diff options
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp index f6c6bab73a0..5dea7de6f05 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp @@ -1464,7 +1464,8 @@ Instruction *InstCombiner::visitShuffleVectorInst(ShuffleVectorInst &SVI) { if (isRHSID) return replaceInstUsesWith(SVI, RHS); } - if (isa<UndefValue>(RHS) && CanEvaluateShuffled(LHS, Mask)) { + if (isa<UndefValue>(RHS) && !SVI.increasesLength() && + CanEvaluateShuffled(LHS, Mask)) { Value *V = EvaluateInDifferentElementOrder(LHS, Mask); return replaceInstUsesWith(SVI, V); } |
