Fix Transforms/InstCombine/2004-12-08-RemInfiniteLoop.ll

llvm-svn: 18670
2004-12-08 22:20:34 +00:00 · 2004-12-08 22:20:34 +00:00 · 8f30caf549
parent ace35e9be6
commit 8f30caf549
1 changed files with 2 additions and 1 deletions
--- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
@ -309,7 +309,8 @@ static inline Value *dyn_castNegVal(Value *V) {

  // Constants can be considered to be negated values if they can be folded...
  if (Constant *C = dyn_cast<Constant>(V))
-    return ConstantExpr::getNeg(C);
+    if (!isa<UndefValue>(C))
+      return ConstantExpr::getNeg(C);
  return 0;
 }