From 00b1ad2d56f3e39f95c3f61bf511a531ab6a4fa5 Mon Sep 17 00:00:00 2001
From: Zhongxing Xu <xuzhongxing@gmail.com>
Date: Fri, 20 Nov 2009 03:50:46 +0000
Subject: [PATCH] Revert r89437 and add a comment.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89446 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/GRExprEngine.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Analysis/GRExprEngine.cpp b/lib/Analysis/GRExprEngine.cpp
index 8f912c42ce..2b4b5ae1a5 100644
--- a/lib/Analysis/GRExprEngine.cpp
+++ b/lib/Analysis/GRExprEngine.cpp
@@ -1278,7 +1278,8 @@ void GRExprEngine::EvalLocation(ExplodedNodeSet &Dst, Stmt *S,
                                 ExplodedNode* Pred,
                                 const GRState* state, SVal location,
                                 const void *tag, bool isLoad) {
-  if (Checkers.empty()) {
+  // Early checks for performance reason.
+  if (location.isUnknown() || Checkers.empty()) {
     Dst.Add(Pred);
     return;
   }
-- 
2.50.1