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| author | George Koehler <kernigh@gmail.com> | 2020-08-04 18:06:58 +0000 |
|---|---|---|
| committer | Ivan Maidanski <ivmai@mail.ru> | 2021-09-09 08:33:40 +0300 |
| commit | 2bbbef494874d1f652cd6cc9104ad506d24006d6 (patch) | |
| tree | 885439fecff0c58b99c024af616f26f2e16fa955 | |
| parent | 586ab3a28661a178b9d13c465f64c2733a52b3aa (diff) | |
| download | libatomic_ops-2bbbef494874d1f652cd6cc9104ad506d24006d6.tar.gz | |
Implement fetch-CAS for sparc (gcc)
* src/atomic_ops/sysdeps/gcc/sparc.h [!AO_NO_SPARC_V9]
(AO_fetch_compare_and_swap_full): Implement; remove TODO.
| -rw-r--r-- | src/atomic_ops/sysdeps/gcc/sparc.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/atomic_ops/sysdeps/gcc/sparc.h b/src/atomic_ops/sysdeps/gcc/sparc.h index 79eb763..9bd48d4 100644 --- a/src/atomic_ops/sysdeps/gcc/sparc.h +++ b/src/atomic_ops/sysdeps/gcc/sparc.h @@ -61,7 +61,21 @@ AO_compare_and_swap_full(volatile AO_t *addr, AO_t old, AO_t new_val) { } #define AO_HAVE_compare_and_swap_full -/* TODO: implement AO_fetch_compare_and_swap. */ +AO_INLINE AO_t +AO_fetch_compare_and_swap_full(volatile AO_t *addr, AO_t old, AO_t new_val) { + __asm__ __volatile__ ("membar #StoreLoad | #LoadLoad\n\t" +# if defined(__arch64__) + "casx [%1],%2,%0\n\t" +# else + "cas [%1],%2,%0\n\t" /* 32-bit version */ +# endif + "membar #StoreLoad | #StoreStore\n\t" + : "+r" (new_val) + : "r" (addr), "r" (old) + : "memory"); + return new_val; +} +#define AO_HAVE_fetch_compare_and_swap_full #endif /* !AO_NO_SPARC_V9 */ /* TODO: Extend this for SPARC v8 and v9 (V8 also has swap, V9 has CAS, */ |