diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp index 0434d6ba0fd..6c2477d52c7 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp @@ -1381,6 +1381,9 @@ static unsigned getTypeSizeIndex(unsigned Value, const Type *Ty) { static bool CollectInsertionElements(Value *V, unsigned ElementIndex, SmallVectorImpl<Value*> &Elements, const Type *VecEltTy) { + // Undef values never contribute useful bits to the result. + if (isa<UndefValue>(V)) return true; + // If we got down to a value of the right type, we win, try inserting into the // right element. if (V->getType() == VecEltTy) { |
