diff options
Diffstat (limited to 'erts/include/internal/i386/ethr_membar.h')
| -rw-r--r-- | erts/include/internal/i386/ethr_membar.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/erts/include/internal/i386/ethr_membar.h b/erts/include/internal/i386/ethr_membar.h index d1b72cd538..cd00ab5974 100644 --- a/erts/include/internal/i386/ethr_membar.h +++ b/erts/include/internal/i386/ethr_membar.h @@ -1,7 +1,7 @@ /* * %CopyrightBegin% * - * Copyright Ericsson AB 2011-2016. All Rights Reserved. + * Copyright Ericsson AB 2011-2023. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -31,6 +31,27 @@ #define ETHR_StoreLoad (1 << 2) #define ETHR_StoreStore (1 << 3) +#ifdef ETHR_X86_RUNTIME_CONF__ +#define ETHR_INSTRUCTION_BARRIER ethr_instruction_fence__() + +static __inline__ __attribute__((__always_inline__)) void +ethr_instruction_fence__(void) +{ + ETHR_ASSERT(ETHR_X86_RUNTIME_CONF_HAVE_CPUID__); + +#if ETHR_SIZEOF_PTR == 4 +__asm__ __volatile__("cpuid\n\t" :: "a"(0) : "ebx", "ecx", "edx", "memory"); +#else +__asm__ __volatile__("cpuid\n\t" :: "a"(0) : "rbx", "rcx", "rdx", "memory"); +#endif +} +#else +/* !! Note that we DO NOT define a fallback !! + * + * See the definition of ERTS_THR_INSTRUCTION_BARRIER in erl_threads.h for + * details. */ +#endif + #define ETHR_NO_SSE2_MEMORY_BARRIER__ \ do { \ volatile ethr_sint32_t x__ = 0; \ |