X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2FStatistic.h;h=b54d10b9dd334d0317054f81c82c3504a3517007;hb=acb8d9fbe3853394a2537985349993580309b8cd;hp=9bbda986a819e9becf1cf082a4d84f3615f68f59;hpb=b35e4e84727ff5ba3621b39caa622baef431ca45;p=oota-llvm.git

diff --git a/include/llvm/ADT/Statistic.h b/include/llvm/ADT/Statistic.h
index 9bbda986a81..b54d10b9dd3 100644
--- a/include/llvm/ADT/Statistic.h
+++ b/include/llvm/ADT/Statistic.h
@@ -27,6 +27,7 @@
 #define LLVM_ADT_STATISTIC_H
 
 #include "llvm/Support/Atomic.h"
+#include "llvm/Support/Valgrind.h"
 
 namespace llvm {
 class raw_ostream;
@@ -84,11 +85,13 @@ public:
   }
 
   const Statistic &operator+=(const unsigned &V) {
+    if (!V) return *this;
     sys::AtomicAdd(&Value, V);
     return init();
   }
 
   const Statistic &operator-=(const unsigned &V) {
+    if (!V) return *this;
     sys::AtomicAdd(&Value, -V);
     return init();
   }
@@ -108,6 +111,7 @@ protected:
     bool tmp = Initialized;
     sys::MemoryFence();
     if (!tmp) RegisterStatistic();
+    TsanHappensAfter(this);
     return *this;
   }
   void RegisterStatistic();