* sysdep/sh/locks.h (__cas_lock): Remove.
(__cas_start_atomic, __cas_end_atomic): Likewise.
(compare_and_swap): Call __sync_bool_compare_and_swap.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@188640
138bc75d-0d04-0410-961f-
82ee72b054a4
+2012-06-14 Kaz Kojima <kkojima@gcc.gnu.org>
+
+ * sysdep/sh/locks.h (__cas_lock): Remove.
+ (__cas_start_atomic, __cas_end_atomic): Likewise.
+ (compare_and_swap): Call __sync_bool_compare_and_swap.
+
2012-05-21 Benjamin Kosnik <bkoz@redhat.com>
PR libstdc++/52700
typedef size_t obj_addr_t; /* Integer type big enough for object */
/* address. */
-static unsigned char __cas_lock = 0;
-
-inline static void
-__cas_start_atomic (void)
-{
- unsigned int val;
-
- do
- __asm__ __volatile__ ("tas.b @%1; movt %0"
- : "=r" (val)
- : "r" (&__cas_lock)
- : "memory");
- while (val == 0);
-}
-
-inline static void
-__cas_end_atomic (void)
-{
- __asm__ __volatile__ (" " : : : "memory");
- __cas_lock = 0;
-}
-
inline static bool
compare_and_swap (volatile obj_addr_t *addr, obj_addr_t old,
obj_addr_t new_val)
{
- bool ret;
-
- __cas_start_atomic ();
- if (*addr != old)
- ret = false;
- else
- {
- *addr = new_val;
- ret = true;
- }
- __cas_end_atomic ();
-
- return ret;
+ return __sync_bool_compare_and_swap (addr, old, new_val);
}
inline static void