commit e7c90967b17286b0e8fe21fcbfb9cf898b6e7a96
author Chris Lattner <sabre@nondot.org> Tue Nov 10 01:19:06 2009 +0000
committer Chris Lattner <sabre@nondot.org> Tue Nov 10 01:19:06 2009 +0000
tree 4cfd69123a0e21fb7fcd87d81ba062bb862c9cb2
parent e34537856a544c83513e390ac9552a8bc3823346

don't invalidate PN, rewrite of this code is in progress anyway.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86639 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/JumpThreading.cpp

diff --git a/lib/Transforms/Scalar/JumpThreading.cpp b/lib/Transforms/Scalar/JumpThreading.cpp
index 46d40ef..7a7f407 100644
--- a/lib/Transforms/Scalar/JumpThreading.cpp
+++ b/lib/Transforms/Scalar/JumpThreading.cpp
@@ -223,10 +223,11 @@
       U = PNV;
       
       // See if we can simplify it.
-      if (Value *V = SimplifyInstruction(User, TD)) {
-        User->replaceAllUsesWith(V);
-        User->eraseFromParent();
-      }
+      if (User != PN)
+        if (Value *V = SimplifyInstruction(User, TD)) {
+          User->replaceAllUsesWith(V);
+          User->eraseFromParent();
+        }
     }
     
     PN->replaceAllUsesWith(PNV);