Author: evancheng
Date: Tue Dec 11 18:51:06 2007
New Revision: 44896
URL: http://llvm.org/viewvc/llvm-project?rev=44896&view=rev
Log:
Bug fix. Only safe to perform extension uses optimization if the source of
extension is also defined in the same BB as the extension.
Modified:
llvm/trunk/lib/Transforms/Scalar/CodeGenPrepare.cpp
Modified: llvm/trunk/lib/Transforms/Scalar/CodeGenPrepare.cpp
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/CodeGenPrepare.cpp?rev=44896&r1=44895&r2=44896&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/CodeGenPrepare.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/CodeGenPrepare.cpp Tue Dec 11 18:51:06 2007
@@ -929,6 +929,11 @@
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) {
_______________________________________________
llvm-commits mailing list
llvm-commits@cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
