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[patch committed libjava] Update sysdep/sh/locks.h with atomic builtins
- From: Kaz Kojima <kkojima at rr dot iij4u dot or dot jp>
- To: java-patches at gcc dot gnu dot org
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Fri, 15 Jun 2012 07:59:23 +0900 (JST)
- Subject: [patch committed libjava] Update sysdep/sh/locks.h with atomic builtins
Hi,
I've applied the attached patch which updates libjava/sysdep/sh/locks.h
with new atomic builtins. Tested on sh4-unknown-linux-gnu with no new
failures.
Regards,
kaz
--
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.
--- ORIG/trunk/libjava/sysdep/sh/locks.h 2007-01-13 09:53:55.000000000 +0900
+++ trunk/libjava/sysdep/sh/locks.h 2012-06-14 19:18:34.000000000 +0900
@@ -14,45 +14,11 @@ details. */
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