arch_x86_memory_barrier.h

// Copyright (c) Electronic Arts Inc. All rights reserved.
 
 
#ifndef EASTL_ATOMIC_INTERNAL_ARCH_X86_MEMORY_BARRIER_H
#define EASTL_ATOMIC_INTERNAL_ARCH_X86_MEMORY_BARRIER_H
 
#if defined(EA_PRAGMA_ONCE_SUPPORTED)
    #pragma once
#endif
 
 
 
//
// void EASTL_ARCH_ATOMIC_CPU_MB()
//
#if defined(EA_COMPILER_MSVC)
 
    #if 1
 
        // 4459 : declaration of 'identifier' hides global declaration
        // 4456 : declaration of 'identifier' hides previous local declaration
        #define EASTL_ARCH_ATOMIC_CPU_MB()              \
            {                                           \
                EA_DISABLE_VC_WARNING(4459 4456);       \
                volatile long _;                        \
                _InterlockedExchangeAdd(&_, 0);         \
                EA_RESTORE_VC_WARNING();                \
            }
 
    #else
 
        #define EASTL_ARCH_ATOMIC_CPU_MB()              \
            EASTL_ATOMIC_COMPILER_BARRIER();            \
            _mm_mfence();                               \
            EASTL_ATOMIC_COMPILER_BARRIER()
 
    #endif
 
#elif defined(__clang__) || defined(EA_COMPILER_GNUC)
 
    #if defined(EA_PROCESSOR_X86)
 
        #define EASTL_ARCH_ATOMIC_CPU_MB()              \
            __asm__ __volatile__ ("lock; addl $0, -4(%%esp)" ::: "memory", "cc")
 
    #elif defined(EA_PROCESSOR_X86_64)
 
        #define EASTL_ARCH_ATOMIC_CPU_MB()              \
            __asm__ __volatile__ ("lock; addl $0, -8(%%rsp)" ::: "memory", "cc")
 
    #else
 
        #define EASTL_ARCH_ATOMIC_CPU_MB()              \
            __asm__ __volatile__ ("mfence" ::: "memory")
 
    #endif
 
 
#endif
 
 
//
// void EASTL_ARCH_ATOMIC_CPU_WMB()
//
#define EASTL_ARCH_ATOMIC_CPU_WMB()             \
    EASTL_ATOMIC_COMPILER_BARRIER()
 
 
//
// void EASTL_ARCH_ATOMIC_CPU_RMB()
//
#define EASTL_ARCH_ATOMIC_CPU_RMB()             \
    EASTL_ATOMIC_COMPILER_BARRIER()
 
 
#endif /* EASTL_ATOMIC_INTERNAL_ARCH_X86_MEMORY_BARRIER_H */