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| author | Christopher Tetreault <ctetreau@quicinc.com> | 2020-02-03 12:46:42 -0800 |
|---|---|---|
| committer | Christopher Tetreault <ctetreau@quicinc.com> | 2020-02-05 10:00:09 -0800 |
| commit | b03f3fbd6a6b8843469865b16c9eb3af8adc2d3a (patch) | |
| tree | 710d322006b15e4df1b21bf04924f0484d68349f /llvm/lib/Analysis/ValueTracking.cpp | |
| parent | 9986b88e64f30f5d958eef113bae4c8a098eea93 (diff) | |
| download | llvm-b03f3fbd6a6b8843469865b16c9eb3af8adc2d3a.zip llvm-b03f3fbd6a6b8843469865b16c9eb3af8adc2d3a.tar.gz llvm-b03f3fbd6a6b8843469865b16c9eb3af8adc2d3a.tar.bz2 | |
Reapply: [SVE] Fix bug in simplification of scalable vector instructions
This reverts commit a05441038a3a4a011b9421751367c5c797d57137, reapplying
commit 31574d38ac5fa4646cf01dd252a23e682402134f
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index 5b4c810..1761cb6 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -166,6 +166,11 @@ static const Instruction *safeCxtI(const Value *V, const Instruction *CxtI) { static bool getShuffleDemandedElts(const ShuffleVectorInst *Shuf, const APInt &DemandedElts, APInt &DemandedLHS, APInt &DemandedRHS) { + // The length of scalable vectors is unknown at compile time, thus we + // cannot check their values + if (Shuf->getMask()->getType()->getVectorElementCount().Scalable) + return false; + int NumElts = Shuf->getOperand(0)->getType()->getVectorNumElements(); int NumMaskElts = Shuf->getMask()->getType()->getVectorNumElements(); DemandedLHS = DemandedRHS = APInt::getNullValue(NumElts); |