[llvm-commits] [llvm] r59705 - /llvm/trunk/lib/Analysis/ConstantFolding.cpp

[Nick Lewycky]

Author: nicholas
Date: Wed Nov 19 22:36:13 2008
New Revision: 59705

URL: http://llvm.org/viewvc/llvm-project?rev=59705&view=rev
Log:
undef beats zero. Fix this missed optimization opportunity. Patch by Matt Elder!

Modified:
    llvm/trunk/lib/Analysis/ConstantFolding.cpp

Modified: llvm/trunk/lib/Analysis/ConstantFolding.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ConstantFolding.cpp?rev=59705&r1=59704&r2=59705&view=diff

==============================================================================
--- llvm/trunk/lib/Analysis/ConstantFolding.cpp (original)
+++ llvm/trunk/lib/Analysis/ConstantFolding.cpp Wed Nov 19 22:36:13 2008
@@ -281,7 +281,7 @@
 Constant *llvm::ConstantFoldInstruction(Instruction *I, const TargetData *TD) {
   if (PHINode *PN = dyn_cast<PHINode>(I)) {
     if (PN->getNumIncomingValues() == 0)
-      return Constant::getNullValue(PN->getType());
+      return UndefValue::get(PN->getType());
 
     Constant *Result = dyn_cast<Constant>(PN->getIncomingValue(0));
     if (Result == 0) return 0;