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authorEvan Cheng <evan.cheng@apple.com>2011-05-19 18:18:39 +0000
committerEvan Cheng <evan.cheng@apple.com>2011-05-19 18:18:39 +0000
commitdc867ae1fc2f88b5619d43c39b1974918b68fbeb (patch)
tree823dc62feb6072f9444f4e45cc74e6fd65fb2e96 /llvm/lib
parent92bb12ca3e6dfbbebf906257f758d0b1a30ed425 (diff)
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llvm-svn: 131659
Diffstat (limited to 'llvm/lib')
-rw-r--r--llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
index 4b8a67d94d4..243937705ac 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -597,6 +597,7 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
case Intrinsic::x86_sse41_pmovzxbw:
case Intrinsic::x86_sse41_pmovzxwd:
case Intrinsic::x86_sse41_pmovzxdq: {
+ // pmov{s|z}x ignores the upper half of their input vectors.
unsigned VWidth =
cast<VectorType>(II->getArgOperand(0)->getType())->getNumElements();
unsigned LowHalfElts = VWidth / 2;
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