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for completeness, allow undef also.
author
Chris Lattner
<sabre@nondot.org>
Sat, 28 Aug 2010 03:36:51 +0000
(
03:36
+0000)
committer
Chris Lattner
<sabre@nondot.org>
Sat, 28 Aug 2010 03:36:51 +0000
(
03:36
+0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112351
91177308
-0d34-0410-b5e6-
96231b3b80d8
lib/Transforms/InstCombine/InstCombineCasts.cpp
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diff --git
a/lib/Transforms/InstCombine/InstCombineCasts.cpp
b/lib/Transforms/InstCombine/InstCombineCasts.cpp
index 0434d6ba0fdc6926b8c6550e3c9ad3285c423c5e..6c2477d52c77578e8fc5313c1c3fbace31d5f838 100644
(file)
--- 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) {