From: Chris Lattner <sabre@nondot.org>
Date: Sun, 22 Jun 2003 20:46:00 +0000 (+0000)
Subject: Add paranoia checking
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=066ab6ac80ae93af64857c5822efc81298eaca32;p=oota-llvm.git

Add paranoia checking


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6856 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/TailDuplication.cpp b/lib/Transforms/Scalar/TailDuplication.cpp
index 17237431a91..e736f970af5 100644
--- a/lib/Transforms/Scalar/TailDuplication.cpp
+++ b/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;