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Bug fix. Only safe to perform extension uses optimization if the source of extension...
author
Evan Cheng
<evan.cheng@apple.com>
Wed, 12 Dec 2007 00:51:06 +0000
(
00:51
+0000)
committer
Evan Cheng
<evan.cheng@apple.com>
Wed, 12 Dec 2007 00:51:06 +0000
(
00:51
+0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44896
91177308
-0d34-0410-b5e6-
96231b3b80d8
lib/Transforms/Scalar/CodeGenPrepare.cpp
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diff --git
a/lib/Transforms/Scalar/CodeGenPrepare.cpp
b/lib/Transforms/Scalar/CodeGenPrepare.cpp
index 594c017ba8a85d2d0a4e9a6371a1ed9fcf4d1bf8..37a645f3ce813b492bfe975e4b770f13b3582f37 100644
(file)
--- a/
lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/
lib/Transforms/Scalar/CodeGenPrepare.cpp
@@
-929,6
+929,11
@@
bool CodeGenPrepare::OptimizeExtUses(Instruction *I) {
if (Src->hasOneUse())
return false;
+ // Only safe to perform the optimization if the source is also defined in
+ // this block.
+ if (DefBB != cast<Instruction>(Src)->getParent())
+ return false;
+
bool DefIsLiveOut = false;
for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
UI != E; ++UI) {