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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Description: Memory barriers for Windows
* Author: Rickard Green
*/
#if (!defined(ETHR_WIN_MEMBAR_H__) \
&& (defined(_MSC_VER) && _MSC_VER >= 1400) \
&& (defined(_M_AMD64) \
|| defined(_M_IA64) \
|| defined(ETHR_HAVE__INTERLOCKEDCOMPAREEXCHANGE)))
#define ETHR_WIN_MEMBAR_H__
#define ETHR_LoadLoad (1 << 0)
#define ETHR_LoadStore (1 << 1)
#define ETHR_StoreLoad (1 << 2)
#define ETHR_StoreStore (1 << 3)
#include <intrin.h>
#undef ETHR_COMPILER_BARRIER
#define ETHR_COMPILER_BARRIER _ReadWriteBarrier()
#pragma intrinsic(_ReadWriteBarrier)
#pragma intrinsic(_InterlockedCompareExchange)
#define ETHR_MB_USING_INTERLOCKED__ \
do { \
volatile long x___ = 0; \
(void) _InterlockedCompareExchange(&x___, 2, 1); \
} while (0)
#if defined(_M_IA64)
#define ETHR_MEMBAR(B) __mf()
#elif defined(_M_AMD64) || defined(_M_IX86)
#include <emmintrin.h>
#include <mmintrin.h>
#if ETHR_SIZEOF_PTR == 4
# define ETHR_NO_SSE2_MB__ ETHR_MB_USING_INTERLOCKED__
#endif
#pragma intrinsic(_mm_mfence)
#pragma intrinsic(_mm_sfence)
#pragma intrinsic(_mm_lfence)
static __forceinline void
ethr_cfence__(void)
{
_ReadWriteBarrier();
}
static __forceinline void
ethr_mfence__(void)
{
#if ETHR_SIZEOF_PTR == 4
if (ETHR_X86_RUNTIME_CONF_HAVE_NO_SSE2__)
ETHR_NO_SSE2_MB__;
else
#endif
_mm_mfence();
}
static __forceinline void
ethr_sfence__(void)
{
#if ETHR_SIZEOF_PTR == 4
if (ETHR_X86_RUNTIME_CONF_HAVE_NO_SSE2__)
ETHR_NO_SSE2_MB__;
else
#endif
_mm_sfence();
}
static __forceinline void
ethr_lfence__(void)
{
#if ETHR_SIZEOF_PTR == 4
if (ETHR_X86_RUNTIME_CONF_HAVE_NO_SSE2__)
ETHR_NO_SSE2_MB__;
else
#endif
_mm_lfence();
}
#define ETHR_X86_OUT_OF_ORDER_MEMBAR(B) \
ETHR_CHOOSE_EXPR((B) == ETHR_StoreStore, \
ethr_sfence__(), \
ETHR_CHOOSE_EXPR((B) == ETHR_LoadLoad, \
ethr_lfence__(), \
ethr_mfence__()))
#ifdef ETHR_X86_OUT_OF_ORDER
#define ETHR_MEMBAR(B) \
ETHR_X86_OUT_OF_ORDER_MEMBAR((B))
#else /* !ETHR_X86_OUT_OF_ORDER (the default) */
/*
* We assume that only stores before loads may be reordered. That is,
* we assume that *no* instructions like these are used:
* - CLFLUSH,
* - streaming stores executed with non-temporal move,
* - string operations, or
* - other instructions which aren't LoadLoad, LoadStore, and StoreStore
* ordered by themselves
* If such instructions are used, either insert memory barriers
* using ETHR_X86_OUT_OF_ORDER_MEMBAR() at appropriate places, or
* define ETHR_X86_OUT_OF_ORDER. For more info see Intel 64 and IA-32
* Architectures Software Developer's Manual; Vol 3A; Chapter 8.2.2.
*/
#define ETHR_MEMBAR(B) \
ETHR_CHOOSE_EXPR((B) & ETHR_StoreLoad, ethr_mfence__(), ethr_cfence__())
#endif
#else /* No knowledge about platform; use interlocked fallback */
#define ETHR_MEMBAR(B) ETHR_MB_USING_INTERLOCKED__
#define ETHR_READ_DEPEND_MEMORY_BARRIER ETHR_MB_USING_INTERLOCKED__
#endif
#endif /* ETHR_WIN_MEMBAR_H__ */
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