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Add support for fast-math flags to the FCmp instruction.

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FCmp behaves a lot like a floating-point binary operator in many ways,
and can benefit from fast-math information. Flags such as nsz and nnan
can affect if this fcmp (in combination with a select) can be treated
as a fminnum/fmaxnum operation.

This adds backwards-compatible bitcode support, IR parsing and writing,
LangRef changes and IRBuilder changes. I'll need to audit InstSimplify
and InstCombine in a followup to find places where flags should be
copied.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241901 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy
2015-07-10 12:52:00 +00:00
parent e57b60a7f9
commit ee0d992b07
8 changed files with 149 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
lib/Bitcode/Reader/BitcodeReader.cpp
View File

@ -697,6 +697,21 @@ static Comdat::SelectionKind getDecodedComdatSelectionKind(unsigned Val) {
}
}
static FastMathFlags getDecodedFastMathFlags(unsigned Val) {
FastMathFlags FMF;
if (0 != (Val & FastMathFlags::UnsafeAlgebra))
FMF.setUnsafeAlgebra();
if (0 != (Val & FastMathFlags::NoNaNs))
FMF.setNoNaNs();
if (0 != (Val & FastMathFlags::NoInfs))
FMF.setNoInfs();
if (0 != (Val & FastMathFlags::NoSignedZeros))
FMF.setNoSignedZeros();
if (0 != (Val & FastMathFlags::AllowReciprocal))
FMF.setAllowReciprocal();
return FMF;
}
static void upgradeDLLImportExportLinkage(llvm::GlobalValue *GV, unsigned Val) {
switch (Val) {
case 5: GV->setDLLStorageClass(GlobalValue::DLLImportStorageClass); break;
@ -3472,17 +3487,7 @@ std::error_code BitcodeReader::parseFunctionBody(Function *F) {
if (Record[OpNum] & (1 << bitc::PEO_EXACT))
cast<BinaryOperator>(I)->setIsExact(true);
} else if (isa<FPMathOperator>(I)) {
FastMathFlags FMF;
if (0 != (Record[OpNum] & FastMathFlags::UnsafeAlgebra))
FMF.setUnsafeAlgebra();
if (0 != (Record[OpNum] & FastMathFlags::NoNaNs))
FMF.setNoNaNs();
if (0 != (Record[OpNum] & FastMathFlags::NoInfs))
FMF.setNoInfs();
if (0 != (Record[OpNum] & FastMathFlags::NoSignedZeros))
FMF.setNoSignedZeros();
if (0 != (Record[OpNum] & FastMathFlags::AllowReciprocal))
FMF.setAllowReciprocal();
FastMathFlags FMF = getDecodedFastMathFlags(Record[OpNum]);
if (FMF.any())
I->setFastMathFlags(FMF);
}
@ -3739,14 +3744,25 @@ std::error_code BitcodeReader::parseFunctionBody(Function *F) {
unsigned OpNum = 0;
Value *LHS, *RHS;
if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
popValue(Record, OpNum, NextValueNo, LHS->getType(), RHS) ||
OpNum+1 != Record.size())
popValue(Record, OpNum, NextValueNo, LHS->getType(), RHS))
return error("Invalid record");
unsigned PredVal = Record[OpNum];
bool IsFP = LHS->getType()->isFPOrFPVectorTy();
FastMathFlags FMF;
if (IsFP && Record.size() > OpNum+1)
FMF = getDecodedFastMathFlags(Record[++OpNum]);
if (OpNum+1 != Record.size())
return error("Invalid record");
if (LHS->getType()->isFPOrFPVectorTy())
I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS);
I = new FCmpInst((FCmpInst::Predicate)PredVal, LHS, RHS);
else
I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS);
I = new ICmpInst((ICmpInst::Predicate)PredVal, LHS, RHS);
if (FMF.any())
I->setFastMathFlags(FMF);
InstructionList.push_back(I);
break;
}

6
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -1759,13 +1759,17 @@ static void WriteInstruction(const Instruction &I, unsigned InstID,
pushValue(I.getOperand(2), InstID, Vals, VE);
break;
case Instruction::ICmp:
case Instruction::FCmp:
case Instruction::FCmp: {
// compare returning Int1Ty or vector of Int1Ty
Code = bitc::FUNC_CODE_INST_CMP2;
PushValueAndType(I.getOperand(0), InstID, Vals, VE);
pushValue(I.getOperand(1), InstID, Vals, VE);
Vals.push_back(cast<CmpInst>(I).getPredicate());
uint64_t Flags = GetOptimizationFlags(&I);
if (Flags != 0)
Vals.push_back(Flags);
break;
}
case Instruction::Ret:
{