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Use InstCombine's builder in foldSelectCttzCtlz instead of creating a new one. 

Summary: As per title. This will add the instructiions we are interested in in the worklist.

Reviewers: mehdi_amini, majnemer, andreadb

Differential Revision: https://reviews.llvm.org/D29081

llvm-svn: 292957
This commit is contained in:
Amaury Sechet 2017-01-24 17:48:25 +00:00
parent 22a56f2f5a
commit d90f5f6698
1 changed files with 2 additions and 3 deletions
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5
llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
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@ -395,13 +395,12 @@ static Value *foldSelectCttzCtlz(ICmpInst *ICI, Value *TrueVal, Value *FalseVal,
if (match(Count, m_Intrinsic<Intrinsic::cttz>(m_Specific(CmpLHS))) ||
match(Count, m_Intrinsic<Intrinsic::ctlz>(m_Specific(CmpLHS)))) {
IntrinsicInst *II = cast<IntrinsicInst>(Count);
IRBuilder<> Builder(II);
// Explicitly clear the 'undef_on_zero' flag.
IntrinsicInst *NewI = cast<IntrinsicInst>(II->clone());
Type *Ty = NewI->getArgOperand(1)->getType();
NewI->setArgOperand(1, Constant::getNullValue(Ty));
Builder.Insert(NewI);
return Builder.CreateZExtOrTrunc(NewI, ValueOnZero->getType());
Builder->Insert(NewI);
return Builder->CreateZExtOrTrunc(NewI, ValueOnZero->getType());
}
return nullptr;