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Make demanded-elt simplification for shufflevector slightly stronger. Spotted by inspection.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139768 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-09-15 01:14:29 +00:00
parent b1afbac64b
commit c82751dd67
2 changed files with 14 additions and 0 deletions
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3
lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
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@@ -962,6 +962,9 @@ Value *InstCombiner::SimplifyDemandedVectorElts(Value *V, APInt DemandedElts,
unsigned MaskVal = Shuffle->getMaskValue(i);
if (MaskVal == -1u) {
UndefElts.setBit(i);
} else if (!DemandedElts[i]) {
NewUndefElts = true;
UndefElts.setBit(i);
} else if (MaskVal < LHSVWidth) {
if (UndefElts4[MaskVal]) {
NewUndefElts = true;