Add paranoia checking

llvm-svn: 6856
2003-06-22 20:46:00 +00:00 · 2003-06-22 20:46:00 +00:00 · 92963de6fa
parent 3a8622527c
commit 92963de6fa
1 changed files with 1 additions and 1 deletions
--- a/llvm/lib/Transforms/Scalar/TailDuplication.cpp
+++ b/llvm/lib/Transforms/Scalar/TailDuplication.cpp
@ -303,7 +303,7 @@ Value *TailDup::GetValueInBlock(BasicBlock *BB, Value *OrigVal,
    }

  // Found a value to replace the PHI node with?
-  if (ReplVal) {
+  if (ReplVal && ReplVal != PN) {
    PN->replaceAllUsesWith(ReplVal);
    BBVal = ReplVal;
    if (BBOutVal == PN) BBOutVal = ReplVal;