diff options
| author | Andrew W. Nosenko <andrew.w.nosenko@gmail.com> | 2012-04-26 17:02:56 +0300 |
|---|---|---|
| committer | Martin Sustrik <sustrik@250bpm.com> | 2012-04-29 07:30:37 +0200 |
| commit | cdbaa67ff5fdb7cebab670e6f7906d9e81ae7f0a (patch) | |
| tree | e7b925bf24ecf966577c06333cb22f7e1b208f6d /src/atomic_counter.hpp | |
| parent | 98d4e212bc6379888c006aadb89eb1b96e0b3ddb (diff) | |
atomic: prefer GCC __sync_*() builtins over inline asm
Use GCC __sync_*() builtins when compiler claims to be GCC (GCC itself,
Clang...)
It can be disabled explicitly by using XS_DISABLE_GCC_SYNC_BUILTINS
define. Just for any case.
* src/atomic_counter.hpp [__GNUC__ && !XS_DISABLE_GCC_SYNC_BUILTINS]:
(atomic_counter_t::add):
(atomic_counter_t::sub):
* src/atomic_ptr.hpp [__GNUC__ && !XS_DISABLE_GCC_SYNC_BUILTINS]:
(atomic_ptr_t::xchg):
(atomic_ptr_t::cas):
Prefer GCC __sync_*() builtins over inline asm.
Diffstat (limited to 'src/atomic_counter.hpp')
| -rw-r--r-- | src/atomic_counter.hpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/atomic_counter.hpp b/src/atomic_counter.hpp index 07002af..bd89f72 100644 --- a/src/atomic_counter.hpp +++ b/src/atomic_counter.hpp @@ -81,6 +81,8 @@ namespace xs #if defined XS_ATOMIC_COUNTER_WINDOWS old_value = InterlockedExchangeAdd ((LONG*) &value, increment_); +#elif defined __GNUC__ && !defined XS_DISABLE_GCC_SYNC_BUILTINS + old_value = __sync_fetch_and_add (&value, increment_); #elif defined XS_ATOMIC_COUNTER_ATOMIC_H integer_t new_value = atomic_add_32_nv (&value, increment_); old_value = new_value - increment_; @@ -121,6 +123,9 @@ namespace xs LONG delta = - ((LONG) decrement); integer_t old = InterlockedExchangeAdd ((LONG*) &value, delta); return old - decrement != 0; +#elif defined __GNUC__ && !defined XS_DISABLE_GCC_SYNC_BUILTINS + integer_t new_value = __sync_sub_and_fetch (&value, decrement); + return (new_value != 0); #elif defined XS_ATOMIC_COUNTER_ATOMIC_H int32_t delta = - ((int32_t) decrement); integer_t nv = atomic_add_32_nv (&value, delta); |