[INTRIN]

- Implement _mm_sfence, _mm_lfence, __faststorefence (for amd64)
- Don't use __sync_synchronize() for _ReadWriteBarrier, as it issues an mfence instruction and this is not what we want
- Remove "BUGBUG" comment, because the fact that _ReadBarrier and _WriteBarrier are full (compiler) barriers isn't critical.

svn path=/trunk/; revision=50456

diff --git a/reactos/include/crt/mingw32/intrin_x86.h b/reactos/include/crt/mingw32/intrin_x86.h
index 5b6f32d..1be110c 100644 (file)
--- a/reactos/include/crt/mingw32/intrin_x86.h
+++ b/reactos/include/crt/mingw32/intrin_x86.h
@@ -79,22 +79,37 @@ extern "C" {
 #define _alloca(s) __builtin_alloca(s)
 #endif
 
 #define _alloca(s) __builtin_alloca(s)
 #endif
 

-/*** Atomic operations ***/
+/*** Memory barriers ***/

 
 

-#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
-#define _ReadWriteBarrier() __sync_synchronize()
-#else
-__INTRIN_INLINE void _MemoryBarrier(void)
+#ifdef _x86_64
+__INTRIN_INLINE void __faststorefence(void)

 {
 {

-       __asm__ __volatile__("" : : : "memory");
+    long local;
+       __asm__ __volatile__("lock; orl $0, %0;" : : "m"(local));

 }
 }

-#define _ReadWriteBarrier() _MemoryBarrier()

 #endif
 
 #endif
 

-/* BUGBUG: GCC only supports full barriers */
+__INTRIN_INLINE void _mm_lfence(void)
+{
+       __asm__ __volatile__("lfence");
+}
+
+__INTRIN_INLINE void _mm_sfence(void)
+{
+       __asm__ __volatile__("sfence");
+}
+
+__INTRIN_INLINE void _ReadWriteBarrier(void)
+{
+       __asm__ __volatile__("" : : : "memory");
+}
+
+/* GCC only supports full barriers */

 #define _ReadBarrier _ReadWriteBarrier
 #define _WriteBarrier _ReadWriteBarrier
 
 #define _ReadBarrier _ReadWriteBarrier
 #define _WriteBarrier _ReadWriteBarrier
 

+/*** Atomic operations ***/
+

 #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
 
 __INTRIN_INLINE char _InterlockedCompareExchange8(volatile char * const Destination, const char Exchange, const char Comperand)
 #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
 
 __INTRIN_INLINE char _InterlockedCompareExchange8(volatile char * const Destination, const char Exchange, const char Comperand)