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Have CannotBeNegativeZero() be aware of the nsz fast-math flag

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169452 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Ilseman 2012-12-06 00:07:09 +00:00
parent 6e3411375e
commit 85893f48a6
1 changed files with 6 additions and 1 deletions
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7
lib/Analysis/ValueTracking.cpp
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@ -1312,7 +1312,12 @@ bool llvm::CannotBeNegativeZero(const Value *V, unsigned Depth) {
const Operator *I = dyn_cast<Operator>(V);
if (I == 0) return false;
// Check if the nsz fast-math flag is set
if (const FPMathOperator *FPO = dyn_cast<FPMathOperator>(I))
if (FPO->hasNoSignedZeros())
return true;
// (add x, 0.0) is guaranteed to return +0.0, not -0.0.
if (I->getOpcode() == Instruction::FAdd &&
isa<ConstantFP>(I->getOperand(1)) &&