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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 | 157d4ead36ace978a01d80a29aa1b53c832ebafb (patch) | |
| tree | 40c00dc3986ea6323fbb76ed29de42236632db37 /lib/Transforms/InstCombine | |
| parent | b188a3789e2fc64ec7088a220c4c428c41d86faa (diff) | |
| download | llvm-157d4ead36ace978a01d80a29aa1b53c832ebafb.tar.gz llvm-157d4ead36ace978a01d80a29aa1b53c832ebafb.tar.bz2 llvm-157d4ead36ace978a01d80a29aa1b53c832ebafb.tar.xz | |
for completeness, allow undef also.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112351 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/InstCombine')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineCasts.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineCasts.cpp b/lib/Transforms/InstCombine/InstCombineCasts.cpp index 0434d6ba0f..6c2477d52c 100644 --- a/lib/Transforms/InstCombine/InstCombineCasts.cpp +++ b/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) { |