Bug Summary

File:src/gnu/usr.bin/clang/libLLVM/../../../llvm/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
Warning:line 770, column 32
Division by zero

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 SelectionDAGBuilder.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/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
1//===- SelectionDAGBuilder.cpp - Selection-DAG building -------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This implements routines for translating from LLVM IR into SelectionDAG IR.
10//
11//===----------------------------------------------------------------------===//
12
13#include "SelectionDAGBuilder.h"
14#include "SDNodeDbgValue.h"
15#include "llvm/ADT/APFloat.h"
16#include "llvm/ADT/APInt.h"
17#include "llvm/ADT/BitVector.h"
18#include "llvm/ADT/None.h"
19#include "llvm/ADT/Optional.h"
20#include "llvm/ADT/STLExtras.h"
21#include "llvm/ADT/SmallPtrSet.h"
22#include "llvm/ADT/SmallSet.h"
23#include "llvm/ADT/StringRef.h"
24#include "llvm/ADT/Triple.h"
25#include "llvm/ADT/Twine.h"
26#include "llvm/Analysis/AliasAnalysis.h"
27#include "llvm/Analysis/BlockFrequencyInfo.h"
28#include "llvm/Analysis/BranchProbabilityInfo.h"
29#include "llvm/Analysis/ConstantFolding.h"
30#include "llvm/Analysis/EHPersonalities.h"
31#include "llvm/Analysis/Loads.h"
32#include "llvm/Analysis/MemoryLocation.h"
33#include "llvm/Analysis/ProfileSummaryInfo.h"
34#include "llvm/Analysis/TargetLibraryInfo.h"
35#include "llvm/Analysis/ValueTracking.h"
36#include "llvm/Analysis/VectorUtils.h"
37#include "llvm/CodeGen/Analysis.h"
38#include "llvm/CodeGen/FunctionLoweringInfo.h"
39#include "llvm/CodeGen/GCMetadata.h"
40#include "llvm/CodeGen/MachineBasicBlock.h"
41#include "llvm/CodeGen/MachineFrameInfo.h"
42#include "llvm/CodeGen/MachineFunction.h"
43#include "llvm/CodeGen/MachineInstr.h"
44#include "llvm/CodeGen/MachineInstrBuilder.h"
45#include "llvm/CodeGen/MachineJumpTableInfo.h"
46#include "llvm/CodeGen/MachineMemOperand.h"
47#include "llvm/CodeGen/MachineModuleInfo.h"
48#include "llvm/CodeGen/MachineOperand.h"
49#include "llvm/CodeGen/MachineRegisterInfo.h"
50#include "llvm/CodeGen/RuntimeLibcalls.h"
51#include "llvm/CodeGen/SelectionDAG.h"
52#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
53#include "llvm/CodeGen/StackMaps.h"
54#include "llvm/CodeGen/SwiftErrorValueTracking.h"
55#include "llvm/CodeGen/TargetFrameLowering.h"
56#include "llvm/CodeGen/TargetInstrInfo.h"
57#include "llvm/CodeGen/TargetOpcodes.h"
58#include "llvm/CodeGen/TargetRegisterInfo.h"
59#include "llvm/CodeGen/TargetSubtargetInfo.h"
60#include "llvm/CodeGen/WinEHFuncInfo.h"
61#include "llvm/IR/Argument.h"
62#include "llvm/IR/Attributes.h"
63#include "llvm/IR/BasicBlock.h"
64#include "llvm/IR/CFG.h"
65#include "llvm/IR/CallingConv.h"
66#include "llvm/IR/Constant.h"
67#include "llvm/IR/ConstantRange.h"
68#include "llvm/IR/Constants.h"
69#include "llvm/IR/DataLayout.h"
70#include "llvm/IR/DebugInfoMetadata.h"
71#include "llvm/IR/DerivedTypes.h"
72#include "llvm/IR/Function.h"
73#include "llvm/IR/GetElementPtrTypeIterator.h"
74#include "llvm/IR/InlineAsm.h"
75#include "llvm/IR/InstrTypes.h"
76#include "llvm/IR/Instructions.h"
77#include "llvm/IR/IntrinsicInst.h"
78#include "llvm/IR/Intrinsics.h"
79#include "llvm/IR/IntrinsicsAArch64.h"
80#include "llvm/IR/IntrinsicsWebAssembly.h"
81#include "llvm/IR/LLVMContext.h"
82#include "llvm/IR/Metadata.h"
83#include "llvm/IR/Module.h"
84#include "llvm/IR/Operator.h"
85#include "llvm/IR/PatternMatch.h"
86#include "llvm/IR/Statepoint.h"
87#include "llvm/IR/Type.h"
88#include "llvm/IR/User.h"
89#include "llvm/IR/Value.h"
90#include "llvm/MC/MCContext.h"
91#include "llvm/MC/MCSymbol.h"
92#include "llvm/Support/AtomicOrdering.h"
93#include "llvm/Support/Casting.h"
94#include "llvm/Support/CommandLine.h"
95#include "llvm/Support/Compiler.h"
96#include "llvm/Support/Debug.h"
97#include "llvm/Support/MathExtras.h"
98#include "llvm/Support/raw_ostream.h"
99#include "llvm/Target/TargetIntrinsicInfo.h"
100#include "llvm/Target/TargetMachine.h"
101#include "llvm/Target/TargetOptions.h"
102#include "llvm/Transforms/Utils/Local.h"
103#include <cstddef>
104#include <cstring>
105#include <iterator>
106#include <limits>
107#include <numeric>
108#include <tuple>
109
110using namespace llvm;
111using namespace PatternMatch;
112using namespace SwitchCG;
113
114#define DEBUG_TYPE"isel" "isel"
115
116/// LimitFloatPrecision - Generate low-precision inline sequences for
117/// some float libcalls (6, 8 or 12 bits).
118static unsigned LimitFloatPrecision;
119
120static cl::opt<bool>
121 InsertAssertAlign("insert-assert-align", cl::init(true),
122 cl::desc("Insert the experimental `assertalign` node."),
123 cl::ReallyHidden);
124
125static cl::opt<unsigned, true>
126 LimitFPPrecision("limit-float-precision",
127 cl::desc("Generate low-precision inline sequences "
128 "for some float libcalls"),
129 cl::location(LimitFloatPrecision), cl::Hidden,
130 cl::init(0));
131
132static cl::opt<unsigned> SwitchPeelThreshold(
133 "switch-peel-threshold", cl::Hidden, cl::init(66),
134 cl::desc("Set the case probability threshold for peeling the case from a "
135 "switch statement. A value greater than 100 will void this "
136 "optimization"));
137
138// Limit the width of DAG chains. This is important in general to prevent
139// DAG-based analysis from blowing up. For example, alias analysis and
140// load clustering may not complete in reasonable time. It is difficult to
141// recognize and avoid this situation within each individual analysis, and
142// future analyses are likely to have the same behavior. Limiting DAG width is
143// the safe approach and will be especially important with global DAGs.
144//
145// MaxParallelChains default is arbitrarily high to avoid affecting
146// optimization, but could be lowered to improve compile time. Any ld-ld-st-st
147// sequence over this should have been converted to llvm.memcpy by the
148// frontend. It is easy to induce this behavior with .ll code such as:
149// %buffer = alloca [4096 x i8]
150// %data = load [4096 x i8]* %argPtr
151// store [4096 x i8] %data, [4096 x i8]* %buffer
152static const unsigned MaxParallelChains = 64;
153
154static SDValue getCopyFromPartsVector(SelectionDAG &DAG, const SDLoc &DL,
155 const SDValue *Parts, unsigned NumParts,
156 MVT PartVT, EVT ValueVT, const Value *V,
157 Optional<CallingConv::ID> CC);
158
159/// getCopyFromParts - Create a value that contains the specified legal parts
160/// combined into the value they represent. If the parts combine to a type
161/// larger than ValueVT then AssertOp can be used to specify whether the extra
162/// bits are known to be zero (ISD::AssertZext) or sign extended from ValueVT
163/// (ISD::AssertSext).
164static SDValue getCopyFromParts(SelectionDAG &DAG, const SDLoc &DL,
165 const SDValue *Parts, unsigned NumParts,
166 MVT PartVT, EVT ValueVT, const Value *V,
167 Optional<CallingConv::ID> CC = None,
168 Optional<ISD::NodeType> AssertOp = None) {
169 // Let the target assemble the parts if it wants to
170 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
171 if (SDValue Val = TLI.joinRegisterPartsIntoValue(DAG, DL, Parts, NumParts,
172 PartVT, ValueVT, CC))
173 return Val;
174
175 if (ValueVT.isVector())
176 return getCopyFromPartsVector(DAG, DL, Parts, NumParts, PartVT, ValueVT, V,
177 CC);
178
179 assert(NumParts > 0 && "No parts to assemble!")((void)0);
180 SDValue Val = Parts[0];
181
182 if (NumParts > 1) {
183 // Assemble the value from multiple parts.
184 if (ValueVT.isInteger()) {
185 unsigned PartBits = PartVT.getSizeInBits();
186 unsigned ValueBits = ValueVT.getSizeInBits();
187
188 // Assemble the power of 2 part.
189 unsigned RoundParts =
190 (NumParts & (NumParts - 1)) ? 1 << Log2_32(NumParts) : NumParts;
191 unsigned RoundBits = PartBits * RoundParts;
192 EVT RoundVT = RoundBits == ValueBits ?
193 ValueVT : EVT::getIntegerVT(*DAG.getContext(), RoundBits);
194 SDValue Lo, Hi;
195
196 EVT HalfVT = EVT::getIntegerVT(*DAG.getContext(), RoundBits/2);
197
198 if (RoundParts > 2) {
199 Lo = getCopyFromParts(DAG, DL, Parts, RoundParts / 2,
200 PartVT, HalfVT, V);
201 Hi = getCopyFromParts(DAG, DL, Parts + RoundParts / 2,
202 RoundParts / 2, PartVT, HalfVT, V);
203 } else {
204 Lo = DAG.getNode(ISD::BITCAST, DL, HalfVT, Parts[0]);
205 Hi = DAG.getNode(ISD::BITCAST, DL, HalfVT, Parts[1]);
206 }
207
208 if (DAG.getDataLayout().isBigEndian())
209 std::swap(Lo, Hi);
210
211 Val = DAG.getNode(ISD::BUILD_PAIR, DL, RoundVT, Lo, Hi);
212
213 if (RoundParts < NumParts) {
214 // Assemble the trailing non-power-of-2 part.
215 unsigned OddParts = NumParts - RoundParts;
216 EVT OddVT = EVT::getIntegerVT(*DAG.getContext(), OddParts * PartBits);
217 Hi = getCopyFromParts(DAG, DL, Parts + RoundParts, OddParts, PartVT,
218 OddVT, V, CC);
219
220 // Combine the round and odd parts.
221 Lo = Val;
222 if (DAG.getDataLayout().isBigEndian())
223 std::swap(Lo, Hi);
224 EVT TotalVT = EVT::getIntegerVT(*DAG.getContext(), NumParts * PartBits);
225 Hi = DAG.getNode(ISD::ANY_EXTEND, DL, TotalVT, Hi);
226 Hi =
227 DAG.getNode(ISD::SHL, DL, TotalVT, Hi,
228 DAG.getConstant(Lo.getValueSizeInBits(), DL,
229 TLI.getPointerTy(DAG.getDataLayout())));
230 Lo = DAG.getNode(ISD::ZERO_EXTEND, DL, TotalVT, Lo);
231 Val = DAG.getNode(ISD::OR, DL, TotalVT, Lo, Hi);
232 }
233 } else if (PartVT.isFloatingPoint()) {
234 // FP split into multiple FP parts (for ppcf128)
235 assert(ValueVT == EVT(MVT::ppcf128) && PartVT == MVT::f64 &&((void)0)
236 "Unexpected split")((void)0);
237 SDValue Lo, Hi;
238 Lo = DAG.getNode(ISD::BITCAST, DL, EVT(MVT::f64), Parts[0]);
239 Hi = DAG.getNode(ISD::BITCAST, DL, EVT(MVT::f64), Parts[1]);
240 if (TLI.hasBigEndianPartOrdering(ValueVT, DAG.getDataLayout()))
241 std::swap(Lo, Hi);
242 Val = DAG.getNode(ISD::BUILD_PAIR, DL, ValueVT, Lo, Hi);
243 } else {
244 // FP split into integer parts (soft fp)
245 assert(ValueVT.isFloatingPoint() && PartVT.isInteger() &&((void)0)
246 !PartVT.isVector() && "Unexpected split")((void)0);
247 EVT IntVT = EVT::getIntegerVT(*DAG.getContext(), ValueVT.getSizeInBits());
248 Val = getCopyFromParts(DAG, DL, Parts, NumParts, PartVT, IntVT, V, CC);
249 }
250 }
251
252 // There is now one part, held in Val. Correct it to match ValueVT.
253 // PartEVT is the type of the register class that holds the value.
254 // ValueVT is the type of the inline asm operation.
255 EVT PartEVT = Val.getValueType();
256
257 if (PartEVT == ValueVT)
258 return Val;
259
260 if (PartEVT.isInteger() && ValueVT.isFloatingPoint() &&
261 ValueVT.bitsLT(PartEVT)) {
262 // For an FP value in an integer part, we need to truncate to the right
263 // width first.
264 PartEVT = EVT::getIntegerVT(*DAG.getContext(), ValueVT.getSizeInBits());
265 Val = DAG.getNode(ISD::TRUNCATE, DL, PartEVT, Val);
266 }
267
268 // Handle types that have the same size.
269 if (PartEVT.getSizeInBits() == ValueVT.getSizeInBits())
270 return DAG.getNode(ISD::BITCAST, DL, ValueVT, Val);
271
272 // Handle types with different sizes.
273 if (PartEVT.isInteger() && ValueVT.isInteger()) {
274 if (ValueVT.bitsLT(PartEVT)) {
275 // For a truncate, see if we have any information to
276 // indicate whether the truncated bits will always be
277 // zero or sign-extension.
278 if (AssertOp.hasValue())
279 Val = DAG.getNode(*AssertOp, DL, PartEVT, Val,
280 DAG.getValueType(ValueVT));
281 return DAG.getNode(ISD::TRUNCATE, DL, ValueVT, Val);
282 }
283 return DAG.getNode(ISD::ANY_EXTEND, DL, ValueVT, Val);
284 }
285
286 if (PartEVT.isFloatingPoint() && ValueVT.isFloatingPoint()) {
287 // FP_ROUND's are always exact here.
288 if (ValueVT.bitsLT(Val.getValueType()))
289 return DAG.getNode(
290 ISD::FP_ROUND, DL, ValueVT, Val,
291 DAG.getTargetConstant(1, DL, TLI.getPointerTy(DAG.getDataLayout())));
292
293 return DAG.getNode(ISD::FP_EXTEND, DL, ValueVT, Val);
294 }
295
296 // Handle MMX to a narrower integer type by bitcasting MMX to integer and
297 // then truncating.
298 if (PartEVT == MVT::x86mmx && ValueVT.isInteger() &&
299 ValueVT.bitsLT(PartEVT)) {
300 Val = DAG.getNode(ISD::BITCAST, DL, MVT::i64, Val);
301 return DAG.getNode(ISD::TRUNCATE, DL, ValueVT, Val);
302 }
303
304 report_fatal_error("Unknown mismatch in getCopyFromParts!");
305}
306
307static void diagnosePossiblyInvalidConstraint(LLVMContext &Ctx, const Value *V,
308 const Twine &ErrMsg) {
309 const Instruction *I = dyn_cast_or_null<Instruction>(V);
310 if (!V)
311 return Ctx.emitError(ErrMsg);
312
313 const char *AsmError = ", possible invalid constraint for vector type";
314 if (const CallInst *CI = dyn_cast<CallInst>(I))
315 if (CI->isInlineAsm())
316 return Ctx.emitError(I, ErrMsg + AsmError);
317
318 return Ctx.emitError(I, ErrMsg);
319}
320
321/// getCopyFromPartsVector - Create a value that contains the specified legal
322/// parts combined into the value they represent. If the parts combine to a
323/// type larger than ValueVT then AssertOp can be used to specify whether the
324/// extra bits are known to be zero (ISD::AssertZext) or sign extended from
325/// ValueVT (ISD::AssertSext).
326static SDValue getCopyFromPartsVector(SelectionDAG &DAG, const SDLoc &DL,
327 const SDValue *Parts, unsigned NumParts,
328 MVT PartVT, EVT ValueVT, const Value *V,
329 Optional<CallingConv::ID> CallConv) {
330 assert(ValueVT.isVector() && "Not a vector value")((void)0);
331 assert(NumParts > 0 && "No parts to assemble!")((void)0);
332 const bool IsABIRegCopy = CallConv.hasValue();
333
334 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
335 SDValue Val = Parts[0];
336
337 // Handle a multi-element vector.
338 if (NumParts > 1) {
339 EVT IntermediateVT;
340 MVT RegisterVT;
341 unsigned NumIntermediates;
342 unsigned NumRegs;
343
344 if (IsABIRegCopy) {
345 NumRegs = TLI.getVectorTypeBreakdownForCallingConv(
346 *DAG.getContext(), CallConv.getValue(), ValueVT, IntermediateVT,
347 NumIntermediates, RegisterVT);
348 } else {
349 NumRegs =
350 TLI.getVectorTypeBreakdown(*DAG.getContext(), ValueVT, IntermediateVT,
351 NumIntermediates, RegisterVT);
352 }
353
354 assert(NumRegs == NumParts && "Part count doesn't match vector breakdown!")((void)0);
355 NumParts = NumRegs; // Silence a compiler warning.
356 assert(RegisterVT == PartVT && "Part type doesn't match vector breakdown!")((void)0);
357 assert(RegisterVT.getSizeInBits() ==((void)0)
358 Parts[0].getSimpleValueType().getSizeInBits() &&((void)0)
359 "Part type sizes don't match!")((void)0);
360
361 // Assemble the parts into intermediate operands.
362 SmallVector<SDValue, 8> Ops(NumIntermediates);
363 if (NumIntermediates == NumParts) {
364 // If the register was not expanded, truncate or copy the value,
365 // as appropriate.
366 for (unsigned i = 0; i != NumParts; ++i)
367 Ops[i] = getCopyFromParts(DAG, DL, &Parts[i], 1,
368 PartVT, IntermediateVT, V, CallConv);
369 } else if (NumParts > 0) {
370 // If the intermediate type was expanded, build the intermediate
371 // operands from the parts.
372 assert(NumParts % NumIntermediates == 0 &&((void)0)
373 "Must expand into a divisible number of parts!")((void)0);
374 unsigned Factor = NumParts / NumIntermediates;
375 for (unsigned i = 0; i != NumIntermediates; ++i)
376 Ops[i] = getCopyFromParts(DAG, DL, &Parts[i * Factor], Factor,
377 PartVT, IntermediateVT, V, CallConv);
378 }
379
380 // Build a vector with BUILD_VECTOR or CONCAT_VECTORS from the
381 // intermediate operands.
382 EVT BuiltVectorTy =
383 IntermediateVT.isVector()
384 ? EVT::getVectorVT(
385 *DAG.getContext(), IntermediateVT.getScalarType(),
386 IntermediateVT.getVectorElementCount() * NumParts)
387 : EVT::getVectorVT(*DAG.getContext(),
388 IntermediateVT.getScalarType(),
389 NumIntermediates);
390 Val = DAG.getNode(IntermediateVT.isVector() ? ISD::CONCAT_VECTORS
391 : ISD::BUILD_VECTOR,
392 DL, BuiltVectorTy, Ops);
393 }
394
395 // There is now one part, held in Val. Correct it to match ValueVT.
396 EVT PartEVT = Val.getValueType();
397
398 if (PartEVT == ValueVT)
399 return Val;
400
401 if (PartEVT.isVector()) {
402 // If the element type of the source/dest vectors are the same, but the
403 // parts vector has more elements than the value vector, then we have a
404 // vector widening case (e.g. <2 x float> -> <4 x float>). Extract the
405 // elements we want.
406 if (PartEVT.getVectorElementType() == ValueVT.getVectorElementType()) {
407 assert((PartEVT.getVectorElementCount().getKnownMinValue() >((void)0)
408 ValueVT.getVectorElementCount().getKnownMinValue()) &&((void)0)
409 (PartEVT.getVectorElementCount().isScalable() ==((void)0)
410 ValueVT.getVectorElementCount().isScalable()) &&((void)0)
411 "Cannot narrow, it would be a lossy transformation")((void)0);
412 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, ValueVT, Val,
413 DAG.getVectorIdxConstant(0, DL));
414 }
415
416 // Vector/Vector bitcast.
417 if (ValueVT.getSizeInBits() == PartEVT.getSizeInBits())
418 return DAG.getNode(ISD::BITCAST, DL, ValueVT, Val);
419
420 assert(PartEVT.getVectorElementCount() == ValueVT.getVectorElementCount() &&((void)0)
421 "Cannot handle this kind of promotion")((void)0);
422 // Promoted vector extract
423 return DAG.getAnyExtOrTrunc(Val, DL, ValueVT);
424
425 }
426
427 // Trivial bitcast if the types are the same size and the destination
428 // vector type is legal.
429 if (PartEVT.getSizeInBits() == ValueVT.getSizeInBits() &&
430 TLI.isTypeLegal(ValueVT))
431 return DAG.getNode(ISD::BITCAST, DL, ValueVT, Val);
432
433 if (ValueVT.getVectorNumElements() != 1) {
434 // Certain ABIs require that vectors are passed as integers. For vectors
435 // are the same size, this is an obvious bitcast.
436 if (ValueVT.getSizeInBits() == PartEVT.getSizeInBits()) {
437 return DAG.getNode(ISD::BITCAST, DL, ValueVT, Val);
438 } else if (ValueVT.bitsLT(PartEVT)) {
439 const uint64_t ValueSize = ValueVT.getFixedSizeInBits();
440 EVT IntermediateType = EVT::getIntegerVT(*DAG.getContext(), ValueSize);
441 // Drop the extra bits.
442 Val = DAG.getNode(ISD::TRUNCATE, DL, IntermediateType, Val);
443 return DAG.getBitcast(ValueVT, Val);
444 }
445
446 diagnosePossiblyInvalidConstraint(
447 *DAG.getContext(), V, "non-trivial scalar-to-vector conversion");
448 return DAG.getUNDEF(ValueVT);
449 }
450
451 // Handle cases such as i8 -> <1 x i1>
452 EVT ValueSVT = ValueVT.getVectorElementType();
453 if (ValueVT.getVectorNumElements() == 1 && ValueSVT != PartEVT) {
454 if (ValueSVT.getSizeInBits() == PartEVT.getSizeInBits())
455 Val = DAG.getNode(ISD::BITCAST, DL, ValueSVT, Val);
456 else
457 Val = ValueVT.isFloatingPoint()
458 ? DAG.getFPExtendOrRound(Val, DL, ValueSVT)
459 : DAG.getAnyExtOrTrunc(Val, DL, ValueSVT);
460 }
461
462 return DAG.getBuildVector(ValueVT, DL, Val);
463}
464
465static void getCopyToPartsVector(SelectionDAG &DAG, const SDLoc &dl,
466 SDValue Val, SDValue *Parts, unsigned NumParts,
467 MVT PartVT, const Value *V,
468 Optional<CallingConv::ID> CallConv);
469
470/// getCopyToParts - Create a series of nodes that contain the specified value
471/// split into legal parts. If the parts contain more bits than Val, then, for
472/// integers, ExtendKind can be used to specify how to generate the extra bits.
473static void getCopyToParts(SelectionDAG &DAG, const SDLoc &DL, SDValue Val,
474 SDValue *Parts, unsigned NumParts, MVT PartVT,
475 const Value *V,
476 Optional<CallingConv::ID> CallConv = None,
477 ISD::NodeType ExtendKind = ISD::ANY_EXTEND) {
478 // Let the target split the parts if it wants to
479 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
480 if (TLI.splitValueIntoRegisterParts(DAG, DL, Val, Parts, NumParts, PartVT,
24
←
Assuming the condition is false
→
25
←
Taking false branch
→
481 CallConv))
482 return;
483 EVT ValueVT = Val.getValueType();
484
485 // Handle the vector case separately.
486 if (ValueVT.isVector())
26
←
Assuming the condition is true
→
27
←
Taking true branch
→
487 return getCopyToPartsVector(DAG, DL, Val, Parts, NumParts, PartVT, V,
28
←
Calling 'getCopyToPartsVector'
→
488 CallConv);
489
490 unsigned PartBits = PartVT.getSizeInBits();
491 unsigned OrigNumParts = NumParts;
492 assert(DAG.getTargetLoweringInfo().isTypeLegal(PartVT) &&((void)0)
493 "Copying to an illegal type!")((void)0);
494
495 if (NumParts == 0)
496 return;
497
498 assert(!ValueVT.isVector() && "Vector case handled elsewhere")((void)0);
499 EVT PartEVT = PartVT;
500 if (PartEVT == ValueVT) {
501 assert(NumParts == 1 && "No-op copy with multiple parts!")((void)0);
502 Parts[0] = Val;
503 return;
504 }
505
506 if (NumParts * PartBits > ValueVT.getSizeInBits()) {
507 // If the parts cover more bits than the value has, promote the value.
508 if (PartVT.isFloatingPoint() && ValueVT.isFloatingPoint()) {
509 assert(NumParts == 1 && "Do not know what to promote to!")((void)0);
510 Val = DAG.getNode(ISD::FP_EXTEND, DL, PartVT, Val);
511 } else {
512 if (ValueVT.isFloatingPoint()) {
513 // FP values need to be bitcast, then extended if they are being put
514 // into a larger container.
515 ValueVT = EVT::getIntegerVT(*DAG.getContext(), ValueVT.getSizeInBits());
516 Val = DAG.getNode(ISD::BITCAST, DL, ValueVT, Val);
517 }
518 assert((PartVT.isInteger() || PartVT == MVT::x86mmx) &&((void)0)
519 ValueVT.isInteger() &&((void)0)
520 "Unknown mismatch!")((void)0);
521 ValueVT = EVT::getIntegerVT(*DAG.getContext(), NumParts * PartBits);
522 Val = DAG.getNode(ExtendKind, DL, ValueVT, Val);
523 if (PartVT == MVT::x86mmx)
524 Val = DAG.getNode(ISD::BITCAST, DL, PartVT, Val);
525 }
526 } else if (PartBits == ValueVT.getSizeInBits()) {
527 // Different types of the same size.
528 assert(NumParts == 1 && PartEVT != ValueVT)((void)0);
529 Val = DAG.getNode(ISD::BITCAST, DL, PartVT, Val);
530 } else if (NumParts * PartBits < ValueVT.getSizeInBits()) {
531 // If the parts cover less bits than value has, truncate the value.
532 assert((PartVT.isInteger() || PartVT == MVT::x86mmx) &&((void)0)
533 ValueVT.isInteger() &&((void)0)
534 "Unknown mismatch!")((void)0);
535 ValueVT = EVT::getIntegerVT(*DAG.getContext(), NumParts * PartBits);
536 Val = DAG.getNode(ISD::TRUNCATE, DL, ValueVT, Val);
537 if (PartVT == MVT::x86mmx)
538 Val = DAG.getNode(ISD::BITCAST, DL, PartVT, Val);
539 }
540
541 // The value may have changed - recompute ValueVT.
542 ValueVT = Val.getValueType();
543 assert(NumParts * PartBits == ValueVT.getSizeInBits() &&((void)0)
544 "Failed to tile the value with PartVT!")((void)0);
545
546 if (NumParts == 1) {
547 if (PartEVT != ValueVT) {
548 diagnosePossiblyInvalidConstraint(*DAG.getContext(), V,
549 "scalar-to-vector conversion failed");
550 Val = DAG.getNode(ISD::BITCAST, DL, PartVT, Val);
551 }
552
553 Parts[0] = Val;
554 return;
555 }
556
557 // Expand the value into multiple parts.
558 if (NumParts & (NumParts - 1)) {
559 // The number of parts is not a power of 2. Split off and copy the tail.
560 assert(PartVT.isInteger() && ValueVT.isInteger() &&((void)0)
561 "Do not know what to expand to!")((void)0);
562 unsigned RoundParts = 1 << Log2_32(NumParts);
563 unsigned RoundBits = RoundParts * PartBits;
564 unsigned OddParts = NumParts - RoundParts;
565 SDValue OddVal = DAG.getNode(ISD::SRL, DL, ValueVT, Val,
566 DAG.getShiftAmountConstant(RoundBits, ValueVT, DL, /*LegalTypes*/false));
567
568 getCopyToParts(DAG, DL, OddVal, Parts + RoundParts, OddParts, PartVT, V,
569 CallConv);
570
571 if (DAG.getDataLayout().isBigEndian())
572 // The odd parts were reversed by getCopyToParts - unreverse them.
573 std::reverse(Parts + RoundParts, Parts + NumParts);
574
575 NumParts = RoundParts;
576 ValueVT = EVT::getIntegerVT(*DAG.getContext(), NumParts * PartBits);
577 Val = DAG.getNode(ISD::TRUNCATE, DL, ValueVT, Val);
578 }
579
580 // The number of parts is a power of 2. Repeatedly bisect the value using
581 // EXTRACT_ELEMENT.
582 Parts[0] = DAG.getNode(ISD::BITCAST, DL,
583 EVT::getIntegerVT(*DAG.getContext(),
584 ValueVT.getSizeInBits()),
585 Val);
586
587 for (unsigned StepSize = NumParts; StepSize > 1; StepSize /= 2) {
588 for (unsigned i = 0; i < NumParts; i += StepSize) {
589 unsigned ThisBits = StepSize * PartBits / 2;
590 EVT ThisVT = EVT::getIntegerVT(*DAG.getContext(), ThisBits);
591 SDValue &Part0 = Parts[i];
592 SDValue &Part1 = Parts[i+StepSize/2];
593
594 Part1 = DAG.getNode(ISD::EXTRACT_ELEMENT, DL,
595 ThisVT, Part0, DAG.getIntPtrConstant(1, DL));
596 Part0 = DAG.getNode(ISD::EXTRACT_ELEMENT, DL,
597 ThisVT, Part0, DAG.getIntPtrConstant(0, DL));
598
599 if (ThisBits == PartBits && ThisVT != PartVT) {
600 Part0 = DAG.getNode(ISD::BITCAST, DL, PartVT, Part0);
601 Part1 = DAG.getNode(ISD::BITCAST, DL, PartVT, Part1);
602 }
603 }
604 }
605
606 if (DAG.getDataLayout().isBigEndian())
607 std::reverse(Parts, Parts + OrigNumParts);
608}
609
610static SDValue widenVectorToPartType(SelectionDAG &DAG, SDValue Val,
611 const SDLoc &DL, EVT PartVT) {
612 if (!PartVT.isVector())
613 return SDValue();
614
615 EVT ValueVT = Val.getValueType();
616 ElementCount PartNumElts = PartVT.getVectorElementCount();
617 ElementCount ValueNumElts = ValueVT.getVectorElementCount();
618
619 // We only support widening vectors with equivalent element types and
620 // fixed/scalable properties. If a target needs to widen a fixed-length type
621 // to a scalable one, it should be possible to use INSERT_SUBVECTOR below.
622 if (ElementCount::isKnownLE(PartNumElts, ValueNumElts) ||
623 PartNumElts.isScalable() != ValueNumElts.isScalable() ||
624 PartVT.getVectorElementType() != ValueVT.getVectorElementType())
625 return SDValue();
626
627 // Widening a scalable vector to another scalable vector is done by inserting
628 // the vector into a larger undef one.
629 if (PartNumElts.isScalable())
630 return DAG.getNode(ISD::INSERT_SUBVECTOR, DL, PartVT, DAG.getUNDEF(PartVT),
631 Val, DAG.getVectorIdxConstant(0, DL));
632
633 EVT ElementVT = PartVT.getVectorElementType();
634 // Vector widening case, e.g. <2 x float> -> <4 x float>. Shuffle in
635 // undef elements.
636 SmallVector<SDValue, 16> Ops;
637 DAG.ExtractVectorElements(Val, Ops);
638 SDValue EltUndef = DAG.getUNDEF(ElementVT);
639 Ops.append((PartNumElts - ValueNumElts).getFixedValue(), EltUndef);
640
641 // FIXME: Use CONCAT for 2x -> 4x.
642 return DAG.getBuildVector(PartVT, DL, Ops);
643}
644
645/// getCopyToPartsVector - Create a series of nodes that contain the specified
646/// value split into legal parts.
647static void getCopyToPartsVector(SelectionDAG &DAG, const SDLoc &DL,
648 SDValue Val, SDValue *Parts, unsigned NumParts,
649 MVT PartVT, const Value *V,
650 Optional<CallingConv::ID> CallConv) {
651 EVT ValueVT = Val.getValueType();
652 assert(ValueVT.isVector() && "Not a vector")((void)0);
653 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
654 const bool IsABIRegCopy = CallConv.hasValue();
655
656 if (NumParts == 1) {
29
←
Assuming 'NumParts' is not equal to 1
→
30
←
Taking false branch
→
657 EVT PartEVT = PartVT;
658 if (PartEVT == ValueVT) {
659 // Nothing to do.
660 } else if (PartVT.getSizeInBits() == ValueVT.getSizeInBits()) {
661 // Bitconvert vector->vector case.
662 Val = DAG.getNode(ISD::BITCAST, DL, PartVT, Val);
663 } else if (SDValue Widened = widenVectorToPartType(DAG, Val, DL, PartVT)) {
664 Val = Widened;
665 } else if (PartVT.isVector() &&
666 PartEVT.getVectorElementType().bitsGE(
667 ValueVT.getVectorElementType()) &&
668 PartEVT.getVectorElementCount() ==
669 ValueVT.getVectorElementCount()) {
670
671 // Promoted vector extract
672 Val = DAG.getAnyExtOrTrunc(Val, DL, PartVT);
673 } else {
674 if (ValueVT.getVectorElementCount().isScalar()) {
675 Val = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, PartVT, Val,
676 DAG.getVectorIdxConstant(0, DL));
677 } else {
678 uint64_t ValueSize = ValueVT.getFixedSizeInBits();
679 assert(PartVT.getFixedSizeInBits() > ValueSize &&((void)0)
680 "lossy conversion of vector to scalar type")((void)0);
681 EVT IntermediateType = EVT::getIntegerVT(*DAG.getContext(), ValueSize);
682 Val = DAG.getBitcast(IntermediateType, Val);
683 Val = DAG.getAnyExtOrTrunc(Val, DL, PartVT);
684 }
685 }
686
687 assert(Val.getValueType() == PartVT && "Unexpected vector part value type")((void)0);
688 Parts[0] = Val;
689 return;
690 }
691
692 // Handle a multi-element vector.
693 EVT IntermediateVT;
694 MVT RegisterVT;
695 unsigned NumIntermediates;
696 unsigned NumRegs;
697 if (IsABIRegCopy
30.1
'IsABIRegCopy' is false
) {
31
←
Taking false branch
→
698 NumRegs = TLI.getVectorTypeBreakdownForCallingConv(
699 *DAG.getContext(), CallConv.getValue(), ValueVT, IntermediateVT,
700 NumIntermediates, RegisterVT);
701 } else {
702 NumRegs =
703 TLI.getVectorTypeBreakdown(*DAG.getContext(), ValueVT, IntermediateVT,
32
←
Value assigned to 'NumIntermediates'
→
704 NumIntermediates, RegisterVT);
705 }
706
707 assert(NumRegs == NumParts && "Part count doesn't match vector breakdown!")((void)0);
708 NumParts = NumRegs; // Silence a compiler warning.
709 assert(RegisterVT == PartVT && "Part type doesn't match vector breakdown!")((void)0);
710
711 assert(IntermediateVT.isScalableVector() == ValueVT.isScalableVector() &&((void)0)
712 "Mixing scalable and fixed vectors when copying in parts")((void)0);
713
714 Optional<ElementCount> DestEltCnt;
715
716 if (IntermediateVT.isVector())
33
←
Assuming the condition is true
→
34
←
Taking true branch
→
717 DestEltCnt = IntermediateVT.getVectorElementCount() * NumIntermediates;
718 else
719 DestEltCnt = ElementCount::getFixed(NumIntermediates);
720
721 EVT BuiltVectorTy = EVT::getVectorVT(
722 *DAG.getContext(), IntermediateVT.getScalarType(), DestEltCnt.getValue());
723
724 if (ValueVT == BuiltVectorTy) {
35
←
Taking true branch
→
725 // Nothing to do.
726 } else if (ValueVT.getSizeInBits() == BuiltVectorTy.getSizeInBits()) {
727 // Bitconvert vector->vector case.
728 Val = DAG.getNode(ISD::BITCAST, DL, BuiltVectorTy, Val);
729 } else if (SDValue Widened =
730 widenVectorToPartType(DAG, Val, DL, BuiltVectorTy)) {
731 Val = Widened;
732 } else if (BuiltVectorTy.getVectorElementType().bitsGE(
733 ValueVT.getVectorElementType()) &&
734 BuiltVectorTy.getVectorElementCount() ==
735 ValueVT.getVectorElementCount()) {
736 // Promoted vector extract
737 Val = DAG.getAnyExtOrTrunc(Val, DL, BuiltVectorTy);
738 }
739
740 assert(Val.getValueType() == BuiltVectorTy && "Unexpected vector value type")((void)0);
741
742 // Split the vector into intermediate operands.
743 SmallVector<SDValue, 8> Ops(NumIntermediates);
744 for (unsigned i = 0; i != NumIntermediates; ++i) {
36
←
Assuming 'i' is equal to 'NumIntermediates'
→
37
←
Loop condition is false. Execution continues on line 759
→
745 if (IntermediateVT.isVector()) {
746 // This does something sensible for scalable vectors - see the
747 // definition of EXTRACT_SUBVECTOR for further details.
748 unsigned IntermediateNumElts = IntermediateVT.getVectorMinNumElements();
749 Ops[i] =
750 DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, IntermediateVT, Val,
751 DAG.getVectorIdxConstant(i * IntermediateNumElts, DL));
752 } else {
753 Ops[i] = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, IntermediateVT, Val,
754 DAG.getVectorIdxConstant(i, DL));
755 }
756 }
757
758 // Split the intermediate operands into legal parts.
759 if (NumParts == NumIntermediates) {
38
←
Assuming 'NumParts' is not equal to 'NumIntermediates'
→
39
←
Taking false branch
→
760 // If the register was not expanded, promote or copy the value,
761 // as appropriate.
762 for (unsigned i = 0; i != NumParts; ++i)
763 getCopyToParts(DAG, DL, Ops[i], &Parts[i], 1, PartVT, V, CallConv);
764 } else if (NumParts
39.1
'NumParts' is > 0
 > 0) {
40
←
Taking true branch
→
765 // If the intermediate type was expanded, split each the value into
766 // legal parts.
767 assert(NumIntermediates != 0 && "division by zero")((void)0);
768 assert(NumParts % NumIntermediates == 0 &&((void)0)
769 "Must expand into a divisible number of parts!")((void)0);
770 unsigned Factor = NumParts / NumIntermediates;
41
←
Division by zero
771 for (unsigned i = 0; i != NumIntermediates; ++i)
772 getCopyToParts(DAG, DL, Ops[i], &Parts[i * Factor], Factor, PartVT, V,
773 CallConv);
774 }
775}
776
777RegsForValue::RegsForValue(const SmallVector<unsigned, 4> &regs, MVT regvt,
778 EVT valuevt, Optional<CallingConv::ID> CC)
779 : ValueVTs(1, valuevt), RegVTs(1, regvt), Regs(regs),
780 RegCount(1, regs.size()), CallConv(CC) {}
781
782RegsForValue::RegsForValue(LLVMContext &Context, const TargetLowering &TLI,
783 const DataLayout &DL, unsigned Reg, Type *Ty,
784 Optional<CallingConv::ID> CC) {
785 ComputeValueVTs(TLI, DL, Ty, ValueVTs);
786
787 CallConv = CC;
788
789 for (EVT ValueVT : ValueVTs) {
790 unsigned NumRegs =
791 isABIMangled()
792 ? TLI.getNumRegistersForCallingConv(Context, CC.getValue(), ValueVT)
793 : TLI.getNumRegisters(Context, ValueVT);
794 MVT RegisterVT =
795 isABIMangled()
796 ? TLI.getRegisterTypeForCallingConv(Context, CC.getValue(), ValueVT)
797 : TLI.getRegisterType(Context, ValueVT);
798 for (unsigned i = 0; i != NumRegs; ++i)
799 Regs.push_back(Reg + i);
800 RegVTs.push_back(RegisterVT);
801 RegCount.push_back(NumRegs);
802 Reg += NumRegs;
803 }
804}
805
806SDValue RegsForValue::getCopyFromRegs(SelectionDAG &DAG,
807 FunctionLoweringInfo &FuncInfo,
808 const SDLoc &dl, SDValue &Chain,
809 SDValue *Flag, const Value *V) const {
810 // A Value with type {} or [0 x %t] needs no registers.
811 if (ValueVTs.empty())
812 return SDValue();
813
814 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
815
816 // Assemble the legal parts into the final values.
817 SmallVector<SDValue, 4> Values(ValueVTs.size());
818 SmallVector<SDValue, 8> Parts;
819 for (unsigned Value = 0, Part = 0, e = ValueVTs.size(); Value != e; ++Value) {
820 // Copy the legal parts from the registers.
821 EVT ValueVT = ValueVTs[Value];
822 unsigned NumRegs = RegCount[Value];
823 MVT RegisterVT = isABIMangled() ? TLI.getRegisterTypeForCallingConv(
824 *DAG.getContext(),
825 CallConv.getValue(), RegVTs[Value])
826 : RegVTs[Value];
827
828 Parts.resize(NumRegs);
829 for (unsigned i = 0; i != NumRegs; ++i) {
830 SDValue P;
831 if (!Flag) {
832 P = DAG.getCopyFromReg(Chain, dl, Regs[Part+i], RegisterVT);
833 } else {
834 P = DAG.getCopyFromReg(Chain, dl, Regs[Part+i], RegisterVT, *Flag);
835 *Flag = P.getValue(2);
836 }
837
838 Chain = P.getValue(1);
839 Parts[i] = P;
840
841 // If the source register was virtual and if we know something about it,
842 // add an assert node.
843 if (!Register::isVirtualRegister(Regs[Part + i]) ||
844 !RegisterVT.isInteger())
845 continue;
846
847 const FunctionLoweringInfo::LiveOutInfo *LOI =
848 FuncInfo.GetLiveOutRegInfo(Regs[Part+i]);
849 if (!LOI)
850 continue;
851
852 unsigned RegSize = RegisterVT.getScalarSizeInBits();
853 unsigned NumSignBits = LOI->NumSignBits;
854 unsigned NumZeroBits = LOI->Known.countMinLeadingZeros();
855
856 if (NumZeroBits == RegSize) {
857 // The current value is a zero.
858 // Explicitly express that as it would be easier for
859 // optimizations to kick in.
860 Parts[i] = DAG.getConstant(0, dl, RegisterVT);
861 continue;
862 }
863
864 // FIXME: We capture more information than the dag can represent. For
865 // now, just use the tightest assertzext/assertsext possible.
866 bool isSExt;
867 EVT FromVT(MVT::Other);
868 if (NumZeroBits) {
869 FromVT = EVT::getIntegerVT(*DAG.getContext(), RegSize - NumZeroBits);
870 isSExt = false;
871 } else if (NumSignBits > 1) {
872 FromVT =
873 EVT::getIntegerVT(*DAG.getContext(), RegSize - NumSignBits + 1);
874 isSExt = true;
875 } else {
876 continue;
877 }
878 // Add an assertion node.
879 assert(FromVT != MVT::Other)((void)0);
880 Parts[i] = DAG.getNode(isSExt ? ISD::AssertSext : ISD::AssertZext, dl,
881 RegisterVT, P, DAG.getValueType(FromVT));
882 }
883
884 Values[Value] = getCopyFromParts(DAG, dl, Parts.begin(), NumRegs,
885 RegisterVT, ValueVT, V, CallConv);
886 Part += NumRegs;
887 Parts.clear();
888 }
889
890 return DAG.getNode(ISD::MERGE_VALUES, dl, DAG.getVTList(ValueVTs), Values);
891}
892
893void RegsForValue::getCopyToRegs(SDValue Val, SelectionDAG &DAG,
894 const SDLoc &dl, SDValue &Chain, SDValue *Flag,
895 const Value *V,
896 ISD::NodeType PreferredExtendType) const {
897 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
898 ISD::NodeType ExtendKind = PreferredExtendType;
899
900 // Get the list of the values's legal parts.
901 unsigned NumRegs = Regs.size();
902 SmallVector<SDValue, 8> Parts(NumRegs);
903 for (unsigned Value = 0, Part = 0, e = ValueVTs.size(); Value != e; ++Value) {
17
←
Assuming 'Value' is not equal to 'e'
→
18
←
Loop condition is true. Entering loop body
→
904 unsigned NumParts = RegCount[Value];
905
906 MVT RegisterVT = isABIMangled() ? TLI.getRegisterTypeForCallingConv(
19
←
Assuming the condition is false
→
20
←
'?' condition is false
→
907 *DAG.getContext(),
908 CallConv.getValue(), RegVTs[Value])
909 : RegVTs[Value];
910
911 if (ExtendKind == ISD::ANY_EXTEND && TLI.isZExtFree(Val, RegisterVT))
21
←
Assuming 'ExtendKind' is not equal to ANY_EXTEND
→
22
←
Taking false branch
→
912 ExtendKind = ISD::ZERO_EXTEND;
913
914 getCopyToParts(DAG, dl, Val.getValue(Val.getResNo() + Value), &Parts[Part],
23
←
Calling 'getCopyToParts'
→
915 NumParts, RegisterVT, V, CallConv, ExtendKind);
916 Part += NumParts;
917 }
918
919 // Copy the parts into the registers.
920 SmallVector<SDValue, 8> Chains(NumRegs);
921 for (unsigned i = 0; i != NumRegs; ++i) {
922 SDValue Part;
923 if (!Flag) {
924 Part = DAG.getCopyToReg(Chain, dl, Regs[i], Parts[i]);
925 } else {
926 Part = DAG.getCopyToReg(Chain, dl, Regs[i], Parts[i], *Flag);
927 *Flag = Part.getValue(1);
928 }
929
930 Chains[i] = Part.getValue(0);
931 }
932
933 if (NumRegs == 1 || Flag)
934 // If NumRegs > 1 && Flag is used then the use of the last CopyToReg is
935 // flagged to it. That is the CopyToReg nodes and the user are considered
936 // a single scheduling unit. If we create a TokenFactor and return it as
937 // chain, then the TokenFactor is both a predecessor (operand) of the
938 // user as well as a successor (the TF operands are flagged to the user).
939 // c1, f1 = CopyToReg
940 // c2, f2 = CopyToReg
941 // c3 = TokenFactor c1, c2
942 // ...
943 // = op c3, ..., f2
944 Chain = Chains[NumRegs-1];
945 else
946 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Chains);
947}
948
949void RegsForValue::AddInlineAsmOperands(unsigned Code, bool HasMatching,
950 unsigned MatchingIdx, const SDLoc &dl,
951 SelectionDAG &DAG,
952 std::vector<SDValue> &Ops) const {
953 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
954
955 unsigned Flag = InlineAsm::getFlagWord(Code, Regs.size());
956 if (HasMatching)
957 Flag = InlineAsm::getFlagWordForMatchingOp(Flag, MatchingIdx);
958 else if (!Regs.empty() && Register::isVirtualRegister(Regs.front())) {
959 // Put the register class of the virtual registers in the flag word. That
960 // way, later passes can recompute register class constraints for inline
961 // assembly as well as normal instructions.
962 // Don't do this for tied operands that can use the regclass information
963 // from the def.
964 const MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo();
965 const TargetRegisterClass *RC = MRI.getRegClass(Regs.front());
966 Flag = InlineAsm::getFlagWordForRegClass(Flag, RC->getID());
967 }
968
969 SDValue Res = DAG.getTargetConstant(Flag, dl, MVT::i32);
970 Ops.push_back(Res);
971
972 if (Code == InlineAsm::Kind_Clobber) {
973 // Clobbers should always have a 1:1 mapping with registers, and may
974 // reference registers that have illegal (e.g. vector) types. Hence, we
975 // shouldn't try to apply any sort of splitting logic to them.
976 assert(Regs.size() == RegVTs.size() && Regs.size() == ValueVTs.size() &&((void)0)
977 "No 1:1 mapping from clobbers to regs?")((void)0);
978 Register SP = TLI.getStackPointerRegisterToSaveRestore();
979 (void)SP;
980 for (unsigned I = 0, E = ValueVTs.size(); I != E; ++I) {
981 Ops.push_back(DAG.getRegister(Regs[I], RegVTs[I]));
982 assert(((void)0)
983 (Regs[I] != SP ||((void)0)
984 DAG.getMachineFunction().getFrameInfo().hasOpaqueSPAdjustment()) &&((void)0)
985 "If we clobbered the stack pointer, MFI should know about it.")((void)0);
986 }
987 return;
988 }
989
990 for (unsigned Value = 0, Reg = 0, e = ValueVTs.size(); Value != e; ++Value) {
991 MVT RegisterVT = RegVTs[Value];
992 unsigned NumRegs = TLI.getNumRegisters(*DAG.getContext(), ValueVTs[Value],
993 RegisterVT);
994 for (unsigned i = 0; i != NumRegs; ++i) {
995 assert(Reg < Regs.size() && "Mismatch in # registers expected")((void)0);
996 unsigned TheReg = Regs[Reg++];
997 Ops.push_back(DAG.getRegister(TheReg, RegisterVT));
998 }
999 }
1000}
1001
1002SmallVector<std::pair<unsigned, TypeSize>, 4>
1003RegsForValue::getRegsAndSizes() const {
1004 SmallVector<std::pair<unsigned, TypeSize>, 4> OutVec;
1005 unsigned I = 0;
1006 for (auto CountAndVT : zip_first(RegCount, RegVTs)) {
1007 unsigned RegCount = std::get<0>(CountAndVT);
1008 MVT RegisterVT = std::get<1>(CountAndVT);
1009 TypeSize RegisterSize = RegisterVT.getSizeInBits();
1010 for (unsigned E = I + RegCount; I != E; ++I)
1011 OutVec.push_back(std::make_pair(Regs[I], RegisterSize));
1012 }
1013 return OutVec;
1014}
1015
1016void SelectionDAGBuilder::init(GCFunctionInfo *gfi, AliasAnalysis *aa,
1017 const TargetLibraryInfo *li) {
1018 AA = aa;
1019 GFI = gfi;
1020 LibInfo = li;
1021 DL = &DAG.getDataLayout();
1022 Context = DAG.getContext();
1023 LPadToCallSiteMap.clear();
1024 SL->init(DAG.getTargetLoweringInfo(), TM, DAG.getDataLayout());
1025}
1026
1027void SelectionDAGBuilder::clear() {
1028 NodeMap.clear();
1029 UnusedArgNodeMap.clear();
1030 PendingLoads.clear();
1031 PendingExports.clear();
1032 PendingConstrainedFP.clear();
1033 PendingConstrainedFPStrict.clear();
1034 CurInst = nullptr;
1035 HasTailCall = false;
1036 SDNodeOrder = LowestSDNodeOrder;
1037 StatepointLowering.clear();
1038}
1039
1040void SelectionDAGBuilder::clearDanglingDebugInfo() {
1041 DanglingDebugInfoMap.clear();
1042}
1043
1044// Update DAG root to include dependencies on Pending chains.
1045SDValue SelectionDAGBuilder::updateRoot(SmallVectorImpl<SDValue> &Pending) {
1046 SDValue Root = DAG.getRoot();
1047
1048 if (Pending.empty())
1049 return Root;
1050
1051 // Add current root to PendingChains, unless we already indirectly
1052 // depend on it.
1053 if (Root.getOpcode() != ISD::EntryToken) {
1054 unsigned i = 0, e = Pending.size();
1055 for (; i != e; ++i) {
1056 assert(Pending[i].getNode()->getNumOperands() > 1)((void)0);
1057 if (Pending[i].getNode()->getOperand(0) == Root)
1058 break; // Don't add the root if we already indirectly depend on it.
1059 }
1060
1061 if (i == e)
1062 Pending.push_back(Root);
1063 }
1064
1065 if (Pending.size() == 1)
1066 Root = Pending[0];
1067 else
1068 Root = DAG.getTokenFactor(getCurSDLoc(), Pending);
1069
1070 DAG.setRoot(Root);
1071 Pending.clear();
1072 return Root;
1073}
1074
1075SDValue SelectionDAGBuilder::getMemoryRoot() {
1076 return updateRoot(PendingLoads);
1077}
1078
1079SDValue SelectionDAGBuilder::getRoot() {
1080 // Chain up all pending constrained intrinsics together with all
1081 // pending loads, by simply appending them to PendingLoads and
1082 // then calling getMemoryRoot().
1083 PendingLoads.reserve(PendingLoads.size() +
1084 PendingConstrainedFP.size() +
1085 PendingConstrainedFPStrict.size());
1086 PendingLoads.append(PendingConstrainedFP.begin(),
1087 PendingConstrainedFP.end());
1088 PendingLoads.append(PendingConstrainedFPStrict.begin(),
1089 PendingConstrainedFPStrict.end());
1090 PendingConstrainedFP.clear();
1091 PendingConstrainedFPStrict.clear();
1092 return getMemoryRoot();
1093}
1094
1095SDValue SelectionDAGBuilder::getControlRoot() {
1096 // We need to emit pending fpexcept.strict constrained intrinsics,
1097 // so append them to the PendingExports list.
1098 PendingExports.append(PendingConstrainedFPStrict.begin(),
1099 PendingConstrainedFPStrict.end());
1100 PendingConstrainedFPStrict.clear();
1101 return updateRoot(PendingExports);
1102}
1103
1104void SelectionDAGBuilder::visit(const Instruction &I) {
1105 // Set up outgoing PHI node register values before emitting the terminator.
1106 if (I.isTerminator()) {
1107 HandlePHINodesInSuccessorBlocks(I.getParent());
1108 }
1109
1110 // Increase the SDNodeOrder if dealing with a non-debug instruction.
1111 if (!isa<DbgInfoIntrinsic>(I))
1112 ++SDNodeOrder;
1113
1114 CurInst = &I;
1115
1116 visit(I.getOpcode(), I);
1117
1118 if (!I.isTerminator() && !HasTailCall &&
1119 !isa<GCStatepointInst>(I)) // statepoints handle their exports internally
1120 CopyToExportRegsIfNeeded(&I);
1121
1122 CurInst = nullptr;
1123}
1124
1125void SelectionDAGBuilder::visitPHI(const PHINode &) {
1126 llvm_unreachable("SelectionDAGBuilder shouldn't visit PHI nodes!")__builtin_unreachable();
1127}
1128
1129void SelectionDAGBuilder::visit(unsigned Opcode, const User &I) {
1130 // Note: this doesn't use InstVisitor, because it has to work with
1131 // ConstantExpr's in addition to instructions.
1132 switch (Opcode) {
1133 default: llvm_unreachable("Unknown instruction type encountered!")__builtin_unreachable();
1134 // Build the switch statement using the Instruction.def file.
1135#define HANDLE_INST(NUM, OPCODE, CLASS) \
1136 case Instruction::OPCODE: visit##OPCODE((const CLASS&)I); break;
1137#include "llvm/IR/Instruction.def"
1138 }
1139}
1140
1141void SelectionDAGBuilder::addDanglingDebugInfo(const DbgValueInst *DI,
1142 DebugLoc DL, unsigned Order) {
1143 // We treat variadic dbg_values differently at this stage.
1144 if (DI->hasArgList()) {
1145 // For variadic dbg_values we will now insert an undef.
1146 // FIXME: We can potentially recover these!
1147 SmallVector<SDDbgOperand, 2> Locs;
1148 for (const Value *V : DI->getValues()) {
1149 auto Undef = UndefValue::get(V->getType());
1150 Locs.push_back(SDDbgOperand::fromConst(Undef));
1151 }
1152 SDDbgValue *SDV = DAG.getDbgValueList(
1153 DI->getVariable(), DI->getExpression(), Locs, {},
1154 /*IsIndirect=*/false, DL, Order, /*IsVariadic=*/true);
1155 DAG.AddDbgValue(SDV, /*isParameter=*/false);
1156 } else {
1157 // TODO: Dangling debug info will eventually either be resolved or produce
1158 // an Undef DBG_VALUE. However in the resolution case, a gap may appear
1159 // between the original dbg.value location and its resolved DBG_VALUE,
1160 // which we should ideally fill with an extra Undef DBG_VALUE.
1161 assert(DI->getNumVariableLocationOps() == 1 &&((void)0)
1162 "DbgValueInst without an ArgList should have a single location "((void)0)
1163 "operand.")((void)0);
1164 DanglingDebugInfoMap[DI->getValue(0)].emplace_back(DI, DL, Order);
1165 }
1166}
1167
1168void SelectionDAGBuilder::dropDanglingDebugInfo(const DILocalVariable *Variable,
1169 const DIExpression *Expr) {
1170 auto isMatchingDbgValue = [&](DanglingDebugInfo &DDI) {
1171 const DbgValueInst *DI = DDI.getDI();
1172 DIVariable *DanglingVariable = DI->getVariable();
1173 DIExpression *DanglingExpr = DI->getExpression();
1174 if (DanglingVariable == Variable && Expr->fragmentsOverlap(DanglingExpr)) {
1175 LLVM_DEBUG(dbgs() << "Dropping dangling debug info for " << *DI << "\n")do { } while (false);
1176 return true;
1177 }
1178 return false;
1179 };
1180
1181 for (auto &DDIMI : DanglingDebugInfoMap) {
1182 DanglingDebugInfoVector &DDIV = DDIMI.second;
1183
1184 // If debug info is to be dropped, run it through final checks to see
1185 // whether it can be salvaged.
1186 for (auto &DDI : DDIV)
1187 if (isMatchingDbgValue(DDI))
1188 salvageUnresolvedDbgValue(DDI);
1189
1190 erase_if(DDIV, isMatchingDbgValue);
1191 }
1192}
1193
1194// resolveDanglingDebugInfo - if we saw an earlier dbg_value referring to V,
1195// generate the debug data structures now that we've seen its definition.
1196void SelectionDAGBuilder::resolveDanglingDebugInfo(const Value *V,
1197 SDValue Val) {
1198 auto DanglingDbgInfoIt = DanglingDebugInfoMap.find(V);
1199 if (DanglingDbgInfoIt == DanglingDebugInfoMap.end())
1200 return;
1201
1202 DanglingDebugInfoVector &DDIV = DanglingDbgInfoIt->second;
1203 for (auto &DDI : DDIV) {
1204 const DbgValueInst *DI = DDI.getDI();
1205 assert(!DI->hasArgList() && "Not implemented for variadic dbg_values")((void)0);
1206 assert(DI && "Ill-formed DanglingDebugInfo")((void)0);
1207 DebugLoc dl = DDI.getdl();
1208 unsigned ValSDNodeOrder = Val.getNode()->getIROrder();
1209 unsigned DbgSDNodeOrder = DDI.getSDNodeOrder();
1210 DILocalVariable *Variable = DI->getVariable();
1211 DIExpression *Expr = DI->getExpression();
1212 assert(Variable->isValidLocationForIntrinsic(dl) &&((void)0)
1213 "Expected inlined-at fields to agree")((void)0);
1214 SDDbgValue *SDV;
1215 if (Val.getNode()) {
1216 // FIXME: I doubt that it is correct to resolve a dangling DbgValue as a
1217 // FuncArgumentDbgValue (it would be hoisted to the function entry, and if
1218 // we couldn't resolve it directly when examining the DbgValue intrinsic
1219 // in the first place we should not be more successful here). Unless we
1220 // have some test case that prove this to be correct we should avoid
1221 // calling EmitFuncArgumentDbgValue here.
1222 if (!EmitFuncArgumentDbgValue(V, Variable, Expr, dl, false, Val)) {
1223 LLVM_DEBUG(dbgs() << "Resolve dangling debug info [order="do { } while (false)
1224 << DbgSDNodeOrder << "] for:\n " << *DI << "\n")do { } while (false);
1225 LLVM_DEBUG(dbgs() << " By mapping to:\n "; Val.dump())do { } while (false);
1226 // Increase the SDNodeOrder for the DbgValue here to make sure it is
1227 // inserted after the definition of Val when emitting the instructions
1228 // after ISel. An alternative could be to teach
1229 // ScheduleDAGSDNodes::EmitSchedule to delay the insertion properly.
1230 LLVM_DEBUG(if (ValSDNodeOrder > DbgSDNodeOrder) dbgs()do { } while (false)
1231 << "changing SDNodeOrder from " << DbgSDNodeOrder << " to "do { } while (false)
1232 << ValSDNodeOrder << "\n")do { } while (false);
1233 SDV = getDbgValue(Val, Variable, Expr, dl,
1234 std::max(DbgSDNodeOrder, ValSDNodeOrder));
1235 DAG.AddDbgValue(SDV, false);
1236 } else
1237 LLVM_DEBUG(dbgs() << "Resolved dangling debug info for " << *DIdo { } while (false)
1238 << "in EmitFuncArgumentDbgValue\n")do { } while (false);
1239 } else {
1240 LLVM_DEBUG(dbgs() << "Dropping debug info for " << *DI << "\n")do { } while (false);
1241 auto Undef = UndefValue::get(DDI.getDI()->getValue(0)->getType());
1242 auto SDV =
1243 DAG.getConstantDbgValue(Variable, Expr, Undef, dl, DbgSDNodeOrder);
1244 DAG.AddDbgValue(SDV, false);
1245 }
1246 }
1247 DDIV.clear();
1248}
1249
1250void SelectionDAGBuilder::salvageUnresolvedDbgValue(DanglingDebugInfo &DDI) {
1251 // TODO: For the variadic implementation, instead of only checking the fail
1252 // state of `handleDebugValue`, we need know specifically which values were
1253 // invalid, so that we attempt to salvage only those values when processing
1254 // a DIArgList.
1255 assert(!DDI.getDI()->hasArgList() &&((void)0)
1256 "Not implemented for variadic dbg_values")((void)0);
1257 Value *V = DDI.getDI()->getValue(0);
1258 DILocalVariable *Var = DDI.getDI()->getVariable();
1259 DIExpression *Expr = DDI.getDI()->getExpression();
1260 DebugLoc DL = DDI.getdl();
1261 DebugLoc InstDL = DDI.getDI()->getDebugLoc();
1262 unsigned SDOrder = DDI.getSDNodeOrder();
1263 // Currently we consider only dbg.value intrinsics -- we tell the salvager
1264 // that DW_OP_stack_value is desired.
1265 assert(isa<DbgValueInst>(DDI.getDI()))((void)0);
1266 bool StackValue = true;
1267
1268 // Can this Value can be encoded without any further work?
1269 if (handleDebugValue(V, Var, Expr, DL, InstDL, SDOrder, /*IsVariadic=*/false))
1270 return;
1271
1272 // Attempt to salvage back through as many instructions as possible. Bail if
1273 // a non-instruction is seen, such as a constant expression or global
1274 // variable. FIXME: Further work could recover those too.
1275 while (isa<Instruction>(V)) {
1276 Instruction &VAsInst = *cast<Instruction>(V);
1277 // Temporary "0", awaiting real implementation.
1278 SmallVector<Value *, 4> AdditionalValues;
1279 DIExpression *SalvagedExpr =
1280 salvageDebugInfoImpl(VAsInst, Expr, StackValue, 0, AdditionalValues);
1281
1282 // If we cannot salvage any further, and haven't yet found a suitable debug
1283 // expression, bail out.
1284 // TODO: If AdditionalValues isn't empty, then the salvage can only be
1285 // represented with a DBG_VALUE_LIST, so we give up. When we have support
1286 // here for variadic dbg_values, remove that condition.
1287 if (!SalvagedExpr || !AdditionalValues.empty())
1288 break;
1289
1290 // New value and expr now represent this debuginfo.
1291 V = VAsInst.getOperand(0);
1292 Expr = SalvagedExpr;
1293
1294 // Some kind of simplification occurred: check whether the operand of the
1295 // salvaged debug expression can be encoded in this DAG.
1296 if (handleDebugValue(V, Var, Expr, DL, InstDL, SDOrder,
1297 /*IsVariadic=*/false)) {
1298 LLVM_DEBUG(dbgs() << "Salvaged debug location info for:\n "do { } while (false)
1299 << DDI.getDI() << "\nBy stripping back to:\n " << V)do { } while (false);
1300 return;
1301 }
1302 }
1303
1304 // This was the final opportunity to salvage this debug information, and it
1305 // couldn't be done. Place an undef DBG_VALUE at this location to terminate
1306 // any earlier variable location.
1307 auto Undef = UndefValue::get(DDI.getDI()->getValue(0)->getType());
1308 auto SDV = DAG.getConstantDbgValue(Var, Expr, Undef, DL, SDNodeOrder);
1309 DAG.AddDbgValue(SDV, false);
1310
1311 LLVM_DEBUG(dbgs() << "Dropping debug value info for:\n " << DDI.getDI()do { } while (false)
1312 << "\n")do { } while (false);
1313 LLVM_DEBUG(dbgs() << " Last seen at:\n " << *DDI.getDI()->getOperand(0)do { } while (false)
1314 << "\n")do { } while (false);
1315}
1316
1317bool SelectionDAGBuilder::handleDebugValue(ArrayRef<const Value *> Values,
1318 DILocalVariable *Var,
1319 DIExpression *Expr, DebugLoc dl,
1320 DebugLoc InstDL, unsigned Order,
1321 bool IsVariadic) {
1322 if (Values.empty())
1323 return true;
1324 SmallVector<SDDbgOperand> LocationOps;
1325 SmallVector<SDNode *> Dependencies;
1326 for (const Value *V : Values) {
1327 // Constant value.
1328 if (isa<ConstantInt>(V) || isa<ConstantFP>(V) || isa<UndefValue>(V) ||
1329 isa<ConstantPointerNull>(V)) {
1330 LocationOps.emplace_back(SDDbgOperand::fromConst(V));
1331 continue;
1332 }
1333
1334 // If the Value is a frame index, we can create a FrameIndex debug value
1335 // without relying on the DAG at all.
1336 if (const AllocaInst *AI = dyn_cast<AllocaInst>(V)) {
1337 auto SI = FuncInfo.StaticAllocaMap.find(AI);
1338 if (SI != FuncInfo.StaticAllocaMap.end()) {
1339 LocationOps.emplace_back(SDDbgOperand::fromFrameIdx(SI->second));
1340 continue;
1341 }
1342 }
1343
1344 // Do not use getValue() in here; we don't want to generate code at
1345 // this point if it hasn't been done yet.
1346 SDValue N = NodeMap[V];
1347 if (!N.getNode() && isa<Argument>(V)) // Check unused arguments map.
1348 N = UnusedArgNodeMap[V];
1349 if (N.getNode()) {
1350 // Only emit func arg dbg value for non-variadic dbg.values for now.
1351 if (!IsVariadic && EmitFuncArgumentDbgValue(V, Var, Expr, dl, false, N))
1352 return true;
1353 if (auto *FISDN = dyn_cast<FrameIndexSDNode>(N.getNode())) {
1354 // Construct a FrameIndexDbgValue for FrameIndexSDNodes so we can
1355 // describe stack slot locations.
1356 //
1357 // Consider "int x = 0; int *px = &x;". There are two kinds of
1358 // interesting debug values here after optimization:
1359 //
1360 // dbg.value(i32* %px, !"int *px", !DIExpression()), and
1361 // dbg.value(i32* %px, !"int x", !DIExpression(DW_OP_deref))
1362 //
1363 // Both describe the direct values of their associated variables.
1364 Dependencies.push_back(N.getNode());
1365 LocationOps.emplace_back(SDDbgOperand::fromFrameIdx(FISDN->getIndex()));
1366 continue;
1367 }
1368 LocationOps.emplace_back(
1369 SDDbgOperand::fromNode(N.getNode(), N.getResNo()));
1370 continue;
1371 }
1372
1373 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
1374 // Special rules apply for the first dbg.values of parameter variables in a
1375 // function. Identify them by the fact they reference Argument Values, that
1376 // they're parameters, and they are parameters of the current function. We
1377 // need to let them dangle until they get an SDNode.
1378 bool IsParamOfFunc =
1379 isa<Argument>(V) && Var->isParameter() && !InstDL.getInlinedAt();
1380 if (IsParamOfFunc)
1381 return false;
1382
1383 // The value is not used in this block yet (or it would have an SDNode).
1384 // We still want the value to appear for the user if possible -- if it has
1385 // an associated VReg, we can refer to that instead.
1386 auto VMI = FuncInfo.ValueMap.find(V);
1387 if (VMI != FuncInfo.ValueMap.end()) {
1388 unsigned Reg = VMI->second;
1389 // If this is a PHI node, it may be split up into several MI PHI nodes
1390 // (in FunctionLoweringInfo::set).
1391 RegsForValue RFV(V->getContext(), TLI, DAG.getDataLayout(), Reg,
1392 V->getType(), None);
1393 if (RFV.occupiesMultipleRegs()) {
1394 // FIXME: We could potentially support variadic dbg_values here.
1395 if (IsVariadic)
1396 return false;
1397 unsigned Offset = 0;
1398 unsigned BitsToDescribe = 0;
1399 if (auto VarSize = Var->getSizeInBits())
1400 BitsToDescribe = *VarSize;
1401 if (auto Fragment = Expr->getFragmentInfo())
1402 BitsToDescribe = Fragment->SizeInBits;
1403 for (auto RegAndSize : RFV.getRegsAndSizes()) {
1404 // Bail out if all bits are described already.
1405 if (Offset >= BitsToDescribe)
1406 break;
1407 // TODO: handle scalable vectors.
1408 unsigned RegisterSize = RegAndSize.second;
1409 unsigned FragmentSize = (Offset + RegisterSize > BitsToDescribe)
1410 ? BitsToDescribe - Offset
1411 : RegisterSize;
1412 auto FragmentExpr = DIExpression::createFragmentExpression(
1413 Expr, Offset, FragmentSize);
1414 if (!FragmentExpr)
1415 continue;
1416 SDDbgValue *SDV = DAG.getVRegDbgValue(
1417 Var, *FragmentExpr, RegAndSize.first, false, dl, SDNodeOrder);
1418 DAG.AddDbgValue(SDV, false);
1419 Offset += RegisterSize;
1420 }
1421 return true;
1422 }
1423 // We can use simple vreg locations for variadic dbg_values as well.
1424 LocationOps.emplace_back(SDDbgOperand::fromVReg(Reg));
1425 continue;
1426 }
1427 // We failed to create a SDDbgOperand for V.
1428 return false;
1429 }
1430
1431 // We have created a SDDbgOperand for each Value in Values.
1432 // Should use Order instead of SDNodeOrder?
1433 assert(!LocationOps.empty())((void)0);
1434 SDDbgValue *SDV =
1435 DAG.getDbgValueList(Var, Expr, LocationOps, Dependencies,
1436 /*IsIndirect=*/false, dl, SDNodeOrder, IsVariadic);
1437 DAG.AddDbgValue(SDV, /*isParameter=*/false);
1438 return true;
1439}
1440
1441void SelectionDAGBuilder::resolveOrClearDbgInfo() {
1442 // Try to fixup any remaining dangling debug info -- and drop it if we can't.
1443 for (auto &Pair : DanglingDebugInfoMap)
1444 for (auto &DDI : Pair.second)
1445 salvageUnresolvedDbgValue(DDI);
1446 clearDanglingDebugInfo();
1447}
1448
1449/// getCopyFromRegs - If there was virtual register allocated for the value V
1450/// emit CopyFromReg of the specified type Ty. Return empty SDValue() otherwise.
1451SDValue SelectionDAGBuilder::getCopyFromRegs(const Value *V, Type *Ty) {
1452 DenseMap<const Value *, Register>::iterator It = FuncInfo.ValueMap.find(V);
1453 SDValue Result;
1454
1455 if (It != FuncInfo.ValueMap.end()) {
1456 Register InReg = It->second;
1457
1458 RegsForValue RFV(*DAG.getContext(), DAG.getTargetLoweringInfo(),
1459 DAG.getDataLayout(), InReg, Ty,
1460 None); // This is not an ABI copy.
1461 SDValue Chain = DAG.getEntryNode();
1462 Result = RFV.getCopyFromRegs(DAG, FuncInfo, getCurSDLoc(), Chain, nullptr,
1463 V);
1464 resolveDanglingDebugInfo(V, Result);
1465 }
1466
1467 return Result;
1468}
1469
1470/// getValue - Return an SDValue for the given Value.
1471SDValue SelectionDAGBuilder::getValue(const Value *V) {
1472 // If we already have an SDValue for this value, use it. It's important
1473 // to do this first, so that we don't create a CopyFromReg if we already
1474 // have a regular SDValue.
1475 SDValue &N = NodeMap[V];
1476 if (N.getNode()) return N;
1477
1478 // If there's a virtual register allocated and initialized for this
1479 // value, use it.
1480 if (SDValue copyFromReg = getCopyFromRegs(V, V->getType()))
1481 return copyFromReg;
1482
1483 // Otherwise create a new SDValue and remember it.
1484 SDValue Val = getValueImpl(V);
1485 NodeMap[V] = Val;
1486 resolveDanglingDebugInfo(V, Val);
1487 return Val;
1488}
1489
1490/// getNonRegisterValue - Return an SDValue for the given Value, but
1491/// don't look in FuncInfo.ValueMap for a virtual register.
1492SDValue SelectionDAGBuilder::getNonRegisterValue(const Value *V) {
1493 // If we already have an SDValue for this value, use it.
1494 SDValue &N = NodeMap[V];
1495 if (N.getNode()) {
1496 if (isa<ConstantSDNode>(N) || isa<ConstantFPSDNode>(N)) {
1497 // Remove the debug location from the node as the node is about to be used
1498 // in a location which may differ from the original debug location. This
1499 // is relevant to Constant and ConstantFP nodes because they can appear
1500 // as constant expressions inside PHI nodes.
1501 N->setDebugLoc(DebugLoc());
1502 }
1503 return N;
1504 }
1505
1506 // Otherwise create a new SDValue and remember it.
1507 SDValue Val = getValueImpl(V);
1508 NodeMap[V] = Val;
1509 resolveDanglingDebugInfo(V, Val);
1510 return Val;
1511}
1512
1513/// getValueImpl - Helper function for getValue and getNonRegisterValue.
1514/// Create an SDValue for the given value.
1515SDValue SelectionDAGBuilder::getValueImpl(const Value *V) {
1516 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
1517
1518 if (const Constant *C = dyn_cast<Constant>(V)) {
1519 EVT VT = TLI.getValueType(DAG.getDataLayout(), V->getType(), true);
1520
1521 if (const ConstantInt *CI = dyn_cast<ConstantInt>(C))
1522 return DAG.getConstant(*CI, getCurSDLoc(), VT);
1523
1524 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
1525 return DAG.getGlobalAddress(GV, getCurSDLoc(), VT);
1526
1527 if (isa<ConstantPointerNull>(C)) {
1528 unsigned AS = V->getType()->getPointerAddressSpace();
1529 return DAG.getConstant(0, getCurSDLoc(),
1530 TLI.getPointerTy(DAG.getDataLayout(), AS));
1531 }
1532
1533 if (match(C, m_VScale(DAG.getDataLayout())))
1534 return DAG.getVScale(getCurSDLoc(), VT, APInt(VT.getSizeInBits(), 1));
1535
1536 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C))
1537 return DAG.getConstantFP(*CFP, getCurSDLoc(), VT);
1538
1539 if (isa<UndefValue>(C) && !V->getType()->isAggregateType())
1540 return DAG.getUNDEF(VT);
1541
1542 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
1543 visit(CE->getOpcode(), *CE);
1544 SDValue N1 = NodeMap[V];
1545 assert(N1.getNode() && "visit didn't populate the NodeMap!")((void)0);
1546 return N1;
1547 }
1548
1549 if (isa<ConstantStruct>(C) || isa<ConstantArray>(C)) {
1550 SmallVector<SDValue, 4> Constants;
1551 for (const Use &U : C->operands()) {
1552 SDNode *Val = getValue(U).getNode();
1553 // If the operand is an empty aggregate, there are no values.
1554 if (!Val) continue;
1555 // Add each leaf value from the operand to the Constants list
1556 // to form a flattened list of all the values.
1557 for (unsigned i = 0, e = Val->getNumValues(); i != e; ++i)
1558 Constants.push_back(SDValue(Val, i));
1559 }
1560
1561 return DAG.getMergeValues(Constants, getCurSDLoc());
1562 }
1563
1564 if (const ConstantDataSequential *CDS =
1565 dyn_cast<ConstantDataSequential>(C)) {
1566 SmallVector<SDValue, 4> Ops;
1567 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1568 SDNode *Val = getValue(CDS->getElementAsConstant(i)).getNode();
1569 // Add each leaf value from the operand to the Constants list
1570 // to form a flattened list of all the values.
1571 for (unsigned i = 0, e = Val->getNumValues(); i != e; ++i)
1572 Ops.push_back(SDValue(Val, i));
1573 }
1574
1575 if (isa<ArrayType>(CDS->getType()))
1576 return DAG.getMergeValues(Ops, getCurSDLoc());
1577 return NodeMap[V] = DAG.getBuildVector(VT, getCurSDLoc(), Ops);
1578 }
1579
1580 if (C->getType()->isStructTy() || C->getType()->isArrayTy()) {
1581 assert((isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) &&((void)0)
1582 "Unknown struct or array constant!")((void)0);
1583
1584 SmallVector<EVT, 4> ValueVTs;
1585 ComputeValueVTs(TLI, DAG.getDataLayout(), C->getType(), ValueVTs);
1586 unsigned NumElts = ValueVTs.size();
1587 if (NumElts == 0)
1588 return SDValue(); // empty struct
1589 SmallVector<SDValue, 4> Constants(NumElts);
1590 for (unsigned i = 0; i != NumElts; ++i) {
1591 EVT EltVT = ValueVTs[i];
1592 if (isa<UndefValue>(C))
1593 Constants[i] = DAG.getUNDEF(EltVT);
1594 else if (EltVT.isFloatingPoint())
1595 Constants[i] = DAG.getConstantFP(0, getCurSDLoc(), EltVT);
1596 else
1597 Constants[i] = DAG.getConstant(0, getCurSDLoc(), EltVT);
1598 }
1599
1600 return DAG.getMergeValues(Constants, getCurSDLoc());
1601 }
1602
1603 if (const BlockAddress *BA = dyn_cast<BlockAddress>(C))
1604 return DAG.getBlockAddress(BA, VT);
1605
1606 if (const auto *Equiv = dyn_cast<DSOLocalEquivalent>(C))
1607 return getValue(Equiv->getGlobalValue());
1608
1609 VectorType *VecTy = cast<VectorType>(V->getType());
1610
1611 // Now that we know the number and type of the elements, get that number of
1612 // elements into the Ops array based on what kind of constant it is.
1613 if (const ConstantVector *CV = dyn_cast<ConstantVector>(C)) {
1614 SmallVector<SDValue, 16> Ops;
1615 unsigned NumElements = cast<FixedVectorType>(VecTy)->getNumElements();
1616 for (unsigned i = 0; i != NumElements; ++i)
1617 Ops.push_back(getValue(CV->getOperand(i)));
1618
1619 return NodeMap[V] = DAG.getBuildVector(VT, getCurSDLoc(), Ops);
1620 } else if (isa<ConstantAggregateZero>(C)) {
1621 EVT EltVT =
1622 TLI.getValueType(DAG.getDataLayout(), VecTy->getElementType());
1623
1624 SDValue Op;
1625 if (EltVT.isFloatingPoint())
1626 Op = DAG.getConstantFP(0, getCurSDLoc(), EltVT);
1627 else
1628 Op = DAG.getConstant(0, getCurSDLoc(), EltVT);
1629
1630 if (isa<ScalableVectorType>(VecTy))
1631 return NodeMap[V] = DAG.getSplatVector(VT, getCurSDLoc(), Op);
1632 else {
1633 SmallVector<SDValue, 16> Ops;
1634 Ops.assign(cast<FixedVectorType>(VecTy)->getNumElements(), Op);
1635 return NodeMap[V] = DAG.getBuildVector(VT, getCurSDLoc(), Ops);
1636 }
1637 }
1638 llvm_unreachable("Unknown vector constant")__builtin_unreachable();
1639 }
1640
1641 // If this is a static alloca, generate it as the frameindex instead of
1642 // computation.
1643 if (const AllocaInst *AI = dyn_cast<AllocaInst>(V)) {
1644 DenseMap<const AllocaInst*, int>::iterator SI =
1645 FuncInfo.StaticAllocaMap.find(AI);
1646 if (SI != FuncInfo.StaticAllocaMap.end())
1647 return DAG.getFrameIndex(SI->second,
1648 TLI.getFrameIndexTy(DAG.getDataLayout()));
1649 }
1650
1651 // If this is an instruction which fast-isel has deferred, select it now.
1652 if (const Instruction *Inst = dyn_cast<Instruction>(V)) {
1653 unsigned InReg = FuncInfo.InitializeRegForValue(Inst);
1654
1655 RegsForValue RFV(*DAG.getContext(), TLI, DAG.getDataLayout(), InReg,
1656 Inst->getType(), None);
1657 SDValue Chain = DAG.getEntryNode();
1658 return RFV.getCopyFromRegs(DAG, FuncInfo, getCurSDLoc(), Chain, nullptr, V);
1659 }
1660
1661 if (const MetadataAsValue *MD = dyn_cast<MetadataAsValue>(V)) {
1662 return DAG.getMDNode(cast<MDNode>(MD->getMetadata()));
1663 }
1664 llvm_unreachable("Can't get register for value!")__builtin_unreachable();
1665}
1666
1667void SelectionDAGBuilder::visitCatchPad(const CatchPadInst &I) {
1668 auto Pers = classifyEHPersonality(FuncInfo.Fn->getPersonalityFn());
1669 bool IsMSVCCXX = Pers == EHPersonality::MSVC_CXX;
1670 bool IsCoreCLR = Pers == EHPersonality::CoreCLR;
1671 bool IsSEH = isAsynchronousEHPersonality(Pers);
1672 MachineBasicBlock *CatchPadMBB = FuncInfo.MBB;
1673 if (!IsSEH)
1674 CatchPadMBB->setIsEHScopeEntry();
1675 // In MSVC C++ and CoreCLR, catchblocks are funclets and need prologues.
1676 if (IsMSVCCXX || IsCoreCLR)
1677 CatchPadMBB->setIsEHFuncletEntry();
1678}
1679
1680void SelectionDAGBuilder::visitCatchRet(const CatchReturnInst &I) {
1681 // Update machine-CFG edge.
1682 MachineBasicBlock *TargetMBB = FuncInfo.MBBMap[I.getSuccessor()];
1683 FuncInfo.MBB->addSuccessor(TargetMBB);
1684 TargetMBB->setIsEHCatchretTarget(true);
1685 DAG.getMachineFunction().setHasEHCatchret(true);
1686
1687 auto Pers = classifyEHPersonality(FuncInfo.Fn->getPersonalityFn());
1688 bool IsSEH = isAsynchronousEHPersonality(Pers);
1689 if (IsSEH) {
1690 // If this is not a fall-through branch or optimizations are switched off,
1691 // emit the branch.
1692 if (TargetMBB != NextBlock(FuncInfo.MBB) ||
1693 TM.getOptLevel() == CodeGenOpt::None)
1694 DAG.setRoot(DAG.getNode(ISD::BR, getCurSDLoc(), MVT::Other,
1695 getControlRoot(), DAG.getBasicBlock(TargetMBB)));
1696 return;
1697 }
1698
1699 // Figure out the funclet membership for the catchret's successor.
1700 // This will be used by the FuncletLayout pass to determine how to order the
1701 // BB's.
1702 // A 'catchret' returns to the outer scope's color.
1703 Value *ParentPad = I.getCatchSwitchParentPad();
1704 const BasicBlock *SuccessorColor;
1705 if (isa<ConstantTokenNone>(ParentPad))
1706 SuccessorColor = &FuncInfo.Fn->getEntryBlock();
1707 else
1708 SuccessorColor = cast<Instruction>(ParentPad)->getParent();
1709 assert(SuccessorColor && "No parent funclet for catchret!")((void)0);
1710 MachineBasicBlock *SuccessorColorMBB = FuncInfo.MBBMap[SuccessorColor];
1711 assert(SuccessorColorMBB && "No MBB for SuccessorColor!")((void)0);
1712
1713 // Create the terminator node.
1714 SDValue Ret = DAG.getNode(ISD::CATCHRET, getCurSDLoc(), MVT::Other,
1715 getControlRoot(), DAG.getBasicBlock(TargetMBB),
1716 DAG.getBasicBlock(SuccessorColorMBB));
1717 DAG.setRoot(Ret);
1718}
1719
1720void SelectionDAGBuilder::visitCleanupPad(const CleanupPadInst &CPI) {
1721 // Don't emit any special code for the cleanuppad instruction. It just marks
1722 // the start of an EH scope/funclet.
1723 FuncInfo.MBB->setIsEHScopeEntry();
1724 auto Pers = classifyEHPersonality(FuncInfo.Fn->getPersonalityFn());
1725 if (Pers != EHPersonality::Wasm_CXX) {
1726 FuncInfo.MBB->setIsEHFuncletEntry();
1727 FuncInfo.MBB->setIsCleanupFuncletEntry();
1728 }
1729}
1730
1731// In wasm EH, even though a catchpad may not catch an exception if a tag does
1732// not match, it is OK to add only the first unwind destination catchpad to the
1733// successors, because there will be at least one invoke instruction within the
1734// catch scope that points to the next unwind destination, if one exists, so
1735// CFGSort cannot mess up with BB sorting order.
1736// (All catchpads with 'catch (type)' clauses have a 'llvm.rethrow' intrinsic
1737// call within them, and catchpads only consisting of 'catch (...)' have a
1738// '__cxa_end_catch' call within them, both of which generate invokes in case
1739// the next unwind destination exists, i.e., the next unwind destination is not
1740// the caller.)
1741//
1742// Having at most one EH pad successor is also simpler and helps later
1743// transformations.
1744//
1745// For example,
1746// current:
1747// invoke void @foo to ... unwind label %catch.dispatch
1748// catch.dispatch:
1749// %0 = catchswitch within ... [label %catch.start] unwind label %next
1750// catch.start:
1751// ...
1752// ... in this BB or some other child BB dominated by this BB there will be an
1753// invoke that points to 'next' BB as an unwind destination
1754//
1755// next: ; We don't need to add this to 'current' BB's successor
1756// ...
1757static void findWasmUnwindDestinations(
1758 FunctionLoweringInfo &FuncInfo, const BasicBlock *EHPadBB,
1759 BranchProbability Prob,
1760 SmallVectorImpl<std::pair<MachineBasicBlock *, BranchProbability>>
1761 &UnwindDests) {
1762 while (EHPadBB) {
1763 const Instruction *Pad = EHPadBB->getFirstNonPHI();
1764 if (isa<CleanupPadInst>(Pad)) {
1765 // Stop on cleanup pads.
1766 UnwindDests.emplace_back(FuncInfo.MBBMap[EHPadBB], Prob);
1767 UnwindDests.back().first->setIsEHScopeEntry();
1768 break;
1769 } else if (auto *CatchSwitch = dyn_cast<CatchSwitchInst>(Pad)) {
1770 // Add the catchpad handlers to the possible destinations. We don't
1771 // continue to the unwind destination of the catchswitch for wasm.
1772 for (const BasicBlock *CatchPadBB : CatchSwitch->handlers()) {
1773 UnwindDests.emplace_back(FuncInfo.MBBMap[CatchPadBB], Prob);
1774 UnwindDests.back().first->setIsEHScopeEntry();
1775 }
1776 break;
1777 } else {
1778 continue;
1779 }
1780 }
1781}
1782
1783/// When an invoke or a cleanupret unwinds to the next EH pad, there are
1784/// many places it could ultimately go. In the IR, we have a single unwind
1785/// destination, but in the machine CFG, we enumerate all the possible blocks.
1786/// This function skips over imaginary basic blocks that hold catchswitch
1787/// instructions, and finds all the "real" machine
1788/// basic block destinations. As those destinations may not be successors of
1789/// EHPadBB, here we also calculate the edge probability to those destinations.
1790/// The passed-in Prob is the edge probability to EHPadBB.
1791static void findUnwindDestinations(
1792 FunctionLoweringInfo &FuncInfo, const BasicBlock *EHPadBB,
1793 BranchProbability Prob,
1794 SmallVectorImpl<std::pair<MachineBasicBlock *, BranchProbability>>
1795 &UnwindDests) {
1796 EHPersonality Personality =
1797 classifyEHPersonality(FuncInfo.Fn->getPersonalityFn());
1798 bool IsMSVCCXX = Personality == EHPersonality::MSVC_CXX;
1799 bool IsCoreCLR = Personality == EHPersonality::CoreCLR;
1800 bool IsWasmCXX = Personality == EHPersonality::Wasm_CXX;
1801 bool IsSEH = isAsynchronousEHPersonality(Personality);
1802
1803 if (IsWasmCXX) {
1804 findWasmUnwindDestinations(FuncInfo, EHPadBB, Prob, UnwindDests);
1805 assert(UnwindDests.size() <= 1 &&((void)0)
1806 "There should be at most one unwind destination for wasm")((void)0);
1807 return;
1808 }
1809
1810 while (EHPadBB) {
1811 const Instruction *Pad = EHPadBB->getFirstNonPHI();
1812 BasicBlock *NewEHPadBB = nullptr;
1813 if (isa<LandingPadInst>(Pad)) {
1814 // Stop on landingpads. They are not funclets.
1815 UnwindDests.emplace_back(FuncInfo.MBBMap[EHPadBB], Prob);
1816 break;
1817 } else if (isa<CleanupPadInst>(Pad)) {
1818 // Stop on cleanup pads. Cleanups are always funclet entries for all known
1819 // personalities.
1820 UnwindDests.emplace_back(FuncInfo.MBBMap[EHPadBB], Prob);
1821 UnwindDests.back().first->setIsEHScopeEntry();
1822 UnwindDests.back().first->setIsEHFuncletEntry();
1823 break;
1824 } else if (auto *CatchSwitch = dyn_cast<CatchSwitchInst>(Pad)) {
1825 // Add the catchpad handlers to the possible destinations.
1826 for (const BasicBlock *CatchPadBB : CatchSwitch->handlers()) {
1827 UnwindDests.emplace_back(FuncInfo.MBBMap[CatchPadBB], Prob);
1828 // For MSVC++ and the CLR, catchblocks are funclets and need prologues.
1829 if (IsMSVCCXX || IsCoreCLR)
1830 UnwindDests.back().first->setIsEHFuncletEntry();
1831 if (!IsSEH)
1832 UnwindDests.back().first->setIsEHScopeEntry();
1833 }
1834 NewEHPadBB = CatchSwitch->getUnwindDest();
1835 } else {
1836 continue;
1837 }
1838
1839 BranchProbabilityInfo *BPI = FuncInfo.BPI;
1840 if (BPI && NewEHPadBB)
1841 Prob *= BPI->getEdgeProbability(EHPadBB, NewEHPadBB);
1842 EHPadBB = NewEHPadBB;
1843 }
1844}
1845
1846void SelectionDAGBuilder::visitCleanupRet(const CleanupReturnInst &I) {
1847 // Update successor info.
1848 SmallVector<std::pair<MachineBasicBlock *, BranchProbability>, 1> UnwindDests;
1849 auto UnwindDest = I.getUnwindDest();
1850 BranchProbabilityInfo *BPI = FuncInfo.BPI;
1851 BranchProbability UnwindDestProb =
1852 (BPI && UnwindDest)
1853 ? BPI->getEdgeProbability(FuncInfo.MBB->getBasicBlock(), UnwindDest)
1854 : BranchProbability::getZero();
1855 findUnwindDestinations(FuncInfo, UnwindDest, UnwindDestProb, UnwindDests);
1856 for (auto &UnwindDest : UnwindDests) {
1857 UnwindDest.first->setIsEHPad();
1858 addSuccessorWithProb(FuncInfo.MBB, UnwindDest.first, UnwindDest.second);
1859 }
1860 FuncInfo.MBB->normalizeSuccProbs();
1861
1862 // Create the terminator node.
1863 SDValue Ret =
1864 DAG.getNode(ISD::CLEANUPRET, getCurSDLoc(), MVT::Other, getControlRoot());
1865 DAG.setRoot(Ret);
1866}
1867
1868void SelectionDAGBuilder::visitCatchSwitch(const CatchSwitchInst &CSI) {
1869 report_fatal_error("visitCatchSwitch not yet implemented!");
1870}
1871
1872void SelectionDAGBuilder::visitRet(const ReturnInst &I) {
1873 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
1874 auto &DL = DAG.getDataLayout();
1875 SDValue Chain = getControlRoot();
1876 SmallVector<ISD::OutputArg, 8> Outs;
1877 SmallVector<SDValue, 8> OutVals;
1878
1879 // Calls to @llvm.experimental.deoptimize don't generate a return value, so
1880 // lower
1881 //
1882 // %val = call <ty> @llvm.experimental.deoptimize()
1883 // ret <ty> %val
1884 //
1885 // differently.
1886 if (I.getParent()->getTerminatingDeoptimizeCall()) {
1887 LowerDeoptimizingReturn();
1888 return;
1889 }
1890
1891 if (!FuncInfo.CanLowerReturn) {
1892 unsigned DemoteReg = FuncInfo.DemoteRegister;
1893 const Function *F = I.getParent()->getParent();
1894
1895 // Emit a store of the return value through the virtual register.
1896 // Leave Outs empty so that LowerReturn won't try to load return
1897 // registers the usual way.
1898 SmallVector<EVT, 1> PtrValueVTs;
1899 ComputeValueVTs(TLI, DL,
1900 F->getReturnType()->getPointerTo(
1901 DAG.getDataLayout().getAllocaAddrSpace()),
1902 PtrValueVTs);
1903
1904 SDValue RetPtr = DAG.getCopyFromReg(DAG.getEntryNode(), getCurSDLoc(),
1905 DemoteReg, PtrValueVTs[0]);
1906 SDValue RetOp = getValue(I.getOperand(0));
1907
1908 SmallVector<EVT, 4> ValueVTs, MemVTs;
1909 SmallVector<uint64_t, 4> Offsets;
1910 ComputeValueVTs(TLI, DL, I.getOperand(0)->getType(), ValueVTs, &MemVTs,
1911 &Offsets);
1912 unsigned NumValues = ValueVTs.size();
1913
1914 SmallVector<SDValue, 4> Chains(NumValues);
1915 Align BaseAlign = DL.getPrefTypeAlign(I.getOperand(0)->getType());
1916 for (unsigned i = 0; i != NumValues; ++i) {
1917 // An aggregate return value cannot wrap around the address space, so
1918 // offsets to its parts don't wrap either.
1919 SDValue Ptr = DAG.getObjectPtrOffset(getCurSDLoc(), RetPtr,
1920 TypeSize::Fixed(Offsets[i]));
1921
1922 SDValue Val = RetOp.getValue(RetOp.getResNo() + i);
1923 if (MemVTs[i] != ValueVTs[i])
1924 Val = DAG.getPtrExtOrTrunc(Val, getCurSDLoc(), MemVTs[i]);
1925 Chains[i] = DAG.getStore(
1926 Chain, getCurSDLoc(), Val,
1927 // FIXME: better loc info would be nice.
1928 Ptr, MachinePointerInfo::getUnknownStack(DAG.getMachineFunction()),
1929 commonAlignment(BaseAlign, Offsets[i]));
1930 }
1931
1932 Chain = DAG.getNode(ISD::TokenFactor, getCurSDLoc(),
1933 MVT::Other, Chains);
1934 } else if (I.getNumOperands() != 0) {
1935 SmallVector<EVT, 4> ValueVTs;
1936 ComputeValueVTs(TLI, DL, I.getOperand(0)->getType(), ValueVTs);
1937 unsigned NumValues = ValueVTs.size();
1938 if (NumValues) {
1939 SDValue RetOp = getValue(I.getOperand(0));
1940
1941 const Function *F = I.getParent()->getParent();
1942
1943 bool NeedsRegBlock = TLI.functionArgumentNeedsConsecutiveRegisters(
1944 I.getOperand(0)->getType(), F->getCallingConv(),
1945 /*IsVarArg*/ false, DL);
1946
1947 ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
1948 if (F->getAttributes().hasAttribute(AttributeList::ReturnIndex,
1949 Attribute::SExt))
1950 ExtendKind = ISD::SIGN_EXTEND;
1951 else if (F->getAttributes().hasAttribute(AttributeList::ReturnIndex,
1952 Attribute::ZExt))
1953 ExtendKind = ISD::ZERO_EXTEND;
1954
1955 LLVMContext &Context = F->getContext();
1956 bool RetInReg = F->getAttributes().hasAttribute(
1957 AttributeList::ReturnIndex, Attribute::InReg);
1958
1959 for (unsigned j = 0; j != NumValues; ++j) {
1960 EVT VT = ValueVTs[j];
1961
1962 if (ExtendKind != ISD::ANY_EXTEND && VT.isInteger())
1963 VT = TLI.getTypeForExtReturn(Context, VT, ExtendKind);
1964
1965 CallingConv::ID CC = F->getCallingConv();
1966
1967 unsigned NumParts = TLI.getNumRegistersForCallingConv(Context, CC, VT);
1968 MVT PartVT = TLI.getRegisterTypeForCallingConv(Context, CC, VT);
1969 SmallVector<SDValue, 4> Parts(NumParts);
1970 getCopyToParts(DAG, getCurSDLoc(),
1971 SDValue(RetOp.getNode(), RetOp.getResNo() + j),
1972 &Parts[0], NumParts, PartVT, &I, CC, ExtendKind);
1973
1974 // 'inreg' on function refers to return value
1975 ISD::ArgFlagsTy Flags = ISD::ArgFlagsTy();
1976 if (RetInReg)
1977 Flags.setInReg();
1978
1979 if (I.getOperand(0)->getType()->isPointerTy()) {
1980 Flags.setPointer();
1981 Flags.setPointerAddrSpace(
1982 cast<PointerType>(I.getOperand(0)->getType())->getAddressSpace());
1983 }
1984
1985 if (NeedsRegBlock) {
1986 Flags.setInConsecutiveRegs();
1987 if (j == NumValues - 1)
1988 Flags.setInConsecutiveRegsLast();
1989 }
1990
1991 // Propagate extension type if any
1992 if (ExtendKind == ISD::SIGN_EXTEND)
1993 Flags.setSExt();
1994 else if (ExtendKind == ISD::ZERO_EXTEND)
1995 Flags.setZExt();
1996
1997 for (unsigned i = 0; i < NumParts; ++i) {
1998 Outs.push_back(ISD::OutputArg(Flags, Parts[i].getValueType(),
1999 VT, /*isfixed=*/true, 0, 0));
2000 OutVals.push_back(Parts[i]);
2001 }
2002 }
2003 }
2004 }
2005
2006 // Push in swifterror virtual register as the last element of Outs. This makes
2007 // sure swifterror virtual register will be returned in the swifterror
2008 // physical register.
2009 const Function *F = I.getParent()->getParent();
2010 if (TLI.supportSwiftError() &&
2011 F->getAttributes().hasAttrSomewhere(Attribute::SwiftError)) {
2012 assert(SwiftError.getFunctionArg() && "Need a swift error argument")((void)0);
2013 ISD::ArgFlagsTy Flags = ISD::ArgFlagsTy();
2014 Flags.setSwiftError();
2015 Outs.push_back(ISD::OutputArg(Flags, EVT(TLI.getPointerTy(DL)) /*vt*/,
2016 EVT(TLI.getPointerTy(DL)) /*argvt*/,
2017 true /*isfixed*/, 1 /*origidx*/,
2018 0 /*partOffs*/));
2019 // Create SDNode for the swifterror virtual register.
2020 OutVals.push_back(
2021 DAG.getRegister(SwiftError.getOrCreateVRegUseAt(
2022 &I, FuncInfo.MBB, SwiftError.getFunctionArg()),
2023 EVT(TLI.getPointerTy(DL))));
2024 }
2025
2026 bool isVarArg = DAG.getMachineFunction().getFunction().isVarArg();
2027 CallingConv::ID CallConv =
2028 DAG.getMachineFunction().getFunction().getCallingConv();
2029 Chain = DAG.getTargetLoweringInfo().LowerReturn(
2030 Chain, CallConv, isVarArg, Outs, OutVals, getCurSDLoc(), DAG);
2031
2032 // Verify that the target's LowerReturn behaved as expected.
2033 assert(Chain.getNode() && Chain.getValueType() == MVT::Other &&((void)0)
2034 "LowerReturn didn't return a valid chain!")((void)0);
2035
2036 // Update the DAG with the new chain value resulting from return lowering.
2037 DAG.setRoot(Chain);
2038}
2039
2040/// CopyToExportRegsIfNeeded - If the given value has virtual registers
2041/// created for it, emit nodes to copy the value into the virtual
2042/// registers.
2043void SelectionDAGBuilder::CopyToExportRegsIfNeeded(const Value *V) {
2044 // Skip empty types
2045 if (V->getType()->isEmptyTy())
2046 return;
2047
2048 DenseMap<const Value *, Register>::iterator VMI = FuncInfo.ValueMap.find(V);
2049 if (VMI != FuncInfo.ValueMap.end()) {
2050 assert(!V->use_empty() && "Unused value assigned virtual registers!")((void)0);
2051 CopyValueToVirtualRegister(V, VMI->second);
2052 }
2053}
2054
2055/// ExportFromCurrentBlock - If this condition isn't known to be exported from
2056/// the current basic block, add it to ValueMap now so that we'll get a
2057/// CopyTo/FromReg.
2058void SelectionDAGBuilder::ExportFromCurrentBlock(const Value *V) {
2059 // No need to export constants.
2060 if (!isa<Instruction>(V) && !isa<Argument>(V)) return;
2061
2062 // Already exported?
2063 if (FuncInfo.isExportedInst(V)) return;
2064
2065 unsigned Reg = FuncInfo.InitializeRegForValue(V);
2066 CopyValueToVirtualRegister(V, Reg);
2067}
2068
2069bool SelectionDAGBuilder::isExportableFromCurrentBlock(const Value *V,
2070 const BasicBlock *FromBB) {
2071 // The operands of the setcc have to be in this block. We don't know
2072 // how to export them from some other block.
2073 if (const Instruction *VI = dyn_cast<Instruction>(V)) {
2074 // Can export from current BB.
2075 if (VI->getParent() == FromBB)
2076 return true;
2077
2078 // Is already exported, noop.
2079 return FuncInfo.isExportedInst(V);
2080 }
2081
2082 // If this is an argument, we can export it if the BB is the entry block or
2083 // if it is already exported.
2084 if (isa<Argument>(V)) {
2085 if (FromBB->isEntryBlock())
2086 return true;
2087
2088 // Otherwise, can only export this if it is already exported.
2089 return FuncInfo.isExportedInst(V);
2090 }
2091
2092 // Otherwise, constants can always be exported.
2093 return true;
2094}
2095
2096/// Return branch probability calculated by BranchProbabilityInfo for IR blocks.
2097BranchProbability
2098SelectionDAGBuilder::getEdgeProbability(const MachineBasicBlock *Src,
2099 const MachineBasicBlock *Dst) const {
2100 BranchProbabilityInfo *BPI = FuncInfo.BPI;
2101 const BasicBlock *SrcBB = Src->getBasicBlock();
2102 const BasicBlock *DstBB = Dst->getBasicBlock();
2103 if (!BPI) {
2104 // If BPI is not available, set the default probability as 1 / N, where N is
2105 // the number of successors.
2106 auto SuccSize = std::max<uint32_t>(succ_size(SrcBB), 1);
2107 return BranchProbability(1, SuccSize);
2108 }
2109 return BPI->getEdgeProbability(SrcBB, DstBB);
2110}
2111
2112void SelectionDAGBuilder::addSuccessorWithProb(MachineBasicBlock *Src,
2113 MachineBasicBlock *Dst,
2114 BranchProbability Prob) {
2115 if (!FuncInfo.BPI)
2116 Src->addSuccessorWithoutProb(Dst);
2117 else {
2118 if (Prob.isUnknown())
2119 Prob = getEdgeProbability(Src, Dst);
2120 Src->addSuccessor(Dst, Prob);
2121 }
2122}
2123
2124static bool InBlock(const Value *V, const BasicBlock *BB) {
2125 if (const Instruction *I = dyn_cast<Instruction>(V))
2126 return I->getParent() == BB;
2127 return true;
2128}
2129
2130/// EmitBranchForMergedCondition - Helper method for FindMergedConditions.
2131/// This function emits a branch and is used at the leaves of an OR or an
2132/// AND operator tree.
2133void
2134SelectionDAGBuilder::EmitBranchForMergedCondition(const Value *Cond,
2135 MachineBasicBlock *TBB,
2136 MachineBasicBlock *FBB,
2137 MachineBasicBlock *CurBB,
2138 MachineBasicBlock *SwitchBB,
2139 BranchProbability TProb,
2140 BranchProbability FProb,
2141 bool InvertCond) {
2142 const BasicBlock *BB = CurBB->getBasicBlock();
2143
2144 // If the leaf of the tree is a comparison, merge the condition into
2145 // the caseblock.
2146 if (const CmpInst *BOp = dyn_cast<CmpInst>(Cond)) {
2147 // The operands of the cmp have to be in this block. We don't know
2148 // how to export them from some other block. If this is the first block
2149 // of the sequence, no exporting is needed.
2150 if (CurBB == SwitchBB ||
2151 (isExportableFromCurrentBlock(BOp->getOperand(0), BB) &&
2152 isExportableFromCurrentBlock(BOp->getOperand(1), BB))) {
2153 ISD::CondCode Condition;
2154 if (const ICmpInst *IC = dyn_cast<ICmpInst>(Cond)) {
2155 ICmpInst::Predicate Pred =
2156 InvertCond ? IC->getInversePredicate() : IC->getPredicate();
2157 Condition = getICmpCondCode(Pred);
2158 } else {
2159 const FCmpInst *FC = cast<FCmpInst>(Cond);
2160 FCmpInst::Predicate Pred =
2161 InvertCond ? FC->getInversePredicate() : FC->getPredicate();
2162 Condition = getFCmpCondCode(Pred);
2163 if (TM.Options.NoNaNsFPMath)
2164 Condition = getFCmpCodeWithoutNaN(Condition);
2165 }
2166
2167 CaseBlock CB(Condition, BOp->getOperand(0), BOp->getOperand(1), nullptr,
2168 TBB, FBB, CurBB, getCurSDLoc(), TProb, FProb);
2169 SL->SwitchCases.push_back(CB);
2170 return;
2171 }
2172 }
2173
2174 // Create a CaseBlock record representing this branch.
2175 ISD::CondCode Opc = InvertCond ? ISD::SETNE : ISD::SETEQ;
2176 CaseBlock CB(Opc, Cond, ConstantInt::getTrue(*DAG.getContext()),
2177 nullptr, TBB, FBB, CurBB, getCurSDLoc(), TProb, FProb);
2178 SL->SwitchCases.push_back(CB);
2179}
2180
2181void SelectionDAGBuilder::FindMergedConditions(const Value *Cond,
2182 MachineBasicBlock *TBB,
2183 MachineBasicBlock *FBB,
2184 MachineBasicBlock *CurBB,
2185 MachineBasicBlock *SwitchBB,
2186 Instruction::BinaryOps Opc,
2187 BranchProbability TProb,
2188 BranchProbability FProb,
2189 bool InvertCond) {
2190 // Skip over not part of the tree and remember to invert op and operands at
2191 // next level.
2192 Value *NotCond;
2193 if (match(Cond, m_OneUse(m_Not(m_Value(NotCond)))) &&
2194 InBlock(NotCond, CurBB->getBasicBlock())) {
2195 FindMergedConditions(NotCond, TBB, FBB, CurBB, SwitchBB, Opc, TProb, FProb,
2196 !InvertCond);
2197 return;
2198 }
2199
2200 const Instruction *BOp = dyn_cast<Instruction>(Cond);
2201 const Value *BOpOp0, *BOpOp1;
2202 // Compute the effective opcode for Cond, taking into account whether it needs
2203 // to be inverted, e.g.
2204 // and (not (or A, B)), C
2205 // gets lowered as
2206 // and (and (not A, not B), C)
2207 Instruction::BinaryOps BOpc = (Instruction::BinaryOps)0;
2208 if (BOp) {
2209 BOpc = match(BOp, m_LogicalAnd(m_Value(BOpOp0), m_Value(BOpOp1)))
2210 ? Instruction::And
2211 : (match(BOp, m_LogicalOr(m_Value(BOpOp0), m_Value(BOpOp1)))
2212 ? Instruction::Or
2213 : (Instruction::BinaryOps)0);
2214 if (InvertCond) {
2215 if (BOpc == Instruction::And)
2216 BOpc = Instruction::Or;
2217 else if (BOpc == Instruction::Or)
2218 BOpc = Instruction::And;
2219 }
2220 }
2221
2222 // If this node is not part of the or/and tree, emit it as a branch.
2223 // Note that all nodes in the tree should have same opcode.
2224 bool BOpIsInOrAndTree = BOpc && BOpc == Opc && BOp->hasOneUse();
2225 if (!BOpIsInOrAndTree || BOp->getParent() != CurBB->getBasicBlock() ||
2226 !InBlock(BOpOp0, CurBB->getBasicBlock()) ||
2227 !InBlock(BOpOp1, CurBB->getBasicBlock())) {
2228 EmitBranchForMergedCondition(Cond, TBB, FBB, CurBB, SwitchBB,
2229 TProb, FProb, InvertCond);
2230 return;
2231 }
2232
2233 // Create TmpBB after CurBB.
2234 MachineFunction::iterator BBI(CurBB);
2235 MachineFunction &MF = DAG.getMachineFunction();
2236 MachineBasicBlock *TmpBB = MF.CreateMachineBasicBlock(CurBB->getBasicBlock());
2237 CurBB->getParent()->insert(++BBI, TmpBB);
2238
2239 if (Opc == Instruction::Or) {
2240 // Codegen X | Y as:
2241 // BB1:
2242 // jmp_if_X TBB
2243 // jmp TmpBB
2244 // TmpBB:
2245 // jmp_if_Y TBB
2246 // jmp FBB
2247 //
2248
2249 // We have flexibility in setting Prob for BB1 and Prob for TmpBB.
2250 // The requirement is that
2251 // TrueProb for BB1 + (FalseProb for BB1 * TrueProb for TmpBB)
2252 // = TrueProb for original BB.
2253 // Assuming the original probabilities are A and B, one choice is to set
2254 // BB1's probabilities to A/2 and A/2+B, and set TmpBB's probabilities to
2255 // A/(1+B) and 2B/(1+B). This choice assumes that
2256 // TrueProb for BB1 == FalseProb for BB1 * TrueProb for TmpBB.
2257 // Another choice is to assume TrueProb for BB1 equals to TrueProb for
2258 // TmpBB, but the math is more complicated.
2259
2260 auto NewTrueProb = TProb / 2;
2261 auto NewFalseProb = TProb / 2 + FProb;
2262 // Emit the LHS condition.
2263 FindMergedConditions(BOpOp0, TBB, TmpBB, CurBB, SwitchBB, Opc, NewTrueProb,
2264 NewFalseProb, InvertCond);
2265
2266 // Normalize A/2 and B to get A/(1+B) and 2B/(1+B).
2267 SmallVector<BranchProbability, 2> Probs{TProb / 2, FProb};
2268 BranchProbability::normalizeProbabilities(Probs.begin(), Probs.end());
2269 // Emit the RHS condition into TmpBB.
2270 FindMergedConditions(BOpOp1, TBB, FBB, TmpBB, SwitchBB, Opc, Probs[0],
2271 Probs[1], InvertCond);
2272 } else {
2273 assert(Opc == Instruction::And && "Unknown merge op!")((void)0);
2274 // Codegen X & Y as:
2275 // BB1:
2276 // jmp_if_X TmpBB
2277 // jmp FBB
2278 // TmpBB:
2279 // jmp_if_Y TBB
2280 // jmp FBB
2281 //
2282 // This requires creation of TmpBB after CurBB.
2283
2284 // We have flexibility in setting Prob for BB1 and Prob for TmpBB.
2285 // The requirement is that
2286 // FalseProb for BB1 + (TrueProb for BB1 * FalseProb for TmpBB)
2287 // = FalseProb for original BB.
2288 // Assuming the original probabilities are A and B, one choice is to set
2289 // BB1's probabilities to A+B/2 and B/2, and set TmpBB's probabilities to
2290 // 2A/(1+A) and B/(1+A). This choice assumes that FalseProb for BB1 ==
2291 // TrueProb for BB1 * FalseProb for TmpBB.
2292
2293 auto NewTrueProb = TProb + FProb / 2;
2294 auto NewFalseProb = FProb / 2;
2295 // Emit the LHS condition.
2296 FindMergedConditions(BOpOp0, TmpBB, FBB, CurBB, SwitchBB, Opc, NewTrueProb,
2297 NewFalseProb, InvertCond);
2298
2299 // Normalize A and B/2 to get 2A/(1+A) and B/(1+A).
2300 SmallVector<BranchProbability, 2> Probs{TProb, FProb / 2};
2301 BranchProbability::normalizeProbabilities(Probs.begin(), Probs.end());
2302 // Emit the RHS condition into TmpBB.
2303 FindMergedConditions(BOpOp1, TBB, FBB, TmpBB, SwitchBB, Opc, Probs[0],
2304 Probs[1], InvertCond);
2305 }
2306}
2307
2308/// If the set of cases should be emitted as a series of branches, return true.
2309/// If we should emit this as a bunch of and/or'd together conditions, return
2310/// false.
2311bool
2312SelectionDAGBuilder::ShouldEmitAsBranches(const std::vector<CaseBlock> &Cases) {
2313 if (Cases.size() != 2) return true;
2314
2315 // If this is two comparisons of the same values or'd or and'd together, they
2316 // will get folded into a single comparison, so don't emit two blocks.
2317 if ((Cases[0].CmpLHS == Cases[1].CmpLHS &&
2318 Cases[0].CmpRHS == Cases[1].CmpRHS) ||
2319 (Cases[0].CmpRHS == Cases[1].CmpLHS &&
2320 Cases[0].CmpLHS == Cases[1].CmpRHS)) {
2321 return false;
2322 }
2323
2324 // Handle: (X != null) | (Y != null) --> (X|Y) != 0
2325 // Handle: (X == null) & (Y == null) --> (X|Y) == 0
2326 if (Cases[0].CmpRHS == Cases[1].CmpRHS &&
2327 Cases[0].CC == Cases[1].CC &&
2328 isa<Constant>(Cases[0].CmpRHS) &&
2329 cast<Constant>(Cases[0].CmpRHS)->isNullValue()) {
2330 if (Cases[0].CC == ISD::SETEQ && Cases[0].TrueBB == Cases[1].ThisBB)
2331 return false;
2332 if (Cases[0].CC == ISD::SETNE && Cases[0].FalseBB == Cases[1].ThisBB)
2333 return false;
2334 }
2335
2336 return true;
2337}
2338
2339void SelectionDAGBuilder::visitBr(const BranchInst &I) {
2340 MachineBasicBlock *BrMBB = FuncInfo.MBB;
2341
2342 // Update machine-CFG edges.
2343 MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[I.getSuccessor(0)];
2344
2345 if (I.isUnconditional()) {
2346 // Update machine-CFG edges.
2347 BrMBB->addSuccessor(Succ0MBB);
2348
2349 // If this is not a fall-through branch or optimizations are switched off,
2350 // emit the branch.
2351 if (Succ0MBB != NextBlock(BrMBB) || TM.getOptLevel() == CodeGenOpt::None)
2352 DAG.setRoot(DAG.getNode(ISD::BR, getCurSDLoc(),
2353 MVT::Other, getControlRoot(),
2354 DAG.getBasicBlock(Succ0MBB)));
2355
2356 return;
2357 }
2358
2359 // If this condition is one of the special cases we handle, do special stuff
2360 // now.
2361 const Value *CondVal = I.getCondition();
2362 MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)];
2363
2364 // If this is a series of conditions that are or'd or and'd together, emit
2365 // this as a sequence of branches instead of setcc's with and/or operations.
2366 // As long as jumps are not expensive (exceptions for multi-use logic ops,
2367 // unpredictable branches, and vector extracts because those jumps are likely
2368 // expensive for any target), this should improve performance.
2369 // For example, instead of something like:
2370 // cmp A, B
2371 // C = seteq
2372 // cmp D, E
2373 // F = setle
2374 // or C, F
2375 // jnz foo
2376 // Emit:
2377 // cmp A, B
2378 // je foo
2379 // cmp D, E
2380 // jle foo
2381 const Instruction *BOp = dyn_cast<Instruction>(CondVal);
2382 if (!DAG.getTargetLoweringInfo().isJumpExpensive() && BOp &&
2383 BOp->hasOneUse() && !I.hasMetadata(LLVMContext::MD_unpredictable)) {
2384 Value *Vec;
2385 const Value *BOp0, *BOp1;
2386 Instruction::BinaryOps Opcode = (Instruction::BinaryOps)0;
2387 if (match(BOp, m_LogicalAnd(m_Value(BOp0), m_Value(BOp1))))
2388 Opcode = Instruction::And;
2389 else if (match(BOp, m_LogicalOr(m_Value(BOp0), m_Value(BOp1))))
2390 Opcode = Instruction::Or;
2391
2392 if (Opcode && !(match(BOp0, m_ExtractElt(m_Value(Vec), m_Value())) &&
2393 match(BOp1, m_ExtractElt(m_Specific(Vec), m_Value())))) {
2394 FindMergedConditions(BOp, Succ0MBB, Succ1MBB, BrMBB, BrMBB, Opcode,
2395 getEdgeProbability(BrMBB, Succ0MBB),
2396 getEdgeProbability(BrMBB, Succ1MBB),
2397 /*InvertCond=*/false);
2398 // If the compares in later blocks need to use values not currently
2399 // exported from this block, export them now. This block should always
2400 // be the first entry.
2401 assert(SL->SwitchCases[0].ThisBB == BrMBB && "Unexpected lowering!")((void)0);
2402
2403 // Allow some cases to be rejected.
2404 if (ShouldEmitAsBranches(SL->SwitchCases)) {
2405 for (unsigned i = 1, e = SL->SwitchCases.size(); i != e; ++i) {
2406 ExportFromCurrentBlock(SL->SwitchCases[i].CmpLHS);
2407 ExportFromCurrentBlock(SL->SwitchCases[i].CmpRHS);
2408 }
2409
2410 // Emit the branch for this block.
2411 visitSwitchCase(SL->SwitchCases[0], BrMBB);
2412 SL->SwitchCases.erase(SL->SwitchCases.begin());
2413 return;
2414 }
2415
2416 // Okay, we decided not to do this, remove any inserted MBB's and clear
2417 // SwitchCases.
2418 for (unsigned i = 1, e = SL->SwitchCases.size(); i != e; ++i)
2419 FuncInfo.MF->erase(SL->SwitchCases[i].ThisBB);
2420
2421 SL->SwitchCases.clear();
2422 }
2423 }
2424
2425 // Create a CaseBlock record representing this branch.
2426 CaseBlock CB(ISD::SETEQ, CondVal, ConstantInt::getTrue(*DAG.getContext()),
2427 nullptr, Succ0MBB, Succ1MBB, BrMBB, getCurSDLoc());
2428
2429 // Use visitSwitchCase to actually insert the fast branch sequence for this
2430 // cond branch.
2431 visitSwitchCase(CB, BrMBB);
2432}
2433
2434/// visitSwitchCase - Emits the necessary code to represent a single node in
2435/// the binary search tree resulting from lowering a switch instruction.
2436void SelectionDAGBuilder::visitSwitchCase(CaseBlock &CB,
2437 MachineBasicBlock *SwitchBB) {
2438 SDValue Cond;
2439 SDValue CondLHS = getValue(CB.CmpLHS);
2440 SDLoc dl = CB.DL;
2441
2442 if (CB.CC == ISD::SETTRUE) {
2443 // Branch or fall through to TrueBB.
2444 addSuccessorWithProb(SwitchBB, CB.TrueBB, CB.TrueProb);
2445 SwitchBB->normalizeSuccProbs();
2446 if (CB.TrueBB != NextBlock(SwitchBB)) {
2447 DAG.setRoot(DAG.getNode(ISD::BR, dl, MVT::Other, getControlRoot(),
2448 DAG.getBasicBlock(CB.TrueBB)));
2449 }
2450 return;
2451 }
2452
2453 auto &TLI = DAG.getTargetLoweringInfo();
2454 EVT MemVT = TLI.getMemValueType(DAG.getDataLayout(), CB.CmpLHS->getType());
2455
2456 // Build the setcc now.
2457 if (!CB.CmpMHS) {
2458 // Fold "(X == true)" to X and "(X == false)" to !X to
2459 // handle common cases produced by branch lowering.
2460 if (CB.CmpRHS == ConstantInt::getTrue(*DAG.getContext()) &&
2461 CB.CC == ISD::SETEQ)
2462 Cond = CondLHS;
2463 else if (CB.CmpRHS == ConstantInt::getFalse(*DAG.getContext()) &&
2464 CB.CC == ISD::SETEQ) {
2465 SDValue True = DAG.getConstant(1, dl, CondLHS.getValueType());
2466 Cond = DAG.getNode(ISD::XOR, dl, CondLHS.getValueType(), CondLHS, True);
2467 } else {
2468 SDValue CondRHS = getValue(CB.CmpRHS);
2469
2470 // If a pointer's DAG type is larger than its memory type then the DAG
2471 // values are zero-extended. This breaks signed comparisons so truncate
2472 // back to the underlying type before doing the compare.
2473 if (CondLHS.getValueType() != MemVT) {
2474 CondLHS = DAG.getPtrExtOrTrunc(CondLHS, getCurSDLoc(), MemVT);
2475 CondRHS = DAG.getPtrExtOrTrunc(CondRHS, getCurSDLoc(), MemVT);
2476 }
2477 Cond = DAG.getSetCC(dl, MVT::i1, CondLHS, CondRHS, CB.CC);
2478 }
2479 } else {
2480 assert(CB.CC == ISD::SETLE && "Can handle only LE ranges now")((void)0);
2481
2482 const APInt& Low = cast<ConstantInt>(CB.CmpLHS)->getValue();
2483 const APInt& High = cast<ConstantInt>(CB.CmpRHS)->getValue();
2484
2485 SDValue CmpOp = getValue(CB.CmpMHS);
2486 EVT VT = CmpOp.getValueType();
2487
2488 if (cast<ConstantInt>(CB.CmpLHS)->isMinValue(true)) {
2489 Cond = DAG.getSetCC(dl, MVT::i1, CmpOp, DAG.getConstant(High, dl, VT),
2490 ISD::SETLE);
2491 } else {
2492 SDValue SUB = DAG.getNode(ISD::SUB, dl,
2493 VT, CmpOp, DAG.getConstant(Low, dl, VT));
2494 Cond = DAG.getSetCC(dl, MVT::i1, SUB,
2495 DAG.getConstant(High-Low, dl, VT), ISD::SETULE);
2496 }
2497 }
2498
2499 // Update successor info
2500 addSuccessorWithProb(SwitchBB, CB.TrueBB, CB.TrueProb);
2501 // TrueBB and FalseBB are always different unless the incoming IR is
2502 // degenerate. This only happens when running llc on weird IR.
2503 if (CB.TrueBB != CB.FalseBB)
2504 addSuccessorWithProb(SwitchBB, CB.FalseBB, CB.FalseProb);
2505 SwitchBB->normalizeSuccProbs();
2506
2507 // If the lhs block is the next block, invert the condition so that we can
2508 // fall through to the lhs instead of the rhs block.
2509 if (CB.TrueBB == NextBlock(SwitchBB)) {
2510 std::swap(CB.TrueBB, CB.FalseBB);
2511 SDValue True = DAG.getConstant(1, dl, Cond.getValueType());
2512 Cond = DAG.getNode(ISD::XOR, dl, Cond.getValueType(), Cond, True);
2513 }
2514
2515 SDValue BrCond = DAG.getNode(ISD::BRCOND, dl,
2516 MVT::Other, getControlRoot(), Cond,
2517 DAG.getBasicBlock(CB.TrueBB));
2518
2519 // Insert the false branch. Do this even if it's a fall through branch,
2520 // this makes it easier to do DAG optimizations which require inverting
2521 // the branch condition.
2522 BrCond = DAG.getNode(ISD::BR, dl, MVT::Other, BrCond,
2523 DAG.getBasicBlock(CB.FalseBB));
2524
2525 DAG.setRoot(BrCond);
2526}
2527
2528/// visitJumpTable - Emit JumpTable node in the current MBB
2529void SelectionDAGBuilder::visitJumpTable(SwitchCG::JumpTable &JT) {
2530 // Emit the code for the jump table
2531 assert(JT.Reg != -1U && "Should lower JT Header first!")((void)0);
2532 EVT PTy = DAG.getTargetLoweringInfo().getPointerTy(DAG.getDataLayout());
2533 SDValue Index = DAG.getCopyFromReg(getControlRoot(), getCurSDLoc(),
2534 JT.Reg, PTy);
2535 SDValue Table = DAG.getJumpTable(JT.JTI, PTy);
2536 SDValue BrJumpTable = DAG.getNode(ISD::BR_JT, getCurSDLoc(),
2537 MVT::Other, Index.getValue(1),
2538 Table, Index);
2539 DAG.setRoot(BrJumpTable);
2540}
2541
2542/// visitJumpTableHeader - This function emits necessary code to produce index
2543/// in the JumpTable from switch case.
2544void SelectionDAGBuilder::visitJumpTableHeader(SwitchCG::JumpTable &JT,
2545 JumpTableHeader &JTH,
2546 MachineBasicBlock *SwitchBB) {
2547 SDLoc dl = getCurSDLoc();
2548
2549 // Subtract the lowest switch case value from the value being switched on.
2550 SDValue SwitchOp = getValue(JTH.SValue);
2551 EVT VT = SwitchOp.getValueType();
2552 SDValue Sub = DAG.getNode(ISD::SUB, dl, VT, SwitchOp,
2553 DAG.getConstant(JTH.First, dl, VT));
2554
2555 // The SDNode we just created, which holds the value being switched on minus
2556 // the smallest case value, needs to be copied to a virtual register so it
2557 // can be used as an index into the jump table in a subsequent basic block.
2558 // This value may be smaller or larger than the target's pointer type, and
2559 // therefore require extension or truncating.
2560 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2561 SwitchOp = DAG.getZExtOrTrunc(Sub, dl, TLI.getPointerTy(DAG.getDataLayout()));
2562
2563 unsigned JumpTableReg =
2564 FuncInfo.CreateReg(TLI.getPointerTy(DAG.getDataLayout()));
2565 SDValue CopyTo = DAG.getCopyToReg(getControlRoot(), dl,
2566 JumpTableReg, SwitchOp);
2567 JT.Reg = JumpTableReg;
2568
2569 if (!JTH.OmitRangeCheck) {
2570 // Emit the range check for the jump table, and branch to the default block
2571 // for the switch statement if the value being switched on exceeds the
2572 // largest case in the switch.
2573 SDValue CMP = DAG.getSetCC(
2574 dl, TLI.getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(),
2575 Sub.getValueType()),
2576 Sub, DAG.getConstant(JTH.Last - JTH.First, dl, VT), ISD::SETUGT);
2577
2578 SDValue BrCond = DAG.getNode(ISD::BRCOND, dl,
2579 MVT::Other, CopyTo, CMP,
2580 DAG.getBasicBlock(JT.Default));
2581
2582 // Avoid emitting unnecessary branches to the next block.
2583 if (JT.MBB != NextBlock(SwitchBB))
2584 BrCond = DAG.getNode(ISD::BR, dl, MVT::Other, BrCond,
2585 DAG.getBasicBlock(JT.MBB));
2586
2587 DAG.setRoot(BrCond);
2588 } else {
2589 // Avoid emitting unnecessary branches to the next block.
2590 if (JT.MBB != NextBlock(SwitchBB))
2591 DAG.setRoot(DAG.getNode(ISD::BR, dl, MVT::Other, CopyTo,
2592 DAG.getBasicBlock(JT.MBB)));
2593 else
2594 DAG.setRoot(CopyTo);
2595 }
2596}
2597
2598/// Create a LOAD_STACK_GUARD node, and let it carry the target specific global
2599/// variable if there exists one.
2600static SDValue getLoadStackGuard(SelectionDAG &DAG, const SDLoc &DL,
2601 SDValue &Chain) {
2602 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2603 EVT PtrTy = TLI.getPointerTy(DAG.getDataLayout());
2604 EVT PtrMemTy = TLI.getPointerMemTy(DAG.getDataLayout());
2605 MachineFunction &MF = DAG.getMachineFunction();
2606 Value *Global = TLI.getSDagStackGuard(*MF.getFunction().getParent());
2607 MachineSDNode *Node =
2608 DAG.getMachineNode(TargetOpcode::LOAD_STACK_GUARD, DL, PtrTy, Chain);
2609 if (Global) {
2610 MachinePointerInfo MPInfo(Global);
2611 auto Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOInvariant |
2612 MachineMemOperand::MODereferenceable;
2613 MachineMemOperand *MemRef = MF.getMachineMemOperand(
2614 MPInfo, Flags, PtrTy.getSizeInBits() / 8, DAG.getEVTAlign(PtrTy));
2615 DAG.setNodeMemRefs(Node, {MemRef});
2616 }
2617 if (PtrTy != PtrMemTy)
2618 return DAG.getPtrExtOrTrunc(SDValue(Node, 0), DL, PtrMemTy);
2619 return SDValue(Node, 0);
2620}
2621
2622/// Codegen a new tail for a stack protector check ParentMBB which has had its
2623/// tail spliced into a stack protector check success bb.
2624///
2625/// For a high level explanation of how this fits into the stack protector
2626/// generation see the comment on the declaration of class
2627/// StackProtectorDescriptor.
2628void SelectionDAGBuilder::visitSPDescriptorParent(StackProtectorDescriptor &SPD,
2629 MachineBasicBlock *ParentBB) {
2630
2631 // First create the loads to the guard/stack slot for the comparison.
2632 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2633 EVT PtrTy = TLI.getPointerTy(DAG.getDataLayout());
2634 EVT PtrMemTy = TLI.getPointerMemTy(DAG.getDataLayout());
2635
2636 MachineFrameInfo &MFI = ParentBB->getParent()->getFrameInfo();
2637 int FI = MFI.getStackProtectorIndex();
2638
2639 SDValue Guard;
2640 SDLoc dl = getCurSDLoc();
2641 SDValue StackSlotPtr = DAG.getFrameIndex(FI, PtrTy);
2642 const Module &M = *ParentBB->getParent()->getFunction().getParent();
2643 Align Align = DL->getPrefTypeAlign(Type::getInt8PtrTy(M.getContext()));
2644
2645 // Generate code to load the content of the guard slot.
2646 SDValue GuardVal = DAG.getLoad(
2647 PtrMemTy, dl, DAG.getEntryNode(), StackSlotPtr,
2648 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI), Align,
2649 MachineMemOperand::MOVolatile);
2650
2651 if (TLI.useStackGuardXorFP())
2652 GuardVal = TLI.emitStackGuardXorFP(DAG, GuardVal, dl);
2653
2654 // Retrieve guard check function, nullptr if instrumentation is inlined.
2655 if (const Function *GuardCheckFn = TLI.getSSPStackGuardCheck(M)) {
2656 // The target provides a guard check function to validate the guard value.
2657 // Generate a call to that function with the content of the guard slot as
2658 // argument.
2659 FunctionType *FnTy = GuardCheckFn->getFunctionType();
2660 assert(FnTy->getNumParams() == 1 && "Invalid function signature")((void)0);
2661
2662 TargetLowering::ArgListTy Args;
2663 TargetLowering::ArgListEntry Entry;
2664 Entry.Node = GuardVal;
2665 Entry.Ty = FnTy->getParamType(0);
2666 if (GuardCheckFn->hasAttribute(1, Attribute::AttrKind::InReg))
2667 Entry.IsInReg = true;
2668 Args.push_back(Entry);
2669
2670 TargetLowering::CallLoweringInfo CLI(DAG);
2671 CLI.setDebugLoc(getCurSDLoc())
2672 .setChain(DAG.getEntryNode())
2673 .setCallee(GuardCheckFn->getCallingConv(), FnTy->getReturnType(),
2674 getValue(GuardCheckFn), std::move(Args));
2675
2676 std::pair<SDValue, SDValue> Result = TLI.LowerCallTo(CLI);
2677 DAG.setRoot(Result.second);
2678 return;
2679 }
2680
2681 // If useLoadStackGuardNode returns true, generate LOAD_STACK_GUARD.
2682 // Otherwise, emit a volatile load to retrieve the stack guard value.
2683 SDValue Chain = DAG.getEntryNode();
2684 if (TLI.useLoadStackGuardNode()) {
2685 Guard = getLoadStackGuard(DAG, dl, Chain);
2686 } else {
2687 const Value *IRGuard = TLI.getSDagStackGuard(M);
2688 SDValue GuardPtr = getValue(IRGuard);
2689
2690 Guard = DAG.getLoad(PtrMemTy, dl, Chain, GuardPtr,
2691 MachinePointerInfo(IRGuard, 0), Align,
2692 MachineMemOperand::MOVolatile);
2693 }
2694
2695 // Perform the comparison via a getsetcc.
2696 SDValue Cmp = DAG.getSetCC(dl, TLI.getSetCCResultType(DAG.getDataLayout(),
2697 *DAG.getContext(),
2698 Guard.getValueType()),
2699 Guard, GuardVal, ISD::SETNE);
2700
2701 // If the guard/stackslot do not equal, branch to failure MBB.
2702 SDValue BrCond = DAG.getNode(ISD::BRCOND, dl,
2703 MVT::Other, GuardVal.getOperand(0),
2704 Cmp, DAG.getBasicBlock(SPD.getFailureMBB()));
2705 // Otherwise branch to success MBB.
2706 SDValue Br = DAG.getNode(ISD::BR, dl,
2707 MVT::Other, BrCond,
2708 DAG.getBasicBlock(SPD.getSuccessMBB()));
2709
2710 DAG.setRoot(Br);
2711}
2712
2713/// Codegen the failure basic block for a stack protector check.
2714///
2715/// A failure stack protector machine basic block consists simply of a call to
2716/// __stack_chk_fail().
2717///
2718/// For a high level explanation of how this fits into the stack protector
2719/// generation see the comment on the declaration of class
2720/// StackProtectorDescriptor.
2721void
2722SelectionDAGBuilder::visitSPDescriptorFailure(StackProtectorDescriptor &SPD) {
2723 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2724 TargetLowering::MakeLibCallOptions CallOptions;
2725 CallOptions.setDiscardResult(true);
2726 SDValue Chain =
2727 TLI.makeLibCall(DAG, RTLIB::STACKPROTECTOR_CHECK_FAIL, MVT::isVoid,
2728 None, CallOptions, getCurSDLoc()).second;
2729 // On PS4, the "return address" must still be within the calling function,
2730 // even if it's at the very end, so emit an explicit TRAP here.
2731 // Passing 'true' for doesNotReturn above won't generate the trap for us.
2732 if (TM.getTargetTriple().isPS4CPU())
2733 Chain = DAG.getNode(ISD::TRAP, getCurSDLoc(), MVT::Other, Chain);
2734 // WebAssembly needs an unreachable instruction after a non-returning call,
2735 // because the function return type can be different from __stack_chk_fail's
2736 // return type (void).
2737 if (TM.getTargetTriple().isWasm())
2738 Chain = DAG.getNode(ISD::TRAP, getCurSDLoc(), MVT::Other, Chain);
2739
2740 DAG.setRoot(Chain);
2741}
2742
2743/// visitBitTestHeader - This function emits necessary code to produce value
2744/// suitable for "bit tests"
2745void SelectionDAGBuilder::visitBitTestHeader(BitTestBlock &B,
2746 MachineBasicBlock *SwitchBB) {
2747 SDLoc dl = getCurSDLoc();
2748
2749 // Subtract the minimum value.
2750 SDValue SwitchOp = getValue(B.SValue);
2751 EVT VT = SwitchOp.getValueType();
2752 SDValue RangeSub =
2753 DAG.getNode(ISD::SUB, dl, VT, SwitchOp, DAG.getConstant(B.First, dl, VT));
2754
2755 // Determine the type of the test operands.
2756 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2757 bool UsePtrType = false;
2758 if (!TLI.isTypeLegal(VT)) {
2759 UsePtrType = true;
2760 } else {
2761 for (unsigned i = 0, e = B.Cases.size(); i != e; ++i)
2762 if (!isUIntN(VT.getSizeInBits(), B.Cases[i].Mask)) {
2763 // Switch table case range are encoded into series of masks.
2764 // Just use pointer type, it's guaranteed to fit.
2765 UsePtrType = true;
2766 break;
2767 }
2768 }
2769 SDValue Sub = RangeSub;
2770 if (UsePtrType) {
2771 VT = TLI.getPointerTy(DAG.getDataLayout());
2772 Sub = DAG.getZExtOrTrunc(Sub, dl, VT);
2773 }
2774
2775 B.RegVT = VT.getSimpleVT();
2776 B.Reg = FuncInfo.CreateReg(B.RegVT);
2777 SDValue CopyTo = DAG.getCopyToReg(getControlRoot(), dl, B.Reg, Sub);
2778
2779 MachineBasicBlock* MBB = B.Cases[0].ThisBB;
2780
2781 if (!B.OmitRangeCheck)
2782 addSuccessorWithProb(SwitchBB, B.Default, B.DefaultProb);
2783 addSuccessorWithProb(SwitchBB, MBB, B.Prob);
2784 SwitchBB->normalizeSuccProbs();
2785
2786 SDValue Root = CopyTo;
2787 if (!B.OmitRangeCheck) {
2788 // Conditional branch to the default block.
2789 SDValue RangeCmp = DAG.getSetCC(dl,
2790 TLI.getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(),
2791 RangeSub.getValueType()),
2792 RangeSub, DAG.getConstant(B.Range, dl, RangeSub.getValueType()),
2793 ISD::SETUGT);
2794
2795 Root = DAG.getNode(ISD::BRCOND, dl, MVT::Other, Root, RangeCmp,
2796 DAG.getBasicBlock(B.Default));
2797 }
2798
2799 // Avoid emitting unnecessary branches to the next block.
2800 if (MBB != NextBlock(SwitchBB))
2801 Root = DAG.getNode(ISD::BR, dl, MVT::Other, Root, DAG.getBasicBlock(MBB));
2802
2803 DAG.setRoot(Root);
2804}
2805
2806/// visitBitTestCase - this function produces one "bit test"
2807void SelectionDAGBuilder::visitBitTestCase(BitTestBlock &BB,
2808 MachineBasicBlock* NextMBB,
2809 BranchProbability BranchProbToNext,
2810 unsigned Reg,
2811 BitTestCase &B,
2812 MachineBasicBlock *SwitchBB) {
2813 SDLoc dl = getCurSDLoc();
2814 MVT VT = BB.RegVT;
2815 SDValue ShiftOp = DAG.getCopyFromReg(getControlRoot(), dl, Reg, VT);
2816 SDValue Cmp;
2817 unsigned PopCount = countPopulation(B.Mask);
2818 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2819 if (PopCount == 1) {
2820 // Testing for a single bit; just compare the shift count with what it
2821 // would need to be to shift a 1 bit in that position.
2822 Cmp = DAG.getSetCC(
2823 dl, TLI.getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT),
2824 ShiftOp, DAG.getConstant(countTrailingZeros(B.Mask), dl, VT),
2825 ISD::SETEQ);
2826 } else if (PopCount == BB.Range) {
2827 // There is only one zero bit in the range, test for it directly.
2828 Cmp = DAG.getSetCC(
2829 dl, TLI.getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT),
2830 ShiftOp, DAG.getConstant(countTrailingOnes(B.Mask), dl, VT),
2831 ISD::SETNE);
2832 } else {
2833 // Make desired shift
2834 SDValue SwitchVal = DAG.getNode(ISD::SHL, dl, VT,
2835 DAG.getConstant(1, dl, VT), ShiftOp);
2836
2837 // Emit bit tests and jumps
2838 SDValue AndOp = DAG.getNode(ISD::AND, dl,
2839 VT, SwitchVal, DAG.getConstant(B.Mask, dl, VT));
2840 Cmp = DAG.getSetCC(
2841 dl, TLI.getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT),
2842 AndOp, DAG.getConstant(0, dl, VT), ISD::SETNE);
2843 }
2844
2845 // The branch probability from SwitchBB to B.TargetBB is B.ExtraProb.
2846 addSuccessorWithProb(SwitchBB, B.TargetBB, B.ExtraProb);
2847 // The branch probability from SwitchBB to NextMBB is BranchProbToNext.
2848 addSuccessorWithProb(SwitchBB, NextMBB, BranchProbToNext);
2849 // It is not guaranteed that the sum of B.ExtraProb and BranchProbToNext is
2850 // one as they are relative probabilities (and thus work more like weights),
2851 // and hence we need to normalize them to let the sum of them become one.
2852 SwitchBB->normalizeSuccProbs();
2853
2854 SDValue BrAnd = DAG.getNode(ISD::BRCOND, dl,
2855 MVT::Other, getControlRoot(),
2856 Cmp, DAG.getBasicBlock(B.TargetBB));
2857
2858 // Avoid emitting unnecessary branches to the next block.
2859 if (NextMBB != NextBlock(SwitchBB))
2860 BrAnd = DAG.getNode(ISD::BR, dl, MVT::Other, BrAnd,
2861 DAG.getBasicBlock(NextMBB));
2862
2863 DAG.setRoot(BrAnd);
2864}
2865
2866void SelectionDAGBuilder::visitInvoke(const InvokeInst &I) {
2867 MachineBasicBlock *InvokeMBB = FuncInfo.MBB;
2868
2869 // Retrieve successors. Look through artificial IR level blocks like
2870 // catchswitch for successors.
2871 MachineBasicBlock *Return = FuncInfo.MBBMap[I.getSuccessor(0)];
2872 const BasicBlock *EHPadBB = I.getSuccessor(1);
2873
2874 // Deopt bundles are lowered in LowerCallSiteWithDeoptBundle, and we don't
2875 // have to do anything here to lower funclet bundles.
2876 assert(!I.hasOperandBundlesOtherThan(((void)0)
2877 {LLVMContext::OB_deopt, LLVMContext::OB_gc_transition,((void)0)
2878 LLVMContext::OB_gc_live, LLVMContext::OB_funclet,((void)0)
2879 LLVMContext::OB_cfguardtarget,((void)0)
2880 LLVMContext::OB_clang_arc_attachedcall}) &&((void)0)
2881 "Cannot lower invokes with arbitrary operand bundles yet!")((void)0);
2882
2883 const Value *Callee(I.getCalledOperand());
2884 const Function *Fn = dyn_cast<Function>(Callee);
2885 if (isa<InlineAsm>(Callee))
2886 visitInlineAsm(I, EHPadBB);
2887 else if (Fn && Fn->isIntrinsic()) {
2888 switch (Fn->getIntrinsicID()) {
2889 default:
2890 llvm_unreachable("Cannot invoke this intrinsic")__builtin_unreachable();
2891 case Intrinsic::donothing:
2892 // Ignore invokes to @llvm.donothing: jump directly to the next BB.
2893 case Intrinsic::seh_try_begin:
2894 case Intrinsic::seh_scope_begin:
2895 case Intrinsic::seh_try_end:
2896 case Intrinsic::seh_scope_end:
2897 break;
2898 case Intrinsic::experimental_patchpoint_void:
2899 case Intrinsic::experimental_patchpoint_i64:
2900 visitPatchpoint(I, EHPadBB);
2901 break;
2902 case Intrinsic::experimental_gc_statepoint:
2903 LowerStatepoint(cast<GCStatepointInst>(I), EHPadBB);
2904 break;
2905 case Intrinsic::wasm_rethrow: {
2906 // This is usually done in visitTargetIntrinsic, but this intrinsic is
2907 // special because it can be invoked, so we manually lower it to a DAG
2908 // node here.
2909 SmallVector<SDValue, 8> Ops;
2910 Ops.push_back(getRoot()); // inchain
2911 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2912 Ops.push_back(
2913 DAG.getTargetConstant(Intrinsic::wasm_rethrow, getCurSDLoc(),
2914 TLI.getPointerTy(DAG.getDataLayout())));
2915 SDVTList VTs = DAG.getVTList(ArrayRef<EVT>({MVT::Other})); // outchain
2916 DAG.setRoot(DAG.getNode(ISD::INTRINSIC_VOID, getCurSDLoc(), VTs, Ops));
2917 break;
2918 }
2919 }
2920 } else if (I.countOperandBundlesOfType(LLVMContext::OB_deopt)) {
2921 // Currently we do not lower any intrinsic calls with deopt operand bundles.
2922 // Eventually we will support lowering the @llvm.experimental.deoptimize
2923 // intrinsic, and right now there are no plans to support other intrinsics
2924 // with deopt state.
2925 LowerCallSiteWithDeoptBundle(&I, getValue(Callee), EHPadBB);
2926 } else {
2927 LowerCallTo(I, getValue(Callee), false, false, EHPadBB);
2928 }
2929
2930 // If the value of the invoke is used outside of its defining block, make it
2931 // available as a virtual register.
2932 // We already took care of the exported value for the statepoint instruction
2933 // during call to the LowerStatepoint.
2934 if (!isa<GCStatepointInst>(I)) {
2935 CopyToExportRegsIfNeeded(&I);
2936 }
2937
2938 SmallVector<std::pair<MachineBasicBlock *, BranchProbability>, 1> UnwindDests;
2939 BranchProbabilityInfo *BPI = FuncInfo.BPI;
2940 BranchProbability EHPadBBProb =
2941 BPI ? BPI->getEdgeProbability(InvokeMBB->getBasicBlock(), EHPadBB)
2942 : BranchProbability::getZero();
2943 findUnwindDestinations(FuncInfo, EHPadBB, EHPadBBProb, UnwindDests);
2944
2945 // Update successor info.
2946 addSuccessorWithProb(InvokeMBB, Return);
2947 for (auto &UnwindDest : UnwindDests) {
2948 UnwindDest.first->setIsEHPad();
2949 addSuccessorWithProb(InvokeMBB, UnwindDest.first, UnwindDest.second);
2950 }
2951 InvokeMBB->normalizeSuccProbs();
2952
2953 // Drop into normal successor.
2954 DAG.setRoot(DAG.getNode(ISD::BR, getCurSDLoc(), MVT::Other, getControlRoot(),
2955 DAG.getBasicBlock(Return)));
2956}
2957
2958void SelectionDAGBuilder::visitCallBr(const CallBrInst &I) {
2959 MachineBasicBlock *CallBrMBB = FuncInfo.MBB;
2960
2961 // Deopt bundles are lowered in LowerCallSiteWithDeoptBundle, and we don't
2962 // have to do anything here to lower funclet bundles.
2963 assert(!I.hasOperandBundlesOtherThan(((void)0)
2964 {LLVMContext::OB_deopt, LLVMContext::OB_funclet}) &&((void)0)
2965 "Cannot lower callbrs with arbitrary operand bundles yet!")((void)0);
2966
2967 assert(I.isInlineAsm() && "Only know how to handle inlineasm callbr")((void)0);
2968 visitInlineAsm(I);
2969 CopyToExportRegsIfNeeded(&I);
2970
2971 // Retrieve successors.
2972 MachineBasicBlock *Return = FuncInfo.MBBMap[I.getDefaultDest()];
2973
2974 // Update successor info.
2975 addSuccessorWithProb(CallBrMBB, Return, BranchProbability::getOne());
2976 for (unsigned i = 0, e = I.getNumIndirectDests(); i < e; ++i) {
2977 MachineBasicBlock *Target = FuncInfo.MBBMap[I.getIndirectDest(i)];
2978 addSuccessorWithProb(CallBrMBB, Target, BranchProbability::getZero());
2979 Target->setIsInlineAsmBrIndirectTarget();
2980 }
2981 CallBrMBB->normalizeSuccProbs();
2982
2983 // Drop into default successor.
2984 DAG.setRoot(DAG.getNode(ISD::BR, getCurSDLoc(),
2985 MVT::Other, getControlRoot(),
2986 DAG.getBasicBlock(Return)));
2987}
2988
2989void SelectionDAGBuilder::visitResume(const ResumeInst &RI) {
2990 llvm_unreachable("SelectionDAGBuilder shouldn't visit resume instructions!")__builtin_unreachable();
2991}
2992
2993void SelectionDAGBuilder::visitLandingPad(const LandingPadInst &LP) {
2994 assert(FuncInfo.MBB->isEHPad() &&((void)0)
2995 "Call to landingpad not in landing pad!")((void)0);
2996
2997 // If there aren't registers to copy the values into (e.g., during SjLj
2998 // exceptions), then don't bother to create these DAG nodes.
2999 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3000 const Constant *PersonalityFn = FuncInfo.Fn->getPersonalityFn();
3001 if (TLI.getExceptionPointerRegister(PersonalityFn) == 0 &&
3002 TLI.getExceptionSelectorRegister(PersonalityFn) == 0)
3003 return;
3004
3005 // If landingpad's return type is token type, we don't create DAG nodes
3006 // for its exception pointer and selector value. The extraction of exception
3007 // pointer or selector value from token type landingpads is not currently
3008 // supported.
3009 if (LP.getType()->isTokenTy())
3010 return;
3011
3012 SmallVector<EVT, 2> ValueVTs;
3013 SDLoc dl = getCurSDLoc();
3014 ComputeValueVTs(TLI, DAG.getDataLayout(), LP.getType(), ValueVTs);
3015 assert(ValueVTs.size() == 2 && "Only two-valued landingpads are supported")((void)0);
3016
3017 // Get the two live-in registers as SDValues. The physregs have already been
3018 // copied into virtual registers.
3019 SDValue Ops[2];
3020 if (FuncInfo.ExceptionPointerVirtReg) {
3021 Ops[0] = DAG.getZExtOrTrunc(
3022 DAG.getCopyFromReg(DAG.getEntryNode(), dl,
3023 FuncInfo.ExceptionPointerVirtReg,
3024 TLI.getPointerTy(DAG.getDataLayout())),
3025 dl, ValueVTs[0]);
3026 } else {
3027 Ops[0] = DAG.getConstant(0, dl, TLI.getPointerTy(DAG.getDataLayout()));
3028 }
3029 Ops[1] = DAG.getZExtOrTrunc(
3030 DAG.getCopyFromReg(DAG.getEntryNode(), dl,
3031 FuncInfo.ExceptionSelectorVirtReg,
3032 TLI.getPointerTy(DAG.getDataLayout())),
3033 dl, ValueVTs[1]);
3034
3035 // Merge into one.
3036 SDValue Res = DAG.getNode(ISD::MERGE_VALUES, dl,
3037 DAG.getVTList(ValueVTs), Ops);
3038 setValue(&LP, Res);
3039}
3040
3041void SelectionDAGBuilder::UpdateSplitBlock(MachineBasicBlock *First,
3042 MachineBasicBlock *Last) {
3043 // Update JTCases.
3044 for (unsigned i = 0, e = SL->JTCases.size(); i != e; ++i)
3045 if (SL->JTCases[i].first.HeaderBB == First)
3046 SL->JTCases[i].first.HeaderBB = Last;
3047
3048 // Update BitTestCases.
3049 for (unsigned i = 0, e = SL->BitTestCases.size(); i != e; ++i)
3050 if (SL->BitTestCases[i].Parent == First)
3051 SL->BitTestCases[i].Parent = Last;
3052}
3053
3054void SelectionDAGBuilder::visitIndirectBr(const IndirectBrInst &I) {
3055 MachineBasicBlock *IndirectBrMBB = FuncInfo.MBB;
3056
3057 // Update machine-CFG edges with unique successors.
3058 SmallSet<BasicBlock*, 32> Done;
3059 for (unsigned i = 0, e = I.getNumSuccessors(); i != e; ++i) {
3060 BasicBlock *BB = I.getSuccessor(i);
3061 bool Inserted = Done.insert(BB).second;
3062 if (!Inserted)
3063 continue;
3064
3065 MachineBasicBlock *Succ = FuncInfo.MBBMap[BB];
3066 addSuccessorWithProb(IndirectBrMBB, Succ);
3067 }
3068 IndirectBrMBB->normalizeSuccProbs();
3069
3070 DAG.setRoot(DAG.getNode(ISD::BRIND, getCurSDLoc(),
3071 MVT::Other, getControlRoot(),
3072 getValue(I.getAddress())));
3073}
3074
3075void SelectionDAGBuilder::visitUnreachable(const UnreachableInst &I) {
3076 if (!DAG.getTarget().Options.TrapUnreachable)
3077 return;
3078
3079 // We may be able to ignore unreachable behind a noreturn call.
3080 if (DAG.getTarget().Options.NoTrapAfterNoreturn) {
3081 const BasicBlock &BB = *I.getParent();
3082 if (&I != &BB.front()) {
3083 BasicBlock::const_iterator PredI =
3084 std::prev(BasicBlock::const_iterator(&I));
3085 if (const CallInst *Call = dyn_cast<CallInst>(&*PredI)) {
3086 if (Call->doesNotReturn())
3087 return;
3088 }
3089 }
3090 }
3091
3092 DAG.setRoot(DAG.getNode(ISD::TRAP, getCurSDLoc(), MVT::Other, DAG.getRoot()));
3093}
3094
3095void SelectionDAGBuilder::visitUnary(const User &I, unsigned Opcode) {
3096 SDNodeFlags Flags;
3097
3098 SDValue Op = getValue(I.getOperand(0));
3099 SDValue UnNodeValue = DAG.getNode(Opcode, getCurSDLoc(), Op.getValueType(),
3100 Op, Flags);
3101 setValue(&I, UnNodeValue);
3102}
3103
3104void SelectionDAGBuilder::visitBinary(const User &I, unsigned Opcode) {
3105 SDNodeFlags Flags;
3106 if (auto *OFBinOp = dyn_cast<OverflowingBinaryOperator>(&I)) {
3107 Flags.setNoSignedWrap(OFBinOp->hasNoSignedWrap());
3108 Flags.setNoUnsignedWrap(OFBinOp->hasNoUnsignedWrap());
3109 }
3110 if (auto *ExactOp = dyn_cast<PossiblyExactOperator>(&I))
3111 Flags.setExact(ExactOp->isExact());
3112 if (auto *FPOp = dyn_cast<FPMathOperator>(&I))
3113 Flags.copyFMF(*FPOp);
3114
3115 SDValue Op1 = getValue(I.getOperand(0));
3116 SDValue Op2 = getValue(I.getOperand(1));
3117 SDValue BinNodeValue = DAG.getNode(Opcode, getCurSDLoc(), Op1.getValueType(),
3118 Op1, Op2, Flags);
3119 setValue(&I, BinNodeValue);
3120}
3121
3122void SelectionDAGBuilder::visitShift(const User &I, unsigned Opcode) {
3123 SDValue Op1 = getValue(I.getOperand(0));
3124 SDValue Op2 = getValue(I.getOperand(1));
3125
3126 EVT ShiftTy = DAG.getTargetLoweringInfo().getShiftAmountTy(
3127 Op1.getValueType(), DAG.getDataLayout());
3128
3129 // Coerce the shift amount to the right type if we can.
3130 if (!I.getType()->isVectorTy() && Op2.getValueType() != ShiftTy) {
3131 unsigned ShiftSize = ShiftTy.getSizeInBits();
3132 unsigned Op2Size = Op2.getValueSizeInBits();
3133 SDLoc DL = getCurSDLoc();
3134
3135 // If the operand is smaller than the shift count type, promote it.
3136 if (ShiftSize > Op2Size)
3137 Op2 = DAG.getNode(ISD::ZERO_EXTEND, DL, ShiftTy, Op2);
3138
3139 // If the operand is larger than the shift count type but the shift
3140 // count type has enough bits to represent any shift value, truncate
3141 // it now. This is a common case and it exposes the truncate to
3142 // optimization early.
3143 else if (ShiftSize >= Log2_32_Ceil(Op2.getValueSizeInBits()))
3144 Op2 = DAG.getNode(ISD::TRUNCATE, DL, ShiftTy, Op2);
3145 // Otherwise we'll need to temporarily settle for some other convenient
3146 // type. Type legalization will make adjustments once the shiftee is split.
3147 else
3148 Op2 = DAG.getZExtOrTrunc(Op2, DL, MVT::i32);
3149 }
3150
3151 bool nuw = false;
3152 bool nsw = false;
3153 bool exact = false;
3154
3155 if (Opcode == ISD::SRL || Opcode == ISD::SRA || Opcode == ISD::SHL) {
3156
3157 if (const OverflowingBinaryOperator *OFBinOp =
3158 dyn_cast<const OverflowingBinaryOperator>(&I)) {
3159 nuw = OFBinOp->hasNoUnsignedWrap();
3160 nsw = OFBinOp->hasNoSignedWrap();
3161 }
3162 if (const PossiblyExactOperator *ExactOp =
3163 dyn_cast<const PossiblyExactOperator>(&I))
3164 exact = ExactOp->isExact();
3165 }
3166 SDNodeFlags Flags;
3167 Flags.setExact(exact);
3168 Flags.setNoSignedWrap(nsw);
3169 Flags.setNoUnsignedWrap(nuw);
3170 SDValue Res = DAG.getNode(Opcode, getCurSDLoc(), Op1.getValueType(), Op1, Op2,
3171 Flags);
3172 setValue(&I, Res);
3173}
3174
3175void SelectionDAGBuilder::visitSDiv(const User &I) {
3176 SDValue Op1 = getValue(I.getOperand(0));
3177 SDValue Op2 = getValue(I.getOperand(1));
3178
3179 SDNodeFlags Flags;
3180 Flags.setExact(isa<PossiblyExactOperator>(&I) &&
3181 cast<PossiblyExactOperator>(&I)->isExact());
3182 setValue(&I, DAG.getNode(ISD::SDIV, getCurSDLoc(), Op1.getValueType(), Op1,
3183 Op2, Flags));
3184}
3185
3186void SelectionDAGBuilder::visitICmp(const User &I) {
3187 ICmpInst::Predicate predicate = ICmpInst::BAD_ICMP_PREDICATE;
3188 if (const ICmpInst *IC = dyn_cast<ICmpInst>(&I))
3189 predicate = IC->getPredicate();
3190 else if (const ConstantExpr *IC = dyn_cast<ConstantExpr>(&I))
3191 predicate = ICmpInst::Predicate(IC->getPredicate());
3192 SDValue Op1 = getValue(I.getOperand(0));
3193 SDValue Op2 = getValue(I.getOperand(1));
3194 ISD::CondCode Opcode = getICmpCondCode(predicate);
3195
3196 auto &TLI = DAG.getTargetLoweringInfo();
3197 EVT MemVT =
3198 TLI.getMemValueType(DAG.getDataLayout(), I.getOperand(0)->getType());
3199
3200 // If a pointer's DAG type is larger than its memory type then the DAG values
3201 // are zero-extended. This breaks signed comparisons so truncate back to the
3202 // underlying type before doing the compare.
3203 if (Op1.getValueType() != MemVT) {
3204 Op1 = DAG.getPtrExtOrTrunc(Op1, getCurSDLoc(), MemVT);
3205 Op2 = DAG.getPtrExtOrTrunc(Op2, getCurSDLoc(), MemVT);
3206 }
3207
3208 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3209 I.getType());
3210 setValue(&I, DAG.getSetCC(getCurSDLoc(), DestVT, Op1, Op2, Opcode));
3211}
3212
3213void SelectionDAGBuilder::visitFCmp(const User &I) {
3214 FCmpInst::Predicate predicate = FCmpInst::BAD_FCMP_PREDICATE;
3215 if (const FCmpInst *FC = dyn_cast<FCmpInst>(&I))
3216 predicate = FC->getPredicate();
3217 else if (const ConstantExpr *FC = dyn_cast<ConstantExpr>(&I))
3218 predicate = FCmpInst::Predicate(FC->getPredicate());
3219 SDValue Op1 = getValue(I.getOperand(0));
3220 SDValue Op2 = getValue(I.getOperand(1));
3221
3222 ISD::CondCode Condition = getFCmpCondCode(predicate);
3223 auto *FPMO = cast<FPMathOperator>(&I);
3224 if (FPMO->hasNoNaNs() || TM.Options.NoNaNsFPMath)
3225 Condition = getFCmpCodeWithoutNaN(Condition);
3226
3227 SDNodeFlags Flags;
3228 Flags.copyFMF(*FPMO);
3229 SelectionDAG::FlagInserter FlagsInserter(DAG, Flags);
3230
3231 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3232 I.getType());
3233 setValue(&I, DAG.getSetCC(getCurSDLoc(), DestVT, Op1, Op2, Condition));
3234}
3235
3236// Check if the condition of the select has one use or two users that are both
3237// selects with the same condition.
3238static bool hasOnlySelectUsers(const Value *Cond) {
3239 return llvm::all_of(Cond->users(), [](const Value *V) {
3240 return isa<SelectInst>(V);
3241 });
3242}
3243
3244void SelectionDAGBuilder::visitSelect(const User &I) {
3245 SmallVector<EVT, 4> ValueVTs;
3246 ComputeValueVTs(DAG.getTargetLoweringInfo(), DAG.getDataLayout(), I.getType(),
3247 ValueVTs);
3248 unsigned NumValues = ValueVTs.size();
3249 if (NumValues == 0) return;
3250
3251 SmallVector<SDValue, 4> Values(NumValues);
3252 SDValue Cond = getValue(I.getOperand(0));
3253 SDValue LHSVal = getValue(I.getOperand(1));
3254 SDValue RHSVal = getValue(I.getOperand(2));
3255 SmallVector<SDValue, 1> BaseOps(1, Cond);
3256 ISD::NodeType OpCode =
3257 Cond.getValueType().isVector() ? ISD::VSELECT : ISD::SELECT;
3258
3259 bool IsUnaryAbs = false;
3260 bool Negate = false;
3261
3262 SDNodeFlags Flags;
3263 if (auto *FPOp = dyn_cast<FPMathOperator>(&I))
3264 Flags.copyFMF(*FPOp);
3265
3266 // Min/max matching is only viable if all output VTs are the same.
3267 if (is_splat(ValueVTs)) {
3268 EVT VT = ValueVTs[0];
3269 LLVMContext &Ctx = *DAG.getContext();
3270 auto &TLI = DAG.getTargetLoweringInfo();
3271
3272 // We care about the legality of the operation after it has been type
3273 // legalized.
3274 while (TLI.getTypeAction(Ctx, VT) != TargetLoweringBase::TypeLegal)
3275 VT = TLI.getTypeToTransformTo(Ctx, VT);
3276
3277 // If the vselect is legal, assume we want to leave this as a vector setcc +
3278 // vselect. Otherwise, if this is going to be scalarized, we want to see if
3279 // min/max is legal on the scalar type.
3280 bool UseScalarMinMax = VT.isVector() &&
3281 !TLI.isOperationLegalOrCustom(ISD::VSELECT, VT);
3282
3283 Value *LHS, *RHS;
3284 auto SPR = matchSelectPattern(const_cast<User*>(&I), LHS, RHS);
3285 ISD::NodeType Opc = ISD::DELETED_NODE;
3286 switch (SPR.Flavor) {
3287 case SPF_UMAX: Opc = ISD::UMAX; break;
3288 case SPF_UMIN: Opc = ISD::UMIN; break;
3289 case SPF_SMAX: Opc = ISD::SMAX; break;
3290 case SPF_SMIN: Opc = ISD::SMIN; break;
3291 case SPF_FMINNUM:
3292 switch (SPR.NaNBehavior) {
3293 case SPNB_NA: llvm_unreachable("No NaN behavior for FP op?")__builtin_unreachable();
3294 case SPNB_RETURNS_NAN: Opc = ISD::FMINIMUM; break;
3295 case SPNB_RETURNS_OTHER: Opc = ISD::FMINNUM; break;
3296 case SPNB_RETURNS_ANY: {
3297 if (TLI.isOperationLegalOrCustom(ISD::FMINNUM, VT))
3298 Opc = ISD::FMINNUM;
3299 else if (TLI.isOperationLegalOrCustom(ISD::FMINIMUM, VT))
3300 Opc = ISD::FMINIMUM;
3301 else if (UseScalarMinMax)
3302 Opc = TLI.isOperationLegalOrCustom(ISD::FMINNUM, VT.getScalarType()) ?
3303 ISD::FMINNUM : ISD::FMINIMUM;
3304 break;
3305 }
3306 }
3307 break;
3308 case SPF_FMAXNUM:
3309 switch (SPR.NaNBehavior) {
3310 case SPNB_NA: llvm_unreachable("No NaN behavior for FP op?")__builtin_unreachable();
3311 case SPNB_RETURNS_NAN: Opc = ISD::FMAXIMUM; break;
3312 case SPNB_RETURNS_OTHER: Opc = ISD::FMAXNUM; break;
3313 case SPNB_RETURNS_ANY:
3314
3315 if (TLI.isOperationLegalOrCustom(ISD::FMAXNUM, VT))
3316 Opc = ISD::FMAXNUM;
3317 else if (TLI.isOperationLegalOrCustom(ISD::FMAXIMUM, VT))
3318 Opc = ISD::FMAXIMUM;
3319 else if (UseScalarMinMax)
3320 Opc = TLI.isOperationLegalOrCustom(ISD::FMAXNUM, VT.getScalarType()) ?
3321 ISD::FMAXNUM : ISD::FMAXIMUM;
3322 break;
3323 }
3324 break;
3325 case SPF_NABS:
3326 Negate = true;
3327 LLVM_FALLTHROUGH[[gnu::fallthrough]];
3328 case SPF_ABS:
3329 IsUnaryAbs = true;
3330 Opc = ISD::ABS;
3331 break;
3332 default: break;
3333 }
3334
3335 if (!IsUnaryAbs && Opc != ISD::DELETED_NODE &&
3336 (TLI.isOperationLegalOrCustom(Opc, VT) ||
3337 (UseScalarMinMax &&
3338 TLI.isOperationLegalOrCustom(Opc, VT.getScalarType()))) &&
3339 // If the underlying comparison instruction is used by any other
3340 // instruction, the consumed instructions won't be destroyed, so it is
3341 // not profitable to convert to a min/max.
3342 hasOnlySelectUsers(cast<SelectInst>(I).getCondition())) {
3343 OpCode = Opc;
3344 LHSVal = getValue(LHS);
3345 RHSVal = getValue(RHS);
3346 BaseOps.clear();
3347 }
3348
3349 if (IsUnaryAbs) {
3350 OpCode = Opc;
3351 LHSVal = getValue(LHS);
3352 BaseOps.clear();
3353 }
3354 }
3355
3356 if (IsUnaryAbs) {
3357 for (unsigned i = 0; i != NumValues; ++i) {
3358 SDLoc dl = getCurSDLoc();
3359 EVT VT = LHSVal.getNode()->getValueType(LHSVal.getResNo() + i);
3360 Values[i] =
3361 DAG.getNode(OpCode, dl, VT, LHSVal.getValue(LHSVal.getResNo() + i));
3362 if (Negate)
3363 Values[i] = DAG.getNode(ISD::SUB, dl, VT, DAG.getConstant(0, dl, VT),
3364 Values[i]);
3365 }
3366 } else {
3367 for (unsigned i = 0; i != NumValues; ++i) {
3368 SmallVector<SDValue, 3> Ops(BaseOps.begin(), BaseOps.end());
3369 Ops.push_back(SDValue(LHSVal.getNode(), LHSVal.getResNo() + i));
3370 Ops.push_back(SDValue(RHSVal.getNode(), RHSVal.getResNo() + i));
3371 Values[i] = DAG.getNode(
3372 OpCode, getCurSDLoc(),
3373 LHSVal.getNode()->getValueType(LHSVal.getResNo() + i), Ops, Flags);
3374 }
3375 }
3376
3377 setValue(&I, DAG.getNode(ISD::MERGE_VALUES, getCurSDLoc(),
3378 DAG.getVTList(ValueVTs), Values));
3379}
3380
3381void SelectionDAGBuilder::visitTrunc(const User &I) {
3382 // TruncInst cannot be a no-op cast because sizeof(src) > sizeof(dest).
3383 SDValue N = getValue(I.getOperand(0));
3384 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3385 I.getType());
3386 setValue(&I, DAG.getNode(ISD::TRUNCATE, getCurSDLoc(), DestVT, N));
3387}
3388
3389void SelectionDAGBuilder::visitZExt(const User &I) {
3390 // ZExt cannot be a no-op cast because sizeof(src) < sizeof(dest).
3391 // ZExt also can't be a cast to bool for same reason. So, nothing much to do
3392 SDValue N = getValue(I.getOperand(0));
3393 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3394 I.getType());
3395 setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, getCurSDLoc(), DestVT, N));
3396}
3397
3398void SelectionDAGBuilder::visitSExt(const User &I) {
3399 // SExt cannot be a no-op cast because sizeof(src) < sizeof(dest).
3400 // SExt also can't be a cast to bool for same reason. So, nothing much to do
3401 SDValue N = getValue(I.getOperand(0));
3402 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3403 I.getType());
3404 setValue(&I, DAG.getNode(ISD::SIGN_EXTEND, getCurSDLoc(), DestVT, N));
3405}
3406
3407void SelectionDAGBuilder::visitFPTrunc(const User &I) {
3408 // FPTrunc is never a no-op cast, no need to check
3409 SDValue N = getValue(I.getOperand(0));
3410 SDLoc dl = getCurSDLoc();
3411 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3412 EVT DestVT = TLI.getValueType(DAG.getDataLayout(), I.getType());
3413 setValue(&I, DAG.getNode(ISD::FP_ROUND, dl, DestVT, N,
3414 DAG.getTargetConstant(
3415 0, dl, TLI.getPointerTy(DAG.getDataLayout()))));
3416}
3417
3418void SelectionDAGBuilder::visitFPExt(const User &I) {
3419 // FPExt is never a no-op cast, no need to check
3420 SDValue N = getValue(I.getOperand(0));
3421 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3422 I.getType());
3423 setValue(&I, DAG.getNode(ISD::FP_EXTEND, getCurSDLoc(), DestVT, N));
3424}
3425
3426void SelectionDAGBuilder::visitFPToUI(const User &I) {
3427 // FPToUI is never a no-op cast, no need to check
3428 SDValue N = getValue(I.getOperand(0));
3429 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3430 I.getType());
3431 setValue(&I, DAG.getNode(ISD::FP_TO_UINT, getCurSDLoc(), DestVT, N));
3432}
3433
3434void SelectionDAGBuilder::visitFPToSI(const User &I) {
3435 // FPToSI is never a no-op cast, no need to check
3436 SDValue N = getValue(I.getOperand(0));
3437 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3438 I.getType());
3439 setValue(&I, DAG.getNode(ISD::FP_TO_SINT, getCurSDLoc(), DestVT, N));
3440}
3441
3442void SelectionDAGBuilder::visitUIToFP(const User &I) {
3443 // UIToFP is never a no-op cast, no need to check
3444 SDValue N = getValue(I.getOperand(0));
3445 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3446 I.getType());
3447 setValue(&I, DAG.getNode(ISD::UINT_TO_FP, getCurSDLoc(), DestVT, N));
3448}
3449
3450void SelectionDAGBuilder::visitSIToFP(const User &I) {
3451 // SIToFP is never a no-op cast, no need to check
3452 SDValue N = getValue(I.getOperand(0));
3453 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3454 I.getType());
3455 setValue(&I, DAG.getNode(ISD::SINT_TO_FP, getCurSDLoc(), DestVT, N));
3456}
3457
3458void SelectionDAGBuilder::visitPtrToInt(const User &I) {
3459 // What to do depends on the size of the integer and the size of the pointer.
3460 // We can either truncate, zero extend, or no-op, accordingly.
3461 SDValue N = getValue(I.getOperand(0));
3462 auto &TLI = DAG.getTargetLoweringInfo();
3463 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3464 I.getType());
3465 EVT PtrMemVT =
3466 TLI.getMemValueType(DAG.getDataLayout(), I.getOperand(0)->getType());
3467 N = DAG.getPtrExtOrTrunc(N, getCurSDLoc(), PtrMemVT);
3468 N = DAG.getZExtOrTrunc(N, getCurSDLoc(), DestVT);
3469 setValue(&I, N);
3470}
3471
3472void SelectionDAGBuilder::visitIntToPtr(const User &I) {
3473 // What to do depends on the size of the integer and the size of the pointer.
3474 // We can either truncate, zero extend, or no-op, accordingly.
3475 SDValue N = getValue(I.getOperand(0));
3476 auto &TLI = DAG.getTargetLoweringInfo();
3477 EVT DestVT = TLI.getValueType(DAG.getDataLayout(), I.getType());
3478 EVT PtrMemVT = TLI.getMemValueType(DAG.getDataLayout(), I.getType());
3479 N = DAG.getZExtOrTrunc(N, getCurSDLoc(), PtrMemVT);
3480 N = DAG.getPtrExtOrTrunc(N, getCurSDLoc(), DestVT);
3481 setValue(&I, N);
3482}
3483
3484void SelectionDAGBuilder::visitBitCast(const User &I) {
3485 SDValue N = getValue(I.getOperand(0));
3486 SDLoc dl = getCurSDLoc();
3487 EVT DestVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
3488 I.getType());
3489
3490 // BitCast assures us that source and destination are the same size so this is
3491 // either a BITCAST or a no-op.
3492 if (DestVT != N.getValueType())
3493 setValue(&I, DAG.getNode(ISD::BITCAST, dl,
3494 DestVT, N)); // convert types.
3495 // Check if the original LLVM IR Operand was a ConstantInt, because getValue()
3496 // might fold any kind of constant expression to an integer constant and that
3497 // is not what we are looking for. Only recognize a bitcast of a genuine
3498 // constant integer as an opaque constant.
3499 else if(ConstantInt *C = dyn_cast<ConstantInt>(I.getOperand(0)))
3500 setValue(&I, DAG.getConstant(C->getValue(), dl, DestVT, /*isTarget=*/false,
3501 /*isOpaque*/true));
3502 else
3503 setValue(&I, N); // noop cast.
3504}
3505
3506void SelectionDAGBuilder::visitAddrSpaceCast(const User &I) {
3507 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3508 const Value *SV = I.getOperand(0);
3509 SDValue N = getValue(SV);
3510 EVT DestVT = TLI.getValueType(DAG.getDataLayout(), I.getType());
3511
3512 unsigned SrcAS = SV->getType()->getPointerAddressSpace();
3513 unsigned DestAS = I.getType()->getPointerAddressSpace();
3514
3515 if (!TM.isNoopAddrSpaceCast(SrcAS, DestAS))
3516 N = DAG.getAddrSpaceCast(getCurSDLoc(), DestVT, N, SrcAS, DestAS);
3517
3518 setValue(&I, N);
3519}
3520
3521void SelectionDAGBuilder::visitInsertElement(const User &I) {
3522 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3523 SDValue InVec = getValue(I.getOperand(0));
3524 SDValue InVal = getValue(I.getOperand(1));
3525 SDValue InIdx = DAG.getSExtOrTrunc(getValue(I.getOperand(2)), getCurSDLoc(),
3526 TLI.getVectorIdxTy(DAG.getDataLayout()));
3527 setValue(&I, DAG.getNode(ISD::INSERT_VECTOR_ELT, getCurSDLoc(),
3528 TLI.getValueType(DAG.getDataLayout(), I.getType()),
3529 InVec, InVal, InIdx));
3530}
3531
3532void SelectionDAGBuilder::visitExtractElement(const User &I) {
3533 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3534 SDValue InVec = getValue(I.getOperand(0));
3535 SDValue InIdx = DAG.getSExtOrTrunc(getValue(I.getOperand(1)), getCurSDLoc(),
3536 TLI.getVectorIdxTy(DAG.getDataLayout()));
3537 setValue(&I, DAG.getNode(ISD::EXTRACT_VECTOR_ELT, getCurSDLoc(),
3538 TLI.getValueType(DAG.getDataLayout(), I.getType()),
3539 InVec, InIdx));
3540}
3541
3542void SelectionDAGBuilder::visitShuffleVector(const User &I) {
3543 SDValue Src1 = getValue(I.getOperand(0));
3544 SDValue Src2 = getValue(I.getOperand(1));
3545 ArrayRef<int> Mask;
3546 if (auto *SVI = dyn_cast<ShuffleVectorInst>(&I))
3547 Mask = SVI->getShuffleMask();
3548 else
3549 Mask = cast<ConstantExpr>(I).getShuffleMask();
3550 SDLoc DL = getCurSDLoc();
3551 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3552 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
3553 EVT SrcVT = Src1.getValueType();
3554
3555 if (all_of(Mask, [](int Elem) { return Elem == 0; }) &&
3556 VT.isScalableVector()) {
3557 // Canonical splat form of first element of first input vector.
3558 SDValue FirstElt =
3559 DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, SrcVT.getScalarType(), Src1,
3560 DAG.getVectorIdxConstant(0, DL));
3561 setValue(&I, DAG.getNode(ISD::SPLAT_VECTOR, DL, VT, FirstElt));
3562 return;
3563 }
3564
3565 // For now, we only handle splats for scalable vectors.
3566 // The DAGCombiner will perform a BUILD_VECTOR -> SPLAT_VECTOR transformation
3567 // for targets that support a SPLAT_VECTOR for non-scalable vector types.
3568 assert(!VT.isScalableVector() && "Unsupported scalable vector shuffle")((void)0);
3569
3570 unsigned SrcNumElts = SrcVT.getVectorNumElements();
3571 unsigned MaskNumElts = Mask.size();
3572
3573 if (SrcNumElts == MaskNumElts) {
3574 setValue(&I, DAG.getVectorShuffle(VT, DL, Src1, Src2, Mask));
3575 return;
3576 }
3577
3578 // Normalize the shuffle vector since mask and vector length don't match.
3579 if (SrcNumElts < MaskNumElts) {
3580 // Mask is longer than the source vectors. We can use concatenate vector to
3581 // make the mask and vectors lengths match.
3582
3583 if (MaskNumElts % SrcNumElts == 0) {
3584 // Mask length is a multiple of the source vector length.
3585 // Check if the shuffle is some kind of concatenation of the input
3586 // vectors.
3587 unsigned NumConcat = MaskNumElts / SrcNumElts;
3588 bool IsConcat = true;
3589 SmallVector<int, 8> ConcatSrcs(NumConcat, -1);
3590 for (unsigned i = 0; i != MaskNumElts; ++i) {
3591 int Idx = Mask[i];
3592 if (Idx < 0)
3593 continue;
3594 // Ensure the indices in each SrcVT sized piece are sequential and that
3595 // the same source is used for the whole piece.
3596 if ((Idx % SrcNumElts != (i % SrcNumElts)) ||
3597 (ConcatSrcs[i / SrcNumElts] >= 0 &&
3598 ConcatSrcs[i / SrcNumElts] != (int)(Idx / SrcNumElts))) {
3599 IsConcat = false;
3600 break;
3601 }
3602 // Remember which source this index came from.
3603 ConcatSrcs[i / SrcNumElts] = Idx / SrcNumElts;
3604 }
3605
3606 // The shuffle is concatenating multiple vectors together. Just emit
3607 // a CONCAT_VECTORS operation.
3608 if (IsConcat) {
3609 SmallVector<SDValue, 8> ConcatOps;
3610 for (auto Src : ConcatSrcs) {
3611 if (Src < 0)
3612 ConcatOps.push_back(DAG.getUNDEF(SrcVT));
3613 else if (Src == 0)
3614 ConcatOps.push_back(Src1);
3615 else
3616 ConcatOps.push_back(Src2);
3617 }
3618 setValue(&I, DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, ConcatOps));
3619 return;
3620 }
3621 }
3622
3623 unsigned PaddedMaskNumElts = alignTo(MaskNumElts, SrcNumElts);
3624 unsigned NumConcat = PaddedMaskNumElts / SrcNumElts;
3625 EVT PaddedVT = EVT::getVectorVT(*DAG.getContext(), VT.getScalarType(),
3626 PaddedMaskNumElts);
3627
3628 // Pad both vectors with undefs to make them the same length as the mask.
3629 SDValue UndefVal = DAG.getUNDEF(SrcVT);
3630
3631 SmallVector<SDValue, 8> MOps1(NumConcat, UndefVal);
3632 SmallVector<SDValue, 8> MOps2(NumConcat, UndefVal);
3633 MOps1[0] = Src1;
3634 MOps2[0] = Src2;
3635
3636 Src1 = DAG.getNode(ISD::CONCAT_VECTORS, DL, PaddedVT, MOps1);
3637 Src2 = DAG.getNode(ISD::CONCAT_VECTORS, DL, PaddedVT, MOps2);
3638
3639 // Readjust mask for new input vector length.
3640 SmallVector<int, 8> MappedOps(PaddedMaskNumElts, -1);
3641 for (unsigned i = 0; i != MaskNumElts; ++i) {
3642 int Idx = Mask[i];
3643 if (Idx >= (int)SrcNumElts)
3644 Idx -= SrcNumElts - PaddedMaskNumElts;
3645 MappedOps[i] = Idx;
3646 }
3647
3648 SDValue Result = DAG.getVectorShuffle(PaddedVT, DL, Src1, Src2, MappedOps);
3649
3650 // If the concatenated vector was padded, extract a subvector with the
3651 // correct number of elements.
3652 if (MaskNumElts != PaddedMaskNumElts)
3653 Result = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, Result,
3654 DAG.getVectorIdxConstant(0, DL));
3655
3656 setValue(&I, Result);
3657 return;
3658 }
3659
3660 if (SrcNumElts > MaskNumElts) {
3661 // Analyze the access pattern of the vector to see if we can extract
3662 // two subvectors and do the shuffle.
3663 int StartIdx[2] = { -1, -1 }; // StartIdx to extract from
3664 bool CanExtract = true;
3665 for (int Idx : Mask) {
3666 unsigned Input = 0;
3667 if (Idx < 0)
3668 continue;
3669
3670 if (Idx >= (int)SrcNumElts) {
3671 Input = 1;
3672 Idx -= SrcNumElts;
3673 }
3674
3675 // If all the indices come from the same MaskNumElts sized portion of
3676 // the sources we can use extract. Also make sure the extract wouldn't
3677 // extract past the end of the source.
3678 int NewStartIdx = alignDown(Idx, MaskNumElts);
3679 if (NewStartIdx + MaskNumElts > SrcNumElts ||
3680 (StartIdx[Input] >= 0 && StartIdx[Input] != NewStartIdx))
3681 CanExtract = false;
3682 // Make sure we always update StartIdx as we use it to track if all
3683 // elements are undef.
3684 StartIdx[Input] = NewStartIdx;
3685 }
3686
3687 if (StartIdx[0] < 0 && StartIdx[1] < 0) {
3688 setValue(&I, DAG.getUNDEF(VT)); // Vectors are not used.
3689 return;
3690 }
3691 if (CanExtract) {
3692 // Extract appropriate subvector and generate a vector shuffle
3693 for (unsigned Input = 0; Input < 2; ++Input) {
3694 SDValue &Src = Input == 0 ? Src1 : Src2;
3695 if (StartIdx[Input] < 0)
3696 Src = DAG.getUNDEF(VT);
3697 else {
3698 Src = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, Src,
3699 DAG.getVectorIdxConstant(StartIdx[Input], DL));
3700 }
3701 }
3702
3703 // Calculate new mask.
3704 SmallVector<int, 8> MappedOps(Mask.begin(), Mask.end());
3705 for (int &Idx : MappedOps) {
3706 if (Idx >= (int)SrcNumElts)
3707 Idx -= SrcNumElts + StartIdx[1] - MaskNumElts;
3708 else if (Idx >= 0)
3709 Idx -= StartIdx[0];
3710 }
3711
3712 setValue(&I, DAG.getVectorShuffle(VT, DL, Src1, Src2, MappedOps));
3713 return;
3714 }
3715 }
3716
3717 // We can't use either concat vectors or extract subvectors so fall back to
3718 // replacing the shuffle with extract and build vector.
3719 // to insert and build vector.
3720 EVT EltVT = VT.getVectorElementType();
3721 SmallVector<SDValue,8> Ops;
3722 for (int Idx : Mask) {
3723 SDValue Res;
3724
3725 if (Idx < 0) {
3726 Res = DAG.getUNDEF(EltVT);
3727 } else {
3728 SDValue &Src = Idx < (int)SrcNumElts ? Src1 : Src2;
3729 if (Idx >= (int)SrcNumElts) Idx -= SrcNumElts;
3730
3731 Res = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, EltVT, Src,
3732 DAG.getVectorIdxConstant(Idx, DL));
3733 }
3734
3735 Ops.push_back(Res);
3736 }
3737
3738 setValue(&I, DAG.getBuildVector(VT, DL, Ops));
3739}
3740
3741void SelectionDAGBuilder::visitInsertValue(const User &I) {
3742 ArrayRef<unsigned> Indices;
3743 if (const InsertValueInst *IV = dyn_cast<InsertValueInst>(&I))
3744 Indices = IV->getIndices();
3745 else
3746 Indices = cast<ConstantExpr>(&I)->getIndices();
3747
3748 const Value *Op0 = I.getOperand(0);
3749 const Value *Op1 = I.getOperand(1);
3750 Type *AggTy = I.getType();
3751 Type *ValTy = Op1->getType();
3752 bool IntoUndef = isa<UndefValue>(Op0);
3753 bool FromUndef = isa<UndefValue>(Op1);
3754
3755 unsigned LinearIndex = ComputeLinearIndex(AggTy, Indices);
3756
3757 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3758 SmallVector<EVT, 4> AggValueVTs;
3759 ComputeValueVTs(TLI, DAG.getDataLayout(), AggTy, AggValueVTs);
3760 SmallVector<EVT, 4> ValValueVTs;
3761 ComputeValueVTs(TLI, DAG.getDataLayout(), ValTy, ValValueVTs);
3762
3763 unsigned NumAggValues = AggValueVTs.size();
3764 unsigned NumValValues = ValValueVTs.size();
3765 SmallVector<SDValue, 4> Values(NumAggValues);
3766
3767 // Ignore an insertvalue that produces an empty object
3768 if (!NumAggValues) {
3769 setValue(&I, DAG.getUNDEF(MVT(MVT::Other)));
3770 return;
3771 }
3772
3773 SDValue Agg = getValue(Op0);
3774 unsigned i = 0;
3775 // Copy the beginning value(s) from the original aggregate.
3776 for (; i != LinearIndex; ++i)
3777 Values[i] = IntoUndef ? DAG.getUNDEF(AggValueVTs[i]) :
3778 SDValue(Agg.getNode(), Agg.getResNo() + i);
3779 // Copy values from the inserted value(s).
3780 if (NumValValues) {
3781 SDValue Val = getValue(Op1);
3782 for (; i != LinearIndex + NumValValues; ++i)
3783 Values[i] = FromUndef ? DAG.getUNDEF(AggValueVTs[i]) :
3784 SDValue(Val.getNode(), Val.getResNo() + i - LinearIndex);
3785 }
3786 // Copy remaining value(s) from the original aggregate.
3787 for (; i != NumAggValues; ++i)
3788 Values[i] = IntoUndef ? DAG.getUNDEF(AggValueVTs[i]) :
3789 SDValue(Agg.getNode(), Agg.getResNo() + i);
3790
3791 setValue(&I, DAG.getNode(ISD::MERGE_VALUES, getCurSDLoc(),
3792 DAG.getVTList(AggValueVTs), Values));
3793}
3794
3795void SelectionDAGBuilder::visitExtractValue(const User &I) {
3796 ArrayRef<unsigned> Indices;
3797 if (const ExtractValueInst *EV = dyn_cast<ExtractValueInst>(&I))
3798 Indices = EV->getIndices();
3799 else
3800 Indices = cast<ConstantExpr>(&I)->getIndices();
3801
3802 const Value *Op0 = I.getOperand(0);
3803 Type *AggTy = Op0->getType();
3804 Type *ValTy = I.getType();
3805 bool OutOfUndef = isa<UndefValue>(Op0);
3806
3807 unsigned LinearIndex = ComputeLinearIndex(AggTy, Indices);
3808
3809 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3810 SmallVector<EVT, 4> ValValueVTs;
3811 ComputeValueVTs(TLI, DAG.getDataLayout(), ValTy, ValValueVTs);
3812
3813 unsigned NumValValues = ValValueVTs.size();
3814
3815 // Ignore a extractvalue that produces an empty object
3816 if (!NumValValues) {
3817 setValue(&I, DAG.getUNDEF(MVT(MVT::Other)));
3818 return;
3819 }
3820
3821 SmallVector<SDValue, 4> Values(NumValValues);
3822
3823 SDValue Agg = getValue(Op0);
3824 // Copy out the selected value(s).
3825 for (unsigned i = LinearIndex; i != LinearIndex + NumValValues; ++i)
3826 Values[i - LinearIndex] =
3827 OutOfUndef ?
3828 DAG.getUNDEF(Agg.getNode()->getValueType(Agg.getResNo() + i)) :
3829 SDValue(Agg.getNode(), Agg.getResNo() + i);
3830
3831 setValue(&I, DAG.getNode(ISD::MERGE_VALUES, getCurSDLoc(),
3832 DAG.getVTList(ValValueVTs), Values));
3833}
3834
3835void SelectionDAGBuilder::visitGetElementPtr(const User &I) {
3836 Value *Op0 = I.getOperand(0);
3837 // Note that the pointer operand may be a vector of pointers. Take the scalar
3838 // element which holds a pointer.
3839 unsigned AS = Op0->getType()->getScalarType()->getPointerAddressSpace();
3840 SDValue N = getValue(Op0);
3841 SDLoc dl = getCurSDLoc();
3842 auto &TLI = DAG.getTargetLoweringInfo();
3843
3844 // Normalize Vector GEP - all scalar operands should be converted to the
3845 // splat vector.
3846 bool IsVectorGEP = I.getType()->isVectorTy();
3847 ElementCount VectorElementCount =
3848 IsVectorGEP ? cast<VectorType>(I.getType())->getElementCount()
3849 : ElementCount::getFixed(0);
3850
3851 if (IsVectorGEP && !N.getValueType().isVector()) {
3852 LLVMContext &Context = *DAG.getContext();
3853 EVT VT = EVT::getVectorVT(Context, N.getValueType(), VectorElementCount);
3854 if (VectorElementCount.isScalable())
3855 N = DAG.getSplatVector(VT, dl, N);
3856 else
3857 N = DAG.getSplatBuildVector(VT, dl, N);
3858 }
3859
3860 for (gep_type_iterator GTI = gep_type_begin(&I), E = gep_type_end(&I);
3861 GTI != E; ++GTI) {
3862 const Value *Idx = GTI.getOperand();
3863 if (StructType *StTy = GTI.getStructTypeOrNull()) {
3864 unsigned Field = cast<Constant>(Idx)->getUniqueInteger().getZExtValue();
3865 if (Field) {
3866 // N = N + Offset
3867 uint64_t Offset = DL->getStructLayout(StTy)->getElementOffset(Field);
3868
3869 // In an inbounds GEP with an offset that is nonnegative even when
3870 // interpreted as signed, assume there is no unsigned overflow.
3871 SDNodeFlags Flags;
3872 if (int64_t(Offset) >= 0 && cast<GEPOperator>(I).isInBounds())
3873 Flags.setNoUnsignedWrap(true);
3874
3875 N = DAG.getNode(ISD::ADD, dl, N.getValueType(), N,
3876 DAG.getConstant(Offset, dl, N.getValueType()), Flags);
3877 }
3878 } else {
3879 // IdxSize is the width of the arithmetic according to IR semantics.
3880 // In SelectionDAG, we may prefer to do arithmetic in a wider bitwidth
3881 // (and fix up the result later).
3882 unsigned IdxSize = DAG.getDataLayout().getIndexSizeInBits(AS);
3883 MVT IdxTy = MVT::getIntegerVT(IdxSize);
3884 TypeSize ElementSize = DL->getTypeAllocSize(GTI.getIndexedType());
3885 // We intentionally mask away the high bits here; ElementSize may not
3886 // fit in IdxTy.
3887 APInt ElementMul(IdxSize, ElementSize.getKnownMinSize());
3888 bool ElementScalable = ElementSize.isScalable();
3889
3890 // If this is a scalar constant or a splat vector of constants,
3891 // handle it quickly.
3892 const auto *C = dyn_cast<Constant>(Idx);
3893 if (C && isa<VectorType>(C->getType()))
3894 C = C->getSplatValue();
3895
3896 const auto *CI = dyn_cast_or_null<ConstantInt>(C);
3897 if (CI && CI->isZero())
3898 continue;
3899 if (CI && !ElementScalable) {
3900 APInt Offs = ElementMul * CI->getValue().sextOrTrunc(IdxSize);
3901 LLVMContext &Context = *DAG.getContext();
3902 SDValue OffsVal;
3903 if (IsVectorGEP)
3904 OffsVal = DAG.getConstant(
3905 Offs, dl, EVT::getVectorVT(Context, IdxTy, VectorElementCount));
3906 else
3907 OffsVal = DAG.getConstant(Offs, dl, IdxTy);
3908
3909 // In an inbounds GEP with an offset that is nonnegative even when
3910 // interpreted as signed, assume there is no unsigned overflow.
3911 SDNodeFlags Flags;
3912 if (Offs.isNonNegative() && cast<GEPOperator>(I).isInBounds())
3913 Flags.setNoUnsignedWrap(true);
3914
3915 OffsVal = DAG.getSExtOrTrunc(OffsVal, dl, N.getValueType());
3916
3917 N = DAG.getNode(ISD::ADD, dl, N.getValueType(), N, OffsVal, Flags);
3918 continue;
3919 }
3920
3921 // N = N + Idx * ElementMul;
3922 SDValue IdxN = getValue(Idx);
3923
3924 if (!IdxN.getValueType().isVector() && IsVectorGEP) {
3925 EVT VT = EVT::getVectorVT(*Context, IdxN.getValueType(),
3926 VectorElementCount);
3927 if (VectorElementCount.isScalable())
3928 IdxN = DAG.getSplatVector(VT, dl, IdxN);
3929 else
3930 IdxN = DAG.getSplatBuildVector(VT, dl, IdxN);
3931 }
3932
3933 // If the index is smaller or larger than intptr_t, truncate or extend
3934 // it.
3935 IdxN = DAG.getSExtOrTrunc(IdxN, dl, N.getValueType());
3936
3937 if (ElementScalable) {
3938 EVT VScaleTy = N.getValueType().getScalarType();
3939 SDValue VScale = DAG.getNode(
3940 ISD::VSCALE, dl, VScaleTy,
3941 DAG.getConstant(ElementMul.getZExtValue(), dl, VScaleTy));
3942 if (IsVectorGEP)
3943 VScale = DAG.getSplatVector(N.getValueType(), dl, VScale);
3944 IdxN = DAG.getNode(ISD::MUL, dl, N.getValueType(), IdxN, VScale);
3945 } else {
3946 // If this is a multiply by a power of two, turn it into a shl
3947 // immediately. This is a very common case.
3948 if (ElementMul != 1) {
3949 if (ElementMul.isPowerOf2()) {
3950 unsigned Amt = ElementMul.logBase2();
3951 IdxN = DAG.getNode(ISD::SHL, dl,
3952 N.getValueType(), IdxN,
3953 DAG.getConstant(Amt, dl, IdxN.getValueType()));
3954 } else {
3955 SDValue Scale = DAG.getConstant(ElementMul.getZExtValue(), dl,
3956 IdxN.getValueType());
3957 IdxN = DAG.getNode(ISD::MUL, dl,
3958 N.getValueType(), IdxN, Scale);
3959 }
3960 }
3961 }
3962
3963 N = DAG.getNode(ISD::ADD, dl,
3964 N.getValueType(), N, IdxN);
3965 }
3966 }
3967
3968 MVT PtrTy = TLI.getPointerTy(DAG.getDataLayout(), AS);
3969 MVT PtrMemTy = TLI.getPointerMemTy(DAG.getDataLayout(), AS);
3970 if (IsVectorGEP) {
3971 PtrTy = MVT::getVectorVT(PtrTy, VectorElementCount);
3972 PtrMemTy = MVT::getVectorVT(PtrMemTy, VectorElementCount);
3973 }
3974
3975 if (PtrMemTy != PtrTy && !cast<GEPOperator>(I).isInBounds())
3976 N = DAG.getPtrExtendInReg(N, dl, PtrMemTy);
3977
3978 setValue(&I, N);
3979}
3980
3981void SelectionDAGBuilder::visitAlloca(const AllocaInst &I) {
3982 // If this is a fixed sized alloca in the entry block of the function,
3983 // allocate it statically on the stack.
3984 if (FuncInfo.StaticAllocaMap.count(&I))
3985 return; // getValue will auto-populate this.
3986
3987 SDLoc dl = getCurSDLoc();
3988 Type *Ty = I.getAllocatedType();
3989 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3990 auto &DL = DAG.getDataLayout();
3991 uint64_t TySize = DL.getTypeAllocSize(Ty);
3992 MaybeAlign Alignment = std::max(DL.getPrefTypeAlign(Ty), I.getAlign());
3993
3994 SDValue AllocSize = getValue(I.getArraySize());
3995
3996 EVT IntPtr = TLI.getPointerTy(DAG.getDataLayout(), DL.getAllocaAddrSpace());
3997 if (AllocSize.getValueType() != IntPtr)
3998 AllocSize = DAG.getZExtOrTrunc(AllocSize, dl, IntPtr);
3999
4000 AllocSize = DAG.getNode(ISD::MUL, dl, IntPtr,
4001 AllocSize,
4002 DAG.getConstant(TySize, dl, IntPtr));
4003
4004 // Handle alignment. If the requested alignment is less than or equal to
4005 // the stack alignment, ignore it. If the size is greater than or equal to
4006 // the stack alignment, we note this in the DYNAMIC_STACKALLOC node.
4007 Align StackAlign = DAG.getSubtarget().getFrameLowering()->getStackAlign();
4008 if (*Alignment <= StackAlign)
4009 Alignment = None;
4010
4011 const uint64_t StackAlignMask = StackAlign.value() - 1U;
4012 // Round the size of the allocation up to the stack alignment size
4013 // by add SA-1 to the size. This doesn't overflow because we're computing
4014 // an address inside an alloca.
4015 SDNodeFlags Flags;
4016 Flags.setNoUnsignedWrap(true);
4017 AllocSize = DAG.getNode(ISD::ADD, dl, AllocSize.getValueType(), AllocSize,
4018 DAG.getConstant(StackAlignMask, dl, IntPtr), Flags);
4019
4020 // Mask out the low bits for alignment purposes.
4021 AllocSize = DAG.getNode(ISD::AND, dl, AllocSize.getValueType(), AllocSize,
4022 DAG.getConstant(~StackAlignMask, dl, IntPtr));
4023
4024 SDValue Ops[] = {
4025 getRoot(), AllocSize,
4026 DAG.getConstant(Alignment ? Alignment->value() : 0, dl, IntPtr)};
4027 SDVTList VTs = DAG.getVTList(AllocSize.getValueType(), MVT::Other);
4028 SDValue DSA = DAG.getNode(ISD::DYNAMIC_STACKALLOC, dl, VTs, Ops);
4029 setValue(&I, DSA);
4030 DAG.setRoot(DSA.getValue(1));
4031
4032 assert(FuncInfo.MF->getFrameInfo().hasVarSizedObjects())((void)0);
4033}
4034
4035void SelectionDAGBuilder::visitLoad(const LoadInst &I) {
4036 if (I.isAtomic())
4037 return visitAtomicLoad(I);
4038
4039 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4040 const Value *SV = I.getOperand(0);
4041 if (TLI.supportSwiftError()) {
4042 // Swifterror values can come from either a function parameter with
4043 // swifterror attribute or an alloca with swifterror attribute.
4044 if (const Argument *Arg = dyn_cast<Argument>(SV)) {
4045 if (Arg->hasSwiftErrorAttr())
4046 return visitLoadFromSwiftError(I);
4047 }
4048
4049 if (const AllocaInst *Alloca = dyn_cast<AllocaInst>(SV)) {
4050 if (Alloca->isSwiftError())
4051 return visitLoadFromSwiftError(I);
4052 }
4053 }
4054
4055 SDValue Ptr = getValue(SV);
4056
4057 Type *Ty = I.getType();
4058 Align Alignment = I.getAlign();
4059
4060 AAMDNodes AAInfo;
4061 I.getAAMetadata(AAInfo);
4062 const MDNode *Ranges = I.getMetadata(LLVMContext::MD_range);
4063
4064 SmallVector<EVT, 4> ValueVTs, MemVTs;
4065 SmallVector<uint64_t, 4> Offsets;
4066 ComputeValueVTs(TLI, DAG.getDataLayout(), Ty, ValueVTs, &MemVTs, &Offsets);
4067 unsigned NumValues = ValueVTs.size();
4068 if (NumValues == 0)
4069 return;
4070
4071 bool isVolatile = I.isVolatile();
4072
4073 SDValue Root;
4074 bool ConstantMemory = false;
4075 if (isVolatile)
4076 // Serialize volatile loads with other side effects.
4077 Root = getRoot();
4078 else if (NumValues > MaxParallelChains)
4079 Root = getMemoryRoot();
4080 else if (AA &&
4081 AA->pointsToConstantMemory(MemoryLocation(
4082 SV,
4083 LocationSize::precise(DAG.getDataLayout().getTypeStoreSize(Ty)),
4084 AAInfo))) {
4085 // Do not serialize (non-volatile) loads of constant memory with anything.
4086 Root = DAG.getEntryNode();
4087 ConstantMemory = true;
4088 } else {
4089 // Do not serialize non-volatile loads against each other.
4090 Root = DAG.getRoot();
4091 }
4092
4093 SDLoc dl = getCurSDLoc();
4094
4095 if (isVolatile)
4096 Root = TLI.prepareVolatileOrAtomicLoad(Root, dl, DAG);
4097
4098 // An aggregate load cannot wrap around the address space, so offsets to its
4099 // parts don't wrap either.
4100 SDNodeFlags Flags;
4101 Flags.setNoUnsignedWrap(true);
4102
4103 SmallVector<SDValue, 4> Values(NumValues);
4104 SmallVector<SDValue, 4> Chains(std::min(MaxParallelChains, NumValues));
4105 EVT PtrVT = Ptr.getValueType();
4106
4107 MachineMemOperand::Flags MMOFlags
4108 = TLI.getLoadMemOperandFlags(I, DAG.getDataLayout());
4109
4110 unsigned ChainI = 0;
4111 for (unsigned i = 0; i != NumValues; ++i, ++ChainI) {
4112 // Serializing loads here may result in excessive register pressure, and
4113 // TokenFactor places arbitrary choke points on the scheduler. SD scheduling
4114 // could recover a bit by hoisting nodes upward in the chain by recognizing
4115 // they are side-effect free or do not alias. The optimizer should really
4116 // avoid this case by converting large object/array copies to llvm.memcpy
4117 // (MaxParallelChains should always remain as failsafe).
4118 if (ChainI == MaxParallelChains) {
4119 assert(PendingLoads.empty() && "PendingLoads must be serialized first")((void)0);
4120 SDValue Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
4121 makeArrayRef(Chains.data(), ChainI));
4122 Root = Chain;
4123 ChainI = 0;
4124 }
4125 SDValue A = DAG.getNode(ISD::ADD, dl,
4126 PtrVT, Ptr,
4127 DAG.getConstant(Offsets[i], dl, PtrVT),
4128 Flags);
4129
4130 SDValue L = DAG.getLoad(MemVTs[i], dl, Root, A,
4131 MachinePointerInfo(SV, Offsets[i]), Alignment,
4132 MMOFlags, AAInfo, Ranges);
4133 Chains[ChainI] = L.getValue(1);
4134
4135 if (MemVTs[i] != ValueVTs[i])
4136 L = DAG.getZExtOrTrunc(L, dl, ValueVTs[i]);
4137
4138 Values[i] = L;
4139 }
4140
4141 if (!ConstantMemory) {
4142 SDValue Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
4143 makeArrayRef(Chains.data(), ChainI));
4144 if (isVolatile)
4145 DAG.setRoot(Chain);
4146 else
4147 PendingLoads.push_back(Chain);
4148 }
4149
4150 setValue(&I, DAG.getNode(ISD::MERGE_VALUES, dl,
4151 DAG.getVTList(ValueVTs), Values));
4152}
4153
4154void SelectionDAGBuilder::visitStoreToSwiftError(const StoreInst &I) {
4155 assert(DAG.getTargetLoweringInfo().supportSwiftError() &&((void)0)
4156 "call visitStoreToSwiftError when backend supports swifterror")((void)0);
4157
4158 SmallVector<EVT, 4> ValueVTs;
4159 SmallVector<uint64_t, 4> Offsets;
4160 const Value *SrcV = I.getOperand(0);
4161 ComputeValueVTs(DAG.getTargetLoweringInfo(), DAG.getDataLayout(),
4162 SrcV->getType(), ValueVTs, &Offsets);
4163 assert(ValueVTs.size() == 1 && Offsets[0] == 0 &&((void)0)
4164 "expect a single EVT for swifterror")((void)0);
4165
4166 SDValue Src = getValue(SrcV);
4167 // Create a virtual register, then update the virtual register.
4168 Register VReg =
4169 SwiftError.getOrCreateVRegDefAt(&I, FuncInfo.MBB, I.getPointerOperand());
4170 // Chain, DL, Reg, N or Chain, DL, Reg, N, Glue
4171 // Chain can be getRoot or getControlRoot.
4172 SDValue CopyNode = DAG.getCopyToReg(getRoot(), getCurSDLoc(), VReg,
4173 SDValue(Src.getNode(), Src.getResNo()));
4174 DAG.setRoot(CopyNode);
4175}
4176
4177void SelectionDAGBuilder::visitLoadFromSwiftError(const LoadInst &I) {
4178 assert(DAG.getTargetLoweringInfo().supportSwiftError() &&((void)0)
4179 "call visitLoadFromSwiftError when backend supports swifterror")((void)0);
4180
4181 assert(!I.isVolatile() &&((void)0)
4182 !I.hasMetadata(LLVMContext::MD_nontemporal) &&((void)0)
4183 !I.hasMetadata(LLVMContext::MD_invariant_load) &&((void)0)
4184 "Support volatile, non temporal, invariant for load_from_swift_error")((void)0);
4185
4186 const Value *SV = I.getOperand(0);
4187 Type *Ty = I.getType();
4188 AAMDNodes AAInfo;
4189 I.getAAMetadata(AAInfo);
4190 assert(((void)0)
4191 (!AA ||((void)0)
4192 !AA->pointsToConstantMemory(MemoryLocation(((void)0)
4193 SV, LocationSize::precise(DAG.getDataLayout().getTypeStoreSize(Ty)),((void)0)
4194 AAInfo))) &&((void)0)
4195 "load_from_swift_error should not be constant memory")((void)0);
4196
4197 SmallVector<EVT, 4> ValueVTs;
4198 SmallVector<uint64_t, 4> Offsets;
4199 ComputeValueVTs(DAG.getTargetLoweringInfo(), DAG.getDataLayout(), Ty,
4200 ValueVTs, &Offsets);
4201 assert(ValueVTs.size() == 1 && Offsets[0] == 0 &&((void)0)
4202 "expect a single EVT for swifterror")((void)0);
4203
4204 // Chain, DL, Reg, VT, Glue or Chain, DL, Reg, VT
4205 SDValue L = DAG.getCopyFromReg(
4206 getRoot(), getCurSDLoc(),
4207 SwiftError.getOrCreateVRegUseAt(&I, FuncInfo.MBB, SV), ValueVTs[0]);
4208
4209 setValue(&I, L);
4210}
4211
4212void SelectionDAGBuilder::visitStore(const StoreInst &I) {
4213 if (I.isAtomic())
4214 return visitAtomicStore(I);
4215
4216 const Value *SrcV = I.getOperand(0);
4217 const Value *PtrV = I.getOperand(1);
4218
4219 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4220 if (TLI.supportSwiftError()) {
4221 // Swifterror values can come from either a function parameter with
4222 // swifterror attribute or an alloca with swifterror attribute.
4223 if (const Argument *Arg = dyn_cast<Argument>(PtrV)) {
4224 if (Arg->hasSwiftErrorAttr())
4225 return visitStoreToSwiftError(I);
4226 }
4227
4228 if (const AllocaInst *Alloca = dyn_cast<AllocaInst>(PtrV)) {
4229 if (Alloca->isSwiftError())
4230 return visitStoreToSwiftError(I);
4231 }
4232 }
4233
4234 SmallVector<EVT, 4> ValueVTs, MemVTs;
4235 SmallVector<uint64_t, 4> Offsets;
4236 ComputeValueVTs(DAG.getTargetLoweringInfo(), DAG.getDataLayout(),
4237 SrcV->getType(), ValueVTs, &MemVTs, &Offsets);
4238 unsigned NumValues = ValueVTs.size();
4239 if (NumValues == 0)
4240 return;
4241
4242 // Get the lowered operands. Note that we do this after
4243 // checking if NumResults is zero, because with zero results
4244 // the operands won't have values in the map.
4245 SDValue Src = getValue(SrcV);
4246 SDValue Ptr = getValue(PtrV);
4247
4248 SDValue Root = I.isVolatile() ? getRoot() : getMemoryRoot();
4249 SmallVector<SDValue, 4> Chains(std::min(MaxParallelChains, NumValues));
4250 SDLoc dl = getCurSDLoc();
4251 Align Alignment = I.getAlign();
4252 AAMDNodes AAInfo;
4253 I.getAAMetadata(AAInfo);
4254
4255 auto MMOFlags = TLI.getStoreMemOperandFlags(I, DAG.getDataLayout());
4256
4257 // An aggregate load cannot wrap around the address space, so offsets to its
4258 // parts don't wrap either.
4259 SDNodeFlags Flags;
4260 Flags.setNoUnsignedWrap(true);
4261
4262 unsigned ChainI = 0;
4263 for (unsigned i = 0; i != NumValues; ++i, ++ChainI) {
4264 // See visitLoad comments.
4265 if (ChainI == MaxParallelChains) {
4266 SDValue Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
4267 makeArrayRef(Chains.data(), ChainI));
4268 Root = Chain;
4269 ChainI = 0;
4270 }
4271 SDValue Add =
4272 DAG.getMemBasePlusOffset(Ptr, TypeSize::Fixed(Offsets[i]), dl, Flags);
4273 SDValue Val = SDValue(Src.getNode(), Src.getResNo() + i);
4274 if (MemVTs[i] != ValueVTs[i])
4275 Val = DAG.getPtrExtOrTrunc(Val, dl, MemVTs[i]);
4276 SDValue St =
4277 DAG.getStore(Root, dl, Val, Add, MachinePointerInfo(PtrV, Offsets[i]),
4278 Alignment, MMOFlags, AAInfo);
4279 Chains[ChainI] = St;
4280 }
4281
4282 SDValue StoreNode = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
4283 makeArrayRef(Chains.data(), ChainI));
4284 DAG.setRoot(StoreNode);
4285}
4286
4287void SelectionDAGBuilder::visitMaskedStore(const CallInst &I,
4288 bool IsCompressing) {
4289 SDLoc sdl = getCurSDLoc();
4290
4291 auto getMaskedStoreOps = [&](Value *&Ptr, Value *&Mask, Value *&Src0,
4292 MaybeAlign &Alignment) {
4293 // llvm.masked.store.*(Src0, Ptr, alignment, Mask)
4294 Src0 = I.getArgOperand(0);
4295 Ptr = I.getArgOperand(1);
4296 Alignment = cast<ConstantInt>(I.getArgOperand(2))->getMaybeAlignValue();
4297 Mask = I.getArgOperand(3);
4298 };
4299 auto getCompressingStoreOps = [&](Value *&Ptr, Value *&Mask, Value *&Src0,
4300 MaybeAlign &Alignment) {
4301 // llvm.masked.compressstore.*(Src0, Ptr, Mask)
4302 Src0 = I.getArgOperand(0);
4303 Ptr = I.getArgOperand(1);
4304 Mask = I.getArgOperand(2);
4305 Alignment = None;
4306 };
4307
4308 Value *PtrOperand, *MaskOperand, *Src0Operand;
4309 MaybeAlign Alignment;
4310 if (IsCompressing)
4311 getCompressingStoreOps(PtrOperand, MaskOperand, Src0Operand, Alignment);
4312 else
4313 getMaskedStoreOps(PtrOperand, MaskOperand, Src0Operand, Alignment);
4314
4315 SDValue Ptr = getValue(PtrOperand);
4316 SDValue Src0 = getValue(Src0Operand);
4317 SDValue Mask = getValue(MaskOperand);
4318 SDValue Offset = DAG.getUNDEF(Ptr.getValueType());
4319
4320 EVT VT = Src0.getValueType();
4321 if (!Alignment)
4322 Alignment = DAG.getEVTAlign(VT);
4323
4324 AAMDNodes AAInfo;
4325 I.getAAMetadata(AAInfo);
4326
4327 MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
4328 MachinePointerInfo(PtrOperand), MachineMemOperand::MOStore,
4329 // TODO: Make MachineMemOperands aware of scalable
4330 // vectors.
4331 VT.getStoreSize().getKnownMinSize(), *Alignment, AAInfo);
4332 SDValue StoreNode =
4333 DAG.getMaskedStore(getMemoryRoot(), sdl, Src0, Ptr, Offset, Mask, VT, MMO,
4334 ISD::UNINDEXED, false /* Truncating */, IsCompressing);
4335 DAG.setRoot(StoreNode);
4336 setValue(&I, StoreNode);
4337}
4338
4339// Get a uniform base for the Gather/Scatter intrinsic.
4340// The first argument of the Gather/Scatter intrinsic is a vector of pointers.
4341// We try to represent it as a base pointer + vector of indices.
4342// Usually, the vector of pointers comes from a 'getelementptr' instruction.
4343// The first operand of the GEP may be a single pointer or a vector of pointers
4344// Example:
4345// %gep.ptr = getelementptr i32, <8 x i32*> %vptr, <8 x i32> %ind
4346// or
4347// %gep.ptr = getelementptr i32, i32* %ptr, <8 x i32> %ind
4348// %res = call <8 x i32> @llvm.masked.gather.v8i32(<8 x i32*> %gep.ptr, ..
4349//
4350// When the first GEP operand is a single pointer - it is the uniform base we
4351// are looking for. If first operand of the GEP is a splat vector - we
4352// extract the splat value and use it as a uniform base.
4353// In all other cases the function returns 'false'.
4354static bool getUniformBase(const Value *Ptr, SDValue &Base, SDValue &Index,
4355 ISD::MemIndexType &IndexType, SDValue &Scale,
4356 SelectionDAGBuilder *SDB, const BasicBlock *CurBB) {
4357 SelectionDAG& DAG = SDB->DAG;
4358 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4359 const DataLayout &DL = DAG.getDataLayout();
4360
4361 assert(Ptr->getType()->isVectorTy() && "Uexpected pointer type")((void)0);
4362
4363 // Handle splat constant pointer.
4364 if (auto *C = dyn_cast<Constant>(Ptr)) {
4365 C = C->getSplatValue();
4366 if (!C)
4367 return false;
4368
4369 Base = SDB->getValue(C);
4370
4371 ElementCount NumElts = cast<VectorType>(Ptr->getType())->getElementCount();
4372 EVT VT = EVT::getVectorVT(*DAG.getContext(), TLI.getPointerTy(DL), NumElts);
4373 Index = DAG.getConstant(0, SDB->getCurSDLoc(), VT);
4374 IndexType = ISD::SIGNED_SCALED;
4375 Scale = DAG.getTargetConstant(1, SDB->getCurSDLoc(), TLI.getPointerTy(DL));
4376 return true;
4377 }
4378
4379 const GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr);
4380 if (!GEP || GEP->getParent() != CurBB)
4381 return false;
4382
4383 if (GEP->getNumOperands() != 2)
4384 return false;
4385
4386 const Value *BasePtr = GEP->getPointerOperand();
4387 const Value *IndexVal = GEP->getOperand(GEP->getNumOperands() - 1);
4388
4389 // Make sure the base is scalar and the index is a vector.
4390 if (BasePtr->getType()->isVectorTy() || !IndexVal->getType()->isVectorTy())
4391 return false;
4392
4393 Base = SDB->getValue(BasePtr);
4394 Index = SDB->getValue(IndexVal);
4395 IndexType = ISD::SIGNED_SCALED;
4396 Scale = DAG.getTargetConstant(
4397 DL.getTypeAllocSize(GEP->getResultElementType()),
4398 SDB->getCurSDLoc(), TLI.getPointerTy(DL));
4399 return true;
4400}
4401
4402void SelectionDAGBuilder::visitMaskedScatter(const CallInst &I) {
4403 SDLoc sdl = getCurSDLoc();
4404
4405 // llvm.masked.scatter.*(Src0, Ptrs, alignment, Mask)
4406 const Value *Ptr = I.getArgOperand(1);
4407 SDValue Src0 = getValue(I.getArgOperand(0));
4408 SDValue Mask = getValue(I.getArgOperand(3));
4409 EVT VT = Src0.getValueType();
4410 Align Alignment = cast<ConstantInt>(I.getArgOperand(2))
4411 ->getMaybeAlignValue()
4412 .getValueOr(DAG.getEVTAlign(VT.getScalarType()));
4413 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4414
4415 AAMDNodes AAInfo;
4416 I.getAAMetadata(AAInfo);
4417
4418 SDValue Base;
4419 SDValue Index;
4420 ISD::MemIndexType IndexType;
4421 SDValue Scale;
4422 bool UniformBase = getUniformBase(Ptr, Base, Index, IndexType, Scale, this,
4423 I.getParent());
4424
4425 unsigned AS = Ptr->getType()->getScalarType()->getPointerAddressSpace();
4426 MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
4427 MachinePointerInfo(AS), MachineMemOperand::MOStore,
4428 // TODO: Make MachineMemOperands aware of scalable
4429 // vectors.
4430 MemoryLocation::UnknownSize, Alignment, AAInfo);
4431 if (!UniformBase) {
4432 Base = DAG.getConstant(0, sdl, TLI.getPointerTy(DAG.getDataLayout()));
4433 Index = getValue(Ptr);
4434 IndexType = ISD::SIGNED_UNSCALED;
4435 Scale = DAG.getTargetConstant(1, sdl, TLI.getPointerTy(DAG.getDataLayout()));
4436 }
4437
4438 EVT IdxVT = Index.getValueType();
4439 EVT EltTy = IdxVT.getVectorElementType();
4440 if (TLI.shouldExtendGSIndex(IdxVT, EltTy)) {
4441 EVT NewIdxVT = IdxVT.changeVectorElementType(EltTy);
4442 Index = DAG.getNode(ISD::SIGN_EXTEND, sdl, NewIdxVT, Index);
4443 }
4444
4445 SDValue Ops[] = { getMemoryRoot(), Src0, Mask, Base, Index, Scale };
4446 SDValue Scatter = DAG.getMaskedScatter(DAG.getVTList(MVT::Other), VT, sdl,
4447 Ops, MMO, IndexType, false);
4448 DAG.setRoot(Scatter);
4449 setValue(&I, Scatter);
4450}
4451
4452void SelectionDAGBuilder::visitMaskedLoad(const CallInst &I, bool IsExpanding) {
4453 SDLoc sdl = getCurSDLoc();
4454
4455 auto getMaskedLoadOps = [&](Value *&Ptr, Value *&Mask, Value *&Src0,
4456 MaybeAlign &Alignment) {
4457 // @llvm.masked.load.*(Ptr, alignment, Mask, Src0)
4458 Ptr = I.getArgOperand(0);
4459 Alignment = cast<ConstantInt>(I.getArgOperand(1))->getMaybeAlignValue();
4460 Mask = I.getArgOperand(2);
4461 Src0 = I.getArgOperand(3);
4462 };
4463 auto getExpandingLoadOps = [&](Value *&Ptr, Value *&Mask, Value *&Src0,
4464 MaybeAlign &Alignment) {
4465 // @llvm.masked.expandload.*(Ptr, Mask, Src0)
4466 Ptr = I.getArgOperand(0);
4467 Alignment = None;
4468 Mask = I.getArgOperand(1);
4469 Src0 = I.getArgOperand(2);
4470 };
4471
4472 Value *PtrOperand, *MaskOperand, *Src0Operand;
4473 MaybeAlign Alignment;
4474 if (IsExpanding)
4475 getExpandingLoadOps(PtrOperand, MaskOperand, Src0Operand, Alignment);
4476 else
4477 getMaskedLoadOps(PtrOperand, MaskOperand, Src0Operand, Alignment);
4478
4479 SDValue Ptr = getValue(PtrOperand);
4480 SDValue Src0 = getValue(Src0Operand);
4481 SDValue Mask = getValue(MaskOperand);
4482 SDValue Offset = DAG.getUNDEF(Ptr.getValueType());
4483
4484 EVT VT = Src0.getValueType();
4485 if (!Alignment)
4486 Alignment = DAG.getEVTAlign(VT);
4487
4488 AAMDNodes AAInfo;
4489 I.getAAMetadata(AAInfo);
4490 const MDNode *Ranges = I.getMetadata(LLVMContext::MD_range);
4491
4492 // Do not serialize masked loads of constant memory with anything.
4493 MemoryLocation ML;
4494 if (VT.isScalableVector())
4495 ML = MemoryLocation::getAfter(PtrOperand);
4496 else
4497 ML = MemoryLocation(PtrOperand, LocationSize::precise(
4498 DAG.getDataLayout().getTypeStoreSize(I.getType())),
4499 AAInfo);
4500 bool AddToChain = !AA || !AA->pointsToConstantMemory(ML);
4501
4502 SDValue InChain = AddToChain ? DAG.getRoot() : DAG.getEntryNode();
4503
4504 MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
4505 MachinePointerInfo(PtrOperand), MachineMemOperand::MOLoad,
4506 // TODO: Make MachineMemOperands aware of scalable
4507 // vectors.
4508 VT.getStoreSize().getKnownMinSize(), *Alignment, AAInfo, Ranges);
4509
4510 SDValue Load =
4511 DAG.getMaskedLoad(VT, sdl, InChain, Ptr, Offset, Mask, Src0, VT, MMO,
4512 ISD::UNINDEXED, ISD::NON_EXTLOAD, IsExpanding);
4513 if (AddToChain)
4514 PendingLoads.push_back(Load.getValue(1));
4515 setValue(&I, Load);
4516}
4517
4518void SelectionDAGBuilder::visitMaskedGather(const CallInst &I) {
4519 SDLoc sdl = getCurSDLoc();
4520
4521 // @llvm.masked.gather.*(Ptrs, alignment, Mask, Src0)
4522 const Value *Ptr = I.getArgOperand(0);
4523 SDValue Src0 = getValue(I.getArgOperand(3));
4524 SDValue Mask = getValue(I.getArgOperand(2));
4525
4526 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4527 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
4528 Align Alignment = cast<ConstantInt>(I.getArgOperand(1))
4529 ->getMaybeAlignValue()
4530 .getValueOr(DAG.getEVTAlign(VT.getScalarType()));
4531
4532 AAMDNodes AAInfo;
4533 I.getAAMetadata(AAInfo);
4534 const MDNode *Ranges = I.getMetadata(LLVMContext::MD_range);
4535
4536 SDValue Root = DAG.getRoot();
4537 SDValue Base;
4538 SDValue Index;
4539 ISD::MemIndexType IndexType;
4540 SDValue Scale;
4541 bool UniformBase = getUniformBase(Ptr, Base, Index, IndexType, Scale, this,
4542 I.getParent());
4543 unsigned AS = Ptr->getType()->getScalarType()->getPointerAddressSpace();
4544 MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
4545 MachinePointerInfo(AS), MachineMemOperand::MOLoad,
4546 // TODO: Make MachineMemOperands aware of scalable
4547 // vectors.
4548 MemoryLocation::UnknownSize, Alignment, AAInfo, Ranges);
4549
4550 if (!UniformBase) {
4551 Base = DAG.getConstant(0, sdl, TLI.getPointerTy(DAG.getDataLayout()));
4552 Index = getValue(Ptr);
4553 IndexType = ISD::SIGNED_UNSCALED;
4554 Scale = DAG.getTargetConstant(1, sdl, TLI.getPointerTy(DAG.getDataLayout()));
4555 }
4556
4557 EVT IdxVT = Index.getValueType();
4558 EVT EltTy = IdxVT.getVectorElementType();
4559 if (TLI.shouldExtendGSIndex(IdxVT, EltTy)) {
4560 EVT NewIdxVT = IdxVT.changeVectorElementType(EltTy);
4561 Index = DAG.getNode(ISD::SIGN_EXTEND, sdl, NewIdxVT, Index);
4562 }
4563
4564 SDValue Ops[] = { Root, Src0, Mask, Base, Index, Scale };
4565 SDValue Gather = DAG.getMaskedGather(DAG.getVTList(VT, MVT::Other), VT, sdl,
4566 Ops, MMO, IndexType, ISD::NON_EXTLOAD);
4567
4568 PendingLoads.push_back(Gather.getValue(1));
4569 setValue(&I, Gather);
4570}
4571
4572void SelectionDAGBuilder::visitAtomicCmpXchg(const AtomicCmpXchgInst &I) {
4573 SDLoc dl = getCurSDLoc();
4574 AtomicOrdering SuccessOrdering = I.getSuccessOrdering();
4575 AtomicOrdering FailureOrdering = I.getFailureOrdering();
4576 SyncScope::ID SSID = I.getSyncScopeID();
4577
4578 SDValue InChain = getRoot();
4579
4580 MVT MemVT = getValue(I.getCompareOperand()).getSimpleValueType();
4581 SDVTList VTs = DAG.getVTList(MemVT, MVT::i1, MVT::Other);
4582
4583 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4584 auto Flags = TLI.getAtomicMemOperandFlags(I, DAG.getDataLayout());
4585
4586 MachineFunction &MF = DAG.getMachineFunction();
4587 MachineMemOperand *MMO = MF.getMachineMemOperand(
4588 MachinePointerInfo(I.getPointerOperand()), Flags, MemVT.getStoreSize(),
4589 DAG.getEVTAlign(MemVT), AAMDNodes(), nullptr, SSID, SuccessOrdering,
4590 FailureOrdering);
4591
4592 SDValue L = DAG.getAtomicCmpSwap(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS,
4593 dl, MemVT, VTs, InChain,
4594 getValue(I.getPointerOperand()),
4595 getValue(I.getCompareOperand()),
4596 getValue(I.getNewValOperand()), MMO);
4597
4598 SDValue OutChain = L.getValue(2);
4599
4600 setValue(&I, L);
4601 DAG.setRoot(OutChain);
4602}
4603
4604void SelectionDAGBuilder::visitAtomicRMW(const AtomicRMWInst &I) {
4605 SDLoc dl = getCurSDLoc();
4606 ISD::NodeType NT;
4607 switch (I.getOperation()) {
4608 default: llvm_unreachable("Unknown atomicrmw operation")__builtin_unreachable();
4609 case AtomicRMWInst::Xchg: NT = ISD::ATOMIC_SWAP; break;
4610 case AtomicRMWInst::Add: NT = ISD::ATOMIC_LOAD_ADD; break;
4611 case AtomicRMWInst::Sub: NT = ISD::ATOMIC_LOAD_SUB; break;
4612 case AtomicRMWInst::And: NT = ISD::ATOMIC_LOAD_AND; break;
4613 case AtomicRMWInst::Nand: NT = ISD::ATOMIC_LOAD_NAND; break;
4614 case AtomicRMWInst::Or: NT = ISD::ATOMIC_LOAD_OR; break;
4615 case AtomicRMWInst::Xor: NT = ISD::ATOMIC_LOAD_XOR; break;
4616 case AtomicRMWInst::Max: NT = ISD::ATOMIC_LOAD_MAX; break;
4617 case AtomicRMWInst::Min: NT = ISD::ATOMIC_LOAD_MIN; break;
4618 case AtomicRMWInst::UMax: NT = ISD::ATOMIC_LOAD_UMAX; break;
4619 case AtomicRMWInst::UMin: NT = ISD::ATOMIC_LOAD_UMIN; break;
4620 case AtomicRMWInst::FAdd: NT = ISD::ATOMIC_LOAD_FADD; break;
4621 case AtomicRMWInst::FSub: NT = ISD::ATOMIC_LOAD_FSUB; break;
4622 }
4623 AtomicOrdering Ordering = I.getOrdering();
4624 SyncScope::ID SSID = I.getSyncScopeID();
4625
4626 SDValue InChain = getRoot();
4627
4628 auto MemVT = getValue(I.getValOperand()).getSimpleValueType();
4629 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4630 auto Flags = TLI.getAtomicMemOperandFlags(I, DAG.getDataLayout());
4631
4632 MachineFunction &MF = DAG.getMachineFunction();
4633 MachineMemOperand *MMO = MF.getMachineMemOperand(
4634 MachinePointerInfo(I.getPointerOperand()), Flags, MemVT.getStoreSize(),
4635 DAG.getEVTAlign(MemVT), AAMDNodes(), nullptr, SSID, Ordering);
4636
4637 SDValue L =
4638 DAG.getAtomic(NT, dl, MemVT, InChain,
4639 getValue(I.getPointerOperand()), getValue(I.getValOperand()),
4640 MMO);
4641
4642 SDValue OutChain = L.getValue(1);
4643
4644 setValue(&I, L);
4645 DAG.setRoot(OutChain);
4646}
4647
4648void SelectionDAGBuilder::visitFence(const FenceInst &I) {
4649 SDLoc dl = getCurSDLoc();
4650 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4651 SDValue Ops[3];
4652 Ops[0] = getRoot();
4653 Ops[1] = DAG.getTargetConstant((unsigned)I.getOrdering(), dl,
4654 TLI.getFenceOperandTy(DAG.getDataLayout()));
4655 Ops[2] = DAG.getTargetConstant(I.getSyncScopeID(), dl,
4656 TLI.getFenceOperandTy(DAG.getDataLayout()));
4657 DAG.setRoot(DAG.getNode(ISD::ATOMIC_FENCE, dl, MVT::Other, Ops));
4658}
4659
4660void SelectionDAGBuilder::visitAtomicLoad(const LoadInst &I) {
4661 SDLoc dl = getCurSDLoc();
4662 AtomicOrdering Order = I.getOrdering();
4663 SyncScope::ID SSID = I.getSyncScopeID();
4664
4665 SDValue InChain = getRoot();
4666
4667 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4668 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
4669 EVT MemVT = TLI.getMemValueType(DAG.getDataLayout(), I.getType());
4670
4671 if (!TLI.supportsUnalignedAtomics() &&
4672 I.getAlignment() < MemVT.getSizeInBits() / 8)
4673 report_fatal_error("Cannot generate unaligned atomic load");
4674
4675 auto Flags = TLI.getLoadMemOperandFlags(I, DAG.getDataLayout());
4676
4677 MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
4678 MachinePointerInfo(I.getPointerOperand()), Flags, MemVT.getStoreSize(),
4679 I.getAlign(), AAMDNodes(), nullptr, SSID, Order);
4680
4681 InChain = TLI.prepareVolatileOrAtomicLoad(InChain, dl, DAG);
4682
4683 SDValue Ptr = getValue(I.getPointerOperand());
4684
4685 if (TLI.lowerAtomicLoadAsLoadSDNode(I)) {
4686 // TODO: Once this is better exercised by tests, it should be merged with
4687 // the normal path for loads to prevent future divergence.
4688 SDValue L = DAG.getLoad(MemVT, dl, InChain, Ptr, MMO);
4689 if (MemVT != VT)
4690 L = DAG.getPtrExtOrTrunc(L, dl, VT);
4691
4692 setValue(&I, L);
4693 SDValue OutChain = L.getValue(1);
4694 if (!I.isUnordered())
4695 DAG.setRoot(OutChain);
4696 else
4697 PendingLoads.push_back(OutChain);
4698 return;
4699 }
4700
4701 SDValue L = DAG.getAtomic(ISD::ATOMIC_LOAD, dl, MemVT, MemVT, InChain,
4702 Ptr, MMO);
4703
4704 SDValue OutChain = L.getValue(1);
4705 if (MemVT != VT)
4706 L = DAG.getPtrExtOrTrunc(L, dl, VT);
4707
4708 setValue(&I, L);
4709 DAG.setRoot(OutChain);
4710}
4711
4712void SelectionDAGBuilder::visitAtomicStore(const StoreInst &I) {
4713 SDLoc dl = getCurSDLoc();
4714
4715 AtomicOrdering Ordering = I.getOrdering();
4716 SyncScope::ID SSID = I.getSyncScopeID();
4717
4718 SDValue InChain = getRoot();
4719
4720 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4721 EVT MemVT =
4722 TLI.getMemValueType(DAG.getDataLayout(), I.getValueOperand()->getType());
4723
4724 if (I.getAlignment() < MemVT.getSizeInBits() / 8)
4725 report_fatal_error("Cannot generate unaligned atomic store");
4726
4727 auto Flags = TLI.getStoreMemOperandFlags(I, DAG.getDataLayout());
4728
4729 MachineFunction &MF = DAG.getMachineFunction();
4730 MachineMemOperand *MMO = MF.getMachineMemOperand(
4731 MachinePointerInfo(I.getPointerOperand()), Flags, MemVT.getStoreSize(),
4732 I.getAlign(), AAMDNodes(), nullptr, SSID, Ordering);
4733
4734 SDValue Val = getValue(I.getValueOperand());
4735 if (Val.getValueType() != MemVT)
4736 Val = DAG.getPtrExtOrTrunc(Val, dl, MemVT);
4737 SDValue Ptr = getValue(I.getPointerOperand());
4738
4739 if (TLI.lowerAtomicStoreAsStoreSDNode(I)) {
4740 // TODO: Once this is better exercised by tests, it should be merged with
4741 // the normal path for stores to prevent future divergence.
4742 SDValue S = DAG.getStore(InChain, dl, Val, Ptr, MMO);
4743 DAG.setRoot(S);
4744 return;
4745 }
4746 SDValue OutChain = DAG.getAtomic(ISD::ATOMIC_STORE, dl, MemVT, InChain,
4747 Ptr, Val, MMO);
4748
4749
4750 DAG.setRoot(OutChain);
4751}
4752
4753/// visitTargetIntrinsic - Lower a call of a target intrinsic to an INTRINSIC
4754/// node.
4755void SelectionDAGBuilder::visitTargetIntrinsic(const CallInst &I,
4756 unsigned Intrinsic) {
4757 // Ignore the callsite's attributes. A specific call site may be marked with
4758 // readnone, but the lowering code will expect the chain based on the
4759 // definition.
4760 const Function *F = I.getCalledFunction();
4761 bool HasChain = !F->doesNotAccessMemory();
4762 bool OnlyLoad = HasChain && F->onlyReadsMemory();
4763
4764 // Build the operand list.
4765 SmallVector<SDValue, 8> Ops;
4766 if (HasChain) { // If this intrinsic has side-effects, chainify it.
4767 if (OnlyLoad) {
4768 // We don't need to serialize loads against other loads.
4769 Ops.push_back(DAG.getRoot());
4770 } else {
4771 Ops.push_back(getRoot());
4772 }
4773 }
4774
4775 // Info is set by getTgtMemInstrinsic
4776 TargetLowering::IntrinsicInfo Info;
4777 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4778 bool IsTgtIntrinsic = TLI.getTgtMemIntrinsic(Info, I,
4779 DAG.getMachineFunction(),
4780 Intrinsic);
4781
4782 // Add the intrinsic ID as an integer operand if it's not a target intrinsic.
4783 if (!IsTgtIntrinsic || Info.opc == ISD::INTRINSIC_VOID ||
4784 Info.opc == ISD::INTRINSIC_W_CHAIN)
4785 Ops.push_back(DAG.getTargetConstant(Intrinsic, getCurSDLoc(),
4786 TLI.getPointerTy(DAG.getDataLayout())));
4787
4788 // Add all operands of the call to the operand list.
4789 for (unsigned i = 0, e = I.getNumArgOperands(); i != e; ++i) {
4790 const Value *Arg = I.getArgOperand(i);
4791 if (!I.paramHasAttr(i, Attribute::ImmArg)) {
4792 Ops.push_back(getValue(Arg));
4793 continue;
4794 }
4795
4796 // Use TargetConstant instead of a regular constant for immarg.
4797 EVT VT = TLI.getValueType(*DL, Arg->getType(), true);
4798 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Arg)) {
4799 assert(CI->getBitWidth() <= 64 &&((void)0)
4800 "large intrinsic immediates not handled")((void)0);
4801 Ops.push_back(DAG.getTargetConstant(*CI, SDLoc(), VT));
4802 } else {
4803 Ops.push_back(
4804 DAG.getTargetConstantFP(*cast<ConstantFP>(Arg), SDLoc(), VT));
4805 }
4806 }
4807
4808 SmallVector<EVT, 4> ValueVTs;
4809 ComputeValueVTs(TLI, DAG.getDataLayout(), I.getType(), ValueVTs);
4810
4811 if (HasChain)
4812 ValueVTs.push_back(MVT::Other);
4813
4814 SDVTList VTs = DAG.getVTList(ValueVTs);
4815
4816 // Propagate fast-math-flags from IR to node(s).
4817 SDNodeFlags Flags;
4818 if (auto *FPMO = dyn_cast<FPMathOperator>(&I))
4819 Flags.copyFMF(*FPMO);
4820 SelectionDAG::FlagInserter FlagsInserter(DAG, Flags);
4821
4822 // Create the node.
4823 SDValue Result;
4824 if (IsTgtIntrinsic) {
4825 // This is target intrinsic that touches memory
4826 AAMDNodes AAInfo;
4827 I.getAAMetadata(AAInfo);
4828 Result =
4829 DAG.getMemIntrinsicNode(Info.opc, getCurSDLoc(), VTs, Ops, Info.memVT,
4830 MachinePointerInfo(Info.ptrVal, Info.offset),
4831 Info.align, Info.flags, Info.size, AAInfo);
4832 } else if (!HasChain) {
4833 Result = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, getCurSDLoc(), VTs, Ops);
4834 } else if (!I.getType()->isVoidTy()) {
4835 Result = DAG.getNode(ISD::INTRINSIC_W_CHAIN, getCurSDLoc(), VTs, Ops);
4836 } else {
4837 Result = DAG.getNode(ISD::INTRINSIC_VOID, getCurSDLoc(), VTs, Ops);
4838 }
4839
4840 if (HasChain) {
4841 SDValue Chain = Result.getValue(Result.getNode()->getNumValues()-1);
4842 if (OnlyLoad)
4843 PendingLoads.push_back(Chain);
4844 else
4845 DAG.setRoot(Chain);
4846 }
4847
4848 if (!I.getType()->isVoidTy()) {
4849 if (VectorType *PTy = dyn_cast<VectorType>(I.getType())) {
4850 EVT VT = TLI.getValueType(DAG.getDataLayout(), PTy);
4851 Result = DAG.getNode(ISD::BITCAST, getCurSDLoc(), VT, Result);
4852 } else
4853 Result = lowerRangeToAssertZExt(DAG, I, Result);
4854
4855 MaybeAlign Alignment = I.getRetAlign();
4856 if (!Alignment)
4857 Alignment = F->getAttributes().getRetAlignment();
4858 // Insert `assertalign` node if there's an alignment.
4859 if (InsertAssertAlign && Alignment) {
4860 Result =
4861 DAG.getAssertAlign(getCurSDLoc(), Result, Alignment.valueOrOne());
4862 }
4863
4864 setValue(&I, Result);
4865 }
4866}
4867
4868/// GetSignificand - Get the significand and build it into a floating-point
4869/// number with exponent of 1:
4870///
4871/// Op = (Op & 0x007fffff) | 0x3f800000;
4872///
4873/// where Op is the hexadecimal representation of floating point value.
4874static SDValue GetSignificand(SelectionDAG &DAG, SDValue Op, const SDLoc &dl) {
4875 SDValue t1 = DAG.getNode(ISD::AND, dl, MVT::i32, Op,
4876 DAG.getConstant(0x007fffff, dl, MVT::i32));
4877 SDValue t2 = DAG.getNode(ISD::OR, dl, MVT::i32, t1,
4878 DAG.getConstant(0x3f800000, dl, MVT::i32));
4879 return DAG.getNode(ISD::BITCAST, dl, MVT::f32, t2);
4880}
4881
4882/// GetExponent - Get the exponent:
4883///
4884/// (float)(int)(((Op & 0x7f800000) >> 23) - 127);
4885///
4886/// where Op is the hexadecimal representation of floating point value.
4887static SDValue GetExponent(SelectionDAG &DAG, SDValue Op,
4888 const TargetLowering &TLI, const SDLoc &dl) {
4889 SDValue t0 = DAG.getNode(ISD::AND, dl, MVT::i32, Op,
4890 DAG.getConstant(0x7f800000, dl, MVT::i32));
4891 SDValue t1 = DAG.getNode(
4892 ISD::SRL, dl, MVT::i32, t0,
4893 DAG.getConstant(23, dl, TLI.getPointerTy(DAG.getDataLayout())));
4894 SDValue t2 = DAG.getNode(ISD::SUB, dl, MVT::i32, t1,
4895 DAG.getConstant(127, dl, MVT::i32));
4896 return DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, t2);
4897}
4898
4899/// getF32Constant - Get 32-bit floating point constant.
4900static SDValue getF32Constant(SelectionDAG &DAG, unsigned Flt,
4901 const SDLoc &dl) {
4902 return DAG.getConstantFP(APFloat(APFloat::IEEEsingle(), APInt(32, Flt)), dl,
4903 MVT::f32);
4904}
4905
4906static SDValue getLimitedPrecisionExp2(SDValue t0, const SDLoc &dl,
4907 SelectionDAG &DAG) {
4908 // TODO: What fast-math-flags should be set on the floating-point nodes?
4909
4910 // IntegerPartOfX = ((int32_t)(t0);
4911 SDValue IntegerPartOfX = DAG.getNode(ISD::FP_TO_SINT, dl, MVT::i32, t0);
4912
4913 // FractionalPartOfX = t0 - (float)IntegerPartOfX;
4914 SDValue t1 = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, IntegerPartOfX);
4915 SDValue X = DAG.getNode(ISD::FSUB, dl, MVT::f32, t0, t1);
4916
4917 // IntegerPartOfX <<= 23;
4918 IntegerPartOfX = DAG.getNode(
4919 ISD::SHL, dl, MVT::i32, IntegerPartOfX,
4920 DAG.getConstant(23, dl, DAG.getTargetLoweringInfo().getPointerTy(
4921 DAG.getDataLayout())));
4922
4923 SDValue TwoToFractionalPartOfX;
4924 if (LimitFloatPrecision <= 6) {
4925 // For floating-point precision of 6:
4926 //
4927 // TwoToFractionalPartOfX =
4928 // 0.997535578f +
4929 // (0.735607626f + 0.252464424f * x) * x;
4930 //
4931 // error 0.0144103317, which is 6 bits
4932 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
4933 getF32Constant(DAG, 0x3e814304, dl));
4934 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2,
4935 getF32Constant(DAG, 0x3f3c50c8, dl));
4936 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
4937 TwoToFractionalPartOfX = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
4938 getF32Constant(DAG, 0x3f7f5e7e, dl));
4939 } else if (LimitFloatPrecision <= 12) {
4940 // For floating-point precision of 12:
4941 //
4942 // TwoToFractionalPartOfX =
4943 // 0.999892986f +
4944 // (0.696457318f +
4945 // (0.224338339f + 0.792043434e-1f * x) * x) * x;
4946 //
4947 // error 0.000107046256, which is 13 to 14 bits
4948 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
4949 getF32Constant(DAG, 0x3da235e3, dl));
4950 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2,
4951 getF32Constant(DAG, 0x3e65b8f3, dl));
4952 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
4953 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
4954 getF32Constant(DAG, 0x3f324b07, dl));
4955 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X);
4956 TwoToFractionalPartOfX = DAG.getNode(ISD::FADD, dl, MVT::f32, t6,
4957 getF32Constant(DAG, 0x3f7ff8fd, dl));
4958 } else { // LimitFloatPrecision <= 18
4959 // For floating-point precision of 18:
4960 //
4961 // TwoToFractionalPartOfX =
4962 // 0.999999982f +
4963 // (0.693148872f +
4964 // (0.240227044f +
4965 // (0.554906021e-1f +
4966 // (0.961591928e-2f +
4967 // (0.136028312e-2f + 0.157059148e-3f *x)*x)*x)*x)*x)*x;
4968 // error 2.47208000*10^(-7), which is better than 18 bits
4969 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
4970 getF32Constant(DAG, 0x3924b03e, dl));
4971 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2,
4972 getF32Constant(DAG, 0x3ab24b87, dl));
4973 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
4974 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
4975 getF32Constant(DAG, 0x3c1d8c17, dl));
4976 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X);
4977 SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6,
4978 getF32Constant(DAG, 0x3d634a1d, dl));
4979 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X);
4980 SDValue t9 = DAG.getNode(ISD::FADD, dl, MVT::f32, t8,
4981 getF32Constant(DAG, 0x3e75fe14, dl));
4982 SDValue t10 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t9, X);
4983 SDValue t11 = DAG.getNode(ISD::FADD, dl, MVT::f32, t10,
4984 getF32Constant(DAG, 0x3f317234, dl));
4985 SDValue t12 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t11, X);
4986 TwoToFractionalPartOfX = DAG.getNode(ISD::FADD, dl, MVT::f32, t12,
4987 getF32Constant(DAG, 0x3f800000, dl));
4988 }
4989
4990 // Add the exponent into the result in integer domain.
4991 SDValue t13 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, TwoToFractionalPartOfX);
4992 return DAG.getNode(ISD::BITCAST, dl, MVT::f32,
4993 DAG.getNode(ISD::ADD, dl, MVT::i32, t13, IntegerPartOfX));
4994}
4995
4996/// expandExp - Lower an exp intrinsic. Handles the special sequences for
4997/// limited-precision mode.
4998static SDValue expandExp(const SDLoc &dl, SDValue Op, SelectionDAG &DAG,
4999 const TargetLowering &TLI, SDNodeFlags Flags) {
5000 if (Op.getValueType() == MVT::f32 &&
5001 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) {
5002
5003 // Put the exponent in the right bit position for later addition to the
5004 // final result:
5005 //
5006 // t0 = Op * log2(e)
5007
5008 // TODO: What fast-math-flags should be set here?
5009 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, Op,
5010 DAG.getConstantFP(numbers::log2ef, dl, MVT::f32));
5011 return getLimitedPrecisionExp2(t0, dl, DAG);
5012 }
5013
5014 // No special expansion.
5015 return DAG.getNode(ISD::FEXP, dl, Op.getValueType(), Op, Flags);
5016}
5017
5018/// expandLog - Lower a log intrinsic. Handles the special sequences for
5019/// limited-precision mode.
5020static SDValue expandLog(const SDLoc &dl, SDValue Op, SelectionDAG &DAG,
5021 const TargetLowering &TLI, SDNodeFlags Flags) {
5022 // TODO: What fast-math-flags should be set on the floating-point nodes?
5023
5024 if (Op.getValueType() == MVT::f32 &&
5025 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) {
5026 SDValue Op1 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Op);
5027
5028 // Scale the exponent by log(2).
5029 SDValue Exp = GetExponent(DAG, Op1, TLI, dl);
5030 SDValue LogOfExponent =
5031 DAG.getNode(ISD::FMUL, dl, MVT::f32, Exp,
5032 DAG.getConstantFP(numbers::ln2f, dl, MVT::f32));
5033
5034 // Get the significand and build it into a floating-point number with
5035 // exponent of 1.
5036 SDValue X = GetSignificand(DAG, Op1, dl);
5037
5038 SDValue LogOfMantissa;
5039 if (LimitFloatPrecision <= 6) {
5040 // For floating-point precision of 6:
5041 //
5042 // LogofMantissa =
5043 // -1.1609546f +
5044 // (1.4034025f - 0.23903021f * x) * x;
5045 //
5046 // error 0.0034276066, which is better than 8 bits
5047 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
5048 getF32Constant(DAG, 0xbe74c456, dl));
5049 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0,
5050 getF32Constant(DAG, 0x3fb3a2b1, dl));
5051 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X);
5052 LogOfMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2,
5053 getF32Constant(DAG, 0x3f949a29, dl));
5054 } else if (LimitFloatPrecision <= 12) {
5055 // For floating-point precision of 12:
5056 //
5057 // LogOfMantissa =
5058 // -1.7417939f +
5059 // (2.8212026f +
5060 // (-1.4699568f +
5061 // (0.44717955f - 0.56570851e-1f * x) * x) * x) * x;
5062 //
5063 // error 0.000061011436, which is 14 bits
5064 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
5065 getF32Constant(DAG, 0xbd67b6d6, dl));
5066 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0,
5067 getF32Constant(DAG, 0x3ee4f4b8, dl));
5068 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X);
5069 SDValue t3 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2,
5070 getF32Constant(DAG, 0x3fbc278b, dl));
5071 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
5072 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
5073 getF32Constant(DAG, 0x40348e95, dl));
5074 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X);
5075 LogOfMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t6,
5076 getF32Constant(DAG, 0x3fdef31a, dl));
5077 } else { // LimitFloatPrecision <= 18
5078 // For floating-point precision of 18:
5079 //
5080 // LogOfMantissa =
5081 // -2.1072184f +
5082 // (4.2372794f +
5083 // (-3.7029485f +
5084 // (2.2781945f +
5085 // (-0.87823314f +
5086 // (0.19073739f - 0.17809712e-1f * x) * x) * x) * x) * x)*x;
5087 //
5088 // error 0.0000023660568, which is better than 18 bits
5089 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
5090 getF32Constant(DAG, 0xbc91e5ac, dl));
5091 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0,
5092 getF32Constant(DAG, 0x3e4350aa, dl));
5093 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X);
5094 SDValue t3 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2,
5095 getF32Constant(DAG, 0x3f60d3e3, dl));
5096 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
5097 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
5098 getF32Constant(DAG, 0x4011cdf0, dl));
5099 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X);
5100 SDValue t7 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t6,
5101 getF32Constant(DAG, 0x406cfd1c, dl));
5102 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X);
5103 SDValue t9 = DAG.getNode(ISD::FADD, dl, MVT::f32, t8,
5104 getF32Constant(DAG, 0x408797cb, dl));
5105 SDValue t10 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t9, X);
5106 LogOfMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t10,
5107 getF32Constant(DAG, 0x4006dcab, dl));
5108 }
5109
5110 return DAG.getNode(ISD::FADD, dl, MVT::f32, LogOfExponent, LogOfMantissa);
5111 }
5112
5113 // No special expansion.
5114 return DAG.getNode(ISD::FLOG, dl, Op.getValueType(), Op, Flags);
5115}
5116
5117/// expandLog2 - Lower a log2 intrinsic. Handles the special sequences for
5118/// limited-precision mode.
5119static SDValue expandLog2(const SDLoc &dl, SDValue Op, SelectionDAG &DAG,
5120 const TargetLowering &TLI, SDNodeFlags Flags) {
5121 // TODO: What fast-math-flags should be set on the floating-point nodes?
5122
5123 if (Op.getValueType() == MVT::f32 &&
5124 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) {
5125 SDValue Op1 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Op);
5126
5127 // Get the exponent.
5128 SDValue LogOfExponent = GetExponent(DAG, Op1, TLI, dl);
5129
5130 // Get the significand and build it into a floating-point number with
5131 // exponent of 1.
5132 SDValue X = GetSignificand(DAG, Op1, dl);
5133
5134 // Different possible minimax approximations of significand in
5135 // floating-point for various degrees of accuracy over [1,2].
5136 SDValue Log2ofMantissa;
5137 if (LimitFloatPrecision <= 6) {
5138 // For floating-point precision of 6:
5139 //
5140 // Log2ofMantissa = -1.6749035f + (2.0246817f - .34484768f * x) * x;
5141 //
5142 // error 0.0049451742, which is more than 7 bits
5143 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
5144 getF32Constant(DAG, 0xbeb08fe0, dl));
5145 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0,
5146 getF32Constant(DAG, 0x40019463, dl));
5147 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X);
5148 Log2ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2,
5149 getF32Constant(DAG, 0x3fd6633d, dl));
5150 } else if (LimitFloatPrecision <= 12) {
5151 // For floating-point precision of 12:
5152 //
5153 // Log2ofMantissa =
5154 // -2.51285454f +
5155 // (4.07009056f +
5156 // (-2.12067489f +
5157 // (.645142248f - 0.816157886e-1f * x) * x) * x) * x;
5158 //
5159 // error 0.0000876136000, which is better than 13 bits
5160 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
5161 getF32Constant(DAG, 0xbda7262e, dl));
5162 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0,
5163 getF32Constant(DAG, 0x3f25280b, dl));
5164 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X);
5165 SDValue t3 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2,
5166 getF32Constant(DAG, 0x4007b923, dl));
5167 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
5168 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
5169 getF32Constant(DAG, 0x40823e2f, dl));
5170 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X);
5171 Log2ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t6,
5172 getF32Constant(DAG, 0x4020d29c, dl));
5173 } else { // LimitFloatPrecision <= 18
5174 // For floating-point precision of 18:
5175 //
5176 // Log2ofMantissa =
5177 // -3.0400495f +
5178 // (6.1129976f +
5179 // (-5.3420409f +
5180 // (3.2865683f +
5181 // (-1.2669343f +
5182 // (0.27515199f -
5183 // 0.25691327e-1f * x) * x) * x) * x) * x) * x;
5184 //
5185 // error 0.0000018516, which is better than 18 bits
5186 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
5187 getF32Constant(DAG, 0xbcd2769e, dl));
5188 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0,
5189 getF32Constant(DAG, 0x3e8ce0b9, dl));
5190 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X);
5191 SDValue t3 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2,
5192 getF32Constant(DAG, 0x3fa22ae7, dl));
5193 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
5194 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4,
5195 getF32Constant(DAG, 0x40525723, dl));
5196 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X);
5197 SDValue t7 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t6,
5198 getF32Constant(DAG, 0x40aaf200, dl));
5199 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X);
5200 SDValue t9 = DAG.getNode(ISD::FADD, dl, MVT::f32, t8,
5201 getF32Constant(DAG, 0x40c39dad, dl));
5202 SDValue t10 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t9, X);
5203 Log2ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t10,
5204 getF32Constant(DAG, 0x4042902c, dl));
5205 }
5206
5207 return DAG.getNode(ISD::FADD, dl, MVT::f32, LogOfExponent, Log2ofMantissa);
5208 }
5209
5210 // No special expansion.
5211 return DAG.getNode(ISD::FLOG2, dl, Op.getValueType(), Op, Flags);
5212}
5213
5214/// expandLog10 - Lower a log10 intrinsic. Handles the special sequences for
5215/// limited-precision mode.
5216static SDValue expandLog10(const SDLoc &dl, SDValue Op, SelectionDAG &DAG,
5217 const TargetLowering &TLI, SDNodeFlags Flags) {
5218 // TODO: What fast-math-flags should be set on the floating-point nodes?
5219
5220 if (Op.getValueType() == MVT::f32 &&
5221 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) {
5222 SDValue Op1 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Op);
5223
5224 // Scale the exponent by log10(2) [0.30102999f].
5225 SDValue Exp = GetExponent(DAG, Op1, TLI, dl);
5226 SDValue LogOfExponent = DAG.getNode(ISD::FMUL, dl, MVT::f32, Exp,
5227 getF32Constant(DAG, 0x3e9a209a, dl));
5228
5229 // Get the significand and build it into a floating-point number with
5230 // exponent of 1.
5231 SDValue X = GetSignificand(DAG, Op1, dl);
5232
5233 SDValue Log10ofMantissa;
5234 if (LimitFloatPrecision <= 6) {
5235 // For floating-point precision of 6:
5236 //
5237 // Log10ofMantissa =
5238 // -0.50419619f +
5239 // (0.60948995f - 0.10380950f * x) * x;
5240 //
5241 // error 0.0014886165, which is 6 bits
5242 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
5243 getF32Constant(DAG, 0xbdd49a13, dl));
5244 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0,
5245 getF32Constant(DAG, 0x3f1c0789, dl));
5246 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X);
5247 Log10ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2,
5248 getF32Constant(DAG, 0x3f011300, dl));
5249 } else if (LimitFloatPrecision <= 12) {
5250 // For floating-point precision of 12:
5251 //
5252 // Log10ofMantissa =
5253 // -0.64831180f +
5254 // (0.91751397f +
5255 // (-0.31664806f + 0.47637168e-1f * x) * x) * x;
5256 //
5257 // error 0.00019228036, which is better than 12 bits
5258 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
5259 getF32Constant(DAG, 0x3d431f31, dl));
5260 SDValue t1 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t0,
5261 getF32Constant(DAG, 0x3ea21fb2, dl));
5262 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X);
5263 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2,
5264 getF32Constant(DAG, 0x3f6ae232, dl));
5265 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
5266 Log10ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t4,
5267 getF32Constant(DAG, 0x3f25f7c3, dl));
5268 } else { // LimitFloatPrecision <= 18
5269 // For floating-point precision of 18:
5270 //
5271 // Log10ofMantissa =
5272 // -0.84299375f +
5273 // (1.5327582f +
5274 // (-1.0688956f +
5275 // (0.49102474f +
5276 // (-0.12539807f + 0.13508273e-1f * x) * x) * x) * x) * x;
5277 //
5278 // error 0.0000037995730, which is better than 18 bits
5279 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X,
5280 getF32Constant(DAG, 0x3c5d51ce, dl));
5281 SDValue t1 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t0,
5282 getF32Constant(DAG, 0x3e00685a, dl));
5283 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X);
5284 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2,
5285 getF32Constant(DAG, 0x3efb6798, dl));
5286 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X);
5287 SDValue t5 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t4,
5288 getF32Constant(DAG, 0x3f88d192, dl));
5289 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X);
5290 SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6,
5291 getF32Constant(DAG, 0x3fc4316c, dl));
5292 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X);
5293 Log10ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t8,
5294 getF32Constant(DAG, 0x3f57ce70, dl));
5295 }
5296
5297 return DAG.getNode(ISD::FADD, dl, MVT::f32, LogOfExponent, Log10ofMantissa);
5298 }
5299
5300 // No special expansion.
5301 return DAG.getNode(ISD::FLOG10, dl, Op.getValueType(), Op, Flags);
5302}
5303
5304/// expandExp2 - Lower an exp2 intrinsic. Handles the special sequences for
5305/// limited-precision mode.
5306static SDValue expandExp2(const SDLoc &dl, SDValue Op, SelectionDAG &DAG,
5307 const TargetLowering &TLI, SDNodeFlags Flags) {
5308 if (Op.getValueType() == MVT::f32 &&
5309 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18)
5310 return getLimitedPrecisionExp2(Op, dl, DAG);
5311
5312 // No special expansion.
5313 return DAG.getNode(ISD::FEXP2, dl, Op.getValueType(), Op, Flags);
5314}
5315
5316/// visitPow - Lower a pow intrinsic. Handles the special sequences for
5317/// limited-precision mode with x == 10.0f.
5318static SDValue expandPow(const SDLoc &dl, SDValue LHS, SDValue RHS,
5319 SelectionDAG &DAG, const TargetLowering &TLI,
5320 SDNodeFlags Flags) {
5321 bool IsExp10 = false;
5322 if (LHS.getValueType() == MVT::f32 && RHS.getValueType() == MVT::f32 &&
5323 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) {
5324 if (ConstantFPSDNode *LHSC = dyn_cast<ConstantFPSDNode>(LHS)) {
5325 APFloat Ten(10.0f);
5326 IsExp10 = LHSC->isExactlyValue(Ten);
5327 }
5328 }
5329
5330 // TODO: What fast-math-flags should be set on the FMUL node?
5331 if (IsExp10) {
5332 // Put the exponent in the right bit position for later addition to the
5333 // final result:
5334 //
5335 // #define LOG2OF10 3.3219281f
5336 // t0 = Op * LOG2OF10;
5337 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, RHS,
5338 getF32Constant(DAG, 0x40549a78, dl));
5339 return getLimitedPrecisionExp2(t0, dl, DAG);
5340 }
5341
5342 // No special expansion.
5343 return DAG.getNode(ISD::FPOW, dl, LHS.getValueType(), LHS, RHS, Flags);
5344}
5345
5346/// ExpandPowI - Expand a llvm.powi intrinsic.
5347static SDValue ExpandPowI(const SDLoc &DL, SDValue LHS, SDValue RHS,
5348 SelectionDAG &DAG) {
5349 // If RHS is a constant, we can expand this out to a multiplication tree,
5350 // otherwise we end up lowering to a call to __powidf2 (for example). When
5351 // optimizing for size, we only want to do this if the expansion would produce
5352 // a small number of multiplies, otherwise we do the full expansion.
5353 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS)) {
5354 // Get the exponent as a positive value.
5355 unsigned Val = RHSC->getSExtValue();
5356 if ((int)Val < 0) Val = -Val;
5357
5358 // powi(x, 0) -> 1.0
5359 if (Val == 0)
5360 return DAG.getConstantFP(1.0, DL, LHS.getValueType());
5361
5362 bool OptForSize = DAG.shouldOptForSize();
5363 if (!OptForSize ||
5364 // If optimizing for size, don't insert too many multiplies.
5365 // This inserts up to 5 multiplies.
5366 countPopulation(Val) + Log2_32(Val) < 7) {
5367 // We use the simple binary decomposition method to generate the multiply
5368 // sequence. There are more optimal ways to do this (for example,
5369 // powi(x,15) generates one more multiply than it should), but this has
5370 // the benefit of being both really simple and much better than a libcall.
5371 SDValue Res; // Logically starts equal to 1.0
5372 SDValue CurSquare = LHS;
5373 // TODO: Intrinsics should have fast-math-flags that propagate to these
5374 // nodes.
5375 while (Val) {
5376 if (Val & 1) {
5377 if (Res.getNode())
5378 Res = DAG.getNode(ISD::FMUL, DL,Res.getValueType(), Res, CurSquare);
5379 else
5380 Res = CurSquare; // 1.0*CurSquare.
5381 }
5382
5383 CurSquare = DAG.getNode(ISD::FMUL, DL, CurSquare.getValueType(),
5384 CurSquare, CurSquare);
5385 Val >>= 1;
5386 }
5387
5388 // If the original was negative, invert the result, producing 1/(x*x*x).
5389 if (RHSC->getSExtValue() < 0)
5390 Res = DAG.getNode(ISD::FDIV, DL, LHS.getValueType(),
5391 DAG.getConstantFP(1.0, DL, LHS.getValueType()), Res);
5392 return Res;
5393 }
5394 }
5395
5396 // Otherwise, expand to a libcall.
5397 return DAG.getNode(ISD::FPOWI, DL, LHS.getValueType(), LHS, RHS);
5398}
5399
5400static SDValue expandDivFix(unsigned Opcode, const SDLoc &DL,
5401 SDValue LHS, SDValue RHS, SDValue Scale,
5402 SelectionDAG &DAG, const TargetLowering &TLI) {
5403 EVT VT = LHS.getValueType();
5404 bool Signed = Opcode == ISD::SDIVFIX || Opcode == ISD::SDIVFIXSAT;
5405 bool Saturating = Opcode == ISD::SDIVFIXSAT || Opcode == ISD::UDIVFIXSAT;
5406 LLVMContext &Ctx = *DAG.getContext();
5407
5408 // If the type is legal but the operation isn't, this node might survive all
5409 // the way to operation legalization. If we end up there and we do not have
5410 // the ability to widen the type (if VT*2 is not legal), we cannot expand the
5411 // node.
5412
5413 // Coax the legalizer into expanding the node during type legalization instead
5414 // by bumping the size by one bit. This will force it to Promote, enabling the
5415 // early expansion and avoiding the need to expand later.
5416
5417 // We don't have to do this if Scale is 0; that can always be expanded, unless
5418 // it's a saturating signed operation. Those can experience true integer
5419 // division overflow, a case which we must avoid.
5420
5421 // FIXME: We wouldn't have to do this (or any of the early
5422 // expansion/promotion) if it was possible to expand a libcall of an
5423 // illegal type during operation legalization. But it's not, so things
5424 // get a bit hacky.
5425 unsigned ScaleInt = cast<ConstantSDNode>(Scale)->getZExtValue();
5426 if ((ScaleInt > 0 || (Saturating && Signed)) &&
5427 (TLI.isTypeLegal(VT) ||
5428 (VT.isVector() && TLI.isTypeLegal(VT.getVectorElementType())))) {
5429 TargetLowering::LegalizeAction Action = TLI.getFixedPointOperationAction(
5430 Opcode, VT, ScaleInt);
5431 if (Action != TargetLowering::Legal && Action != TargetLowering::Custom) {
5432 EVT PromVT;
5433 if (VT.isScalarInteger())
5434 PromVT = EVT::getIntegerVT(Ctx, VT.getSizeInBits() + 1);
5435 else if (VT.isVector()) {
5436 PromVT = VT.getVectorElementType();
5437 PromVT = EVT::getIntegerVT(Ctx, PromVT.getSizeInBits() + 1);
5438 PromVT = EVT::getVectorVT(Ctx, PromVT, VT.getVectorElementCount());
5439 } else
5440 llvm_unreachable("Wrong VT for DIVFIX?")__builtin_unreachable();
5441 if (Signed) {
5442 LHS = DAG.getSExtOrTrunc(LHS, DL, PromVT);
5443 RHS = DAG.getSExtOrTrunc(RHS, DL, PromVT);
5444 } else {
5445 LHS = DAG.getZExtOrTrunc(LHS, DL, PromVT);
5446 RHS = DAG.getZExtOrTrunc(RHS, DL, PromVT);
5447 }
5448 EVT ShiftTy = TLI.getShiftAmountTy(PromVT, DAG.getDataLayout());
5449 // For saturating operations, we need to shift up the LHS to get the
5450 // proper saturation width, and then shift down again afterwards.
5451 if (Saturating)
5452 LHS = DAG.getNode(ISD::SHL, DL, PromVT, LHS,
5453 DAG.getConstant(1, DL, ShiftTy));
5454 SDValue Res = DAG.getNode(Opcode, DL, PromVT, LHS, RHS, Scale);
5455 if (Saturating)
5456 Res = DAG.getNode(Signed ? ISD::SRA : ISD::SRL, DL, PromVT, Res,
5457 DAG.getConstant(1, DL, ShiftTy));
5458 return DAG.getZExtOrTrunc(Res, DL, VT);
5459 }
5460 }
5461
5462 return DAG.getNode(Opcode, DL, VT, LHS, RHS, Scale);
5463}
5464
5465// getUnderlyingArgRegs - Find underlying registers used for a truncated,
5466// bitcasted, or split argument. Returns a list of <Register, size in bits>
5467static void
5468getUnderlyingArgRegs(SmallVectorImpl<std::pair<unsigned, TypeSize>> &Regs,
5469 const SDValue &N) {
5470 switch (N.getOpcode()) {
5471 case ISD::CopyFromReg: {
5472 SDValue Op = N.getOperand(1);
5473 Regs.emplace_back(cast<RegisterSDNode>(Op)->getReg(),
5474 Op.getValueType().getSizeInBits());
5475 return;
5476 }
5477 case ISD::BITCAST:
5478 case ISD::AssertZext:
5479 case ISD::AssertSext:
5480 case ISD::TRUNCATE:
5481 getUnderlyingArgRegs(Regs, N.getOperand(0));
5482 return;
5483 case ISD::BUILD_PAIR:
5484 case ISD::BUILD_VECTOR:
5485 case ISD::CONCAT_VECTORS:
5486 for (SDValue Op : N->op_values())
5487 getUnderlyingArgRegs(Regs, Op);
5488 return;
5489 default:
5490 return;
5491 }
5492}
5493
5494/// If the DbgValueInst is a dbg_value of a function argument, create the
5495/// corresponding DBG_VALUE machine instruction for it now. At the end of
5496/// instruction selection, they will be inserted to the entry BB.
5497/// We don't currently support this for variadic dbg_values, as they shouldn't
5498/// appear for function arguments or in the prologue.
5499bool SelectionDAGBuilder::EmitFuncArgumentDbgValue(
5500 const Value *V, DILocalVariable *Variable, DIExpression *Expr,
5501 DILocation *DL, bool IsDbgDeclare, const SDValue &N) {
5502 const Argument *Arg = dyn_cast<Argument>(V);
5503 if (!Arg)
5504 return false;
5505
5506 MachineFunction &MF = DAG.getMachineFunction();
5507 const TargetInstrInfo *TII = DAG.getSubtarget().getInstrInfo();
5508
5509 // Helper to create DBG_INSTR_REFs or DBG_VALUEs, depending on what kind
5510 // we've been asked to pursue.
5511 auto MakeVRegDbgValue = [&](Register Reg, DIExpression *FragExpr,
5512 bool Indirect) {
5513 if (Reg.isVirtual() && TM.Options.ValueTrackingVariableLocations) {
5514 // For VRegs, in instruction referencing mode, create a DBG_INSTR_REF
5515 // pointing at the VReg, which will be patched up later.
5516 auto &Inst = TII->get(TargetOpcode::DBG_INSTR_REF);
5517 auto MIB = BuildMI(MF, DL, Inst);
5518 MIB.addReg(Reg, RegState::Debug);
5519 MIB.addImm(0);
5520 MIB.addMetadata(Variable);
5521 auto *NewDIExpr = FragExpr;
5522 // We don't have an "Indirect" field in DBG_INSTR_REF, fold that into
5523 // the DIExpression.
5524 if (Indirect)
5525 NewDIExpr = DIExpression::prepend(FragExpr, DIExpression::DerefBefore);
5526 MIB.addMetadata(NewDIExpr);
5527 return MIB;
5528 } else {
5529 // Create a completely standard DBG_VALUE.
5530 auto &Inst = TII->get(TargetOpcode::DBG_VALUE);
5531 return BuildMI(MF, DL, Inst, Indirect, Reg, Variable, FragExpr);
5532 }
5533 };
5534
5535 if (!IsDbgDeclare) {
5536 // ArgDbgValues are hoisted to the beginning of the entry block. So we
5537 // should only emit as ArgDbgValue if the dbg.value intrinsic is found in
5538 // the entry block.
5539 bool IsInEntryBlock = FuncInfo.MBB == &FuncInfo.MF->front();
5540 if (!IsInEntryBlock)
5541 return false;
5542
5543 // ArgDbgValues are hoisted to the beginning of the entry block. So we
5544 // should only emit as ArgDbgValue if the dbg.value intrinsic describes a
5545 // variable that also is a param.
5546 //
5547 // Although, if we are at the top of the entry block already, we can still
5548 // emit using ArgDbgValue. This might catch some situations when the
5549 // dbg.value refers to an argument that isn't used in the entry block, so
5550 // any CopyToReg node would be optimized out and the only way to express
5551 // this DBG_VALUE is by using the physical reg (or FI) as done in this
5552 // method. ArgDbgValues are hoisted to the beginning of the entry block. So
5553 // we should only emit as ArgDbgValue if the Variable is an argument to the
5554 // current function, and the dbg.value intrinsic is found in the entry
5555 // block.
5556 bool VariableIsFunctionInputArg = Variable->isParameter() &&
5557 !DL->getInlinedAt();
5558 bool IsInPrologue = SDNodeOrder == LowestSDNodeOrder;
5559 if (!IsInPrologue && !VariableIsFunctionInputArg)
5560 return false;
5561
5562 // Here we assume that a function argument on IR level only can be used to
5563 // describe one input parameter on source level. If we for example have
5564 // source code like this
5565 //
5566 // struct A { long x, y; };
5567 // void foo(struct A a, long b) {
5568 // ...
5569 // b = a.x;
5570 // ...
5571 // }
5572 //
5573 // and IR like this
5574 //
5575 // define void @foo(i32 %a1, i32 %a2, i32 %b) {
5576 // entry:
5577 // call void @llvm.dbg.value(metadata i32 %a1, "a", DW_OP_LLVM_fragment
5578 // call void @llvm.dbg.value(metadata i32 %a2, "a", DW_OP_LLVM_fragment
5579 // call void @llvm.dbg.value(metadata i32 %b, "b",
5580 // ...
5581 // call void @llvm.dbg.value(metadata i32 %a1, "b"
5582 // ...
5583 //
5584 // then the last dbg.value is describing a parameter "b" using a value that
5585 // is an argument. But since we already has used %a1 to describe a parameter
5586 // we should not handle that last dbg.value here (that would result in an
5587 // incorrect hoisting of the DBG_VALUE to the function entry).
5588 // Notice that we allow one dbg.value per IR level argument, to accommodate
5589 // for the situation with fragments above.
5590 if (VariableIsFunctionInputArg) {
5591 unsigned ArgNo = Arg->getArgNo();
5592 if (ArgNo >= FuncInfo.DescribedArgs.size())
5593 FuncInfo.DescribedArgs.resize(ArgNo + 1, false);
5594 else if (!IsInPrologue && FuncInfo.DescribedArgs.test(ArgNo))
5595 return false;
5596 FuncInfo.DescribedArgs.set(ArgNo);
5597 }
5598 }
5599
5600 bool IsIndirect = false;
5601 Optional<MachineOperand> Op;
5602 // Some arguments' frame index is recorded during argument lowering.
5603 int FI = FuncInfo.getArgumentFrameIndex(Arg);
5604 if (FI != std::numeric_limits<int>::max())
5605 Op = MachineOperand::CreateFI(FI);
5606
5607 SmallVector<std::pair<unsigned, TypeSize>, 8> ArgRegsAndSizes;
5608 if (!Op && N.getNode()) {
5609 getUnderlyingArgRegs(ArgRegsAndSizes, N);
5610 Register Reg;
5611 if (ArgRegsAndSizes.size() == 1)
5612 Reg = ArgRegsAndSizes.front().first;
5613
5614 if (Reg && Reg.isVirtual()) {
5615 MachineRegisterInfo &RegInfo = MF.getRegInfo();
5616 Register PR = RegInfo.getLiveInPhysReg(Reg);
5617 if (PR)
5618 Reg = PR;
5619 }
5620 if (Reg) {
5621 Op = MachineOperand::CreateReg(Reg, false);
5622 IsIndirect = IsDbgDeclare;
5623 }
5624 }
5625
5626 if (!Op && N.getNode()) {
5627 // Check if frame index is available.
5628 SDValue LCandidate = peekThroughBitcasts(N);
5629 if (LoadSDNode *LNode = dyn_cast<LoadSDNode>(LCandidate.getNode()))
5630 if (FrameIndexSDNode *FINode =
5631 dyn_cast<FrameIndexSDNode>(LNode->getBasePtr().getNode()))
5632 Op = MachineOperand::CreateFI(FINode->getIndex());
5633 }
5634
5635 if (!Op) {
5636 // Create a DBG_VALUE for each decomposed value in ArgRegs to cover Reg
5637 auto splitMultiRegDbgValue = [&](ArrayRef<std::pair<unsigned, TypeSize>>
5638 SplitRegs) {
5639 unsigned Offset = 0;
5640 for (auto RegAndSize : SplitRegs) {
5641 // If the expression is already a fragment, the current register
5642 // offset+size might extend beyond the fragment. In this case, only
5643 // the register bits that are inside the fragment are relevant.
5644 int RegFragmentSizeInBits = RegAndSize.second;
5645 if (auto ExprFragmentInfo = Expr->getFragmentInfo()) {
5646 uint64_t ExprFragmentSizeInBits = ExprFragmentInfo->SizeInBits;
5647 // The register is entirely outside the expression fragment,
5648 // so is irrelevant for debug info.
5649 if (Offset >= ExprFragmentSizeInBits)
5650 break;
5651 // The register is partially outside the expression fragment, only
5652 // the low bits within the fragment are relevant for debug info.
5653 if (Offset + RegFragmentSizeInBits > ExprFragmentSizeInBits) {
5654 RegFragmentSizeInBits = ExprFragmentSizeInBits - Offset;
5655 }
5656 }
5657
5658 auto FragmentExpr = DIExpression::createFragmentExpression(
5659 Expr, Offset, RegFragmentSizeInBits);
5660 Offset += RegAndSize.second;
5661 // If a valid fragment expression cannot be created, the variable's
5662 // correct value cannot be determined and so it is set as Undef.
5663 if (!FragmentExpr) {
5664 SDDbgValue *SDV = DAG.getConstantDbgValue(
5665 Variable, Expr, UndefValue::get(V->getType()), DL, SDNodeOrder);
5666 DAG.AddDbgValue(SDV, false);
5667 continue;
5668 }
5669 MachineInstr *NewMI =
5670 MakeVRegDbgValue(RegAndSize.first, *FragmentExpr, IsDbgDeclare);
5671 FuncInfo.ArgDbgValues.push_back(NewMI);
5672 }
5673 };
5674
5675 // Check if ValueMap has reg number.
5676 DenseMap<const Value *, Register>::const_iterator
5677 VMI = FuncInfo.ValueMap.find(V);
5678 if (VMI != FuncInfo.ValueMap.end()) {
5679 const auto &TLI = DAG.getTargetLoweringInfo();
5680 RegsForValue RFV(V->getContext(), TLI, DAG.getDataLayout(), VMI->second,
5681 V->getType(), None);
5682 if (RFV.occupiesMultipleRegs()) {
5683 splitMultiRegDbgValue(RFV.getRegsAndSizes());
5684 return true;
5685 }
5686
5687 Op = MachineOperand::CreateReg(VMI->second, false);
5688 IsIndirect = IsDbgDeclare;
5689 } else if (ArgRegsAndSizes.size() > 1) {
5690 // This was split due to the calling convention, and no virtual register
5691 // mapping exists for the value.
5692 splitMultiRegDbgValue(ArgRegsAndSizes);
5693 return true;
5694 }
5695 }
5696
5697 if (!Op)
5698 return false;
5699
5700 assert(Variable->isValidLocationForIntrinsic(DL) &&((void)0)
5701 "Expected inlined-at fields to agree")((void)0);
5702 MachineInstr *NewMI = nullptr;
5703
5704 if (Op->isReg())
5705 NewMI = MakeVRegDbgValue(Op->getReg(), Expr, IsIndirect);
5706 else
5707 NewMI = BuildMI(MF, DL, TII->get(TargetOpcode::DBG_VALUE), true, *Op,
5708 Variable, Expr);
5709
5710 FuncInfo.ArgDbgValues.push_back(NewMI);
5711 return true;
5712}
5713
5714/// Return the appropriate SDDbgValue based on N.
5715SDDbgValue *SelectionDAGBuilder::getDbgValue(SDValue N,
5716 DILocalVariable *Variable,
5717 DIExpression *Expr,
5718 const DebugLoc &dl,
5719 unsigned DbgSDNodeOrder) {
5720 if (auto *FISDN = dyn_cast<FrameIndexSDNode>(N.getNode())) {
5721 // Construct a FrameIndexDbgValue for FrameIndexSDNodes so we can describe
5722 // stack slot locations.
5723 //
5724 // Consider "int x = 0; int *px = &x;". There are two kinds of interesting
5725 // debug values here after optimization:
5726 //
5727 // dbg.value(i32* %px, !"int *px", !DIExpression()), and
5728 // dbg.value(i32* %px, !"int x", !DIExpression(DW_OP_deref))
5729 //
5730 // Both describe the direct values of their associated variables.
5731 return DAG.getFrameIndexDbgValue(Variable, Expr, FISDN->getIndex(),
5732 /*IsIndirect*/ false, dl, DbgSDNodeOrder);
5733 }
5734 return DAG.getDbgValue(Variable, Expr, N.getNode(), N.getResNo(),
5735 /*IsIndirect*/ false, dl, DbgSDNodeOrder);
5736}
5737
5738static unsigned FixedPointIntrinsicToOpcode(unsigned Intrinsic) {
5739 switch (Intrinsic) {
5740 case Intrinsic::smul_fix:
5741 return ISD::SMULFIX;
5742 case Intrinsic::umul_fix:
5743 return ISD::UMULFIX;
5744 case Intrinsic::smul_fix_sat:
5745 return ISD::SMULFIXSAT;
5746 case Intrinsic::umul_fix_sat:
5747 return ISD::UMULFIXSAT;
5748 case Intrinsic::sdiv_fix:
5749 return ISD::SDIVFIX;
5750 case Intrinsic::udiv_fix:
5751 return ISD::UDIVFIX;
5752 case Intrinsic::sdiv_fix_sat:
5753 return ISD::SDIVFIXSAT;
5754 case Intrinsic::udiv_fix_sat:
5755 return ISD::UDIVFIXSAT;
5756 default:
5757 llvm_unreachable("Unhandled fixed point intrinsic")__builtin_unreachable();
5758 }
5759}
5760
5761void SelectionDAGBuilder::lowerCallToExternalSymbol(const CallInst &I,
5762 const char *FunctionName) {
5763 assert(FunctionName && "FunctionName must not be nullptr")((void)0);
5764 SDValue Callee = DAG.getExternalSymbol(
5765 FunctionName,
5766 DAG.getTargetLoweringInfo().getPointerTy(DAG.getDataLayout()));
5767 LowerCallTo(I, Callee, I.isTailCall(), I.isMustTailCall());
5768}
5769
5770/// Given a @llvm.call.preallocated.setup, return the corresponding
5771/// preallocated call.
5772static const CallBase *FindPreallocatedCall(const Value *PreallocatedSetup) {
5773 assert(cast<CallBase>(PreallocatedSetup)((void)0)
5774 ->getCalledFunction()((void)0)
5775 ->getIntrinsicID() == Intrinsic::call_preallocated_setup &&((void)0)
5776 "expected call_preallocated_setup Value")((void)0);
5777 for (auto *U : PreallocatedSetup->users()) {
5778 auto *UseCall = cast<CallBase>(U);
5779 const Function *Fn = UseCall->getCalledFunction();
5780 if (!Fn || Fn->getIntrinsicID() != Intrinsic::call_preallocated_arg) {
5781 return UseCall;
5782 }
5783 }
5784 llvm_unreachable("expected corresponding call to preallocated setup/arg")__builtin_unreachable();
5785}
5786
5787/// Lower the call to the specified intrinsic function.
5788void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
5789 unsigned Intrinsic) {
5790 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
5791 SDLoc sdl = getCurSDLoc();
5792 DebugLoc dl = getCurDebugLoc();
5793 SDValue Res;
5794
5795 SDNodeFlags Flags;
5796 if (auto *FPOp = dyn_cast<FPMathOperator>(&I))
5797 Flags.copyFMF(*FPOp);
5798
5799 switch (Intrinsic) {
5800 default:
5801 // By default, turn this into a target intrinsic node.
5802 visitTargetIntrinsic(I, Intrinsic);
5803 return;
5804 case Intrinsic::vscale: {
5805 match(&I, m_VScale(DAG.getDataLayout()));
5806 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
5807 setValue(&I,
5808 DAG.getVScale(getCurSDLoc(), VT, APInt(VT.getSizeInBits(), 1)));
5809 return;
5810 }
5811 case Intrinsic::vastart: visitVAStart(I); return;
5812 case Intrinsic::vaend: visitVAEnd(I); return;
5813 case Intrinsic::vacopy: visitVACopy(I); return;
5814 case Intrinsic::returnaddress:
5815 setValue(&I, DAG.getNode(ISD::RETURNADDR, sdl,
5816 TLI.getPointerTy(DAG.getDataLayout()),
5817 getValue(I.getArgOperand(0))));
5818 return;
5819 case Intrinsic::addressofreturnaddress:
5820 setValue(&I, DAG.getNode(ISD::ADDROFRETURNADDR, sdl,
5821 TLI.getPointerTy(DAG.getDataLayout())));
5822 return;
5823 case Intrinsic::sponentry:
5824 setValue(&I, DAG.getNode(ISD::SPONENTRY, sdl,
5825 TLI.getFrameIndexTy(DAG.getDataLayout())));
5826 return;
5827 case Intrinsic::frameaddress:
5828 setValue(&I, DAG.getNode(ISD::FRAMEADDR, sdl,
5829 TLI.getFrameIndexTy(DAG.getDataLayout()),
5830 getValue(I.getArgOperand(0))));
5831 return;
5832 case Intrinsic::read_volatile_register:
5833 case Intrinsic::read_register: {
5834 Value *Reg = I.getArgOperand(0);
5835 SDValue Chain = getRoot();
5836 SDValue RegName =
5837 DAG.getMDNode(cast<MDNode>(cast<MetadataAsValue>(Reg)->getMetadata()));
5838 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
5839 Res = DAG.getNode(ISD::READ_REGISTER, sdl,
5840 DAG.getVTList(VT, MVT::Other), Chain, RegName);
5841 setValue(&I, Res);
5842 DAG.setRoot(Res.getValue(1));
5843 return;
5844 }
5845 case Intrinsic::write_register: {
5846 Value *Reg = I.getArgOperand(0);
5847 Value *RegValue = I.getArgOperand(1);
5848 SDValue Chain = getRoot();
5849 SDValue RegName =
5850 DAG.getMDNode(cast<MDNode>(cast<MetadataAsValue>(Reg)->getMetadata()));
5851 DAG.setRoot(DAG.getNode(ISD::WRITE_REGISTER, sdl, MVT::Other, Chain,
5852 RegName, getValue(RegValue)));
5853 return;
5854 }
5855 case Intrinsic::memcpy: {
5856 const auto &MCI = cast<MemCpyInst>(I);
5857 SDValue Op1 = getValue(I.getArgOperand(0));
5858 SDValue Op2 = getValue(I.getArgOperand(1));
5859 SDValue Op3 = getValue(I.getArgOperand(2));
5860 // @llvm.memcpy defines 0 and 1 to both mean no alignment.
5861 Align DstAlign = MCI.getDestAlign().valueOrOne();
5862 Align SrcAlign = MCI.getSourceAlign().valueOrOne();
5863 Align Alignment = commonAlignment(DstAlign, SrcAlign);
5864 bool isVol = MCI.isVolatile();
5865 bool isTC = I.isTailCall() && isInTailCallPosition(I, DAG.getTarget());
5866 // FIXME: Support passing different dest/src alignments to the memcpy DAG
5867 // node.
5868 SDValue Root = isVol ? getRoot() : getMemoryRoot();
5869 AAMDNodes AAInfo;
5870 I.getAAMetadata(AAInfo);
5871 SDValue MC = DAG.getMemcpy(Root, sdl, Op1, Op2, Op3, Alignment, isVol,
5872 /* AlwaysInline */ false, isTC,
5873 MachinePointerInfo(I.getArgOperand(0)),
5874 MachinePointerInfo(I.getArgOperand(1)), AAInfo);
5875 updateDAGForMaybeTailCall(MC);
5876 return;
5877 }
5878 case Intrinsic::memcpy_inline: {
5879 const auto &MCI = cast<MemCpyInlineInst>(I);
5880 SDValue Dst = getValue(I.getArgOperand(0));
5881 SDValue Src = getValue(I.getArgOperand(1));
5882 SDValue Size = getValue(I.getArgOperand(2));
5883 assert(isa<ConstantSDNode>(Size) && "memcpy_inline needs constant size")((void)0);
5884 // @llvm.memcpy.inline defines 0 and 1 to both mean no alignment.
5885 Align DstAlign = MCI.getDestAlign().valueOrOne();
5886 Align SrcAlign = MCI.getSourceAlign().valueOrOne();
5887 Align Alignment = commonAlignment(DstAlign, SrcAlign);
5888 bool isVol = MCI.isVolatile();
5889 bool isTC = I.isTailCall() && isInTailCallPosition(I, DAG.getTarget());
5890 // FIXME: Support passing different dest/src alignments to the memcpy DAG
5891 // node.
5892 AAMDNodes AAInfo;
5893 I.getAAMetadata(AAInfo);
5894 SDValue MC = DAG.getMemcpy(getRoot(), sdl, Dst, Src, Size, Alignment, isVol,
5895 /* AlwaysInline */ true, isTC,
5896 MachinePointerInfo(I.getArgOperand(0)),
5897 MachinePointerInfo(I.getArgOperand(1)), AAInfo);
5898 updateDAGForMaybeTailCall(MC);
5899 return;
5900 }
5901 case Intrinsic::memset: {
5902 const auto &MSI = cast<MemSetInst>(I);
5903 SDValue Op1 = getValue(I.getArgOperand(0));
5904 SDValue Op2 = getValue(I.getArgOperand(1));
5905 SDValue Op3 = getValue(I.getArgOperand(2));
5906 // @llvm.memset defines 0 and 1 to both mean no alignment.
5907 Align Alignment = MSI.getDestAlign().valueOrOne();
5908 bool isVol = MSI.isVolatile();
5909 bool isTC = I.isTailCall() && isInTailCallPosition(I, DAG.getTarget());
5910 SDValue Root = isVol ? getRoot() : getMemoryRoot();
5911 AAMDNodes AAInfo;
5912 I.getAAMetadata(AAInfo);
5913 SDValue MS = DAG.getMemset(Root, sdl, Op1, Op2, Op3, Alignment, isVol, isTC,
5914 MachinePointerInfo(I.getArgOperand(0)), AAInfo);
5915 updateDAGForMaybeTailCall(MS);
5916 return;
5917 }
5918 case Intrinsic::memmove: {
5919 const auto &MMI = cast<MemMoveInst>(I);
5920 SDValue Op1 = getValue(I.getArgOperand(0));
5921 SDValue Op2 = getValue(I.getArgOperand(1));
5922 SDValue Op3 = getValue(I.getArgOperand(2));
5923 // @llvm.memmove defines 0 and 1 to both mean no alignment.
5924 Align DstAlign = MMI.getDestAlign().valueOrOne();
5925 Align SrcAlign = MMI.getSourceAlign().valueOrOne();
5926 Align Alignment = commonAlignment(DstAlign, SrcAlign);
5927 bool isVol = MMI.isVolatile();
5928 bool isTC = I.isTailCall() && isInTailCallPosition(I, DAG.getTarget());
5929 // FIXME: Support passing different dest/src alignments to the memmove DAG
5930 // node.
5931 SDValue Root = isVol ? getRoot() : getMemoryRoot();
5932 AAMDNodes AAInfo;
5933 I.getAAMetadata(AAInfo);
5934 SDValue MM = DAG.getMemmove(Root, sdl, Op1, Op2, Op3, Alignment, isVol,
5935 isTC, MachinePointerInfo(I.getArgOperand(0)),
5936 MachinePointerInfo(I.getArgOperand(1)), AAInfo);
5937 updateDAGForMaybeTailCall(MM);
5938 return;
5939 }
5940 case Intrinsic::memcpy_element_unordered_atomic: {
5941 const AtomicMemCpyInst &MI = cast<AtomicMemCpyInst>(I);
5942 SDValue Dst = getValue(MI.getRawDest());
5943 SDValue Src = getValue(MI.getRawSource());
5944 SDValue Length = getValue(MI.getLength());
5945
5946 unsigned DstAlign = MI.getDestAlignment();
5947 unsigned SrcAlign = MI.getSourceAlignment();
5948 Type *LengthTy = MI.getLength()->getType();
5949 unsigned ElemSz = MI.getElementSizeInBytes();
5950 bool isTC = I.isTailCall() && isInTailCallPosition(I, DAG.getTarget());
5951 SDValue MC = DAG.getAtomicMemcpy(getRoot(), sdl, Dst, DstAlign, Src,
5952 SrcAlign, Length, LengthTy, ElemSz, isTC,
5953 MachinePointerInfo(MI.getRawDest()),
5954 MachinePointerInfo(MI.getRawSource()));
5955 updateDAGForMaybeTailCall(MC);
5956 return;
5957 }
5958 case Intrinsic::memmove_element_unordered_atomic: {
5959 auto &MI = cast<AtomicMemMoveInst>(I);
5960 SDValue Dst = getValue(MI.getRawDest());
5961 SDValue Src = getValue(MI.getRawSource());
5962 SDValue Length = getValue(MI.getLength());
5963
5964 unsigned DstAlign = MI.getDestAlignment();
5965 unsigned SrcAlign = MI.getSourceAlignment();
5966 Type *LengthTy = MI.getLength()->getType();
5967 unsigned ElemSz = MI.getElementSizeInBytes();
5968 bool isTC = I.isTailCall() && isInTailCallPosition(I, DAG.getTarget());
5969 SDValue MC = DAG.getAtomicMemmove(getRoot(), sdl, Dst, DstAlign, Src,
5970 SrcAlign, Length, LengthTy, ElemSz, isTC,
5971 MachinePointerInfo(MI.getRawDest()),
5972 MachinePointerInfo(MI.getRawSource()));
5973 updateDAGForMaybeTailCall(MC);
5974 return;
5975 }
5976 case Intrinsic::memset_element_unordered_atomic: {
5977 auto &MI = cast<AtomicMemSetInst>(I);
5978 SDValue Dst = getValue(MI.getRawDest());
5979 SDValue Val = getValue(MI.getValue());
5980 SDValue Length = getValue(MI.getLength());
5981
5982 unsigned DstAlign = MI.getDestAlignment();
5983 Type *LengthTy = MI.getLength()->getType();
5984 unsigned ElemSz = MI.getElementSizeInBytes();
5985 bool isTC = I.isTailCall() && isInTailCallPosition(I, DAG.getTarget());
5986 SDValue MC = DAG.getAtomicMemset(getRoot(), sdl, Dst, DstAlign, Val, Length,
5987 LengthTy, ElemSz, isTC,
5988 MachinePointerInfo(MI.getRawDest()));
5989 updateDAGForMaybeTailCall(MC);
5990 return;
5991 }
5992 case Intrinsic::call_preallocated_setup: {
5993 const CallBase *PreallocatedCall = FindPreallocatedCall(&I);
5994 SDValue SrcValue = DAG.getSrcValue(PreallocatedCall);
5995 SDValue Res = DAG.getNode(ISD::PREALLOCATED_SETUP, sdl, MVT::Other,
5996 getRoot(), SrcValue);
5997 setValue(&I, Res);
5998 DAG.setRoot(Res);
5999 return;
6000 }
6001 case Intrinsic::call_preallocated_arg: {
6002 const CallBase *PreallocatedCall = FindPreallocatedCall(I.getOperand(0));
6003 SDValue SrcValue = DAG.getSrcValue(PreallocatedCall);
6004 SDValue Ops[3];
6005 Ops[0] = getRoot();
6006 Ops[1] = SrcValue;
6007 Ops[2] = DAG.getTargetConstant(*cast<ConstantInt>(I.getArgOperand(1)), sdl,
6008 MVT::i32); // arg index
6009 SDValue Res = DAG.getNode(
6010 ISD::PREALLOCATED_ARG, sdl,
6011 DAG.getVTList(TLI.getPointerTy(DAG.getDataLayout()), MVT::Other), Ops);
6012 setValue(&I, Res);
6013 DAG.setRoot(Res.getValue(1));
6014 return;
6015 }
6016 case Intrinsic::dbg_addr:
6017 case Intrinsic::dbg_declare: {
6018 // Assume dbg.addr and dbg.declare can not currently use DIArgList, i.e.
6019 // they are non-variadic.
6020 const auto &DI = cast<DbgVariableIntrinsic>(I);
6021 assert(!DI.hasArgList() && "Only dbg.value should currently use DIArgList")((void)0);
6022 DILocalVariable *Variable = DI.getVariable();
6023 DIExpression *Expression = DI.getExpression();
6024 dropDanglingDebugInfo(Variable, Expression);
6025 assert(Variable && "Missing variable")((void)0);
6026 LLVM_DEBUG(dbgs() << "SelectionDAG visiting debug intrinsic: " << DIdo { } while (false)
6027 << "\n")do { } while (false);
6028 // Check if address has undef value.
6029 const Value *Address = DI.getVariableLocationOp(0);
6030 if (!Address || isa<UndefValue>(Address) ||
6031 (Address->use_empty() && !isa<Argument>(Address))) {
6032 LLVM_DEBUG(dbgs() << "Dropping debug info for " << DIdo { } while (false)
6033 << " (bad/undef/unused-arg address)\n")do { } while (false);
6034 return;
6035 }
6036
6037 bool isParameter = Variable->isParameter() || isa<Argument>(Address);
6038
6039 // Check if this variable can be described by a frame index, typically
6040 // either as a static alloca or a byval parameter.
6041 int FI = std::numeric_limits<int>::max();
6042 if (const auto *AI =
6043 dyn_cast<AllocaInst>(Address->stripInBoundsConstantOffsets())) {
6044 if (AI->isStaticAlloca()) {
6045 auto I = FuncInfo.StaticAllocaMap.find(AI);
6046 if (I != FuncInfo.StaticAllocaMap.end())
6047 FI = I->second;
6048 }
6049 } else if (const auto *Arg = dyn_cast<Argument>(
6050 Address->stripInBoundsConstantOffsets())) {
6051 FI = FuncInfo.getArgumentFrameIndex(Arg);
6052 }
6053
6054 // llvm.dbg.addr is control dependent and always generates indirect
6055 // DBG_VALUE instructions. llvm.dbg.declare is handled as a frame index in
6056 // the MachineFunction variable table.
6057 if (FI != std::numeric_limits<int>::max()) {
6058 if (Intrinsic == Intrinsic::dbg_addr) {
6059 SDDbgValue *SDV = DAG.getFrameIndexDbgValue(
6060 Variable, Expression, FI, getRoot().getNode(), /*IsIndirect*/ true,
6061 dl, SDNodeOrder);
6062 DAG.AddDbgValue(SDV, isParameter);
6063 } else {
6064 LLVM_DEBUG(dbgs() << "Skipping " << DIdo { } while (false)
6065 << " (variable info stashed in MF side table)\n")do { } while (false);
6066 }
6067 return;
6068 }
6069
6070 SDValue &N = NodeMap[Address];
6071 if (!N.getNode() && isa<Argument>(Address))
6072 // Check unused arguments map.
6073 N = UnusedArgNodeMap[Address];
6074 SDDbgValue *SDV;
6075 if (N.getNode()) {
6076 if (const BitCastInst *BCI = dyn_cast<BitCastInst>(Address))
6077 Address = BCI->getOperand(0);
6078 // Parameters are handled specially.
6079 auto FINode = dyn_cast<FrameIndexSDNode>(N.getNode());
6080 if (isParameter && FINode) {
6081 // Byval parameter. We have a frame index at this point.
6082 SDV =
6083 DAG.getFrameIndexDbgValue(Variable, Expression, FINode->getIndex(),
6084 /*IsIndirect*/ true, dl, SDNodeOrder);
6085 } else if (isa<Argument>(Address)) {
6086 // Address is an argument, so try to emit its dbg value using
6087 // virtual register info from the FuncInfo.ValueMap.
6088 EmitFuncArgumentDbgValue(Address, Variable, Expression, dl, true, N);
6089 return;
6090 } else {
6091 SDV = DAG.getDbgValue(Variable, Expression, N.getNode(), N.getResNo(),
6092 true, dl, SDNodeOrder);
6093 }
6094 DAG.AddDbgValue(SDV, isParameter);
6095 } else {
6096 // If Address is an argument then try to emit its dbg value using
6097 // virtual register info from the FuncInfo.ValueMap.
6098 if (!EmitFuncArgumentDbgValue(Address, Variable, Expression, dl, true,
6099 N)) {
6100 LLVM_DEBUG(dbgs() << "Dropping debug info for " << DIdo { } while (false)
6101 << " (could not emit func-arg dbg_value)\n")do { } while (false);
6102 }
6103 }
6104 return;
6105 }
6106 case Intrinsic::dbg_label: {
6107 const DbgLabelInst &DI = cast<DbgLabelInst>(I);
6108 DILabel *Label = DI.getLabel();
6109 assert(Label && "Missing label")((void)0);
6110
6111 SDDbgLabel *SDV;
6112 SDV = DAG.getDbgLabel(Label, dl, SDNodeOrder);
6113 DAG.AddDbgLabel(SDV);
6114 return;
6115 }
6116 case Intrinsic::dbg_value: {
6117 const DbgValueInst &DI = cast<DbgValueInst>(I);
6118 assert(DI.getVariable() && "Missing variable")((void)0);
6119
6120 DILocalVariable *Variable = DI.getVariable();
6121 DIExpression *Expression = DI.getExpression();
6122 dropDanglingDebugInfo(Variable, Expression);
6123 SmallVector<Value *, 4> Values(DI.getValues());
6124 if (Values.empty())
6125 return;
6126
6127 if (std::count(Values.begin(), Values.end(), nullptr))
6128 return;
6129
6130 bool IsVariadic = DI.hasArgList();
6131 if (!handleDebugValue(Values, Variable, Expression, dl, DI.getDebugLoc(),
6132 SDNodeOrder, IsVariadic))
6133 addDanglingDebugInfo(&DI, dl, SDNodeOrder);
6134 return;
6135 }
6136
6137 case Intrinsic::eh_typeid_for: {
6138 // Find the type id for the given typeinfo.
6139 GlobalValue *GV = ExtractTypeInfo(I.getArgOperand(0));
6140 unsigned TypeID = DAG.getMachineFunction().getTypeIDFor(GV);
6141 Res = DAG.getConstant(TypeID, sdl, MVT::i32);
6142 setValue(&I, Res);
6143 return;
6144 }
6145
6146 case Intrinsic::eh_return_i32:
6147 case Intrinsic::eh_return_i64:
6148 DAG.getMachineFunction().setCallsEHReturn(true);
6149 DAG.setRoot(DAG.getNode(ISD::EH_RETURN, sdl,
6150 MVT::Other,
6151 getControlRoot(),
6152 getValue(I.getArgOperand(0)),
6153 getValue(I.getArgOperand(1))));
6154 return;
6155 case Intrinsic::eh_unwind_init:
6156 DAG.getMachineFunction().setCallsUnwindInit(true);
6157 return;
6158 case Intrinsic::eh_dwarf_cfa:
6159 setValue(&I, DAG.getNode(ISD::EH_DWARF_CFA, sdl,
6160 TLI.getPointerTy(DAG.getDataLayout()),
6161 getValue(I.getArgOperand(0))));
6162 return;
6163 case Intrinsic::eh_sjlj_callsite: {
6164 MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI();
6165 ConstantInt *CI = dyn_cast<ConstantInt>(I.getArgOperand(0));
6166 assert(CI && "Non-constant call site value in eh.sjlj.callsite!")((void)0);
6167 assert(MMI.getCurrentCallSite() == 0 && "Overlapping call sites!")((void)0);
6168
6169 MMI.setCurrentCallSite(CI->getZExtValue());
6170 return;
6171 }
6172 case Intrinsic::eh_sjlj_functioncontext: {
6173 // Get and store the index of the function context.
6174 MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
6175 AllocaInst *FnCtx =
6176 cast<AllocaInst>(I.getArgOperand(0)->stripPointerCasts());
6177 int FI = FuncInfo.StaticAllocaMap[FnCtx];
6178 MFI.setFunctionContextIndex(FI);
6179 return;
6180 }
6181 case Intrinsic::eh_sjlj_setjmp: {
6182 SDValue Ops[2];
6183 Ops[0] = getRoot();
6184 Ops[1] = getValue(I.getArgOperand(0));
6185 SDValue Op = DAG.getNode(ISD::EH_SJLJ_SETJMP, sdl,
6186 DAG.getVTList(MVT::i32, MVT::Other), Ops);
6187 setValue(&I, Op.getValue(0));
6188 DAG.setRoot(Op.getValue(1));
6189 return;
6190 }
6191 case Intrinsic::eh_sjlj_longjmp:
6192 DAG.setRoot(DAG.getNode(ISD::EH_SJLJ_LONGJMP, sdl, MVT::Other,
6193 getRoot(), getValue(I.getArgOperand(0))));
6194 return;
6195 case Intrinsic::eh_sjlj_setup_dispatch:
6196 DAG.setRoot(DAG.getNode(ISD::EH_SJLJ_SETUP_DISPATCH, sdl, MVT::Other,
6197 getRoot()));
6198 return;
6199 case Intrinsic::masked_gather:
6200 visitMaskedGather(I);
6201 return;
6202 case Intrinsic::masked_load:
6203 visitMaskedLoad(I);
6204 return;
6205 case Intrinsic::masked_scatter:
6206 visitMaskedScatter(I);
6207 return;
6208 case Intrinsic::masked_store:
6209 visitMaskedStore(I);
6210 return;
6211 case Intrinsic::masked_expandload:
6212 visitMaskedLoad(I, true /* IsExpanding */);
6213 return;
6214 case Intrinsic::masked_compressstore:
6215 visitMaskedStore(I, true /* IsCompressing */);
6216 return;
6217 case Intrinsic::powi:
6218 setValue(&I, ExpandPowI(sdl, getValue(I.getArgOperand(0)),
6219 getValue(I.getArgOperand(1)), DAG));
6220 return;
6221 case Intrinsic::log:
6222 setValue(&I, expandLog(sdl, getValue(I.getArgOperand(0)), DAG, TLI, Flags));
6223 return;
6224 case Intrinsic::log2:
6225 setValue(&I,
6226 expandLog2(sdl, getValue(I.getArgOperand(0)), DAG, TLI, Flags));
6227 return;
6228 case Intrinsic::log10:
6229 setValue(&I,
6230 expandLog10(sdl, getValue(I.getArgOperand(0)), DAG, TLI, Flags));
6231 return;
6232 case Intrinsic::exp:
6233 setValue(&I, expandExp(sdl, getValue(I.getArgOperand(0)), DAG, TLI, Flags));
6234 return;
6235 case Intrinsic::exp2:
6236 setValue(&I,
6237 expandExp2(sdl, getValue(I.getArgOperand(0)), DAG, TLI, Flags));
6238 return;
6239 case Intrinsic::pow:
6240 setValue(&I, expandPow(sdl, getValue(I.getArgOperand(0)),
6241 getValue(I.getArgOperand(1)), DAG, TLI, Flags));
6242 return;
6243 case Intrinsic::sqrt:
6244 case Intrinsic::fabs:
6245 case Intrinsic::sin:
6246 case Intrinsic::cos:
6247 case Intrinsic::floor:
6248 case Intrinsic::ceil:
6249 case Intrinsic::trunc:
6250 case Intrinsic::rint:
6251 case Intrinsic::nearbyint:
6252 case Intrinsic::round:
6253 case Intrinsic::roundeven:
6254 case Intrinsic::canonicalize: {
6255 unsigned Opcode;
6256 switch (Intrinsic) {
6257 default: llvm_unreachable("Impossible intrinsic")__builtin_unreachable(); // Can't reach here.
6258 case Intrinsic::sqrt: Opcode = ISD::FSQRT; break;
6259 case Intrinsic::fabs: Opcode = ISD::FABS; break;
6260 case Intrinsic::sin: Opcode = ISD::FSIN; break;
6261 case Intrinsic::cos: Opcode = ISD::FCOS; break;
6262 case Intrinsic::floor: Opcode = ISD::FFLOOR; break;
6263 case Intrinsic::ceil: Opcode = ISD::FCEIL; break;
6264 case Intrinsic::trunc: Opcode = ISD::FTRUNC; break;
6265 case Intrinsic::rint: Opcode = ISD::FRINT; break;
6266 case Intrinsic::nearbyint: Opcode = ISD::FNEARBYINT; break;
6267 case Intrinsic::round: Opcode = ISD::FROUND; break;
6268 case Intrinsic::roundeven: Opcode = ISD::FROUNDEVEN; break;
6269 case Intrinsic::canonicalize: Opcode = ISD::FCANONICALIZE; break;
6270 }
6271
6272 setValue(&I, DAG.getNode(Opcode, sdl,
6273 getValue(I.getArgOperand(0)).getValueType(),
6274 getValue(I.getArgOperand(0)), Flags));
6275 return;
6276 }
6277 case Intrinsic::lround:
6278 case Intrinsic::llround:
6279 case Intrinsic::lrint:
6280 case Intrinsic::llrint: {
6281 unsigned Opcode;
6282 switch (Intrinsic) {
6283 default: llvm_unreachable("Impossible intrinsic")__builtin_unreachable(); // Can't reach here.
6284 case Intrinsic::lround: Opcode = ISD::LROUND; break;
6285 case Intrinsic::llround: Opcode = ISD::LLROUND; break;
6286 case Intrinsic::lrint: Opcode = ISD::LRINT; break;
6287 case Intrinsic::llrint: Opcode = ISD::LLRINT; break;
6288 }
6289
6290 EVT RetVT = TLI.getValueType(DAG.getDataLayout(), I.getType());
6291 setValue(&I, DAG.getNode(Opcode, sdl, RetVT,
6292 getValue(I.getArgOperand(0))));
6293 return;
6294 }
6295 case Intrinsic::minnum:
6296 setValue(&I, DAG.getNode(ISD::FMINNUM, sdl,
6297 getValue(I.getArgOperand(0)).getValueType(),
6298 getValue(I.getArgOperand(0)),
6299 getValue(I.getArgOperand(1)), Flags));
6300 return;
6301 case Intrinsic::maxnum:
6302 setValue(&I, DAG.getNode(ISD::FMAXNUM, sdl,
6303 getValue(I.getArgOperand(0)).getValueType(),
6304 getValue(I.getArgOperand(0)),
6305 getValue(I.getArgOperand(1)), Flags));
6306 return;
6307 case Intrinsic::minimum:
6308 setValue(&I, DAG.getNode(ISD::FMINIMUM, sdl,
6309 getValue(I.getArgOperand(0)).getValueType(),
6310 getValue(I.getArgOperand(0)),
6311 getValue(I.getArgOperand(1)), Flags));
6312 return;
6313 case Intrinsic::maximum:
6314 setValue(&I, DAG.getNode(ISD::FMAXIMUM, sdl,
6315 getValue(I.getArgOperand(0)).getValueType(),
6316 getValue(I.getArgOperand(0)),
6317 getValue(I.getArgOperand(1)), Flags));
6318 return;
6319 case Intrinsic::copysign:
6320 setValue(&I, DAG.getNode(ISD::FCOPYSIGN, sdl,
6321 getValue(I.getArgOperand(0)).getValueType(),
6322 getValue(I.getArgOperand(0)),
6323 getValue(I.getArgOperand(1)), Flags));
6324 return;
6325 case Intrinsic::arithmetic_fence: {
6326 setValue(&I, DAG.getNode(ISD::ARITH_FENCE, sdl,
6327 getValue(I.getArgOperand(0)).getValueType(),
6328 getValue(I.getArgOperand(0)), Flags));
6329 return;
6330 }
6331 case Intrinsic::fma:
6332 setValue(&I, DAG.getNode(
6333 ISD::FMA, sdl, getValue(I.getArgOperand(0)).getValueType(),
6334 getValue(I.getArgOperand(0)), getValue(I.getArgOperand(1)),
6335 getValue(I.getArgOperand(2)), Flags));
6336 return;
6337#define INSTRUCTION(NAME, NARG, ROUND_MODE, INTRINSIC) \
6338 case Intrinsic::INTRINSIC:
6339#include "llvm/IR/ConstrainedOps.def"
6340 visitConstrainedFPIntrinsic(cast<ConstrainedFPIntrinsic>(I));
6341 return;
6342#define BEGIN_REGISTER_VP_INTRINSIC(VPID, ...) case Intrinsic::VPID:
6343#include "llvm/IR/VPIntrinsics.def"
6344 visitVectorPredicationIntrinsic(cast<VPIntrinsic>(I));
6345 return;
6346 case Intrinsic::fmuladd: {
6347 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
6348 if (TM.Options.AllowFPOpFusion != FPOpFusion::Strict &&
6349 TLI.isFMAFasterThanFMulAndFAdd(DAG.getMachineFunction(), VT)) {
6350 setValue(&I, DAG.getNode(ISD::FMA, sdl,
6351 getValue(I.getArgOperand(0)).getValueType(),
6352 getValue(I.getArgOperand(0)),
6353 getValue(I.getArgOperand(1)),
6354 getValue(I.getArgOperand(2)), Flags));
6355 } else {
6356 // TODO: Intrinsic calls should have fast-math-flags.
6357 SDValue Mul = DAG.getNode(
6358 ISD::FMUL, sdl, getValue(I.getArgOperand(0)).getValueType(),
6359 getValue(I.getArgOperand(0)), getValue(I.getArgOperand(1)), Flags);
6360 SDValue Add = DAG.getNode(ISD::FADD, sdl,
6361 getValue(I.getArgOperand(0)).getValueType(),
6362 Mul, getValue(I.getArgOperand(2)), Flags);
6363 setValue(&I, Add);
6364 }
6365 return;
6366 }
6367 case Intrinsic::convert_to_fp16:
6368 setValue(&I, DAG.getNode(ISD::BITCAST, sdl, MVT::i16,
6369 DAG.getNode(ISD::FP_ROUND, sdl, MVT::f16,
6370 getValue(I.getArgOperand(0)),
6371 DAG.getTargetConstant(0, sdl,
6372 MVT::i32))));
6373 return;
6374 case Intrinsic::convert_from_fp16:
6375 setValue(&I, DAG.getNode(ISD::FP_EXTEND, sdl,
6376 TLI.getValueType(DAG.getDataLayout(), I.getType()),
6377 DAG.getNode(ISD::BITCAST, sdl, MVT::f16,
6378 getValue(I.getArgOperand(0)))));
6379 return;
6380 case Intrinsic::fptosi_sat: {
6381 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
6382 setValue(&I, DAG.getNode(ISD::FP_TO_SINT_SAT, sdl, VT,
6383 getValue(I.getArgOperand(0)),
6384 DAG.getValueType(VT.getScalarType())));
6385 return;
6386 }
6387 case Intrinsic::fptoui_sat: {
6388 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
6389 setValue(&I, DAG.getNode(ISD::FP_TO_UINT_SAT, sdl, VT,
6390 getValue(I.getArgOperand(0)),
6391 DAG.getValueType(VT.getScalarType())));
6392 return;
6393 }
6394 case Intrinsic::set_rounding:
6395 Res = DAG.getNode(ISD::SET_ROUNDING, sdl, MVT::Other,
6396 {getRoot(), getValue(I.getArgOperand(0))});
6397 setValue(&I, Res);
6398 DAG.setRoot(Res.getValue(0));
6399 return;
6400 case Intrinsic::pcmarker: {
6401 SDValue Tmp = getValue(I.getArgOperand(0));
6402 DAG.setRoot(DAG.getNode(ISD::PCMARKER, sdl, MVT::Other, getRoot(), Tmp));
6403 return;
6404 }
6405 case Intrinsic::readcyclecounter: {
6406 SDValue Op = getRoot();
6407 Res = DAG.getNode(ISD::READCYCLECOUNTER, sdl,
6408 DAG.getVTList(MVT::i64, MVT::Other), Op);
6409 setValue(&I, Res);
6410 DAG.setRoot(Res.getValue(1));
6411 return;
6412 }
6413 case Intrinsic::bitreverse:
6414 setValue(&I, DAG.getNode(ISD::BITREVERSE, sdl,
6415 getValue(I.getArgOperand(0)).getValueType(),
6416 getValue(I.getArgOperand(0))));
6417 return;
6418 case Intrinsic::bswap:
6419 setValue(&I, DAG.getNode(ISD::BSWAP, sdl,
6420 getValue(I.getArgOperand(0)).getValueType(),
6421 getValue(I.getArgOperand(0))));
6422 return;
6423 case Intrinsic::cttz: {
6424 SDValue Arg = getValue(I.getArgOperand(0));
6425 ConstantInt *CI = cast<ConstantInt>(I.getArgOperand(1));
6426 EVT Ty = Arg.getValueType();
6427 setValue(&I, DAG.getNode(CI->isZero() ? ISD::CTTZ : ISD::CTTZ_ZERO_UNDEF,
6428 sdl, Ty, Arg));
6429 return;
6430 }
6431 case Intrinsic::ctlz: {
6432 SDValue Arg = getValue(I.getArgOperand(0));
6433 ConstantInt *CI = cast<ConstantInt>(I.getArgOperand(1));
6434 EVT Ty = Arg.getValueType();
6435 setValue(&I, DAG.getNode(CI->isZero() ? ISD::CTLZ : ISD::CTLZ_ZERO_UNDEF,
6436 sdl, Ty, Arg));
6437 return;
6438 }
6439 case Intrinsic::ctpop: {
6440 SDValue Arg = getValue(I.getArgOperand(0));
6441 EVT Ty = Arg.getValueType();
6442 setValue(&I, DAG.getNode(ISD::CTPOP, sdl, Ty, Arg));
6443 return;
6444 }
6445 case Intrinsic::fshl:
6446 case Intrinsic::fshr: {
6447 bool IsFSHL = Intrinsic == Intrinsic::fshl;
6448 SDValue X = getValue(I.getArgOperand(0));
6449 SDValue Y = getValue(I.getArgOperand(1));
6450 SDValue Z = getValue(I.getArgOperand(2));
6451 EVT VT = X.getValueType();
6452
6453 if (X == Y) {
6454 auto RotateOpcode = IsFSHL ? ISD::ROTL : ISD::ROTR;
6455 setValue(&I, DAG.getNode(RotateOpcode, sdl, VT, X, Z));
6456 } else {
6457 auto FunnelOpcode = IsFSHL ? ISD::FSHL : ISD::FSHR;
6458 setValue(&I, DAG.getNode(FunnelOpcode, sdl, VT, X, Y, Z));
6459 }
6460 return;
6461 }
6462 case Intrinsic::sadd_sat: {
6463 SDValue Op1 = getValue(I.getArgOperand(0));
6464 SDValue Op2 = getValue(I.getArgOperand(1));
6465 setValue(&I, DAG.getNode(ISD::SADDSAT, sdl, Op1.getValueType(), Op1, Op2));
6466 return;
6467 }
6468 case Intrinsic::uadd_sat: {
6469 SDValue Op1 = getValue(I.getArgOperand(0));
6470 SDValue Op2 = getValue(I.getArgOperand(1));
6471 setValue(&I, DAG.getNode(ISD::UADDSAT, sdl, Op1.getValueType(), Op1, Op2));
6472 return;
6473 }
6474 case Intrinsic::ssub_sat: {
6475 SDValue Op1 = getValue(I.getArgOperand(0));
6476 SDValue Op2 = getValue(I.getArgOperand(1));
6477 setValue(&I, DAG.getNode(ISD::SSUBSAT, sdl, Op1.getValueType(), Op1, Op2));
6478 return;
6479 }
6480 case Intrinsic::usub_sat: {
6481 SDValue Op1 = getValue(I.getArgOperand(0));
6482 SDValue Op2 = getValue(I.getArgOperand(1));
6483 setValue(&I, DAG.getNode(ISD::USUBSAT, sdl, Op1.getValueType(), Op1, Op2));
6484 return;
6485 }
6486 case Intrinsic::sshl_sat: {
6487 SDValue Op1 = getValue(I.getArgOperand(0));
6488 SDValue Op2 = getValue(I.getArgOperand(1));
6489 setValue(&I, DAG.getNode(ISD::SSHLSAT, sdl, Op1.getValueType(), Op1, Op2));
6490 return;
6491 }
6492 case Intrinsic::ushl_sat: {
6493 SDValue Op1 = getValue(I.getArgOperand(0));
6494 SDValue Op2 = getValue(I.getArgOperand(1));
6495 setValue(&I, DAG.getNode(ISD::USHLSAT, sdl, Op1.getValueType(), Op1, Op2));
6496 return;
6497 }
6498 case Intrinsic::smul_fix:
6499 case Intrinsic::umul_fix:
6500 case Intrinsic::smul_fix_sat:
6501 case Intrinsic::umul_fix_sat: {
6502 SDValue Op1 = getValue(I.getArgOperand(0));
6503 SDValue Op2 = getValue(I.getArgOperand(1));
6504 SDValue Op3 = getValue(I.getArgOperand(2));
6505 setValue(&I, DAG.getNode(FixedPointIntrinsicToOpcode(Intrinsic), sdl,
6506 Op1.getValueType(), Op1, Op2, Op3));
6507 return;
6508 }
6509 case Intrinsic::sdiv_fix:
6510 case Intrinsic::udiv_fix:
6511 case Intrinsic::sdiv_fix_sat:
6512 case Intrinsic::udiv_fix_sat: {
6513 SDValue Op1 = getValue(I.getArgOperand(0));
6514 SDValue Op2 = getValue(I.getArgOperand(1));
6515 SDValue Op3 = getValue(I.getArgOperand(2));
6516 setValue(&I, expandDivFix(FixedPointIntrinsicToOpcode(Intrinsic), sdl,
6517 Op1, Op2, Op3, DAG, TLI));
6518 return;
6519 }
6520 case Intrinsic::smax: {
6521 SDValue Op1 = getValue(I.getArgOperand(0));
6522 SDValue Op2 = getValue(I.getArgOperand(1));
6523 setValue(&I, DAG.getNode(ISD::SMAX, sdl, Op1.getValueType(), Op1, Op2));
6524 return;
6525 }
6526 case Intrinsic::smin: {
6527 SDValue Op1 = getValue(I.getArgOperand(0));
6528 SDValue Op2 = getValue(I.getArgOperand(1));
6529 setValue(&I, DAG.getNode(ISD::SMIN, sdl, Op1.getValueType(), Op1, Op2));
6530 return;
6531 }
6532 case Intrinsic::umax: {
6533 SDValue Op1 = getValue(I.getArgOperand(0));
6534 SDValue Op2 = getValue(I.getArgOperand(1));
6535 setValue(&I, DAG.getNode(ISD::UMAX, sdl, Op1.getValueType(), Op1, Op2));
6536 return;
6537 }
6538 case Intrinsic::umin: {
6539 SDValue Op1 = getValue(I.getArgOperand(0));
6540 SDValue Op2 = getValue(I.getArgOperand(1));
6541 setValue(&I, DAG.getNode(ISD::UMIN, sdl, Op1.getValueType(), Op1, Op2));
6542 return;
6543 }
6544 case Intrinsic::abs: {
6545 // TODO: Preserve "int min is poison" arg in SDAG?
6546 SDValue Op1 = getValue(I.getArgOperand(0));
6547 setValue(&I, DAG.getNode(ISD::ABS, sdl, Op1.getValueType(), Op1));
6548 return;
6549 }
6550 case Intrinsic::stacksave: {
6551 SDValue Op = getRoot();
6552 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
6553 Res = DAG.getNode(ISD::STACKSAVE, sdl, DAG.getVTList(VT, MVT::Other), Op);
6554 setValue(&I, Res);
6555 DAG.setRoot(Res.getValue(1));
6556 return;
6557 }
6558 case Intrinsic::stackrestore:
6559 Res = getValue(I.getArgOperand(0));
6560 DAG.setRoot(DAG.getNode(ISD::STACKRESTORE, sdl, MVT::Other, getRoot(), Res));
6561 return;
6562 case Intrinsic::get_dynamic_area_offset: {
6563 SDValue Op = getRoot();
6564 EVT PtrTy = TLI.getFrameIndexTy(DAG.getDataLayout());
6565 EVT ResTy = TLI.getValueType(DAG.getDataLayout(), I.getType());
6566 // Result type for @llvm.get.dynamic.area.offset should match PtrTy for
6567 // target.
6568 if (PtrTy.getFixedSizeInBits() < ResTy.getFixedSizeInBits())
6569 report_fatal_error("Wrong result type for @llvm.get.dynamic.area.offset"
6570 " intrinsic!");
6571 Res = DAG.getNode(ISD::GET_DYNAMIC_AREA_OFFSET, sdl, DAG.getVTList(ResTy),
6572 Op);
6573 DAG.setRoot(Op);
6574 setValue(&I, Res);
6575 return;
6576 }
6577 case Intrinsic::stackguard: {
6578 MachineFunction &MF = DAG.getMachineFunction();
6579 const Module &M = *MF.getFunction().getParent();
6580 SDValue Chain = getRoot();
6581 if (TLI.useLoadStackGuardNode()) {
6582 Res = getLoadStackGuard(DAG, sdl, Chain);
6583 } else {
6584 EVT PtrTy = TLI.getValueType(DAG.getDataLayout(), I.getType());
6585 const Value *Global = TLI.getSDagStackGuard(M);
6586 Align Align = DL->getPrefTypeAlign(Global->getType());
6587 Res = DAG.getLoad(PtrTy, sdl, Chain, getValue(Global),
6588 MachinePointerInfo(Global, 0), Align,
6589 MachineMemOperand::MOVolatile);
6590 }
6591 if (TLI.useStackGuardXorFP())
6592 Res = TLI.emitStackGuardXorFP(DAG, Res, sdl);
6593 DAG.setRoot(Chain);
6594 setValue(&I, Res);
6595 return;
6596 }
6597 case Intrinsic::stackprotector: {
6598 // Emit code into the DAG to store the stack guard onto the stack.
6599 MachineFunction &MF = DAG.getMachineFunction();
6600 MachineFrameInfo &MFI = MF.getFrameInfo();
6601 SDValue Src, Chain = getRoot();
6602
6603 if (TLI.useLoadStackGuardNode())
6604 Src = getLoadStackGuard(DAG, sdl, Chain);
6605 else
6606 Src = getValue(I.getArgOperand(0)); // The guard's value.
6607
6608 AllocaInst *Slot = cast<AllocaInst>(I.getArgOperand(1));
6609
6610 int FI = FuncInfo.StaticAllocaMap[Slot];
6611 MFI.setStackProtectorIndex(FI);
6612 EVT PtrTy = TLI.getFrameIndexTy(DAG.getDataLayout());
6613
6614 SDValue FIN = DAG.getFrameIndex(FI, PtrTy);
6615
6616 // Store the stack protector onto the stack.
6617 Res = DAG.getStore(
6618 Chain, sdl, Src, FIN,
6619 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI),
6620 MaybeAlign(), MachineMemOperand::MOVolatile);
6621 setValue(&I, Res);
6622 DAG.setRoot(Res);
6623 return;
6624 }
6625 case Intrinsic::objectsize:
6626 llvm_unreachable("llvm.objectsize.* should have been lowered already")__builtin_unreachable();
6627
6628 case Intrinsic::is_constant:
6629 llvm_unreachable("llvm.is.constant.* should have been lowered already")__builtin_unreachable();
6630
6631 case Intrinsic::annotation:
6632 case Intrinsic::ptr_annotation:
6633 case Intrinsic::launder_invariant_group:
6634 case Intrinsic::strip_invariant_group:
6635 // Drop the intrinsic, but forward the value
6636 setValue(&I, getValue(I.getOperand(0)));
6637 return;
6638
6639 case Intrinsic::assume:
6640 case Intrinsic::experimental_noalias_scope_decl:
6641 case Intrinsic::var_annotation:
6642 case Intrinsic::sideeffect:
6643 // Discard annotate attributes, noalias scope declarations, assumptions, and
6644 // artificial side-effects.
6645 return;
6646
6647 case Intrinsic::codeview_annotation: {
6648 // Emit a label associated with this metadata.
6649 MachineFunction &MF = DAG.getMachineFunction();
6650 MCSymbol *Label =
6651 MF.getMMI().getContext().createTempSymbol("annotation", true);
6652 Metadata *MD = cast<MetadataAsValue>(I.getArgOperand(0))->getMetadata();
6653 MF.addCodeViewAnnotation(Label, cast<MDNode>(MD));
6654 Res = DAG.getLabelNode(ISD::ANNOTATION_LABEL, sdl, getRoot(), Label);
6655 DAG.setRoot(Res);
6656 return;
6657 }
6658
6659 case Intrinsic::init_trampoline: {
6660 const Function *F = cast<Function>(I.getArgOperand(1)->stripPointerCasts());
6661
6662 SDValue Ops[6];
6663 Ops[0] = getRoot();
6664 Ops[1] = getValue(I.getArgOperand(0));
6665 Ops[2] = getValue(I.getArgOperand(1));
6666 Ops[3] = getValue(I.getArgOperand(2));
6667 Ops[4] = DAG.getSrcValue(I.getArgOperand(0));
6668 Ops[5] = DAG.getSrcValue(F);
6669
6670 Res = DAG.getNode(ISD::INIT_TRAMPOLINE, sdl, MVT::Other, Ops);
6671
6672 DAG.setRoot(Res);
6673 return;
6674 }
6675 case Intrinsic::adjust_trampoline:
6676 setValue(&I, DAG.getNode(ISD::ADJUST_TRAMPOLINE, sdl,
6677 TLI.getPointerTy(DAG.getDataLayout()),
6678 getValue(I.getArgOperand(0))));
6679 return;
6680 case Intrinsic::gcroot: {
6681 assert(DAG.getMachineFunction().getFunction().hasGC() &&((void)0)
6682 "only valid in functions with gc specified, enforced by Verifier")((void)0);
6683 assert(GFI && "implied by previous")((void)0);
6684 const Value *Alloca = I.getArgOperand(0)->stripPointerCasts();
6685 const Constant *TypeMap = cast<Constant>(I.getArgOperand(1));
6686
6687 FrameIndexSDNode *FI = cast<FrameIndexSDNode>(getValue(Alloca).getNode());
6688 GFI->addStackRoot(FI->getIndex(), TypeMap);
6689 return;
6690 }
6691 case Intrinsic::gcread:
6692 case Intrinsic::gcwrite:
6693 llvm_unreachable("GC failed to lower gcread/gcwrite intrinsics!")__builtin_unreachable();
6694 case Intrinsic::flt_rounds:
6695 Res = DAG.getNode(ISD::FLT_ROUNDS_, sdl, {MVT::i32, MVT::Other}, getRoot());
6696 setValue(&I, Res);
6697 DAG.setRoot(Res.getValue(1));
6698 return;
6699
6700 case Intrinsic::expect:
6701 // Just replace __builtin_expect(exp, c) with EXP.
6702 setValue(&I, getValue(I.getArgOperand(0)));
6703 return;
6704
6705 case Intrinsic::ubsantrap:
6706 case Intrinsic::debugtrap:
6707 case Intrinsic::trap: {
6708 StringRef TrapFuncName =
6709 I.getAttributes()
6710 .getAttribute(AttributeList::FunctionIndex, "trap-func-name")
6711 .getValueAsString();
6712 if (TrapFuncName.empty()) {
6713 switch (Intrinsic) {
6714 case Intrinsic::trap:
6715 DAG.setRoot(DAG.getNode(ISD::TRAP, sdl, MVT::Other, getRoot()));
6716 break;
6717 case Intrinsic::debugtrap:
6718 DAG.setRoot(DAG.getNode(ISD::DEBUGTRAP, sdl, MVT::Other, getRoot()));
6719 break;
6720 case Intrinsic::ubsantrap:
6721 DAG.setRoot(DAG.getNode(
6722 ISD::UBSANTRAP, sdl, MVT::Other, getRoot(),
6723 DAG.getTargetConstant(
6724 cast<ConstantInt>(I.getArgOperand(0))->getZExtValue(), sdl,
6725 MVT::i32)));
6726 break;
6727 default: llvm_unreachable("unknown trap intrinsic")__builtin_unreachable();
6728 }
6729 return;
6730 }
6731 TargetLowering::ArgListTy Args;
6732 if (Intrinsic == Intrinsic::ubsantrap) {
6733 Args.push_back(TargetLoweringBase::ArgListEntry());
6734 Args[0].Val = I.getArgOperand(0);
6735 Args[0].Node = getValue(Args[0].Val);
6736 Args[0].Ty = Args[0].Val->getType();
6737 }
6738
6739 TargetLowering::CallLoweringInfo CLI(DAG);
6740 CLI.setDebugLoc(sdl).setChain(getRoot()).setLibCallee(
6741 CallingConv::C, I.getType(),
6742 DAG.getExternalSymbol(TrapFuncName.data(),
6743 TLI.getPointerTy(DAG.getDataLayout())),
6744 std::move(Args));
6745
6746 std::pair<SDValue, SDValue> Result = TLI.LowerCallTo(CLI);
6747 DAG.setRoot(Result.second);
6748 return;
6749 }
6750
6751 case Intrinsic::uadd_with_overflow:
6752 case Intrinsic::sadd_with_overflow:
6753 case Intrinsic::usub_with_overflow:
6754 case Intrinsic::ssub_with_overflow:
6755 case Intrinsic::umul_with_overflow:
6756 case Intrinsic::smul_with_overflow: {
6757 ISD::NodeType Op;
6758 switch (Intrinsic) {
6759 default: llvm_unreachable("Impossible intrinsic")__builtin_unreachable(); // Can't reach here.
6760 case Intrinsic::uadd_with_overflow: Op = ISD::UADDO; break;
6761 case Intrinsic::sadd_with_overflow: Op = ISD::SADDO; break;
6762 case Intrinsic::usub_with_overflow: Op = ISD::USUBO; break;
6763 case Intrinsic::ssub_with_overflow: Op = ISD::SSUBO; break;
6764 case Intrinsic::umul_with_overflow: Op = ISD::UMULO; break;
6765 case Intrinsic::smul_with_overflow: Op = ISD::SMULO; break;
6766 }
6767 SDValue Op1 = getValue(I.getArgOperand(0));
6768 SDValue Op2 = getValue(I.getArgOperand(1));
6769
6770 EVT ResultVT = Op1.getValueType();
6771 EVT OverflowVT = MVT::i1;
6772 if (ResultVT.isVector())
6773 OverflowVT = EVT::getVectorVT(
6774 *Context, OverflowVT, ResultVT.getVectorElementCount());
6775
6776 SDVTList VTs = DAG.getVTList(ResultVT, OverflowVT);
6777 setValue(&I, DAG.getNode(Op, sdl, VTs, Op1, Op2));
6778 return;
6779 }
6780 case Intrinsic::prefetch: {
6781 SDValue Ops[5];
6782 unsigned rw = cast<ConstantInt>(I.getArgOperand(1))->getZExtValue();
6783 auto Flags = rw == 0 ? MachineMemOperand::MOLoad :MachineMemOperand::MOStore;
6784 Ops[0] = DAG.getRoot();
6785 Ops[1] = getValue(I.getArgOperand(0));
6786 Ops[2] = getValue(I.getArgOperand(1));
6787 Ops[3] = getValue(I.getArgOperand(2));
6788 Ops[4] = getValue(I.getArgOperand(3));
6789 SDValue Result = DAG.getMemIntrinsicNode(
6790 ISD::PREFETCH, sdl, DAG.getVTList(MVT::Other), Ops,
6791 EVT::getIntegerVT(*Context, 8), MachinePointerInfo(I.getArgOperand(0)),
6792 /* align */ None, Flags);
6793
6794 // Chain the prefetch in parallell with any pending loads, to stay out of
6795 // the way of later optimizations.
6796 PendingLoads.push_back(Result);
6797 Result = getRoot();
6798 DAG.setRoot(Result);
6799 return;
6800 }
6801 case Intrinsic::lifetime_start:
6802 case Intrinsic::lifetime_end: {
6803 bool IsStart = (Intrinsic == Intrinsic::lifetime_start);
6804 // Stack coloring is not enabled in O0, discard region information.
6805 if (TM.getOptLevel() == CodeGenOpt::None)
6806 return;
6807
6808 const int64_t ObjectSize =
6809 cast<ConstantInt>(I.getArgOperand(0))->getSExtValue();
6810 Value *const ObjectPtr = I.getArgOperand(1);
6811 SmallVector<const Value *, 4> Allocas;
6812 getUnderlyingObjects(ObjectPtr, Allocas);
6813
6814 for (const Value *Alloca : Allocas) {
6815 const AllocaInst *LifetimeObject = dyn_cast_or_null<AllocaInst>(Alloca);
6816
6817 // Could not find an Alloca.
6818 if (!LifetimeObject)
6819 continue;
6820
6821 // First check that the Alloca is static, otherwise it won't have a
6822 // valid frame index.
6823 auto SI = FuncInfo.StaticAllocaMap.find(LifetimeObject);
6824 if (SI == FuncInfo.StaticAllocaMap.end())
6825 return;
6826
6827 const int FrameIndex = SI->second;
6828 int64_t Offset;
6829 if (GetPointerBaseWithConstantOffset(
6830 ObjectPtr, Offset, DAG.getDataLayout()) != LifetimeObject)
6831 Offset = -1; // Cannot determine offset from alloca to lifetime object.
6832 Res = DAG.getLifetimeNode(IsStart, sdl, getRoot(), FrameIndex, ObjectSize,
6833 Offset);
6834 DAG.setRoot(Res);
6835 }
6836 return;
6837 }
6838 case Intrinsic::pseudoprobe: {
6839 auto Guid = cast<ConstantInt>(I.getArgOperand(0))->getZExtValue();
6840 auto Index = cast<ConstantInt>(I.getArgOperand(1))->getZExtValue();
6841 auto Attr = cast<ConstantInt>(I.getArgOperand(2))->getZExtValue();
6842 Res = DAG.getPseudoProbeNode(sdl, getRoot(), Guid, Index, Attr);
6843 DAG.setRoot(Res);
6844 return;
6845 }
6846 case Intrinsic::invariant_start:
6847 // Discard region information.
6848 setValue(&I, DAG.getUNDEF(TLI.getPointerTy(DAG.getDataLayout())));
6849 return;
6850 case Intrinsic::invariant_end:
6851 // Discard region information.
6852 return;
6853 case Intrinsic::clear_cache:
6854 /// FunctionName may be null.
6855 if (const char *FunctionName = TLI.getClearCacheBuiltinName())
6856 lowerCallToExternalSymbol(I, FunctionName);
6857 return;
6858 case Intrinsic::donothing:
6859 case Intrinsic::seh_try_begin:
6860 case Intrinsic::seh_scope_begin:
6861 case Intrinsic::seh_try_end:
6862 case Intrinsic::seh_scope_end:
6863 // ignore
6864 return;
6865 case Intrinsic::experimental_stackmap:
6866 visitStackmap(I);
6867 return;
6868 case Intrinsic::experimental_patchpoint_void:
6869 case Intrinsic::experimental_patchpoint_i64:
6870 visitPatchpoint(I);
6871 return;
6872 case Intrinsic::experimental_gc_statepoint:
6873 LowerStatepoint(cast<GCStatepointInst>(I));
6874 return;
6875 case Intrinsic::experimental_gc_result:
6876 visitGCResult(cast<GCResultInst>(I));
6877 return;
6878 case Intrinsic::experimental_gc_relocate:
6879 visitGCRelocate(cast<GCRelocateInst>(I));
6880 return;
6881 case Intrinsic::instrprof_increment:
6882 llvm_unreachable("instrprof failed to lower an increment")__builtin_unreachable();
6883 case Intrinsic::instrprof_value_profile:
6884 llvm_unreachable("instrprof failed to lower a value profiling call")__builtin_unreachable();
6885 case Intrinsic::localescape: {
6886 MachineFunction &MF = DAG.getMachineFunction();
6887 const TargetInstrInfo *TII = DAG.getSubtarget().getInstrInfo();
6888
6889 // Directly emit some LOCAL_ESCAPE machine instrs. Label assignment emission
6890 // is the same on all targets.
6891 for (unsigned Idx = 0, E = I.getNumArgOperands(); Idx < E; ++Idx) {
6892 Value *Arg = I.getArgOperand(Idx)->stripPointerCasts();
6893 if (isa<ConstantPointerNull>(Arg))
6894 continue; // Skip null pointers. They represent a hole in index space.
6895 AllocaInst *Slot = cast<AllocaInst>(Arg);
6896 assert(FuncInfo.StaticAllocaMap.count(Slot) &&((void)0)
6897 "can only escape static allocas")((void)0);
6898 int FI = FuncInfo.StaticAllocaMap[Slot];
6899 MCSymbol *FrameAllocSym =
6900 MF.getMMI().getContext().getOrCreateFrameAllocSymbol(
6901 GlobalValue::dropLLVMManglingEscape(MF.getName()), Idx);
6902 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, dl,
6903 TII->get(TargetOpcode::LOCAL_ESCAPE))
6904 .addSym(FrameAllocSym)
6905 .addFrameIndex(FI);
6906 }
6907
6908 return;
6909 }
6910
6911 case Intrinsic::localrecover: {
6912 // i8* @llvm.localrecover(i8* %fn, i8* %fp, i32 %idx)
6913 MachineFunction &MF = DAG.getMachineFunction();
6914
6915 // Get the symbol that defines the frame offset.
6916 auto *Fn = cast<Function>(I.getArgOperand(0)->stripPointerCasts());
6917 auto *Idx = cast<ConstantInt>(I.getArgOperand(2));
6918 unsigned IdxVal =
6919 unsigned(Idx->getLimitedValue(std::numeric_limits<int>::max()));
6920 MCSymbol *FrameAllocSym =
6921 MF.getMMI().getContext().getOrCreateFrameAllocSymbol(
6922 GlobalValue::dropLLVMManglingEscape(Fn->getName()), IdxVal);
6923
6924 Value *FP = I.getArgOperand(1);
6925 SDValue FPVal = getValue(FP);
6926 EVT PtrVT = FPVal.getValueType();
6927
6928 // Create a MCSymbol for the label to avoid any target lowering
6929 // that would make this PC relative.
6930 SDValue OffsetSym = DAG.getMCSymbol(FrameAllocSym, PtrVT);
6931 SDValue OffsetVal =
6932 DAG.getNode(ISD::LOCAL_RECOVER, sdl, PtrVT, OffsetSym);
6933
6934 // Add the offset to the FP.
6935 SDValue Add = DAG.getMemBasePlusOffset(FPVal, OffsetVal, sdl);
6936 setValue(&I, Add);
6937
6938 return;
6939 }
6940
6941 case Intrinsic::eh_exceptionpointer:
6942 case Intrinsic::eh_exceptioncode: {
6943 // Get the exception pointer vreg, copy from it, and resize it to fit.
6944 const auto *CPI = cast<CatchPadInst>(I.getArgOperand(0));
6945 MVT PtrVT = TLI.getPointerTy(DAG.getDataLayout());
6946 const TargetRegisterClass *PtrRC = TLI.getRegClassFor(PtrVT);
6947 unsigned VReg = FuncInfo.getCatchPadExceptionPointerVReg(CPI, PtrRC);
6948 SDValue N =
6949 DAG.getCopyFromReg(DAG.getEntryNode(), getCurSDLoc(), VReg, PtrVT);
6950 if (Intrinsic == Intrinsic::eh_exceptioncode)
6951 N = DAG.getZExtOrTrunc(N, getCurSDLoc(), MVT::i32);
6952 setValue(&I, N);
6953 return;
6954 }
6955 case Intrinsic::xray_customevent: {
6956 // Here we want to make sure that the intrinsic behaves as if it has a
6957 // specific calling convention, and only for x86_64.
6958 // FIXME: Support other platforms later.
6959 const auto &Triple = DAG.getTarget().getTargetTriple();
6960 if (Triple.getArch() != Triple::x86_64)
6961 return;
6962
6963 SDLoc DL = getCurSDLoc();
6964 SmallVector<SDValue, 8> Ops;
6965
6966 // We want to say that we always want the arguments in registers.
6967 SDValue LogEntryVal = getValue(I.getArgOperand(0));
6968 SDValue StrSizeVal = getValue(I.getArgOperand(1));
6969 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
6970 SDValue Chain = getRoot();
6971 Ops.push_back(LogEntryVal);
6972 Ops.push_back(StrSizeVal);
6973 Ops.push_back(Chain);
6974
6975 // We need to enforce the calling convention for the callsite, so that
6976 // argument ordering is enforced correctly, and that register allocation can
6977 // see that some registers may be assumed clobbered and have to preserve
6978 // them across calls to the intrinsic.
6979 MachineSDNode *MN = DAG.getMachineNode(TargetOpcode::PATCHABLE_EVENT_CALL,
6980 DL, NodeTys, Ops);
6981 SDValue patchableNode = SDValue(MN, 0);
6982 DAG.setRoot(patchableNode);
6983 setValue(&I, patchableNode);
6984 return;
6985 }
6986 case Intrinsic::xray_typedevent: {
6987 // Here we want to make sure that the intrinsic behaves as if it has a
6988 // specific calling convention, and only for x86_64.
6989 // FIXME: Support other platforms later.
6990 const auto &Triple = DAG.getTarget().getTargetTriple();
6991 if (Triple.getArch() != Triple::x86_64)
6992 return;
6993
6994 SDLoc DL = getCurSDLoc();
6995 SmallVector<SDValue, 8> Ops;
6996
6997 // We want to say that we always want the arguments in registers.
6998 // It's unclear to me how manipulating the selection DAG here forces callers
6999 // to provide arguments in registers instead of on the stack.
7000 SDValue LogTypeId = getValue(I.getArgOperand(0));
7001 SDValue LogEntryVal = getValue(I.getArgOperand(1));
7002 SDValue StrSizeVal = getValue(I.getArgOperand(2));
7003 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
7004 SDValue Chain = getRoot();
7005 Ops.push_back(LogTypeId);
7006 Ops.push_back(LogEntryVal);
7007 Ops.push_back(StrSizeVal);
7008 Ops.push_back(Chain);
7009
7010 // We need to enforce the calling convention for the callsite, so that
7011 // argument ordering is enforced correctly, and that register allocation can
7012 // see that some registers may be assumed clobbered and have to preserve
7013 // them across calls to the intrinsic.
7014 MachineSDNode *MN = DAG.getMachineNode(
7015 TargetOpcode::PATCHABLE_TYPED_EVENT_CALL, DL, NodeTys, Ops);
7016 SDValue patchableNode = SDValue(MN, 0);
7017 DAG.setRoot(patchableNode);
7018 setValue(&I, patchableNode);
7019 return;
7020 }
7021 case Intrinsic::experimental_deoptimize:
7022 LowerDeoptimizeCall(&I);
7023 return;
7024 case Intrinsic::experimental_stepvector:
7025 visitStepVector(I);
7026 return;
7027 case Intrinsic::vector_reduce_fadd:
7028 case Intrinsic::vector_reduce_fmul:
7029 case Intrinsic::vector_reduce_add:
7030 case Intrinsic::vector_reduce_mul:
7031 case Intrinsic::vector_reduce_and:
7032 case Intrinsic::vector_reduce_or:
7033 case Intrinsic::vector_reduce_xor:
7034 case Intrinsic::vector_reduce_smax:
7035 case Intrinsic::vector_reduce_smin:
7036 case Intrinsic::vector_reduce_umax:
7037 case Intrinsic::vector_reduce_umin:
7038 case Intrinsic::vector_reduce_fmax:
7039 case Intrinsic::vector_reduce_fmin:
7040 visitVectorReduce(I, Intrinsic);
7041 return;
7042
7043 case Intrinsic::icall_branch_funnel: {
7044 SmallVector<SDValue, 16> Ops;
7045 Ops.push_back(getValue(I.getArgOperand(0)));
7046
7047 int64_t Offset;
7048 auto *Base = dyn_cast<GlobalObject>(GetPointerBaseWithConstantOffset(
7049 I.getArgOperand(1), Offset, DAG.getDataLayout()));
7050 if (!Base)
7051 report_fatal_error(
7052 "llvm.icall.branch.funnel operand must be a GlobalValue");
7053 Ops.push_back(DAG.getTargetGlobalAddress(Base, getCurSDLoc(), MVT::i64, 0));
7054
7055 struct BranchFunnelTarget {
7056 int64_t Offset;
7057 SDValue Target;
7058 };
7059 SmallVector<BranchFunnelTarget, 8> Targets;
7060
7061 for (unsigned Op = 1, N = I.getNumArgOperands(); Op != N; Op += 2) {
7062 auto *ElemBase = dyn_cast<GlobalObject>(GetPointerBaseWithConstantOffset(
7063 I.getArgOperand(Op), Offset, DAG.getDataLayout()));
7064 if (ElemBase != Base)
7065 report_fatal_error("all llvm.icall.branch.funnel operands must refer "
7066 "to the same GlobalValue");
7067
7068 SDValue Val = getValue(I.getArgOperand(Op + 1));
7069 auto *GA = dyn_cast<GlobalAddressSDNode>(Val);
7070 if (!GA)
7071 report_fatal_error(
7072 "llvm.icall.branch.funnel operand must be a GlobalValue");
7073 Targets.push_back({Offset, DAG.getTargetGlobalAddress(
7074 GA->getGlobal(), getCurSDLoc(),
7075 Val.getValueType(), GA->getOffset())});
7076 }
7077 llvm::sort(Targets,
7078 [](const BranchFunnelTarget &T1, const BranchFunnelTarget &T2) {
7079 return T1.Offset < T2.Offset;
7080 });
7081
7082 for (auto &T : Targets) {
7083 Ops.push_back(DAG.getTargetConstant(T.Offset, getCurSDLoc(), MVT::i32));
7084 Ops.push_back(T.Target);
7085 }
7086
7087 Ops.push_back(DAG.getRoot()); // Chain
7088 SDValue N(DAG.getMachineNode(TargetOpcode::ICALL_BRANCH_FUNNEL,
7089 getCurSDLoc(), MVT::Other, Ops),
7090 0);
7091 DAG.setRoot(N);
7092 setValue(&I, N);
7093 HasTailCall = true;
7094 return;
7095 }
7096
7097 case Intrinsic::wasm_landingpad_index:
7098 // Information this intrinsic contained has been transferred to
7099 // MachineFunction in SelectionDAGISel::PrepareEHLandingPad. We can safely
7100 // delete it now.
7101 return;
7102
7103 case Intrinsic::aarch64_settag:
7104 case Intrinsic::aarch64_settag_zero: {
7105 const SelectionDAGTargetInfo &TSI = DAG.getSelectionDAGInfo();
7106 bool ZeroMemory = Intrinsic == Intrinsic::aarch64_settag_zero;
7107 SDValue Val = TSI.EmitTargetCodeForSetTag(
7108 DAG, getCurSDLoc(), getRoot(), getValue(I.getArgOperand(0)),
7109 getValue(I.getArgOperand(1)), MachinePointerInfo(I.getArgOperand(0)),
7110 ZeroMemory);
7111 DAG.setRoot(Val);
7112 setValue(&I, Val);
7113 return;
7114 }
7115 case Intrinsic::ptrmask: {
7116 SDValue Ptr = getValue(I.getOperand(0));
7117 SDValue Const = getValue(I.getOperand(1));
7118
7119 EVT PtrVT = Ptr.getValueType();
7120 setValue(&I, DAG.getNode(ISD::AND, getCurSDLoc(), PtrVT, Ptr,
7121 DAG.getZExtOrTrunc(Const, getCurSDLoc(), PtrVT)));
7122 return;
7123 }
7124 case Intrinsic::get_active_lane_mask: {
7125 auto DL = getCurSDLoc();
7126 SDValue Index = getValue(I.getOperand(0));
7127 SDValue TripCount = getValue(I.getOperand(1));
7128 Type *ElementTy = I.getOperand(0)->getType();
7129 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
7130 unsigned VecWidth = VT.getVectorNumElements();
7131
7132 SmallVector<SDValue, 16> OpsTripCount;
7133 SmallVector<SDValue, 16> OpsIndex;
7134 SmallVector<SDValue, 16> OpsStepConstants;
7135 for (unsigned i = 0; i < VecWidth; i++) {
7136 OpsTripCount.push_back(TripCount);
7137 OpsIndex.push_back(Index);
7138 OpsStepConstants.push_back(
7139 DAG.getConstant(i, DL, EVT::getEVT(ElementTy)));
7140 }
7141
7142 EVT CCVT = EVT::getVectorVT(I.getContext(), MVT::i1, VecWidth);
7143
7144 auto VecTy = EVT::getEVT(FixedVectorType::get(ElementTy, VecWidth));
7145 SDValue VectorIndex = DAG.getBuildVector(VecTy, DL, OpsIndex);
7146 SDValue VectorStep = DAG.getBuildVector(VecTy, DL, OpsStepConstants);
7147 SDValue VectorInduction = DAG.getNode(
7148 ISD::UADDO, DL, DAG.getVTList(VecTy, CCVT), VectorIndex, VectorStep);
7149 SDValue VectorTripCount = DAG.getBuildVector(VecTy, DL, OpsTripCount);
7150 SDValue SetCC = DAG.getSetCC(DL, CCVT, VectorInduction.getValue(0),
7151 VectorTripCount, ISD::CondCode::SETULT);
7152 setValue(&I, DAG.getNode(ISD::AND, DL, CCVT,
7153 DAG.getNOT(DL, VectorInduction.getValue(1), CCVT),
7154 SetCC));
7155 return;
7156 }
7157 case Intrinsic::experimental_vector_insert: {
7158 auto DL = getCurSDLoc();
7159
7160 SDValue Vec = getValue(I.getOperand(0));
7161 SDValue SubVec = getValue(I.getOperand(1));
7162 SDValue Index = getValue(I.getOperand(2));
7163
7164 // The intrinsic's index type is i64, but the SDNode requires an index type
7165 // suitable for the target. Convert the index as required.
7166 MVT VectorIdxTy = TLI.getVectorIdxTy(DAG.getDataLayout());
7167 if (Index.getValueType() != VectorIdxTy)
7168 Index = DAG.getVectorIdxConstant(
7169 cast<ConstantSDNode>(Index)->getZExtValue(), DL);
7170
7171 EVT ResultVT = TLI.getValueType(DAG.getDataLayout(), I.getType());
7172 setValue(&I, DAG.getNode(ISD::INSERT_SUBVECTOR, DL, ResultVT, Vec, SubVec,
7173 Index));
7174 return;
7175 }
7176 case Intrinsic::experimental_vector_extract: {
7177 auto DL = getCurSDLoc();
7178
7179 SDValue Vec = getValue(I.getOperand(0));
7180 SDValue Index = getValue(I.getOperand(1));
7181 EVT ResultVT = TLI.getValueType(DAG.getDataLayout(), I.getType());
7182
7183 // The intrinsic's index type is i64, but the SDNode requires an index type
7184 // suitable for the target. Convert the index as required.
7185 MVT VectorIdxTy = TLI.getVectorIdxTy(DAG.getDataLayout());
7186 if (Index.getValueType() != VectorIdxTy)
7187 Index = DAG.getVectorIdxConstant(
7188 cast<ConstantSDNode>(Index)->getZExtValue(), DL);
7189
7190 setValue(&I, DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, ResultVT, Vec, Index));
7191 return;
7192 }
7193 case Intrinsic::experimental_vector_reverse:
7194 visitVectorReverse(I);
7195 return;
7196 case Intrinsic::experimental_vector_splice:
7197 visitVectorSplice(I);
7198 return;
7199 }
7200}
7201
7202void SelectionDAGBuilder::visitConstrainedFPIntrinsic(
7203 const ConstrainedFPIntrinsic &FPI) {
7204 SDLoc sdl = getCurSDLoc();
7205
7206 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
7207 SmallVector<EVT, 4> ValueVTs;
7208 ComputeValueVTs(TLI, DAG.getDataLayout(), FPI.getType(), ValueVTs);
7209 ValueVTs.push_back(MVT::Other); // Out chain
7210
7211 // We do not need to serialize constrained FP intrinsics against
7212 // each other or against (nonvolatile) loads, so they can be
7213 // chained like loads.
7214 SDValue Chain = DAG.getRoot();
7215 SmallVector<SDValue, 4> Opers;
7216 Opers.push_back(Chain);
7217 if (FPI.isUnaryOp()) {
7218 Opers.push_back(getValue(FPI.getArgOperand(0)));
7219 } else if (FPI.isTernaryOp()) {
7220 Opers.push_back(getValue(FPI.getArgOperand(0)));
7221 Opers.push_back(getValue(FPI.getArgOperand(1)));
7222 Opers.push_back(getValue(FPI.getArgOperand(2)));
7223 } else {
7224 Opers.push_back(getValue(FPI.getArgOperand(0)));
7225 Opers.push_back(getValue(FPI.getArgOperand(1)));
7226 }
7227
7228 auto pushOutChain = [this](SDValue Result, fp::ExceptionBehavior EB) {
7229 assert(Result.getNode()->getNumValues() == 2)((void)0);
7230
7231 // Push node to the appropriate list so that future instructions can be
7232 // chained up correctly.
7233 SDValue OutChain = Result.getValue(1);
7234 switch (EB) {
7235 case fp::ExceptionBehavior::ebIgnore:
7236 // The only reason why ebIgnore nodes still need to be chained is that
7237 // they might depend on the current rounding mode, and therefore must
7238 // not be moved across instruction that may change that mode.
7239 LLVM_FALLTHROUGH[[gnu::fallthrough]];
7240 case fp::ExceptionBehavior::ebMayTrap:
7241 // These must not be moved across calls or instructions that may change
7242 // floating-point exception masks.
7243 PendingConstrainedFP.push_back(OutChain);
7244 break;
7245 case fp::ExceptionBehavior::ebStrict:
7246 // These must not be moved across calls or instructions that may change
7247 // floating-point exception masks or read floating-point exception flags.
7248 // In addition, they cannot be optimized out even if unused.
7249 PendingConstrainedFPStrict.push_back(OutChain);
7250 break;
7251 }
7252 };
7253
7254 SDVTList VTs = DAG.getVTList(ValueVTs);
7255 fp::ExceptionBehavior EB = FPI.getExceptionBehavior().getValue();
7256
7257 SDNodeFlags Flags;
7258 if (EB == fp::ExceptionBehavior::ebIgnore)
7259 Flags.setNoFPExcept(true);
7260
7261 if (auto *FPOp = dyn_cast<FPMathOperator>(&FPI))
7262 Flags.copyFMF(*FPOp);
7263
7264 unsigned Opcode;
7265 switch (FPI.getIntrinsicID()) {
7266 default: llvm_unreachable("Impossible intrinsic")__builtin_unreachable(); // Can't reach here.
7267#define DAG_INSTRUCTION(NAME, NARG, ROUND_MODE, INTRINSIC, DAGN) \
7268 case Intrinsic::INTRINSIC: \
7269 Opcode = ISD::STRICT_##DAGN; \
7270 break;
7271#include "llvm/IR/ConstrainedOps.def"
7272 case Intrinsic::experimental_constrained_fmuladd: {
7273 Opcode = ISD::STRICT_FMA;
7274 // Break fmuladd into fmul and fadd.
7275 if (TM.Options.AllowFPOpFusion == FPOpFusion::Strict ||
7276 !TLI.isFMAFasterThanFMulAndFAdd(DAG.getMachineFunction(),
7277 ValueVTs[0])) {
7278 Opers.pop_back();
7279 SDValue Mul = DAG.getNode(ISD::STRICT_FMUL, sdl, VTs, Opers, Flags);
7280 pushOutChain(Mul, EB);
7281 Opcode = ISD::STRICT_FADD;
7282 Opers.clear();
7283 Opers.push_back(Mul.getValue(1));
7284 Opers.push_back(Mul.getValue(0));
7285 Opers.push_back(getValue(FPI.getArgOperand(2)));
7286 }
7287 break;
7288 }
7289 }
7290
7291 // A few strict DAG nodes carry additional operands that are not
7292 // set up by the default code above.
7293 switch (Opcode) {
7294 default: break;
7295 case ISD::STRICT_FP_ROUND:
7296 Opers.push_back(
7297 DAG.getTargetConstant(0, sdl, TLI.getPointerTy(DAG.getDataLayout())));
7298 break;
7299 case ISD::STRICT_FSETCC:
7300 case ISD::STRICT_FSETCCS: {
7301 auto *FPCmp = dyn_cast<ConstrainedFPCmpIntrinsic>(&FPI);
7302 ISD::CondCode Condition = getFCmpCondCode(FPCmp->getPredicate());
7303 if (TM.Options.NoNaNsFPMath)
7304 Condition = getFCmpCodeWithoutNaN(Condition);
7305 Opers.push_back(DAG.getCondCode(Condition));
7306 break;
7307 }
7308 }
7309
7310 SDValue Result = DAG.getNode(Opcode, sdl, VTs, Opers, Flags);
7311 pushOutChain(Result, EB);
7312
7313 SDValue FPResult = Result.getValue(0);
7314 setValue(&FPI, FPResult);
7315}
7316
7317static unsigned getISDForVPIntrinsic(const VPIntrinsic &VPIntrin) {
7318 Optional<unsigned> ResOPC;
7319 switch (VPIntrin.getIntrinsicID()) {
7320#define BEGIN_REGISTER_VP_INTRINSIC(INTRIN, ...) case Intrinsic::INTRIN:
7321#define BEGIN_REGISTER_VP_SDNODE(VPSDID, ...) ResOPC = ISD::VPSDID;
7322#define END_REGISTER_VP_INTRINSIC(...) break;
7323#include "llvm/IR/VPIntrinsics.def"
7324 }
7325
7326 if (!ResOPC.hasValue())
7327 llvm_unreachable(__builtin_unreachable()
7328 "Inconsistency: no SDNode available for this VPIntrinsic!")__builtin_unreachable();
7329
7330 return ResOPC.getValue();
7331}
7332
7333void SelectionDAGBuilder::visitVectorPredicationIntrinsic(
7334 const VPIntrinsic &VPIntrin) {
7335 SDLoc DL = getCurSDLoc();
7336 unsigned Opcode = getISDForVPIntrinsic(VPIntrin);
7337
7338 SmallVector<EVT, 4> ValueVTs;
7339 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
7340 ComputeValueVTs(TLI, DAG.getDataLayout(), VPIntrin.getType(), ValueVTs);
7341 SDVTList VTs = DAG.getVTList(ValueVTs);
7342
7343 auto EVLParamPos =
7344 VPIntrinsic::getVectorLengthParamPos(VPIntrin.getIntrinsicID());
7345
7346 MVT EVLParamVT = TLI.getVPExplicitVectorLengthTy();
7347 assert(EVLParamVT.isScalarInteger() && EVLParamVT.bitsGE(MVT::i32) &&((void)0)
7348 "Unexpected target EVL type")((void)0);
7349
7350 // Request operands.
7351 SmallVector<SDValue, 7> OpValues;
7352 for (unsigned I = 0; I < VPIntrin.getNumArgOperands(); ++I) {
7353 auto Op = getValue(VPIntrin.getArgOperand(I));
7354 if (I == EVLParamPos)
7355 Op = DAG.getNode(ISD::ZERO_EXTEND, DL, EVLParamVT, Op);
7356 OpValues.push_back(Op);
7357 }
7358
7359 SDValue Result = DAG.getNode(Opcode, DL, VTs, OpValues);
7360 setValue(&VPIntrin, Result);
7361}
7362
7363SDValue SelectionDAGBuilder::lowerStartEH(SDValue Chain,
7364 const BasicBlock *EHPadBB,
7365 MCSymbol *&BeginLabel) {
7366 MachineFunction &MF = DAG.getMachineFunction();
7367 MachineModuleInfo &MMI = MF.getMMI();
7368
7369 // Insert a label before the invoke call to mark the try range. This can be
7370 // used to detect deletion of the invoke via the MachineModuleInfo.
7371 BeginLabel = MMI.getContext().createTempSymbol();
7372
7373 // For SjLj, keep track of which landing pads go with which invokes
7374 // so as to maintain the ordering of pads in the LSDA.
7375 unsigned CallSiteIndex = MMI.getCurrentCallSite();
7376 if (CallSiteIndex) {
7377 MF.setCallSiteBeginLabel(BeginLabel, CallSiteIndex);
7378 LPadToCallSiteMap[FuncInfo.MBBMap[EHPadBB]].push_back(CallSiteIndex);
7379
7380 // Now that the call site is handled, stop tracking it.
7381 MMI.setCurrentCallSite(0);
7382 }
7383
7384 return DAG.getEHLabel(getCurSDLoc(), Chain, BeginLabel);
7385}
7386
7387SDValue SelectionDAGBuilder::lowerEndEH(SDValue Chain, const InvokeInst *II,
7388 const BasicBlock *EHPadBB,
7389 MCSymbol *BeginLabel) {
7390 assert(BeginLabel && "BeginLabel should've been set")((void)0);
7391
7392 MachineFunction &MF = DAG.getMachineFunction();
7393 MachineModuleInfo &MMI = MF.getMMI();
7394
7395 // Insert a label at the end of the invoke call to mark the try range. This
7396 // can be used to detect deletion of the invoke via the MachineModuleInfo.
7397 MCSymbol *EndLabel = MMI.getContext().createTempSymbol();
7398 Chain = DAG.getEHLabel(getCurSDLoc(), Chain, EndLabel);
7399
7400 // Inform MachineModuleInfo of range.
7401 auto Pers = classifyEHPersonality(FuncInfo.Fn->getPersonalityFn());
7402 // There is a platform (e.g. wasm) that uses funclet style IR but does not
7403 // actually use outlined funclets and their LSDA info style.
7404 if (MF.hasEHFunclets() && isFuncletEHPersonality(Pers)) {
7405 assert(II && "II should've been set")((void)0);
7406 WinEHFuncInfo *EHInfo = MF.getWinEHFuncInfo();
7407 EHInfo->addIPToStateRange(II, BeginLabel, EndLabel);
7408 } else if (!isScopedEHPersonality(Pers)) {
7409 assert(EHPadBB)((void)0);
7410 MF.addInvoke(FuncInfo.MBBMap[EHPadBB], BeginLabel, EndLabel);
7411 }
7412
7413 return Chain;
7414}
7415
7416std::pair<SDValue, SDValue>
7417SelectionDAGBuilder::lowerInvokable(TargetLowering::CallLoweringInfo &CLI,
7418 const BasicBlock *EHPadBB) {
7419 MCSymbol *BeginLabel = nullptr;
7420
7421 if (EHPadBB) {
7422 // Both PendingLoads and PendingExports must be flushed here;
7423 // this call might not return.
7424 (void)getRoot();
7425 DAG.setRoot(lowerStartEH(getControlRoot(), EHPadBB, BeginLabel));
7426 CLI.setChain(getRoot());
7427 }
7428
7429 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
7430 std::pair<SDValue, SDValue> Result = TLI.LowerCallTo(CLI);
7431
7432 assert((CLI.IsTailCall || Result.second.getNode()) &&((void)0)
7433 "Non-null chain expected with non-tail call!")((void)0);
7434 assert((Result.second.getNode() || !Result.first.getNode()) &&((void)0)
7435 "Null value expected with tail call!")((void)0);
7436
7437 if (!Result.second.getNode()) {
7438 // As a special case, a null chain means that a tail call has been emitted
7439 // and the DAG root is already updated.
7440 HasTailCall = true;
7441
7442 // Since there's no actual continuation from this block, nothing can be
7443 // relying on us setting vregs for them.
7444 PendingExports.clear();
7445 } else {
7446 DAG.setRoot(Result.second);
7447 }
7448
7449 if (EHPadBB) {
7450 DAG.setRoot(lowerEndEH(getRoot(), cast_or_null<InvokeInst>(CLI.CB), EHPadBB,
7451 BeginLabel));
7452 }
7453
7454 return Result;
7455}
7456
7457void SelectionDAGBuilder::LowerCallTo(const CallBase &CB, SDValue Callee,
7458 bool isTailCall,
7459 bool isMustTailCall,
7460 const BasicBlock *EHPadBB) {
7461 auto &DL = DAG.getDataLayout();
7462 FunctionType *FTy = CB.getFunctionType();
7463 Type *RetTy = CB.getType();
7464
7465 TargetLowering::ArgListTy Args;
7466 Args.reserve(CB.arg_size());
7467
7468 const Value *SwiftErrorVal = nullptr;
7469 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
7470
7471 if (isTailCall) {
7472 // Avoid emitting tail calls in functions with the disable-tail-calls
7473 // attribute.
7474 auto *Caller = CB.getParent()->getParent();
7475 if (Caller->getFnAttribute("disable-tail-calls").getValueAsString() ==
7476 "true" && !isMustTailCall)
7477 isTailCall = false;
7478
7479 // We can't tail call inside a function with a swifterror argument. Lowering
7480 // does not support this yet. It would have to move into the swifterror
7481 // register before the call.
7482 if (TLI.supportSwiftError() &&
7483 Caller->getAttributes().hasAttrSomewhere(Attribute::SwiftError))
7484 isTailCall = false;
7485 }
7486
7487 for (auto I = CB.arg_begin(), E = CB.arg_end(); I != E; ++I) {
7488 TargetLowering::ArgListEntry Entry;
7489 const Value *V = *I;
7490
7491 // Skip empty types
7492 if (V->getType()->isEmptyTy())
7493 continue;
7494
7495 SDValue ArgNode = getValue(V);
7496 Entry.Node = ArgNode; Entry.Ty = V->getType();
7497
7498 Entry.setAttributes(&CB, I - CB.arg_begin());
7499
7500 // Use swifterror virtual register as input to the call.
7501 if (Entry.IsSwiftError && TLI.supportSwiftError()) {
7502 SwiftErrorVal = V;
7503 // We find the virtual register for the actual swifterror argument.
7504 // Instead of using the Value, we use the virtual register instead.
7505 Entry.Node =
7506 DAG.getRegister(SwiftError.getOrCreateVRegUseAt(&CB, FuncInfo.MBB, V),
7507 EVT(TLI.getPointerTy(DL)));
7508 }
7509
7510 Args.push_back(Entry);
7511
7512 // If we have an explicit sret argument that is an Instruction, (i.e., it
7513 // might point to function-local memory), we can't meaningfully tail-call.
7514 if (Entry.IsSRet && isa<Instruction>(V))
7515 isTailCall = false;
7516 }
7517
7518 // If call site has a cfguardtarget operand bundle, create and add an
7519 // additional ArgListEntry.
7520 if (auto Bundle = CB.getOperandBundle(LLVMContext::OB_cfguardtarget)) {
7521 TargetLowering::ArgListEntry Entry;
7522 Value *V = Bundle->Inputs[0];
7523 SDValue ArgNode = getValue(V);
7524 Entry.Node = ArgNode;
7525 Entry.Ty = V->getType();
7526 Entry.IsCFGuardTarget = true;
7527 Args.push_back(Entry);
7528 }
7529
7530 // Check if target-independent constraints permit a tail call here.
7531 // Target-dependent constraints are checked within TLI->LowerCallTo.
7532 if (isTailCall && !isInTailCallPosition(CB, DAG.getTarget()))
7533 isTailCall = false;
7534
7535 // Disable tail calls if there is an swifterror argument. Targets have not
7536 // been updated to support tail calls.
7537 if (TLI.supportSwiftError() && SwiftErrorVal)
7538 isTailCall = false;
7539
7540 TargetLowering::CallLoweringInfo CLI(DAG);
7541 CLI.setDebugLoc(getCurSDLoc())
7542 .setChain(getRoot())
7543 .setCallee(RetTy, FTy, Callee, std::move(Args), CB)
7544 .setTailCall(isTailCall)
7545 .setConvergent(CB.isConvergent())
7546 .setIsPreallocated(
7547 CB.countOperandBundlesOfType(LLVMContext::OB_preallocated) != 0);
7548 std::pair<SDValue, SDValue> Result = lowerInvokable(CLI, EHPadBB);
7549
7550 if (Result.first.getNode()) {
7551 Result.first = lowerRangeToAssertZExt(DAG, CB, Result.first);
7552 setValue(&CB, Result.first);
7553 }
7554
7555 // The last element of CLI.InVals has the SDValue for swifterror return.
7556 // Here we copy it to a virtual register and update SwiftErrorMap for
7557 // book-keeping.
7558 if (SwiftErrorVal && TLI.supportSwiftError()) {
7559 // Get the last element of InVals.
7560 SDValue Src = CLI.InVals.back();
7561 Register VReg =
7562 SwiftError.getOrCreateVRegDefAt(&CB, FuncInfo.MBB, SwiftErrorVal);
7563 SDValue CopyNode = CLI.DAG.getCopyToReg(Result.second, CLI.DL, VReg, Src);
7564 DAG.setRoot(CopyNode);
7565 }
7566}
7567
7568static SDValue getMemCmpLoad(const Value *PtrVal, MVT LoadVT,
7569 SelectionDAGBuilder &Builder) {
7570 // Check to see if this load can be trivially constant folded, e.g. if the
7571 // input is from a string literal.
7572 if (const Constant *LoadInput = dyn_cast<Constant>(PtrVal)) {
7573 // Cast pointer to the type we really want to load.
7574 Type *LoadTy =
7575 Type::getIntNTy(PtrVal->getContext(), LoadVT.getScalarSizeInBits());
7576 if (LoadVT.isVector())
7577 LoadTy = FixedVectorType::get(LoadTy, LoadVT.getVectorNumElements());
7578
7579 LoadInput = ConstantExpr::getBitCast(const_cast<Constant *>(LoadInput),
7580 PointerType::getUnqual(LoadTy));
7581
7582 if (const Constant *LoadCst = ConstantFoldLoadFromConstPtr(
7583 const_cast<Constant *>(LoadInput), LoadTy, *Builder.DL))
7584 return Builder.getValue(LoadCst);
7585 }
7586
7587 // Otherwise, we have to emit the load. If the pointer is to unfoldable but
7588 // still constant memory, the input chain can be the entry node.
7589 SDValue Root;
7590 bool ConstantMemory = false;
7591
7592 // Do not serialize (non-volatile) loads of constant memory with anything.
7593 if (Builder.AA && Builder.AA->pointsToConstantMemory(PtrVal)) {
7594 Root = Builder.DAG.getEntryNode();
7595 ConstantMemory = true;
7596 } else {
7597 // Do not serialize non-volatile loads against each other.
7598 Root = Builder.DAG.getRoot();
7599 }
7600
7601 SDValue Ptr = Builder.getValue(PtrVal);
7602 SDValue LoadVal =
7603 Builder.DAG.getLoad(LoadVT, Builder.getCurSDLoc(), Root, Ptr,
7604 MachinePointerInfo(PtrVal), Align(1));
7605
7606 if (!ConstantMemory)
7607 Builder.PendingLoads.push_back(LoadVal.getValue(1));
7608 return LoadVal;
7609}
7610
7611/// Record the value for an instruction that produces an integer result,
7612/// converting the type where necessary.
7613void SelectionDAGBuilder::processIntegerCallValue(const Instruction &I,
7614 SDValue Value,
7615 bool IsSigned) {
7616 EVT VT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
7617 I.getType(), true);
7618 if (IsSigned)
7619 Value = DAG.getSExtOrTrunc(Value, getCurSDLoc(), VT);
7620 else
7621 Value = DAG.getZExtOrTrunc(Value, getCurSDLoc(), VT);
7622 setValue(&I, Value);
7623}
7624
7625/// See if we can lower a memcmp/bcmp call into an optimized form. If so, return
7626/// true and lower it. Otherwise return false, and it will be lowered like a
7627/// normal call.
7628/// The caller already checked that \p I calls the appropriate LibFunc with a
7629/// correct prototype.
7630bool SelectionDAGBuilder::visitMemCmpBCmpCall(const CallInst &I) {
7631 const Value *LHS = I.getArgOperand(0), *RHS = I.getArgOperand(1);
7632 const Value *Size = I.getArgOperand(2);
7633 const ConstantInt *CSize = dyn_cast<ConstantInt>(Size);
7634 if (CSize && CSize->getZExtValue() == 0) {
7635 EVT CallVT = DAG.getTargetLoweringInfo().getValueType(DAG.getDataLayout(),
7636 I.getType(), true);
7637 setValue(&I, DAG.getConstant(0, getCurSDLoc(), CallVT));
7638 return true;
7639 }
7640
7641 const SelectionDAGTargetInfo &TSI = DAG.getSelectionDAGInfo();
7642 std::pair<SDValue, SDValue> Res = TSI.EmitTargetCodeForMemcmp(
7643 DAG, getCurSDLoc(), DAG.getRoot(), getValue(LHS), getValue(RHS),
7644 getValue(Size), MachinePointerInfo(LHS), MachinePointerInfo(RHS));
7645 if (Res.first.getNode()) {
7646 processIntegerCallValue(I, Res.first, true);
7647 PendingLoads.push_back(Res.second);
7648 return true;
7649 }
7650
7651 // memcmp(S1,S2,2) != 0 -> (*(short*)LHS != *(short*)RHS) != 0
7652 // memcmp(S1,S2,4) != 0 -> (*(int*)LHS != *(int*)RHS) != 0
7653 if (!CSize || !isOnlyUsedInZeroEqualityComparison(&I))
7654 return false;
7655
7656 // If the target has a fast compare for the given size, it will return a
7657 // preferred load type for that size. Require that the load VT is legal and
7658 // that the target supports unaligned loads of that type. Otherwise, return
7659 // INVALID.
7660 auto hasFastLoadsAndCompare = [&](unsigned NumBits) {
7661 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
7662 MVT LVT = TLI.hasFastEqualityCompare(NumBits);
7663 if (LVT != MVT::INVALID_SIMPLE_VALUE_TYPE) {
7664 // TODO: Handle 5 byte compare as 4-byte + 1 byte.
7665 // TODO: Handle 8 byte compare on x86-32 as two 32-bit loads.
7666 // TODO: Check alignment of src and dest ptrs.
7667 unsigned DstAS = LHS->getType()->getPointerAddressSpace();
7668 unsigned SrcAS = RHS->getType()->getPointerAddressSpace();
7669 if (!TLI.isTypeLegal(LVT) ||
7670 !TLI.allowsMisalignedMemoryAccesses(LVT, SrcAS) ||
7671 !TLI.allowsMisalignedMemoryAccesses(LVT, DstAS))
7672 LVT = MVT::INVALID_SIMPLE_VALUE_TYPE;
7673 }
7674
7675 return LVT;
7676 };
7677
7678 // This turns into unaligned loads. We only do this if the target natively
7679 // supports the MVT we'll be loading or if it is small enough (<= 4) that
7680 // we'll only produce a small number of byte loads.
7681 MVT LoadVT;
7682 unsigned NumBitsToCompare = CSize->getZExtValue() * 8;
7683 switch (NumBitsToCompare) {
7684 default:
7685 return false;
7686 case 16:
7687 LoadVT = MVT::i16;
7688 break;
7689 case 32:
7690 LoadVT = MVT::i32;
7691 break;
7692 case 64:
7693 case 128:
7694 case 256:
7695 LoadVT = hasFastLoadsAndCompare(NumBitsToCompare);
7696 break;
7697 }
7698
7699 if (LoadVT == MVT::INVALID_SIMPLE_VALUE_TYPE)
7700 return false;
7701
7702 SDValue LoadL = getMemCmpLoad(LHS, LoadVT, *this);
7703 SDValue LoadR = getMemCmpLoad(RHS, LoadVT, *this);
7704
7705 // Bitcast to a wide integer type if the loads are vectors.
7706 if (LoadVT.isVector()) {
7707 EVT CmpVT = EVT::getIntegerVT(LHS->getContext(), LoadVT.getSizeInBits());
7708 LoadL = DAG.getBitcast(CmpVT, LoadL);
7709 LoadR = DAG.getBitcast(CmpVT, LoadR);
7710 }
7711
7712 SDValue Cmp = DAG.getSetCC(getCurSDLoc(), MVT::i1, LoadL, LoadR, ISD::SETNE);
7713 processIntegerCallValue(I, Cmp, false);
7714 return true;
7715}
7716
7717/// See if we can lower a memchr call into an optimized form. If so, return
7718/// true and lower it. Otherwise return false, and it will be lowered like a
7719/// normal call.
7720/// The caller already checked that \p I calls the appropriate LibFunc with a
7721/// correct prototype.
7722bool SelectionDAGBuilder::visitMemChrCall(const CallInst &I) {
7723 const Value *Src = I.getArgOperand(0);
7724 const Value *Char = I.getArgOperand(1);
7725 const Value *Length = I.getArgOperand(2);
7726
7727 const SelectionDAGTargetInfo &TSI = DAG.getSelectionDAGInfo();
7728 std::pair<SDValue, SDValue> Res =
7729 TSI.EmitTargetCodeForMemchr(DAG, getCurSDLoc(), DAG.getRoot(),
7730 getValue(Src), getValue(Char), getValue(Length),
7731 MachinePointerInfo(Src));
7732 if (Res.first.getNode()) {
7733 setValue(&I, Res.first);
7734 PendingLoads.push_back(Res.second);
7735 return true;
7736 }
7737
7738 return false;
7739}
7740
7741/// See if we can lower a mempcpy call into an optimized form. If so, return
7742/// true and lower it. Otherwise return false, and it will be lowered like a
7743/// normal call.
7744/// The caller already checked that \p I calls the appropriate LibFunc with a
7745/// correct prototype.
7746bool SelectionDAGBuilder::visitMemPCpyCall(const CallInst &I) {
7747 SDValue Dst = getValue(I.getArgOperand(0));
7748 SDValue Src = getValue(I.getArgOperand(1));
7749 SDValue Size = getValue(I.getArgOperand(2));
7750
7751 Align DstAlign = DAG.InferPtrAlign(Dst).valueOrOne();
7752 Align SrcAlign = DAG.InferPtrAlign(Src).valueOrOne();
7753 // DAG::getMemcpy needs Alignment to be defined.
7754 Align Alignment = std::min(DstAlign, SrcAlign);
7755
7756 bool isVol = false;
7757 SDLoc sdl = getCurSDLoc();
7758
7759 // In the mempcpy context we need to pass in a false value for isTailCall
7760 // because the return pointer needs to be adjusted by the size of
7761 // the copied memory.
7762 SDValue Root = isVol ? getRoot() : getMemoryRoot();
7763 AAMDNodes AAInfo;
7764 I.getAAMetadata(AAInfo);
7765 SDValue MC = DAG.getMemcpy(Root, sdl, Dst, Src, Size, Alignment, isVol, false,
7766 /*isTailCall=*/false,
7767 MachinePointerInfo(I.getArgOperand(0)),
7768 MachinePointerInfo(I.getArgOperand(1)), AAInfo);
7769 assert(MC.getNode() != nullptr &&((void)0)
7770 "** memcpy should not be lowered as TailCall in mempcpy context **")((void)0);
7771 DAG.setRoot(MC);
7772
7773 // Check if Size needs to be truncated or extended.
7774 Size = DAG.getSExtOrTrunc(Size, sdl, Dst.getValueType());
7775
7776 // Adjust return pointer to point just past the last dst byte.
7777 SDValue DstPlusSize = DAG.getNode(ISD::ADD, sdl, Dst.getValueType(),
7778 Dst, Size);
7779 setValue(&I, DstPlusSize);
7780 return true;
7781}
7782
7783/// See if we can lower a strcpy call into an optimized form. If so, return
7784/// true and lower it, otherwise return false and it will be lowered like a
7785/// normal call.
7786/// The caller already checked that \p I calls the appropriate LibFunc with a
7787/// correct prototype.
7788bool SelectionDAGBuilder::visitStrCpyCall(const CallInst &I, bool isStpcpy) {
7789 const Value *Arg0 = I.getArgOperand(0), *Arg1 = I.getArgOperand(1);
7790
7791 const SelectionDAGTargetInfo &TSI = DAG.getSelectionDAGInfo();
7792 std::pair<SDValue, SDValue> Res =
7793 TSI.EmitTargetCodeForStrcpy(DAG, getCurSDLoc(), getRoot(),
7794 getValue(Arg0), getValue(Arg1),
7795 MachinePointerInfo(Arg0),
7796 MachinePointerInfo(Arg1), isStpcpy);
7797 if (Res.first.getNode()) {
7798 setValue(&I, Res.first);
7799 DAG.setRoot(Res.second);
7800 return true;
7801 }
7802
7803 return false;
7804}
7805
7806/// See if we can lower a strcmp call into an optimized form. If so, return
7807/// true and lower it, otherwise return false and it will be lowered like a
7808/// normal call.
7809/// The caller already checked that \p I calls the appropriate LibFunc with a
7810/// correct prototype.
7811bool SelectionDAGBuilder::visitStrCmpCall(const CallInst &I) {
7812 const Value *Arg0 = I.getArgOperand(0), *Arg1 = I.getArgOperand(1);
7813
7814 const SelectionDAGTargetInfo &TSI = DAG.getSelectionDAGInfo();
7815 std::pair<SDValue, SDValue> Res =
7816 TSI.EmitTargetCodeForStrcmp(DAG, getCurSDLoc(), DAG.getRoot(),
7817 getValue(Arg0), getValue(Arg1),
7818 MachinePointerInfo(Arg0),
7819 MachinePointerInfo(Arg1));
7820 if (Res.first.getNode()) {
7821 processIntegerCallValue(I, Res.first, true);
7822 PendingLoads.push_back(Res.second);
7823 return true;
7824 }
7825
7826 return false;
7827}
7828
7829/// See if we can lower a strlen call into an optimized form. If so, return
7830/// true and lower it, otherwise return false and it will be lowered like a
7831/// normal call.
7832/// The caller already checked that \p I calls the appropriate LibFunc with a
7833/// correct prototype.
7834bool SelectionDAGBuilder::visitStrLenCall(const CallInst &I) {
7835 const Value *Arg0 = I.getArgOperand(0);
7836
7837 const SelectionDAGTargetInfo &TSI = DAG.getSelectionDAGInfo();
7838 std::pair<SDValue, SDValue> Res =
7839 TSI.EmitTargetCodeForStrlen(DAG, getCurSDLoc(), DAG.getRoot(),
7840 getValue(Arg0), MachinePointerInfo(Arg0));
7841 if (Res.first.getNode()) {
7842 processIntegerCallValue(I, Res.first, false);
7843 PendingLoads.push_back(Res.second);
7844 return true;
7845 }
7846
7847 return false;
7848}
7849
7850/// See if we can lower a strnlen call into an optimized form. If so, return
7851/// true and lower it, otherwise return false and it will be lowered like a
7852/// normal call.
7853/// The caller already checked that \p I calls the appropriate LibFunc with a
7854/// correct prototype.
7855bool SelectionDAGBuilder::visitStrNLenCall(const CallInst &I) {
7856 const Value *Arg0 = I.getArgOperand(0), *Arg1 = I.getArgOperand(1);
7857
7858 const SelectionDAGTargetInfo &TSI = DAG.getSelectionDAGInfo();
7859 std::pair<SDValue, SDValue> Res =
7860 TSI.EmitTargetCodeForStrnlen(DAG, getCurSDLoc(), DAG.getRoot(),
7861 getValue(Arg0), getValue(Arg1),
7862 MachinePointerInfo(Arg0));
7863 if (Res.first.getNode()) {
7864 processIntegerCallValue(I, Res.first, false);
7865 PendingLoads.push_back(Res.second);
7866 return true;
7867 }
7868
7869 return false;
7870}
7871
7872/// See if we can lower a unary floating-point operation into an SDNode with
7873/// the specified Opcode. If so, return true and lower it, otherwise return
7874/// false and it will be lowered like a normal call.
7875/// The caller already checked that \p I calls the appropriate LibFunc with a
7876/// correct prototype.
7877bool SelectionDAGBuilder::visitUnaryFloatCall(const CallInst &I,
7878 unsigned Opcode) {
7879 // We already checked this call's prototype; verify it doesn't modify errno.
7880 if (!I.onlyReadsMemory())
7881 return false;
7882
7883 SDNodeFlags Flags;
7884 Flags.copyFMF(cast<FPMathOperator>(I));
7885
7886 SDValue Tmp = getValue(I.getArgOperand(0));
7887 setValue(&I,
7888 DAG.getNode(Opcode, getCurSDLoc(), Tmp.getValueType(), Tmp, Flags));
7889 return true;
7890}
7891
7892/// See if we can lower a binary floating-point operation into an SDNode with
7893/// the specified Opcode. If so, return true and lower it. Otherwise return
7894/// false, and it will be lowered like a normal call.
7895/// The caller already checked that \p I calls the appropriate LibFunc with a
7896/// correct prototype.
7897bool SelectionDAGBuilder::visitBinaryFloatCall(const CallInst &I,
7898 unsigned Opcode) {
7899 // We already checked this call's prototype; verify it doesn't modify errno.
7900 if (!I.onlyReadsMemory())
7901 return false;
7902
7903 SDNodeFlags Flags;
7904 Flags.copyFMF(cast<FPMathOperator>(I));
7905
7906 SDValue Tmp0 = getValue(I.getArgOperand(0));
7907 SDValue Tmp1 = getValue(I.getArgOperand(1));
7908 EVT VT = Tmp0.getValueType();
7909 setValue(&I, DAG.getNode(Opcode, getCurSDLoc(), VT, Tmp0, Tmp1, Flags));
7910 return true;
7911}
7912
7913void SelectionDAGBuilder::visitCall(const CallInst &I) {
7914 // Handle inline assembly differently.
7915 if (I.isInlineAsm()) {
7916 visitInlineAsm(I);
7917 return;
7918 }
7919
7920 if (Function *F = I.getCalledFunction()) {
7921 if (F->isDeclaration()) {
7922 // Is this an LLVM intrinsic or a target-specific intrinsic?
7923 unsigned IID = F->getIntrinsicID();
7924 if (!IID)
7925 if (const TargetIntrinsicInfo *II = TM.getIntrinsicInfo())
7926 IID = II->getIntrinsicID(F);
7927
7928 if (IID) {
7929 visitIntrinsicCall(I, IID);
7930 return;
7931 }
7932 }
7933
7934 // Check for well-known libc/libm calls. If the function is internal, it
7935 // can't be a library call. Don't do the check if marked as nobuiltin for
7936 // some reason or the call site requires strict floating point semantics.
7937 LibFunc Func;
7938 if (!I.isNoBuiltin() && !I.isStrictFP() && !F->hasLocalLinkage() &&
7939 F->hasName() && LibInfo->getLibFunc(*F, Func) &&
7940 LibInfo->hasOptimizedCodeGen(Func)) {
7941 switch (Func) {
7942 default: break;
7943 case LibFunc_bcmp:
7944 if (visitMemCmpBCmpCall(I))
7945 return;
7946 break;
7947 case LibFunc_copysign:
7948 case LibFunc_copysignf:
7949 case LibFunc_copysignl:
7950 // We already checked this call's prototype; verify it doesn't modify
7951 // errno.
7952 if (I.onlyReadsMemory()) {
7953 SDValue LHS = getValue(I.getArgOperand(0));
7954 SDValue RHS = getValue(I.getArgOperand(1));
7955 setValue(&I, DAG.getNode(ISD::FCOPYSIGN, getCurSDLoc(),
7956 LHS.getValueType(), LHS, RHS));
7957 return;
7958 }
7959 break;
7960 case LibFunc_fabs:
7961 case LibFunc_fabsf:
7962 case LibFunc_fabsl:
7963 if (visitUnaryFloatCall(I, ISD::FABS))
7964 return;
7965 break;
7966 case LibFunc_fmin:
7967 case LibFunc_fminf:
7968 case LibFunc_fminl:
7969 if (visitBinaryFloatCall(I, ISD::FMINNUM))
7970 return;
7971 break;
7972 case LibFunc_fmax:
7973 case LibFunc_fmaxf:
7974 case LibFunc_fmaxl:
7975 if (visitBinaryFloatCall(I, ISD::FMAXNUM))
7976 return;
7977 break;
7978 case LibFunc_sin:
7979 case LibFunc_sinf:
7980 case LibFunc_sinl:
7981 if (visitUnaryFloatCall(I, ISD::FSIN))
7982 return;
7983 break;
7984 case LibFunc_cos:
7985 case LibFunc_cosf:
7986 case LibFunc_cosl:
7987 if (visitUnaryFloatCall(I, ISD::FCOS))
7988 return;
7989 break;
7990 case LibFunc_sqrt:
7991 case LibFunc_sqrtf:
7992 case LibFunc_sqrtl:
7993 case LibFunc_sqrt_finite:
7994 case LibFunc_sqrtf_finite:
7995 case LibFunc_sqrtl_finite:
7996 if (visitUnaryFloatCall(I, ISD::FSQRT))
7997 return;
7998 break;
7999 case LibFunc_floor:
8000 case LibFunc_floorf:
8001 case LibFunc_floorl:
8002 if (visitUnaryFloatCall(I, ISD::FFLOOR))
8003 return;
8004 break;
8005 case LibFunc_nearbyint:
8006 case LibFunc_nearbyintf:
8007 case LibFunc_nearbyintl:
8008 if (visitUnaryFloatCall(I, ISD::FNEARBYINT))
8009 return;
8010 break;
8011 case LibFunc_ceil:
8012 case LibFunc_ceilf:
8013 case LibFunc_ceill:
8014 if (visitUnaryFloatCall(I, ISD::FCEIL))
8015 return;
8016 break;
8017 case LibFunc_rint:
8018 case LibFunc_rintf:
8019 case LibFunc_rintl:
8020 if (visitUnaryFloatCall(I, ISD::FRINT))
8021 return;
8022 break;
8023 case LibFunc_round:
8024 case LibFunc_roundf:
8025 case LibFunc_roundl:
8026 if (visitUnaryFloatCall(I, ISD::FROUND))
8027 return;
8028 break;
8029 case LibFunc_trunc:
8030 case LibFunc_truncf:
8031 case LibFunc_truncl:
8032 if (visitUnaryFloatCall(I, ISD::FTRUNC))
8033 return;
8034 break;
8035 case LibFunc_log2:
8036 case LibFunc_log2f:
8037 case LibFunc_log2l:
8038 if (visitUnaryFloatCall(I, ISD::FLOG2))
8039 return;
8040 break;
8041 case LibFunc_exp2:
8042 case LibFunc_exp2f:
8043 case LibFunc_exp2l:
8044 if (visitUnaryFloatCall(I, ISD::FEXP2))
8045 return;
8046 break;
8047 case LibFunc_memcmp:
8048 if (visitMemCmpBCmpCall(I))
8049 return;
8050 break;
8051 case LibFunc_mempcpy:
8052 if (visitMemPCpyCall(I))
8053 return;
8054 break;
8055 case LibFunc_memchr:
8056 if (visitMemChrCall(I))
8057 return;
8058 break;
8059 case LibFunc_strcpy:
8060 if (visitStrCpyCall(I, false))
8061 return;
8062 break;
8063 case LibFunc_stpcpy:
8064 if (visitStrCpyCall(I, true))
8065 return;
8066 break;
8067 case LibFunc_strcmp:
8068 if (visitStrCmpCall(I))
8069 return;
8070 break;
8071 case LibFunc_strlen:
8072 if (visitStrLenCall(I))
8073 return;
8074 break;
8075 case LibFunc_strnlen:
8076 if (visitStrNLenCall(I))
8077 return;
8078 break;
8079 }
8080 }
8081 }
8082
8083 // Deopt bundles are lowered in LowerCallSiteWithDeoptBundle, and we don't
8084 // have to do anything here to lower funclet bundles.
8085 // CFGuardTarget bundles are lowered in LowerCallTo.
8086 assert(!I.hasOperandBundlesOtherThan(((void)0)
8087 {LLVMContext::OB_deopt, LLVMContext::OB_funclet,((void)0)
8088 LLVMContext::OB_cfguardtarget, LLVMContext::OB_preallocated,((void)0)
8089 LLVMContext::OB_clang_arc_attachedcall}) &&((void)0)
8090 "Cannot lower calls with arbitrary operand bundles!")((void)0);
8091
8092 SDValue Callee = getValue(I.getCalledOperand());
8093
8094 if (I.countOperandBundlesOfType(LLVMContext::OB_deopt))
8095 LowerCallSiteWithDeoptBundle(&I, Callee, nullptr);
8096 else
8097 // Check if we can potentially perform a tail call. More detailed checking
8098 // is be done within LowerCallTo, after more information about the call is
8099 // known.
8100 LowerCallTo(I, Callee, I.isTailCall(), I.isMustTailCall());
8101}
8102
8103namespace {
8104
8105/// AsmOperandInfo - This contains information for each constraint that we are
8106/// lowering.
8107class SDISelAsmOperandInfo : public TargetLowering::AsmOperandInfo {
8108public:
8109 /// CallOperand - If this is the result output operand or a clobber
8110 /// this is null, otherwise it is the incoming operand to the CallInst.
8111 /// This gets modified as the asm is processed.
8112 SDValue CallOperand;
8113
8114 /// AssignedRegs - If this is a register or register class operand, this
8115 /// contains the set of register corresponding to the operand.
8116 RegsForValue AssignedRegs;
8117
8118 explicit SDISelAsmOperandInfo(const TargetLowering::AsmOperandInfo &info)
8119 : TargetLowering::AsmOperandInfo(info), CallOperand(nullptr, 0) {
8120 }
8121
8122 /// Whether or not this operand accesses memory
8123 bool hasMemory(const TargetLowering &TLI) const {
8124 // Indirect operand accesses access memory.
8125 if (isIndirect)
8126 return true;
8127
8128 for (const auto &Code : Codes)
8129 if (TLI.getConstraintType(Code) == TargetLowering::C_Memory)
8130 return true;
8131
8132 return false;
8133 }
8134
8135 /// getCallOperandValEVT - Return the EVT of the Value* that this operand
8136 /// corresponds to. If there is no Value* for this operand, it returns
8137 /// MVT::Other.
8138 EVT getCallOperandValEVT(LLVMContext &Context, const TargetLowering &TLI,
8139 const DataLayout &DL) const {
8140 if (!CallOperandVal) return MVT::Other;
8141
8142 if (isa<BasicBlock>(CallOperandVal))
8143 return TLI.getProgramPointerTy(DL);
8144
8145 llvm::Type *OpTy = CallOperandVal->getType();
8146
8147 // FIXME: code duplicated from TargetLowering::ParseConstraints().
8148 // If this is an indirect operand, the operand is a pointer to the
8149 // accessed type.
8150 if (isIndirect) {
8151 PointerType *PtrTy = dyn_cast<PointerType>(OpTy);
8152 if (!PtrTy)
8153 report_fatal_error("Indirect operand for inline asm not a pointer!");
8154 OpTy = PtrTy->getElementType();
8155 }
8156
8157 // Look for vector wrapped in a struct. e.g. { <16 x i8> }.
8158 if (StructType *STy = dyn_cast<StructType>(OpTy))
8159 if (STy->getNumElements() == 1)
8160 OpTy = STy->getElementType(0);
8161
8162 // If OpTy is not a single value, it may be a struct/union that we
8163 // can tile with integers.
8164 if (!OpTy->isSingleValueType() && OpTy->isSized()) {
8165 unsigned BitSize = DL.getTypeSizeInBits(OpTy);
8166 switch (BitSize) {
8167 default: break;
8168 case 1:
8169 case 8:
8170 case 16:
8171 case 32:
8172 case 64:
8173 case 128:
8174 OpTy = IntegerType::get(Context, BitSize);
8175 break;
8176 }
8177 }
8178
8179 return TLI.getAsmOperandValueType(DL, OpTy, true);
8180 }
8181};
8182
8183
8184} // end anonymous namespace
8185
8186/// Make sure that the output operand \p OpInfo and its corresponding input
8187/// operand \p MatchingOpInfo have compatible constraint types (otherwise error
8188/// out).
8189static void patchMatchingInput(const SDISelAsmOperandInfo &OpInfo,
8190 SDISelAsmOperandInfo &MatchingOpInfo,
8191 SelectionDAG &DAG) {
8192 if (OpInfo.ConstraintVT == MatchingOpInfo.ConstraintVT)
8193 return;
8194
8195 const TargetRegisterInfo *TRI = DAG.getSubtarget().getRegisterInfo();
8196 const auto &TLI = DAG.getTargetLoweringInfo();
8197
8198 std::pair<unsigned, const TargetRegisterClass *> MatchRC =
8199 TLI.getRegForInlineAsmConstraint(TRI, OpInfo.ConstraintCode,
8200 OpInfo.ConstraintVT);
8201 std::pair<unsigned, const TargetRegisterClass *> InputRC =
8202 TLI.getRegForInlineAsmConstraint(TRI, MatchingOpInfo.ConstraintCode,
8203 MatchingOpInfo.ConstraintVT);
8204 if ((OpInfo.ConstraintVT.isInteger() !=
8205 MatchingOpInfo.ConstraintVT.isInteger()) ||
8206 (MatchRC.second != InputRC.second)) {
8207 // FIXME: error out in a more elegant fashion
8208 report_fatal_error("Unsupported asm: input constraint"
8209 " with a matching output constraint of"
8210 " incompatible type!");
8211 }
8212 MatchingOpInfo.ConstraintVT = OpInfo.ConstraintVT;
8213}
8214
8215/// Get a direct memory input to behave well as an indirect operand.
8216/// This may introduce stores, hence the need for a \p Chain.
8217/// \return The (possibly updated) chain.
8218static SDValue getAddressForMemoryInput(SDValue Chain, const SDLoc &Location,
8219 SDISelAsmOperandInfo &OpInfo,
8220 SelectionDAG &DAG) {
8221 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
8222
8223 // If we don't have an indirect input, put it in the constpool if we can,
8224 // otherwise spill it to a stack slot.
8225 // TODO: This isn't quite right. We need to handle these according to
8226 // the addressing mode that the constraint wants. Also, this may take
8227 // an additional register for the computation and we don't want that
8228 // either.
8229
8230 // If the operand is a float, integer, or vector constant, spill to a
8231 // constant pool entry to get its address.
8232 const Value *OpVal = OpInfo.CallOperandVal;
8233 if (isa<ConstantFP>(OpVal) || isa<ConstantInt>(OpVal) ||
8234 isa<ConstantVector>(OpVal) || isa<ConstantDataVector>(OpVal)) {
8235 OpInfo.CallOperand = DAG.getConstantPool(
8236 cast<Constant>(OpVal), TLI.getPointerTy(DAG.getDataLayout()));
8237 return Chain;
8238 }
8239
8240 // Otherwise, create a stack slot and emit a store to it before the asm.
8241 Type *Ty = OpVal->getType();
8242 auto &DL = DAG.getDataLayout();
8243 uint64_t TySize = DL.getTypeAllocSize(Ty);
8244 MachineFunction &MF = DAG.getMachineFunction();
8245 int SSFI = MF.getFrameInfo().CreateStackObject(
8246 TySize, DL.getPrefTypeAlign(Ty), false);
8247 SDValue StackSlot = DAG.getFrameIndex(SSFI, TLI.getFrameIndexTy(DL));
8248 Chain = DAG.getTruncStore(Chain, Location, OpInfo.CallOperand, StackSlot,
8249 MachinePointerInfo::getFixedStack(MF, SSFI),
8250 TLI.getMemValueType(DL, Ty));
8251 OpInfo.CallOperand = StackSlot;
8252
8253 return Chain;
8254}
8255
8256/// GetRegistersForValue - Assign registers (virtual or physical) for the
8257/// specified operand. We prefer to assign virtual registers, to allow the
8258/// register allocator to handle the assignment process. However, if the asm
8259/// uses features that we can't model on machineinstrs, we have SDISel do the
8260/// allocation. This produces generally horrible, but correct, code.
8261///
8262/// OpInfo describes the operand
8263/// RefOpInfo describes the matching operand if any, the operand otherwise
8264static void GetRegistersForValue(SelectionDAG &DAG, const SDLoc &DL,
8265 SDISelAsmOperandInfo &OpInfo,
8266 SDISelAsmOperandInfo &RefOpInfo) {
8267 LLVMContext &Context = *DAG.getContext();
8268 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
8269
8270 MachineFunction &MF = DAG.getMachineFunction();
8271 SmallVector<unsigned, 4> Regs;
8272 const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
8273
8274 // No work to do for memory operations.
8275 if (OpInfo.ConstraintType == TargetLowering::C_Memory)
8276 return;
8277
8278 // If this is a constraint for a single physreg, or a constraint for a
8279 // register class, find it.
8280 unsigned AssignedReg;
8281 const TargetRegisterClass *RC;
8282 std::tie(AssignedReg, RC) = TLI.getRegForInlineAsmConstraint(
8283 &TRI, RefOpInfo.ConstraintCode, RefOpInfo.ConstraintVT);
8284 // RC is unset only on failure. Return immediately.
8285 if (!RC)
8286 return;
8287
8288 // Get the actual register value type. This is important, because the user
8289 // may have asked for (e.g.) the AX register in i32 type. We need to
8290 // remember that AX is actually i16 to get the right extension.
8291 const MVT RegVT = *TRI.legalclasstypes_begin(*RC);
8292
8293 if (OpInfo.ConstraintVT != MVT::Other && RegVT != MVT::Untyped) {
8294 // If this is an FP operand in an integer register (or visa versa), or more
8295 // generally if the operand value disagrees with the register class we plan
8296 // to stick it in, fix the operand type.
8297 //
8298 // If this is an input value, the bitcast to the new type is done now.
8299 // Bitcast for output value is done at the end of visitInlineAsm().
8300 if ((OpInfo.Type == InlineAsm::isOutput ||
8301 OpInfo.Type == InlineAsm::isInput) &&
8302 !TRI.isTypeLegalForClass(*RC, OpInfo.ConstraintVT)) {
8303 // Try to convert to the first EVT that the reg class contains. If the
8304 // types are identical size, use a bitcast to convert (e.g. two differing
8305 // vector types). Note: output bitcast is done at the end of
8306 // visitInlineAsm().
8307 if (RegVT.getSizeInBits() == OpInfo.ConstraintVT.getSizeInBits()) {
8308 // Exclude indirect inputs while they are unsupported because the code
8309 // to perform the load is missing and thus OpInfo.CallOperand still
8310 // refers to the input address rather than the pointed-to value.
8311 if (OpInfo.Type == InlineAsm::isInput && !OpInfo.isIndirect)
8312 OpInfo.CallOperand =
8313 DAG.getNode(ISD::BITCAST, DL, RegVT, OpInfo.CallOperand);
8314 OpInfo.ConstraintVT = RegVT;
8315 // If the operand is an FP value and we want it in integer registers,
8316 // use the corresponding integer type. This turns an f64 value into
8317 // i64, which can be passed with two i32 values on a 32-bit machine.
8318 } else if (RegVT.isInteger() && OpInfo.ConstraintVT.isFloatingPoint()) {
8319 MVT VT = MVT::getIntegerVT(OpInfo.ConstraintVT.getSizeInBits());
8320 if (OpInfo.Type == InlineAsm::isInput)
8321 OpInfo.CallOperand =
8322 DAG.getNode(ISD::BITCAST, DL, VT, OpInfo.CallOperand);
8323 OpInfo.ConstraintVT = VT;
8324 }
8325 }
8326 }
8327
8328 // No need to allocate a matching input constraint since the constraint it's
8329 // matching to has already been allocated.
8330 if (OpInfo.isMatchingInputConstraint())
8331 return;
8332
8333 EVT ValueVT = OpInfo.ConstraintVT;
8334 if (OpInfo.ConstraintVT == MVT::Other)
8335 ValueVT = RegVT;
8336
8337 // Initialize NumRegs.
8338 unsigned NumRegs = 1;
8339 if (OpInfo.ConstraintVT != MVT::Other)
8340 NumRegs = TLI.getNumRegisters(Context, OpInfo.ConstraintVT, RegVT);
8341
8342 // If this is a constraint for a specific physical register, like {r17},
8343 // assign it now.
8344
8345 // If this associated to a specific register, initialize iterator to correct
8346 // place. If virtual, make sure we have enough registers
8347
8348 // Initialize iterator if necessary
8349 TargetRegisterClass::iterator I = RC->begin();
8350 MachineRegisterInfo &RegInfo = MF.getRegInfo();
8351
8352 // Do not check for single registers.
8353 if (AssignedReg) {
8354 for (; *I != AssignedReg; ++I)
8355 assert(I != RC->end() && "AssignedReg should be member of RC")((void)0);
8356 }
8357
8358 for (; NumRegs; --NumRegs, ++I) {
8359 assert(I != RC->end() && "Ran out of registers to allocate!")((void)0);
8360 Register R = AssignedReg ? Register(*I) : RegInfo.createVirtualRegister(RC);
8361 Regs.push_back(R);
8362 }
8363
8364 OpInfo.AssignedRegs = RegsForValue(Regs, RegVT, ValueVT);
8365}
8366
8367static unsigned
8368findMatchingInlineAsmOperand(unsigned OperandNo,
8369 const std::vector<SDValue> &AsmNodeOperands) {
8370 // Scan until we find the definition we already emitted of this operand.
8371 unsigned CurOp = InlineAsm::Op_FirstOperand;
8372 for (; OperandNo; --OperandNo) {
8373 // Advance to the next operand.
8374 unsigned OpFlag =
8375 cast<ConstantSDNode>(AsmNodeOperands[CurOp])->getZExtValue();
8376 assert((InlineAsm::isRegDefKind(OpFlag) ||((void)0)
8377 InlineAsm::isRegDefEarlyClobberKind(OpFlag) ||((void)0)
8378 InlineAsm::isMemKind(OpFlag)) &&((void)0)
8379 "Skipped past definitions?")((void)0);
8380 CurOp += InlineAsm::getNumOperandRegisters(OpFlag) + 1;
8381 }
8382 return CurOp;
8383}
8384
8385namespace {
8386
8387class ExtraFlags {
8388 unsigned Flags = 0;
8389
8390public:
8391 explicit ExtraFlags(const CallBase &Call) {
8392 const InlineAsm *IA = cast<InlineAsm>(Call.getCalledOperand());
8393 if (IA->hasSideEffects())
8394 Flags |= InlineAsm::Extra_HasSideEffects;
8395 if (IA->isAlignStack())
8396 Flags |= InlineAsm::Extra_IsAlignStack;
8397 if (Call.isConvergent())
8398 Flags |= InlineAsm::Extra_IsConvergent;
8399 Flags |= IA->getDialect() * InlineAsm::Extra_AsmDialect;
8400 }
8401
8402 void update(const TargetLowering::AsmOperandInfo &OpInfo) {
8403 // Ideally, we would only check against memory constraints. However, the
8404 // meaning of an Other constraint can be target-specific and we can't easily
8405 // reason about it. Therefore, be conservative and set MayLoad/MayStore
8406 // for Other constraints as well.
8407 if (OpInfo.ConstraintType == TargetLowering::C_Memory ||
8408 OpInfo.ConstraintType == TargetLowering::C_Other) {
8409 if (OpInfo.Type == InlineAsm::isInput)
8410 Flags |= InlineAsm::Extra_MayLoad;
8411 else if (OpInfo.Type == InlineAsm::isOutput)
8412 Flags |= InlineAsm::Extra_MayStore;
8413 else if (OpInfo.Type == InlineAsm::isClobber)
8414 Flags |= (InlineAsm::Extra_MayLoad | InlineAsm::Extra_MayStore);
8415 }
8416 }
8417
8418 unsigned get() const { return Flags; }
8419};
8420
8421} // end anonymous namespace
8422
8423/// visitInlineAsm - Handle a call to an InlineAsm object.
8424void SelectionDAGBuilder::visitInlineAsm(const CallBase &Call,
8425 const BasicBlock *EHPadBB) {
8426 const InlineAsm *IA = cast<InlineAsm>(Call.getCalledOperand());
8427
8428 /// ConstraintOperands - Information about all of the constraints.
8429 SmallVector<SDISelAsmOperandInfo, 16> ConstraintOperands;
8430
8431 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
8432 TargetLowering::AsmOperandInfoVector TargetConstraints = TLI.ParseConstraints(
8433 DAG.getDataLayout(), DAG.getSubtarget().getRegisterInfo(), Call);
8434
8435 // First Pass: Calculate HasSideEffects and ExtraFlags (AlignStack,
8436 // AsmDialect, MayLoad, MayStore).
8437 bool HasSideEffect = IA->hasSideEffects();
8438 ExtraFlags ExtraInfo(Call);
8439
8440 unsigned ArgNo = 0; // ArgNo - The argument of the CallInst.
8441 unsigned ResNo = 0; // ResNo - The result number of the next output.
8442 unsigned NumMatchingOps = 0;
8443 for (auto &T : TargetConstraints) {
8444 ConstraintOperands.push_back(SDISelAsmOperandInfo(T));
8445 SDISelAsmOperandInfo &OpInfo = ConstraintOperands.back();
8446
8447 // Compute the value type for each operand.
8448 if (OpInfo.Type == InlineAsm::isInput ||
8449 (OpInfo.Type == InlineAsm::isOutput && OpInfo.isIndirect)) {
8450 OpInfo.CallOperandVal = Call.getArgOperand(ArgNo++);
8451
8452 // Process the call argument. BasicBlocks are labels, currently appearing
8453 // only in asm's.
8454 if (isa<CallBrInst>(Call) &&
8455 ArgNo - 1 >= (cast<CallBrInst>(&Call)->getNumArgOperands() -
8456 cast<CallBrInst>(&Call)->getNumIndirectDests() -
8457 NumMatchingOps) &&
8458 (NumMatchingOps == 0 ||
8459 ArgNo - 1 < (cast<CallBrInst>(&Call)->getNumArgOperands() -
8460 NumMatchingOps))) {
8461 const auto *BA = cast<BlockAddress>(OpInfo.CallOperandVal);
8462 EVT VT = TLI.getValueType(DAG.getDataLayout(), BA->getType(), true);
8463 OpInfo.CallOperand = DAG.getTargetBlockAddress(BA, VT);
8464 } else if (const auto *BB = dyn_cast<BasicBlock>(OpInfo.CallOperandVal)) {
8465 OpInfo.CallOperand = DAG.getBasicBlock(FuncInfo.MBBMap[BB]);
8466 } else {
8467 OpInfo.CallOperand = getValue(OpInfo.CallOperandVal);
8468 }
8469
8470 EVT VT = OpInfo.getCallOperandValEVT(*DAG.getContext(), TLI,
8471 DAG.getDataLayout());
8472 OpInfo.ConstraintVT = VT.isSimple() ? VT.getSimpleVT() : MVT::Other;
8473 } else if (OpInfo.Type == InlineAsm::isOutput && !OpInfo.isIndirect) {
8474 // The return value of the call is this value. As such, there is no
8475 // corresponding argument.
8476 assert(!Call.getType()->isVoidTy() && "Bad inline asm!")((void)0);
8477 if (StructType *STy = dyn_cast<StructType>(Call.getType())) {
8478 OpInfo.ConstraintVT = TLI.getSimpleValueType(
8479 DAG.getDataLayout(), STy->getElementType(ResNo));
8480 } else {
8481 assert(ResNo == 0 && "Asm only has one result!")((void)0);
8482 OpInfo.ConstraintVT = TLI.getAsmOperandValueType(
8483 DAG.getDataLayout(), Call.getType()).getSimpleVT();
8484 }
8485 ++ResNo;
8486 } else {
8487 OpInfo.ConstraintVT = MVT::Other;
8488 }
8489
8490 if (OpInfo.hasMatchingInput())
8491 ++NumMatchingOps;
8492
8493 if (!HasSideEffect)
8494 HasSideEffect = OpInfo.hasMemory(TLI);
8495
8496 // Determine if this InlineAsm MayLoad or MayStore based on the constraints.
8497 // FIXME: Could we compute this on OpInfo rather than T?
8498
8499 // Compute the constraint code and ConstraintType to use.
8500 TLI.ComputeConstraintToUse(T, SDValue());
8501
8502 if (T.ConstraintType == TargetLowering::C_Immediate &&
8503 OpInfo.CallOperand && !isa<ConstantSDNode>(OpInfo.CallOperand))
8504 // We've delayed emitting a diagnostic like the "n" constraint because
8505 // inlining could cause an integer showing up.
8506 return emitInlineAsmError(Call, "constraint '" + Twine(T.ConstraintCode) +
8507 "' expects an integer constant "
8508 "expression");
8509
8510 ExtraInfo.update(T);
8511 }
8512
8513 // We won't need to flush pending loads if this asm doesn't touch
8514 // memory and is nonvolatile.
8515 SDValue Flag, Chain = (HasSideEffect) ? getRoot() : DAG.getRoot();
8516
8517 bool EmitEHLabels = isa<InvokeInst>(Call) && IA->canThrow();
8518 if (EmitEHLabels) {
8519 assert(EHPadBB && "InvokeInst must have an EHPadBB")((void)0);
8520 }
8521 bool IsCallBr = isa<CallBrInst>(Call);
8522
8523 if (IsCallBr || EmitEHLabels) {
8524 // If this is a callbr or invoke we need to flush pending exports since
8525 // inlineasm_br and invoke are terminators.
8526 // We need to do this before nodes are glued to the inlineasm_br node.
8527 Chain = getControlRoot();
8528 }
8529
8530 MCSymbol *BeginLabel = nullptr;
8531 if (EmitEHLabels) {
8532 Chain = lowerStartEH(Chain, EHPadBB, BeginLabel);
8533 }
8534
8535 // Second pass over the constraints: compute which constraint option to use.
8536 for (SDISelAsmOperandInfo &OpInfo : ConstraintOperands) {
8537 // If this is an output operand with a matching input operand, look up the
8538 // matching input. If their types mismatch, e.g. one is an integer, the
8539 // other is floating point, or their sizes are different, flag it as an
8540 // error.
8541 if (OpInfo.hasMatchingInput()) {
8542 SDISelAsmOperandInfo &Input = ConstraintOperands[OpInfo.MatchingInput];
8543 patchMatchingInput(OpInfo, Input, DAG);
8544 }
8545
8546 // Compute the constraint code and ConstraintType to use.
8547 TLI.ComputeConstraintToUse(OpInfo, OpInfo.CallOperand, &DAG);
8548
8549 if (OpInfo.ConstraintType == TargetLowering::C_Memory &&
8550 OpInfo.Type == InlineAsm::isClobber)
8551 continue;
8552
8553 // If this is a memory input, and if the operand is not indirect, do what we
8554 // need to provide an address for the memory input.
8555 if (OpInfo.ConstraintType == TargetLowering::C_Memory &&
8556 !OpInfo.isIndirect) {
8557 assert((OpInfo.isMultipleAlternative ||((void)0)
8558 (OpInfo.Type == InlineAsm::isInput)) &&((void)0)
8559 "Can only indirectify direct input operands!")((void)0);
8560
8561 // Memory operands really want the address of the value.
8562 Chain = getAddressForMemoryInput(Chain, getCurSDLoc(), OpInfo, DAG);
8563
8564 // There is no longer a Value* corresponding to this operand.
8565 OpInfo.CallOperandVal = nullptr;
8566
8567 // It is now an indirect operand.
8568 OpInfo.isIndirect = true;
8569 }
8570
8571 }
8572
8573 // AsmNodeOperands - The operands for the ISD::INLINEASM node.
8574 std::vector<SDValue> AsmNodeOperands;
8575 AsmNodeOperands.push_back(SDValue()); // reserve space for input chain
8576 AsmNodeOperands.push_back(DAG.getTargetExternalSymbol(
8577 IA->getAsmString().c_str(), TLI.getProgramPointerTy(DAG.getDataLayout())));
8578
8579 // If we have a !srcloc metadata node associated with it, we want to attach
8580 // this to the ultimately generated inline asm machineinstr. To do this, we
8581 // pass in the third operand as this (potentially null) inline asm MDNode.
8582 const MDNode *SrcLoc = Call.getMetadata("srcloc");
8583 AsmNodeOperands.push_back(DAG.getMDNode(SrcLoc));
8584
8585 // Remember the HasSideEffect, AlignStack, AsmDialect, MayLoad and MayStore
8586 // bits as operand 3.
8587 AsmNodeOperands.push_back(DAG.getTargetConstant(
8588 ExtraInfo.get(), getCurSDLoc(), TLI.getPointerTy(DAG.getDataLayout())));
8589
8590 // Third pass: Loop over operands to prepare DAG-level operands.. As part of
8591 // this, assign virtual and physical registers for inputs and otput.
8592 for (SDISelAsmOperandInfo &OpInfo : ConstraintOperands) {
8593 // Assign Registers.
8594 SDISelAsmOperandInfo &RefOpInfo =
8595 OpInfo.isMatchingInputConstraint()
8596 ? ConstraintOperands[OpInfo.getMatchedOperand()]
8597 : OpInfo;
8598 GetRegistersForValue(DAG, getCurSDLoc(), OpInfo, RefOpInfo);
8599
8600 auto DetectWriteToReservedRegister = [&]() {
8601 const MachineFunction &MF = DAG.getMachineFunction();
8602 const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
8603 for (unsigned Reg : OpInfo.AssignedRegs.Regs) {
8604 if (Register::isPhysicalRegister(Reg) &&
8605 TRI.isInlineAsmReadOnlyReg(MF, Reg)) {
8606 const char *RegName = TRI.getName(Reg);
8607 emitInlineAsmError(Call, "write to reserved register '" +
8608 Twine(RegName) + "'");
8609 return true;
8610 }
8611 }
8612 return false;
8613 };
8614
8615 switch (OpInfo.Type) {
8616 case InlineAsm::isOutput:
8617 if (OpInfo.ConstraintType == TargetLowering::C_Memory) {
8618 unsigned ConstraintID =
8619 TLI.getInlineAsmMemConstraint(OpInfo.ConstraintCode);
8620 assert(ConstraintID != InlineAsm::Constraint_Unknown &&((void)0)
8621 "Failed to convert memory constraint code to constraint id.")((void)0);
8622
8623 // Add information to the INLINEASM node to know about this output.
8624 unsigned OpFlags = InlineAsm::getFlagWord(InlineAsm::Kind_Mem, 1);
8625 OpFlags = InlineAsm::getFlagWordForMem(OpFlags, ConstraintID);
8626 AsmNodeOperands.push_back(DAG.getTargetConstant(OpFlags, getCurSDLoc(),
8627 MVT::i32));
8628 AsmNodeOperands.push_back(OpInfo.CallOperand);
8629 } else {
8630 // Otherwise, this outputs to a register (directly for C_Register /
8631 // C_RegisterClass, and a target-defined fashion for
8632 // C_Immediate/C_Other). Find a register that we can use.
8633 if (OpInfo.AssignedRegs.Regs.empty()) {
8634 emitInlineAsmError(
8635 Call, "couldn't allocate output register for constraint '" +
8636 Twine(OpInfo.ConstraintCode) + "'");
8637 return;
8638 }
8639
8640 if (DetectWriteToReservedRegister())
8641 return;
8642
8643 // Add information to the INLINEASM node to know that this register is
8644 // set.
8645 OpInfo.AssignedRegs.AddInlineAsmOperands(
8646 OpInfo.isEarlyClobber ? InlineAsm::Kind_RegDefEarlyClobber
8647 : InlineAsm::Kind_RegDef,
8648 false, 0, getCurSDLoc(), DAG, AsmNodeOperands);
8649 }
8650 break;
8651
8652 case InlineAsm::isInput: {
8653 SDValue InOperandVal = OpInfo.CallOperand;
8654
8655 if (OpInfo.isMatchingInputConstraint()) {
8656 // If this is required to match an output register we have already set,
8657 // just use its register.
8658 auto CurOp = findMatchingInlineAsmOperand(OpInfo.getMatchedOperand(),
8659 AsmNodeOperands);
8660 unsigned OpFlag =
8661 cast<ConstantSDNode>(AsmNodeOperands[CurOp])->getZExtValue();
8662 if (InlineAsm::isRegDefKind(OpFlag) ||
8663 InlineAsm::isRegDefEarlyClobberKind(OpFlag)) {
8664 // Add (OpFlag&0xffff)>>3 registers to MatchedRegs.
8665 if (OpInfo.isIndirect) {
8666 // This happens on gcc/testsuite/gcc.dg/pr8788-1.c
8667 emitInlineAsmError(Call, "inline asm not supported yet: "
8668 "don't know how to handle tied "
8669 "indirect register inputs");
8670 return;
8671 }
8672
8673 SmallVector<unsigned, 4> Regs;
8674 MachineFunction &MF = DAG.getMachineFunction();
8675 MachineRegisterInfo &MRI = MF.getRegInfo();
8676 const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
8677 RegisterSDNode *R = dyn_cast<RegisterSDNode>(AsmNodeOperands[CurOp+1]);
8678 Register TiedReg = R->getReg();
8679 MVT RegVT = R->getSimpleValueType(0);
8680 const TargetRegisterClass *RC =
8681 TiedReg.isVirtual() ? MRI.getRegClass(TiedReg)
8682 : RegVT != MVT::Untyped ? TLI.getRegClassFor(RegVT)
8683 : TRI.getMinimalPhysRegClass(TiedReg);
8684 unsigned NumRegs = InlineAsm::getNumOperandRegisters(OpFlag);
8685 for (unsigned i = 0; i != NumRegs; ++i)
8686 Regs.push_back(MRI.createVirtualRegister(RC));
8687
8688 RegsForValue MatchedRegs(Regs, RegVT, InOperandVal.getValueType());
8689
8690 SDLoc dl = getCurSDLoc();
8691 // Use the produced MatchedRegs object to
8692 MatchedRegs.getCopyToRegs(InOperandVal, DAG, dl, Chain, &Flag, &Call);
8693 MatchedRegs.AddInlineAsmOperands(InlineAsm::Kind_RegUse,
8694 true, OpInfo.getMatchedOperand(), dl,
8695 DAG, AsmNodeOperands);
8696 break;
8697 }
8698
8699 assert(InlineAsm::isMemKind(OpFlag) && "Unknown matching constraint!")((void)0);
8700 assert(InlineAsm::getNumOperandRegisters(OpFlag) == 1 &&((void)0)
8701 "Unexpected number of operands")((void)0);
8702 // Add information to the INLINEASM node to know about this input.
8703 // See InlineAsm.h isUseOperandTiedToDef.
8704 OpFlag = InlineAsm::convertMemFlagWordToMatchingFlagWord(OpFlag);
8705 OpFlag = InlineAsm::getFlagWordForMatchingOp(OpFlag,
8706 OpInfo.getMatchedOperand());
8707 AsmNodeOperands.push_back(DAG.getTargetConstant(
8708 OpFlag, getCurSDLoc(), TLI.getPointerTy(DAG.getDataLayout())));
8709 AsmNodeOperands.push_back(AsmNodeOperands[CurOp+1]);
8710 break;
8711 }
8712
8713 // Treat indirect 'X' constraint as memory.
8714 if (OpInfo.ConstraintType == TargetLowering::C_Other &&
8715 OpInfo.isIndirect)
8716 OpInfo.ConstraintType = TargetLowering::C_Memory;
8717
8718 if (OpInfo.ConstraintType == TargetLowering::C_Immediate ||
8719 OpInfo.ConstraintType == TargetLowering::C_Other) {
8720 std::vector<SDValue> Ops;
8721 TLI.LowerAsmOperandForConstraint(InOperandVal, OpInfo.ConstraintCode,
8722 Ops, DAG);
8723 if (Ops.empty()) {
8724 if (OpInfo.ConstraintType == TargetLowering::C_Immediate)
8725 if (isa<ConstantSDNode>(InOperandVal)) {
8726 emitInlineAsmError(Call, "value out of range for constraint '" +
8727 Twine(OpInfo.ConstraintCode) + "'");
8728 return;
8729 }
8730
8731 emitInlineAsmError(Call,
8732 "invalid operand for inline asm constraint '" +
8733 Twine(OpInfo.ConstraintCode) + "'");
8734 return;
8735 }
8736
8737 // Add information to the INLINEASM node to know about this input.
8738 unsigned ResOpType =
8739 InlineAsm::getFlagWord(InlineAsm::Kind_Imm, Ops.size());
8740 AsmNodeOperands.push_back(DAG.getTargetConstant(
8741 ResOpType, getCurSDLoc(), TLI.getPointerTy(DAG.getDataLayout())));
8742 llvm::append_range(AsmNodeOperands, Ops);
8743 break;
8744 }
8745
8746 if (OpInfo.ConstraintType == TargetLowering::C_Memory) {
8747 assert(OpInfo.isIndirect && "Operand must be indirect to be a mem!")((void)0);
8748 assert(InOperandVal.getValueType() ==((void)0)
8749 TLI.getPointerTy(DAG.getDataLayout()) &&((void)0)
8750 "Memory operands expect pointer values")((void)0);
8751
8752 unsigned ConstraintID =
8753 TLI.getInlineAsmMemConstraint(OpInfo.ConstraintCode);
8754 assert(ConstraintID != InlineAsm::Constraint_Unknown &&((void)0)
8755 "Failed to convert memory constraint code to constraint id.")((void)0);
8756
8757 // Add information to the INLINEASM node to know about this input.
8758 unsigned ResOpType = InlineAsm::getFlagWord(InlineAsm::Kind_Mem, 1);
8759 ResOpType = InlineAsm::getFlagWordForMem(ResOpType, ConstraintID);
8760 AsmNodeOperands.push_back(DAG.getTargetConstant(ResOpType,
8761 getCurSDLoc(),
8762 MVT::i32));
8763 AsmNodeOperands.push_back(InOperandVal);
8764 break;
8765 }
8766
8767 assert((OpInfo.ConstraintType == TargetLowering::C_RegisterClass ||((void)0)
8768 OpInfo.ConstraintType == TargetLowering::C_Register) &&((void)0)
8769 "Unknown constraint type!")((void)0);
8770
8771 // TODO: Support this.
8772 if (OpInfo.isIndirect) {
8773 emitInlineAsmError(
8774 Call, "Don't know how to handle indirect register inputs yet "
8775 "for constraint '" +
8776 Twine(OpInfo.ConstraintCode) + "'");
8777 return;
8778 }
8779
8780 // Copy the input into the appropriate registers.
8781 if (OpInfo.AssignedRegs.Regs.empty()) {
8782 emitInlineAsmError(Call,
8783 "couldn't allocate input reg for constraint '" +
8784 Twine(OpInfo.ConstraintCode) + "'");
8785 return;
8786 }
8787
8788 if (DetectWriteToReservedRegister())
8789 return;
8790
8791 SDLoc dl = getCurSDLoc();
8792
8793 OpInfo.AssignedRegs.getCopyToRegs(InOperandVal, DAG, dl, Chain, &Flag,
8794 &Call);
8795
8796 OpInfo.AssignedRegs.AddInlineAsmOperands(InlineAsm::Kind_RegUse, false, 0,
8797 dl, DAG, AsmNodeOperands);
8798 break;
8799 }
8800 case InlineAsm::isClobber:
8801 // Add the clobbered value to the operand list, so that the register
8802 // allocator is aware that the physreg got clobbered.
8803 if (!OpInfo.AssignedRegs.Regs.empty())
8804 OpInfo.AssignedRegs.AddInlineAsmOperands(InlineAsm::Kind_Clobber,
8805 false, 0, getCurSDLoc(), DAG,
8806 AsmNodeOperands);
8807 break;
8808 }
8809 }
8810
8811 // Finish up input operands. Set the input chain and add the flag last.
8812 AsmNodeOperands[InlineAsm::Op_InputChain] = Chain;
8813 if (Flag.getNode()) AsmNodeOperands.push_back(Flag);
8814
8815 unsigned ISDOpc = IsCallBr ? ISD::INLINEASM_BR : ISD::INLINEASM;
8816 Chain = DAG.getNode(ISDOpc, getCurSDLoc(),
8817 DAG.getVTList(MVT::Other, MVT::Glue), AsmNodeOperands);
8818 Flag = Chain.getValue(1);
8819
8820 // Do additional work to generate outputs.
8821
8822 SmallVector<EVT, 1> ResultVTs;
8823 SmallVector<SDValue, 1> ResultValues;
8824 SmallVector<SDValue, 8> OutChains;
8825
8826 llvm::Type *CallResultType = Call.getType();
8827 ArrayRef<Type *> ResultTypes;
8828 if (StructType *StructResult = dyn_cast<StructType>(CallResultType))
8829 ResultTypes = StructResult->elements();
8830 else if (!CallResultType->isVoidTy())
8831 ResultTypes = makeArrayRef(CallResultType);
8832
8833 auto CurResultType = ResultTypes.begin();
8834 auto handleRegAssign = [&](SDValue V) {
8835 assert(CurResultType != ResultTypes.end() && "Unexpected value")((void)0);
8836 assert((*CurResultType)->isSized() && "Unexpected unsized type")((void)0);
8837 EVT ResultVT = TLI.getValueType(DAG.getDataLayout(), *CurResultType);
8838 ++CurResultType;
8839 // If the type of the inline asm call site return value is different but has
8840 // same size as the type of the asm output bitcast it. One example of this
8841 // is for vectors with different width / number of elements. This can
8842 // happen for register classes that can contain multiple different value
8843 // types. The preg or vreg allocated may not have the same VT as was
8844 // expected.
8845 //
8846 // This can also happen for a return value that disagrees with the register
8847 // class it is put in, eg. a double in a general-purpose register on a
8848 // 32-bit machine.
8849 if (ResultVT != V.getValueType() &&
8850 ResultVT.getSizeInBits() == V.getValueSizeInBits())
8851 V = DAG.getNode(ISD::BITCAST, getCurSDLoc(), ResultVT, V);
8852 else if (ResultVT != V.getValueType() && ResultVT.isInteger() &&
8853 V.getValueType().isInteger()) {
8854 // If a result value was tied to an input value, the computed result
8855 // may have a wider width than the expected result. Extract the
8856 // relevant portion.
8857 V = DAG.getNode(ISD::TRUNCATE, getCurSDLoc(), ResultVT, V);
8858 }
8859 assert(ResultVT == V.getValueType() && "Asm result value mismatch!")((void)0);
8860 ResultVTs.push_back(ResultVT);
8861 ResultValues.push_back(V);
8862 };
8863
8864 // Deal with output operands.
8865 for (SDISelAsmOperandInfo &OpInfo : ConstraintOperands) {
8866 if (OpInfo.Type == InlineAsm::isOutput) {
8867 SDValue Val;
8868 // Skip trivial output operands.
8869 if (OpInfo.AssignedRegs.Regs.empty())
8870 continue;
8871
8872 switch (OpInfo.ConstraintType) {
8873 case TargetLowering::C_Register:
8874 case TargetLowering::C_RegisterClass:
8875 Val = OpInfo.AssignedRegs.getCopyFromRegs(DAG, FuncInfo, getCurSDLoc(),
8876 Chain, &Flag, &Call);
8877 break;
8878 case TargetLowering::C_Immediate:
8879 case TargetLowering::C_Other:
8880 Val = TLI.LowerAsmOutputForConstraint(Chain, Flag, getCurSDLoc(),
8881 OpInfo, DAG);
8882 break;
8883 case TargetLowering::C_Memory:
8884 break; // Already handled.
8885 case TargetLowering::C_Unknown:
8886 assert(false && "Unexpected unknown constraint")((void)0);
8887 }
8888
8889 // Indirect output manifest as stores. Record output chains.
8890 if (OpInfo.isIndirect) {
8891 const Value *Ptr = OpInfo.CallOperandVal;
8892 assert(Ptr && "Expected value CallOperandVal for indirect asm operand")((void)0);
8893 SDValue Store = DAG.getStore(Chain, getCurSDLoc(), Val, getValue(Ptr),
8894 MachinePointerInfo(Ptr));
8895 OutChains.push_back(Store);
8896 } else {
8897 // generate CopyFromRegs to associated registers.
8898 assert(!Call.getType()->isVoidTy() && "Bad inline asm!")((void)0);
8899 if (Val.getOpcode() == ISD::MERGE_VALUES) {
8900 for (const SDValue &V : Val->op_values())
8901 handleRegAssign(V);
8902 } else
8903 handleRegAssign(Val);
8904 }
8905 }
8906 }
8907
8908 // Set results.
8909 if (!ResultValues.empty()) {
8910 assert(CurResultType == ResultTypes.end() &&((void)0)
8911 "Mismatch in number of ResultTypes")((void)0);
8912 assert(ResultValues.size() == ResultTypes.size() &&((void)0)
8913 "Mismatch in number of output operands in asm result")((void)0);
8914
8915 SDValue V = DAG.getNode(ISD::MERGE_VALUES, getCurSDLoc(),
8916 DAG.getVTList(ResultVTs), ResultValues);
8917 setValue(&Call, V);
8918 }
8919
8920 // Collect store chains.
8921 if (!OutChains.empty())
8922 Chain = DAG.getNode(ISD::TokenFactor, getCurSDLoc(), MVT::Other, OutChains);
8923
8924 if (EmitEHLabels) {
8925 Chain = lowerEndEH(Chain, cast<InvokeInst>(&Call), EHPadBB, BeginLabel);
8926 }
8927
8928 // Only Update Root if inline assembly has a memory effect.
8929 if (ResultValues.empty() || HasSideEffect || !OutChains.empty() || IsCallBr ||
8930 EmitEHLabels)
8931 DAG.setRoot(Chain);
8932}
8933
8934void SelectionDAGBuilder::emitInlineAsmError(const CallBase &Call,
8935 const Twine &Message) {
8936 LLVMContext &Ctx = *DAG.getContext();
8937 Ctx.emitError(&Call, Message);
8938
8939 // Make sure we leave the DAG in a valid state
8940 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
8941 SmallVector<EVT, 1> ValueVTs;
8942 ComputeValueVTs(TLI, DAG.getDataLayout(), Call.getType(), ValueVTs);
8943
8944 if (ValueVTs.empty())
8945 return;
8946
8947 SmallVector<SDValue, 1> Ops;
8948 for (unsigned i = 0, e = ValueVTs.size(); i != e; ++i)
8949 Ops.push_back(DAG.getUNDEF(ValueVTs[i]));
8950
8951 setValue(&Call, DAG.getMergeValues(Ops, getCurSDLoc()));
8952}
8953
8954void SelectionDAGBuilder::visitVAStart(const CallInst &I) {
8955 DAG.setRoot(DAG.getNode(ISD::VASTART, getCurSDLoc(),
8956 MVT::Other, getRoot(),
8957 getValue(I.getArgOperand(0)),
8958 DAG.getSrcValue(I.getArgOperand(0))));
8959}
8960
8961void SelectionDAGBuilder::visitVAArg(const VAArgInst &I) {
8962 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
8963 const DataLayout &DL = DAG.getDataLayout();
8964 SDValue V = DAG.getVAArg(
8965 TLI.getMemValueType(DAG.getDataLayout(), I.getType()), getCurSDLoc(),
8966 getRoot(), getValue(I.getOperand(0)), DAG.getSrcValue(I.getOperand(0)),
8967 DL.getABITypeAlign(I.getType()).value());
8968 DAG.setRoot(V.getValue(1));
8969
8970 if (I.getType()->isPointerTy())
8971 V = DAG.getPtrExtOrTrunc(
8972 V, getCurSDLoc(), TLI.getValueType(DAG.getDataLayout(), I.getType()));
8973 setValue(&I, V);
8974}
8975
8976void SelectionDAGBuilder::visitVAEnd(const CallInst &I) {
8977 DAG.setRoot(DAG.getNode(ISD::VAEND, getCurSDLoc(),
8978 MVT::Other, getRoot(),
8979 getValue(I.getArgOperand(0)),
8980 DAG.getSrcValue(I.getArgOperand(0))));
8981}
8982
8983void SelectionDAGBuilder::visitVACopy(const CallInst &I) {
8984 DAG.setRoot(DAG.getNode(ISD::VACOPY, getCurSDLoc(),
8985 MVT::Other, getRoot(),
8986 getValue(I.getArgOperand(0)),
8987 getValue(I.getArgOperand(1)),
8988 DAG.getSrcValue(I.getArgOperand(0)),
8989 DAG.getSrcValue(I.getArgOperand(1))));
8990}
8991
8992SDValue SelectionDAGBuilder::lowerRangeToAssertZExt(SelectionDAG &DAG,
8993 const Instruction &I,
8994 SDValue Op) {
8995 const MDNode *Range = I.getMetadata(LLVMContext::MD_range);
8996 if (!Range)
8997 return Op;
8998
8999 ConstantRange CR = getConstantRangeFromMetadata(*Range);
9000 if (CR.isFullSet() || CR.isEmptySet() || CR.isUpperWrapped())
9001 return Op;
9002
9003 APInt Lo = CR.getUnsignedMin();
9004 if (!Lo.isMinValue())
9005 return Op;
9006
9007 APInt Hi = CR.getUnsignedMax();
9008 unsigned Bits = std::max(Hi.getActiveBits(),
9009 static_cast<unsigned>(IntegerType::MIN_INT_BITS));
9010
9011 EVT SmallVT = EVT::getIntegerVT(*DAG.getContext(), Bits);
9012
9013 SDLoc SL = getCurSDLoc();
9014
9015 SDValue ZExt = DAG.getNode(ISD::AssertZext, SL, Op.getValueType(), Op,
9016 DAG.getValueType(SmallVT));
9017 unsigned NumVals = Op.getNode()->getNumValues();
9018 if (NumVals == 1)
9019 return ZExt;
9020
9021 SmallVector<SDValue, 4> Ops;
9022
9023 Ops.push_back(ZExt);
9024 for (unsigned I = 1; I != NumVals; ++I)
9025 Ops.push_back(Op.getValue(I));
9026
9027 return DAG.getMergeValues(Ops, SL);
9028}
9029
9030/// Populate a CallLowerinInfo (into \p CLI) based on the properties of
9031/// the call being lowered.
9032///
9033/// This is a helper for lowering intrinsics that follow a target calling
9034/// convention or require stack pointer adjustment. Only a subset of the
9035/// intrinsic's operands need to participate in the calling convention.
9036void SelectionDAGBuilder::populateCallLoweringInfo(
9037 TargetLowering::CallLoweringInfo &CLI, const CallBase *Call,
9038 unsigned ArgIdx, unsigned NumArgs, SDValue Callee, Type *ReturnTy,
9039 bool IsPatchPoint) {
9040 TargetLowering::ArgListTy Args;
9041 Args.reserve(NumArgs);
9042
9043 // Populate the argument list.
9044 // Attributes for args start at offset 1, after the return attribute.
9045 for (unsigned ArgI = ArgIdx, ArgE = ArgIdx + NumArgs;
9046 ArgI != ArgE; ++ArgI) {
9047 const Value *V = Call->getOperand(ArgI);
9048
9049 assert(!V->getType()->isEmptyTy() && "Empty type passed to intrinsic.")((void)0);
9050
9051 TargetLowering::ArgListEntry Entry;
9052 Entry.Node = getValue(V);
9053 Entry.Ty = V->getType();
9054 Entry.setAttributes(Call, ArgI);
9055 Args.push_back(Entry);
9056 }
9057
9058 CLI.setDebugLoc(getCurSDLoc())
9059 .setChain(getRoot())
9060 .setCallee(Call->getCallingConv(), ReturnTy, Callee, std::move(Args))
9061 .setDiscardResult(Call->use_empty())
9062 .setIsPatchPoint(IsPatchPoint)
9063 .setIsPreallocated(
9064 Call->countOperandBundlesOfType(LLVMContext::OB_preallocated) != 0);
9065}
9066
9067/// Add a stack map intrinsic call's live variable operands to a stackmap
9068/// or patchpoint target node's operand list.
9069///
9070/// Constants are converted to TargetConstants purely as an optimization to
9071/// avoid constant materialization and register allocation.
9072///
9073/// FrameIndex operands are converted to TargetFrameIndex so that ISEL does not
9074/// generate addess computation nodes, and so FinalizeISel can convert the
9075/// TargetFrameIndex into a DirectMemRefOp StackMap location. This avoids
9076/// address materialization and register allocation, but may also be required
9077/// for correctness. If a StackMap (or PatchPoint) intrinsic directly uses an
9078/// alloca in the entry block, then the runtime may assume that the alloca's
9079/// StackMap location can be read immediately after compilation and that the
9080/// location is valid at any point during execution (this is similar to the
9081/// assumption made by the llvm.gcroot intrinsic). If the alloca's location were
9082/// only available in a register, then the runtime would need to trap when
9083/// execution reaches the StackMap in order to read the alloca's location.
9084static void addStackMapLiveVars(const CallBase &Call, unsigned StartIdx,
9085 const SDLoc &DL, SmallVectorImpl<SDValue> &Ops,
9086 SelectionDAGBuilder &Builder) {
9087 for (unsigned i = StartIdx, e = Call.arg_size(); i != e; ++i) {
9088 SDValue OpVal = Builder.getValue(Call.getArgOperand(i));
9089 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(OpVal)) {
9090 Ops.push_back(
9091 Builder.DAG.getTargetConstant(StackMaps::ConstantOp, DL, MVT::i64));
9092 Ops.push_back(
9093 Builder.DAG.getTargetConstant(C->getSExtValue(), DL, MVT::i64));
9094 } else if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(OpVal)) {
9095 const TargetLowering &TLI = Builder.DAG.getTargetLoweringInfo();
9096 Ops.push_back(Builder.DAG.getTargetFrameIndex(
9097 FI->getIndex(), TLI.getFrameIndexTy(Builder.DAG.getDataLayout())));
9098 } else
9099 Ops.push_back(OpVal);
9100 }
9101}
9102
9103/// Lower llvm.experimental.stackmap directly to its target opcode.
9104void SelectionDAGBuilder::visitStackmap(const CallInst &CI) {
9105 // void @llvm.experimental.stackmap(i32 <id>, i32 <numShadowBytes>,
9106 // [live variables...])
9107
9108 assert(CI.getType()->isVoidTy() && "Stackmap cannot return a value.")((void)0);
9109
9110 SDValue Chain, InFlag, Callee, NullPtr;
9111 SmallVector<SDValue, 32> Ops;
9112
9113 SDLoc DL = getCurSDLoc();
9114 Callee = getValue(CI.getCalledOperand());
9115 NullPtr = DAG.getIntPtrConstant(0, DL, true);
9116
9117 // The stackmap intrinsic only records the live variables (the arguments
9118 // passed to it) and emits NOPS (if requested). Unlike the patchpoint
9119 // intrinsic, this won't be lowered to a function call. This means we don't
9120 // have to worry about calling conventions and target specific lowering code.
9121 // Instead we perform the call lowering right here.
9122 //
9123 // chain, flag = CALLSEQ_START(chain, 0, 0)
9124 // chain, flag = STACKMAP(id, nbytes, ..., chain, flag)
9125 // chain, flag = CALLSEQ_END(chain, 0, 0, flag)
9126 //
9127 Chain = DAG.getCALLSEQ_START(getRoot(), 0, 0, DL);
9128 InFlag = Chain.getValue(1);
9129
9130 // Add the <id> and <numBytes> constants.
9131 SDValue IDVal = getValue(CI.getOperand(PatchPointOpers::IDPos));
9132 Ops.push_back(DAG.getTargetConstant(
9133 cast<ConstantSDNode>(IDVal)->getZExtValue(), DL, MVT::i64));
9134 SDValue NBytesVal = getValue(CI.getOperand(PatchPointOpers::NBytesPos));
9135 Ops.push_back(DAG.getTargetConstant(
9136 cast<ConstantSDNode>(NBytesVal)->getZExtValue(), DL,
9137 MVT::i32));
9138
9139 // Push live variables for the stack map.
9140 addStackMapLiveVars(CI, 2, DL, Ops, *this);
9141
9142 // We are not pushing any register mask info here on the operands list,
9143 // because the stackmap doesn't clobber anything.
9144
9145 // Push the chain and the glue flag.
9146 Ops.push_back(Chain);
9147 Ops.push_back(InFlag);
9148
9149 // Create the STACKMAP node.
9150 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
9151 SDNode *SM = DAG.getMachineNode(TargetOpcode::STACKMAP, DL, NodeTys, Ops);
9152 Chain = SDValue(SM, 0);
9153 InFlag = Chain.getValue(1);
9154
9155 Chain = DAG.getCALLSEQ_END(Chain, NullPtr, NullPtr, InFlag, DL);
9156
9157 // Stackmaps don't generate values, so nothing goes into the NodeMap.
9158
9159 // Set the root to the target-lowered call chain.
9160 DAG.setRoot(Chain);
9161
9162 // Inform the Frame Information that we have a stackmap in this function.
9163 FuncInfo.MF->getFrameInfo().setHasStackMap();
9164}
9165
9166/// Lower llvm.experimental.patchpoint directly to its target opcode.
9167void SelectionDAGBuilder::visitPatchpoint(const CallBase &CB,
9168 const BasicBlock *EHPadBB) {
9169 // void|i64 @llvm.experimental.patchpoint.void|i64(i64 <id>,
9170 // i32 <numBytes>,
9171 // i8* <target>,
9172 // i32 <numArgs>,
9173 // [Args...],
9174 // [live variables...])
9175
9176 CallingConv::ID CC = CB.getCallingConv();
9177 bool IsAnyRegCC = CC == CallingConv::AnyReg;
9178 bool HasDef = !CB.getType()->isVoidTy();
9179 SDLoc dl = getCurSDLoc();
9180 SDValue Callee = getValue(CB.getArgOperand(PatchPointOpers::TargetPos));
9181
9182 // Handle immediate and symbolic callees.
9183 if (auto* ConstCallee = dyn_cast<ConstantSDNode>(Callee))
9184 Callee = DAG.getIntPtrConstant(ConstCallee->getZExtValue(), dl,
9185 /*isTarget=*/true);
9186 else if (auto* SymbolicCallee = dyn_cast<GlobalAddressSDNode>(Callee))
9187 Callee = DAG.getTargetGlobalAddress(SymbolicCallee->getGlobal(),
9188 SDLoc(SymbolicCallee),
9189 SymbolicCallee->getValueType(0));
9190
9191 // Get the real number of arguments participating in the call <numArgs>
9192 SDValue NArgVal = getValue(CB.getArgOperand(PatchPointOpers::NArgPos));
9193 unsigned NumArgs = cast<ConstantSDNode>(NArgVal)->getZExtValue();
9194
9195 // Skip the four meta args: <id>, <numNopBytes>, <target>, <numArgs>
9196 // Intrinsics include all meta-operands up to but not including CC.
9197 unsigned NumMetaOpers = PatchPointOpers::CCPos;
9198 assert(CB.arg_size() >= NumMetaOpers + NumArgs &&((void)0)
9199 "Not enough arguments provided to the patchpoint intrinsic")((void)0);
9200
9201 // For AnyRegCC the arguments are lowered later on manually.
9202 unsigned NumCallArgs = IsAnyRegCC ? 0 : NumArgs;
9203 Type *ReturnTy =
9204 IsAnyRegCC ? Type::getVoidTy(*DAG.getContext()) : CB.getType();
9205
9206 TargetLowering::CallLoweringInfo CLI(DAG);
9207 populateCallLoweringInfo(CLI, &CB, NumMetaOpers, NumCallArgs, Callee,
9208 ReturnTy, true);
9209 std::pair<SDValue, SDValue> Result = lowerInvokable(CLI, EHPadBB);
9210
9211 SDNode *CallEnd = Result.second.getNode();
9212 if (HasDef && (CallEnd->getOpcode() == ISD::CopyFromReg))
9213 CallEnd = CallEnd->getOperand(0).getNode();
9214
9215 /// Get a call instruction from the call sequence chain.
9216 /// Tail calls are not allowed.
9217 assert(CallEnd->getOpcode() == ISD::CALLSEQ_END &&((void)0)
9218 "Expected a callseq node.")((void)0);
9219 SDNode *Call = CallEnd->getOperand(0).getNode();
9220 bool HasGlue = Call->getGluedNode();
9221
9222 // Replace the target specific call node with the patchable intrinsic.
9223 SmallVector<SDValue, 8> Ops;
9224
9225 // Add the <id> and <numBytes> constants.
9226 SDValue IDVal = getValue(CB.getArgOperand(PatchPointOpers::IDPos));
9227 Ops.push_back(DAG.getTargetConstant(
9228 cast<ConstantSDNode>(IDVal)->getZExtValue(), dl, MVT::i64));
9229 SDValue NBytesVal = getValue(CB.getArgOperand(PatchPointOpers::NBytesPos));
9230 Ops.push_back(DAG.getTargetConstant(
9231 cast<ConstantSDNode>(NBytesVal)->getZExtValue(), dl,
9232 MVT::i32));
9233
9234 // Add the callee.
9235 Ops.push_back(Callee);
9236
9237 // Adjust <numArgs> to account for any arguments that have been passed on the
9238 // stack instead.
9239 // Call Node: Chain, Target, {Args}, RegMask, [Glue]
9240 unsigned NumCallRegArgs = Call->getNumOperands() - (HasGlue ? 4 : 3);
9241 NumCallRegArgs = IsAnyRegCC ? NumArgs : NumCallRegArgs;
9242 Ops.push_back(DAG.getTargetConstant(NumCallRegArgs, dl, MVT::i32));
9243
9244 // Add the calling convention
9245 Ops.push_back(DAG.getTargetConstant((unsigned)CC, dl, MVT::i32));
9246
9247 // Add the arguments we omitted previously. The register allocator should
9248 // place these in any free register.
9249 if (IsAnyRegCC)
9250 for (unsigned i = NumMetaOpers, e = NumMetaOpers + NumArgs; i != e; ++i)
9251 Ops.push_back(getValue(CB.getArgOperand(i)));
9252
9253 // Push the arguments from the call instruction up to the register mask.
9254 SDNode::op_iterator e = HasGlue ? Call->op_end()-2 : Call->op_end()-1;
9255 Ops.append(Call->op_begin() + 2, e);
9256
9257 // Push live variables for the stack map.
9258 addStackMapLiveVars(CB, NumMetaOpers + NumArgs, dl, Ops, *this);
9259
9260 // Push the register mask info.
9261 if (HasGlue)
9262 Ops.push_back(*(Call->op_end()-2));
9263 else
9264 Ops.push_back(*(Call->op_end()-1));
9265
9266 // Push the chain (this is originally the first operand of the call, but
9267 // becomes now the last or second to last operand).
9268 Ops.push_back(*(Call->op_begin()));
9269
9270 // Push the glue flag (last operand).
9271 if (HasGlue)
9272 Ops.push_back(*(Call->op_end()-1));
9273
9274 SDVTList NodeTys;
9275 if (IsAnyRegCC && HasDef) {
9276 // Create the return types based on the intrinsic definition
9277 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
9278 SmallVector<EVT, 3> ValueVTs;
9279 ComputeValueVTs(TLI, DAG.getDataLayout(), CB.getType(), ValueVTs);
9280 assert(ValueVTs.size() == 1 && "Expected only one return value type.")((void)0);
9281
9282 // There is always a chain and a glue type at the end
9283 ValueVTs.push_back(MVT::Other);
9284 ValueVTs.push_back(MVT::Glue);
9285 NodeTys = DAG.getVTList(ValueVTs);
9286 } else
9287 NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
9288
9289 // Replace the target specific call node with a PATCHPOINT node.
9290 MachineSDNode *MN = DAG.getMachineNode(TargetOpcode::PATCHPOINT,
9291 dl, NodeTys, Ops);
9292
9293 // Update the NodeMap.
9294 if (HasDef) {
9295 if (IsAnyRegCC)
9296 setValue(&CB, SDValue(MN, 0));
9297 else
9298 setValue(&CB, Result.first);
9299 }
9300
9301 // Fixup the consumers of the intrinsic. The chain and glue may be used in the
9302 // call sequence. Furthermore the location of the chain and glue can change
9303 // when the AnyReg calling convention is used and the intrinsic returns a
9304 // value.
9305 if (IsAnyRegCC && HasDef) {
9306 SDValue From[] = {SDValue(Call, 0), SDValue(Call, 1)};
9307 SDValue To[] = {SDValue(MN, 1), SDValue(MN, 2)};
9308 DAG.ReplaceAllUsesOfValuesWith(From, To, 2);
9309 } else
9310 DAG.ReplaceAllUsesWith(Call, MN);
9311 DAG.DeleteNode(Call);
9312
9313 // Inform the Frame Information that we have a patchpoint in this function.
9314 FuncInfo.MF->getFrameInfo().setHasPatchPoint();
9315}
9316
9317void SelectionDAGBuilder::visitVectorReduce(const CallInst &I,
9318 unsigned Intrinsic) {
9319 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
9320 SDValue Op1 = getValue(I.getArgOperand(0));
9321 SDValue Op2;
9322 if (I.getNumArgOperands() > 1)
9323 Op2 = getValue(I.getArgOperand(1));
9324 SDLoc dl = getCurSDLoc();
9325 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
9326 SDValue Res;
9327 SDNodeFlags SDFlags;
9328 if (auto *FPMO = dyn_cast<FPMathOperator>(&I))
9329 SDFlags.copyFMF(*FPMO);
9330
9331 switch (Intrinsic) {
9332 case Intrinsic::vector_reduce_fadd:
9333 if (SDFlags.hasAllowReassociation())
9334 Res = DAG.getNode(ISD::FADD, dl, VT, Op1,
9335 DAG.getNode(ISD::VECREDUCE_FADD, dl, VT, Op2, SDFlags),
9336 SDFlags);
9337 else
9338 Res = DAG.getNode(ISD::VECREDUCE_SEQ_FADD, dl, VT, Op1, Op2, SDFlags);
9339 break;
9340 case Intrinsic::vector_reduce_fmul:
9341 if (SDFlags.hasAllowReassociation())
9342 Res = DAG.getNode(ISD::FMUL, dl, VT, Op1,
9343 DAG.getNode(ISD::VECREDUCE_FMUL, dl, VT, Op2, SDFlags),
9344 SDFlags);
9345 else
9346 Res = DAG.getNode(ISD::VECREDUCE_SEQ_FMUL, dl, VT, Op1, Op2, SDFlags);
9347 break;
9348 case Intrinsic::vector_reduce_add:
9349 Res = DAG.getNode(ISD::VECREDUCE_ADD, dl, VT, Op1);
9350 break;
9351 case Intrinsic::vector_reduce_mul:
9352 Res = DAG.getNode(ISD::VECREDUCE_MUL, dl, VT, Op1);
9353 break;
9354 case Intrinsic::vector_reduce_and:
9355 Res = DAG.getNode(ISD::VECREDUCE_AND, dl, VT, Op1);
9356 break;
9357 case Intrinsic::vector_reduce_or:
9358 Res = DAG.getNode(ISD::VECREDUCE_OR, dl, VT, Op1);
9359 break;
9360 case Intrinsic::vector_reduce_xor:
9361 Res = DAG.getNode(ISD::VECREDUCE_XOR, dl, VT, Op1);
9362 break;
9363 case Intrinsic::vector_reduce_smax:
9364 Res = DAG.getNode(ISD::VECREDUCE_SMAX, dl, VT, Op1);
9365 break;
9366 case Intrinsic::vector_reduce_smin:
9367 Res = DAG.getNode(ISD::VECREDUCE_SMIN, dl, VT, Op1);
9368 break;
9369 case Intrinsic::vector_reduce_umax:
9370 Res = DAG.getNode(ISD::VECREDUCE_UMAX, dl, VT, Op1);
9371 break;
9372 case Intrinsic::vector_reduce_umin:
9373 Res = DAG.getNode(ISD::VECREDUCE_UMIN, dl, VT, Op1);
9374 break;
9375 case Intrinsic::vector_reduce_fmax:
9376 Res = DAG.getNode(ISD::VECREDUCE_FMAX, dl, VT, Op1, SDFlags);
9377 break;
9378 case Intrinsic::vector_reduce_fmin:
9379 Res = DAG.getNode(ISD::VECREDUCE_FMIN, dl, VT, Op1, SDFlags);
9380 break;
9381 default:
9382 llvm_unreachable("Unhandled vector reduce intrinsic")__builtin_unreachable();
9383 }
9384 setValue(&I, Res);
9385}
9386
9387/// Returns an AttributeList representing the attributes applied to the return
9388/// value of the given call.
9389static AttributeList getReturnAttrs(TargetLowering::CallLoweringInfo &CLI) {
9390 SmallVector<Attribute::AttrKind, 2> Attrs;
9391 if (CLI.RetSExt)
9392 Attrs.push_back(Attribute::SExt);
9393 if (CLI.RetZExt)
9394 Attrs.push_back(Attribute::ZExt);
9395 if (CLI.IsInReg)
9396 Attrs.push_back(Attribute::InReg);
9397
9398 return AttributeList::get(CLI.RetTy->getContext(), AttributeList::ReturnIndex,
9399 Attrs);
9400}
9401
9402/// TargetLowering::LowerCallTo - This is the default LowerCallTo
9403/// implementation, which just calls LowerCall.
9404/// FIXME: When all targets are
9405/// migrated to using LowerCall, this hook should be integrated into SDISel.
9406std::pair<SDValue, SDValue>
9407TargetLowering::LowerCallTo(TargetLowering::CallLoweringInfo &CLI) const {
9408 // Handle the incoming return values from the call.
9409 CLI.Ins.clear();
9410 Type *OrigRetTy = CLI.RetTy;
9411 SmallVector<EVT, 4> RetTys;
9412 SmallVector<uint64_t, 4> Offsets;
9413 auto &DL = CLI.DAG.getDataLayout();
9414 ComputeValueVTs(*this, DL, CLI.RetTy, RetTys, &Offsets);
9415
9416 if (CLI.IsPostTypeLegalization) {
9417 // If we are lowering a libcall after legalization, split the return type.
9418 SmallVector<EVT, 4> OldRetTys;
9419 SmallVector<uint64_t, 4> OldOffsets;
9420 RetTys.swap(OldRetTys);
9421 Offsets.swap(OldOffsets);
9422
9423 for (size_t i = 0, e = OldRetTys.size(); i != e; ++i) {
9424 EVT RetVT = OldRetTys[i];
9425 uint64_t Offset = OldOffsets[i];
9426 MVT RegisterVT = getRegisterType(CLI.RetTy->getContext(), RetVT);
9427 unsigned NumRegs = getNumRegisters(CLI.RetTy->getContext(), RetVT);
9428 unsigned RegisterVTByteSZ = RegisterVT.getSizeInBits() / 8;
9429 RetTys.append(NumRegs, RegisterVT);
9430 for (unsigned j = 0; j != NumRegs; ++j)
9431 Offsets.push_back(Offset + j * RegisterVTByteSZ);
9432 }
9433 }
9434
9435 SmallVector<ISD::OutputArg, 4> Outs;
9436 GetReturnInfo(CLI.CallConv, CLI.RetTy, getReturnAttrs(CLI), Outs, *this, DL);
9437
9438 bool CanLowerReturn =
9439 this->CanLowerReturn(CLI.CallConv, CLI.DAG.getMachineFunction(),
9440 CLI.IsVarArg, Outs, CLI.RetTy->getContext());
9441
9442 SDValue DemoteStackSlot;
9443 int DemoteStackIdx = -100;
9444 if (!CanLowerReturn) {
9445 // FIXME: equivalent assert?
9446 // assert(!CS.hasInAllocaArgument() &&
9447 // "sret demotion is incompatible with inalloca");
9448 uint64_t TySize = DL.getTypeAllocSize(CLI.RetTy);
9449 Align Alignment = DL.getPrefTypeAlign(CLI.RetTy);
9450 MachineFunction &MF = CLI.DAG.getMachineFunction();
9451 DemoteStackIdx =
9452 MF.getFrameInfo().CreateStackObject(TySize, Alignment, false);
9453 Type *StackSlotPtrType = PointerType::get(CLI.RetTy,
9454 DL.getAllocaAddrSpace());
9455
9456 DemoteStackSlot = CLI.DAG.getFrameIndex(DemoteStackIdx, getFrameIndexTy(DL));
9457 ArgListEntry Entry;
9458 Entry.Node = DemoteStackSlot;
9459 Entry.Ty = StackSlotPtrType;
9460 Entry.IsSExt = false;
9461 Entry.IsZExt = false;
9462 Entry.IsInReg = false;
9463 Entry.IsSRet = true;
9464 Entry.IsNest = false;
9465 Entry.IsByVal = false;
9466 Entry.IsByRef = false;
9467 Entry.IsReturned = false;
9468 Entry.IsSwiftSelf = false;
9469 Entry.IsSwiftAsync = false;
9470 Entry.IsSwiftError = false;
9471 Entry.IsCFGuardTarget = false;
9472 Entry.Alignment = Alignment;
9473 CLI.getArgs().insert(CLI.getArgs().begin(), Entry);
9474 CLI.NumFixedArgs += 1;
9475 CLI.RetTy = Type::getVoidTy(CLI.RetTy->getContext());
9476
9477 // sret demotion isn't compatible with tail-calls, since the sret argument
9478 // points into the callers stack frame.
9479 CLI.IsTailCall = false;
9480 } else {
9481 bool NeedsRegBlock = functionArgumentNeedsConsecutiveRegisters(
9482 CLI.RetTy, CLI.CallConv, CLI.IsVarArg, DL);
9483 for (unsigned I = 0, E = RetTys.size(); I != E; ++I) {
9484 ISD::ArgFlagsTy Flags;
9485 if (NeedsRegBlock) {
9486 Flags.setInConsecutiveRegs();
9487 if (I == RetTys.size() - 1)
9488 Flags.setInConsecutiveRegsLast();
9489 }
9490 EVT VT = RetTys[I];
9491 MVT RegisterVT = getRegisterTypeForCallingConv(CLI.RetTy->getContext(),
9492 CLI.CallConv, VT);
9493 unsigned NumRegs = getNumRegistersForCallingConv(CLI.RetTy->getContext(),
9494 CLI.CallConv, VT);
9495 for (unsigned i = 0; i != NumRegs; ++i) {
9496 ISD::InputArg MyFlags;
9497 MyFlags.Flags = Flags;
9498 MyFlags.VT = RegisterVT;
9499 MyFlags.ArgVT = VT;
9500 MyFlags.Used = CLI.IsReturnValueUsed;
9501 if (CLI.RetTy->isPointerTy()) {
9502 MyFlags.Flags.setPointer();
9503 MyFlags.Flags.setPointerAddrSpace(
9504 cast<PointerType>(CLI.RetTy)->getAddressSpace());
9505 }
9506 if (CLI.RetSExt)
9507 MyFlags.Flags.setSExt();
9508 if (CLI.RetZExt)
9509 MyFlags.Flags.setZExt();
9510 if (CLI.IsInReg)
9511 MyFlags.Flags.setInReg();
9512 CLI.Ins.push_back(MyFlags);
9513 }
9514 }
9515 }
9516
9517 // We push in swifterror return as the last element of CLI.Ins.
9518 ArgListTy &Args = CLI.getArgs();
9519 if (supportSwiftError()) {
9520 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
9521 if (Args[i].IsSwiftError) {
9522 ISD::InputArg MyFlags;
9523 MyFlags.VT = getPointerTy(DL);
9524 MyFlags.ArgVT = EVT(getPointerTy(DL));
9525 MyFlags.Flags.setSwiftError();
9526 CLI.Ins.push_back(MyFlags);
9527 }
9528 }
9529 }
9530
9531 // Handle all of the outgoing arguments.
9532 CLI.Outs.clear();
9533 CLI.OutVals.clear();
9534 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
9535 SmallVector<EVT, 4> ValueVTs;
9536 ComputeValueVTs(*this, DL, Args[i].Ty, ValueVTs);
9537 // FIXME: Split arguments if CLI.IsPostTypeLegalization
9538 Type *FinalType = Args[i].Ty;
9539 if (Args[i].IsByVal)
9540 FinalType = Args[i].IndirectType;
9541 bool NeedsRegBlock = functionArgumentNeedsConsecutiveRegisters(
9542 FinalType, CLI.CallConv, CLI.IsVarArg, DL);
9543 for (unsigned Value = 0, NumValues = ValueVTs.size(); Value != NumValues;
9544 ++Value) {
9545 EVT VT = ValueVTs[Value];
9546 Type *ArgTy = VT.getTypeForEVT(CLI.RetTy->getContext());
9547 SDValue Op = SDValue(Args[i].Node.getNode(),
9548 Args[i].Node.getResNo() + Value);
9549 ISD::ArgFlagsTy Flags;
9550
9551 // Certain targets (such as MIPS), may have a different ABI alignment
9552 // for a type depending on the context. Give the target a chance to
9553 // specify the alignment it wants.
9554 const Align OriginalAlignment(getABIAlignmentForCallingConv(ArgTy, DL));
9555 Flags.setOrigAlign(OriginalAlignment);
9556
9557 if (Args[i].Ty->isPointerTy()) {
9558 Flags.setPointer();
9559 Flags.setPointerAddrSpace(
9560 cast<PointerType>(Args[i].Ty)->getAddressSpace());
9561 }
9562 if (Args[i].IsZExt)
9563 Flags.setZExt();
9564 if (Args[i].IsSExt)
9565 Flags.setSExt();
9566 if (Args[i].IsInReg) {
9567 // If we are using vectorcall calling convention, a structure that is
9568 // passed InReg - is surely an HVA
9569 if (CLI.CallConv == CallingConv::X86_VectorCall &&
9570 isa<StructType>(FinalType)) {
9571 // The first value of a structure is marked
9572 if (0 == Value)
9573 Flags.setHvaStart();
9574 Flags.setHva();
9575 }
9576 // Set InReg Flag
9577 Flags.setInReg();
9578 }
9579 if (Args[i].IsSRet)
9580 Flags.setSRet();
9581 if (Args[i].IsSwiftSelf)
9582 Flags.setSwiftSelf();
9583 if (Args[i].IsSwiftAsync)
9584 Flags.setSwiftAsync();
9585 if (Args[i].IsSwiftError)
9586 Flags.setSwiftError();
9587 if (Args[i].IsCFGuardTarget)
9588 Flags.setCFGuardTarget();
9589 if (Args[i].IsByVal)
9590 Flags.setByVal();
9591 if (Args[i].IsByRef)
9592 Flags.setByRef();
9593 if (Args[i].IsPreallocated) {
9594 Flags.setPreallocated();
9595 // Set the byval flag for CCAssignFn callbacks that don't know about
9596 // preallocated. This way we can know how many bytes we should've
9597 // allocated and how many bytes a callee cleanup function will pop. If
9598 // we port preallocated to more targets, we'll have to add custom
9599 // preallocated handling in the various CC lowering callbacks.
9600 Flags.setByVal();
9601 }
9602 if (Args[i].IsInAlloca) {
9603 Flags.setInAlloca();
9604 // Set the byval flag for CCAssignFn callbacks that don't know about
9605 // inalloca. This way we can know how many bytes we should've allocated
9606 // and how many bytes a callee cleanup function will pop. If we port
9607 // inalloca to more targets, we'll have to add custom inalloca handling
9608 // in the various CC lowering callbacks.
9609 Flags.setByVal();
9610 }
9611 Align MemAlign;
9612 if (Args[i].IsByVal || Args[i].IsInAlloca || Args[i].IsPreallocated) {
9613 unsigned FrameSize = DL.getTypeAllocSize(Args[i].IndirectType);
9614 Flags.setByValSize(FrameSize);
9615
9616 // info is not there but there are cases it cannot get right.
9617 if (auto MA = Args[i].Alignment)
9618 MemAlign = *MA;
9619 else
9620 MemAlign = Align(getByValTypeAlignment(Args[i].IndirectType, DL));
9621 } else if (auto MA = Args[i].Alignment) {
9622 MemAlign = *MA;
9623 } else {
9624 MemAlign = OriginalAlignment;
9625 }
9626 Flags.setMemAlign(MemAlign);
9627 if (Args[i].IsNest)
9628 Flags.setNest();
9629 if (NeedsRegBlock)
9630 Flags.setInConsecutiveRegs();
9631
9632 MVT PartVT = getRegisterTypeForCallingConv(CLI.RetTy->getContext(),
9633 CLI.CallConv, VT);
9634 unsigned NumParts = getNumRegistersForCallingConv(CLI.RetTy->getContext(),
9635 CLI.CallConv, VT);
9636 SmallVector<SDValue, 4> Parts(NumParts);
9637 ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
9638
9639 if (Args[i].IsSExt)
9640 ExtendKind = ISD::SIGN_EXTEND;
9641 else if (Args[i].IsZExt)
9642 ExtendKind = ISD::ZERO_EXTEND;
9643
9644 // Conservatively only handle 'returned' on non-vectors that can be lowered,
9645 // for now.
9646 if (Args[i].IsReturned && !Op.getValueType().isVector() &&
9647 CanLowerReturn) {
9648 assert((CLI.RetTy == Args[i].Ty ||((void)0)
9649 (CLI.RetTy->isPointerTy() && Args[i].Ty->isPointerTy() &&((void)0)
9650 CLI.RetTy->getPointerAddressSpace() ==((void)0)
9651 Args[i].Ty->getPointerAddressSpace())) &&((void)0)
9652 RetTys.size() == NumValues && "unexpected use of 'returned'")((void)0);
9653 // Before passing 'returned' to the target lowering code, ensure that
9654 // either the register MVT and the actual EVT are the same size or that
9655 // the return value and argument are extended in the same way; in these
9656 // cases it's safe to pass the argument register value unchanged as the
9657 // return register value (although it's at the target's option whether
9658 // to do so)
9659 // TODO: allow code generation to take advantage of partially preserved
9660 // registers rather than clobbering the entire register when the
9661 // parameter extension method is not compatible with the return
9662 // extension method
9663 if ((NumParts * PartVT.getSizeInBits() == VT.getSizeInBits()) ||
9664 (ExtendKind != ISD::ANY_EXTEND && CLI.RetSExt == Args[i].IsSExt &&
9665 CLI.RetZExt == Args[i].IsZExt))
9666 Flags.setReturned();
9667 }
9668
9669 getCopyToParts(CLI.DAG, CLI.DL, Op, &Parts[0], NumParts, PartVT, CLI.CB,
9670 CLI.CallConv, ExtendKind);
9671
9672 for (unsigned j = 0; j != NumParts; ++j) {
9673 // if it isn't first piece, alignment must be 1
9674 // For scalable vectors the scalable part is currently handled
9675 // by individual targets, so we just use the known minimum size here.
9676 ISD::OutputArg MyFlags(Flags, Parts[j].getValueType(), VT,
9677 i < CLI.NumFixedArgs, i,
9678 j*Parts[j].getValueType().getStoreSize().getKnownMinSize());
9679 if (NumParts > 1 && j == 0)
9680 MyFlags.Flags.setSplit();
9681 else if (j != 0) {
9682 MyFlags.Flags.setOrigAlign(Align(1));
9683 if (j == NumParts - 1)
9684 MyFlags.Flags.setSplitEnd();
9685 }
9686
9687 CLI.Outs.push_back(MyFlags);
9688 CLI.OutVals.push_back(Parts[j]);
9689 }
9690
9691 if (NeedsRegBlock && Value == NumValues - 1)
9692 CLI.Outs[CLI.Outs.size() - 1].Flags.setInConsecutiveRegsLast();
9693 }
9694 }
9695
9696 SmallVector<SDValue, 4> InVals;
9697 CLI.Chain = LowerCall(CLI, InVals);
9698
9699 // Update CLI.InVals to use outside of this function.
9700 CLI.InVals = InVals;
9701
9702 // Verify that the target's LowerCall behaved as expected.
9703 assert(CLI.Chain.getNode() && CLI.Chain.getValueType() == MVT::Other &&((void)0)
9704 "LowerCall didn't return a valid chain!")((void)0);
9705 assert((!CLI.IsTailCall || InVals.empty()) &&((void)0)
9706 "LowerCall emitted a return value for a tail call!")((void)0);
9707 assert((CLI.IsTailCall || InVals.size() == CLI.Ins.size()) &&((void)0)
9708 "LowerCall didn't emit the correct number of values!")((void)0);
9709
9710 // For a tail call, the return value is merely live-out and there aren't
9711 // any nodes in the DAG representing it. Return a special value to
9712 // indicate that a tail call has been emitted and no more Instructions
9713 // should be processed in the current block.
9714 if (CLI.IsTailCall) {
9715 CLI.DAG.setRoot(CLI.Chain);
9716 return std::make_pair(SDValue(), SDValue());
9717 }
9718
9719#ifndef NDEBUG1
9720 for (unsigned i = 0, e = CLI.Ins.size(); i != e; ++i) {
9721 assert(InVals[i].getNode() && "LowerCall emitted a null value!")((void)0);
9722 assert(EVT(CLI.Ins[i].VT) == InVals[i].getValueType() &&((void)0)
9723 "LowerCall emitted a value with the wrong type!")((void)0);
9724 }
9725#endif
9726
9727 SmallVector<SDValue, 4> ReturnValues;
9728 if (!CanLowerReturn) {
9729 // The instruction result is the result of loading from the
9730 // hidden sret parameter.
9731 SmallVector<EVT, 1> PVTs;
9732 Type *PtrRetTy = OrigRetTy->getPointerTo(DL.getAllocaAddrSpace());
9733
9734 ComputeValueVTs(*this, DL, PtrRetTy, PVTs);
9735 assert(PVTs.size() == 1 && "Pointers should fit in one register")((void)0);
9736 EVT PtrVT = PVTs[0];
9737
9738 unsigned NumValues = RetTys.size();
9739 ReturnValues.resize(NumValues);
9740 SmallVector<SDValue, 4> Chains(NumValues);
9741
9742 // An aggregate return value cannot wrap around the address space, so
9743 // offsets to its parts don't wrap either.
9744 SDNodeFlags Flags;
9745 Flags.setNoUnsignedWrap(true);
9746
9747 MachineFunction &MF = CLI.DAG.getMachineFunction();
9748 Align HiddenSRetAlign = MF.getFrameInfo().getObjectAlign(DemoteStackIdx);
9749 for (unsigned i = 0; i < NumValues; ++i) {
9750 SDValue Add = CLI.DAG.getNode(ISD::ADD, CLI.DL, PtrVT, DemoteStackSlot,
9751 CLI.DAG.getConstant(Offsets[i], CLI.DL,
9752 PtrVT), Flags);
9753 SDValue L = CLI.DAG.getLoad(
9754 RetTys[i], CLI.DL, CLI.Chain, Add,
9755 MachinePointerInfo::getFixedStack(CLI.DAG.getMachineFunction(),
9756 DemoteStackIdx, Offsets[i]),
9757 HiddenSRetAlign);
9758 ReturnValues[i] = L;
9759 Chains[i] = L.getValue(1);
9760 }
9761
9762 CLI.Chain = CLI.DAG.getNode(ISD::TokenFactor, CLI.DL, MVT::Other, Chains);
9763 } else {
9764 // Collect the legal value parts into potentially illegal values
9765 // that correspond to the original function's return values.
9766 Optional<ISD::NodeType> AssertOp;
9767 if (CLI.RetSExt)
9768 AssertOp = ISD::AssertSext;
9769 else if (CLI.RetZExt)
9770 AssertOp = ISD::AssertZext;
9771 unsigned CurReg = 0;
9772 for (unsigned I = 0, E = RetTys.size(); I != E; ++I) {
9773 EVT VT = RetTys[I];
9774 MVT RegisterVT = getRegisterTypeForCallingConv(CLI.RetTy->getContext(),
9775 CLI.CallConv, VT);
9776 unsigned NumRegs = getNumRegistersForCallingConv(CLI.RetTy->getContext(),
9777 CLI.CallConv, VT);
9778
9779 ReturnValues.push_back(getCopyFromParts(CLI.DAG, CLI.DL, &InVals[CurReg],
9780 NumRegs, RegisterVT, VT, nullptr,
9781 CLI.CallConv, AssertOp));
9782 CurReg += NumRegs;
9783 }
9784
9785 // For a function returning void, there is no return value. We can't create
9786 // such a node, so we just return a null return value in that case. In
9787 // that case, nothing will actually look at the value.
9788 if (ReturnValues.empty())
9789 return std::make_pair(SDValue(), CLI.Chain);
9790 }
9791
9792 SDValue Res = CLI.DAG.getNode(ISD::MERGE_VALUES, CLI.DL,
9793 CLI.DAG.getVTList(RetTys), ReturnValues);
9794 return std::make_pair(Res, CLI.Chain);
9795}
9796
9797/// Places new result values for the node in Results (their number
9798/// and types must exactly match those of the original return values of
9799/// the node), or leaves Results empty, which indicates that the node is not
9800/// to be custom lowered after all.
9801void TargetLowering::LowerOperationWrapper(SDNode *N,
9802 SmallVectorImpl<SDValue> &Results,
9803 SelectionDAG &DAG) const {
9804 SDValue Res = LowerOperation(SDValue(N, 0), DAG);
9805
9806 if (!Res.getNode())
9807 return;
9808
9809 // If the original node has one result, take the return value from
9810 // LowerOperation as is. It might not be result number 0.
9811 if (N->getNumValues() == 1) {
9812 Results.push_back(Res);
9813 return;
9814 }
9815
9816 // If the original node has multiple results, then the return node should
9817 // have the same number of results.
9818 assert((N->getNumValues() == Res->getNumValues()) &&((void)0)
9819 "Lowering returned the wrong number of results!")((void)0);
9820
9821 // Places new result values base on N result number.
9822 for (unsigned I = 0, E = N->getNumValues(); I != E; ++I)
9823 Results.push_back(Res.getValue(I));
9824}
9825
9826SDValue TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
9827 llvm_unreachable("LowerOperation not implemented for this target!")__builtin_unreachable();
9828}
9829
9830void
9831SelectionDAGBuilder::CopyValueToVirtualRegister(const Value *V, unsigned Reg) {
9832 SDValue Op = getNonRegisterValue(V);
9833 assert((Op.getOpcode() != ISD::CopyFromReg ||((void)0)
9834 cast<RegisterSDNode>(Op.getOperand(1))->getReg() != Reg) &&((void)0)
9835 "Copy from a reg to the same reg!")((void)0);
9836 assert(!Register::isPhysicalRegister(Reg) && "Is a physreg")((void)0);
9837
9838 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
9839 // If this is an InlineAsm we have to match the registers required, not the
9840 // notional registers required by the type.
9841
9842 RegsForValue RFV(V->getContext(), TLI, DAG.getDataLayout(), Reg, V->getType(),
9843 None); // This is not an ABI copy.
9844 SDValue Chain = DAG.getEntryNode();
9845
9846 ISD::NodeType ExtendType = (FuncInfo.PreferredExtendType.find(V) ==
15
←
'?' condition is false
→
9847 FuncInfo.PreferredExtendType.end())
9848 ? ISD::ANY_EXTEND
9849 : FuncInfo.PreferredExtendType[V];
9850 RFV.getCopyToRegs(Op, DAG, getCurSDLoc(), Chain, nullptr, V, ExtendType);
16
←
Calling 'RegsForValue::getCopyToRegs'
→
9851 PendingExports.push_back(Chain);
9852}
9853
9854#include "llvm/CodeGen/SelectionDAGISel.h"
9855
9856/// isOnlyUsedInEntryBlock - If the specified argument is only used in the
9857/// entry block, return true. This includes arguments used by switches, since
9858/// the switch may expand into multiple basic blocks.
9859static bool isOnlyUsedInEntryBlock(const Argument *A, bool FastISel) {
9860 // With FastISel active, we may be splitting blocks, so force creation
9861 // of virtual registers for all non-dead arguments.
9862 if (FastISel)
9863 return A->use_empty();
9864
9865 const BasicBlock &Entry = A->getParent()->front();
9866 for (const User *U : A->users())
9867 if (cast<Instruction>(U)->getParent() != &Entry || isa<SwitchInst>(U))
9868 return false; // Use not in entry block.
9869
9870 return true;
9871}
9872
9873using ArgCopyElisionMapTy =
9874 DenseMap<const Argument *,
9875 std::pair<const AllocaInst *, const StoreInst *>>;
9876
9877/// Scan the entry block of the function in FuncInfo for arguments that look
9878/// like copies into a local alloca. Record any copied arguments in
9879/// ArgCopyElisionCandidates.
9880static void
9881findArgumentCopyElisionCandidates(const DataLayout &DL,
9882 FunctionLoweringInfo *FuncInfo,
9883 ArgCopyElisionMapTy &ArgCopyElisionCandidates) {
9884 // Record the state of every static alloca used in the entry block. Argument
9885 // allocas are all used in the entry block, so we need approximately as many
9886 // entries as we have arguments.
9887 enum StaticAllocaInfo { Unknown, Clobbered, Elidable };
9888 SmallDenseMap<const AllocaInst *, StaticAllocaInfo, 8> StaticAllocas;
9889 unsigned NumArgs = FuncInfo->Fn->arg_size();
9890 StaticAllocas.reserve(NumArgs * 2);
9891
9892 auto GetInfoIfStaticAlloca = [&](const Value *V) -> StaticAllocaInfo * {
9893 if (!V)
9894 return nullptr;
9895 V = V->stripPointerCasts();
9896 const auto *AI = dyn_cast<AllocaInst>(V);
9897 if (!AI || !AI->isStaticAlloca() || !FuncInfo->StaticAllocaMap.count(AI))
9898 return nullptr;
9899 auto Iter = StaticAllocas.insert({AI, Unknown});
9900 return &Iter.first->second;
9901 };
9902
9903 // Look for stores of arguments to static allocas. Look through bitcasts and
9904 // GEPs to handle type coercions, as long as the alloca is fully initialized
9905 // by the store. Any non-store use of an alloca escapes it and any subsequent
9906 // unanalyzed store might write it.
9907 // FIXME: Handle structs initialized with multiple stores.
9908 for (const Instruction &I : FuncInfo->Fn->getEntryBlock()) {
9909 // Look for stores, and handle non-store uses conservatively.
9910 const auto *SI = dyn_cast<StoreInst>(&I);
9911 if (!SI) {
9912 // We will look through cast uses, so ignore them completely.
9913 if (I.isCast())
9914 continue;
9915 // Ignore debug info and pseudo op intrinsics, they don't escape or store
9916 // to allocas.
9917 if (I.isDebugOrPseudoInst())
9918 continue;
9919 // This is an unknown instruction. Assume it escapes or writes to all
9920 // static alloca operands.
9921 for (const Use &U : I.operands()) {
9922 if (StaticAllocaInfo *Info = GetInfoIfStaticAlloca(U))
9923 *Info = StaticAllocaInfo::Clobbered;
9924 }
9925 continue;
9926 }
9927
9928 // If the stored value is a static alloca, mark it as escaped.
9929 if (StaticAllocaInfo *Info = GetInfoIfStaticAlloca(SI->getValueOperand()))
9930 *Info = StaticAllocaInfo::Clobbered;
9931
9932 // Check if the destination is a static alloca.
9933 const Value *Dst = SI->getPointerOperand()->stripPointerCasts();
9934 StaticAllocaInfo *Info = GetInfoIfStaticAlloca(Dst);
9935 if (!Info)
9936 continue;
9937 const AllocaInst *AI = cast<AllocaInst>(Dst);
9938
9939 // Skip allocas that have been initialized or clobbered.
9940 if (*Info != StaticAllocaInfo::Unknown)
9941 continue;
9942
9943 // Check if the stored value is an argument, and that this store fully
9944 // initializes the alloca.
9945 // If the argument type has padding bits we can't directly forward a pointer
9946 // as the upper bits may contain garbage.
9947 // Don't elide copies from the same argument twice.
9948 const Value *Val = SI->getValueOperand()->stripPointerCasts();
9949 const auto *Arg = dyn_cast<Argument>(Val);
9950 if (!Arg || Arg->hasPassPointeeByValueCopyAttr() ||
9951 Arg->getType()->isEmptyTy() ||
9952 DL.getTypeStoreSize(Arg->getType()) !=
9953 DL.getTypeAllocSize(AI->getAllocatedType()) ||
9954 !DL.typeSizeEqualsStoreSize(Arg->getType()) ||
9955 ArgCopyElisionCandidates.count(Arg)) {
9956 *Info = StaticAllocaInfo::Clobbered;
9957 continue;
9958 }
9959
9960 LLVM_DEBUG(dbgs() << "Found argument copy elision candidate: " << *AIdo { } while (false)
9961 << '\n')do { } while (false);
9962
9963 // Mark this alloca and store for argument copy elision.
9964 *Info = StaticAllocaInfo::Elidable;
9965 ArgCopyElisionCandidates.insert({Arg, {AI, SI}});
9966
9967 // Stop scanning if we've seen all arguments. This will happen early in -O0
9968 // builds, which is useful, because -O0 builds have large entry blocks and
9969 // many allocas.
9970 if (ArgCopyElisionCandidates.size() == NumArgs)
9971 break;
9972 }
9973}
9974
9975/// Try to elide argument copies from memory into a local alloca. Succeeds if
9976/// ArgVal is a load from a suitable fixed stack object.
9977static void tryToElideArgumentCopy(
9978 FunctionLoweringInfo &FuncInfo, SmallVectorImpl<SDValue> &Chains,
9979 DenseMap<int, int> &ArgCopyElisionFrameIndexMap,
9980 SmallPtrSetImpl<const Instruction *> &ElidedArgCopyInstrs,
9981 ArgCopyElisionMapTy &ArgCopyElisionCandidates, const Argument &Arg,
9982 SDValue ArgVal, bool &ArgHasUses) {
9983 // Check if this is a load from a fixed stack object.
9984 auto *LNode = dyn_cast<LoadSDNode>(ArgVal);
9985 if (!LNode)
9986 return;
9987 auto *FINode = dyn_cast<FrameIndexSDNode>(LNode->getBasePtr().getNode());
9988 if (!FINode)
9989 return;
9990
9991 // Check that the fixed stack object is the right size and alignment.
9992 // Look at the alignment that the user wrote on the alloca instead of looking
9993 // at the stack object.
9994 auto ArgCopyIter = ArgCopyElisionCandidates.find(&Arg);
9995 assert(ArgCopyIter != ArgCopyElisionCandidates.end())((void)0);
9996 const AllocaInst *AI = ArgCopyIter->second.first;
9997 int FixedIndex = FINode->getIndex();
9998 int &AllocaIndex = FuncInfo.StaticAllocaMap[AI];
9999 int OldIndex = AllocaIndex;
10000 MachineFrameInfo &MFI = FuncInfo.MF->getFrameInfo();
10001 if (MFI.getObjectSize(FixedIndex) != MFI.getObjectSize(OldIndex)) {
10002 LLVM_DEBUG(do { } while (false)
10003 dbgs() << " argument copy elision failed due to bad fixed stack "do { } while (false)
10004 "object size\n")do { } while (false);
10005 return;
10006 }
10007 Align RequiredAlignment = AI->getAlign();
10008 if (MFI.getObjectAlign(FixedIndex) < RequiredAlignment) {
10009 LLVM_DEBUG(dbgs() << " argument copy elision failed: alignment of alloca "do { } while (false)
10010 "greater than stack argument alignment ("do { } while (false)
10011 << DebugStr(RequiredAlignment) << " vs "do { } while (false)
10012 << DebugStr(MFI.getObjectAlign(FixedIndex)) << ")\n")do { } while (false);
10013 return;
10014 }
10015
10016 // Perform the elision. Delete the old stack object and replace its only use
10017 // in the variable info map. Mark the stack object as mutable.
10018 LLVM_DEBUG({do { } while (false)
10019 dbgs() << "Eliding argument copy from " << Arg << " to " << *AI << '\n'do { } while (false)
10020 << " Replacing frame index " << OldIndex << " with " << FixedIndexdo { } while (false)
10021 << '\n';do { } while (false)
10022 })do { } while (false);
10023 MFI.RemoveStackObject(OldIndex);
10024 MFI.setIsImmutableObjectIndex(FixedIndex, false);
10025 AllocaIndex = FixedIndex;
10026 ArgCopyElisionFrameIndexMap.insert({OldIndex, FixedIndex});
10027 Chains.push_back(ArgVal.getValue(1));
10028
10029 // Avoid emitting code for the store implementing the copy.
10030 const StoreInst *SI = ArgCopyIter->second.second;
10031 ElidedArgCopyInstrs.insert(SI);
10032
10033 // Check for uses of the argument again so that we can avoid exporting ArgVal
10034 // if it is't used by anything other than the store.
10035 for (const Value *U : Arg.users()) {
10036 if (U != SI) {
10037 ArgHasUses = true;
10038 break;
10039 }
10040 }
10041}
10042
10043void SelectionDAGISel::LowerArguments(const Function &F) {
10044 SelectionDAG &DAG = SDB->DAG;
10045 SDLoc dl = SDB->getCurSDLoc();
10046 const DataLayout &DL = DAG.getDataLayout();
10047 SmallVector<ISD::InputArg, 16> Ins;
10048
10049 // In Naked functions we aren't going to save any registers.
10050 if (F.hasFnAttribute(Attribute::Naked))
10051 return;
10052
10053 if (!FuncInfo->CanLowerReturn) {
10054 // Put in an sret pointer parameter before all the other parameters.
10055 SmallVector<EVT, 1> ValueVTs;
10056 ComputeValueVTs(*TLI, DAG.getDataLayout(),
10057 F.getReturnType()->getPointerTo(
10058 DAG.getDataLayout().getAllocaAddrSpace()),
10059 ValueVTs);
10060
10061 // NOTE: Assuming that a pointer will never break down to more than one VT
10062 // or one register.
10063 ISD::ArgFlagsTy Flags;
10064 Flags.setSRet();
10065 MVT RegisterVT = TLI->getRegisterType(*DAG.getContext(), ValueVTs[0]);
10066 ISD::InputArg RetArg(Flags, RegisterVT, ValueVTs[0], true,
10067 ISD::InputArg::NoArgIndex, 0);
10068 Ins.push_back(RetArg);
10069 }
10070
10071 // Look for stores of arguments to static allocas. Mark such arguments with a
10072 // flag to ask the target to give us the memory location of that argument if
10073 // available.
10074 ArgCopyElisionMapTy ArgCopyElisionCandidates;
10075 findArgumentCopyElisionCandidates(DL, FuncInfo.get(),
10076 ArgCopyElisionCandidates);
10077
10078 // Set up the incoming argument description vector.
10079 for (const Argument &Arg : F.args()) {
10080 unsigned ArgNo = Arg.getArgNo();
10081 SmallVector<EVT, 4> ValueVTs;
10082 ComputeValueVTs(*TLI, DAG.getDataLayout(), Arg.getType(), ValueVTs);
10083 bool isArgValueUsed = !Arg.use_empty();
10084 unsigned PartBase = 0;
10085 Type *FinalType = Arg.getType();
10086 if (Arg.hasAttribute(Attribute::ByVal))
10087 FinalType = Arg.getParamByValType();
10088 bool NeedsRegBlock = TLI->functionArgumentNeedsConsecutiveRegisters(
10089 FinalType, F.getCallingConv(), F.isVarArg(), DL);
10090 for (unsigned Value = 0, NumValues = ValueVTs.size();
10091 Value != NumValues; ++Value) {
10092 EVT VT = ValueVTs[Value];
10093 Type *ArgTy = VT.getTypeForEVT(*DAG.getContext());
10094 ISD::ArgFlagsTy Flags;
10095
10096
10097 if (Arg.getType()->isPointerTy()) {
10098 Flags.setPointer();
10099 Flags.setPointerAddrSpace(
10100 cast<PointerType>(Arg.getType())->getAddressSpace());
10101 }
10102 if (Arg.hasAttribute(Attribute::ZExt))
10103 Flags.setZExt();
10104 if (Arg.hasAttribute(Attribute::SExt))
10105 Flags.setSExt();
10106 if (Arg.hasAttribute(Attribute::InReg)) {
10107 // If we are using vectorcall calling convention, a structure that is
10108 // passed InReg - is surely an HVA
10109 if (F.getCallingConv() == CallingConv::X86_VectorCall &&
10110 isa<StructType>(Arg.getType())) {
10111 // The first value of a structure is marked
10112 if (0 == Value)
10113 Flags.setHvaStart();
10114 Flags.setHva();
10115 }
10116 // Set InReg Flag
10117 Flags.setInReg();
10118 }
10119 if (Arg.hasAttribute(Attribute::StructRet))
10120 Flags.setSRet();
10121 if (Arg.hasAttribute(Attribute::SwiftSelf))
10122 Flags.setSwiftSelf();
10123 if (Arg.hasAttribute(Attribute::SwiftAsync))
10124 Flags.setSwiftAsync();
10125 if (Arg.hasAttribute(Attribute::SwiftError))
10126 Flags.setSwiftError();
10127 if (Arg.hasAttribute(Attribute::ByVal))
10128 Flags.setByVal();
10129 if (Arg.hasAttribute(Attribute::ByRef))
10130 Flags.setByRef();
10131 if (Arg.hasAttribute(Attribute::InAlloca)) {
10132 Flags.setInAlloca();
10133 // Set the byval flag for CCAssignFn callbacks that don't know about
10134 // inalloca. This way we can know how many bytes we should've allocated
10135 // and how many bytes a callee cleanup function will pop. If we port
10136 // inalloca to more targets, we'll have to add custom inalloca handling
10137 // in the various CC lowering callbacks.
10138 Flags.setByVal();
10139 }
10140 if (Arg.hasAttribute(Attribute::Preallocated)) {
10141 Flags.setPreallocated();
10142 // Set the byval flag for CCAssignFn callbacks that don't know about
10143 // preallocated. This way we can know how many bytes we should've
10144 // allocated and how many bytes a callee cleanup function will pop. If
10145 // we port preallocated to more targets, we'll have to add custom
10146 // preallocated handling in the various CC lowering callbacks.
10147 Flags.setByVal();
10148 }
10149
10150 // Certain targets (such as MIPS), may have a different ABI alignment
10151 // for a type depending on the context. Give the target a chance to
10152 // specify the alignment it wants.
10153 const Align OriginalAlignment(
10154 TLI->getABIAlignmentForCallingConv(ArgTy, DL));
10155 Flags.setOrigAlign(OriginalAlignment);
10156
10157 Align MemAlign;
10158 Type *ArgMemTy = nullptr;
10159 if (Flags.isByVal() || Flags.isInAlloca() || Flags.isPreallocated() ||
10160 Flags.isByRef()) {
10161 if (!ArgMemTy)
10162 ArgMemTy = Arg.getPointeeInMemoryValueType();
10163
10164 uint64_t MemSize = DL.getTypeAllocSize(ArgMemTy);
10165
10166 // For in-memory arguments, size and alignment should be passed from FE.
10167 // BE will guess if this info is not there but there are cases it cannot
10168 // get right.
10169 if (auto ParamAlign = Arg.getParamStackAlign())
10170 MemAlign = *ParamAlign;
10171 else if ((ParamAlign = Arg.getParamAlign()))
10172 MemAlign = *ParamAlign;
10173 else
10174 MemAlign = Align(TLI->getByValTypeAlignment(ArgMemTy, DL));
10175 if (Flags.isByRef())
10176 Flags.setByRefSize(MemSize);
10177 else
10178 Flags.setByValSize(MemSize);
10179 } else if (auto ParamAlign = Arg.getParamStackAlign()) {
10180 MemAlign = *ParamAlign;
10181 } else {
10182 MemAlign = OriginalAlignment;
10183 }
10184 Flags.setMemAlign(MemAlign);
10185
10186 if (Arg.hasAttribute(Attribute::Nest))
10187 Flags.setNest();
10188 if (NeedsRegBlock)
10189 Flags.setInConsecutiveRegs();
10190 if (ArgCopyElisionCandidates.count(&Arg))
10191 Flags.setCopyElisionCandidate();
10192 if (Arg.hasAttribute(Attribute::Returned))
10193 Flags.setReturned();
10194
10195 MVT RegisterVT = TLI->getRegisterTypeForCallingConv(
10196 *CurDAG->getContext(), F.getCallingConv(), VT);
10197 unsigned NumRegs = TLI->getNumRegistersForCallingConv(
10198 *CurDAG->getContext(), F.getCallingConv(), VT);
10199 for (unsigned i = 0; i != NumRegs; ++i) {
10200 // For scalable vectors, use the minimum size; individual targets
10201 // are responsible for handling scalable vector arguments and
10202 // return values.
10203 ISD::InputArg MyFlags(Flags, RegisterVT, VT, isArgValueUsed,
10204 ArgNo, PartBase+i*RegisterVT.getStoreSize().getKnownMinSize());
10205 if (NumRegs > 1 && i == 0)
10206 MyFlags.Flags.setSplit();
10207 // if it isn't first piece, alignment must be 1
10208 else if (i > 0) {
10209 MyFlags.Flags.setOrigAlign(Align(1));
10210 if (i == NumRegs - 1)
10211 MyFlags.Flags.setSplitEnd();
10212 }
10213 Ins.push_back(MyFlags);
10214 }
10215 if (NeedsRegBlock && Value == NumValues - 1)
10216 Ins[Ins.size() - 1].Flags.setInConsecutiveRegsLast();
10217 PartBase += VT.getStoreSize().getKnownMinSize();
10218 }
10219 }
10220
10221 // Call the target to set up the argument values.
10222 SmallVector<SDValue, 8> InVals;
10223 SDValue NewRoot = TLI->LowerFormalArguments(
10224 DAG.getRoot(), F.getCallingConv(), F.isVarArg(), Ins, dl, DAG, InVals);
10225
10226 // Verify that the target's LowerFormalArguments behaved as expected.
10227 assert(NewRoot.getNode() && NewRoot.getValueType() == MVT::Other &&((void)0)
10228 "LowerFormalArguments didn't return a valid chain!")((void)0);
10229 assert(InVals.size() == Ins.size() &&((void)0)
10230 "LowerFormalArguments didn't emit the correct number of values!")((void)0);
10231 LLVM_DEBUG({do { } while (false)
10232 for (unsigned i = 0, e = Ins.size(); i != e; ++i) {do { } while (false)
10233 assert(InVals[i].getNode() &&do { } while (false)
10234 "LowerFormalArguments emitted a null value!");do { } while (false)
10235 assert(EVT(Ins[i].VT) == InVals[i].getValueType() &&do { } while (false)
10236 "LowerFormalArguments emitted a value with the wrong type!");do { } while (false)
10237 }do { } while (false)
10238 })do { } while (false);
10239
10240 // Update the DAG with the new chain value resulting from argument lowering.
10241 DAG.setRoot(NewRoot);
10242
10243 // Set up the argument values.
10244 unsigned i = 0;
10245 if (!FuncInfo->CanLowerReturn) {
10246 // Create a virtual register for the sret pointer, and put in a copy
10247 // from the sret argument into it.
10248 SmallVector<EVT, 1> ValueVTs;
10249 ComputeValueVTs(*TLI, DAG.getDataLayout(),
10250 F.getReturnType()->getPointerTo(
10251 DAG.getDataLayout().getAllocaAddrSpace()),
10252 ValueVTs);
10253 MVT VT = ValueVTs[0].getSimpleVT();
10254 MVT RegVT = TLI->getRegisterType(*CurDAG->getContext(), VT);
10255 Optional<ISD::NodeType> AssertOp = None;
10256 SDValue ArgValue = getCopyFromParts(DAG, dl, &InVals[0], 1, RegVT, VT,
10257 nullptr, F.getCallingConv(), AssertOp);
10258
10259 MachineFunction& MF = SDB->DAG.getMachineFunction();
10260 MachineRegisterInfo& RegInfo = MF.getRegInfo();
10261 Register SRetReg =
10262 RegInfo.createVirtualRegister(TLI->getRegClassFor(RegVT));
10263 FuncInfo->DemoteRegister = SRetReg;
10264 NewRoot =
10265 SDB->DAG.getCopyToReg(NewRoot, SDB->getCurSDLoc(), SRetReg, ArgValue);
10266 DAG.setRoot(NewRoot);
10267
10268 // i indexes lowered arguments. Bump it past the hidden sret argument.
10269 ++i;
10270 }
10271
10272 SmallVector<SDValue, 4> Chains;
10273 DenseMap<int, int> ArgCopyElisionFrameIndexMap;
10274 for (const Argument &Arg : F.args()) {
10275 SmallVector<SDValue, 4> ArgValues;
10276 SmallVector<EVT, 4> ValueVTs;
10277 ComputeValueVTs(*TLI, DAG.getDataLayout(), Arg.getType(), ValueVTs);
10278 unsigned NumValues = ValueVTs.size();
10279 if (NumValues == 0)
10280 continue;
10281
10282 bool ArgHasUses = !Arg.use_empty();
10283
10284 // Elide the copying store if the target loaded this argument from a
10285 // suitable fixed stack object.
10286 if (Ins[i].Flags.isCopyElisionCandidate()) {
10287 tryToElideArgumentCopy(*FuncInfo, Chains, ArgCopyElisionFrameIndexMap,
10288 ElidedArgCopyInstrs, ArgCopyElisionCandidates, Arg,
10289 InVals[i], ArgHasUses);
10290 }
10291
10292 // If this argument is unused then remember its value. It is used to generate
10293 // debugging information.
10294 bool isSwiftErrorArg =
10295 TLI->supportSwiftError() &&
10296 Arg.hasAttribute(Attribute::SwiftError);
10297 if (!ArgHasUses && !isSwiftErrorArg) {
10298 SDB->setUnusedArgValue(&Arg, InVals[i]);
10299
10300 // Also remember any frame index for use in FastISel.
10301 if (FrameIndexSDNode *FI =
10302 dyn_cast<FrameIndexSDNode>(InVals[i].getNode()))
10303 FuncInfo->setArgumentFrameIndex(&Arg, FI->getIndex());
10304 }
10305
10306 for (unsigned Val = 0; Val != NumValues; ++Val) {
10307 EVT VT = ValueVTs[Val];
10308 MVT PartVT = TLI->getRegisterTypeForCallingConv(*CurDAG->getContext(),
10309 F.getCallingConv(), VT);
10310 unsigned NumParts = TLI->getNumRegistersForCallingConv(
10311 *CurDAG->getContext(), F.getCallingConv(), VT);
10312
10313 // Even an apparent 'unused' swifterror argument needs to be returned. So
10314 // we do generate a copy for it that can be used on return from the
10315 // function.
10316 if (ArgHasUses || isSwiftErrorArg) {
10317 Optional<ISD::NodeType> AssertOp;
10318 if (Arg.hasAttribute(Attribute::SExt))
10319 AssertOp = ISD::AssertSext;
10320 else if (Arg.hasAttribute(Attribute::ZExt))
10321 AssertOp = ISD::AssertZext;
10322
10323 ArgValues.push_back(getCopyFromParts(DAG, dl, &InVals[i], NumParts,
10324 PartVT, VT, nullptr,
10325 F.getCallingConv(), AssertOp));
10326 }
10327
10328 i += NumParts;
10329 }
10330
10331 // We don't need to do anything else for unused arguments.
10332 if (ArgValues.empty())
10333 continue;
10334
10335 // Note down frame index.
10336 if (FrameIndexSDNode *FI =
10337 dyn_cast<FrameIndexSDNode>(ArgValues[0].getNode()))
10338 FuncInfo->setArgumentFrameIndex(&Arg, FI->getIndex());
10339
10340 SDValue Res = DAG.getMergeValues(makeArrayRef(ArgValues.data(), NumValues),
10341 SDB->getCurSDLoc());
10342
10343 SDB->setValue(&Arg, Res);
10344 if (!TM.Options.EnableFastISel && Res.getOpcode() == ISD::BUILD_PAIR) {
10345 // We want to associate the argument with the frame index, among
10346 // involved operands, that correspond to the lowest address. The
10347 // getCopyFromParts function, called earlier, is swapping the order of
10348 // the operands to BUILD_PAIR depending on endianness. The result of
10349 // that swapping is that the least significant bits of the argument will
10350 // be in the first operand of the BUILD_PAIR node, and the most
10351 // significant bits will be in the second operand.
10352 unsigned LowAddressOp = DAG.getDataLayout().isBigEndian() ? 1 : 0;
10353 if (LoadSDNode *LNode =
10354 dyn_cast<LoadSDNode>(Res.getOperand(LowAddressOp).getNode()))
10355 if (FrameIndexSDNode *FI =
10356 dyn_cast<FrameIndexSDNode>(LNode->getBasePtr().getNode()))
10357 FuncInfo->setArgumentFrameIndex(&Arg, FI->getIndex());
10358 }
10359
10360 // Analyses past this point are naive and don't expect an assertion.
10361 if (Res.getOpcode() == ISD::AssertZext)
10362 Res = Res.getOperand(0);
10363
10364 // Update the SwiftErrorVRegDefMap.
10365 if (Res.getOpcode() == ISD::CopyFromReg && isSwiftErrorArg) {
10366 unsigned Reg = cast<RegisterSDNode>(Res.getOperand(1))->getReg();
10367 if (Register::isVirtualRegister(Reg))
10368 SwiftError->setCurrentVReg(FuncInfo->MBB, SwiftError->getFunctionArg(),
10369 Reg);
10370 }
10371
10372 // If this argument is live outside of the entry block, insert a copy from
10373 // wherever we got it to the vreg that other BB's will reference it as.
10374 if (Res.getOpcode() == ISD::CopyFromReg) {
10375 // If we can, though, try to skip creating an unnecessary vreg.
10376 // FIXME: This isn't very clean... it would be nice to make this more
10377 // general.
10378 unsigned Reg = cast<RegisterSDNode>(Res.getOperand(1))->getReg();
10379 if (Register::isVirtualRegister(Reg)) {
10380 FuncInfo->ValueMap[&Arg] = Reg;
10381 continue;
10382 }
10383 }
10384 if (!isOnlyUsedInEntryBlock(&Arg, TM.Options.EnableFastISel)) {
10385 FuncInfo->InitializeRegForValue(&Arg);
10386 SDB->CopyToExportRegsIfNeeded(&Arg);
10387 }
10388 }
10389
10390 if (!Chains.empty()) {
10391 Chains.push_back(NewRoot);
10392 NewRoot = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Chains);
10393 }
10394
10395 DAG.setRoot(NewRoot);
10396
10397 assert(i == InVals.size() && "Argument register count mismatch!")((void)0);
10398
10399 // If any argument copy elisions occurred and we have debug info, update the
10400 // stale frame indices used in the dbg.declare variable info table.
10401 MachineFunction::VariableDbgInfoMapTy &DbgDeclareInfo = MF->getVariableDbgInfo();
10402 if (!DbgDeclareInfo.empty() && !ArgCopyElisionFrameIndexMap.empty()) {
10403 for (MachineFunction::VariableDbgInfo &VI : DbgDeclareInfo) {
10404 auto I = ArgCopyElisionFrameIndexMap.find(VI.Slot);
10405 if (I != ArgCopyElisionFrameIndexMap.end())
10406 VI.Slot = I->second;
10407 }
10408 }
10409
10410 // Finally, if the target has anything special to do, allow it to do so.
10411 emitFunctionEntryCode();
10412}
10413
10414/// Handle PHI nodes in successor blocks. Emit code into the SelectionDAG to
10415/// ensure constants are generated when needed. Remember the virtual registers
10416/// that need to be added to the Machine PHI nodes as input. We cannot just
10417/// directly add them, because expansion might result in multiple MBB's for one
10418/// BB. As such, the start of the BB might correspond to a different MBB than
10419/// the end.
10420void
10421SelectionDAGBuilder::HandlePHINodesInSuccessorBlocks(const BasicBlock *LLVMBB) {
10422 const Instruction *TI = LLVMBB->getTerminator();
10423
10424 SmallPtrSet<MachineBasicBlock *, 4> SuccsHandled;
10425
10426 // Check PHI nodes in successors that expect a value to be available from this
10427 // block.
10428 for (unsigned succ = 0, e = TI->getNumSuccessors(); succ != e; ++succ) {
1
Assuming 'succ' is not equal to 'e'
→
2
←
Loop condition is true. Entering loop body
→
10429 const BasicBlock *SuccBB = TI->getSuccessor(succ);
10430 if (!isa<PHINode>(SuccBB->begin())) continue;
3
←
Assuming the object is a 'PHINode'
→
4
←
Taking false branch
→
10431 MachineBasicBlock *SuccMBB = FuncInfo.MBBMap[SuccBB];
10432
10433 // If this terminator has multiple identical successors (common for
10434 // switches), only handle each succ once.
10435 if (!SuccsHandled.insert(SuccMBB).second)
5
←
Assuming field 'second' is true
→
6
←
Taking false branch
→
10436 continue;
10437
10438 MachineBasicBlock::iterator MBBI = SuccMBB->begin();
10439
10440 // At this point we know that there is a 1-1 correspondence between LLVM PHI
10441 // nodes and Machine PHI nodes, but the incoming operands have not been
10442 // emitted yet.
10443 for (const PHINode &PN : SuccBB->phis()) {
10444 // Ignore dead phi's.
10445 if (PN.use_empty())
7
←
Taking false branch
→
10446 continue;
10447
10448 // Skip empty types
10449 if (PN.getType()->isEmptyTy())
8
←
Assuming the condition is false
→
9
←
Taking false branch
→
10450 continue;
10451
10452 unsigned Reg;
10453 const Value *PHIOp = PN.getIncomingValueForBlock(LLVMBB);
10454
10455 if (const Constant *C = dyn_cast<Constant>(PHIOp)) {
10
←
Assuming 'C' is non-null
→
11
←
Taking true branch
→
10456 unsigned &RegOut = ConstantsOut[C];
10457 if (RegOut == 0) {
12
←
Assuming 'RegOut' is equal to 0
→
13
←
Taking true branch
→
10458 RegOut = FuncInfo.CreateRegs(C);
10459 CopyValueToVirtualRegister(C, RegOut);
14
←
Calling 'SelectionDAGBuilder::CopyValueToVirtualRegister'
→
10460 }
10461 Reg = RegOut;
10462 } else {
10463 DenseMap<const Value *, Register>::iterator I =
10464 FuncInfo.ValueMap.find(PHIOp);
10465 if (I != FuncInfo.ValueMap.end())
10466 Reg = I->second;
10467 else {
10468 assert(isa<AllocaInst>(PHIOp) &&((void)0)
10469 FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(PHIOp)) &&((void)0)
10470 "Didn't codegen value into a register!??")((void)0);
10471 Reg = FuncInfo.CreateRegs(PHIOp);
10472 CopyValueToVirtualRegister(PHIOp, Reg);
10473 }
10474 }
10475
10476 // Remember that this register needs to added to the machine PHI node as
10477 // the input for this MBB.
10478 SmallVector<EVT, 4> ValueVTs;
10479 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
10480 ComputeValueVTs(TLI, DAG.getDataLayout(), PN.getType(), ValueVTs);
10481 for (unsigned vti = 0, vte = ValueVTs.size(); vti != vte; ++vti) {
10482 EVT VT = ValueVTs[vti];
10483 unsigned NumRegisters = TLI.getNumRegisters(*DAG.getContext(), VT);
10484 for (unsigned i = 0, e = NumRegisters; i != e; ++i)
10485 FuncInfo.PHINodesToUpdate.push_back(
10486 std::make_pair(&*MBBI++, Reg + i));
10487 Reg += NumRegisters;
10488 }
10489 }
10490 }
10491
10492 ConstantsOut.clear();
10493}
10494
10495/// Add a successor MBB to ParentMBB< creating a new MachineBB for BB if SuccMBB
10496/// is 0.
10497MachineBasicBlock *
10498SelectionDAGBuilder::StackProtectorDescriptor::
10499AddSuccessorMBB(const BasicBlock *BB,
10500 MachineBasicBlock *ParentMBB,
10501 bool IsLikely,
10502 MachineBasicBlock *SuccMBB) {
10503 // If SuccBB has not been created yet, create it.
10504 if (!SuccMBB) {
10505 MachineFunction *MF = ParentMBB->getParent();
10506 MachineFunction::iterator BBI(ParentMBB);
10507 SuccMBB = MF->CreateMachineBasicBlock(BB);
10508 MF->insert(++BBI, SuccMBB);
10509 }
10510 // Add it as a successor of ParentMBB.
10511 ParentMBB->addSuccessor(
10512 SuccMBB, BranchProbabilityInfo::getBranchProbStackProtector(IsLikely));
10513 return SuccMBB;
10514}
10515
10516MachineBasicBlock *SelectionDAGBuilder::NextBlock(MachineBasicBlock *MBB) {
10517 MachineFunction::iterator I(MBB);
10518 if (++I == FuncInfo.MF->end())
10519 return nullptr;
10520 return &*I;
10521}
10522
10523/// During lowering new call nodes can be created (such as memset, etc.).
10524/// Those will become new roots of the current DAG, but complications arise
10525/// when they are tail calls. In such cases, the call lowering will update
10526/// the root, but the builder still needs to know that a tail call has been
10527/// lowered in order to avoid generating an additional return.
10528void SelectionDAGBuilder::updateDAGForMaybeTailCall(SDValue MaybeTC) {
10529 // If the node is null, we do have a tail call.
10530 if (MaybeTC.getNode() != nullptr)
10531 DAG.setRoot(MaybeTC);
10532 else
10533 HasTailCall = true;
10534}
10535
10536void SelectionDAGBuilder::lowerWorkItem(SwitchWorkListItem W, Value *Cond,
10537 MachineBasicBlock *SwitchMBB,
10538 MachineBasicBlock *DefaultMBB) {
10539 MachineFunction *CurMF = FuncInfo.MF;
10540 MachineBasicBlock *NextMBB = nullptr;
10541 MachineFunction::iterator BBI(W.MBB);
10542 if (++BBI != FuncInfo.MF->end())
10543 NextMBB = &*BBI;
10544
10545 unsigned Size = W.LastCluster - W.FirstCluster + 1;
10546
10547 BranchProbabilityInfo *BPI = FuncInfo.BPI;
10548
10549 if (Size == 2 && W.MBB == SwitchMBB) {
10550 // If any two of the cases has the same destination, and if one value
10551 // is the same as the other, but has one bit unset that the other has set,
10552 // use bit manipulation to do two compares at once. For example:
10553 // "if (X == 6 || X == 4)" -> "if ((X|2) == 6)"
10554 // TODO: This could be extended to merge any 2 cases in switches with 3
10555 // cases.
10556 // TODO: Handle cases where W.CaseBB != SwitchBB.
10557 CaseCluster &Small = *W.FirstCluster;
10558 CaseCluster &Big = *W.LastCluster;
10559
10560 if (Small.Low == Small.High && Big.Low == Big.High &&
10561 Small.MBB == Big.MBB) {
10562 const APInt &SmallValue = Small.Low->getValue();
10563 const APInt &BigValue = Big.Low->getValue();
10564
10565 // Check that there is only one bit different.
10566 APInt CommonBit = BigValue ^ SmallValue;
10567 if (CommonBit.isPowerOf2()) {
10568 SDValue CondLHS = getValue(Cond);
10569 EVT VT = CondLHS.getValueType();
10570 SDLoc DL = getCurSDLoc();
10571
10572 SDValue Or = DAG.getNode(ISD::OR, DL, VT, CondLHS,
10573 DAG.getConstant(CommonBit, DL, VT));
10574 SDValue Cond = DAG.getSetCC(
10575 DL, MVT::i1, Or, DAG.getConstant(BigValue | SmallValue, DL, VT),
10576 ISD::SETEQ);
10577
10578 // Update successor info.
10579 // Both Small and Big will jump to Small.BB, so we sum up the
10580 // probabilities.
10581 addSuccessorWithProb(SwitchMBB, Small.MBB, Small.Prob + Big.Prob);
10582 if (BPI)
10583 addSuccessorWithProb(
10584 SwitchMBB, DefaultMBB,
10585 // The default destination is the first successor in IR.
10586 BPI->getEdgeProbability(SwitchMBB->getBasicBlock(), (unsigned)0));
10587 else
10588 addSuccessorWithProb(SwitchMBB, DefaultMBB);
10589
10590 // Insert the true branch.
10591 SDValue BrCond =
10592 DAG.getNode(ISD::BRCOND, DL, MVT::Other, getControlRoot(), Cond,
10593 DAG.getBasicBlock(Small.MBB));
10594 // Insert the false branch.
10595 BrCond = DAG.getNode(ISD::BR, DL, MVT::Other, BrCond,
10596 DAG.getBasicBlock(DefaultMBB));
10597
10598 DAG.setRoot(BrCond);
10599 return;
10600 }
10601 }
10602 }
10603
10604 if (TM.getOptLevel() != CodeGenOpt::None) {
10605 // Here, we order cases by probability so the most likely case will be
10606 // checked first. However, two clusters can have the same probability in
10607 // which case their relative ordering is non-deterministic. So we use Low
10608 // as a tie-breaker as clusters are guaranteed to never overlap.
10609 llvm::sort(W.FirstCluster, W.LastCluster + 1,
10610 [](const CaseCluster &a, const CaseCluster &b) {
10611 return a.Prob != b.Prob ?
10612 a.Prob > b.Prob :
10613 a.Low->getValue().slt(b.Low->getValue());
10614 });
10615
10616 // Rearrange the case blocks so that the last one falls through if possible
10617 // without changing the order of probabilities.
10618 for (CaseClusterIt I = W.LastCluster; I > W.FirstCluster; ) {
10619 --I;
10620 if (I->Prob > W.LastCluster->Prob)
10621 break;
10622 if (I->Kind == CC_Range && I->MBB == NextMBB) {
10623 std::swap(*I, *W.LastCluster);
10624 break;
10625 }
10626 }
10627 }
10628
10629 // Compute total probability.
10630 BranchProbability DefaultProb = W.DefaultProb;
10631 BranchProbability UnhandledProbs = DefaultProb;
10632 for (CaseClusterIt I = W.FirstCluster; I <= W.LastCluster; ++I)
10633 UnhandledProbs += I->Prob;
10634
10635 MachineBasicBlock *CurMBB = W.MBB;
10636 for (CaseClusterIt I = W.FirstCluster, E = W.LastCluster; I <= E; ++I) {
10637 bool FallthroughUnreachable = false;
10638 MachineBasicBlock *Fallthrough;
10639 if (I == W.LastCluster) {
10640 // For the last cluster, fall through to the default destination.
10641 Fallthrough = DefaultMBB;
10642 FallthroughUnreachable = isa<UnreachableInst>(
10643 DefaultMBB->getBasicBlock()->getFirstNonPHIOrDbg());
10644 } else {
10645 Fallthrough = CurMF->CreateMachineBasicBlock(CurMBB->getBasicBlock());
10646 CurMF->insert(BBI, Fallthrough);
10647 // Put Cond in a virtual register to make it available from the new blocks.
10648 ExportFromCurrentBlock(Cond);
10649 }
10650 UnhandledProbs -= I->Prob;
10651
10652 switch (I->Kind) {
10653 case CC_JumpTable: {
10654 // FIXME: Optimize away range check based on pivot comparisons.
10655 JumpTableHeader *JTH = &SL->JTCases[I->JTCasesIndex].first;
10656 SwitchCG::JumpTable *JT = &SL->JTCases[I->JTCasesIndex].second;
10657
10658 // The jump block hasn't been inserted yet; insert it here.
10659 MachineBasicBlock *JumpMBB = JT->MBB;
10660 CurMF->insert(BBI, JumpMBB);
10661
10662 auto JumpProb = I->Prob;
10663 auto FallthroughProb = UnhandledProbs;
10664
10665 // If the default statement is a target of the jump table, we evenly
10666 // distribute the default probability to successors of CurMBB. Also
10667 // update the probability on the edge from JumpMBB to Fallthrough.
10668 for (MachineBasicBlock::succ_iterator SI = JumpMBB->succ_begin(),
10669 SE = JumpMBB->succ_end();
10670 SI != SE; ++SI) {
10671 if (*SI == DefaultMBB) {
10672 JumpProb += DefaultProb / 2;
10673 FallthroughProb -= DefaultProb / 2;
10674 JumpMBB->setSuccProbability(SI, DefaultProb / 2);
10675 JumpMBB->normalizeSuccProbs();
10676 break;
10677 }
10678 }
10679
10680 if (FallthroughUnreachable) {
10681 // Skip the range check if the fallthrough block is unreachable.
10682 JTH->OmitRangeCheck = true;
10683 }
10684
10685 if (!JTH->OmitRangeCheck)
10686 addSuccessorWithProb(CurMBB, Fallthrough, FallthroughProb);
10687 addSuccessorWithProb(CurMBB, JumpMBB, JumpProb);
10688 CurMBB->normalizeSuccProbs();
10689
10690 // The jump table header will be inserted in our current block, do the
10691 // range check, and fall through to our fallthrough block.
10692 JTH->HeaderBB = CurMBB;
10693 JT->Default = Fallthrough; // FIXME: Move Default to JumpTableHeader.
10694
10695 // If we're in the right place, emit the jump table header right now.
10696 if (CurMBB == SwitchMBB) {
10697 visitJumpTableHeader(*JT, *JTH, SwitchMBB);
10698 JTH->Emitted = true;
10699 }
10700 break;
10701 }
10702 case CC_BitTests: {
10703 // FIXME: Optimize away range check based on pivot comparisons.
10704 BitTestBlock *BTB = &SL->BitTestCases[I->BTCasesIndex];
10705
10706 // The bit test blocks haven't been inserted yet; insert them here.
10707 for (BitTestCase &BTC : BTB->Cases)
10708 CurMF->insert(BBI, BTC.ThisBB);
10709
10710 // Fill in fields of the BitTestBlock.
10711 BTB->Parent = CurMBB;
10712 BTB->Default = Fallthrough;
10713
10714 BTB->DefaultProb = UnhandledProbs;
10715 // If the cases in bit test don't form a contiguous range, we evenly
10716 // distribute the probability on the edge to Fallthrough to two
10717 // successors of CurMBB.
10718 if (!BTB->ContiguousRange) {
10719 BTB->Prob += DefaultProb / 2;
10720 BTB->DefaultProb -= DefaultProb / 2;
10721 }
10722
10723 if (FallthroughUnreachable) {
10724 // Skip the range check if the fallthrough block is unreachable.
10725 BTB->OmitRangeCheck = true;
10726 }
10727
10728 // If we're in the right place, emit the bit test header right now.
10729 if (CurMBB == SwitchMBB) {
10730 visitBitTestHeader(*BTB, SwitchMBB);
10731 BTB->Emitted = true;
10732 }
10733 break;
10734 }
10735 case CC_Range: {
10736 const Value *RHS, *LHS, *MHS;
10737 ISD::CondCode CC;
10738 if (I->Low == I->High) {
10739 // Check Cond == I->Low.
10740 CC = ISD::SETEQ;
10741 LHS = Cond;
10742 RHS=I->Low;
10743 MHS = nullptr;
10744 } else {
10745 // Check I->Low <= Cond <= I->High.
10746 CC = ISD::SETLE;
10747 LHS = I->Low;
10748 MHS = Cond;
10749 RHS = I->High;
10750 }
10751
10752 // If Fallthrough is unreachable, fold away the comparison.
10753 if (FallthroughUnreachable)
10754 CC = ISD::SETTRUE;
10755
10756 // The false probability is the sum of all unhandled cases.
10757 CaseBlock CB(CC, LHS, RHS, MHS, I->MBB, Fallthrough, CurMBB,
10758 getCurSDLoc(), I->Prob, UnhandledProbs);
10759
10760 if (CurMBB == SwitchMBB)
10761 visitSwitchCase(CB, SwitchMBB);
10762 else
10763 SL->SwitchCases.push_back(CB);
10764
10765 break;
10766 }
10767 }
10768 CurMBB = Fallthrough;
10769 }
10770}
10771
10772unsigned SelectionDAGBuilder::caseClusterRank(const CaseCluster &CC,
10773 CaseClusterIt First,
10774 CaseClusterIt Last) {
10775 return std::count_if(First, Last + 1, [&](const CaseCluster &X) {
10776 if (X.Prob != CC.Prob)
10777 return X.Prob > CC.Prob;
10778
10779 // Ties are broken by comparing the case value.
10780 return X.Low->getValue().slt(CC.Low->getValue());
10781 });
10782}
10783
10784void SelectionDAGBuilder::splitWorkItem(SwitchWorkList &WorkList,
10785 const SwitchWorkListItem &W,
10786 Value *Cond,
10787 MachineBasicBlock *SwitchMBB) {
10788 assert(W.FirstCluster->Low->getValue().slt(W.LastCluster->Low->getValue()) &&((void)0)
10789 "Clusters not sorted?")((void)0);
10790
10791 assert(W.LastCluster - W.FirstCluster + 1 >= 2 && "Too small to split!")((void)0);
10792
10793 // Balance the tree based on branch probabilities to create a near-optimal (in
10794 // terms of search time given key frequency) binary search tree. See e.g. Kurt
10795 // Mehlhorn "Nearly Optimal Binary Search Trees" (1975).
10796 CaseClusterIt LastLeft = W.FirstCluster;
10797 CaseClusterIt FirstRight = W.LastCluster;
10798 auto LeftProb = LastLeft->Prob + W.DefaultProb / 2;
10799 auto RightProb = FirstRight->Prob + W.DefaultProb / 2;
10800
10801 // Move LastLeft and FirstRight towards each other from opposite directions to
10802 // find a partitioning of the clusters which balances the probability on both
10803 // sides. If LeftProb and RightProb are equal, alternate which side is
10804 // taken to ensure 0-probability nodes are distributed evenly.
10805 unsigned I = 0;
10806 while (LastLeft + 1 < FirstRight) {
10807 if (LeftProb < RightProb || (LeftProb == RightProb && (I & 1)))
10808 LeftProb += (++LastLeft)->Prob;
10809 else
10810 RightProb += (--FirstRight)->Prob;
10811 I++;
10812 }
10813
10814 while (true) {
10815 // Our binary search tree differs from a typical BST in that ours can have up
10816 // to three values in each leaf. The pivot selection above doesn't take that
10817 // into account, which means the tree might require more nodes and be less
10818 // efficient. We compensate for this here.
10819
10820 unsigned NumLeft = LastLeft - W.FirstCluster + 1;
10821 unsigned NumRight = W.LastCluster - FirstRight + 1;
10822
10823 if (std::min(NumLeft, NumRight) < 3 && std::max(NumLeft, NumRight) > 3) {
10824 // If one side has less than 3 clusters, and the other has more than 3,
10825 // consider taking a cluster from the other side.
10826
10827 if (NumLeft < NumRight) {
10828 // Consider moving the first cluster on the right to the left side.
10829 CaseCluster &CC = *FirstRight;
10830 unsigned RightSideRank = caseClusterRank(CC, FirstRight, W.LastCluster);
10831 unsigned LeftSideRank = caseClusterRank(CC, W.FirstCluster, LastLeft);
10832 if (LeftSideRank <= RightSideRank) {
10833 // Moving the cluster to the left does not demote it.
10834 ++LastLeft;
10835 ++FirstRight;
10836 continue;
10837 }
10838 } else {
10839 assert(NumRight < NumLeft)((void)0);
10840 // Consider moving the last element on the left to the right side.
10841 CaseCluster &CC = *LastLeft;
10842 unsigned LeftSideRank = caseClusterRank(CC, W.FirstCluster, LastLeft);
10843 unsigned RightSideRank = caseClusterRank(CC, FirstRight, W.LastCluster);
10844 if (RightSideRank <= LeftSideRank) {
10845 // Moving the cluster to the right does not demot it.
10846 --LastLeft;
10847 --FirstRight;
10848 continue;
10849 }
10850 }
10851 }
10852 break;
10853 }
10854
10855 assert(LastLeft + 1 == FirstRight)((void)0);
10856 assert(LastLeft >= W.FirstCluster)((void)0);
10857 assert(FirstRight <= W.LastCluster)((void)0);
10858
10859 // Use the first element on the right as pivot since we will make less-than
10860 // comparisons against it.
10861 CaseClusterIt PivotCluster = FirstRight;
10862 assert(PivotCluster > W.FirstCluster)((void)0);
10863 assert(PivotCluster <= W.LastCluster)((void)0);
10864
10865 CaseClusterIt FirstLeft = W.FirstCluster;
10866 CaseClusterIt LastRight = W.LastCluster;
10867
10868 const ConstantInt *Pivot = PivotCluster->Low;
10869
10870 // New blocks will be inserted immediately after the current one.
10871 MachineFunction::iterator BBI(W.MBB);
10872 ++BBI;
10873
10874 // We will branch to the LHS if Value < Pivot. If LHS is a single cluster,
10875 // we can branch to its destination directly if it's squeezed exactly in
10876 // between the known lower bound and Pivot - 1.
10877 MachineBasicBlock *LeftMBB;
10878 if (FirstLeft == LastLeft && FirstLeft->Kind == CC_Range &&
10879 FirstLeft->Low == W.GE &&
10880 (FirstLeft->High->getValue() + 1LL) == Pivot->getValue()) {
10881 LeftMBB = FirstLeft->MBB;
10882 } else {
10883 LeftMBB = FuncInfo.MF->CreateMachineBasicBlock(W.MBB->getBasicBlock());
10884 FuncInfo.MF->insert(BBI, LeftMBB);
10885 WorkList.push_back(
10886 {LeftMBB, FirstLeft, LastLeft, W.GE, Pivot, W.DefaultProb / 2});
10887 // Put Cond in a virtual register to make it available from the new blocks.
10888 ExportFromCurrentBlock(Cond);
10889 }
10890
10891 // Similarly, we will branch to the RHS if Value >= Pivot. If RHS is a
10892 // single cluster, RHS.Low == Pivot, and we can branch to its destination
10893 // directly if RHS.High equals the current upper bound.
10894 MachineBasicBlock *RightMBB;
10895 if (FirstRight == LastRight && FirstRight->Kind == CC_Range &&
10896 W.LT && (FirstRight->High->getValue() + 1ULL) == W.LT->getValue()) {
10897 RightMBB = FirstRight->MBB;
10898 } else {
10899 RightMBB = FuncInfo.MF->CreateMachineBasicBlock(W.MBB->getBasicBlock());
10900 FuncInfo.MF->insert(BBI, RightMBB);
10901 WorkList.push_back(
10902 {RightMBB, FirstRight, LastRight, Pivot, W.LT, W.DefaultProb / 2});
10903 // Put Cond in a virtual register to make it available from the new blocks.
10904 ExportFromCurrentBlock(Cond);
10905 }
10906
10907 // Create the CaseBlock record that will be used to lower the branch.
10908 CaseBlock CB(ISD::SETLT, Cond, Pivot, nullptr, LeftMBB, RightMBB, W.MBB,
10909 getCurSDLoc(), LeftProb, RightProb);
10910
10911 if (W.MBB == SwitchMBB)
10912 visitSwitchCase(CB, SwitchMBB);
10913 else
10914 SL->SwitchCases.push_back(CB);
10915}
10916
10917// Scale CaseProb after peeling a case with the probablity of PeeledCaseProb
10918// from the swith statement.
10919static BranchProbability scaleCaseProbality(BranchProbability CaseProb,
10920 BranchProbability PeeledCaseProb) {
10921 if (PeeledCaseProb == BranchProbability::getOne())
10922 return BranchProbability::getZero();
10923 BranchProbability SwitchProb = PeeledCaseProb.getCompl();
10924
10925 uint32_t Numerator = CaseProb.getNumerator();
10926 uint32_t Denominator = SwitchProb.scale(CaseProb.getDenominator());
10927 return BranchProbability(Numerator, std::max(Numerator, Denominator));
10928}
10929
10930// Try to peel the top probability case if it exceeds the threshold.
10931// Return current MachineBasicBlock for the switch statement if the peeling
10932// does not occur.
10933// If the peeling is performed, return the newly created MachineBasicBlock
10934// for the peeled switch statement. Also update Clusters to remove the peeled
10935// case. PeeledCaseProb is the BranchProbability for the peeled case.
10936MachineBasicBlock *SelectionDAGBuilder::peelDominantCaseCluster(
10937 const SwitchInst &SI, CaseClusterVector &Clusters,
10938 BranchProbability &PeeledCaseProb) {
10939 MachineBasicBlock *SwitchMBB = FuncInfo.MBB;
10940 // Don't perform if there is only one cluster or optimizing for size.
10941 if (SwitchPeelThreshold > 100 || !FuncInfo.BPI || Clusters.size() < 2 ||
10942 TM.getOptLevel() == CodeGenOpt::None ||
10943 SwitchMBB->getParent()->getFunction().hasMinSize())
10944 return SwitchMBB;
10945
10946 BranchProbability TopCaseProb = BranchProbability(SwitchPeelThreshold, 100);
10947 unsigned PeeledCaseIndex = 0;
10948 bool SwitchPeeled = false;
10949 for (unsigned Index = 0; Index < Clusters.size(); ++Index) {
10950 CaseCluster &CC = Clusters[Index];
10951 if (CC.Prob < TopCaseProb)
10952 continue;
10953 TopCaseProb = CC.Prob;
10954 PeeledCaseIndex = Index;
10955 SwitchPeeled = true;
10956 }
10957 if (!SwitchPeeled)
10958 return SwitchMBB;
10959
10960 LLVM_DEBUG(dbgs() << "Peeled one top case in switch stmt, prob: "do { } while (false)
10961 << TopCaseProb << "\n")do { } while (false);
10962
10963 // Record the MBB for the peeled switch statement.
10964 MachineFunction::iterator BBI(SwitchMBB);
10965 ++BBI;
10966 MachineBasicBlock *PeeledSwitchMBB =
10967 FuncInfo.MF->CreateMachineBasicBlock(SwitchMBB->getBasicBlock());
10968 FuncInfo.MF->insert(BBI, PeeledSwitchMBB);
10969
10970 ExportFromCurrentBlock(SI.getCondition());
10971 auto PeeledCaseIt = Clusters.begin() + PeeledCaseIndex;
10972 SwitchWorkListItem W = {SwitchMBB, PeeledCaseIt, PeeledCaseIt,
10973 nullptr, nullptr, TopCaseProb.getCompl()};
10974 lowerWorkItem(W, SI.getCondition(), SwitchMBB, PeeledSwitchMBB);
10975
10976 Clusters.erase(PeeledCaseIt);
10977 for (CaseCluster &CC : Clusters) {
10978 LLVM_DEBUG(do { } while (false)
10979 dbgs() << "Scale the probablity for one cluster, before scaling: "do { } while (false)
10980 << CC.Prob << "\n")do { } while (false);
10981 CC.Prob = scaleCaseProbality(CC.Prob, TopCaseProb);
10982 LLVM_DEBUG(dbgs() << "After scaling: " << CC.Prob << "\n")do { } while (false);
10983 }
10984 PeeledCaseProb = TopCaseProb;
10985 return PeeledSwitchMBB;
10986}
10987
10988void SelectionDAGBuilder::visitSwitch(const SwitchInst &SI) {
10989 // Extract cases from the switch.
10990 BranchProbabilityInfo *BPI = FuncInfo.BPI;
10991 CaseClusterVector Clusters;
10992 Clusters.reserve(SI.getNumCases());
10993 for (auto I : SI.cases()) {
10994 MachineBasicBlock *Succ = FuncInfo.MBBMap[I.getCaseSuccessor()];
10995 const ConstantInt *CaseVal = I.getCaseValue();
10996 BranchProbability Prob =
10997 BPI ? BPI->getEdgeProbability(SI.getParent(), I.getSuccessorIndex())
10998 : BranchProbability(1, SI.getNumCases() + 1);
10999 Clusters.push_back(CaseCluster::range(CaseVal, CaseVal, Succ, Prob));
11000 }
11001
11002 MachineBasicBlock *DefaultMBB = FuncInfo.MBBMap[SI.getDefaultDest()];
11003
11004 // Cluster adjacent cases with the same destination. We do this at all
11005 // optimization levels because it's cheap to do and will make codegen faster
11006 // if there are many clusters.
11007 sortAndRangeify(Clusters);
11008
11009 // The branch probablity of the peeled case.
11010 BranchProbability PeeledCaseProb = BranchProbability::getZero();
11011 MachineBasicBlock *PeeledSwitchMBB =
11012 peelDominantCaseCluster(SI, Clusters, PeeledCaseProb);
11013
11014 // If there is only the default destination, jump there directly.
11015 MachineBasicBlock *SwitchMBB = FuncInfo.MBB;
11016 if (Clusters.empty()) {
11017 assert(PeeledSwitchMBB == SwitchMBB)((void)0);
11018 SwitchMBB->addSuccessor(DefaultMBB);
11019 if (DefaultMBB != NextBlock(SwitchMBB)) {
11020 DAG.setRoot(DAG.getNode(ISD::BR, getCurSDLoc(), MVT::Other,
11021 getControlRoot(), DAG.getBasicBlock(DefaultMBB)));
11022 }
11023 return;
11024 }
11025
11026 SL->findJumpTables(Clusters, &SI, DefaultMBB, DAG.getPSI(), DAG.getBFI());
11027 SL->findBitTestClusters(Clusters, &SI);
11028
11029 LLVM_DEBUG({do { } while (false)
11030 dbgs() << "Case clusters: ";do { } while (false)
11031 for (const CaseCluster &C : Clusters) {do { } while (false)
11032 if (C.Kind == CC_JumpTable)do { } while (false)
11033 dbgs() << "JT:";do { } while (false)
11034 if (C.Kind == CC_BitTests)do { } while (false)
11035 dbgs() << "BT:";do { } while (false)
11036
11037 C.Low->getValue().print(dbgs(), true);do { } while (false)
11038 if (C.Low != C.High) {do { } while (false)
11039 dbgs() << '-';do { } while (false)
11040 C.High->getValue().print(dbgs(), true);do { } while (false)
11041 }do { } while (false)
11042 dbgs() << ' ';do { } while (false)
11043 }do { } while (false)
11044 dbgs() << '\n';do { } while (false)
11045 })do { } while (false);
11046
11047 assert(!Clusters.empty())((void)0);
11048 SwitchWorkList WorkList;
11049 CaseClusterIt First = Clusters.begin();
11050 CaseClusterIt Last = Clusters.end() - 1;
11051 auto DefaultProb = getEdgeProbability(PeeledSwitchMBB, DefaultMBB);
11052 // Scale the branchprobability for DefaultMBB if the peel occurs and
11053 // DefaultMBB is not replaced.
11054 if (PeeledCaseProb != BranchProbability::getZero() &&
11055 DefaultMBB == FuncInfo.MBBMap[SI.getDefaultDest()])
11056 DefaultProb = scaleCaseProbality(DefaultProb, PeeledCaseProb);
11057 WorkList.push_back(
11058 {PeeledSwitchMBB, First, Last, nullptr, nullptr, DefaultProb});
11059
11060 while (!WorkList.empty()) {
11061 SwitchWorkListItem W = WorkList.pop_back_val();
11062 unsigned NumClusters = W.LastCluster - W.FirstCluster + 1;
11063
11064 if (NumClusters > 3 && TM.getOptLevel() != CodeGenOpt::None &&
11065 !DefaultMBB->getParent()->getFunction().hasMinSize()) {
11066 // For optimized builds, lower large range as a balanced binary tree.
11067 splitWorkItem(WorkList, W, SI.getCondition(), SwitchMBB);
11068 continue;
11069 }
11070
11071 lowerWorkItem(W, SI.getCondition(), SwitchMBB, DefaultMBB);
11072 }
11073}
11074
11075void SelectionDAGBuilder::visitStepVector(const CallInst &I) {
11076 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
11077 auto DL = getCurSDLoc();
11078 EVT ResultVT = TLI.getValueType(DAG.getDataLayout(), I.getType());
11079 setValue(&I, DAG.getStepVector(DL, ResultVT));
11080}
11081
11082void SelectionDAGBuilder::visitVectorReverse(const CallInst &I) {
11083 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
11084 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
11085
11086 SDLoc DL = getCurSDLoc();
11087 SDValue V = getValue(I.getOperand(0));
11088 assert(VT == V.getValueType() && "Malformed vector.reverse!")((void)0);
11089
11090 if (VT.isScalableVector()) {
11091 setValue(&I, DAG.getNode(ISD::VECTOR_REVERSE, DL, VT, V));
11092 return;
11093 }
11094
11095 // Use VECTOR_SHUFFLE for the fixed-length vector
11096 // to maintain existing behavior.
11097 SmallVector<int, 8> Mask;
11098 unsigned NumElts = VT.getVectorMinNumElements();
11099 for (unsigned i = 0; i != NumElts; ++i)
11100 Mask.push_back(NumElts - 1 - i);
11101
11102 setValue(&I, DAG.getVectorShuffle(VT, DL, V, DAG.getUNDEF(VT), Mask));
11103}
11104
11105void SelectionDAGBuilder::visitFreeze(const FreezeInst &I) {
11106 SmallVector<EVT, 4> ValueVTs;
11107 ComputeValueVTs(DAG.getTargetLoweringInfo(), DAG.getDataLayout(), I.getType(),
11108 ValueVTs);
11109 unsigned NumValues = ValueVTs.size();
11110 if (NumValues == 0) return;
11111
11112 SmallVector<SDValue, 4> Values(NumValues);
11113 SDValue Op = getValue(I.getOperand(0));
11114
11115 for (unsigned i = 0; i != NumValues; ++i)
11116 Values[i] = DAG.getNode(ISD::FREEZE, getCurSDLoc(), ValueVTs[i],
11117 SDValue(Op.getNode(), Op.getResNo() + i));
11118
11119 setValue(&I, DAG.getNode(ISD::MERGE_VALUES, getCurSDLoc(),
11120 DAG.getVTList(ValueVTs), Values));
11121}
11122
11123void SelectionDAGBuilder::visitVectorSplice(const CallInst &I) {
11124 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
11125 EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
11126
11127 SDLoc DL = getCurSDLoc();
11128 SDValue V1 = getValue(I.getOperand(0));
11129 SDValue V2 = getValue(I.getOperand(1));
11130 int64_t Imm = cast<ConstantInt>(I.getOperand(2))->getSExtValue();
11131
11132 // VECTOR_SHUFFLE doesn't support a scalable mask so use a dedicated node.
11133 if (VT.isScalableVector()) {
11134 MVT IdxVT = TLI.getVectorIdxTy(DAG.getDataLayout());
11135 setValue(&I, DAG.getNode(ISD::VECTOR_SPLICE, DL, VT, V1, V2,
11136 DAG.getConstant(Imm, DL, IdxVT)));
11137 return;
11138 }
11139
11140 unsigned NumElts = VT.getVectorNumElements();
11141
11142 if ((-Imm > NumElts) || (Imm >= NumElts)) {
11143 // Result is undefined if immediate is out-of-bounds.
11144 setValue(&I, DAG.getUNDEF(VT));
11145 return;
11146 }
11147
11148 uint64_t Idx = (NumElts + Imm) % NumElts;
11149
11150 // Use VECTOR_SHUFFLE to maintain original behaviour for fixed-length vectors.
11151 SmallVector<int, 8> Mask;
11152 for (unsigned i = 0; i < NumElts; ++i)
11153 Mask.push_back(Idx + i);
11154 setValue(&I, DAG.getVectorShuffle(VT, DL, V1, V2, Mask));
11155}