From: Ivan Maidanski <ivmai@mail.ru>
Date: Mon, 8 Oct 2012 14:09:40 +0000 (+0400)
Subject: Use built-in __sync CAS for double-CAS if AO_USE_SYNC_CAS_BUILTIN for x86
X-Git-Tag: libatomic_ops-7_4_0~72^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=03de7740c21fe6e4a6bdd7af09d5ff5189d4d70e;p=libatomic_ops

Use built-in __sync CAS for double-CAS if AO_USE_SYNC_CAS_BUILTIN for x86

* src/atomic_ops/sysdeps/gcc/x86.h
(AO_compare_double_and_swap_double_full): Do not define if
AO_USE_SYNC_CAS_BUILTIN, define AO_double_compare_and_swap_full
(based on __sync_bool_compare_and_swap) instead (for x86).
---

diff --git a/src/atomic_ops/sysdeps/gcc/x86.h b/src/atomic_ops/sysdeps/gcc/x86.h
index 188ee0b..ad28d6d 100644
--- a/src/atomic_ops/sysdeps/gcc/x86.h
+++ b/src/atomic_ops/sysdeps/gcc/x86.h
@@ -179,7 +179,7 @@ AO_fetch_compare_and_swap_full(volatile AO_t *addr, AO_t old_val,
 }
 #define AO_HAVE_fetch_compare_and_swap_full
 
-#if !defined(__x86_64__)
+#if !defined(__x86_64__) && !defined(AO_USE_SYNC_CAS_BUILTIN)
 # include "../standard_ao_double_t.h"
 
   /* Returns nonzero if the comparison succeeded.       */
@@ -246,7 +246,7 @@ AO_fetch_compare_and_swap_full(volatile AO_t *addr, AO_t old_val,
 
 # define AO_T_IS_INT
 
-#elif defined(__ILP32__)
+#elif defined(__ILP32__) || !defined(__x86_64__)
 # include "../standard_ao_double_t.h"
 
   /* X32 has native support for 64-bit integer operations (AO_double_t  */