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| author | Eli Friedman <efriedma@quicinc.com> | 2020-04-22 17:15:39 -0700 |
|---|---|---|
| committer | Eli Friedman <efriedma@quicinc.com> | 2020-04-23 17:47:37 -0700 |
| commit | 3291efc2b3bb7f438f9076f6c4484cadbbda899f (patch) | |
| tree | be84d9bcfbcff795b63bd35572b507385a49863b /llvm/lib/Analysis/ValueTracking.cpp | |
| parent | 1b2c7877a4dd3da2ba7462d65a48341f59c6cc61 (diff) | |
| download | llvm-3291efc2b3bb7f438f9076f6c4484cadbbda899f.zip llvm-3291efc2b3bb7f438f9076f6c4484cadbbda899f.tar.gz llvm-3291efc2b3bb7f438f9076f6c4484cadbbda899f.tar.bz2 | |
[ValueTracking] Handle shufflevector constants in ComputeNumSignBits
Differential Revision: https://reviews.llvm.org/D78688
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index ddce360..056111b 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -2906,7 +2906,11 @@ static unsigned ComputeNumSignBitsImpl(const Value *V, case Instruction::ShuffleVector: { // Collect the minimum number of sign bits that are shared by every vector // element referenced by the shuffle. - auto *Shuf = cast<ShuffleVectorInst>(U); + auto *Shuf = dyn_cast<ShuffleVectorInst>(U); + if (!Shuf) { + // FIXME: Add support for shufflevector constant expressions. + return 1; + } APInt DemandedLHS, DemandedRHS; // For undef elements, we don't know anything about the common state of // the shuffle result. |