From 74964377a66321c05ac6ddeffc1bd49c859ac221 Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Wed, 24 Jun 2009 22:16:52 +0000
Subject: [PATCH] Make this thread-safe.

llvm-svn: 74129
---
 lib/Analysis/IPA/Andersens.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/Analysis/IPA/Andersens.cpp b/lib/Analysis/IPA/Andersens.cpp
index 8584d06f7a7..a22a2fbd0aa 100644
--- a/lib/Analysis/IPA/Andersens.cpp
+++ b/lib/Analysis/IPA/Andersens.cpp
@@ -65,6 +65,7 @@
 #include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Analysis/Passes.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/System/Atomic.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/SparseBitVector.h"
 #include "llvm/ADT/DenseSet.h"
@@ -284,7 +285,8 @@ namespace {
 
       // Timestamp a node (used for work list prioritization)
       void Stamp() {
-        Timestamp = Counter++;
+        Timestamp = Counter;
+        sys::AtomicIncrement(&Counter);
       }
 
       bool isRep() const {