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util/u_atomic: Add implementation of __sync_val_compare_and_swap_8

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Needed for 32-bit PowerPC.

Cc: "17.2" <mesa-stable@lists.freedesktop.org>
Fixes: a6a38a038b ("util/u_atomic: provide 64bit atomics where
they're missing")
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
This commit is contained in:
Matt Turner 2017-09-14 11:00:26 -07:00
parent d075a4089e
commit 1bbe180873
1 changed files with 14 additions and 0 deletions
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14
src/util/u_atomic.c
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@ -60,6 +60,20 @@ __sync_sub_and_fetch_8(uint64_t *ptr, uint64_t val)
return r;
}
WEAK uint64_t
__sync_val_compare_and_swap_8(uint64_t *ptr, uint64_t oldval, uint64_t newval)
{
uint64_t r;
pthread_mutex_lock(&sync_mutex);
r = *ptr;
if (*ptr == oldval)
*ptr = newval;
pthread_mutex_unlock(&sync_mutex);
return r;
}
WEAK uint64_t
__atomic_fetch_add_8(uint64_t *ptr, uint64_t val, int memorder)
{