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| author | Chris Lattner <sabre@nondot.org> | 2010-08-28 03:36:51 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-08-28 03:36:51 +0000 |
| commit | 50df36ac0a7131b9208c26b8031066cd5b4b69ed (patch) | |
| tree | fc00f15830b49acec65695add20ccf684934106d /llvm/lib/Transforms/InstCombine | |
| parent | 95bb297c26e0c51dfd351ef70b07268a48b0eb24 (diff) | |
| download | bcm5719-llvm-50df36ac0a7131b9208c26b8031066cd5b4b69ed.tar.gz bcm5719-llvm-50df36ac0a7131b9208c26b8031066cd5b4b69ed.zip | |
for completeness, allow undef also.
llvm-svn: 112351
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) { |
