From 17388a61b270a21ee711cd51e003c17d2b3bdf29 Mon Sep 17 00:00:00 2001
From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Mon, 3 Mar 2014 18:02:34 +0000
Subject: Revert "[C++11] Replace LLVM atomics with std::atomic."

Breaks the MSVC build.
DataStream.cpp(44): error C2552: 'llvm::Statistic::Value' : non-aggregates cannot be initialized with initializer list

llvm-svn: 202731
---
 llvm/lib/Support/ManagedStatic.cpp | 3 ++-
 llvm/lib/Support/Statistic.cpp     | 2 +-
 llvm/lib/Support/Threading.cpp     | 6 +++---
 llvm/lib/Support/Timer.cpp         | 4 ++--
 4 files changed, 8 insertions(+), 7 deletions(-)

(limited to 'llvm/lib/Support')

diff --git a/llvm/lib/Support/ManagedStatic.cpp b/llvm/lib/Support/ManagedStatic.cpp
index c19f8cb4859..098cccb68df 100644
--- a/llvm/lib/Support/ManagedStatic.cpp
+++ b/llvm/lib/Support/ManagedStatic.cpp
@@ -13,6 +13,7 @@
 
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Config/config.h"
+#include "llvm/Support/Atomic.h"
 #include <cassert>
 using namespace llvm;
 
@@ -27,7 +28,7 @@ void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
       void* tmp = Creator ? Creator() : 0;
 
       TsanHappensBefore(this);
-      std::atomic_thread_fence(std::memory_order_seq_cst);
+      sys::MemoryFence();
 
       // This write is racy against the first read in the ManagedStatic
       // accessors. The race is benign because it does a second read after a
diff --git a/llvm/lib/Support/Statistic.cpp b/llvm/lib/Support/Statistic.cpp
index 9d075736b30..56c3b0f5659 100644
--- a/llvm/lib/Support/Statistic.cpp
+++ b/llvm/lib/Support/Statistic.cpp
@@ -76,7 +76,7 @@ void Statistic::RegisterStatistic() {
       StatInfo->addStatistic(this);
 
     TsanHappensBefore(this);
-    std::atomic_thread_fence(std::memory_order_seq_cst);
+    sys::MemoryFence();
     // Remember we have been registered.
     TsanIgnoreWritesBegin();
     Initialized = true;
diff --git a/llvm/lib/Support/Threading.cpp b/llvm/lib/Support/Threading.cpp
index 15dd8a98052..9d7ac6c18de 100644
--- a/llvm/lib/Support/Threading.cpp
+++ b/llvm/lib/Support/Threading.cpp
@@ -13,8 +13,8 @@
 
 #include "llvm/Support/Threading.h"
 #include "llvm/Config/config.h"
+#include "llvm/Support/Atomic.h"
 #include "llvm/Support/Mutex.h"
-#include <atomic>
 #include <cassert>
 
 using namespace llvm;
@@ -31,7 +31,7 @@ bool llvm::llvm_start_multithreaded() {
 
   // We fence here to ensure that all initialization is complete BEFORE we
   // return from llvm_start_multithreaded().
-  std::atomic_thread_fence(std::memory_order_seq_cst);
+  sys::MemoryFence();
   return true;
 #else
   return false;
@@ -44,7 +44,7 @@ void llvm::llvm_stop_multithreaded() {
 
   // We fence here to insure that all threaded operations are complete BEFORE we
   // return from llvm_stop_multithreaded().
-  std::atomic_thread_fence(std::memory_order_seq_cst);
+  sys::MemoryFence();
 
   multithreaded_mode = false;
   delete global_lock;
diff --git a/llvm/lib/Support/Timer.cpp b/llvm/lib/Support/Timer.cpp
index 03845f21f2d..0456f5d6383 100644
--- a/llvm/lib/Support/Timer.cpp
+++ b/llvm/lib/Support/Timer.cpp
@@ -81,14 +81,14 @@ raw_ostream *llvm::CreateInfoOutputFile() {
 static TimerGroup *DefaultTimerGroup = 0;
 static TimerGroup *getDefaultTimerGroup() {
   TimerGroup *tmp = DefaultTimerGroup;
-  std::atomic_thread_fence(std::memory_order_seq_cst);
+  sys::MemoryFence();
   if (tmp) return tmp;
   
   llvm_acquire_global_lock();
   tmp = DefaultTimerGroup;
   if (!tmp) {
     tmp = new TimerGroup("Miscellaneous Ungrouped Timers");
-    std::atomic_thread_fence(std::memory_order_seq_cst);
+    sys::MemoryFence();
     DefaultTimerGroup = tmp;
   }
   llvm_release_global_lock();
-- 
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