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/*
* 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()
{
__asm__ __volatile__("mb" : : : "memory");
}
#define AO_HAVE_nop_full
AO_INLINE void
AO_nop_write()
{
__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 was_equal;
}
#define AO_HAVE_compare_and_swap
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