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| author | Eli Friedman <eli.friedman@gmail.com> | 2011-09-15 01:14:29 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2011-09-15 01:14:29 +0000 |
| commit | c82751dd6761e3db62668b6b1cfddd4f659855b6 (patch) | |
| tree | 7dfc93f730b3f9176ae6dc6cf0dff2d6f96b1250 /lib | |
| parent | b1afbac64b7c4c06959350acc175fb3552012f57 (diff) | |
| download | llvm-c82751dd6761e3db62668b6b1cfddd4f659855b6.tar.gz llvm-c82751dd6761e3db62668b6b1cfddd4f659855b6.tar.bz2 llvm-c82751dd6761e3db62668b6b1cfddd4f659855b6.tar.xz | |
Make demanded-elt simplification for shufflevector slightly stronger. Spotted by inspection.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139768 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp index 66f39be17b..81929bc623 100644 --- a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp +++ b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp @@ -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; |