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[InstCombine] simplify code that propagates FMF; NFC

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llvm-svn: 329503
This commit is contained in:
Sanjay Patel 2018-04-07 14:14:23 +00:00
parent e9a4a3920c
commit 7a4b8d9410
1 changed files with 4 additions and 12 deletions
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16
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -1544,9 +1544,7 @@ Instruction *InstCombiner::visitFPTrunc(FPTruncInst &FPT) {
if (OpWidth >= LHSWidth + RHSWidth && DstWidth >= SrcWidth) {
Value *LHS = Builder.CreateFPTrunc(OpI->getOperand(0), Ty);
Value *RHS = Builder.CreateFPTrunc(OpI->getOperand(1), Ty);
Instruction *RI = BinaryOperator::CreateFMul(LHS, RHS);
RI->copyFastMathFlags(OpI);
return RI;
return BinaryOperator::CreateFMulFMF(LHS, RHS, OpI);
}
break;
case Instruction::FDiv:
@ -1559,9 +1557,7 @@ Instruction *InstCombiner::visitFPTrunc(FPTruncInst &FPT) {
if (OpWidth >= 2*DstWidth && DstWidth >= SrcWidth) {
Value *LHS = Builder.CreateFPTrunc(OpI->getOperand(0), Ty);
Value *RHS = Builder.CreateFPTrunc(OpI->getOperand(1), Ty);
Instruction *RI = BinaryOperator::CreateFDiv(LHS, RHS);
RI->copyFastMathFlags(OpI);
return RI;
return BinaryOperator::CreateFDivFMF(LHS, RHS, OpI);
}
break;
case Instruction::FRem: {
@ -1580,9 +1576,7 @@ Instruction *InstCombiner::visitFPTrunc(FPTruncInst &FPT) {
RHS = Builder.CreateFPTrunc(OpI->getOperand(1), RHSMinType);
}
Value *ExactResult = Builder.CreateFRem(LHS, RHS);
if (Instruction *RI = dyn_cast<Instruction>(ExactResult))
RI->copyFastMathFlags(OpI);
Value *ExactResult = Builder.CreateFRemFMF(LHS, RHS, OpI);
return CastInst::CreateFPCast(ExactResult, Ty);
}
}
@ -1590,9 +1584,7 @@ Instruction *InstCombiner::visitFPTrunc(FPTruncInst &FPT) {
// (fptrunc (fneg x)) -> (fneg (fptrunc x))
if (BinaryOperator::isFNeg(OpI)) {
Value *InnerTrunc = Builder.CreateFPTrunc(OpI->getOperand(1), Ty);
Instruction *RI = BinaryOperator::CreateFNeg(InnerTrunc);
RI->copyFastMathFlags(OpI);
return RI;
return BinaryOperator::CreateFNegFMF(InnerTrunc, OpI);
}
}