[llvm-commits] [llvm] r71856 - /llvm/trunk/include/llvm/System/Atomic.h

[Anton Korobeynikov]

Author: asl
Date: Fri May 15 06:04:52 2009
New Revision: 71856

URL: http://llvm.org/viewvc/llvm-project?rev=71856&view=rev
Log:
Unbreak mingw build

Modified:
    llvm/trunk/include/llvm/System/Atomic.h

Modified: llvm/trunk/include/llvm/System/Atomic.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/System/Atomic.h?rev=71856&r1=71855&r2=71856&view=diff

==============================================================================
--- llvm/trunk/include/llvm/System/Atomic.h (original)
+++ llvm/trunk/include/llvm/System/Atomic.h Fri May 15 06:04:52 2009
@@ -27,12 +27,12 @@
 
 namespace llvm {
   namespace sys {
-    
+
 #if !defined(ENABLE_THREADS) || ENABLE_THREADS == 0
     inline void MemoryFence() {
       return;
     }
-    
+
     typedef uint32_t cas_flag;
     inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
       cas_flag result = *dest;
@@ -40,22 +40,22 @@
         *dest = exc;
       return result;
     }
-    
+
 #elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
     inline void MemoryFence() {
       __sync_synchronize();
     }
-    
+
     typedef volatile uint32_t cas_flag;
     inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
       return __sync_val_compare_and_swap(dest, exc, c);
     }
-    
+
 #elif defined(__APPLE__)
     inline void MemoryFence() {
       OSMemoryBarrier();
     }
-    
+
     typedef volatile int32_t cas_flag;
     inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
       cas_flag old = *dest;
@@ -63,11 +63,18 @@
       return old;
     }
 #elif defined(LLVM_ON_WIN32)
-#warning Memory fence implementation requires Windows 2003 or later.
     inline void MemoryFence() {
+#ifdef _MSC_VER
       MemoryBarrier();
+#elif 0
+      // FIXME: Requires SSE2 support
+      __asm__ __volatile__("mfence":::"memory");
+#else
+      // FIXME: just temporary workaround. We need to emit some fence...
+      __asm__ __volatile__("":::"memory");
+#endif
     }
-    
+
     typedef volatile long cas_flag;
     inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
       return InterlockedCompareExchange(dest, exc, c);
@@ -75,8 +82,8 @@
 #else
 #error No memory atomics implementation for your platform!
 #endif
-    
+
   }
 }
 
-#endif
\ No newline at end of file
+#endif