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Use __sync_add_and_fetch and __sync_sub_and_fetch when they are available

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These functions may be available as inlines or as libgcc functions. In the
former case, a __GCC_HAVE_SYNC_COMPARE_AND_SWAP_n macro is defined. But we
still want to use these functions in the latter case, when we don't have
our own implementation.
This commit is contained in:
Mike Hommey
2012-03-26 17:03:41 +02:00
committed by Jason Evans
parent 1e6138c88c
commit c1e567bda0
3 changed files with 65 additions and 3 deletions
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18
include/jemalloc/internal/atomic.h
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@@ -87,6 +87,20 @@ atomic_sub_uint64(uint64_t *p, uint64_t x)
return (x);
}
#elif (defined(JE_FORCE_SYNC_COMPARE_AND_SWAP_8))
JEMALLOC_INLINE uint64_t
atomic_add_uint64(uint64_t *p, uint64_t x)
{
return (__sync_add_and_fetch(p, x));
}
JEMALLOC_INLINE uint64_t
atomic_sub_uint64(uint64_t *p, uint64_t x)
{
return (__sync_sub_and_fetch(p, x));
}
#else
# if (LG_SIZEOF_PTR == 3)
# error "Missing implementation for 64-bit atomic operations"
@@ -150,9 +164,7 @@ atomic_sub_uint32(uint32_t *p, uint32_t x)
return (x);
}
#elif (defined __SH4__ || defined __mips__) && (__GNUC__ > 4 || \
(__GNUC__ == 4 && (__GNUC_MINOR__ > 1 || (__GNUC_MINOR__ == 1 && \
__GNUC_PATCHLEVEL__ > 1))))
#elif (defined(JE_FORCE_SYNC_COMPARE_AND_SWAP_4))
JEMALLOC_INLINE uint32_t
atomic_add_uint32(uint32_t *p, uint32_t x)
{