From: Ivan Maidanski <ivmai@mail.ru>
Date: Wed, 6 Dec 2017 08:05:38 +0000 (+0300)
Subject: Define double-word CAS for all clang/aarch64 versions
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=baa9851fcb2552abe0d8eb69324af273f4edba4f;p=libatomic_ops

Define double-word CAS for all clang/aarch64 versions
(fix commit 46d43dc)

* src/atomic_ops/sysdeps/gcc/aarch64.h [__clang__]
(AO_GCC_HAVE_double_SYNC_CAS): Define for all Clang versions.
---

diff --git a/src/atomic_ops/sysdeps/gcc/aarch64.h b/src/atomic_ops/sysdeps/gcc/aarch64.h
index 010fcdd..90e9e06 100644
--- a/src/atomic_ops/sysdeps/gcc/aarch64.h
+++ b/src/atomic_ops/sysdeps/gcc/aarch64.h
@@ -211,10 +211,15 @@
 
 #endif /* !AO_PREFER_BUILTIN_ATOMICS && !__clang__ */
 
+/* As of clang-5.0, __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16                 */
+/* macro is still missing (while the double-word CAS is available).     */
+#if defined(__clang__)
+# define AO_GCC_HAVE_double_SYNC_CAS
+#endif
+
 #if (defined(__clang__) && !AO_CLANG_PREREQ(3, 8)) || defined(__APPLE_CC__)
   /* __GCC_HAVE_SYNC_COMPARE_AND_SWAP_n macros are missing.     */
 # define AO_GCC_FORCE_HAVE_CAS
-# define AO_GCC_HAVE_double_SYNC_CAS
 #endif
 
 #include "generic.h"