--- /dev/null
+/*
+ * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
+ * Copyright (c) 1999-2003 by Hewlett-Packard Company. All rights reserved.
+ *
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ */
+
+#include "../atomic_load_store.h"
+
+#include "../test_and_set_t_is_ao_t.h"
+
+#define AO_NO_DD_ORDERING
+ /* Data dependence does not imply read ordering. */
+
+AO_INLINE void
+AO_nop_full(void)
+{
+ __asm__ __volatile__("mb" : : : "memory");
+}
+#define AO_HAVE_nop_full
+
+AO_INLINE void
+AO_nop_write(void)
+{
+ __asm__ __volatile__("wmb" : : : "memory");
+}
+#define AO_HAVE_nop_write
+
+/* mb should be used for AO_nop_read(). That's the default. */
+
+/* We believe that ldq_l ... stq_c does not imply any memory barrier. */
+/* We should add an explicit fetch_and_add definition. */
+AO_INLINE int
+AO_compare_and_swap(volatile AO_t *addr,
+ AO_t old, AO_t new_val)
+{
+ unsigned long was_equal;
+ unsigned long temp;
+
+ __asm__ __volatile__(
+ "1: ldq_l %0,%1\n"
+ " cmpeq %0,%4,%2\n"
+ " mov %3,%0\n"
+ " beq %2,2f\n"
+ " stq_c %0,%1\n"
+ " beq %0,1b\n"
+ "2:\n"
+ :"=&r" (temp), "=m" (*addr), "=&r" (was_equal)
+ : "r" (new_val), "Ir" (old)
+ :"memory");
+ return (int)was_equal;
+}
+#define AO_HAVE_compare_and_swap