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v3.0.x: opal/asm: work around possible gcc compiler bug #6041

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Merged
merged 1 commit into from
Jan 10, 2019
Merged

v3.0.x: opal/asm: work around possible gcc compiler bug #6041

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9 changes: 9 additions & 0 deletions opal/include/opal/sys/gcc_builtin/atomic.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@
* reserved.
* Copyright (c) 2016 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2018 Triad National Security, LLC. All rights
* reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
Expand Down Expand Up @@ -53,7 +55,14 @@ static inline void opal_atomic_mb(void)

static inline void opal_atomic_rmb(void)
{
#if OPAL_ASSEMBLY_ARCH == OPAL_X86_64
/* work around a bug in older gcc versions where ACQUIRE seems to get
* treated as a no-op instead of being equivalent to
* __asm__ __volatile__("": : :"memory") */
__atomic_thread_fence (__ATOMIC_SEQ_CST);
#else
__atomic_thread_fence (__ATOMIC_ACQUIRE);
#endif
}

static inline void opal_atomic_wmb(void)
Expand Down