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Add comment.
author
Evan Cheng
<evan.cheng@apple.com>
Thu, 19 May 2011 18:18:39 +0000
(18:18 +0000)
committer
Evan Cheng
<evan.cheng@apple.com>
Thu, 19 May 2011 18:18:39 +0000
(18:18 +0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131659
91177308
-0d34-0410-b5e6-
96231b3b80d8
lib/Transforms/InstCombine/InstCombineCalls.cpp
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diff --git
a/lib/Transforms/InstCombine/InstCombineCalls.cpp
b/lib/Transforms/InstCombine/InstCombineCalls.cpp
index 4b8a67d94d4dfc6056f14c84cc4cb80e6cd889cd..243937705aceaa4f4a0bedc959523415f27dd1d2 100644
(file)
--- a/
lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/
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;