Quantity > 0) {
1614 unsigned Arg = std::min(Quantity, 8u);
1615 Quantity -= Arg;
1616 BuildMI(MBB, MI, DL, get(AMDGPU::S_NOP)).addImm(Arg - 1);
1617 }
1618}
1619
1620void SIInstrInfo::insertReturn(MachineBasicBlock &MBB) const {
1621 auto MF = MBB.getParent();
1622 SIMachineFunctionInfo *Info = MF->getInfo<SIMachineFunctionInfo>();
1623
1624 assert(Info->isEntryFunction())((void)0);
1625
1626 if (MBB.succ_empty()) {
1627 bool HasNoTerminator = MBB.getFirstTerminator() == MBB.end();
1628 if (HasNoTerminator) {
1629 if (Info->returnsVoid()) {
1630 BuildMI(MBB, MBB.end(), DebugLoc(), get(AMDGPU::S_ENDPGM)).addImm(0);
1631 } else {
1632 BuildMI(MBB, MBB.end(), DebugLoc(), get(AMDGPU::SI_RETURN_TO_EPILOG));
1633 }
1634 }
1635 }
1636}
1637
1638unsigned SIInstrInfo::getNumWaitStates(const MachineInstr &MI) {
1639 switch (MI.getOpcode()) {
1640 default: return 1; // FIXME: Do wait states equal cycles?
1641
1642 case AMDGPU::S_NOP:
1643 return MI.getOperand(0).getImm() + 1;
1644 }
1645}
1646
1647bool SIInstrInfo::expandPostRAPseudo(MachineInstr &MI) const {
1648 const SIRegisterInfo *TRI = ST.getRegisterInfo();
1649 MachineBasicBlock &MBB = *MI.getParent();
1650 DebugLoc DL = MBB.findDebugLoc(MI);
1651 switch (MI.getOpcode()) {
1652 default: return TargetInstrInfo::expandPostRAPseudo(MI);
1653 case AMDGPU::S_MOV_B64_term:
1654 // This is only a terminator to get the correct spill code placement during
1655 // register allocation.
1656 MI.setDesc(get(AMDGPU::S_MOV_B64));
1657 break;
1658
1659 case AMDGPU::S_MOV_B32_term:
1660 // This is only a terminator to get the correct spill code placement during
1661 // register allocation.
1662 MI.setDesc(get(AMDGPU::S_MOV_B32));
1663 break;
1664
1665 case AMDGPU::S_XOR_B64_term:
1666 // This is only a terminator to get the correct spill code placement during
1667 // register allocation.
1668 MI.setDesc(get(AMDGPU::S_XOR_B64));
1669 break;
1670
1671 case AMDGPU::S_XOR_B32_term:
1672 // This is only a terminator to get the correct spill code placement during
1673 // register allocation.
1674 MI.setDesc(get(AMDGPU::S_XOR_B32));
1675 break;
1676 case AMDGPU::S_OR_B64_term:
1677 // This is only a terminator to get the correct spill code placement during
1678 // register allocation.
1679 MI.setDesc(get(AMDGPU::S_OR_B64));
1680 break;
1681 case AMDGPU::S_OR_B32_term:
1682 // This is only a terminator to get the correct spill code placement during
1683 // register allocation.
1684 MI.setDesc(get(AMDGPU::S_OR_B32));
1685 break;
1686
1687 case AMDGPU::S_ANDN2_B64_term:
1688 // This is only a terminator to get the correct spill code placement during
1689 // register allocation.
1690 MI.setDesc(get(AMDGPU::S_ANDN2_B64));
1691 break;
1692
1693 case AMDGPU::S_ANDN2_B32_term:
1694 // This is only a terminator to get the correct spill code placement during
1695 // register allocation.
1696 MI.setDesc(get(AMDGPU::S_ANDN2_B32));
1697 break;
1698
1699 case AMDGPU::S_AND_B64_term:
1700 // This is only a terminator to get the correct spill code placement during
1701 // register allocation.
1702 MI.setDesc(get(AMDGPU::S_AND_B64));
1703 break;
1704
1705 case AMDGPU::S_AND_B32_term:
1706 // This is only a terminator to get the correct spill code placement during
1707 // register allocation.
1708 MI.setDesc(get(AMDGPU::S_AND_B32));
1709 break;
1710
1711 case AMDGPU::V_MOV_B64_PSEUDO: {
1712 Register Dst = MI.getOperand(0).getReg();
1713 Register DstLo = RI.getSubReg(Dst, AMDGPU::sub0);
1714 Register DstHi = RI.getSubReg(Dst, AMDGPU::sub1);
1715
1716 const MachineOperand &SrcOp = MI.getOperand(1);
1717 // FIXME: Will this work for 64-bit floating point immediates?
1718 assert(!SrcOp.isFPImm())((void)0);
1719 if (SrcOp.isImm()) {
1720 APInt Imm(64, SrcOp.getImm());
1721 APInt Lo(32, Imm.getLoBits(32).getZExtValue());
1722 APInt Hi(32, Imm.getHiBits(32).getZExtValue());
1723 if (ST.hasPackedFP32Ops() && Lo == Hi && isInlineConstant(Lo)) {
1724 BuildMI(MBB, MI, DL, get(AMDGPU::V_PK_MOV_B32), Dst)
1725 .addImm(SISrcMods::OP_SEL_1)
1726 .addImm(Lo.getSExtValue())
1727 .addImm(SISrcMods::OP_SEL_1)
1728 .addImm(Lo.getSExtValue())
1729 .addImm(0) // op_sel_lo
1730 .addImm(0) // op_sel_hi
1731 .addImm(0) // neg_lo
1732 .addImm(0) // neg_hi
1733 .addImm(0); // clamp
1734 } else {
1735 BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstLo)
1736 .addImm(Lo.getSExtValue())
1737 .addReg(Dst, RegState::Implicit | RegState::Define);
1738 BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstHi)
1739 .addImm(Hi.getSExtValue())
1740 .addReg(Dst, RegState::Implicit | RegState::Define);
1741 }
1742 } else {
1743 assert(SrcOp.isReg())((void)0);
1744 if (ST.hasPackedFP32Ops() &&
1745 !RI.isAGPR(MBB.getParent()->getRegInfo(), SrcOp.getReg())) {
1746 BuildMI(MBB, MI, DL, get(AMDGPU::V_PK_MOV_B32), Dst)
1747 .addImm(SISrcMods::OP_SEL_1) // src0_mod
1748 .addReg(SrcOp.getReg())
1749 .addImm(SISrcMods::OP_SEL_0 | SISrcMods::OP_SEL_1) // src1_mod
1750 .addReg(SrcOp.getReg())
1751 .addImm(0) // op_sel_lo
1752 .addImm(0) // op_sel_hi
1753 .addImm(0) // neg_lo
1754 .addImm(0) // neg_hi
1755 .addImm(0); // clamp
1756 } else {
1757 BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstLo)
1758 .addReg(RI.getSubReg(SrcOp.getReg(), AMDGPU::sub0))
1759 .addReg(Dst, RegState::Implicit | RegState::Define);
1760 BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstHi)
1761 .addReg(RI.getSubReg(SrcOp.getReg(), AMDGPU::sub1))
1762 .addReg(Dst, RegState::Implicit | RegState::Define);
1763 }
1764 }
1765 MI.eraseFromParent();
1766 break;
1767 }
1768 case AMDGPU::V_MOV_B64_DPP_PSEUDO: {
1769 expandMovDPP64(MI);
1770 break;
1771 }
1772 case AMDGPU::S_MOV_B64_IMM_PSEUDO: {
1773 const MachineOperand &SrcOp = MI.getOperand(1);
1774 assert(!SrcOp.isFPImm())((void)0);
1775 APInt Imm(64, SrcOp.getImm());
1776 if (Imm.isIntN(32) || isInlineConstant(Imm)) {
1777 MI.setDesc(get(AMDGPU::S_MOV_B64));
1778 break;
1779 }
1780
1781 Register Dst = MI.getOperand(0).getReg();
1782 Register DstLo = RI.getSubReg(Dst, AMDGPU::sub0);
1783 Register DstHi = RI.getSubReg(Dst, AMDGPU::sub1);
1784
1785 APInt Lo(32, Imm.getLoBits(32).getZExtValue());
1786 APInt Hi(32, Imm.getHiBits(32).getZExtValue());
1787 BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DstLo)
1788 .addImm(Lo.getSExtValue())
1789 .addReg(Dst, RegState::Implicit | RegState::Define);
1790 BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DstHi)
1791 .addImm(Hi.getSExtValue())
1792 .addReg(Dst, RegState::Implicit | RegState::Define);
1793 MI.eraseFromParent();
1794 break;
1795 }
1796 case AMDGPU::V_SET_INACTIVE_B32: {
1797 unsigned NotOpc = ST.isWave32() ? AMDGPU::S_NOT_B32 : AMDGPU::S_NOT_B64;
1798 unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
1799 auto FirstNot = BuildMI(MBB, MI, DL, get(NotOpc), Exec).addReg(Exec);
1800 FirstNot->addRegisterDead(AMDGPU::SCC, TRI); // SCC is overwritten
1801 BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), MI.getOperand(0).getReg())
1802 .add(MI.getOperand(2));
1803 BuildMI(MBB, MI, DL, get(NotOpc), Exec)
1804 .addReg(Exec);
1805 MI.eraseFromParent();
1806 break;
1807 }
1808 case AMDGPU::V_SET_INACTIVE_B64: {
1809 unsigned NotOpc = ST.isWave32() ? AMDGPU::S_NOT_B32 : AMDGPU::S_NOT_B64;
1810 unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
1811 auto FirstNot = BuildMI(MBB, MI, DL, get(NotOpc), Exec).addReg(Exec);
1812 FirstNot->addRegisterDead(AMDGPU::SCC, TRI); // SCC is overwritten
1813 MachineInstr *Copy = BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B64_PSEUDO),
1814 MI.getOperand(0).getReg())
1815 .add(MI.getOperand(2));
1816 expandPostRAPseudo(*Copy);
1817 BuildMI(MBB, MI, DL, get(NotOpc), Exec)
1818 .addReg(Exec);
1819 MI.eraseFromParent();
1820 break;
1821 }
1822 case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V1:
1823 case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V2:
1824 case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V3:
1825 case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V4:
1826 case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V5:
1827 case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V8:
1828 case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V16:
1829 case AMDGPU::V_INDIRECT_REG_WRITE_MOVREL_B32_V32:
1830 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V1:
1831 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V2:
1832 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V3:
1833 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V4:
1834 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V5:
1835 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V8:
1836 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V16:
1837 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B32_V32:
1838 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V1:
1839 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V2:
1840 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V4:
1841 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V8:
1842 case AMDGPU::S_INDIRECT_REG_WRITE_MOVREL_B64_V16: {
1843 const TargetRegisterClass *EltRC = getOpRegClass(MI, 2);
1844
1845 unsigned Opc;
1846 if (RI.hasVGPRs(EltRC)) {
1847 Opc = AMDGPU::V_MOVRELD_B32_e32;
1848 } else {
1849 Opc = RI.getRegSizeInBits(*EltRC) == 64 ? AMDGPU::S_MOVRELD_B64
1850 : AMDGPU::S_MOVRELD_B32;
1851 }
1852
1853 const MCInstrDesc &OpDesc = get(Opc);
1854 Register VecReg = MI.getOperand(0).getReg();
1855 bool IsUndef = MI.getOperand(1).isUndef();
1856 unsigned SubReg = MI.getOperand(3).getImm();
1857 assert(VecReg == MI.getOperand(1).getReg())((void)0);
1858
1859 MachineInstrBuilder MIB =
1860 BuildMI(MBB, MI, DL, OpDesc)
1861 .addReg(RI.getSubReg(VecReg, SubReg), RegState::Undef)
1862 .add(MI.getOperand(2))
1863 .addReg(VecReg, RegState::ImplicitDefine)
1864 .addReg(VecReg, RegState::Implicit | (IsUndef ? RegState::Undef : 0));
1865
1866 const int ImpDefIdx =
1867 OpDesc.getNumOperands() + OpDesc.getNumImplicitUses();
1868 const int ImpUseIdx = ImpDefIdx + 1;
1869 MIB->tieOperands(ImpDefIdx, ImpUseIdx);
1870 MI.eraseFromParent();
1871 break;
1872 }
1873 case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V1:
1874 case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V2:
1875 case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V3:
1876 case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V4:
1877 case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V5:
1878 case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V8:
1879 case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V16:
1880 case AMDGPU::V_INDIRECT_REG_WRITE_GPR_IDX_B32_V32: {
1881 assert(ST.useVGPRIndexMode())((void)0);
1882 Register VecReg = MI.getOperand(0).getReg();
1883 bool IsUndef = MI.getOperand(1).isUndef();
1884 Register Idx = MI.getOperand(3).getReg();
1885 Register SubReg = MI.getOperand(4).getImm();
1886
1887 MachineInstr *SetOn = BuildMI(MBB, MI, DL, get(AMDGPU::S_SET_GPR_IDX_ON))
1888 .addReg(Idx)
1889 .addImm(AMDGPU::VGPRIndexMode::DST_ENABLE);
1890 SetOn->getOperand(3).setIsUndef();
1891
1892 const MCInstrDesc &OpDesc = get(AMDGPU::V_MOV_B32_indirect);
1893 MachineInstrBuilder MIB =
1894 BuildMI(MBB, MI, DL, OpDesc)
1895 .addReg(RI.getSubReg(VecReg, SubReg), RegState::Undef)
1896 .add(MI.getOperand(2))
1897 .addReg(VecReg, RegState::ImplicitDefine)
1898 .addReg(VecReg,
1899 RegState::Implicit | (IsUndef ? RegState::Undef : 0));
1900
1901 const int ImpDefIdx = OpDesc.getNumOperands() + OpDesc.getNumImplicitUses();
1902 const int ImpUseIdx = ImpDefIdx + 1;
1903 MIB->tieOperands(ImpDefIdx, ImpUseIdx);
1904
1905 MachineInstr *SetOff = BuildMI(MBB, MI, DL, get(AMDGPU::S_SET_GPR_IDX_OFF));
1906
1907 finalizeBundle(MBB, SetOn->getIterator(), std::next(SetOff->getIterator()));
1908
1909 MI.eraseFromParent();
1910 break;
1911 }
1912 case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V1:
1913 case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V2:
1914 case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V3:
1915 case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V4:
1916 case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V5:
1917 case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V8:
1918 case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V16:
1919 case AMDGPU::V_INDIRECT_REG_READ_GPR_IDX_B32_V32: {
1920 assert(ST.useVGPRIndexMode())((void)0);
1921 Register Dst = MI.getOperand(0).getReg();
1922 Register VecReg = MI.getOperand(1).getReg();
1923 bool IsUndef = MI.getOperand(1).isUndef();
1924 Register Idx = MI.getOperand(2).getReg();
1925 Register SubReg = MI.getOperand(3).getImm();
1926
1927 MachineInstr *SetOn = BuildMI(MBB, MI, DL, get(AMDGPU::S_SET_GPR_IDX_ON))
1928 .addReg(Idx)
1929 .addImm(AMDGPU::VGPRIndexMode::SRC0_ENABLE);
1930 SetOn->getOperand(3).setIsUndef();
1931
1932 BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32))
1933 .addDef(Dst)
1934 .addReg(RI.getSubReg(VecReg, SubReg), RegState::Undef)
1935 .addReg(VecReg, RegState::Implicit | (IsUndef ? RegState::Undef : 0))
1936 .addReg(AMDGPU::M0, RegState::Implicit);
1937
1938 MachineInstr *SetOff = BuildMI(MBB, MI, DL, get(AMDGPU::S_SET_GPR_IDX_OFF));
1939
1940 finalizeBundle(MBB, SetOn->getIterator(), std::next(SetOff->getIterator()));
1941
1942 MI.eraseFromParent();
1943 break;
1944 }
1945 case AMDGPU::SI_PC_ADD_REL_OFFSET: {
1946 MachineFunction &MF = *MBB.getParent();
1947 Register Reg = MI.getOperand(0).getReg();
1948 Register RegLo = RI.getSubReg(Reg, AMDGPU::sub0);
1949 Register RegHi = RI.getSubReg(Reg, AMDGPU::sub1);
1950
1951 // Create a bundle so these instructions won't be re-ordered by the
1952 // post-RA scheduler.
1953 MIBundleBuilder Bundler(MBB, MI);
1954 Bundler.append(BuildMI(MF, DL, get(AMDGPU::S_GETPC_B64), Reg));
1955
1956 // Add 32-bit offset from this instruction to the start of the
1957 // constant data.
1958 Bundler.append(BuildMI(MF, DL, get(AMDGPU::S_ADD_U32), RegLo)
1959 .addReg(RegLo)
1960 .add(MI.getOperand(1)));
1961
1962 MachineInstrBuilder MIB = BuildMI(MF, DL, get(AMDGPU::S_ADDC_U32), RegHi)
1963 .addReg(RegHi);
1964 MIB.add(MI.getOperand(2));
1965
1966 Bundler.append(MIB);
1967 finalizeBundle(MBB, Bundler.begin());
1968
1969 MI.eraseFromParent();
1970 break;
1971 }
1972 case AMDGPU::ENTER_STRICT_WWM: {
1973 // This only gets its own opcode so that SIPreAllocateWWMRegs can tell when
1974 // Whole Wave Mode is entered.
1975 MI.setDesc(get(ST.isWave32() ? AMDGPU::S_OR_SAVEEXEC_B32
1976 : AMDGPU::S_OR_SAVEEXEC_B64));
1977 break;
1978 }
1979 case AMDGPU::ENTER_STRICT_WQM: {
1980 // This only gets its own opcode so that SIPreAllocateWWMRegs can tell when
1981 // STRICT_WQM is entered.
1982 const unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
1983 const unsigned WQMOp = ST.isWave32() ? AMDGPU::S_WQM_B32 : AMDGPU::S_WQM_B64;
1984 const unsigned MovOp = ST.isWave32() ? AMDGPU::S_MOV_B32 : AMDGPU::S_MOV_B64;
1985 BuildMI(MBB, MI, DL, get(MovOp), MI.getOperand(0).getReg()).addReg(Exec);
1986 BuildMI(MBB, MI, DL, get(WQMOp), Exec).addReg(Exec);
1987
1988 MI.eraseFromParent();
1989 break;
1990 }
1991 case AMDGPU::EXIT_STRICT_WWM:
1992 case AMDGPU::EXIT_STRICT_WQM: {
1993 // This only gets its own opcode so that SIPreAllocateWWMRegs can tell when
1994 // WWM/STICT_WQM is exited.
1995 MI.setDesc(get(ST.isWave32() ? AMDGPU::S_MOV_B32 : AMDGPU::S_MOV_B64));
1996 break;
1997 }
1998 }
1999 return true;
2000}
2001
2002std::pair<MachineInstr*, MachineInstr*>
2003SIInstrInfo::expandMovDPP64(MachineInstr &MI) const {
2004 assert (MI.getOpcode() == AMDGPU::V_MOV_B64_DPP_PSEUDO)((void)0);
2005
2006 MachineBasicBlock &MBB = *MI.getParent();
2007 DebugLoc DL = MBB.findDebugLoc(MI);
2008 MachineFunction *MF = MBB.getParent();
2009 MachineRegisterInfo &MRI = MF->getRegInfo();
2010 Register Dst = MI.getOperand(0).getReg();
2011 unsigned Part = 0;
2012 MachineInstr *Split[2];
2013
2014 for (auto Sub : { AMDGPU::sub0, AMDGPU::sub1 }) {
2015 auto MovDPP = BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_dpp));
2016 if (Dst.isPhysical()) {
2017 MovDPP.addDef(RI.getSubReg(Dst, Sub));
2018 } else {
2019 assert(MRI.isSSA())((void)0);
2020 auto Tmp = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
2021 MovDPP.addDef(Tmp);
2022 }
2023
2024 for (unsigned I = 1; I <= 2; ++I) { // old and src operands.
2025 const MachineOperand &SrcOp = MI.getOperand(I);
2026 assert(!SrcOp.isFPImm())((void)0);
2027 if (SrcOp.isImm()) {
2028 APInt Imm(64, SrcOp.getImm());
2029 Imm.ashrInPlace(Part * 32);
2030 MovDPP.addImm(Imm.getLoBits(32).getZExtValue());
2031 } else {
2032 assert(SrcOp.isReg())((void)0);
2033 Register Src = SrcOp.getReg();
2034 if (Src.isPhysical())
2035 MovDPP.addReg(RI.getSubReg(Src, Sub));
2036 else
2037 MovDPP.addReg(Src, SrcOp.isUndef() ? RegState::Undef : 0, Sub);
2038 }
2039 }
2040
2041 for (unsigned I = 3; I < MI.getNumExplicitOperands(); ++I)
2042 MovDPP.addImm(MI.getOperand(I).getImm());
2043
2044 Split[Part] = MovDPP;
2045 ++Part;
2046 }
2047
2048 if (Dst.isVirtual())
2049 BuildMI(MBB, MI, DL, get(AMDGPU::REG_SEQUENCE), Dst)
2050 .addReg(Split[0]->getOperand(0).getReg())
2051 .addImm(AMDGPU::sub0)
2052 .addReg(Split[1]->getOperand(0).getReg())
2053 .addImm(AMDGPU::sub1);
2054
2055 MI.eraseFromParent();
2056 return std::make_pair(Split[0], Split[1]);
2057}
2058
2059bool SIInstrInfo::swapSourceModifiers(MachineInstr &MI,
2060 MachineOperand &Src0,
2061 unsigned Src0OpName,
2062 MachineOperand &Src1,
2063 unsigned Src1OpName) const {
2064 MachineOperand *Src0Mods = getNamedOperand(MI, Src0OpName);
2065 if (!Src0Mods)
2066 return false;
2067
2068 MachineOperand *Src1Mods = getNamedOperand(MI, Src1OpName);
2069 assert(Src1Mods &&((void)0)
2070 "All commutable instructions have both src0 and src1 modifiers")((void)0);
2071
2072 int Src0ModsVal = Src0Mods->getImm();
2073 int Src1ModsVal = Src1Mods->getImm();
2074
2075 Src1Mods->setImm(Src0ModsVal);
2076 Src0Mods->setImm(Src1ModsVal);
2077 return true;
2078}
2079
2080static MachineInstr *swapRegAndNonRegOperand(MachineInstr &MI,
2081 MachineOperand &RegOp,
2082 MachineOperand &NonRegOp) {
2083 Register Reg = RegOp.getReg();
2084 unsigned SubReg = RegOp.getSubReg();
2085 bool IsKill = RegOp.isKill();
2086 bool IsDead = RegOp.isDead();
2087 bool IsUndef = RegOp.isUndef();
2088 bool IsDebug = RegOp.isDebug();
2089
2090 if (NonRegOp.isImm())
2091 RegOp.ChangeToImmediate(NonRegOp.getImm());
2092 else if (NonRegOp.isFI())
2093 RegOp.ChangeToFrameIndex(NonRegOp.getIndex());
2094 else if (NonRegOp.isGlobal()) {
2095 RegOp.ChangeToGA(NonRegOp.getGlobal(), NonRegOp.getOffset(),
2096 NonRegOp.getTargetFlags());
2097 } else
2098 return nullptr;
2099
2100 // Make sure we don't reinterpret a subreg index in the target flags.
2101 RegOp.setTargetFlags(NonRegOp.getTargetFlags());
2102
2103 NonRegOp.ChangeToRegister(Reg, false, false, IsKill, IsDead, IsUndef, IsDebug);
2104 NonRegOp.setSubReg(SubReg);
2105
2106 return &MI;
2107}
2108
2109MachineInstr *SIInstrInfo::commuteInstructionImpl(MachineInstr &MI, bool NewMI,
2110 unsigned Src0Idx,
2111 unsigned Src1Idx) const {
2112 assert(!NewMI && "this should never be used")((void)0);
2113
2114 unsigned Opc = MI.getOpcode();
2115 int CommutedOpcode = commuteOpcode(Opc);
2116 if (CommutedOpcode == -1)
2117 return nullptr;
2118
2119 assert(AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0) ==((void)0)
2120 static_cast<int>(Src0Idx) &&((void)0)
2121 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1) ==((void)0)
2122 static_cast<int>(Src1Idx) &&((void)0)
2123 "inconsistency with findCommutedOpIndices")((void)0);
2124
2125 MachineOperand &Src0 = MI.getOperand(Src0Idx);
2126 MachineOperand &Src1 = MI.getOperand(Src1Idx);
2127
2128 MachineInstr *CommutedMI = nullptr;
2129 if (Src0.isReg() && Src1.isReg()) {
2130 if (isOperandLegal(MI, Src1Idx, &Src0)) {
2131 // Be sure to copy the source modifiers to the right place.
2132 CommutedMI
2133 = TargetInstrInfo::commuteInstructionImpl(MI, NewMI, Src0Idx, Src1Idx);
2134 }
2135
2136 } else if (Src0.isReg() && !Src1.isReg()) {
2137 // src0 should always be able to support any operand type, so no need to
2138 // check operand legality.
2139 CommutedMI = swapRegAndNonRegOperand(MI, Src0, Src1);
2140 } else if (!Src0.isReg() && Src1.isReg()) {
2141 if (isOperandLegal(MI, Src1Idx, &Src0))
2142 CommutedMI = swapRegAndNonRegOperand(MI, Src1, Src0);
2143 } else {
2144 // FIXME: Found two non registers to commute. This does happen.
2145 return nullptr;
2146 }
2147
2148 if (CommutedMI) {
2149 swapSourceModifiers(MI, Src0, AMDGPU::OpName::src0_modifiers,
2150 Src1, AMDGPU::OpName::src1_modifiers);
2151
2152 CommutedMI->setDesc(get(CommutedOpcode));
2153 }
2154
2155 return CommutedMI;
2156}
2157
2158// This needs to be implemented because the source modifiers may be inserted
2159// between the true commutable operands, and the base
2160// TargetInstrInfo::commuteInstruction uses it.
2161bool SIInstrInfo::findCommutedOpIndices(const MachineInstr &MI,
2162 unsigned &SrcOpIdx0,
2163 unsigned &SrcOpIdx1) const {
2164 return findCommutedOpIndices(MI.getDesc(), SrcOpIdx0, SrcOpIdx1);
2165}
2166
2167bool SIInstrInfo::findCommutedOpIndices(MCInstrDesc Desc, unsigned &SrcOpIdx0,
2168 unsigned &SrcOpIdx1) const {
2169 if (!Desc.isCommutable())
2170 return false;
2171
2172 unsigned Opc = Desc.getOpcode();
2173 int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0);
2174 if (Src0Idx == -1)
2175 return false;
2176
2177 int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1);
2178 if (Src1Idx == -1)
2179 return false;
2180
2181 return fixCommutedOpIndices(SrcOpIdx0, SrcOpIdx1, Src0Idx, Src1Idx);
2182}
2183
2184bool SIInstrInfo::isBranchOffsetInRange(unsigned BranchOp,
2185 int64_t BrOffset) const {
2186 // BranchRelaxation should never have to check s_setpc_b64 because its dest
2187 // block is unanalyzable.
2188 assert(BranchOp != AMDGPU::S_SETPC_B64)((void)0);
2189
2190 // Convert to dwords.
2191 BrOffset /= 4;
2192
2193 // The branch instructions do PC += signext(SIMM16 * 4) + 4, so the offset is
2194 // from the next instruction.
2195 BrOffset -= 1;
2196
2197 return isIntN(BranchOffsetBits, BrOffset);
2198}
2199
2200MachineBasicBlock *SIInstrInfo::getBranchDestBlock(
2201 const MachineInstr &MI) const {
2202 if (MI.getOpcode() == AMDGPU::S_SETPC_B64) {
2203 // This would be a difficult analysis to perform, but can always be legal so
2204 // there's no need to analyze it.
2205 return nullptr;
2206 }
2207
2208 return MI.getOperand(0).getMBB();
2209}
2210
2211unsigned SIInstrInfo::insertIndirectBranch(MachineBasicBlock &MBB,
2212 MachineBasicBlock &DestBB,
2213 const DebugLoc &DL,
2214 int64_t BrOffset,
2215 RegScavenger *RS) const {
2216 assert(RS && "RegScavenger required for long branching")((void)0);
2217 assert(MBB.empty() &&((void)0)
2218 "new block should be inserted for expanding unconditional branch")((void)0);
2219 assert(MBB.pred_size() == 1)((void)0);
2220
2221 MachineFunction *MF = MBB.getParent();
2222 MachineRegisterInfo &MRI = MF->getRegInfo();
2223
2224 // FIXME: Virtual register workaround for RegScavenger not working with empty
2225 // blocks.
2226 Register PCReg = MRI.createVirtualRegister(&AMDGPU::SReg_64RegClass);
2227
2228 auto I = MBB.end();
2229
2230 // We need to compute the offset relative to the instruction immediately after
2231 // s_getpc_b64. Insert pc arithmetic code before last terminator.
2232 MachineInstr *GetPC = BuildMI(MBB, I, DL, get(AMDGPU::S_GETPC_B64), PCReg);
2233
2234 auto &MCCtx = MF->getContext();
2235 MCSymbol *PostGetPCLabel =
2236 MCCtx.createTempSymbol("post_getpc", /*AlwaysAddSuffix=*/true);
2237 GetPC->setPostInstrSymbol(*MF, PostGetPCLabel);
2238
2239 MCSymbol *OffsetLo =
2240 MCCtx.createTempSymbol("offset_lo", /*AlwaysAddSuffix=*/true);
2241 MCSymbol *OffsetHi =
2242 MCCtx.createTempSymbol("offset_hi", /*AlwaysAddSuffix=*/true);
2243 BuildMI(MBB, I, DL, get(AMDGPU::S_ADD_U32))
2244 .addReg(PCReg, RegState::Define, AMDGPU::sub0)
2245 .addReg(PCReg, 0, AMDGPU::sub0)
2246 .addSym(OffsetLo, MO_FAR_BRANCH_OFFSET);
2247 BuildMI(MBB, I, DL, get(AMDGPU::S_ADDC_U32))
2248 .addReg(PCReg, RegState::Define, AMDGPU::sub1)
2249 .addReg(PCReg, 0, AMDGPU::sub1)
2250 .addSym(OffsetHi, MO_FAR_BRANCH_OFFSET);
2251
2252 // Insert the indirect branch after the other terminator.
2253 BuildMI(&MBB, DL, get(AMDGPU::S_SETPC_B64))
2254 .addReg(PCReg);
2255
2256 auto ComputeBlockSize = [](const TargetInstrInfo *TII,
2257 const MachineBasicBlock &MBB) {
2258 unsigned Size = 0;
2259 for (const MachineInstr &MI : MBB)
2260 Size += TII->getInstSizeInBytes(MI);
2261 return Size;
2262 };
2263
2264 // FIXME: If spilling is necessary, this will fail because this scavenger has
2265 // no emergency stack slots. It is non-trivial to spill in this situation,
2266 // because the restore code needs to be specially placed after the
2267 // jump. BranchRelaxation then needs to be made aware of the newly inserted
2268 // block.
2269 //
2270 // If a spill is needed for the pc register pair, we need to insert a spill
2271 // restore block right before the destination block, and insert a short branch
2272 // into the old destination block's fallthrough predecessor.
2273 // e.g.:
2274 //
2275 // s_cbranch_scc0 skip_long_branch:
2276 //
2277 // long_branch_bb:
2278 // spill s[8:9]
2279 // s_getpc_b64 s[8:9]
2280 // s_add_u32 s8, s8, restore_bb
2281 // s_addc_u32 s9, s9, 0
2282 // s_setpc_b64 s[8:9]
2283 //
2284 // skip_long_branch:
2285 // foo;
2286 //
2287 // .....
2288 //
2289 // dest_bb_fallthrough_predecessor:
2290 // bar;
2291 // s_branch dest_bb
2292 //
2293 // restore_bb:
2294 // restore s[8:9]
2295 // fallthrough dest_bb
2296 ///
2297 // dest_bb:
2298 // buzz;
2299
2300 RS->enterBasicBlockEnd(MBB);
2301 Register Scav = RS->scavengeRegisterBackwards(
2302 AMDGPU::SReg_64RegClass,
2303 MachineBasicBlock::iterator(GetPC), false, 0);
2304 MRI.replaceRegWith(PCReg, Scav);
2305 MRI.clearVirtRegs();
2306 RS->setRegUsed(Scav);
2307
2308 // Now, the distance could be defined.
2309 auto *Offset = MCBinaryExpr::createSub(
2310 MCSymbolRefExpr::create(DestBB.getSymbol(), MCCtx),
2311 MCSymbolRefExpr::create(PostGetPCLabel, MCCtx), MCCtx);
2312 // Add offset assignments.
2313 auto *Mask = MCConstantExpr::create(0xFFFFFFFFULL, MCCtx);
2314 OffsetLo->setVariableValue(MCBinaryExpr::createAnd(Offset, Mask, MCCtx));
2315 auto *ShAmt = MCConstantExpr::create(32, MCCtx);
2316 OffsetHi->setVariableValue(MCBinaryExpr::createAShr(Offset, ShAmt, MCCtx));
2317 return ComputeBlockSize(this, MBB);
2318}
2319
2320unsigned SIInstrInfo::getBranchOpcode(SIInstrInfo::BranchPredicate Cond) {
2321 switch (Cond) {
2322 case SIInstrInfo::SCC_TRUE:
2323 return AMDGPU::S_CBRANCH_SCC1;
2324 case SIInstrInfo::SCC_FALSE:
2325 return AMDGPU::S_CBRANCH_SCC0;
2326 case SIInstrInfo::VCCNZ:
2327 return AMDGPU::S_CBRANCH_VCCNZ;
2328 case SIInstrInfo::VCCZ:
2329 return AMDGPU::S_CBRANCH_VCCZ;
2330 case SIInstrInfo::EXECNZ:
2331 return AMDGPU::S_CBRANCH_EXECNZ;
2332 case SIInstrInfo::EXECZ:
2333 return AMDGPU::S_CBRANCH_EXECZ;
2334 default:
2335 llvm_unreachable("invalid branch predicate")__builtin_unreachable();
2336 }
2337}
2338
2339SIInstrInfo::BranchPredicate SIInstrInfo::getBranchPredicate(unsigned Opcode) {
2340 switch (Opcode) {
2341 case AMDGPU::S_CBRANCH_SCC0:
2342 return SCC_FALSE;
2343 case AMDGPU::S_CBRANCH_SCC1:
2344 return SCC_TRUE;
2345 case AMDGPU::S_CBRANCH_VCCNZ:
2346 return VCCNZ;
2347 case AMDGPU::S_CBRANCH_VCCZ:
2348 return VCCZ;
2349 case AMDGPU::S_CBRANCH_EXECNZ:
2350 return EXECNZ;
2351 case AMDGPU::S_CBRANCH_EXECZ:
2352 return EXECZ;
2353 default:
2354 return INVALID_BR;
2355 }
2356}
2357
2358bool SIInstrInfo::analyzeBranchImpl(MachineBasicBlock &MBB,
2359 MachineBasicBlock::iterator I,
2360 MachineBasicBlock *&TBB,
2361 MachineBasicBlock *&FBB,
2362 SmallVectorImpl<MachineOperand> &Cond,
2363 bool AllowModify) const {
2364 if (I->getOpcode() == AMDGPU::S_BRANCH) {
2365 // Unconditional Branch
2366 TBB = I->getOperand(0).getMBB();
2367 return false;
2368 }
2369
2370 MachineBasicBlock *CondBB = nullptr;
2371
2372 if (I->getOpcode() == AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO) {
2373 CondBB = I->getOperand(1).getMBB();
2374 Cond.push_back(I->getOperand(0));
2375 } else {
2376 BranchPredicate Pred = getBranchPredicate(I->getOpcode());
2377 if (Pred == INVALID_BR)
2378 return true;
2379
2380 CondBB = I->getOperand(0).getMBB();
2381 Cond.push_back(MachineOperand::CreateImm(Pred));
2382 Cond.push_back(I->getOperand(1)); // Save the branch register.
2383 }
2384 ++I;
2385
2386 if (I == MBB.end()) {
2387 // Conditional branch followed by fall-through.
2388 TBB = CondBB;
2389 return false;
2390 }
2391
2392 if (I->getOpcode() == AMDGPU::S_BRANCH) {
2393 TBB = CondBB;
2394 FBB = I->getOperand(0).getMBB();
2395 return false;
2396 }
2397
2398 return true;
2399}
2400
2401bool SIInstrInfo::analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
2402 MachineBasicBlock *&FBB,
2403 SmallVectorImpl<MachineOperand> &Cond,
2404 bool AllowModify) const {
2405 MachineBasicBlock::iterator I = MBB.getFirstTerminator();
2406 auto E = MBB.end();
2407 if (I == E)
2408 return false;
2409
2410 // Skip over the instructions that are artificially terminators for special
2411 // exec management.
2412 while (I != E && !I->isBranch() && !I->isReturn()) {
2413 switch (I->getOpcode()) {
2414 case AMDGPU::S_MOV_B64_term:
2415 case AMDGPU::S_XOR_B64_term:
2416 case AMDGPU::S_OR_B64_term:
2417 case AMDGPU::S_ANDN2_B64_term:
2418 case AMDGPU::S_AND_B64_term:
2419 case AMDGPU::S_MOV_B32_term:
2420 case AMDGPU::S_XOR_B32_term:
2421 case AMDGPU::S_OR_B32_term:
2422 case AMDGPU::S_ANDN2_B32_term:
2423 case AMDGPU::S_AND_B32_term:
2424 break;
2425 case AMDGPU::SI_IF:
2426 case AMDGPU::SI_ELSE:
2427 case AMDGPU::SI_KILL_I1_TERMINATOR:
2428 case AMDGPU::SI_KILL_F32_COND_IMM_TERMINATOR:
2429 // FIXME: It's messy that these need to be considered here at all.
2430 return true;
2431 default:
2432 llvm_unreachable("unexpected non-branch terminator inst")__builtin_unreachable();
2433 }
2434
2435 ++I;
2436 }
2437
2438 if (I == E)
2439 return false;
2440
2441 return analyzeBranchImpl(MBB, I, TBB, FBB, Cond, AllowModify);
2442}
2443
2444unsigned SIInstrInfo::removeBranch(MachineBasicBlock &MBB,
2445 int *BytesRemoved) const {
2446 MachineBasicBlock::iterator I = MBB.getFirstTerminator();
2447
2448 unsigned Count = 0;
2449 unsigned RemovedSize = 0;
2450 while (I != MBB.end()) {
2451 MachineBasicBlock::iterator Next = std::next(I);
2452 RemovedSize += getInstSizeInBytes(*I);
2453 I->eraseFromParent();
2454 ++Count;
2455 I = Next;
2456 }
2457
2458 if (BytesRemoved)
2459 *BytesRemoved = RemovedSize;
2460
2461 return Count;
2462}
2463
2464// Copy the flags onto the implicit condition register operand.
2465static void preserveCondRegFlags(MachineOperand &CondReg,
2466 const MachineOperand &OrigCond) {
2467 CondReg.setIsUndef(OrigCond.isUndef());
2468 CondReg.setIsKill(OrigCond.isKill());
2469}
2470
2471unsigned SIInstrInfo::insertBranch(MachineBasicBlock &MBB,
2472 MachineBasicBlock *TBB,
2473 MachineBasicBlock *FBB,
2474 ArrayRef<MachineOperand> Cond,
2475 const DebugLoc &DL,
2476 int *BytesAdded) const {
2477 if (!FBB && Cond.empty()) {
2478 BuildMI(&MBB, DL, get(AMDGPU::S_BRANCH))
2479 .addMBB(TBB);
2480 if (BytesAdded)
2481 *BytesAdded = ST.hasOffset3fBug() ? 8 : 4;
2482 return 1;
2483 }
2484
2485 if(Cond.size() == 1 && Cond[0].isReg()) {
2486 BuildMI(&MBB, DL, get(AMDGPU::SI_NON_UNIFORM_BRCOND_PSEUDO))
2487 .add(Cond[0])
2488 .addMBB(TBB);
2489 return 1;
2490 }
2491
2492 assert(TBB && Cond[0].isImm())((void)0);
2493
2494 unsigned Opcode
2495 = getBranchOpcode(static_cast<BranchPredicate>(Cond[0].getImm()));
2496
2497 if (!FBB) {
2498 Cond[1].isUndef();
2499 MachineInstr *CondBr =
2500 BuildMI(&MBB, DL, get(Opcode))
2501 .addMBB(TBB);
2502
2503 // Copy the flags onto the implicit condition register operand.
2504 preserveCondRegFlags(CondBr->getOperand(1), Cond[1]);
2505 fixImplicitOperands(*CondBr);
2506
2507 if (BytesAdded)
2508 *BytesAdded = ST.hasOffset3fBug() ? 8 : 4;
2509 return 1;
2510 }
2511
2512 assert(TBB && FBB)((void)0);
2513
2514 MachineInstr *CondBr =
2515 BuildMI(&MBB, DL, get(Opcode))
2516 .addMBB(TBB);
2517 fixImplicitOperands(*CondBr);
2518 BuildMI(&MBB, DL, get(AMDGPU::S_BRANCH))
2519 .addMBB(FBB);
2520
2521 MachineOperand &CondReg = CondBr->getOperand(1);
2522 CondReg.setIsUndef(Cond[1].isUndef());
2523 CondReg.setIsKill(Cond[1].isKill());
2524
2525 if (BytesAdded)
2526 *BytesAdded = ST.hasOffset3fBug() ? 16 : 8;
2527
2528 return 2;
2529}
2530
2531bool SIInstrInfo::reverseBranchCondition(
2532 SmallVectorImpl<MachineOperand> &Cond) const {
2533 if (Cond.size() != 2) {
2534 return true;
2535 }
2536
2537 if (Cond[0].isImm()) {
2538 Cond[0].setImm(-Cond[0].getImm());
2539 return false;
2540 }
2541
2542 return true;
2543}
2544
2545bool SIInstrInfo::canInsertSelect(const MachineBasicBlock &MBB,
2546 ArrayRef<MachineOperand> Cond,
2547 Register DstReg, Register TrueReg,
2548 Register FalseReg, int &CondCycles,
2549 int &TrueCycles, int &FalseCycles) const {
2550 switch (Cond[0].getImm()) {
2551 case VCCNZ:
2552 case VCCZ: {
2553 const MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
2554 const TargetRegisterClass *RC = MRI.getRegClass(TrueReg);
2555 if (MRI.getRegClass(FalseReg) != RC)
2556 return false;
2557
2558 int NumInsts = AMDGPU::getRegBitWidth(RC->getID()) / 32;
2559 CondCycles = TrueCycles = FalseCycles = NumInsts; // ???
2560
2561 // Limit to equal cost for branch vs. N v_cndmask_b32s.
2562 return RI.hasVGPRs(RC) && NumInsts <= 6;
2563 }
2564 case SCC_TRUE:
2565 case SCC_FALSE: {
2566 // FIXME: We could insert for VGPRs if we could replace the original compare
2567 // with a vector one.
2568 const MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
2569 const TargetRegisterClass *RC = MRI.getRegClass(TrueReg);
2570 if (MRI.getRegClass(FalseReg) != RC)
2571 return false;
2572
2573 int NumInsts = AMDGPU::getRegBitWidth(RC->getID()) / 32;
2574
2575 // Multiples of 8 can do s_cselect_b64
2576 if (NumInsts % 2 == 0)
2577 NumInsts /= 2;
2578
2579 CondCycles = TrueCycles = FalseCycles = NumInsts; // ???
2580 return RI.isSGPRClass(RC);
2581 }
2582 default:
2583 return false;
2584 }
2585}
2586
2587void SIInstrInfo::insertSelect(MachineBasicBlock &MBB,
2588 MachineBasicBlock::iterator I, const DebugLoc &DL,
2589 Register DstReg, ArrayRef<MachineOperand> Cond,
2590 Register TrueReg, Register FalseReg) const {
2591 BranchPredicate Pred = static_cast<BranchPredicate>(Cond[0].getImm());
2592 if (Pred == VCCZ || Pred == SCC_FALSE) {
2593 Pred = static_cast<BranchPredicate>(-Pred);
2594 std::swap(TrueReg, FalseReg);
2595 }
2596
2597 MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
2598 const TargetRegisterClass *DstRC = MRI.getRegClass(DstReg);
2599 unsigned DstSize = RI.getRegSizeInBits(*DstRC);
2600
2601 if (DstSize == 32) {
2602 MachineInstr *Select;
2603 if (Pred == SCC_TRUE) {
2604 Select = BuildMI(MBB, I, DL, get(AMDGPU::S_CSELECT_B32), DstReg)
2605 .addReg(TrueReg)
2606 .addReg(FalseReg);
2607 } else {
2608 // Instruction's operands are backwards from what is expected.
2609 Select = BuildMI(MBB, I, DL, get(AMDGPU::V_CNDMASK_B32_e32), DstReg)
2610 .addReg(FalseReg)
2611 .addReg(TrueReg);
2612 }
2613
2614 preserveCondRegFlags(Select->getOperand(3), Cond[1]);
2615 return;
2616 }
2617
2618 if (DstSize == 64 && Pred == SCC_TRUE) {
2619 MachineInstr *Select =
2620 BuildMI(MBB, I, DL, get(AMDGPU::S_CSELECT_B64), DstReg)
2621 .addReg(TrueReg)
2622 .addReg(FalseReg);
2623
2624 preserveCondRegFlags(Select->getOperand(3), Cond[1]);
2625 return;
2626 }
2627
2628 static const int16_t Sub0_15[] = {
2629 AMDGPU::sub0, AMDGPU::sub1, AMDGPU::sub2, AMDGPU::sub3,
2630 AMDGPU::sub4, AMDGPU::sub5, AMDGPU::sub6, AMDGPU::sub7,
2631 AMDGPU::sub8, AMDGPU::sub9, AMDGPU::sub10, AMDGPU::sub11,
2632 AMDGPU::sub12, AMDGPU::sub13, AMDGPU::sub14, AMDGPU::sub15,
2633 };
2634
2635 static const int16_t Sub0_15_64[] = {
2636 AMDGPU::sub0_sub1, AMDGPU::sub2_sub3,
2637 AMDGPU::sub4_sub5, AMDGPU::sub6_sub7,
2638 AMDGPU::sub8_sub9, AMDGPU::sub10_sub11,
2639 AMDGPU::sub12_sub13, AMDGPU::sub14_sub15,
2640 };
2641
2642 unsigned SelOp = AMDGPU::V_CNDMASK_B32_e32;
2643 const TargetRegisterClass *EltRC = &AMDGPU::VGPR_32RegClass;
2644 const int16_t *SubIndices = Sub0_15;
2645 int NElts = DstSize / 32;
2646
2647 // 64-bit select is only available for SALU.
2648 // TODO: Split 96-bit into 64-bit and 32-bit, not 3x 32-bit.
2649 if (Pred == SCC_TRUE) {
2650 if (NElts % 2) {
2651 SelOp = AMDGPU::S_CSELECT_B32;
2652 EltRC = &AMDGPU::SGPR_32RegClass;
2653 } else {
2654 SelOp = AMDGPU::S_CSELECT_B64;
2655 EltRC = &AMDGPU::SGPR_64RegClass;
2656 SubIndices = Sub0_15_64;
2657 NElts /= 2;
2658 }
2659 }
2660
2661 MachineInstrBuilder MIB = BuildMI(
2662 MBB, I, DL, get(AMDGPU::REG_SEQUENCE), DstReg);
2663
2664 I = MIB->getIterator();
2665
2666 SmallVector<Register, 8> Regs;
2667 for (int Idx = 0; Idx != NElts; ++Idx) {
2668 Register DstElt = MRI.createVirtualRegister(EltRC);
2669 Regs.push_back(DstElt);
2670
2671 unsigned SubIdx = SubIndices[Idx];
2672
2673 MachineInstr *Select;
2674 if (SelOp == AMDGPU::V_CNDMASK_B32_e32) {
2675 Select =
2676 BuildMI(MBB, I, DL, get(SelOp), DstElt)
2677 .addReg(FalseReg, 0, SubIdx)
2678 .addReg(TrueReg, 0, SubIdx);
2679 } else {
2680 Select =
2681 BuildMI(MBB, I, DL, get(SelOp), DstElt)
2682 .addReg(TrueReg, 0, SubIdx)
2683 .addReg(FalseReg, 0, SubIdx);
2684 }
2685
2686 preserveCondRegFlags(Select->getOperand(3), Cond[1]);
2687 fixImplicitOperands(*Select);
2688
2689 MIB.addReg(DstElt)
2690 .addImm(SubIdx);
2691 }
2692}
2693
2694bool SIInstrInfo::isFoldableCopy(const MachineInstr &MI) const {
2695 switch (MI.getOpcode()) {
2696 case AMDGPU::V_MOV_B32_e32:
2697 case AMDGPU::V_MOV_B32_e64:
2698 case AMDGPU::V_MOV_B64_PSEUDO: {
2699 // If there are additional implicit register operands, this may be used for
2700 // register indexing so the source register operand isn't simply copied.
2701 unsigned NumOps = MI.getDesc().getNumOperands() +
2702 MI.getDesc().getNumImplicitUses();
2703
2704 return MI.getNumOperands() == NumOps;
2705 }
2706 case AMDGPU::S_MOV_B32:
2707 case AMDGPU::S_MOV_B64:
2708 case AMDGPU::COPY:
2709 case AMDGPU::V_ACCVGPR_WRITE_B32_e64:
2710 case AMDGPU::V_ACCVGPR_READ_B32_e64:
2711 case AMDGPU::V_ACCVGPR_MOV_B32:
2712 return true;
2713 default:
2714 return false;
2715 }
2716}
2717
2718unsigned SIInstrInfo::getAddressSpaceForPseudoSourceKind(
2719 unsigned Kind) const {
2720 switch(Kind) {
2721 case PseudoSourceValue::Stack:
2722 case PseudoSourceValue::FixedStack:
2723 return AMDGPUAS::PRIVATE_ADDRESS;
2724 case PseudoSourceValue::ConstantPool:
2725 case PseudoSourceValue::GOT:
2726 case PseudoSourceValue::JumpTable:
2727 case PseudoSourceValue::GlobalValueCallEntry:
2728 case PseudoSourceValue::ExternalSymbolCallEntry:
2729 case PseudoSourceValue::TargetCustom:
2730 return AMDGPUAS::CONSTANT_ADDRESS;
2731 }
2732 return AMDGPUAS::FLAT_ADDRESS;
2733}
2734
2735static void removeModOperands(MachineInstr &MI) {
2736 unsigned Opc = MI.getOpcode();
2737 int Src0ModIdx = AMDGPU::getNamedOperandIdx(Opc,
2738 AMDGPU::OpName::src0_modifiers);
2739 int Src1ModIdx = AMDGPU::getNamedOperandIdx(Opc,
2740 AMDGPU::OpName::src1_modifiers);
2741 int Src2ModIdx = AMDGPU::getNamedOperandIdx(Opc,
2742 AMDGPU::OpName::src2_modifiers);
2743
2744 MI.RemoveOperand(Src2ModIdx);
2745 MI.RemoveOperand(Src1ModIdx);
2746 MI.RemoveOperand(Src0ModIdx);
2747}
2748
2749bool SIInstrInfo::FoldImmediate(MachineInstr &UseMI, MachineInstr &DefMI,
2750 Register Reg, MachineRegisterInfo *MRI) const {
2751 if (!MRI->hasOneNonDBGUse(Reg))
2752 return false;
2753
2754 switch (DefMI.getOpcode()) {
2755 default:
2756 return false;
2757 case AMDGPU::S_MOV_B64:
2758 // TODO: We could fold 64-bit immediates, but this get compilicated
2759 // when there are sub-registers.
2760 return false;
2761
2762 case AMDGPU::V_MOV_B32_e32:
2763 case AMDGPU::S_MOV_B32:
2764 case AMDGPU::V_ACCVGPR_WRITE_B32_e64:
2765 break;
2766 }
2767
2768 const MachineOperand *ImmOp = getNamedOperand(DefMI, AMDGPU::OpName::src0);
2769 assert(ImmOp)((void)0);
2770 // FIXME: We could handle FrameIndex values here.
2771 if (!ImmOp->isImm())
2772 return false;
2773
2774 unsigned Opc = UseMI.getOpcode();
2775 if (Opc == AMDGPU::COPY) {
2776 Register DstReg = UseMI.getOperand(0).getReg();
2777 bool Is16Bit = getOpSize(UseMI, 0) == 2;
2778 bool isVGPRCopy = RI.isVGPR(*MRI, DstReg);
2779 unsigned NewOpc = isVGPRCopy ? AMDGPU::V_MOV_B32_e32 : AMDGPU::S_MOV_B32;
2780 APInt Imm(32, ImmOp->getImm());
2781
2782 if (UseMI.getOperand(1).getSubReg() == AMDGPU::hi16)
2783 Imm = Imm.ashr(16);
2784
2785 if (RI.isAGPR(*MRI, DstReg)) {
2786 if (!isInlineConstant(Imm))
2787 return false;
2788 NewOpc = AMDGPU::V_ACCVGPR_WRITE_B32_e64;
2789 }
2790
2791 if (Is16Bit) {
2792 if (isVGPRCopy)
2793 return false; // Do not clobber vgpr_hi16
2794
2795 if (DstReg.isVirtual() &&
2796 UseMI.getOperand(0).getSubReg() != AMDGPU::lo16)
2797 return false;
2798
2799 UseMI.getOperand(0).setSubReg(0);
2800 if (DstReg.isPhysical()) {
2801 DstReg = RI.get32BitRegister(DstReg);
2802 UseMI.getOperand(0).setReg(DstReg);
2803 }
2804 assert(UseMI.getOperand(1).getReg().isVirtual())((void)0);
2805 }
2806
2807 UseMI.setDesc(get(NewOpc));
2808 UseMI.getOperand(1).ChangeToImmediate(Imm.getSExtValue());
2809 UseMI.addImplicitDefUseOperands(*UseMI.getParent()->getParent());
2810 return true;
2811 }
2812
2813 if (Opc == AMDGPU::V_MAD_F32_e64 || Opc == AMDGPU::V_MAC_F32_e64 ||
2814 Opc == AMDGPU::V_MAD_F16_e64 || Opc == AMDGPU::V_MAC_F16_e64 ||
2815 Opc == AMDGPU::V_FMA_F32_e64 || Opc == AMDGPU::V_FMAC_F32_e64 ||
2816 Opc == AMDGPU::V_FMA_F16_e64 || Opc == AMDGPU::V_FMAC_F16_e64) {
2817 // Don't fold if we are using source or output modifiers. The new VOP2
2818 // instructions don't have them.
2819 if (hasAnyModifiersSet(UseMI))
2820 return false;
2821
2822 // If this is a free constant, there's no reason to do this.
2823 // TODO: We could fold this here instead of letting SIFoldOperands do it
2824 // later.
2825 MachineOperand *Src0 = getNamedOperand(UseMI, AMDGPU::OpName::src0);
2826
2827 // Any src operand can be used for the legality check.
2828 if (isInlineConstant(UseMI, *Src0, *ImmOp))
2829 return false;
2830
2831 bool IsF32 = Opc == AMDGPU::V_MAD_F32_e64 || Opc == AMDGPU::V_MAC_F32_e64 ||
2832 Opc == AMDGPU::V_FMA_F32_e64 || Opc == AMDGPU::V_FMAC_F32_e64;
2833 bool IsFMA = Opc == AMDGPU::V_FMA_F32_e64 || Opc == AMDGPU::V_FMAC_F32_e64 ||
2834 Opc == AMDGPU::V_FMA_F16_e64 || Opc == AMDGPU::V_FMAC_F16_e64;
2835 MachineOperand *Src1 = getNamedOperand(UseMI, AMDGPU::OpName::src1);
2836 MachineOperand *Src2 = getNamedOperand(UseMI, AMDGPU::OpName::src2);
2837
2838 // Multiplied part is the constant: Use v_madmk_{f16, f32}.
2839 // We should only expect these to be on src0 due to canonicalizations.
2840 if (Src0->isReg() && Src0->getReg() == Reg) {
2841 if (!Src1->isReg() || RI.isSGPRClass(MRI->getRegClass(Src1->getReg())))
2842 return false;
2843
2844 if (!Src2->isReg() || RI.isSGPRClass(MRI->getRegClass(Src2->getReg())))
2845 return false;
2846
2847 unsigned NewOpc =
2848 IsFMA ? (IsF32 ? AMDGPU::V_FMAMK_F32 : AMDGPU::V_FMAMK_F16)
2849 : (IsF32 ? AMDGPU::V_MADMK_F32 : AMDGPU::V_MADMK_F16);
2850 if (pseudoToMCOpcode(NewOpc) == -1)
2851 return false;
2852
2853 // We need to swap operands 0 and 1 since madmk constant is at operand 1.
2854
2855 const int64_t Imm = ImmOp->getImm();
2856
2857 // FIXME: This would be a lot easier if we could return a new instruction
2858 // instead of having to modify in place.
2859
2860 // Remove these first since they are at the end.
2861 UseMI.RemoveOperand(
2862 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::omod));
2863 UseMI.RemoveOperand(
2864 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::clamp));
2865
2866 Register Src1Reg = Src1->getReg();
2867 unsigned Src1SubReg = Src1->getSubReg();
2868 Src0->setReg(Src1Reg);
2869 Src0->setSubReg(Src1SubReg);
2870 Src0->setIsKill(Src1->isKill());
2871
2872 if (Opc == AMDGPU::V_MAC_F32_e64 ||
2873 Opc == AMDGPU::V_MAC_F16_e64 ||
2874 Opc == AMDGPU::V_FMAC_F32_e64 ||
2875 Opc == AMDGPU::V_FMAC_F16_e64)
2876 UseMI.untieRegOperand(
2877 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2));
2878
2879 Src1->ChangeToImmediate(Imm);
2880
2881 removeModOperands(UseMI);
2882 UseMI.setDesc(get(NewOpc));
2883
2884 bool DeleteDef = MRI->hasOneNonDBGUse(Reg);
2885 if (DeleteDef)
2886 DefMI.eraseFromParent();
2887
2888 return true;
2889 }
2890
2891 // Added part is the constant: Use v_madak_{f16, f32}.
2892 if (Src2->isReg() && Src2->getReg() == Reg) {
2893 // Not allowed to use constant bus for another operand.
2894 // We can however allow an inline immediate as src0.
2895 bool Src0Inlined = false;
2896 if (Src0->isReg()) {
2897 // Try to inline constant if possible.
2898 // If the Def moves immediate and the use is single
2899 // We are saving VGPR here.
2900 MachineInstr *Def = MRI->getUniqueVRegDef(Src0->getReg());
2901 if (Def && Def->isMoveImmediate() &&
2902 isInlineConstant(Def->getOperand(1)) &&
2903 MRI->hasOneUse(Src0->getReg())) {
2904 Src0->ChangeToImmediate(Def->getOperand(1).getImm());
2905 Src0Inlined = true;
2906 } else if ((Src0->getReg().isPhysical() &&
2907 (ST.getConstantBusLimit(Opc) <= 1 &&
2908 RI.isSGPRClass(RI.getPhysRegClass(Src0->getReg())))) ||
2909 (Src0->getReg().isVirtual() &&
2910 (ST.getConstantBusLimit(Opc) <= 1 &&
2911 RI.isSGPRClass(MRI->getRegClass(Src0->getReg())))))
2912 return false;
2913 // VGPR is okay as Src0 - fallthrough
2914 }
2915
2916 if (Src1->isReg() && !Src0Inlined ) {
2917 // We have one slot for inlinable constant so far - try to fill it
2918 MachineInstr *Def = MRI->getUniqueVRegDef(Src1->getReg());
2919 if (Def && Def->isMoveImmediate() &&
2920 isInlineConstant(Def->getOperand(1)) &&
2921 MRI->hasOneUse(Src1->getReg()) &&
2922 commuteInstruction(UseMI)) {
2923 Src0->ChangeToImmediate(Def->getOperand(1).getImm());
2924 } else if ((Src1->getReg().isPhysical() &&
2925 RI.isSGPRClass(RI.getPhysRegClass(Src1->getReg()))) ||
2926 (Src1->getReg().isVirtual() &&
2927 RI.isSGPRClass(MRI->getRegClass(Src1->getReg()))))
2928 return false;
2929 // VGPR is okay as Src1 - fallthrough
2930 }
2931
2932 unsigned NewOpc =
2933 IsFMA ? (IsF32 ? AMDGPU::V_FMAAK_F32 : AMDGPU::V_FMAAK_F16)
2934 : (IsF32 ? AMDGPU::V_MADAK_F32 : AMDGPU::V_MADAK_F16);
2935 if (pseudoToMCOpcode(NewOpc) == -1)
2936 return false;
2937
2938 const int64_t Imm = ImmOp->getImm();
2939
2940 // FIXME: This would be a lot easier if we could return a new instruction
2941 // instead of having to modify in place.
2942
2943 // Remove these first since they are at the end.
2944 UseMI.RemoveOperand(
2945 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::omod));
2946 UseMI.RemoveOperand(
2947 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::clamp));
2948
2949 if (Opc == AMDGPU::V_MAC_F32_e64 ||
2950 Opc == AMDGPU::V_MAC_F16_e64 ||
2951 Opc == AMDGPU::V_FMAC_F32_e64 ||
2952 Opc == AMDGPU::V_FMAC_F16_e64)
2953 UseMI.untieRegOperand(
2954 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2));
2955
2956 // ChangingToImmediate adds Src2 back to the instruction.
2957 Src2->ChangeToImmediate(Imm);
2958
2959 // These come before src2.
2960 removeModOperands(UseMI);
2961 UseMI.setDesc(get(NewOpc));
2962 // It might happen that UseMI was commuted
2963 // and we now have SGPR as SRC1. If so 2 inlined
2964 // constant and SGPR are illegal.
2965 legalizeOperands(UseMI);
2966
2967 bool DeleteDef = MRI->hasOneNonDBGUse(Reg);
2968 if (DeleteDef)
2969 DefMI.eraseFromParent();
2970
2971 return true;
2972 }
2973 }
2974
2975 return false;
2976}
2977
2978static bool
2979memOpsHaveSameBaseOperands(ArrayRef<const MachineOperand *> BaseOps1,
2980 ArrayRef<const MachineOperand *> BaseOps2) {
2981 if (BaseOps1.size() != BaseOps2.size())
2982 return false;
2983 for (size_t I = 0, E = BaseOps1.size(); I < E; ++I) {
2984 if (!BaseOps1[I]->isIdenticalTo(*BaseOps2[I]))
2985 return false;
2986 }
2987 return true;
2988}
2989
2990static bool offsetsDoNotOverlap(int WidthA, int OffsetA,
2991 int WidthB, int OffsetB) {
2992 int LowOffset = OffsetA < OffsetB ? OffsetA : OffsetB;
2993 int HighOffset = OffsetA < OffsetB ? OffsetB : OffsetA;
2994 int LowWidth = (LowOffset == OffsetA) ? WidthA : WidthB;
2995 return LowOffset + LowWidth <= HighOffset;
2996}
2997
2998bool SIInstrInfo::checkInstOffsetsDoNotOverlap(const MachineInstr &MIa,
2999 const MachineInstr &MIb) const {
3000 SmallVector<const MachineOperand *, 4> BaseOps0, BaseOps1;
3001 int64_t Offset0, Offset1;
3002 unsigned Dummy0, Dummy1;
3003 bool Offset0IsScalable, Offset1IsScalable;
3004 if (!getMemOperandsWithOffsetWidth(MIa, BaseOps0, Offset0, Offset0IsScalable,
3005 Dummy0, &RI) ||
3006 !getMemOperandsWithOffsetWidth(MIb, BaseOps1, Offset1, Offset1IsScalable,
3007 Dummy1, &RI))
3008 return false;
3009
3010 if (!memOpsHaveSameBaseOperands(BaseOps0, BaseOps1))
3011 return false;
3012
3013 if (!MIa.hasOneMemOperand() || !MIb.hasOneMemOperand()) {
3014 // FIXME: Handle ds_read2 / ds_write2.
3015 return false;
3016 }
3017 unsigned Width0 = MIa.memoperands().front()->getSize();
3018 unsigned Width1 = MIb.memoperands().front()->getSize();
3019 return offsetsDoNotOverlap(Width0, Offset0, Width1, Offset1);
3020}
3021
3022bool SIInstrInfo::areMemAccessesTriviallyDisjoint(const MachineInstr &MIa,
3023 const MachineInstr &MIb) const {
3024 assert(MIa.mayLoadOrStore() &&((void)0)
3025 "MIa must load from or modify a memory location")((void)0);
3026 assert(MIb.mayLoadOrStore() &&((void)0)
3027 "MIb must load from or modify a memory location")((void)0);
3028
3029 if (MIa.hasUnmodeledSideEffects() || MIb.hasUnmodeledSideEffects())
3030 return false;
3031
3032 // XXX - Can we relax this between address spaces?
3033 if (MIa.hasOrderedMemoryRef() || MIb.hasOrderedMemoryRef())
3034 return false;
3035
3036 // TODO: Should we check the address space from the MachineMemOperand? That
3037 // would allow us to distinguish objects we know don't alias based on the
3038 // underlying address space, even if it was lowered to a different one,
3039 // e.g. private accesses lowered to use MUBUF instructions on a scratch
3040 // buffer.
3041 if (isDS(MIa)) {
3042 if (isDS(MIb))
3043 return checkInstOffsetsDoNotOverlap(MIa, MIb);
3044
3045 return !isFLAT(MIb) || isSegmentSpecificFLAT(MIb);
3046 }
3047
3048 if (isMUBUF(MIa) || isMTBUF(MIa)) {
3049 if (isMUBUF(MIb) || isMTBUF(MIb))
3050 return checkInstOffsetsDoNotOverlap(MIa, MIb);
3051
3052 return !isFLAT(MIb) && !isSMRD(MIb);
3053 }
3054
3055 if (isSMRD(MIa)) {
3056 if (isSMRD(MIb))
3057 return checkInstOffsetsDoNotOverlap(MIa, MIb);
3058
3059 return !isFLAT(MIb) && !isMUBUF(MIb) && !isMTBUF(MIb);
3060 }
3061
3062 if (isFLAT(MIa)) {
3063 if (isFLAT(MIb))
3064 return checkInstOffsetsDoNotOverlap(MIa, MIb);
3065
3066 return false;
3067 }
3068
3069 return false;
3070}
3071
3072static int64_t getFoldableImm(const MachineOperand* MO) {
3073 if (!MO->isReg())
3074 return false;
3075 const MachineFunction *MF = MO->getParent()->getParent()->getParent();
3076 const MachineRegisterInfo &MRI = MF->getRegInfo();
3077 auto Def = MRI.getUniqueVRegDef(MO->getReg());
3078 if (Def && Def->getOpcode() == AMDGPU::V_MOV_B32_e32 &&
3079 Def->getOperand(1).isImm())
3080 return Def->getOperand(1).getImm();
3081 return AMDGPU::NoRegister;
3082}
3083
3084static void updateLiveVariables(LiveVariables *LV, MachineInstr &MI,
3085 MachineInstr &NewMI) {
3086 if (LV) {
3087 unsigned NumOps = MI.getNumOperands();
3088 for (unsigned I = 1; I < NumOps; ++I) {
3089 MachineOperand &Op = MI.getOperand(I);
3090 if (Op.isReg() && Op.isKill())
3091 LV->replaceKillInstruction(Op.getReg(), MI, NewMI);
3092 }
3093 }
3094}
3095
3096MachineInstr *SIInstrInfo::convertToThreeAddress(MachineFunction::iterator &MBB,
3097 MachineInstr &MI,
3098 LiveVariables *LV) const {
3099 unsigned Opc = MI.getOpcode();
3100 bool IsF16 = false;
3101 bool IsFMA = Opc == AMDGPU::V_FMAC_F32_e32 || Opc == AMDGPU::V_FMAC_F32_e64 ||
3102 Opc == AMDGPU::V_FMAC_F16_e32 || Opc == AMDGPU::V_FMAC_F16_e64 ||
3103 Opc == AMDGPU::V_FMAC_F64_e32 || Opc == AMDGPU::V_FMAC_F64_e64;
3104 bool IsF64 = Opc == AMDGPU::V_FMAC_F64_e32 || Opc == AMDGPU::V_FMAC_F64_e64;
3105
3106 switch (Opc) {
3107 default:
3108 return nullptr;
3109 case AMDGPU::V_MAC_F16_e64:
3110 case AMDGPU::V_FMAC_F16_e64:
3111 IsF16 = true;
3112 LLVM_FALLTHROUGH[[gnu::fallthrough]];
3113 case AMDGPU::V_MAC_F32_e64:
3114 case AMDGPU::V_FMAC_F32_e64:
3115 case AMDGPU::V_FMAC_F64_e64:
3116 break;
3117 case AMDGPU::V_MAC_F16_e32:
3118 case AMDGPU::V_FMAC_F16_e32:
3119 IsF16 = true;
3120 LLVM_FALLTHROUGH[[gnu::fallthrough]];
3121 case AMDGPU::V_MAC_F32_e32:
3122 case AMDGPU::V_FMAC_F32_e32:
3123 case AMDGPU::V_FMAC_F64_e32: {
3124 int Src0Idx = AMDGPU::getNamedOperandIdx(MI.getOpcode(),
3125 AMDGPU::OpName::src0);
3126 const MachineOperand *Src0 = &MI.getOperand(Src0Idx);
3127 if (!Src0->isReg() && !Src0->isImm())
3128 return nullptr;
3129
3130 if (Src0->isImm() && !isInlineConstant(MI, Src0Idx, *Src0))
3131 return nullptr;
3132
3133 break;
3134 }
3135 }
3136
3137 const MachineOperand *Dst = getNamedOperand(MI, AMDGPU::OpName::vdst);
3138 const MachineOperand *Src0 = getNamedOperand(MI, AMDGPU::OpName::src0);
3139 const MachineOperand *Src0Mods =
3140 getNamedOperand(MI, AMDGPU::OpName::src0_modifiers);
3141 const MachineOperand *Src1 = getNamedOperand(MI, AMDGPU::OpName::src1);
3142 const MachineOperand *Src1Mods =
3143 getNamedOperand(MI, AMDGPU::OpName::src1_modifiers);
3144 const MachineOperand *Src2 = getNamedOperand(MI, AMDGPU::OpName::src2);
3145 const MachineOperand *Clamp = getNamedOperand(MI, AMDGPU::OpName::clamp);
3146 const MachineOperand *Omod = getNamedOperand(MI, AMDGPU::OpName::omod);
3147 MachineInstrBuilder MIB;
3148
3149 if (!Src0Mods && !Src1Mods && !Clamp && !Omod && !IsF64 &&
3150 // If we have an SGPR input, we will violate the constant bus restriction.
3151 (ST.getConstantBusLimit(Opc) > 1 || !Src0->isReg() ||
3152 !RI.isSGPRReg(MBB->getParent()->getRegInfo(), Src0->getReg()))) {
3153 if (auto Imm = getFoldableImm(Src2)) {
3154 unsigned NewOpc =
3155 IsFMA ? (IsF16 ? AMDGPU::V_FMAAK_F16 : AMDGPU::V_FMAAK_F32)
3156 : (IsF16 ? AMDGPU::V_MADAK_F16 : AMDGPU::V_MADAK_F32);
3157 if (pseudoToMCOpcode(NewOpc) != -1) {
3158 MIB = BuildMI(*MBB, MI, MI.getDebugLoc(), get(NewOpc))
3159 .add(*Dst)
3160 .add(*Src0)
3161 .add(*Src1)
3162 .addImm(Imm);
3163 updateLiveVariables(LV, MI, *MIB);
3164 return MIB;
3165 }
3166 }
3167 unsigned NewOpc = IsFMA
3168 ? (IsF16 ? AMDGPU::V_FMAMK_F16 : AMDGPU::V_FMAMK_F32)
3169 : (IsF16 ? AMDGPU::V_MADMK_F16 : AMDGPU::V_MADMK_F32);
3170 if (auto Imm = getFoldableImm(Src1)) {
3171 if (pseudoToMCOpcode(NewOpc) != -1) {
3172 MIB = BuildMI(*MBB, MI, MI.getDebugLoc(), get(NewOpc))
3173 .add(*Dst)
3174 .add(*Src0)
3175 .addImm(Imm)
3176 .add(*Src2);
3177 updateLiveVariables(LV, MI, *MIB);
3178 return MIB;
3179 }
3180 }
3181 if (auto Imm = getFoldableImm(Src0)) {
3182 if (pseudoToMCOpcode(NewOpc) != -1 &&
3183 isOperandLegal(
3184 MI, AMDGPU::getNamedOperandIdx(NewOpc, AMDGPU::OpName::src0),
3185 Src1)) {
3186 MIB = BuildMI(*MBB, MI, MI.getDebugLoc(), get(NewOpc))
3187 .add(*Dst)
3188 .add(*Src1)
3189 .addImm(Imm)
3190 .add(*Src2);
3191 updateLiveVariables(LV, MI, *MIB);
3192 return MIB;
3193 }
3194 }
3195 }
3196
3197 unsigned NewOpc = IsFMA ? (IsF16 ? AMDGPU::V_FMA_F16_e64
3198 : IsF64 ? AMDGPU::V_FMA_F64_e64
3199 : AMDGPU::V_FMA_F32_e64)
3200 : (IsF16 ? AMDGPU::V_MAD_F16_e64 : AMDGPU::V_MAD_F32_e64);
3201 if (pseudoToMCOpcode(NewOpc) == -1)
3202 return nullptr;
3203
3204 MIB = BuildMI(*MBB, MI, MI.getDebugLoc(), get(NewOpc))
3205 .add(*Dst)
3206 .addImm(Src0Mods ? Src0Mods->getImm() : 0)
3207 .add(*Src0)
3208 .addImm(Src1Mods ? Src1Mods->getImm() : 0)
3209 .add(*Src1)
3210 .addImm(0) // Src mods
3211 .add(*Src2)
3212 .addImm(Clamp ? Clamp->getImm() : 0)
3213 .addImm(Omod ? Omod->getImm() : 0);
3214 updateLiveVariables(LV, MI, *MIB);
3215 return MIB;
3216}
3217
3218// It's not generally safe to move VALU instructions across these since it will
3219// start using the register as a base index rather than directly.
3220// XXX - Why isn't hasSideEffects sufficient for these?
3221static bool changesVGPRIndexingMode(const MachineInstr &MI) {
3222 switch (MI.getOpcode()) {
3223 case AMDGPU::S_SET_GPR_IDX_ON:
3224 case AMDGPU::S_SET_GPR_IDX_MODE:
3225 case AMDGPU::S_SET_GPR_IDX_OFF:
3226 return true;
3227 default:
3228 return false;
3229 }
3230}
3231
3232bool SIInstrInfo::isSchedulingBoundary(const MachineInstr &MI,
3233 const MachineBasicBlock *MBB,
3234 const MachineFunction &MF) const {
3235 // Skipping the check for SP writes in the base implementation. The reason it
3236 // was added was apparently due to compile time concerns.
3237 //
3238 // TODO: Do we really want this barrier? It triggers unnecessary hazard nops
3239 // but is probably avoidable.
3240
3241 // Copied from base implementation.
3242 // Terminators and labels can't be scheduled around.
3243 if (MI.isTerminator() || MI.isPosition())
3244 return true;
3245
3246 // INLINEASM_BR can jump to another block
3247 if (MI.getOpcode() == TargetOpcode::INLINEASM_BR)
3248 return true;
3249
3250 // Target-independent instructions do not have an implicit-use of EXEC, even
3251 // when they operate on VGPRs. Treating EXEC modifications as scheduling
3252 // boundaries prevents incorrect movements of such instructions.
3253 return MI.modifiesRegister(AMDGPU::EXEC, &RI) ||
3254 MI.getOpcode() == AMDGPU::S_SETREG_IMM32_B32 ||
3255 MI.getOpcode() == AMDGPU::S_SETREG_B32 ||
3256 changesVGPRIndexingMode(MI);
3257}
3258
3259bool SIInstrInfo::isAlwaysGDS(uint16_t Opcode) const {
3260 return Opcode == AMDGPU::DS_ORDERED_COUNT ||
3261 Opcode == AMDGPU::DS_GWS_INIT ||
3262 Opcode == AMDGPU::DS_GWS_SEMA_V ||
3263 Opcode == AMDGPU::DS_GWS_SEMA_BR ||
3264 Opcode == AMDGPU::DS_GWS_SEMA_P ||
3265 Opcode == AMDGPU::DS_GWS_SEMA_RELEASE_ALL ||
3266 Opcode == AMDGPU::DS_GWS_BARRIER;
3267}
3268
3269bool SIInstrInfo::modifiesModeRegister(const MachineInstr &MI) {
3270 // Skip the full operand and register alias search modifiesRegister
3271 // does. There's only a handful of instructions that touch this, it's only an
3272 // implicit def, and doesn't alias any other registers.
3273 if (const MCPhysReg *ImpDef = MI.getDesc().getImplicitDefs()) {
3274 for (; ImpDef && *ImpDef; ++ImpDef) {
3275 if (*ImpDef == AMDGPU::MODE)
3276 return true;
3277 }
3278 }
3279
3280 return false;
3281}
3282
3283bool SIInstrInfo::hasUnwantedEffectsWhenEXECEmpty(const MachineInstr &MI) const {
3284 unsigned Opcode = MI.getOpcode();
3285
3286 if (MI.mayStore() && isSMRD(MI))
3287 return true; // scalar store or atomic
3288
3289 // This will terminate the function when other lanes may need to continue.
3290 if (MI.isReturn())
3291 return true;
3292
3293 // These instructions cause shader I/O that may cause hardware lockups
3294 // when executed with an empty EXEC mask.
3295 //
3296 // Note: exp with VM = DONE = 0 is automatically skipped by hardware when
3297 // EXEC = 0, but checking for that case here seems not worth it
3298 // given the typical code patterns.
3299 if (Opcode == AMDGPU::S_SENDMSG || Opcode == AMDGPU::S_SENDMSGHALT ||
3300 isEXP(Opcode) ||
3301 Opcode == AMDGPU::DS_ORDERED_COUNT || Opcode == AMDGPU::S_TRAP ||
3302 Opcode == AMDGPU::DS_GWS_INIT || Opcode == AMDGPU::DS_GWS_BARRIER)
3303 return true;
3304
3305 if (MI.isCall() || MI.isInlineAsm())
3306 return true; // conservative assumption
3307
3308 // A mode change is a scalar operation that influences vector instructions.
3309 if (modifiesModeRegister(MI))
3310 return true;
3311
3312 // These are like SALU instructions in terms of effects, so it's questionable
3313 // whether we should return true for those.
3314 //
3315 // However, executing them with EXEC = 0 causes them to operate on undefined
3316 // data, which we avoid by returning true here.
3317 if (Opcode == AMDGPU::V_READFIRSTLANE_B32 ||
3318 Opcode == AMDGPU::V_READLANE_B32 || Opcode == AMDGPU::V_WRITELANE_B32)
3319 return true;
3320
3321 return false;
3322}
3323
3324bool SIInstrInfo::mayReadEXEC(const MachineRegisterInfo &MRI,
3325 const MachineInstr &MI) const {
3326 if (MI.isMetaInstruction())
3327 return false;
3328
3329 // This won't read exec if this is an SGPR->SGPR copy.
3330 if (MI.isCopyLike()) {
3331 if (!RI.isSGPRReg(MRI, MI.getOperand(0).getReg()))
3332 return true;
3333
3334 // Make sure this isn't copying exec as a normal operand
3335 return MI.readsRegister(AMDGPU::EXEC, &RI);
3336 }
3337
3338 // Make a conservative assumption about the callee.
3339 if (MI.isCall())
3340 return true;
3341
3342 // Be conservative with any unhandled generic opcodes.
3343 if (!isTargetSpecificOpcode(MI.getOpcode()))
3344 return true;
3345
3346 return !isSALU(MI) || MI.readsRegister(AMDGPU::EXEC, &RI);
3347}
3348
3349bool SIInstrInfo::isInlineConstant(const APInt &Imm) const {
3350 switch (Imm.getBitWidth()) {
3351 case 1: // This likely will be a condition code mask.
3352 return true;
3353
3354 case 32:
3355 return AMDGPU::isInlinableLiteral32(Imm.getSExtValue(),
3356 ST.hasInv2PiInlineImm());
3357 case 64:
3358 return AMDGPU::isInlinableLiteral64(Imm.getSExtValue(),
3359 ST.hasInv2PiInlineImm());
3360 case 16:
3361 return ST.has16BitInsts() &&
3362 AMDGPU::isInlinableLiteral16(Imm.getSExtValue(),
3363 ST.hasInv2PiInlineImm());
3364 default:
3365 llvm_unreachable("invalid bitwidth")__builtin_unreachable();
3366 }
3367}
3368
3369bool SIInstrInfo::isInlineConstant(const MachineOperand &MO,
3370 uint8_t OperandType) const {
3371 if (!MO.isImm() ||
3372 OperandType < AMDGPU::OPERAND_SRC_FIRST ||
3373 OperandType > AMDGPU::OPERAND_SRC_LAST)
3374 return false;
3375
3376 // MachineOperand provides no way to tell the true operand size, since it only
3377 // records a 64-bit value. We need to know the size to determine if a 32-bit
3378 // floating point immediate bit pattern is legal for an integer immediate. It
3379 // would be for any 32-bit integer operand, but would not be for a 64-bit one.
3380
3381 int64_t Imm = MO.getImm();
3382 switch (OperandType) {
3383 case AMDGPU::OPERAND_REG_IMM_INT32:
3384 case AMDGPU::OPERAND_REG_IMM_FP32:
3385 case AMDGPU::OPERAND_REG_INLINE_C_INT32:
3386 case AMDGPU::OPERAND_REG_INLINE_C_FP32:
3387 case AMDGPU::OPERAND_REG_IMM_V2FP32:
3388 case AMDGPU::OPERAND_REG_INLINE_C_V2FP32:
3389 case AMDGPU::OPERAND_REG_IMM_V2INT32:
3390 case AMDGPU::OPERAND_REG_INLINE_C_V2INT32:
3391 case AMDGPU::OPERAND_REG_INLINE_AC_INT32:
3392 case AMDGPU::OPERAND_REG_INLINE_AC_FP32: {
3393 int32_t Trunc = static_cast<int32_t>(Imm);
3394 return AMDGPU::isInlinableLiteral32(Trunc, ST.hasInv2PiInlineImm());
3395 }
3396 case AMDGPU::OPERAND_REG_IMM_INT64:
3397 case AMDGPU::OPERAND_REG_IMM_FP64:
3398 case AMDGPU::OPERAND_REG_INLINE_C_INT64:
3399 case AMDGPU::OPERAND_REG_INLINE_C_FP64:
3400 case AMDGPU::OPERAND_REG_INLINE_AC_FP64:
3401 return AMDGPU::isInlinableLiteral64(MO.getImm(),
3402 ST.hasInv2PiInlineImm());
3403 case AMDGPU::OPERAND_REG_IMM_INT16:
3404 case AMDGPU::OPERAND_REG_INLINE_C_INT16:
3405 case AMDGPU::OPERAND_REG_INLINE_AC_INT16:
3406 // We would expect inline immediates to not be concerned with an integer/fp
3407 // distinction. However, in the case of 16-bit integer operations, the
3408 // "floating point" values appear to not work. It seems read the low 16-bits
3409 // of 32-bit immediates, which happens to always work for the integer
3410 // values.
3411 //
3412 // See llvm bugzilla 46302.
3413 //
3414 // TODO: Theoretically we could use op-sel to use the high bits of the
3415 // 32-bit FP values.
3416 return AMDGPU::isInlinableIntLiteral(Imm);
3417 case AMDGPU::OPERAND_REG_IMM_V2INT16:
3418 case AMDGPU::OPERAND_REG_INLINE_C_V2INT16:
3419 case AMDGPU::OPERAND_REG_INLINE_AC_V2INT16:
3420 // This suffers the same problem as the scalar 16-bit cases.
3421 return AMDGPU::isInlinableIntLiteralV216(Imm);
3422 case AMDGPU::OPERAND_REG_IMM_FP16:
3423 case AMDGPU::OPERAND_REG_INLINE_C_FP16:
3424 case AMDGPU::OPERAND_REG_INLINE_AC_FP16: {
3425 if (isInt<16>(Imm) || isUInt<16>(Imm)) {
3426 // A few special case instructions have 16-bit operands on subtargets
3427 // where 16-bit instructions are not legal.
3428 // TODO: Do the 32-bit immediates work? We shouldn't really need to handle
3429 // constants in these cases
3430 int16_t Trunc = static_cast<int16_t>(Imm);
3431 return ST.has16BitInsts() &&
3432 AMDGPU::isInlinableLiteral16(Trunc, ST.hasInv2PiInlineImm());
3433 }
3434
3435 return false;
3436 }
3437 case AMDGPU::OPERAND_REG_IMM_V2FP16:
3438 case AMDGPU::OPERAND_REG_INLINE_C_V2FP16:
3439 case AMDGPU::OPERAND_REG_INLINE_AC_V2FP16: {
3440 uint32_t Trunc = static_cast<uint32_t>(Imm);
3441 return AMDGPU::isInlinableLiteralV216(Trunc, ST.hasInv2PiInlineImm());
3442 }
3443 default:
3444 llvm_unreachable("invalid bitwidth")__builtin_unreachable();
3445 }
3446}
3447
3448bool SIInstrInfo::isLiteralConstantLike(const MachineOperand &MO,
3449 const MCOperandInfo &OpInfo) const {
3450 switch (MO.getType()) {
3451 case MachineOperand::MO_Register:
3452 return false;
3453 case MachineOperand::MO_Immediate:
3454 return !isInlineConstant(MO, OpInfo);
3455 case MachineOperand::MO_FrameIndex:
3456 case MachineOperand::MO_MachineBasicBlock:
3457 case MachineOperand::MO_ExternalSymbol:
3458 case MachineOperand::MO_GlobalAddress:
3459 case MachineOperand::MO_MCSymbol:
3460 return true;
3461 default:
3462 llvm_unreachable("unexpected operand type")__builtin_unreachable();
3463 }
3464}
3465
3466static bool compareMachineOp(const MachineOperand &Op0,
3467 const MachineOperand &Op1) {
3468 if (Op0.getType() != Op1.getType())
3469 return false;
3470
3471 switch (Op0.getType()) {
3472 case MachineOperand::MO_Register:
3473 return Op0.getReg() == Op1.getReg();
3474 case MachineOperand::MO_Immediate:
3475 return Op0.getImm() == Op1.getImm();
3476 default:
3477 llvm_unreachable("Didn't expect to be comparing these operand types")__builtin_unreachable();
3478 }
3479}
3480
3481bool SIInstrInfo::isImmOperandLegal(const MachineInstr &MI, unsigned OpNo,
3482 const MachineOperand &MO) const {
3483 const MCInstrDesc &InstDesc = MI.getDesc();
3484 const MCOperandInfo &OpInfo = InstDesc.OpInfo[OpNo];
3485
3486 assert(MO.isImm() || MO.isTargetIndex() || MO.isFI() || MO.isGlobal())((void)0);
3487
3488 if (OpInfo.OperandType == MCOI::OPERAND_IMMEDIATE)
3489 return true;
3490
3491 if (OpInfo.RegClass < 0)
3492 return false;
3493
3494 if (MO.isImm() && isInlineConstant(MO, OpInfo)) {
3495 if (isMAI(MI) && ST.hasMFMAInlineLiteralBug() &&
3496 OpNo ==(unsigned)AMDGPU::getNamedOperandIdx(MI.getOpcode(),
3497 AMDGPU::OpName::src2))
3498 return false;
3499 return RI.opCanUseInlineConstant(OpInfo.OperandType);
3500 }
3501
3502 if (!RI.opCanUseLiteralConstant(OpInfo.OperandType))
3503 return false;
3504
3505 if (!isVOP3(MI) || !AMDGPU::isSISrcOperand(InstDesc, OpNo))
3506 return true;
3507
3508 return ST.hasVOP3Literal();
3509}
3510
3511bool SIInstrInfo::hasVALU32BitEncoding(unsigned Opcode) const {
3512 // GFX90A does not have V_MUL_LEGACY_F32_e32.
3513 if (Opcode == AMDGPU::V_MUL_LEGACY_F32_e64 && ST.hasGFX90AInsts())
3514 return false;
3515
3516 int Op32 = AMDGPU::getVOPe32(Opcode);
3517 if (Op32 == -1)
3518 return false;
3519
3520 return pseudoToMCOpcode(Op32) != -1;
3521}
3522
3523bool SIInstrInfo::hasModifiers(unsigned Opcode) const {
3524 // The src0_modifier operand is present on all instructions
3525 // that have modifiers.
3526
3527 return AMDGPU::getNamedOperandIdx(Opcode,
3528 AMDGPU::OpName::src0_modifiers) != -1;
3529}
3530
3531bool SIInstrInfo::hasModifiersSet(const MachineInstr &MI,
3532 unsigned OpName) const {
3533 const MachineOperand *Mods = getNamedOperand(MI, OpName);
3534 return Mods && Mods->getImm();
3535}
3536
3537bool SIInstrInfo::hasAnyModifiersSet(const MachineInstr &MI) const {
3538 return hasModifiersSet(MI, AMDGPU::OpName::src0_modifiers) ||
3539 hasModifiersSet(MI, AMDGPU::OpName::src1_modifiers) ||
3540 hasModifiersSet(MI, AMDGPU::OpName::src2_modifiers) ||
3541 hasModifiersSet(MI, AMDGPU::OpName::clamp) ||
3542 hasModifiersSet(MI, AMDGPU::OpName::omod);
3543}
3544
3545bool SIInstrInfo::canShrink(const MachineInstr &MI,
3546 const MachineRegisterInfo &MRI) const {
3547 const MachineOperand *Src2 = getNamedOperand(MI, AMDGPU::OpName::src2);
3548 // Can't shrink instruction with three operands.
3549 // FIXME: v_cndmask_b32 has 3 operands and is shrinkable, but we need to add
3550 // a special case for it. It can only be shrunk if the third operand
3551 // is vcc, and src0_modifiers and src1_modifiers are not set.
3552 // We should handle this the same way we handle vopc, by addding
3553 // a register allocation hint pre-regalloc and then do the shrinking
3554 // post-regalloc.
3555 if (Src2) {
3556 switch (MI.getOpcode()) {
3557 default: return false;
3558
3559 case AMDGPU::V_ADDC_U32_e64:
3560 case AMDGPU::V_SUBB_U32_e64:
3561 case AMDGPU::V_SUBBREV_U32_e64: {
3562 const MachineOperand *Src1
3563 = getNamedOperand(MI, AMDGPU::OpName::src1);
3564 if (!Src1->isReg() || !RI.isVGPR(MRI, Src1->getReg()))
3565 return false;
3566 // Additional verification is needed for sdst/src2.
3567 return true;
3568 }
3569 case AMDGPU::V_MAC_F32_e64:
3570 case AMDGPU::V_MAC_F16_e64:
3571 case AMDGPU::V_FMAC_F32_e64:
3572 case AMDGPU::V_FMAC_F16_e64:
3573 case AMDGPU::V_FMAC_F64_e64:
3574 if (!Src2->isReg() || !RI.isVGPR(MRI, Src2->getReg()) ||
3575 hasModifiersSet(MI, AMDGPU::OpName::src2_modifiers))
3576 return false;
3577 break;
3578
3579 case AMDGPU::V_CNDMASK_B32_e64:
3580 break;
3581 }
3582 }
3583
3584 const MachineOperand *Src1 = getNamedOperand(MI, AMDGPU::OpName::src1);
3585 if (Src1 && (!Src1->isReg() || !RI.isVGPR(MRI, Src1->getReg()) ||
3586 hasModifiersSet(MI, AMDGPU::OpName::src1_modifiers)))
3587 return false;
3588
3589 // We don't need to check src0, all input types are legal, so just make sure
3590 // src0 isn't using any modifiers.
3591 if (hasModifiersSet(MI, AMDGPU::OpName::src0_modifiers))
3592 return false;
3593
3594 // Can it be shrunk to a valid 32 bit opcode?
3595 if (!hasVALU32BitEncoding(MI.getOpcode()))
3596 return false;
3597
3598 // Check output modifiers
3599 return !hasModifiersSet(MI, AMDGPU::OpName::omod) &&
3600 !hasModifiersSet(MI, AMDGPU::OpName::clamp);
3601}
3602
3603// Set VCC operand with all flags from \p Orig, except for setting it as
3604// implicit.
3605static void copyFlagsToImplicitVCC(MachineInstr &MI,
3606 const MachineOperand &Orig) {
3607
3608 for (MachineOperand &Use : MI.implicit_operands()) {
3609 if (Use.isUse() &&
3610 (Use.getReg() == AMDGPU::VCC || Use.getReg() == AMDGPU::VCC_LO)) {
3611 Use.setIsUndef(Orig.isUndef());
3612 Use.setIsKill(Orig.isKill());
3613 return;
3614 }
3615 }
3616}
3617
3618MachineInstr *SIInstrInfo::buildShrunkInst(MachineInstr &MI,
3619 unsigned Op32) const {
3620 MachineBasicBlock *MBB = MI.getParent();;
3621 MachineInstrBuilder Inst32 =
3622 BuildMI(*MBB, MI, MI.getDebugLoc(), get(Op32))
3623 .setMIFlags(MI.getFlags());
3624
3625 // Add the dst operand if the 32-bit encoding also has an explicit $vdst.
3626 // For VOPC instructions, this is replaced by an implicit def of vcc.
3627 int Op32DstIdx = AMDGPU::getNamedOperandIdx(Op32, AMDGPU::OpName::vdst);
3628 if (Op32DstIdx != -1) {
3629 // dst
3630 Inst32.add(MI.getOperand(0));
3631 } else {
3632 assert(((MI.getOperand(0).getReg() == AMDGPU::VCC) ||((void)0)
3633 (MI.getOperand(0).getReg() == AMDGPU::VCC_LO)) &&((void)0)
3634 "Unexpected case")((void)0);
3635 }
3636
3637 Inst32.add(*getNamedOperand(MI, AMDGPU::OpName::src0));
3638
3639 const MachineOperand *Src1 = getNamedOperand(MI, AMDGPU::OpName::src1);
3640 if (Src1)
3641 Inst32.add(*Src1);
3642
3643 const MachineOperand *Src2 = getNamedOperand(MI, AMDGPU::OpName::src2);
3644
3645 if (Src2) {
3646 int Op32Src2Idx = AMDGPU::getNamedOperandIdx(Op32, AMDGPU::OpName::src2);
3647 if (Op32Src2Idx != -1) {
3648 Inst32.add(*Src2);
3649 } else {
3650 // In the case of V_CNDMASK_B32_e32, the explicit operand src2 is
3651 // replaced with an implicit read of vcc or vcc_lo. The implicit read
3652 // of vcc was already added during the initial BuildMI, but we
3653 // 1) may need to change vcc to vcc_lo to preserve the original register
3654 // 2) have to preserve the original flags.
3655 fixImplicitOperands(*Inst32);
3656 copyFlagsToImplicitVCC(*Inst32, *Src2);
3657 }
3658 }
3659
3660 return Inst32;
3661}
3662
3663bool SIInstrInfo::usesConstantBus(const MachineRegisterInfo &MRI,
3664 const MachineOperand &MO,
3665 const MCOperandInfo &OpInfo) const {
3666 // Literal constants use the constant bus.
3667 //if (isLiteralConstantLike(MO, OpInfo))
3668 // return true;
3669 if (MO.isImm())
3670 return !isInlineConstant(MO, OpInfo);
3671
3672 if (!MO.isReg())
3673 return true; // Misc other operands like FrameIndex
3674
3675 if (!MO.isUse())
3676 return false;
3677
3678 if (MO.getReg().isVirtual())
3679 return RI.isSGPRClass(MRI.getRegClass(MO.getReg()));
3680
3681 // Null is free
3682 if (MO.getReg() == AMDGPU::SGPR_NULL)
3683 return false;
3684
3685 // SGPRs use the constant bus
3686 if (MO.isImplicit()) {
3687 return MO.getReg() == AMDGPU::M0 ||
3688 MO.getReg() == AMDGPU::VCC ||
3689 MO.getReg() == AMDGPU::VCC_LO;
3690 } else {
3691 return AMDGPU::SReg_32RegClass.contains(MO.getReg()) ||
3692 AMDGPU::SReg_64RegClass.contains(MO.getReg());
3693 }
3694}
3695
3696static Register findImplicitSGPRRead(const MachineInstr &MI) {
3697 for (const MachineOperand &MO : MI.implicit_operands()) {
3698 // We only care about reads.
3699 if (MO.isDef())
3700 continue;
3701
3702 switch (MO.getReg()) {
3703 case AMDGPU::VCC:
3704 case AMDGPU::VCC_LO:
3705 case AMDGPU::VCC_HI:
3706 case AMDGPU::M0:
3707 case AMDGPU::FLAT_SCR:
3708 return MO.getReg();
3709
3710 default:
3711 break;
3712 }
3713 }
3714
3715 return AMDGPU::NoRegister;
3716}
3717
3718static bool shouldReadExec(const MachineInstr &MI) {
3719 if (SIInstrInfo::isVALU(MI)) {
3720 switch (MI.getOpcode()) {
3721 case AMDGPU::V_READLANE_B32:
3722 case AMDGPU::V_WRITELANE_B32:
3723 return false;
3724 }
3725
3726 return true;
3727 }
3728
3729 if (MI.isPreISelOpcode() ||
3730 SIInstrInfo::isGenericOpcode(MI.getOpcode()) ||
3731 SIInstrInfo::isSALU(MI) ||
3732 SIInstrInfo::isSMRD(MI))
3733 return false;
3734
3735 return true;
3736}
3737
3738static bool isSubRegOf(const SIRegisterInfo &TRI,
3739 const MachineOperand &SuperVec,
3740 const MachineOperand &SubReg) {
3741 if (SubReg.getReg().isPhysical())
3742 return TRI.isSubRegister(SuperVec.getReg(), SubReg.getReg());
3743
3744 return SubReg.getSubReg() != AMDGPU::NoSubRegister &&
3745 SubReg.getReg() == SuperVec.getReg();
3746}
3747
3748bool SIInstrInfo::verifyInstruction(const MachineInstr &MI,
3749 StringRef &ErrInfo) const {
3750 uint16_t Opcode = MI.getOpcode();
3751 if (SIInstrInfo::isGenericOpcode(MI.getOpcode()))
3752 return true;
3753
3754 const MachineFunction *MF = MI.getParent()->getParent();
3755 const MachineRegisterInfo &MRI = MF->getRegInfo();
3756
3757 int Src0Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src0);
3758 int Src1Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src1);
3759 int Src2Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src2);
3760
3761 // Make sure the number of operands is correct.
3762 const MCInstrDesc &Desc = get(Opcode);
3763 if (!Desc.isVariadic() &&
3764 Desc.getNumOperands() != MI.getNumExplicitOperands()) {
3765 ErrInfo = "Instruction has wrong number of operands.";
3766 return false;
3767 }
3768
3769 if (MI.isInlineAsm()) {
3770 // Verify register classes for inlineasm constraints.
3771 for (unsigned I = InlineAsm::MIOp_FirstOperand, E = MI.getNumOperands();
3772 I != E; ++I) {
3773 const TargetRegisterClass *RC = MI.getRegClassConstraint(I, this, &RI);
3774 if (!RC)
3775 continue;
3776
3777 const MachineOperand &Op = MI.getOperand(I);
3778 if (!Op.isReg())
3779 continue;
3780
3781 Register Reg = Op.getReg();
3782 if (!Reg.isVirtual() && !RC->contains(Reg)) {
3783 ErrInfo = "inlineasm operand has incorrect register class.";
3784 return false;
3785 }
3786 }
3787
3788 return true;
3789 }
3790
3791 if (isMIMG(MI) && MI.memoperands_empty() && MI.mayLoadOrStore()) {
3792 ErrInfo = "missing memory operand from MIMG instruction.";
3793 return false;
3794 }
3795
3796 // Make sure the register classes are correct.
3797 for (int i = 0, e = Desc.getNumOperands(); i != e; ++i) {
3798 const MachineOperand &MO = MI.getOperand(i);
3799 if (MO.isFPImm()) {
3800 ErrInfo = "FPImm Machine Operands are not supported. ISel should bitcast "
3801 "all fp values to integers.";
3802 return false;
3803 }
3804
3805 int RegClass = Desc.OpInfo[i].RegClass;
3806
3807 switch (Desc.OpInfo[i].OperandType) {
3808 case MCOI::OPERAND_REGISTER:
3809 if (MI.getOperand(i).isImm() || MI.getOperand(i).isGlobal()) {
3810 ErrInfo = "Illegal immediate value for operand.";
3811 return false;
3812 }
3813 break;
3814 case AMDGPU::OPERAND_REG_IMM_INT32:
3815 case AMDGPU::OPERAND_REG_IMM_FP32:
3816 break;
3817 case AMDGPU::OPERAND_REG_INLINE_C_INT32:
3818 case AMDGPU::OPERAND_REG_INLINE_C_FP32:
3819 case AMDGPU::OPERAND_REG_INLINE_C_INT64:
3820 case AMDGPU::OPERAND_REG_INLINE_C_FP64:
3821 case AMDGPU::OPERAND_REG_INLINE_C_INT16:
3822 case AMDGPU::OPERAND_REG_INLINE_C_FP16:
3823 case AMDGPU::OPERAND_REG_INLINE_AC_INT32:
3824 case AMDGPU::OPERAND_REG_INLINE_AC_FP32:
3825 case AMDGPU::OPERAND_REG_INLINE_AC_INT16:
3826 case AMDGPU::OPERAND_REG_INLINE_AC_FP16:
3827 case AMDGPU::OPERAND_REG_INLINE_AC_FP64: {
3828 if (!MO.isReg() && (!MO.isImm() || !isInlineConstant(MI, i))) {
3829 ErrInfo = "Illegal immediate value for operand.";
3830 return false;
3831 }
3832 break;
3833 }
3834 case MCOI::OPERAND_IMMEDIATE:
3835 case AMDGPU::OPERAND_KIMM32:
3836 // Check if this operand is an immediate.
3837 // FrameIndex operands will be replaced by immediates, so they are
3838 // allowed.
3839 if (!MI.getOperand(i).isImm() && !MI.getOperand(i).isFI()) {
3840 ErrInfo = "Expected immediate, but got non-immediate";
3841 return false;
3842 }
3843 LLVM_FALLTHROUGH[[gnu::fallthrough]];
3844 default:
3845 continue;
3846 }
3847
3848 if (!MO.isReg())
3849 continue;
3850 Register Reg = MO.getReg();
3851 if (!Reg)
3852 continue;
3853
3854 // FIXME: Ideally we would have separate instruction definitions with the
3855 // aligned register constraint.
3856 // FIXME: We do not verify inline asm operands, but custom inline asm
3857 // verification is broken anyway
3858 if (ST.needsAlignedVGPRs()) {
3859 const TargetRegisterClass *RC = RI.getRegClassForReg(MRI, Reg);
3860 const bool IsVGPR = RI.hasVGPRs(RC);
3861 const bool IsAGPR = !IsVGPR && RI.hasAGPRs(RC);
3862 if ((IsVGPR || IsAGPR) && MO.getSubReg()) {
3863 const TargetRegisterClass *SubRC =
3864 RI.getSubRegClass(RC, MO.getSubReg());
3865 RC = RI.getCompatibleSubRegClass(RC, SubRC, MO.getSubReg());
3866 if (RC)
3867 RC = SubRC;
3868 }
3869
3870 // Check that this is the aligned version of the class.
3871 if (!RC || !RI.isProperlyAlignedRC(*RC)) {
3872 ErrInfo = "Subtarget requires even aligned vector registers";
3873 return false;
3874 }
3875 }
3876
3877 if (RegClass != -1) {
3878 if (Reg.isVirtual())
3879 continue;
3880
3881 const TargetRegisterClass *RC = RI.getRegClass(RegClass);
3882 if (!RC->contains(Reg)) {
3883 ErrInfo = "Operand has incorrect register class.";
3884 return false;
3885 }
3886 }
3887 }
3888
3889 // Verify SDWA
3890 if (isSDWA(MI)) {
3891 if (!ST.hasSDWA()) {
3892 ErrInfo = "SDWA is not supported on this target";
3893 return false;
3894 }
3895
3896 int DstIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::vdst);
3897
3898 const int OpIndicies[] = { DstIdx, Src0Idx, Src1Idx, Src2Idx };
3899
3900 for (int OpIdx: OpIndicies) {
3901 if (OpIdx == -1)
3902 continue;
3903 const MachineOperand &MO = MI.getOperand(OpIdx);
3904
3905 if (!ST.hasSDWAScalar()) {
3906 // Only VGPRS on VI
3907 if (!MO.isReg() || !RI.hasVGPRs(RI.getRegClassForReg(MRI, MO.getReg()))) {
3908 ErrInfo = "Only VGPRs allowed as operands in SDWA instructions on VI";
3909 return false;
3910 }
3911 } else {
3912 // No immediates on GFX9
3913 if (!MO.isReg()) {
3914 ErrInfo =
3915 "Only reg allowed as operands in SDWA instructions on GFX9+";
3916 return false;
3917 }
3918 }
3919 }
3920
3921 if (!ST.hasSDWAOmod()) {
3922 // No omod allowed on VI
3923 const MachineOperand *OMod = getNamedOperand(MI, AMDGPU::OpName::omod);
3924 if (OMod != nullptr &&
3925 (!OMod->isImm() || OMod->getImm() != 0)) {
3926 ErrInfo = "OMod not allowed in SDWA instructions on VI";
3927 return false;
3928 }
3929 }
3930
3931 uint16_t BasicOpcode = AMDGPU::getBasicFromSDWAOp(Opcode);
3932 if (isVOPC(BasicOpcode)) {
3933 if (!ST.hasSDWASdst() && DstIdx != -1) {
3934 // Only vcc allowed as dst on VI for VOPC
3935 const MachineOperand &Dst = MI.getOperand(DstIdx);
3936 if (!Dst.isReg() || Dst.getReg() != AMDGPU::VCC) {
3937 ErrInfo = "Only VCC allowed as dst in SDWA instructions on VI";
3938 return false;
3939 }
3940 } else if (!ST.hasSDWAOutModsVOPC()) {
3941 // No clamp allowed on GFX9 for VOPC
3942 const MachineOperand *Clamp = getNamedOperand(MI, AMDGPU::OpName::clamp);
3943 if (Clamp && (!Clamp->isImm() || Clamp->getImm() != 0)) {
3944 ErrInfo = "Clamp not allowed in VOPC SDWA instructions on VI";
3945 return false;
3946 }
3947
3948 // No omod allowed on GFX9 for VOPC
3949 const MachineOperand *OMod = getNamedOperand(MI, AMDGPU::OpName::omod);
3950 if (OMod && (!OMod->isImm() || OMod->getImm() != 0)) {
3951 ErrInfo = "OMod not allowed in VOPC SDWA instructions on VI";
3952 return false;
3953 }
3954 }
3955 }
3956
3957 const MachineOperand *DstUnused = getNamedOperand(MI, AMDGPU::OpName::dst_unused);
3958 if (DstUnused && DstUnused->isImm() &&
3959 DstUnused->getImm() == AMDGPU::SDWA::UNUSED_PRESERVE) {
3960 const MachineOperand &Dst = MI.getOperand(DstIdx);
3961 if (!Dst.isReg() || !Dst.isTied()) {
3962 ErrInfo = "Dst register should have tied register";
3963 return false;
3964 }
3965
3966 const MachineOperand &TiedMO =
3967 MI.getOperand(MI.findTiedOperandIdx(DstIdx));
3968 if (!TiedMO.isReg() || !TiedMO.isImplicit() || !TiedMO.isUse()) {
3969 ErrInfo =
3970 "Dst register should be tied to implicit use of preserved register";
3971 return false;
3972 } else if (TiedMO.getReg().isPhysical() &&
3973 Dst.getReg() != TiedMO.getReg()) {
3974 ErrInfo = "Dst register should use same physical register as preserved";
3975 return false;
3976 }
3977 }
3978 }
3979
3980 // Verify MIMG
3981 if (isMIMG(MI.getOpcode()) && !MI.mayStore()) {
3982 // Ensure that the return type used is large enough for all the options
3983 // being used TFE/LWE require an extra result register.
3984 const MachineOperand *DMask = getNamedOperand(MI, AMDGPU::OpName::dmask);
3985 if (DMask) {
3986 uint64_t DMaskImm = DMask->getImm();
3987 uint32_t RegCount =
3988 isGather4(MI.getOpcode()) ? 4 : countPopulation(DMaskImm);
3989 const MachineOperand *TFE = getNamedOperand(MI, AMDGPU::OpName::tfe);
3990 const MachineOperand *LWE = getNamedOperand(MI, AMDGPU::OpName::lwe);
3991 const MachineOperand *D16 = getNamedOperand(MI, AMDGPU::OpName::d16);
3992
3993 // Adjust for packed 16 bit values
3994 if (D16 && D16->getImm() && !ST.hasUnpackedD16VMem())
3995 RegCount >>= 1;
3996
3997 // Adjust if using LWE or TFE
3998 if ((LWE && LWE->getImm()) || (TFE && TFE->getImm()))
3999 RegCount += 1;
4000
4001 const uint32_t DstIdx =
4002 AMDGPU::getNamedOperandIdx(MI.getOpcode(), AMDGPU::OpName::vdata);
4003 const MachineOperand &Dst = MI.getOperand(DstIdx);
4004 if (Dst.isReg()) {
4005 const TargetRegisterClass *DstRC = getOpRegClass(MI, DstIdx);
4006 uint32_t DstSize = RI.getRegSizeInBits(*DstRC) / 32;
4007 if (RegCount > DstSize) {
4008 ErrInfo = "MIMG instruction returns too many registers for dst "
4009 "register class";
4010 return false;
4011 }
4012 }
4013 }
4014 }
4015
4016 // Verify VOP*. Ignore multiple sgpr operands on writelane.
4017 if (Desc.getOpcode() != AMDGPU::V_WRITELANE_B32
4018 && (isVOP1(MI) || isVOP2(MI) || isVOP3(MI) || isVOPC(MI) || isSDWA(MI))) {
4019 // Only look at the true operands. Only a real operand can use the constant
4020 // bus, and we don't want to check pseudo-operands like the source modifier
4021 // flags.
4022 const int OpIndices[] = { Src0Idx, Src1Idx, Src2Idx };
4023
4024 unsigned ConstantBusCount = 0;
4025 bool UsesLiteral = false;
4026 const MachineOperand *LiteralVal = nullptr;
4027
4028 if (AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::imm) != -1)
4029 ++ConstantBusCount;
4030
4031 SmallVector<Register, 2> SGPRsUsed;
4032 Register SGPRUsed;
4033
4034 for (int OpIdx : OpIndices) {
4035 if (OpIdx == -1)
4036 break;
4037 const MachineOperand &MO = MI.getOperand(OpIdx);
4038 if (usesConstantBus(MRI, MO, MI.getDesc().OpInfo[OpIdx])) {
4039 if (MO.isReg()) {
4040 SGPRUsed = MO.getReg();
4041 if (llvm::all_of(SGPRsUsed, [SGPRUsed](unsigned SGPR) {
4042 return SGPRUsed != SGPR;
4043 })) {
4044 ++ConstantBusCount;
4045 SGPRsUsed.push_back(SGPRUsed);
4046 }
4047 } else {
4048 if (!UsesLiteral) {
4049 ++ConstantBusCount;
4050 UsesLiteral = true;
4051 LiteralVal = &MO;
4052 } else if (!MO.isIdenticalTo(*LiteralVal)) {
4053 assert(isVOP3(MI))((void)0);
4054 ErrInfo = "VOP3 instruction uses more than one literal";
4055 return false;
4056 }
4057 }
4058 }
4059 }
4060
4061 SGPRUsed = findImplicitSGPRRead(MI);
4062 if (SGPRUsed != AMDGPU::NoRegister) {
4063 // Implicit uses may safely overlap true overands
4064 if (llvm::all_of(SGPRsUsed, [this, SGPRUsed](unsigned SGPR) {
4065 return !RI.regsOverlap(SGPRUsed, SGPR);
4066 })) {
4067 ++ConstantBusCount;
4068 SGPRsUsed.push_back(SGPRUsed);
4069 }
4070 }
4071
4072 // v_writelane_b32 is an exception from constant bus restriction:
4073 // vsrc0 can be sgpr, const or m0 and lane select sgpr, m0 or inline-const
4074 if (ConstantBusCount > ST.getConstantBusLimit(Opcode) &&
4075 Opcode != AMDGPU::V_WRITELANE_B32) {
4076 ErrInfo = "VOP* instruction violates constant bus restriction";
4077 return false;
4078 }
4079
4080 if (isVOP3(MI) && UsesLiteral && !ST.hasVOP3Literal()) {
4081 ErrInfo = "VOP3 instruction uses literal";
4082 return false;
4083 }
4084 }
4085
4086 // Special case for writelane - this can break the multiple constant bus rule,
4087 // but still can't use more than one SGPR register
4088 if (Desc.getOpcode() == AMDGPU::V_WRITELANE_B32) {
4089 unsigned SGPRCount = 0;
4090 Register SGPRUsed = AMDGPU::NoRegister;
4091
4092 for (int OpIdx : {Src0Idx, Src1Idx, Src2Idx}) {
4093 if (OpIdx == -1)
4094 break;
4095
4096 const MachineOperand &MO = MI.getOperand(OpIdx);
4097
4098 if (usesConstantBus(MRI, MO, MI.getDesc().OpInfo[OpIdx])) {
4099 if (MO.isReg() && MO.getReg() != AMDGPU::M0) {
4100 if (MO.getReg() != SGPRUsed)
4101 ++SGPRCount;
4102 SGPRUsed = MO.getReg();
4103 }
4104 }
4105 if (SGPRCount > ST.getConstantBusLimit(Opcode)) {
4106 ErrInfo = "WRITELANE instruction violates constant bus restriction";
4107 return false;
4108 }
4109 }
4110 }
4111
4112 // Verify misc. restrictions on specific instructions.
4113 if (Desc.getOpcode() == AMDGPU::V_DIV_SCALE_F32_e64 ||
4114 Desc.getOpcode() == AMDGPU::V_DIV_SCALE_F64_e64) {
4115 const MachineOperand &Src0 = MI.getOperand(Src0Idx);
4116 const MachineOperand &Src1 = MI.getOperand(Src1Idx);
4117 const MachineOperand &Src2 = MI.getOperand(Src2Idx);
4118 if (Src0.isReg() && Src1.isReg() && Src2.isReg()) {
4119 if (!compareMachineOp(Src0, Src1) &&
4120 !compareMachineOp(Src0, Src2)) {
4121 ErrInfo = "v_div_scale_{f32|f64} require src0 = src1 or src2";
4122 return false;
4123 }
4124 }
4125 if ((getNamedOperand(MI, AMDGPU::OpName::src0_modifiers)->getImm() &
4126 SISrcMods::ABS) ||
4127 (getNamedOperand(MI, AMDGPU::OpName::src1_modifiers)->getImm() &
4128 SISrcMods::ABS) ||
4129 (getNamedOperand(MI, AMDGPU::OpName::src2_modifiers)->getImm() &
4130 SISrcMods::ABS)) {
4131 ErrInfo = "ABS not allowed in VOP3B instructions";
4132 return false;
4133 }
4134 }
4135
4136 if (isSOP2(MI) || isSOPC(MI)) {
4137 const MachineOperand &Src0 = MI.getOperand(Src0Idx);
4138 const MachineOperand &Src1 = MI.getOperand(Src1Idx);
4139 unsigned Immediates = 0;
4140
4141 if (!Src0.isReg() &&
4142 !isInlineConstant(Src0, Desc.OpInfo[Src0Idx].OperandType))
4143 Immediates++;
4144 if (!Src1.isReg() &&
4145 !isInlineConstant(Src1, Desc.OpInfo[Src1Idx].OperandType))
4146 Immediates++;
4147
4148 if (Immediates > 1) {
4149 ErrInfo = "SOP2/SOPC instruction requires too many immediate constants";
4150 return false;
4151 }
4152 }
4153
4154 if (isSOPK(MI)) {
4155 auto Op = getNamedOperand(MI, AMDGPU::OpName::simm16);
4156 if (Desc.isBranch()) {
4157 if (!Op->isMBB()) {
4158 ErrInfo = "invalid branch target for SOPK instruction";
4159 return false;
4160 }
4161 } else {
4162 uint64_t Imm = Op->getImm();
4163 if (sopkIsZext(MI)) {
4164 if (!isUInt<16>(Imm)) {
4165 ErrInfo = "invalid immediate for SOPK instruction";
4166 return false;
4167 }
4168 } else {
4169 if (!isInt<16>(Imm)) {
4170 ErrInfo = "invalid immediate for SOPK instruction";
4171 return false;
4172 }
4173 }
4174 }
4175 }
4176
4177 if (Desc.getOpcode() == AMDGPU::V_MOVRELS_B32_e32 ||
4178 Desc.getOpcode() == AMDGPU::V_MOVRELS_B32_e64 ||
4179 Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e32 ||
4180 Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e64) {
4181 const bool IsDst = Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e32 ||
4182 Desc.getOpcode() == AMDGPU::V_MOVRELD_B32_e64;
4183
4184 const unsigned StaticNumOps = Desc.getNumOperands() +
4185 Desc.getNumImplicitUses();
4186 const unsigned NumImplicitOps = IsDst ? 2 : 1;
4187
4188 // Allow additional implicit operands. This allows a fixup done by the post
4189 // RA scheduler where the main implicit operand is killed and implicit-defs
4190 // are added for sub-registers that remain live after this instruction.
4191 if (MI.getNumOperands() < StaticNumOps + NumImplicitOps) {
4192 ErrInfo = "missing implicit register operands";
4193 return false;
4194 }
4195
4196 const MachineOperand *Dst = getNamedOperand(MI, AMDGPU::OpName::vdst);
4197 if (IsDst) {
4198 if (!Dst->isUse()) {
4199 ErrInfo = "v_movreld_b32 vdst should be a use operand";
4200 return false;
4201 }
4202
4203 unsigned UseOpIdx;
4204 if (!MI.isRegTiedToUseOperand(StaticNumOps, &UseOpIdx) ||
4205 UseOpIdx != StaticNumOps + 1) {
4206 ErrInfo = "movrel implicit operands should be tied";
4207 return false;
4208 }
4209 }
4210
4211 const MachineOperand &Src0 = MI.getOperand(Src0Idx);
4212 const MachineOperand &ImpUse
4213 = MI.getOperand(StaticNumOps + NumImplicitOps - 1);
4214 if (!ImpUse.isReg() || !ImpUse.isUse() ||
4215 !isSubRegOf(RI, ImpUse, IsDst ? *Dst : Src0)) {
4216 ErrInfo = "src0 should be subreg of implicit vector use";
4217 return false;
4218 }
4219 }
4220
4221 // Make sure we aren't losing exec uses in the td files. This mostly requires
4222 // being careful when using let Uses to try to add other use registers.
4223 if (shouldReadExec(MI)) {
4224 if (!MI.hasRegisterImplicitUseOperand(AMDGPU::EXEC)) {
4225 ErrInfo = "VALU instruction does not implicitly read exec mask";
4226 return false;
4227 }
4228 }
4229
4230 if (isSMRD(MI)) {
4231 if (MI.mayStore()) {
4232 // The register offset form of scalar stores may only use m0 as the
4233 // soffset register.
4234 const MachineOperand *Soff = getNamedOperand(MI, AMDGPU::OpName::soff);
4235 if (Soff && Soff->getReg() != AMDGPU::M0) {
4236 ErrInfo = "scalar stores must use m0 as offset register";
4237 return false;
4238 }
4239 }
4240 }
4241
4242 if (isFLAT(MI) && !ST.hasFlatInstOffsets()) {
4243 const MachineOperand *Offset = getNamedOperand(MI, AMDGPU::OpName::offset);
4244 if (Offset->getImm() != 0) {
4245 ErrInfo = "subtarget does not support offsets in flat instructions";
4246 return false;
4247 }
4248 }
4249
4250 if (isMIMG(MI)) {
4251 const MachineOperand *DimOp = getNamedOperand(MI, AMDGPU::OpName::dim);
4252 if (DimOp) {
4253 int VAddr0Idx = AMDGPU::getNamedOperandIdx(Opcode,
4254 AMDGPU::OpName::vaddr0);
4255 int SRsrcIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::srsrc);
4256 const AMDGPU::MIMGInfo *Info = AMDGPU::getMIMGInfo(Opcode);
4257 const AMDGPU::MIMGBaseOpcodeInfo *BaseOpcode =
4258 AMDGPU::getMIMGBaseOpcodeInfo(Info->BaseOpcode);
4259 const AMDGPU::MIMGDimInfo *Dim =
4260 AMDGPU::getMIMGDimInfoByEncoding(DimOp->getImm());
4261
4262 if (!Dim) {
4263 ErrInfo = "dim is out of range";
4264 return false;
4265 }
4266
4267 bool IsA16 = false;
4268 if (ST.hasR128A16()) {
4269 const MachineOperand *R128A16 = getNamedOperand(MI, AMDGPU::OpName::r128);
4270 IsA16 = R128A16->getImm() != 0;
4271 } else if (ST.hasGFX10A16()) {
4272 const MachineOperand *A16 = getNamedOperand(MI, AMDGPU::OpName::a16);
4273 IsA16 = A16->getImm() != 0;
4274 }
4275
4276 bool IsNSA = SRsrcIdx - VAddr0Idx > 1;
4277
4278 unsigned AddrWords =
4279 AMDGPU::getAddrSizeMIMGOp(BaseOpcode, Dim, IsA16, ST.hasG16());
4280
4281 unsigned VAddrWords;
4282 if (IsNSA) {
4283 VAddrWords = SRsrcIdx - VAddr0Idx;
4284 } else {
4285 const TargetRegisterClass *RC = getOpRegClass(MI, VAddr0Idx);
4286 VAddrWords = MRI.getTargetRegisterInfo()->getRegSizeInBits(*RC) / 32;
4287 if (AddrWords > 8)
4288 AddrWords = 16;
4289 }
4290
4291 if (VAddrWords != AddrWords) {
4292 LLVM_DEBUG(dbgs() << "bad vaddr size, expected " << AddrWordsdo { } while (false)
4293 << " but got " << VAddrWords << "\n")do { } while (false);
4294 ErrInfo = "bad vaddr size";
4295 return false;
4296 }
4297 }
4298 }
4299
4300 const MachineOperand *DppCt = getNamedOperand(MI, AMDGPU::OpName::dpp_ctrl);
4301 if (DppCt) {
4302 using namespace AMDGPU::DPP;
4303
4304 unsigned DC = DppCt->getImm();
4305 if (DC == DppCtrl::DPP_UNUSED1 || DC == DppCtrl::DPP_UNUSED2 ||
4306 DC == DppCtrl::DPP_UNUSED3 || DC > DppCtrl::DPP_LAST ||
4307 (DC >= DppCtrl::DPP_UNUSED4_FIRST && DC <= DppCtrl::DPP_UNUSED4_LAST) ||
4308 (DC >= DppCtrl::DPP_UNUSED5_FIRST && DC <= DppCtrl::DPP_UNUSED5_LAST) ||
4309 (DC >= DppCtrl::DPP_UNUSED6_FIRST && DC <= DppCtrl::DPP_UNUSED6_LAST) ||
4310 (DC >= DppCtrl::DPP_UNUSED7_FIRST && DC <= DppCtrl::DPP_UNUSED7_LAST) ||
4311 (DC >= DppCtrl::DPP_UNUSED8_FIRST && DC <= DppCtrl::DPP_UNUSED8_LAST)) {
4312 ErrInfo = "Invalid dpp_ctrl value";
4313 return false;
4314 }
4315 if (DC >= DppCtrl::WAVE_SHL1 && DC <= DppCtrl::WAVE_ROR1 &&
4316 ST.getGeneration() >= AMDGPUSubtarget::GFX10) {
4317 ErrInfo = "Invalid dpp_ctrl value: "
4318 "wavefront shifts are not supported on GFX10+";
4319 return false;
4320 }
4321 if (DC >= DppCtrl::BCAST15 && DC <= DppCtrl::BCAST31 &&
4322 ST.getGeneration() >= AMDGPUSubtarget::GFX10) {
4323 ErrInfo = "Invalid dpp_ctrl value: "
4324 "broadcasts are not supported on GFX10+";
4325 return false;
4326 }
4327 if (DC >= DppCtrl::ROW_SHARE_FIRST && DC <= DppCtrl::ROW_XMASK_LAST &&
4328 ST.getGeneration() < AMDGPUSubtarget::GFX10) {
4329 if (DC >= DppCtrl::ROW_NEWBCAST_FIRST &&
4330 DC <= DppCtrl::ROW_NEWBCAST_LAST &&
4331 !ST.hasGFX90AInsts()) {
4332 ErrInfo = "Invalid dpp_ctrl value: "
4333 "row_newbroadcast/row_share is not supported before "
4334 "GFX90A/GFX10";
4335 return false;
4336 } else if (DC > DppCtrl::ROW_NEWBCAST_LAST || !ST.hasGFX90AInsts()) {
4337 ErrInfo = "Invalid dpp_ctrl value: "
4338 "row_share and row_xmask are not supported before GFX10";
4339 return false;
4340 }
4341 }
4342
4343 int DstIdx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::vdst);
4344 int Src0Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src0);
4345
4346 if (Opcode != AMDGPU::V_MOV_B64_DPP_PSEUDO &&
4347 ((DstIdx >= 0 &&
4348 (Desc.OpInfo[DstIdx].RegClass == AMDGPU::VReg_64RegClassID ||
4349 Desc.OpInfo[DstIdx].RegClass == AMDGPU::VReg_64_Align2RegClassID)) ||
4350 ((Src0Idx >= 0 &&
4351 (Desc.OpInfo[Src0Idx].RegClass == AMDGPU::VReg_64RegClassID ||
4352 Desc.OpInfo[Src0Idx].RegClass ==
4353 AMDGPU::VReg_64_Align2RegClassID)))) &&
4354 !AMDGPU::isLegal64BitDPPControl(DC)) {
4355 ErrInfo = "Invalid dpp_ctrl value: "
4356 "64 bit dpp only support row_newbcast";
4357 return false;
4358 }
4359 }
4360
4361 if ((MI.mayStore() || MI.mayLoad()) && !isVGPRSpill(MI)) {
4362 const MachineOperand *Dst = getNamedOperand(MI, AMDGPU::OpName::vdst);
4363 uint16_t DataNameIdx = isDS(Opcode) ? AMDGPU::OpName::data0
4364 : AMDGPU::OpName::vdata;
4365 const MachineOperand *Data = getNamedOperand(MI, DataNameIdx);
4366 const MachineOperand *Data2 = getNamedOperand(MI, AMDGPU::OpName::data1);
4367 if (Data && !Data->isReg())
4368 Data = nullptr;
4369
4370 if (ST.hasGFX90AInsts()) {
4371 if (Dst && Data &&
4372 (RI.isAGPR(MRI, Dst->getReg()) != RI.isAGPR(MRI, Data->getReg()))) {
4373 ErrInfo = "Invalid register class: "
4374 "vdata and vdst should be both VGPR or AGPR";
4375 return false;
4376 }
4377 if (Data && Data2 &&
4378 (RI.isAGPR(MRI, Data->getReg()) != RI.isAGPR(MRI, Data2->getReg()))) {
4379 ErrInfo = "Invalid register class: "
4380 "both data operands should be VGPR or AGPR";
4381 return false;
4382 }
4383 } else {
4384 if ((Dst && RI.isAGPR(MRI, Dst->getReg())) ||
4385 (Data && RI.isAGPR(MRI, Data->getReg())) ||
4386 (Data2 && RI.isAGPR(MRI, Data2->getReg()))) {
4387 ErrInfo = "Invalid register class: "
4388 "agpr loads and stores not supported on this GPU";
4389 return false;
4390 }
4391 }
4392 }
4393
4394 if (ST.needsAlignedVGPRs() &&
4395 (MI.getOpcode() == AMDGPU::DS_GWS_INIT ||
4396 MI.getOpcode() == AMDGPU::DS_GWS_SEMA_BR ||
4397 MI.getOpcode() == AMDGPU::DS_GWS_BARRIER)) {
4398 const MachineOperand *Op = getNamedOperand(MI, AMDGPU::OpName::data0);
4399 Register Reg = Op->getReg();
4400 bool Aligned = true;
4401 if (Reg.isPhysical()) {
4402 Aligned = !(RI.getHWRegIndex(Reg) & 1);
4403 } else {
4404 const TargetRegisterClass &RC = *MRI.getRegClass(Reg);
4405 Aligned = RI.getRegSizeInBits(RC) > 32 && RI.isProperlyAlignedRC(RC) &&
4406 !(RI.getChannelFromSubReg(Op->getSubReg()) & 1);
4407 }
4408
4409 if (!Aligned) {
4410 ErrInfo = "Subtarget requires even aligned vector registers "
4411 "for DS_GWS instructions";
4412 return false;
4413 }
4414 }
4415
4416 return true;
4417}
4418
4419unsigned SIInstrInfo::getVALUOp(const MachineInstr &MI) const {
4420 switch (MI.getOpcode()) {
4421 default: return AMDGPU::INSTRUCTION_LIST_END;
4422 case AMDGPU::REG_SEQUENCE: return AMDGPU::REG_SEQUENCE;
4423 case AMDGPU::COPY: return AMDGPU::COPY;
4424 case AMDGPU::PHI: return AMDGPU::PHI;
4425 case AMDGPU::INSERT_SUBREG: return AMDGPU::INSERT_SUBREG;
4426 case AMDGPU::WQM: return AMDGPU::WQM;
4427 case AMDGPU::SOFT_WQM: return AMDGPU::SOFT_WQM;
4428 case AMDGPU::STRICT_WWM: return AMDGPU::STRICT_WWM;
4429 case AMDGPU::STRICT_WQM: return AMDGPU::STRICT_WQM;
4430 case AMDGPU::S_MOV_B32: {
4431 const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
4432 return MI.getOperand(1).isReg() ||
4433 RI.isAGPR(MRI, MI.getOperand(0).getReg()) ?
4434 AMDGPU::COPY : AMDGPU::V_MOV_B32_e32;
4435 }
4436 case AMDGPU::S_ADD_I32:
4437 return ST.hasAddNoCarry() ? AMDGPU::V_ADD_U32_e64 : AMDGPU::V_ADD_CO_U32_e32;
4438 case AMDGPU::S_ADDC_U32:
4439 return AMDGPU::V_ADDC_U32_e32;
4440 case AMDGPU::S_SUB_I32:
4441 return ST.hasAddNoCarry() ? AMDGPU::V_SUB_U32_e64 : AMDGPU::V_SUB_CO_U32_e32;
4442 // FIXME: These are not consistently handled, and selected when the carry is
4443 // used.
4444 case AMDGPU::S_ADD_U32:
4445 return AMDGPU::V_ADD_CO_U32_e32;
4446 case AMDGPU::S_SUB_U32:
4447 return AMDGPU::V_SUB_CO_U32_e32;
4448 case AMDGPU::S_SUBB_U32: return AMDGPU::V_SUBB_U32_e32;
4449 case AMDGPU::S_MUL_I32: return AMDGPU::V_MUL_LO_U32_e64;
4450 case AMDGPU::S_MUL_HI_U32: return AMDGPU::V_MUL_HI_U32_e64;
4451 case AMDGPU::S_MUL_HI_I32: return AMDGPU::V_MUL_HI_I32_e64;
4452 case AMDGPU::S_AND_B32: return AMDGPU::V_AND_B32_e64;
4453 case AMDGPU::S_OR_B32: return AMDGPU::V_OR_B32_e64;
4454 case AMDGPU::S_XOR_B32: return AMDGPU::V_XOR_B32_e64;
4455 case AMDGPU::S_XNOR_B32:
4456 return ST.hasDLInsts() ? AMDGPU::V_XNOR_B32_e64 : AMDGPU::INSTRUCTION_LIST_END;
4457 case AMDGPU::S_MIN_I32: return AMDGPU::V_MIN_I32_e64;
4458 case AMDGPU::S_MIN_U32: return AMDGPU::V_MIN_U32_e64;
4459 case AMDGPU::S_MAX_I32: return AMDGPU::V_MAX_I32_e64;
4460 case AMDGPU::S_MAX_U32: return AMDGPU::V_MAX_U32_e64;
4461 case AMDGPU::S_ASHR_I32: return AMDGPU::V_ASHR_I32_e32;
4462 case AMDGPU::S_ASHR_I64: return AMDGPU::V_ASHR_I64_e64;
4463 case AMDGPU::S_LSHL_B32: return AMDGPU::V_LSHL_B32_e32;
4464 case AMDGPU::S_LSHL_B64: return AMDGPU::V_LSHL_B64_e64;
4465 case AMDGPU::S_LSHR_B32: return AMDGPU::V_LSHR_B32_e32;
4466 case AMDGPU::S_LSHR_B64: return AMDGPU::V_LSHR_B64_e64;
4467 case AMDGPU::S_SEXT_I32_I8: return AMDGPU::V_BFE_I32_e64;
4468 case AMDGPU::S_SEXT_I32_I16: return AMDGPU::V_BFE_I32_e64;
4469 case AMDGPU::S_BFE_U32: return AMDGPU::V_BFE_U32_e64;
4470 case AMDGPU::S_BFE_I32: return AMDGPU::V_BFE_I32_e64;
4471 case AMDGPU::S_BFM_B32: return AMDGPU::V_BFM_B32_e64;
4472 case AMDGPU::S_BREV_B32: return AMDGPU::V_BFREV_B32_e32;
4473 case AMDGPU::S_NOT_B32: return AMDGPU::V_NOT_B32_e32;
4474 case AMDGPU::S_NOT_B64: return AMDGPU::V_NOT_B32_e32;
4475 case AMDGPU::S_CMP_EQ_I32: return AMDGPU::V_CMP_EQ_I32_e32;
4476 case AMDGPU::S_CMP_LG_I32: return AMDGPU::V_CMP_NE_I32_e32;
4477 case AMDGPU::S_CMP_GT_I32: return AMDGPU::V_CMP_GT_I32_e32;
4478 case AMDGPU::S_CMP_GE_I32: return AMDGPU::V_CMP_GE_I32_e32;
4479 case AMDGPU::S_CMP_LT_I32: return AMDGPU::V_CMP_LT_I32_e32;
4480 case AMDGPU::S_CMP_LE_I32: return AMDGPU::V_CMP_LE_I32_e32;
4481 case AMDGPU::S_CMP_EQ_U32: return AMDGPU::V_CMP_EQ_U32_e32;
4482 case AMDGPU::S_CMP_LG_U32: return AMDGPU::V_CMP_NE_U32_e32;
4483 case AMDGPU::S_CMP_GT_U32: return AMDGPU::V_CMP_GT_U32_e32;
4484 case AMDGPU::S_CMP_GE_U32: return AMDGPU::V_CMP_GE_U32_e32;
4485 case AMDGPU::S_CMP_LT_U32: return AMDGPU::V_CMP_LT_U32_e32;
4486 case AMDGPU::S_CMP_LE_U32: return AMDGPU::V_CMP_LE_U32_e32;
4487 case AMDGPU::S_CMP_EQ_U64: return AMDGPU::V_CMP_EQ_U64_e32;
4488 case AMDGPU::S_CMP_LG_U64: return AMDGPU::V_CMP_NE_U64_e32;
4489 case AMDGPU::S_BCNT1_I32_B32: return AMDGPU::V_BCNT_U32_B32_e64;
4490 case AMDGPU::S_FF1_I32_B32: return AMDGPU::V_FFBL_B32_e32;
4491 case AMDGPU::S_FLBIT_I32_B32: return AMDGPU::V_FFBH_U32_e32;
4492 case AMDGPU::S_FLBIT_I32: return AMDGPU::V_FFBH_I32_e64;
4493 case AMDGPU::S_CBRANCH_SCC0: return AMDGPU::S_CBRANCH_VCCZ;
4494 case AMDGPU::S_CBRANCH_SCC1: return AMDGPU::S_CBRANCH_VCCNZ;
4495 }
4496 llvm_unreachable(__builtin_unreachable()
4497 "Unexpected scalar opcode without corresponding vector one!")__builtin_unreachable();
4498}
4499
4500static unsigned adjustAllocatableRegClass(const GCNSubtarget &ST,
4501 const MachineRegisterInfo &MRI,
4502 const MCInstrDesc &TID,
4503 unsigned RCID,
4504 bool IsAllocatable) {
4505 if ((IsAllocatable || !ST.hasGFX90AInsts() || !MRI.reservedRegsFrozen()) &&
4506 (TID.mayLoad() || TID.mayStore() ||
4507 (TID.TSFlags & (SIInstrFlags::DS | SIInstrFlags::MIMG)))) {
4508 switch (RCID) {
4509 case AMDGPU::AV_32RegClassID: return AMDGPU::VGPR_32RegClassID;
4510 case AMDGPU::AV_64RegClassID: return AMDGPU::VReg_64RegClassID;
4511 case AMDGPU::AV_96RegClassID: return AMDGPU::VReg_96RegClassID;
4512 case AMDGPU::AV_128RegClassID: return AMDGPU::VReg_128RegClassID;
4513 case AMDGPU::AV_160RegClassID: return AMDGPU::VReg_160RegClassID;
4514 default:
4515 break;
4516 }
4517 }
4518 return RCID;
4519}
4520
4521const TargetRegisterClass *SIInstrInfo::getRegClass(const MCInstrDesc &TID,
4522 unsigned OpNum, const TargetRegisterInfo *TRI,
4523 const MachineFunction &MF)
4524 const {
4525 if (OpNum >= TID.getNumOperands())
4526 return nullptr;
4527 auto RegClass = TID.OpInfo[OpNum].RegClass;
4528 bool IsAllocatable = false;
4529 if (TID.TSFlags & (SIInstrFlags::DS | SIInstrFlags::FLAT)) {
4530 // vdst and vdata should be both VGPR or AGPR, same for the DS instructions
4531 // with two data operands. Request register class constainted to VGPR only
4532 // of both operands present as Machine Copy Propagation can not check this
4533 // constraint and possibly other passes too.
4534 //
4535 // The check is limited to FLAT and DS because atomics in non-flat encoding
4536 // have their vdst and vdata tied to be the same register.
4537 const int VDstIdx = AMDGPU::getNamedOperandIdx(TID.Opcode,
4538 AMDGPU::OpName::vdst);
4539 const int DataIdx = AMDGPU::getNamedOperandIdx(TID.Opcode,
4540 (TID.TSFlags & SIInstrFlags::DS) ? AMDGPU::OpName::data0
4541 : AMDGPU::OpName::vdata);
4542 if (DataIdx != -1) {
4543 IsAllocatable = VDstIdx != -1 ||
4544 AMDGPU::getNamedOperandIdx(TID.Opcode,
4545 AMDGPU::OpName::data1) != -1;
4546 }
4547 }
4548 RegClass = adjustAllocatableRegClass(ST, MF.getRegInfo(), TID, RegClass,
4549 IsAllocatable);
4550 return RI.getRegClass(RegClass);
4551}
4552
4553const TargetRegisterClass *SIInstrInfo::getOpRegClass(const MachineInstr &MI,
4554 unsigned OpNo) const {
4555 const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo();
4556 const MCInstrDesc &Desc = get(MI.getOpcode());
4557 if (MI.isVariadic() || OpNo >= Desc.getNumOperands() ||
4558 Desc.OpInfo[OpNo].RegClass == -1) {
4559 Register Reg = MI.getOperand(OpNo).getReg();
4560
4561 if (Reg.isVirtual())
4562 return MRI.getRegClass(Reg);
4563 return RI.getPhysRegClass(Reg);
4564 }
4565
4566 unsigned RCID = Desc.OpInfo[OpNo].RegClass;
4567 RCID = adjustAllocatableRegClass(ST, MRI, Desc, RCID, true);
4568 return RI.getRegClass(RCID);
4569}
4570
4571void SIInstrInfo::legalizeOpWithMove(MachineInstr &MI, unsigned OpIdx) const {
4572 MachineBasicBlock::iterator I = MI;
4573 MachineBasicBlock *MBB = MI.getParent();
4574 MachineOperand &MO = MI.getOperand(OpIdx);
4575 MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
4576 unsigned RCID = get(MI.getOpcode()).OpInfo[OpIdx].RegClass;
4577 const TargetRegisterClass *RC = RI.getRegClass(RCID);
4578 unsigned Size = RI.getRegSizeInBits(*RC);
4579 unsigned Opcode = (Size == 64) ? AMDGPU::V_MOV_B64_PSEUDO : AMDGPU::V_MOV_B32_e32;
4580 if (MO.isReg())
4581 Opcode = AMDGPU::COPY;
4582 else if (RI.isSGPRClass(RC))
4583 Opcode = (Size == 64) ? AMDGPU::S_MOV_B64 : AMDGPU::S_MOV_B32;
4584
4585 const TargetRegisterClass *VRC = RI.getEquivalentVGPRClass(RC);
4586 const TargetRegisterClass *VRC64 = RI.getVGPR64Class();
4587 if (RI.getCommonSubClass(VRC64, VRC))
4588 VRC = VRC64;
4589 else
4590 VRC = &AMDGPU::VGPR_32RegClass;
4591
4592 Register Reg = MRI.createVirtualRegister(VRC);
4593 DebugLoc DL = MBB->findDebugLoc(I);
4594 BuildMI(*MI.getParent(), I, DL, get(Opcode), Reg).add(MO);
4595 MO.ChangeToRegister(Reg, false);
4596}
4597
4598unsigned SIInstrInfo::buildExtractSubReg(MachineBasicBlock::iterator MI,
4599 MachineRegisterInfo &MRI,
4600 MachineOperand &SuperReg,
4601 const TargetRegisterClass *SuperRC,
4602 unsigned SubIdx,
4603 const TargetRegisterClass *SubRC)
4604 const {
4605 MachineBasicBlock *MBB = MI->getParent();
4606 DebugLoc DL = MI->getDebugLoc();
4607 Register SubReg = MRI.createVirtualRegister(SubRC);
4608
4609 if (SuperReg.getSubReg() == AMDGPU::NoSubRegister) {
4610 BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), SubReg)
4611 .addReg(SuperReg.getReg(), 0, SubIdx);
4612 return SubReg;
4613 }
4614
4615 // Just in case the super register is itself a sub-register, copy it to a new
4616 // value so we don't need to worry about merging its subreg index with the
4617 // SubIdx passed to this function. The register coalescer should be able to
4618 // eliminate this extra copy.
4619 Register NewSuperReg = MRI.createVirtualRegister(SuperRC);
4620
4621 BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), NewSuperReg)
4622 .addReg(SuperReg.getReg(), 0, SuperReg.getSubReg());
4623
4624 BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), SubReg)
4625 .addReg(NewSuperReg, 0, SubIdx);
4626
4627 return SubReg;
4628}
4629
4630MachineOperand SIInstrInfo::buildExtractSubRegOrImm(
4631 MachineBasicBlock::iterator MII,
4632 MachineRegisterInfo &MRI,
4633 MachineOperand &Op,
4634 const TargetRegisterClass *SuperRC,
4635 unsigned SubIdx,
4636 const TargetRegisterClass *SubRC) const {
4637 if (Op.isImm()) {
4638 if (SubIdx == AMDGPU::sub0)
4639 return MachineOperand::CreateImm(static_cast<int32_t>(Op.getImm()));
4640 if (SubIdx == AMDGPU::sub1)
4641 return MachineOperand::CreateImm(static_cast<int32_t>(Op.getImm() >> 32));
4642
4643 llvm_unreachable("Unhandled register index for immediate")__builtin_unreachable();
4644 }
4645
4646 unsigned SubReg = buildExtractSubReg(MII, MRI, Op, SuperRC,
4647 SubIdx, SubRC);
4648 return MachineOperand::CreateReg(SubReg, false);
4649}
4650
4651// Change the order of operands from (0, 1, 2) to (0, 2, 1)
4652void SIInstrInfo::swapOperands(MachineInstr &Inst) const {
4653 assert(Inst.getNumExplicitOperands() == 3)((void)0);
4654 MachineOperand Op1 = Inst.getOperand(1);
4655 Inst.RemoveOperand(1);
4656 Inst.addOperand(Op1);
4657}
4658
4659bool SIInstrInfo::isLegalRegOperand(const MachineRegisterInfo &MRI,
4660 const MCOperandInfo &OpInfo,
4661 const MachineOperand &MO) const {
4662 if (!MO.isReg())
4663 return false;
4664
4665 Register Reg = MO.getReg();
4666
4667 const TargetRegisterClass *DRC = RI.getRegClass(OpInfo.RegClass);
4668 if (Reg.isPhysical())
4669 return DRC->contains(Reg);
4670
4671 const TargetRegisterClass *RC = MRI.getRegClass(Reg);
4672
4673 if (MO.getSubReg()) {
4674 const MachineFunction *MF = MO.getParent()->getParent()->getParent();
4675 const TargetRegisterClass *SuperRC = RI.getLargestLegalSuperClass(RC, *MF);
4676 if (!SuperRC)
4677 return false;
4678
4679 DRC = RI.getMatchingSuperRegClass(SuperRC, DRC, MO.getSubReg());
4680 if (!DRC)
4681 return false;
4682 }
4683 return RC->hasSuperClassEq(DRC);
4684}
4685
4686bool SIInstrInfo::isLegalVSrcOperand(const MachineRegisterInfo &MRI,
4687 const MCOperandInfo &OpInfo,
4688 const MachineOperand &MO) const {
4689 if (MO.isReg())
4690 return isLegalRegOperand(MRI, OpInfo, MO);
4691
4692 // Handle non-register types that are treated like immediates.
4693 assert(MO.isImm() || MO.isTargetIndex() || MO.isFI() || MO.isGlobal())((void)0);
4694 return true;
4695}
4696
4697bool SIInstrInfo::isOperandLegal(const MachineInstr &MI, unsigned OpIdx,
4698 const MachineOperand *MO) const {
4699 const MachineFunction &MF = *MI.getParent()->getParent();
4700 const MachineRegisterInfo &MRI = MF.getRegInfo();
4701 const MCInstrDesc &InstDesc = MI.getDesc();
4702 const MCOperandInfo &OpInfo = InstDesc.OpInfo[OpIdx];
4703 const TargetRegisterClass *DefinedRC =
4704 OpInfo.RegClass != -1 ? RI.getRegClass(OpInfo.RegClass) : nullptr;
4705 if (!MO)
4706 MO = &MI.getOperand(OpIdx);
4707
4708 int ConstantBusLimit = ST.getConstantBusLimit(MI.getOpcode());
4709 int VOP3LiteralLimit = ST.hasVOP3Literal() ? 1 : 0;
4710 if (isVALU(MI) && usesConstantBus(MRI, *MO, OpInfo)) {
4711 if (isVOP3(MI) && isLiteralConstantLike(*MO, OpInfo) && !VOP3LiteralLimit--)
4712 return false;
4713
4714 SmallDenseSet<RegSubRegPair> SGPRsUsed;
4715 if (MO->isReg())
4716 SGPRsUsed.insert(RegSubRegPair(MO->getReg(), MO->getSubReg()));
4717
4718 for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) {
4719 if (i == OpIdx)
4720 continue;
4721 const MachineOperand &Op = MI.getOperand(i);
4722 if (Op.isReg()) {
4723 RegSubRegPair SGPR(Op.getReg(), Op.getSubReg());
4724 if (!SGPRsUsed.count(SGPR) &&
4725 usesConstantBus(MRI, Op, InstDesc.OpInfo[i])) {
4726 if (--ConstantBusLimit <= 0)
4727 return false;
4728 SGPRsUsed.insert(SGPR);
4729 }
4730 } else if (InstDesc.OpInfo[i].OperandType == AMDGPU::OPERAND_KIMM32) {
4731 if (--ConstantBusLimit <= 0)
4732 return false;
4733 } else if (isVOP3(MI) && AMDGPU::isSISrcOperand(InstDesc, i) &&
4734 isLiteralConstantLike(Op, InstDesc.OpInfo[i])) {
4735 if (!VOP3LiteralLimit--)
4736 return false;
4737 if (--ConstantBusLimit <= 0)
4738 return false;
4739 }
4740 }
4741 }
4742
4743 if (MO->isReg()) {
4744 assert(DefinedRC)((void)0);
4745 if (!isLegalRegOperand(MRI, OpInfo, *MO))
4746 return false;
4747 bool IsAGPR = RI.isAGPR(MRI, MO->getReg());
4748 if (IsAGPR && !ST.hasMAIInsts())
4749 return false;
4750 unsigned Opc = MI.getOpcode();
4751 if (IsAGPR &&
4752 (!ST.hasGFX90AInsts() || !MRI.reservedRegsFrozen()) &&
4753 (MI.mayLoad() || MI.mayStore() || isDS(Opc) || isMIMG(Opc)))
4754 return false;
4755 // Atomics should have both vdst and vdata either vgpr or agpr.
4756 const int VDstIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst);
4757 const int DataIdx = AMDGPU::getNamedOperandIdx(Opc,
4758 isDS(Opc) ? AMDGPU::OpName::data0 : AMDGPU::OpName::vdata);
4759 if ((int)OpIdx == VDstIdx && DataIdx != -1 &&
4760 MI.getOperand(DataIdx).isReg() &&
4761 RI.isAGPR(MRI, MI.getOperand(DataIdx).getReg()) != IsAGPR)
4762 return false;
4763 if ((int)OpIdx == DataIdx) {
4764 if (VDstIdx != -1 &&
4765 RI.isAGPR(MRI, MI.getOperand(VDstIdx).getReg()) != IsAGPR)
4766 return false;
4767 // DS instructions with 2 src operands also must have tied RC.
4768 const int Data1Idx = AMDGPU::getNamedOperandIdx(Opc,
4769 AMDGPU::OpName::data1);
4770 if (Data1Idx != -1 && MI.getOperand(Data1Idx).isReg() &&
4771 RI.isAGPR(MRI, MI.getOperand(Data1Idx).getReg()) != IsAGPR)
4772 return false;
4773 }
4774 if (Opc == AMDGPU::V_ACCVGPR_WRITE_B32_e64 &&
4775 (int)OpIdx == AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0) &&
4776 RI.isSGPRReg(MRI, MO->getReg()))
4777 return false;
4778 return true;
4779 }
4780
4781 // Handle non-register types that are treated like immediates.
4782 assert(MO->isImm() || MO->isTargetIndex() || MO->isFI() || MO->isGlobal())((void)0);
4783
4784 if (!DefinedRC) {
4785 // This operand expects an immediate.
4786 return true;
4787 }
4788
4789 return isImmOperandLegal(MI, OpIdx, *MO);
4790}
4791
4792void SIInstrInfo::legalizeOperandsVOP2(MachineRegisterInfo &MRI,
4793 MachineInstr &MI) const {
4794 unsigned Opc = MI.getOpcode();
4795 const MCInstrDesc &InstrDesc = get(Opc);
4796
4797 int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0);
4798 MachineOperand &Src0 = MI.getOperand(Src0Idx);
4799
4800 int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1);
4801 MachineOperand &Src1 = MI.getOperand(Src1Idx);
4802
4803 // If there is an implicit SGPR use such as VCC use for v_addc_u32/v_subb_u32
4804 // we need to only have one constant bus use before GFX10.
4805 bool HasImplicitSGPR = findImplicitSGPRRead(MI) != AMDGPU::NoRegister;
4806 if (HasImplicitSGPR && ST.getConstantBusLimit(Opc) <= 1 &&
4807 Src0.isReg() && (RI.isSGPRReg(MRI, Src0.getReg()) ||
4808 isLiteralConstantLike(Src0, InstrDesc.OpInfo[Src0Idx])))
4809 legalizeOpWithMove(MI, Src0Idx);
4810
4811 // Special case: V_WRITELANE_B32 accepts only immediate or SGPR operands for
4812 // both the value to write (src0) and lane select (src1). Fix up non-SGPR
4813 // src0/src1 with V_READFIRSTLANE.
4814 if (Opc == AMDGPU::V_WRITELANE_B32) {
4815 const DebugLoc &DL = MI.getDebugLoc();
4816 if (Src0.isReg() && RI.isVGPR(MRI, Src0.getReg())) {
4817 Register Reg = MRI.createVirtualRegister(&AMDGPU::SReg_32_XM0RegClass);
4818 BuildMI(*MI.getParent(), MI, DL, get(AMDGPU::V_READFIRSTLANE_B32), Reg)
4819 .add(Src0);
4820 Src0.ChangeToRegister(Reg, false);
4821 }
4822 if (Src1.isReg() && RI.isVGPR(MRI, Src1.getReg())) {
4823 Register Reg = MRI.createVirtualRegister(&AMDGPU::SReg_32_XM0RegClass);
4824 const DebugLoc &DL = MI.getDebugLoc();
4825 BuildMI(*MI.getParent(), MI, DL, get(AMDGPU::V_READFIRSTLANE_B32), Reg)
4826 .add(Src1);
4827 Src1.ChangeToRegister(Reg, false);
4828 }
4829 return;
4830 }
4831
4832 // No VOP2 instructions support AGPRs.
4833 if (Src0.isReg() && RI.isAGPR(MRI, Src0.getReg()))
4834 legalizeOpWithMove(MI, Src0Idx);
4835
4836 if (Src1.isReg() && RI.isAGPR(MRI, Src1.getReg()))
4837 legalizeOpWithMove(MI, Src1Idx);
4838
4839 // VOP2 src0 instructions support all operand types, so we don't need to check
4840 // their legality. If src1 is already legal, we don't need to do anything.
4841 if (isLegalRegOperand(MRI, InstrDesc.OpInfo[Src1Idx], Src1))
4842 return;
4843
4844 // Special case: V_READLANE_B32 accepts only immediate or SGPR operands for
4845 // lane select. Fix up using V_READFIRSTLANE, since we assume that the lane
4846 // select is uniform.
4847 if (Opc == AMDGPU::V_READLANE_B32 && Src1.isReg() &&
4848 RI.isVGPR(MRI, Src1.getReg())) {
4849 Register Reg = MRI.createVirtualRegister(&AMDGPU::SReg_32_XM0RegClass);
4850 const DebugLoc &DL = MI.getDebugLoc();
4851 BuildMI(*MI.getParent(), MI, DL, get(AMDGPU::V_READFIRSTLANE_B32), Reg)
4852 .add(Src1);
4853 Src1.ChangeToRegister(Reg, false);
4854 return;
4855 }
4856
4857 // We do not use commuteInstruction here because it is too aggressive and will
4858 // commute if it is possible. We only want to commute here if it improves
4859 // legality. This can be called a fairly large number of times so don't waste
4860 // compile time pointlessly swapping and checking legality again.
4861 if (HasImplicitSGPR || !MI.isCommutable()) {
4862 legalizeOpWithMove(MI, Src1Idx);
4863 return;
4864 }
4865
4866 // If src0 can be used as src1, commuting will make the operands legal.
4867 // Otherwise we have to give up and insert a move.
4868 //
4869 // TODO: Other immediate-like operand kinds could be commuted if there was a
4870 // MachineOperand::ChangeTo* for them.
4871 if ((!Src1.isImm() && !Src1.isReg()) ||
4872 !isLegalRegOperand(MRI, InstrDesc.OpInfo[Src1Idx], Src0)) {
4873 legalizeOpWithMove(MI, Src1Idx);
4874 return;
4875 }
4876
4877 int CommutedOpc = commuteOpcode(MI);
4878 if (CommutedOpc == -1) {
4879 legalizeOpWithMove(MI, Src1Idx);
4880 return;
4881 }
4882
4883 MI.setDesc(get(CommutedOpc));
4884
4885 Register Src0Reg = Src0.getReg();
4886 unsigned Src0SubReg = Src0.getSubReg();
4887 bool Src0Kill = Src0.isKill();
4888
4889 if (Src1.isImm())
4890 Src0.ChangeToImmediate(Src1.getImm());
4891 else if (Src1.isReg()) {
4892 Src0.ChangeToRegister(Src1.getReg(), false, false, Src1.isKill());
4893 Src0.setSubReg(Src1.getSubReg());
4894 } else
4895 llvm_unreachable("Should only have register or immediate operands")__builtin_unreachable();
4896
4897 Src1.ChangeToRegister(Src0Reg, false, false, Src0Kill);
4898 Src1.setSubReg(Src0SubReg);
4899 fixImplicitOperands(MI);
4900}
4901
4902// Legalize VOP3 operands. All operand types are supported for any operand
4903// but only one literal constant and only starting from GFX10.
4904void SIInstrInfo::legalizeOperandsVOP3(MachineRegisterInfo &MRI,
4905 MachineInstr &MI) const {
4906 unsigned Opc = MI.getOpcode();
4907
4908 int VOP3Idx[3] = {
4909 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0),
4910 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1),
4911 AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2)
4912 };
4913
4914 if (Opc == AMDGPU::V_PERMLANE16_B32_e64 ||
4915 Opc == AMDGPU::V_PERMLANEX16_B32_e64) {
4916 // src1 and src2 must be scalar
4917 MachineOperand &Src1 = MI.getOperand(VOP3Idx[1]);
4918 MachineOperand &Src2 = MI.getOperand(VOP3Idx[2]);
4919 const DebugLoc &DL = MI.getDebugLoc();
4920 if (Src1.isReg() && !RI.isSGPRClass(MRI.getRegClass(Src1.getReg()))) {
4921 Register Reg = MRI.createVirtualRegister(&AMDGPU::SReg_32_XM0RegClass);
4922 BuildMI(*MI.getParent(), MI, DL, get(AMDGPU::V_READFIRSTLANE_B32), Reg)
4923 .add(Src1);
4924 Src1.ChangeToRegister(Reg, false);
4925 }
4926 if (Src2.isReg() && !RI.isSGPRClass(MRI.getRegClass(Src2.getReg()))) {
4927 Register Reg = MRI.createVirtualRegister(&AMDGPU::SReg_32_XM0RegClass);
4928 BuildMI(*MI.getParent(), MI, DL, get(AMDGPU::V_READFIRSTLANE_B32), Reg)
4929 .add(Src2);
4930 Src2.ChangeToRegister(Reg, false);
4931 }
4932 }
4933
4934 // Find the one SGPR operand we are allowed to use.
4935 int ConstantBusLimit = ST.getConstantBusLimit(Opc);
4936 int LiteralLimit = ST.hasVOP3Literal() ? 1 : 0;
4937 SmallDenseSet<unsigned> SGPRsUsed;
4938 Register SGPRReg = findUsedSGPR(MI, VOP3Idx);
4939 if (SGPRReg != AMDGPU::NoRegister) {
4940 SGPRsUsed.insert(SGPRReg);
4941 --ConstantBusLimit;
4942 }
4943
4944 for (unsigned i = 0; i < 3; ++i) {
4945 int Idx = VOP3Idx[i];
4946 if (Idx == -1)
4947 break;
4948 MachineOperand &MO = MI.getOperand(Idx);
4949
4950 if (!MO.isReg()) {
4951 if (!isLiteralConstantLike(MO, get(Opc).OpInfo[Idx]))
4952 continue;
4953
4954 if (LiteralLimit > 0 && ConstantBusLimit > 0) {
4955 --LiteralLimit;
4956 --ConstantBusLimit;
4957 continue;
4958 }
4959
4960 --LiteralLimit;
4961 --ConstantBusLimit;
4962 legalizeOpWithMove(MI, Idx);
4963 continue;
4964 }
4965
4966 if (RI.hasAGPRs(MRI.getRegClass(MO.getReg())) &&
4967 !isOperandLegal(MI, Idx, &MO)) {
4968 legalizeOpWithMove(MI, Idx);
4969 continue;
4970 }
4971
4972 if (!RI.isSGPRClass(MRI.getRegClass(MO.getReg())))
4973 continue; // VGPRs are legal
4974
4975 // We can use one SGPR in each VOP3 instruction prior to GFX10
4976 // and two starting from GFX10.
4977 if (SGPRsUsed.count(MO.getReg()))
4978 continue;
4979 if (ConstantBusLimit > 0) {
4980 SGPRsUsed.insert(MO.getReg());
4981 --ConstantBusLimit;
4982 continue;
4983 }
4984
4985 // If we make it this far, then the operand is not legal and we must
4986 // legalize it.
4987 legalizeOpWithMove(MI, Idx);
4988 }
4989}
4990
4991Register SIInstrInfo::readlaneVGPRToSGPR(Register SrcReg, MachineInstr &UseMI,
4992 MachineRegisterInfo &MRI) const {
4993 const TargetRegisterClass *VRC = MRI.getRegClass(SrcReg);
4994 const TargetRegisterClass *SRC = RI.getEquivalentSGPRClass(VRC);
4995 Register DstReg = MRI.createVirtualRegister(SRC);
4996 unsigned SubRegs = RI.getRegSizeInBits(*VRC) / 32;
4997
4998 if (RI.hasAGPRs(VRC)) {
4999 VRC = RI.getEquivalentVGPRClass(VRC);
5000 Register NewSrcReg = MRI.createVirtualRegister(VRC);
5001 BuildMI(*UseMI.getParent(), UseMI, UseMI.getDebugLoc(),
5002 get(TargetOpcode::COPY), NewSrcReg)
5003 .addReg(SrcReg);
5004 SrcReg = NewSrcReg;
5005 }
5006
5007 if (SubRegs == 1) {
5008 BuildMI(*UseMI.getParent(), UseMI, UseMI.getDebugLoc(),
5009 get(AMDGPU::V_READFIRSTLANE_B32), DstReg)
5010 .addReg(SrcReg);
5011 return DstReg;
5012 }
5013
5014 SmallVector<unsigned, 8> SRegs;
5015 for (unsigned i = 0; i < SubRegs; ++i) {
5016 Register SGPR = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
5017 BuildMI(*UseMI.getParent(), UseMI, UseMI.getDebugLoc(),
5018 get(AMDGPU::V_READFIRSTLANE_B32), SGPR)
5019 .addReg(SrcReg, 0, RI.getSubRegFromChannel(i));
5020 SRegs.push_back(SGPR);
5021 }
5022
5023 MachineInstrBuilder MIB =
5024 BuildMI(*UseMI.getParent(), UseMI, UseMI.getDebugLoc(),
5025 get(AMDGPU::REG_SEQUENCE), DstReg);
5026 for (unsigned i = 0; i < SubRegs; ++i) {
5027 MIB.addReg(SRegs[i]);
5028 MIB.addImm(RI.getSubRegFromChannel(i));
5029 }
5030 return DstReg;
5031}
5032
5033void SIInstrInfo::legalizeOperandsSMRD(MachineRegisterInfo &MRI,
5034 MachineInstr &MI) const {
5035
5036 // If the pointer is store in VGPRs, then we need to move them to
5037 // SGPRs using v_readfirstlane. This is safe because we only select
5038 // loads with uniform pointers to SMRD instruction so we know the
5039 // pointer value is uniform.
5040 MachineOperand *SBase = getNamedOperand(MI, AMDGPU::OpName::sbase);
5041 if (SBase && !RI.isSGPRClass(MRI.getRegClass(SBase->getReg()))) {
5042 Register SGPR = readlaneVGPRToSGPR(SBase->getReg(), MI, MRI);
5043 SBase->setReg(SGPR);
5044 }
5045 MachineOperand *SOff = getNamedOperand(MI, AMDGPU::OpName::soff);
5046 if (SOff && !RI.isSGPRClass(MRI.getRegClass(SOff->getReg()))) {
5047 Register SGPR = readlaneVGPRToSGPR(SOff->getReg(), MI, MRI);
5048 SOff->setReg(SGPR);
5049 }
5050}
5051
5052bool SIInstrInfo::moveFlatAddrToVGPR(MachineInstr &Inst) const {
5053 unsigned Opc = Inst.getOpcode();
5054 int OldSAddrIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::saddr);
5055 if (OldSAddrIdx < 0)
5056 return false;
5057
5058 assert(isSegmentSpecificFLAT(Inst))((void)0);
5059
5060 int NewOpc = AMDGPU::getGlobalVaddrOp(Opc);
5061 if (NewOpc < 0)
5062 NewOpc = AMDGPU::getFlatScratchInstSVfromSS(Opc);
5063 if (NewOpc < 0)
5064 return false;
5065
5066 MachineRegisterInfo &MRI = Inst.getMF()->getRegInfo();
5067 MachineOperand &SAddr = Inst.getOperand(OldSAddrIdx);
5068 if (RI.isSGPRReg(MRI, SAddr.getReg()))
5069 return false;
5070
5071 int NewVAddrIdx = AMDGPU::getNamedOperandIdx(NewOpc, AMDGPU::OpName::vaddr);
5072 if (NewVAddrIdx < 0)
5073 return false;
5074
5075 int OldVAddrIdx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vaddr);
5076
5077 // Check vaddr, it shall be zero or absent.
5078 MachineInstr *VAddrDef = nullptr;
5079 if (OldVAddrIdx >= 0) {
5080 MachineOperand &VAddr = Inst.getOperand(OldVAddrIdx);
5081 VAddrDef = MRI.getUniqueVRegDef(VAddr.getReg());
5082 if (!VAddrDef || VAddrDef->getOpcode() != AMDGPU::V_MOV_B32_e32 ||
5083 !VAddrDef->getOperand(1).isImm() ||
5084 VAddrDef->getOperand(1).getImm() != 0)
5085 return false;
5086 }
5087
5088 const MCInstrDesc &NewDesc = get(NewOpc);
5089 Inst.setDesc(NewDesc);
5090
5091 // Callers expect interator to be valid after this call, so modify the
5092 // instruction in place.
5093 if (OldVAddrIdx == NewVAddrIdx) {
5094 MachineOperand &NewVAddr = Inst.getOperand(NewVAddrIdx);
5095 // Clear use list from the old vaddr holding a zero register.
5096 MRI.removeRegOperandFromUseList(&NewVAddr);
5097 MRI.moveOperands(&NewVAddr, &SAddr, 1);
5098 Inst.RemoveOperand(OldSAddrIdx);
5099 // Update the use list with the pointer we have just moved from vaddr to
5100 // saddr poisition. Otherwise new vaddr will be missing from the use list.
5101 MRI.removeRegOperandFromUseList(&NewVAddr);
5102 MRI.addRegOperandToUseList(&NewVAddr);
5103 } else {
5104 assert(OldSAddrIdx == NewVAddrIdx)((void)0);
5105
5106 if (OldVAddrIdx >= 0) {
5107 int NewVDstIn = AMDGPU::getNamedOperandIdx(NewOpc,
5108 AMDGPU::OpName::vdst_in);
5109
5110 // RemoveOperand doesn't try to fixup tied operand indexes at it goes, so
5111 // it asserts. Untie the operands for now and retie them afterwards.
5112 if (NewVDstIn != -1) {
5113 int OldVDstIn = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::vdst_in);
5114 Inst.untieRegOperand(OldVDstIn);
5115 }
5116
5117 Inst.RemoveOperand(OldVAddrIdx);
5118
5119 if (NewVDstIn != -1) {
5120 int NewVDst = AMDGPU::getNamedOperandIdx(NewOpc, AMDGPU::OpName::vdst);
5121 Inst.tieOperands(NewVDst, NewVDstIn);
5122 }
5123 }
5124 }
5125
5126 if (VAddrDef && MRI.use_nodbg_empty(VAddrDef->getOperand(0).getReg()))
5127 VAddrDef->eraseFromParent();
5128
5129 return true;
5130}
5131
5132// FIXME: Remove this when SelectionDAG is obsoleted.
5133void SIInstrInfo::legalizeOperandsFLAT(MachineRegisterInfo &MRI,
5134 MachineInstr &MI) const {
5135 if (!isSegmentSpecificFLAT(MI))
5136 return;
5137
5138 // Fixup SGPR operands in VGPRs. We only select these when the DAG divergence
5139 // thinks they are uniform, so a readfirstlane should be valid.
5140 MachineOperand *SAddr = getNamedOperand(MI, AMDGPU::OpName::saddr);
5141 if (!SAddr || RI.isSGPRClass(MRI.getRegClass(SAddr->getReg())))
5142 return;
5143
5144 if (moveFlatAddrToVGPR(MI))
5145 return;
5146
5147 Register ToSGPR = readlaneVGPRToSGPR(SAddr->getReg(), MI, MRI);
5148 SAddr->setReg(ToSGPR);
5149}
5150
5151void SIInstrInfo::legalizeGenericOperand(MachineBasicBlock &InsertMBB,
5152 MachineBasicBlock::iterator I,
5153 const TargetRegisterClass *DstRC,
5154 MachineOperand &Op,
5155 MachineRegisterInfo &MRI,
5156 const DebugLoc &DL) const {
5157 Register OpReg = Op.getReg();
5158 unsigned OpSubReg = Op.getSubReg();
5159
5160 const TargetRegisterClass *OpRC = RI.getSubClassWithSubReg(
5161 RI.getRegClassForReg(MRI, OpReg), OpSubReg);
5162
5163 // Check if operand is already the correct register class.
5164 if (DstRC == OpRC)
5165 return;
5166
5167 Register DstReg = MRI.createVirtualRegister(DstRC);
5168 MachineInstr *Copy =
5169 BuildMI(InsertMBB, I, DL, get(AMDGPU::COPY), DstReg).add(Op);
5170
5171 Op.setReg(DstReg);
5172 Op.setSubReg(0);
5173
5174 MachineInstr *Def = MRI.getVRegDef(OpReg);
5175 if (!Def)
5176 return;
5177
5178 // Try to eliminate the copy if it is copying an immediate value.
5179 if (Def->isMoveImmediate() && DstRC != &AMDGPU::VReg_1RegClass)
5180 FoldImmediate(*Copy, *Def, OpReg, &MRI);
5181
5182 bool ImpDef = Def->isImplicitDef();
5183 while (!ImpDef && Def && Def->isCopy()) {
5184 if (Def->getOperand(1).getReg().isPhysical())
5185 break;
5186 Def = MRI.getUniqueVRegDef(Def->getOperand(1).getReg());
5187 ImpDef = Def && Def->isImplicitDef();
5188 }
5189 if (!RI.isSGPRClass(DstRC) && !Copy->readsRegister(AMDGPU::EXEC, &RI) &&
5190 !ImpDef)
5191 Copy->addOperand(MachineOperand::CreateReg(AMDGPU::EXEC, false, true));
5192}
5193
5194// Emit the actual waterfall loop, executing the wrapped instruction for each
5195// unique value of \p Rsrc across all lanes. In the best case we execute 1
5196// iteration, in the worst case we execute 64 (once per lane).
5197static void
5198emitLoadSRsrcFromVGPRLoop(const SIInstrInfo &TII, MachineRegisterInfo &MRI,
5199 MachineBasicBlock &OrigBB, MachineBasicBlock &LoopBB,
5200 const DebugLoc &DL, MachineOperand &Rsrc) {
5201 MachineFunction &MF = *OrigBB.getParent();
5202 const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
5203 const SIRegisterInfo *TRI = ST.getRegisterInfo();
5204 unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
5205 unsigned SaveExecOpc =
5206 ST.isWave32() ? AMDGPU::S_AND_SAVEEXEC_B32 : AMDGPU::S_AND_SAVEEXEC_B64;
5207 unsigned XorTermOpc =
5208 ST.isWave32() ? AMDGPU::S_XOR_B32_term : AMDGPU::S_XOR_B64_term;
5209 unsigned AndOpc =
5210 ST.isWave32() ? AMDGPU::S_AND_B32 : AMDGPU::S_AND_B64;
5211 const auto *BoolXExecRC = TRI->getRegClass(AMDGPU::SReg_1_XEXECRegClassID);
5212
5213 MachineBasicBlock::iterator I = LoopBB.begin();
5214
5215 SmallVector<Register, 8> ReadlanePieces;
5216 Register CondReg = AMDGPU::NoRegister;
5217
5218 Register VRsrc = Rsrc.getReg();
5219 unsigned VRsrcUndef = getUndefRegState(Rsrc.isUndef());
5220
5221 unsigned RegSize = TRI->getRegSizeInBits(Rsrc.getReg(), MRI);
5222 unsigned NumSubRegs = RegSize / 32;
5223 assert(NumSubRegs % 2 == 0 && NumSubRegs <= 32 && "Unhandled register size")((void)0);
5224
5225 for (unsigned Idx = 0; Idx < NumSubRegs; Idx += 2) {
5226
5227 Register CurRegLo = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
5228 Register CurRegHi = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
5229
5230 // Read the next variant <- also loop target.
5231 BuildMI(LoopBB, I, DL, TII.get(AMDGPU::V_READFIRSTLANE_B32), CurRegLo)
5232 .addReg(VRsrc, VRsrcUndef, TRI->getSubRegFromChannel(Idx));
5233
5234 // Read the next variant <- also loop target.
5235 BuildMI(LoopBB, I, DL, TII.get(AMDGPU::V_READFIRSTLANE_B32), CurRegHi)
5236 .addReg(VRsrc, VRsrcUndef, TRI->getSubRegFromChannel(Idx + 1));
5237
5238 ReadlanePieces.push_back(CurRegLo);
5239 ReadlanePieces.push_back(CurRegHi);
5240
5241 // Comparison is to be done as 64-bit.
5242 Register CurReg = MRI.createVirtualRegister(&AMDGPU::SGPR_64RegClass);
5243 BuildMI(LoopBB, I, DL, TII.get(AMDGPU::REG_SEQUENCE), CurReg)
5244 .addReg(CurRegLo)
5245 .addImm(AMDGPU::sub0)
5246 .addReg(CurRegHi)
5247 .addImm(AMDGPU::sub1);
5248
5249 Register NewCondReg = MRI.createVirtualRegister(BoolXExecRC);
5250 auto Cmp =
5251 BuildMI(LoopBB, I, DL, TII.get(AMDGPU::V_CMP_EQ_U64_e64), NewCondReg)
5252 .addReg(CurReg);
5253 if (NumSubRegs <= 2)
5254 Cmp.addReg(VRsrc);
5255 else
5256 Cmp.addReg(VRsrc, VRsrcUndef, TRI->getSubRegFromChannel(Idx, 2));
5257
5258 // Combine the comparision results with AND.
5259 if (CondReg == AMDGPU::NoRegister) // First.
5260 CondReg = NewCondReg;
5261 else { // If not the first, we create an AND.
5262 Register AndReg = MRI.createVirtualRegister(BoolXExecRC);
5263 BuildMI(LoopBB, I, DL, TII.get(AndOpc), AndReg)
5264 .addReg(CondReg)
5265 .addReg(NewCondReg);
5266 CondReg = AndReg;
5267 }
5268 } // End for loop.
5269
5270 auto SRsrcRC = TRI->getEquivalentSGPRClass(MRI.getRegClass(VRsrc));
5271 Register SRsrc = MRI.createVirtualRegister(SRsrcRC);
5272
5273 // Build scalar Rsrc.
5274 auto Merge = BuildMI(LoopBB, I, DL, TII.get(AMDGPU::REG_SEQUENCE), SRsrc);
5275 unsigned Channel = 0;
5276 for (Register Piece : ReadlanePieces) {
5277 Merge.addReg(Piece)
5278 .addImm(TRI->getSubRegFromChannel(Channel++));
5279 }
5280
5281 // Update Rsrc operand to use the SGPR Rsrc.
5282 Rsrc.setReg(SRsrc);
5283 Rsrc.setIsKill(true);
5284
5285 Register SaveExec = MRI.createVirtualRegister(BoolXExecRC);
5286 MRI.setSimpleHint(SaveExec, CondReg);
5287
5288 // Update EXEC to matching lanes, saving original to SaveExec.
5289 BuildMI(LoopBB, I, DL, TII.get(SaveExecOpc), SaveExec)
5290 .addReg(CondReg, RegState::Kill);
5291
5292 // The original instruction is here; we insert the terminators after it.
5293 I = LoopBB.end();
5294
5295 // Update EXEC, switch all done bits to 0 and all todo bits to 1.
5296 BuildMI(LoopBB, I, DL, TII.get(XorTermOpc), Exec)
5297 .addReg(Exec)
5298 .addReg(SaveExec);
5299
5300 BuildMI(LoopBB, I, DL, TII.get(AMDGPU::SI_WATERFALL_LOOP)).addMBB(&LoopBB);
5301}
5302
5303// Build a waterfall loop around \p MI, replacing the VGPR \p Rsrc register
5304// with SGPRs by iterating over all unique values across all lanes.
5305// Returns the loop basic block that now contains \p MI.
5306static MachineBasicBlock *
5307loadSRsrcFromVGPR(const SIInstrInfo &TII, MachineInstr &MI,
5308 MachineOperand &Rsrc, MachineDominatorTree *MDT,
5309 MachineBasicBlock::iterator Begin = nullptr,
5310 MachineBasicBlock::iterator End = nullptr) {
5311 MachineBasicBlock &MBB = *MI.getParent();
5312 MachineFunction &MF = *MBB.getParent();
5313 const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
5314 const SIRegisterInfo *TRI = ST.getRegisterInfo();
5315 MachineRegisterInfo &MRI = MF.getRegInfo();
5316 if (!Begin.isValid())
5317 Begin = &MI;
5318 if (!End.isValid()) {
5319 End = &MI;
5320 ++End;
5321 }
5322 const DebugLoc &DL = MI.getDebugLoc();
5323 unsigned Exec = ST.isWave32() ? AMDGPU::EXEC_LO : AMDGPU::EXEC;
5324 unsigned MovExecOpc = ST.isWave32() ? AMDGPU::S_MOV_B32 : AMDGPU::S_MOV_B64;
5325 const auto *BoolXExecRC = TRI->getRegClass(AMDGPU::SReg_1_XEXECRegClassID);
5326
5327 Register SaveExec = MRI.createVirtualRegister(BoolXExecRC);
5328
5329 // Save the EXEC mask
5330 BuildMI(MBB, Begin, DL, TII.get(MovExecOpc), SaveExec).addReg(Exec);
5331
5332 // Killed uses in the instruction we are waterfalling around will be
5333 // incorrect due to the added control-flow.
5334 MachineBasicBlock::iterator AfterMI = MI;
5335 ++AfterMI;
5336 for (auto I = Begin; I != AfterMI; I++) {
5337 for (auto &MO : I->uses()) {
5338 if (MO.isReg() && MO.isUse()) {
5339 MRI.clearKillFlags(MO.getReg());
5340 }
5341 }
5342 }
5343
5344 // To insert the loop we need to split the block. Move everything after this
5345 // point to a new block, and insert a new empty block between the two.
5346 MachineBasicBlock *LoopBB = MF.CreateMachineBasicBlock();
5347 MachineBasicBlock *RemainderBB = MF.CreateMachineBasicBlock();
5348 MachineFunction::iterator MBBI(MBB);
5349 ++MBBI;
5350
5351 MF.insert(MBBI, LoopBB);
5352 MF.insert(MBBI, RemainderBB);
5353
5354 LoopBB->addSuccessor(LoopBB);
5355 LoopBB->addSuccessor(RemainderBB);
5356
5357 // Move Begin to MI to the LoopBB, and the remainder of the block to
5358 // RemainderBB.
5359 RemainderBB->transferSuccessorsAndUpdatePHIs(&MBB);
5360 RemainderBB->splice(RemainderBB->begin(), &MBB, End, MBB.end());
5361 LoopBB->splice(LoopBB->begin(), &MBB, Begin, MBB.end());
5362
5363 MBB.addSuccessor(LoopBB);
5364
5365 // Update dominators. We know that MBB immediately dominates LoopBB, that
5366 // LoopBB immediately dominates RemainderBB, and that RemainderBB immediately
5367 // dominates all of the successors transferred to it from MBB that MBB used
5368 // to properly dominate.
5369 if (MDT) {
5370 MDT->addNewBlock(LoopBB, &MBB);
5371 MDT->addNewBlock(RemainderBB, LoopBB);
5372 for (auto &Succ : RemainderBB->successors()) {
5373 if (MDT->properlyDominates(&MBB, Succ)) {
5374 MDT->changeImmediateDominator(Succ, RemainderBB);
5375 }
5376 }
5377 }
5378
5379 emitLoadSRsrcFromVGPRLoop(TII, MRI, MBB, *LoopBB, DL, Rsrc);
5380
5381 // Restore the EXEC mask
5382 MachineBasicBlock::iterator First = RemainderBB->begin();
5383 BuildMI(*RemainderBB, First, DL, TII.get(MovExecOpc), Exec).addReg(SaveExec);
5384 return LoopBB;
5385}
5386
5387// Extract pointer from Rsrc and return a zero-value Rsrc replacement.
5388static std::tuple<unsigned, unsigned>
5389extractRsrcPtr(const SIInstrInfo &TII, MachineInstr &MI, MachineOperand &Rsrc) {
5390 MachineBasicBlock &MBB = *MI.getParent();
5391 MachineFunction &MF = *MBB.getParent();
5392 MachineRegisterInfo &MRI = MF.getRegInfo();
5393
5394 // Extract the ptr from the resource descriptor.
5395 unsigned RsrcPtr =
5396 TII.buildExtractSubReg(MI, MRI, Rsrc, &AMDGPU::VReg_128RegClass,
5397 AMDGPU::sub0_sub1, &AMDGPU::VReg_64RegClass);
5398
5399 // Create an empty resource descriptor
5400 Register Zero64 = MRI.createVirtualRegister(&AMDGPU::SReg_64RegClass);
5401 Register SRsrcFormatLo = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
5402 Register SRsrcFormatHi = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass);
5403 Register NewSRsrc = MRI.createVirtualRegister(&AMDGPU::SGPR_128RegClass);
5404 uint64_t RsrcDataFormat = TII.getDefaultRsrcDataFormat();
5405
5406 // Zero64 = 0
5407 BuildMI(MBB, MI, MI.getDebugLoc(), TII.get(AMDGPU::S_MOV_B64), Zero64)
5408 .addImm(0);
5409
5410 // SRsrcFormatLo = RSRC_DATA_FORMAT{31-0}
5411 BuildMI(MBB, MI, MI.getDebugLoc(), TII.get(AMDGPU::S_MOV_B32), SRsrcFormatLo)
5412 .addImm(RsrcDataFormat & 0xFFFFFFFF);
5413
5414 // SRsrcFormatHi = RSRC_DATA_FORMAT{63-32}
5415 BuildMI(MBB, MI, MI.getDebugLoc(), TII.get(AMDGPU::S_MOV_B32), SRsrcFormatHi)
5416 .addImm(RsrcDataFormat >> 32);
5417
5418 // NewSRsrc = {Zero64, SRsrcFormat}
5419 BuildMI(MBB, MI, MI.getDebugLoc(), TII.get(AMDGPU::REG_SEQUENCE), NewSRsrc)
5420 .addReg(Zero64)
5421 .addImm(AMDGPU::sub0_sub1)
5422 .addReg(SRsrcFormatLo)
5423 .addImm(AMDGPU::sub2)
5424 .addReg(SRsrcFormatHi)
5425 .addImm(AMDGPU::sub3);
5426
5427 return std::make_tuple(RsrcPtr, NewSRsrc);
5428}
5429
5430MachineBasicBlock *
5431SIInstrInfo::legalizeOperands(MachineInstr &MI,
5432 MachineDominatorTree *MDT) const {
5433 MachineFunction &MF = *MI.getParent()->getParent();
5434 MachineRegisterInfo &MRI = MF.getRegInfo();
5435 MachineBasicBlock *CreatedBB = nullptr;
5436
5437 // Legalize VOP2
5438 if (isVOP2(MI) || isVOPC(MI)) {
5439 legalizeOperandsVOP2(MRI, MI);
5440 return CreatedBB;
5441 }
5442
5443 // Legalize VOP3
5444 if (isVOP3(MI)) {
5445 legalizeOperandsVOP3(MRI, MI);
5446 return CreatedBB;
5447 }
5448
5449 // Legalize SMRD
5450 if (isSMRD(MI)) {
5451 legalizeOperandsSMRD(MRI, MI);
5452 return CreatedBB;
5453 }
5454
5455 // Legalize FLAT
5456 if (isFLAT(MI)) {
5457 legalizeOperandsFLAT(MRI, MI);
5458 return CreatedBB;
5459 }
5460
5461 // Legalize REG_SEQUENCE and PHI
5462 // The register class of the operands much be the same type as the register
5463 // class of the output.
5464 if (MI.getOpcode() == AMDGPU::PHI) {
5465 const TargetRegisterClass *RC = nullptr, *SRC = nullptr, *VRC = nullptr;
5466 for (unsigned i = 1, e = MI.getNumOperands(); i != e; i += 2) {
5467 if (!MI.getOperand(i).isReg() || !MI.getOperand(i).getReg().isVirtual())
5468 continue;
5469 const TargetRegisterClass *OpRC =
5470 MRI.getRegClass(MI.getOperand(i).getReg());
5471 if (RI.hasVectorRegisters(OpRC)) {
5472 VRC = OpRC;
5473 } else {
5474 SRC = OpRC;
5475 }
5476 }
5477
5478 // If any of the operands are VGPR registers, then they all most be
5479 // otherwise we will create illegal VGPR->SGPR copies when legalizing
5480 // them.
5481 if (VRC || !RI.isSGPRClass(getOpRegClass(MI, 0))) {
5482 if (!VRC) {
5483 assert(SRC)((void)0);
5484 if (getOpRegClass(MI, 0) == &AMDGPU::VReg_1RegClass) {
5485 VRC = &AMDGPU::VReg_1RegClass;
5486 } else
5487 VRC = RI.hasAGPRs(getOpRegClass(MI, 0))
5488 ? RI.getEquivalentAGPRClass(SRC)
5489 : RI.getEquivalentVGPRClass(SRC);
5490 } else {
5491 VRC = RI.hasAGPRs(getOpRegClass(MI, 0))
5492 ? RI.getEquivalentAGPRClass(VRC)
5493 : RI.getEquivalentVGPRClass(VRC);
5494 }
5495 RC = VRC;
5496 } else {
5497 RC = SRC;
5498 }
5499
5500 // Update all the operands so they have the same type.
5501 for (unsigned I = 1, E = MI.getNumOperands(); I != E; I += 2) {
5502 MachineOperand &Op = MI.getOperand(I);
5503 if (!Op.isReg() || !Op.getReg().isVirtual())
5504 continue;
5505
5506 // MI is a PHI instruction.
5507 MachineBasicBlock *InsertBB = MI.getOperand(I + 1).getMBB();
5508 MachineBasicBlock::iterator Insert = InsertBB->getFirstTerminator();
5509
5510 // Avoid creating no-op copies with the same src and dst reg class. These
5511 // confuse some of the machine passes.
5512 legalizeGenericOperand(*InsertBB, Insert, RC, Op, MRI, MI.getDebugLoc());
5513 }
5514 }
5515
5516 // REG_SEQUENCE doesn't really require operand legalization, but if one has a
5517 // VGPR dest type and SGPR sources, insert copies so all operands are
5518 // VGPRs. This seems to help operand folding / the register coalescer.
5519 if (MI.getOpcode() == AMDGPU::REG_SEQUENCE) {
5520 MachineBasicBlock *MBB = MI.getParent();
5521 const TargetRegisterClass *DstRC = getOpRegClass(MI, 0);
5522 if (RI.hasVGPRs(DstRC)) {
5523 // Update all the operands so they are VGPR register classes. These may
5524 // not be the same register class because REG_SEQUENCE supports mixing
5525 // subregister index types e.g. sub0_sub1 + sub2 + sub3
5526 for (unsigned I = 1, E = MI.getNumOperands(); I != E; I += 2) {
5527 MachineOperand &Op = MI.getOperand(I);
5528 if (!Op.isReg() || !Op.getReg().isVirtual())
5529 continue;
5530
5531 const TargetRegisterClass *OpRC = MRI.getRegClass(Op.getReg());
5532 const TargetRegisterClass *VRC = RI.getEquivalentVGPRClass(OpRC);
5533 if (VRC == OpRC)
5534 continue;
5535
5536 legalizeGenericOperand(*MBB, MI, VRC, Op, MRI, MI.getDebugLoc());
5537 Op.setIsKill();
5538 }
5539 }
5540
5541 return CreatedBB;
5542 }
5543
5544 // Legalize INSERT_SUBREG
5545 // src0 must have the same register class as dst
5546 if (MI.getOpcode() == AMDGPU::INSERT_SUBREG) {
5547 Register Dst = MI.getOperand(0).getReg();
5548 Register Src0 = MI.getOperand(1).getReg();
5549 const TargetRegisterClass *DstRC = MRI.getRegClass(Dst);
5550 const TargetRegisterClass *Src0RC = MRI.getRegClass(Src0);
5551 if (DstRC != Src0RC) {
5552 MachineBasicBlock *MBB = MI.getParent();
5553 MachineOperand &Op = MI.getOperand(1);
5554 legalizeGenericOperand(*MBB, MI, DstRC, Op, MRI, MI.getDebugLoc());
5555 }
5556 return CreatedBB;
5557 }
5558
5559 // Legalize SI_INIT_M0
5560 if (MI.getOpcode() == AMDGPU::SI_INIT_M0) {
5561 MachineOperand &Src = MI.getOperand(0);
5562 if (Src.isReg() && RI.hasVectorRegisters(MRI.getRegClass(Src.getReg())))
5563 Src.setReg(readlaneVGPRToSGPR(Src.getReg(), MI, MRI));
5564 return CreatedBB;
5565 }
5566
5567 // Legalize MIMG and MUBUF/MTBUF for shaders.
5568 //
5569 // Shaders only generate MUBUF/MTBUF instructions via intrinsics or via
5570 // scratch memory access. In both cases, the legalization never involves
5571 // conversion to the addr64 form.
5572 if (isMIMG(MI) || (AMDGPU::isGraphics(MF.getFunction().getCallingConv()) &&
5573 (isMUBUF(MI) || isMTBUF(MI)))) {
5574 MachineOperand *SRsrc = getNamedOperand(MI, AMDGPU::OpName::srsrc);
5575 if (SRsrc && !RI.isSGPRClass(MRI.getRegClass(SRsrc->getReg())))
5576 CreatedBB = loadSRsrcFromVGPR(*this, MI, *SRsrc, MDT);
5577
5578 MachineOperand *SSamp = getNamedOperand(MI, AMDGPU::OpName::ssamp);
5579 if (SSamp && !RI.isSGPRClass(MRI.getRegClass(SSamp->getReg())))
5580 CreatedBB = loadSRsrcFromVGPR(*this, MI, *SSamp, MDT);
5581
5582 return CreatedBB;
5583 }
5584
5585 // Legalize SI_CALL
5586 if (MI.getOpcode() == AMDGPU::SI_CALL_ISEL) {
5587 MachineOperand *Dest = &MI.getOperand(0);
5588 if (!RI.isSGPRClass(MRI.getRegClass(Dest->getReg()))) {
5589 // Move everything between ADJCALLSTACKUP and ADJCALLSTACKDOWN and
5590 // following copies, we also need to move copies from and to physical
5591 // registers into the loop block.
5592 unsigned FrameSetupOpcode = getCallFrameSetupOpcode();
5593 unsigned FrameDestroyOpcode = getCallFrameDestroyOpcode();
5594
5595 // Also move the copies to physical registers into the loop block
5596 MachineBasicBlock &MBB = *MI.getParent();
5597 MachineBasicBlock::iterator Start(&MI);
5598 while (Start->getOpcode() != FrameSetupOpcode)
5599 --Start;
5600 MachineBasicBlock::iterator End(&MI);
5601 while (End->getOpcode() != FrameDestroyOpcode)
5602 ++End;
5603 // Also include following copies of the return value
5604 ++End;
5605 while (End != MBB.end() && End->isCopy() && End->getOperand(1).isReg() &&
5606 MI.definesRegister(End->getOperand(1).getReg()))
5607 ++End;
5608 CreatedBB = loadSRsrcFromVGPR(*this, MI, *Dest, MDT, Start, End);
5609 }
5610 }
5611
5612 // Legalize MUBUF* instructions.
5613 int RsrcIdx =
5614 AMDGPU::getNamedOperandIdx(MI.getOpcode(), AMDGPU::OpName::srsrc);
5615 if (RsrcIdx != -1) {
5616 // We have an MUBUF instruction
5617 MachineOperand *Rsrc = &MI.getOperand(RsrcIdx);
5618 unsigned RsrcRC = get(MI.getOpcode()).OpInfo[RsrcIdx].RegClass;
5619 if (RI.getCommonSubClass(MRI.getRegClass(Rsrc->getReg()),
5620 RI.getRegClass(RsrcRC))) {
5621 // The operands are legal.
5622 // FIXME: We may need to legalize operands besided srsrc.
5623 return CreatedBB;
5624 }
5625
5626 // Legalize a VGPR Rsrc.
5627 //
5628 // If the instruction is _ADDR64, we can avoid a waterfall by extracting
5629 // the base pointer from the VGPR Rsrc, adding it to the VAddr, then using
5630 // a zero-value SRsrc.
5631 //
5632 // If the instruction is _OFFSET (both idxen and offen disabled), and we
5633 // support ADDR64 instructions, we can convert to ADDR64 and do the same as
5634 // above.
5635 //
5636 // Otherwise we are on non-ADDR64 hardware, and/or we have
5637 // idxen/offen/bothen and we fall back to a waterfall loop.
5638
5639 MachineBasicBlock &MBB = *MI.getParent();
5640
5641 MachineOperand *VAddr = getNamedOperand(MI, AMDGPU::OpName::vaddr);
5642 if (VAddr && AMDGPU::getIfAddr64Inst(MI.getOpcode()) != -1) {
5643 // This is already an ADDR64 instruction so we need to add the pointer
5644 // extracted from the resource descriptor to the current value of VAddr.
5645 Register NewVAddrLo = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
5646 Register NewVAddrHi = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
5647 Register NewVAddr = MRI.createVirtualRegister(&AMDGPU::VReg_64RegClass);
5648
5649 const auto *BoolXExecRC = RI.getRegClass(AMDGPU::SReg_1_XEXECRegClassID);
5650 Register CondReg0 = MRI.createVirtualRegister(BoolXExecRC);
5651 Register CondReg1 = MRI.createVirtualRegister(BoolXExecRC);
5652
5653 unsigned RsrcPtr, NewSRsrc;
5654 std::tie(RsrcPtr, NewSRsrc) = extractRsrcPtr(*this, MI, *Rsrc);
5655
5656 // NewVaddrLo = RsrcPtr:sub0 + VAddr:sub0
5657 const DebugLoc &DL = MI.getDebugLoc();
5658 BuildMI(MBB, MI, DL, get(AMDGPU::V_ADD_CO_U32_e64), NewVAddrLo)
5659 .addDef(CondReg0)
5660 .addReg(RsrcPtr, 0, AMDGPU::sub0)
5661 .addReg(VAddr->getReg(), 0, AMDGPU::sub0)
5662 .addImm(0);
5663
5664 // NewVaddrHi = RsrcPtr:sub1 + VAddr:sub1
5665 BuildMI(MBB, MI, DL, get(AMDGPU::V_ADDC_U32_e64), NewVAddrHi)
5666 .addDef(CondReg1, RegState::Dead)
5667 .addReg(RsrcPtr, 0, AMDGPU::sub1)
5668 .addReg(VAddr->getReg(), 0, AMDGPU::sub1)
5669 .addReg(CondReg0, RegState::Kill)
5670 .addImm(0);
5671
5672 // NewVaddr = {NewVaddrHi, NewVaddrLo}
5673 BuildMI(MBB, MI, MI.getDebugLoc(), get(AMDGPU::REG_SEQUENCE), NewVAddr)
5674 .addReg(NewVAddrLo)
5675 .addImm(AMDGPU::sub0)
5676 .addReg(NewVAddrHi)
5677 .addImm(AMDGPU::sub1);
5678
5679 VAddr->setReg(NewVAddr);
5680 Rsrc->setReg(NewSRsrc);
5681 } else if (!VAddr && ST.hasAddr64()) {
5682 // This instructions is the _OFFSET variant, so we need to convert it to
5683 // ADDR64.
5684 assert(ST.getGeneration() < AMDGPUSubtarget::VOLCANIC_ISLANDS &&((void)0)
5685 "FIXME: Need to emit flat atomics here")((void)0);
5686
5687 unsigned RsrcPtr, NewSRsrc;
5688 std::tie(RsrcPtr, NewSRsrc) = extractRsrcPtr(*this, MI, *Rsrc);
5689
5690 Register NewVAddr = MRI.createVirtualRegister(&AMDGPU::VReg_64RegClass);
5691 MachineOperand *VData = getNamedOperand(MI, AMDGPU::OpName::vdata);
5692 MachineOperand *Offset = getNamedOperand(MI, AMDGPU::OpName::offset);
5693 MachineOperand *SOffset = getNamedOperand(MI, AMDGPU::OpName::soffset);
5694 unsigned Addr64Opcode = AMDGPU::getAddr64Inst(MI.getOpcode());
5695
5696 // Atomics rith return have have an additional tied operand and are
5697 // missing some of the special bits.
5698 MachineOperand *VDataIn = getNamedOperand(MI, AMDGPU::OpName::vdata_in);
5699 MachineInstr *Addr64;
5700
5701 if (!VDataIn) {
5702 // Regular buffer load / store.
5703 MachineInstrBuilder MIB =
5704 BuildMI(MBB, MI, MI.getDebugLoc(), get(Addr64Opcode))
5705 .add(*VData)
5706 .addReg(NewVAddr)
5707 .addReg(NewSRsrc)
5708 .add(*SOffset)
5709 .add(*Offset);
5710
5711 if (const MachineOperand *CPol =
5712 getNamedOperand(MI, AMDGPU::OpName::cpol)) {
5713 MIB.addImm(CPol->getImm());
5714 }
5715
5716 if (const MachineOperand *TFE =
5717 getNamedOperand(MI, AMDGPU::OpName::tfe)) {
5718 MIB.addImm(TFE->getImm());
5719 }
5720
5721 MIB.addImm(getNamedImmOperand(MI, AMDGPU::OpName::swz));
5722
5723 MIB.cloneMemRefs(MI);
5724 Addr64 = MIB;
5725 } else {
5726 // Atomics with return.
5727 Addr64 = BuildMI(MBB, MI, MI.getDebugLoc(), get(Addr64Opcode))
5728 .add(*VData)
5729 .add(*VDataIn)
5730 .addReg(NewVAddr)
5731 .addReg(NewSRsrc)
5732 .add(*SOffset)
5733 .add(*Offset)
5734 .addImm(getNamedImmOperand(MI, AMDGPU::OpName::cpol))
5735 .cloneMemRefs(MI);
5736 }
5737
5738 MI.removeFromParent();
5739
5740 // NewVaddr = {NewVaddrHi, NewVaddrLo}
5741 BuildMI(MBB, Addr64, Addr64->getDebugLoc(), get(AMDGPU::REG_SEQUENCE),
5742 NewVAddr)
5743 .addReg(RsrcPtr, 0, AMDGPU::sub0)
5744 .addImm(AMDGPU::sub0)
5745 .addReg(RsrcPtr, 0, AMDGPU::sub1)
5746 .addImm(AMDGPU::sub1);
5747 } else {
5748 // This is another variant; legalize Rsrc with waterfall loop from VGPRs
5749 // to SGPRs.
5750 CreatedBB = loadSRsrcFromVGPR(*this, MI, *Rsrc, MDT);
5751 return CreatedBB;
5752 }
5753 }
5754 return CreatedBB;
5755}
5756
5757MachineBasicBlock *SIInstrInfo::moveToVALU(MachineInstr &TopInst,
5758 MachineDominatorTree *MDT) const {
5759 SetVectorType Worklist;
5760 Worklist.insert(&TopInst);
5761 MachineBasicBlock *CreatedBB = nullptr;
5762 MachineBasicBlock *CreatedBBTmp = nullptr;
5763
5764 while (!Worklist.empty()) {
5765 MachineInstr &Inst = *Worklist.pop_back_val();
5766 MachineBasicBlock *MBB = Inst.getParent();
5767 MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
5768
5769 unsigned Opcode = Inst.getOpcode();
5770 unsigned NewOpcode = getVALUOp(Inst);
5771
5772 // Handle some special cases
5773 switch (Opcode) {
5774 default:
5775 break;
5776 case AMDGPU::S_ADD_U64_PSEUDO:
5777 case AMDGPU::S_SUB_U64_PSEUDO:
5778 splitScalar64BitAddSub(Worklist, Inst, MDT);
5779 Inst.eraseFromParent();
5780 continue;
5781 case AMDGPU::S_ADD_I32:
5782 case AMDGPU::S_SUB_I32: {
5783 // FIXME: The u32 versions currently selected use the carry.
5784 bool Changed;
5785 std::tie(Changed, CreatedBBTmp) = moveScalarAddSub(Worklist, Inst, MDT);
5786 if (CreatedBBTmp && TopInst.getParent() == CreatedBBTmp)
5787 CreatedBB = CreatedBBTmp;
5788 if (Changed)
5789 continue;
5790
5791 // Default handling
5792 break;
5793 }
5794 case AMDGPU::S_AND_B64:
5795 splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::S_AND_B32, MDT);
5796 Inst.eraseFromParent();
5797 continue;
5798
5799 case AMDGPU::S_OR_B64:
5800 splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::S_OR_B32, MDT);
5801 Inst.eraseFromParent();
5802 continue;
5803
5804 case AMDGPU::S_XOR_B64:
5805 splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::S_XOR_B32, MDT);
5806 Inst.eraseFromParent();
5807 continue;
5808
5809 case AMDGPU::S_NAND_B64:
5810 splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::S_NAND_B32, MDT);
5811 Inst.eraseFromParent();
5812 continue;
5813
5814 case AMDGPU::S_NOR_B64:
5815 splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::S_NOR_B32, MDT);
5816 Inst.eraseFromParent();
5817 continue;
5818
5819 case AMDGPU::S_XNOR_B64:
5820 if (ST.hasDLInsts())
5821 splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::S_XNOR_B32, MDT);
5822 else
5823 splitScalar64BitXnor(Worklist, Inst, MDT);
5824 Inst.eraseFromParent();
5825 continue;
5826
5827 case AMDGPU::S_ANDN2_B64:
5828 splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::S_ANDN2_B32, MDT);
5829 Inst.eraseFromParent();
5830 continue;
5831
5832 case AMDGPU::S_ORN2_B64:
5833 splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::S_ORN2_B32, MDT);
5834 Inst.eraseFromParent();
5835 continue;
5836
5837 case AMDGPU::S_BREV_B64:
5838 splitScalar64BitUnaryOp(Worklist, Inst, AMDGPU::S_BREV_B32, true);
5839 Inst.eraseFromParent();
5840 continue;
5841
5842 case AMDGPU::S_NOT_B64:
5843 splitScalar64BitUnaryOp(Worklist, Inst, AMDGPU::S_NOT_B32);
5844 Inst.eraseFromParent();
5845 continue;
5846
5847 case AMDGPU::S_BCNT1_I32_B64:
5848 splitScalar64BitBCNT(Worklist, Inst);
5849 Inst.eraseFromParent();
5850 continue;
5851
5852 case AMDGPU::S_BFE_I64:
5853 splitScalar64BitBFE(Worklist, Inst);
5854 Inst.eraseFromParent();
5855 continue;
5856
5857 case AMDGPU::S_LSHL_B32:
5858 if (ST.hasOnlyRevVALUShifts()) {
5859 NewOpcode = AMDGPU::V_LSHLREV_B32_e64;
5860 swapOperands(Inst);
5861 }
5862 break;
5863 case AMDGPU::S_ASHR_I32:
5864 if (ST.hasOnlyRevVALUShifts()) {
5865 NewOpcode = AMDGPU::V_ASHRREV_I32_e64;
5866 swapOperands(Inst);
5867 }
5868 break;
5869 case AMDGPU::S_LSHR_B32:
5870 if (ST.hasOnlyRevVALUShifts()) {
5871 NewOpcode = AMDGPU::V_LSHRREV_B32_e64;
5872 swapOperands(Inst);
5873 }
5874 break;
5875 case AMDGPU::S_LSHL_B64:
5876 if (ST.hasOnlyRevVALUShifts()) {
5877 NewOpcode = AMDGPU::V_LSHLREV_B64_e64;
5878 swapOperands(Inst);
5879 }
5880 break;
5881 case AMDGPU::S_ASHR_I64:
5882 if (ST.hasOnlyRevVALUShifts()) {
5883 NewOpcode = AMDGPU::V_ASHRREV_I64_e64;
5884 swapOperands(Inst);
5885 }
5886 break;
5887 case AMDGPU::S_LSHR_B64:
5888 if (ST.hasOnlyRevVALUShifts()) {
5889 NewOpcode = AMDGPU::V_LSHRREV_B64_e64;
5890 swapOperands(Inst);
5891 }
5892 break;
5893
5894 case AMDGPU::S_ABS_I32:
5895 lowerScalarAbs(Worklist, Inst);
5896 Inst.eraseFromParent();
5897 continue;
5898
5899 case AMDGPU::S_CBRANCH_SCC0:
5900 case AMDGPU::S_CBRANCH_SCC1:
5901 // Clear unused bits of vcc
5902 if (ST.isWave32())
5903 BuildMI(*MBB, Inst, Inst.getDebugLoc(), get(AMDGPU::S_AND_B32),
5904 AMDGPU::VCC_LO)
5905 .addReg(AMDGPU::EXEC_LO)
5906 .addReg(AMDGPU::VCC_LO);
5907 else
5908 BuildMI(*MBB, Inst, Inst.getDebugLoc(), get(AMDGPU::S_AND_B64),
5909 AMDGPU::VCC)
5910 .addReg(AMDGPU::EXEC)
5911 .addReg(AMDGPU::VCC);
5912 break;
5913
5914 case AMDGPU::S_BFE_U64:
5915 case AMDGPU::S_BFM_B64:
5916 llvm_unreachable("Moving this op to VALU not implemented")__builtin_unreachable();
5917
5918 case AMDGPU::S_PACK_LL_B32_B16:
5919 case AMDGPU::S_PACK_LH_B32_B16:
5920 case AMDGPU::S_PACK_HH_B32_B16:
5921 movePackToVALU(Worklist, MRI, Inst);
5922 Inst.eraseFromParent();
5923 continue;
5924
5925 case AMDGPU::S_XNOR_B32:
5926 lowerScalarXnor(Worklist, Inst);
5927 Inst.eraseFromParent();
5928 continue;
5929
5930 case AMDGPU::S_NAND_B32:
5931 splitScalarNotBinop(Worklist, Inst, AMDGPU::S_AND_B32);
5932 Inst.eraseFromParent();
5933 continue;
5934
5935 case AMDGPU::S_NOR_B32:
5936 splitScalarNotBinop(Worklist, Inst, AMDGPU::S_OR_B32);
5937 Inst.eraseFromParent();
5938 continue;
5939
5940 case AMDGPU::S_ANDN2_B32:
5941 splitScalarBinOpN2(Worklist, Inst, AMDGPU::S_AND_B32);
5942 Inst.eraseFromParent();
5943 continue;
5944
5945 case AMDGPU::S_ORN2_B32:
5946 splitScalarBinOpN2(Worklist, Inst, AMDGPU::S_OR_B32);
5947 Inst.eraseFromParent();
5948 continue;
5949
5950 // TODO: remove as soon as everything is ready
5951 // to replace VGPR to SGPR copy with V_READFIRSTLANEs.
5952 // S_ADD/SUB_CO_PSEUDO as well as S_UADDO/USUBO_PSEUDO
5953 // can only be selected from the uniform SDNode.
5954 case AMDGPU::S_ADD_CO_PSEUDO:
5955 case AMDGPU::S_SUB_CO_PSEUDO: {
5956 unsigned Opc = (Inst.getOpcode() == AMDGPU::S_ADD_CO_PSEUDO)
5957 ? AMDGPU::V_ADDC_U32_e64
5958 : AMDGPU::V_SUBB_U32_e64;
5959 const auto *CarryRC = RI.getRegClass(AMDGPU::SReg_1_XEXECRegClassID);
5960
5961 Register CarryInReg = Inst.getOperand(4).getReg();
5962 if (!MRI.constrainRegClass(CarryInReg, CarryRC)) {
5963 Register NewCarryReg = MRI.createVirtualRegister(CarryRC);
5964 BuildMI(*MBB, &Inst, Inst.getDebugLoc(), get(AMDGPU::COPY), NewCarryReg)
5965 .addReg(CarryInReg);
5966 }
5967
5968 Register CarryOutReg = Inst.getOperand(1).getReg();
5969
5970 Register DestReg = MRI.createVirtualRegister(RI.getEquivalentVGPRClass(
5971 MRI.getRegClass(Inst.getOperand(0).getReg())));
5972 MachineInstr *CarryOp =
5973 BuildMI(*MBB, &Inst, Inst.getDebugLoc(), get(Opc), DestReg)
5974 .addReg(CarryOutReg, RegState::Define)
5975 .add(Inst.getOperand(2))
5976 .add(Inst.getOperand(3))
5977 .addReg(CarryInReg)
5978 .addImm(0);
5979 CreatedBBTmp = legalizeOperands(*CarryOp);
5980 if (CreatedBBTmp && TopInst.getParent() == CreatedBBTmp)
5981 CreatedBB = CreatedBBTmp;
5982 MRI.replaceRegWith(Inst.getOperand(0).getReg(), DestReg);
5983 addUsersToMoveToVALUWorklist(DestReg, MRI, Worklist);
5984 Inst.eraseFromParent();
5985 }
5986 continue;
5987 case AMDGPU::S_UADDO_PSEUDO:
5988 case AMDGPU::S_USUBO_PSEUDO: {
5989 const DebugLoc &DL = Inst.getDebugLoc();
5990 MachineOperand &Dest0 = Inst.getOperand(0);
5991 MachineOperand &Dest1 = Inst.getOperand(1);
5992 MachineOperand &Src0 = Inst.getOperand(2);
5993 MachineOperand &Src1 = Inst.getOperand(3);
5994
5995 unsigned Opc = (Inst.getOpcode() == AMDGPU::S_UADDO_PSEUDO)
5996 ? AMDGPU::V_ADD_CO_U32_e64
5997 : AMDGPU::V_SUB_CO_U32_e64;
5998 const TargetRegisterClass *NewRC =
5999 RI.getEquivalentVGPRClass(MRI.getRegClass(Dest0.getReg()));
6000 Register DestReg = MRI.createVirtualRegister(NewRC);
6001 MachineInstr *NewInstr = BuildMI(*MBB, &Inst, DL, get(Opc), DestReg)
6002 .addReg(Dest1.getReg(), RegState::Define)
6003 .add(Src0)
6004 .add(Src1)
6005 .addImm(0); // clamp bit
6006
6007 CreatedBBTmp = legalizeOperands(*NewInstr, MDT);
6008 if (CreatedBBTmp && TopInst.getParent() == CreatedBBTmp)
6009 CreatedBB = CreatedBBTmp;
6010
6011 MRI.replaceRegWith(Dest0.getReg(), DestReg);
6012 addUsersToMoveToVALUWorklist(NewInstr->getOperand(0).getReg(), MRI,
6013 Worklist);
6014 Inst.eraseFromParent();
6015 }
6016 continue;
6017
6018 case AMDGPU::S_CSELECT_B32:
6019 case AMDGPU::S_CSELECT_B64:
6020 lowerSelect(Worklist, Inst, MDT);
6021 Inst.eraseFromParent();
6022 continue;
6023 }
6024
6025 if (NewOpcode == AMDGPU::INSTRUCTION_LIST_END) {
6026 // We cannot move this instruction to the VALU, so we should try to
6027 // legalize its operands instead.
6028 CreatedBBTmp = legalizeOperands(Inst, MDT);
6029 if (CreatedBBTmp && TopInst.getParent() == CreatedBBTmp)
6030 CreatedBB = CreatedBBTmp;
6031 continue;
6032 }
6033
6034 // Use the new VALU Opcode.
6035 const MCInstrDesc &NewDesc = get(NewOpcode);
6036 Inst.setDesc(NewDesc);
6037
6038 // Remove any references to SCC. Vector instructions can't read from it, and
6039 // We're just about to add the implicit use / defs of VCC, and we don't want
6040 // both.
6041 for (unsigned i = Inst.getNumOperands() - 1; i > 0; --i) {
6042 MachineOperand &Op = Inst.getOperand(i);
6043 if (Op.isReg() && Op.getReg() == AMDGPU::SCC) {
6044 // Only propagate through live-def of SCC.
6045 if (Op.isDef() && !Op.isDead())
6046 addSCCDefUsersToVALUWorklist(Op, Inst, Worklist);
6047 if (Op.isUse())
6048 addSCCDefsToVALUWorklist(Op, Worklist);
6049 Inst.RemoveOperand(i);
6050 }
6051 }
6052
6053 if (Opcode == AMDGPU::S_SEXT_I32_I8 || Opcode == AMDGPU::S_SEXT_I32_I16) {
6054 // We are converting these to a BFE, so we need to add the missing
6055 // operands for the size and offset.
6056 unsigned Size = (Opcode == AMDGPU::S_SEXT_I32_I8) ? 8 : 16;
6057 Inst.addOperand(MachineOperand::CreateImm(0));
6058 Inst.addOperand(MachineOperand::CreateImm(Size));
6059
6060 } else if (Opcode == AMDGPU::S_BCNT1_I32_B32) {
6061 // The VALU version adds the second operand to the result, so insert an
6062 // extra 0 operand.
6063 Inst.addOperand(MachineOperand::CreateImm(0));
6064 }
6065
6066 Inst.addImplicitDefUseOperands(*Inst.getParent()->getParent());
6067 fixImplicitOperands(Inst);
6068
6069 if (Opcode == AMDGPU::S_BFE_I32 || Opcode == AMDGPU::S_BFE_U32) {
6070 const MachineOperand &OffsetWidthOp = Inst.getOperand(2);
6071 // If we need to move this to VGPRs, we need to unpack the second operand
6072 // back into the 2 separate ones for bit offset and width.
6073 assert(OffsetWidthOp.isImm() &&((void)0)
6074 "Scalar BFE is only implemented for constant width and offset")((void)0);
6075 uint32_t Imm = OffsetWidthOp.getImm();
6076
6077 uint32_t Offset = Imm & 0x3f; // Extract bits [5:0].
6078 uint32_t BitWidth = (Imm & 0x7f0000) >> 16; // Extract bits [22:16].
6079 Inst.RemoveOperand(2); // Remove old immediate.
6080 Inst.addOperand(MachineOperand::CreateImm(Offset));
6081 Inst.addOperand(MachineOperand::CreateImm(BitWidth));
6082 }
6083
6084 bool HasDst = Inst.getOperand(0).isReg() && Inst.getOperand(0).isDef();
6085 unsigned NewDstReg = AMDGPU::NoRegister;
6086 if (HasDst) {
6087 Register DstReg = Inst.getOperand(0).getReg();
6088 if (DstReg.isPhysical())
6089 continue;
6090
6091 // Update the destination register class.
6092 const TargetRegisterClass *NewDstRC = getDestEquivalentVGPRClass(Inst);
6093 if (!NewDstRC)
6094 continue;
6095
6096 if (Inst.isCopy() && Inst.getOperand(1).getReg().isVirtual() &&
6097 NewDstRC == RI.getRegClassForReg(MRI, Inst.getOperand(1).getReg())) {
6098 // Instead of creating a copy where src and dst are the same register
6099 // class, we just replace all uses of dst with src. These kinds of
6100 // copies interfere with the heuristics MachineSink uses to decide
6101 // whether or not to split a critical edge. Since the pass assumes
6102 // that copies will end up as machine instructions and not be
6103 // eliminated.
6104 addUsersToMoveToVALUWorklist(DstReg, MRI, Worklist);
6105 MRI.replaceRegWith(DstReg, Inst.getOperand(1).getReg());
6106 MRI.clearKillFlags(Inst.getOperand(1).getReg());
6107 Inst.getOperand(0).setReg(DstReg);
6108
6109 // Make sure we don't leave around a dead VGPR->SGPR copy. Normally
6110 // these are deleted later, but at -O0 it would leave a suspicious
6111 // looking illegal copy of an undef register.
6112 for (unsigned I = Inst.getNumOperands() - 1; I != 0; --I)
6113 Inst.RemoveOperand(I);
6114 Inst.setDesc(get(AMDGPU::IMPLICIT_DEF));
6115 continue;
6116 }
6117
6118 NewDstReg = MRI.createVirtualRegister(NewDstRC);
6119 MRI.replaceRegWith(DstReg, NewDstReg);
6120 }
6121
6122 // Legalize the operands
6123 CreatedBBTmp = legalizeOperands(Inst, MDT);
6124 if (CreatedBBTmp && TopInst.getParent() == CreatedBBTmp)
6125 CreatedBB = CreatedBBTmp;
6126
6127 if (HasDst)
6128 addUsersToMoveToVALUWorklist(NewDstReg, MRI, Worklist);
6129 }
6130 return CreatedBB;
6131}
6132
6133// Add/sub require special handling to deal with carry outs.
6134std::pair<bool, MachineBasicBlock *>
6135SIInstrInfo::moveScalarAddSub(SetVectorType &Worklist, MachineInstr &Inst,
6136 MachineDominatorTree *MDT) const {
6137 if (ST.hasAddNoCarry()) {
6138 // Assume there is no user of scc since we don't select this in that case.
6139 // Since scc isn't used, it doesn't really matter if the i32 or u32 variant
6140 // is used.
6141
6142 MachineBasicBlock &MBB = *Inst.getParent();
6143 MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
6144
6145 Register OldDstReg = Inst.getOperand(0).getReg();
6146 Register ResultReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass);
6147
6148 unsigned Opc = Inst.getOpcode();
6149 assert(Opc == AMDGPU::S_ADD_I32 || Opc == AMDGPU::S_SUB_I32)((void)0);
6150
6151 unsigned NewOpc = Opc == AMDGPU::S_ADD_I32 ?
6152 AMDGPU::V_ADD_U32_e64 : AMDGPU::V_SUB_U32_e64;
6153
6154 assert(Inst.getOperand(3).getReg() == AMDGPU::SCC)((void)0);
6155 Inst.RemoveOperand(3);
6156
6157 Inst.setDesc(get(NewOpc));
6158 Inst.addOperand(MachineOperand::CreateImm(0)); // clamp bit
6159 Inst.addImplicitDefUseOperands(*MBB.getParent());
6160 MRI.replaceRegWith(OldDstReg, ResultReg);
6161 MachineBasicBlock *NewBB = legalizeOperands(Inst, MDT);
6162
6163 addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist);
6164 return std::make_pair(true, NewBB);
6165 }
6166
6167 return std::make_pair(false, nullptr);
6168}
6169
6170void SIInstrInfo::lowerSelect(SetVectorType &Worklist, MachineInstr &Inst,
6171 MachineDominatorTree *MDT) const {
6172
6173 MachineBasicBlock &MBB = *Inst.getParent();
6174 MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
6175 MachineBasicBlock::iterator MII = Inst;
6176 DebugLoc DL = Inst.getDebugLoc();
6177
6178 MachineOperand &Dest = Inst.getOperand(0);
6179 MachineOperand &Src0 = Inst.getOperand(1);
6180 MachineOperand &Src1 = Inst.getOperand(2);
6181 MachineOperand &Cond = Inst.getOperand(3);
6182
6183 Register SCCSource = Cond.getReg();
6184 // Find SCC def, and if that is a copy (SCC = COPY reg) then use reg instead.
6185 if (!Cond.isUndef()) {
6186 for (MachineInstr &CandI :
6187 make_range(std::next(MachineBasicBlock::reverse_iterator(Inst)),
6188 Inst.getParent()->rend())) {
6189 if (CandI.findRegisterDefOperandIdx(AMDGPU::SCC, false, false, &RI) !=
6190 -1) {
6191 if (CandI.isCopy() && CandI.getOperand(0).getReg() == AMDGPU::SCC) {
6192 SCCSource = CandI.getOperand(1).getReg();
6193 }
6194 break;
6195 }
6196 }
6197 }
6198
6199 // If this is a trivial select where the condition is effectively not SCC
6200 // (SCCSource is a source of copy to SCC), then the select is semantically
6201 // equivalent to copying SCCSource. Hence, there is no need to create
6202 // V_CNDMASK, we can just use that and bail out.
6203 if ((SCCSource != AMDGPU::SCC) && Src0.isImm() && (Src0.getImm() == -1) &&
6204 Src1.isImm() && (Src1.getImm() == 0)) {
6205 MRI.replaceRegWith(Dest.getReg(), SCCSource);
6206 return;
6207 }
6208
6209 const TargetRegisterClass *TC = ST.getWavefrontSize() == 64
6210 ? &AMDGPU::SReg_64_XEXECRegClass
6211 : &AMDGPU::SReg_32_XM0_XEXECRegClass;
6212 Register CopySCC = MRI.createVirtualRegister(TC);
6213
6214 if (SCCSource == AMDGPU::SCC) {
6215 // Insert a trivial select instead of creating a copy, because a copy from
6216 // SCC would semantically mean just copying a single bit, but we