From 5f037b6439856fa4a8414c00838cfbe5b794b560 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 15 Nov 2009 19:57:43 +0000
Subject: fix a bug handling 'not x' when x is undef.

llvm-svn: 88864
---
 llvm/lib/Transforms/Scalar/JumpThreading.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'llvm/lib')

diff --git a/llvm/lib/Transforms/Scalar/JumpThreading.cpp b/llvm/lib/Transforms/Scalar/JumpThreading.cpp
index d5ce86aca0c..de4c118b69d 100644
--- a/llvm/lib/Transforms/Scalar/JumpThreading.cpp
+++ b/llvm/lib/Transforms/Scalar/JumpThreading.cpp
@@ -350,8 +350,9 @@ ComputeValueKnownInPredecessors(Value *V, BasicBlock *BB,PredValueInfo &Result){
 
       // Invert the known values.
       for (unsigned i = 0, e = Result.size(); i != e; ++i)
-        Result[i].first =
-          cast<ConstantInt>(ConstantExpr::getNot(Result[i].first));
+        if (Result[i].first)
+          Result[i].first =
+            cast<ConstantInt>(ConstantExpr::getNot(Result[i].first));
       return true;
     }
   }
-- 
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