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[InstCombine] remove duplicate code for simplifying a shuffle; NFCI

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The transform is already handled by InstSimplify or earlier
in InstCombine, so trying to do it again is not necessary.
This commit is contained in:
Sanjay Patel 2019-11-14 12:06:50 -05:00
parent 592d69a8a6
commit 70a8540846
1 changed files with 0 additions and 7 deletions
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7
lib/Transforms/InstCombine/InstCombineVectorOps.cpp
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@ -2242,12 +2242,5 @@ Instruction *InstCombiner::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
return new ShuffleVectorInst(newLHS, newRHS, ConstantVector::get(Elts));
}
// If the result mask is an identity, replace uses of this instruction with
// corresponding argument.
bool isLHSID, isRHSID;
recognizeIdentityMask(newMask, isLHSID, isRHSID);
if (isLHSID && VWidth == LHSOp0Width) return replaceInstUsesWith(SVI, newLHS);
if (isRHSID && VWidth == RHSOp0Width) return replaceInstUsesWith(SVI, newRHS);
return MadeChange ? &SVI : nullptr;
}