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[INTRIN]

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- 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
This commit is contained in:
Timo Kreuzer 2011-01-21 20:56:36 +00:00
parent 313c5318b3
commit e62f89f35b
1 changed files with 23 additions and 8 deletions
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31
reactos/include/crt/mingw32/intrin_x86.h
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@ -79,22 +79,37 @@ extern "C" {
#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)
{
long local;
__asm__ __volatile__("lock; orl $0, %0;" : : "m"(local));
}
#endif
__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");
}
#define _ReadWriteBarrier() _MemoryBarrier()
#endif
/* BUGBUG: GCC only supports full barriers */
/* GCC only supports full barriers */
#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)