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Bug fix. Only safe to perform extension uses optimization if the source of extension is also defined in the same BB as the extension.

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llvm-svn: 44896
This commit is contained in:
Evan Cheng 2007-12-12 00:51:06 +00:00
parent fcce408d12
commit d6ecb2e58d
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Scalar/CodeGenPrepare.cpp
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@ -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) {