From 87e98075cc69580c199d8455e4581ce32697eb25 Mon Sep 17 00:00:00 2001
From: Oscar Fuentes <ofv@wanadoo.es>
Date: Sat, 5 Dec 2009 23:19:33 +0000
Subject: Fix for atomic intrinsics detection when using MSVC.

Patch by Michael Beck!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90683 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/modules/CheckAtomic.cmake | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'cmake/modules')

diff --git a/cmake/modules/CheckAtomic.cmake b/cmake/modules/CheckAtomic.cmake
index 27bbaba..6c4da66 100644
--- a/cmake/modules/CheckAtomic.cmake
+++ b/cmake/modules/CheckAtomic.cmake
@@ -1,14 +1,26 @@
 # atomic builtins are required for threading support.
 
 INCLUDE(CheckCXXSourceCompiles)
+
+#ifdef _MSC_VER
+#include <windows.h>
+#endif
 	
 CHECK_CXX_SOURCE_COMPILES("
 int main() {
+#ifdef _MSC_VER
+        volatile LONG val = 1;
+        MemoryBarrier();
+        InterlockedCompareExchange(&val, 0, 1);
+        InterlockedIncrement(&val);
+        InterlockedDecrement(&val);
+#else
         volatile unsigned long val = 1;
         __sync_synchronize();
         __sync_val_compare_and_swap(&val, 1, 0);
         __sync_add_and_fetch(&val, 1);
         __sync_sub_and_fetch(&val, 1);
+#endif
         return 0;
       }
 " LLVM_MULTITHREADED)
-- 
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