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/* Copyright (C) 2018-2023 Free Software Foundation, Inc.
This file is part of the GNU Atomic Library (libatomic).
Libatomic is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include <libatomic_i.h>
/* Analog to config/s390/exch_n.c. */
#if !DONE && N == 16
bool
SIZE(libat_compare_exchange) (UTYPE *mptr, UTYPE *eptr, UTYPE newval,
int smodel, int fmodel UNUSED)
{
if (!((uintptr_t)mptr & 0xf))
{
return __atomic_compare_exchange_n (
(UTYPE *)__builtin_assume_aligned (mptr, 16), eptr, newval, false,
__ATOMIC_SEQ_CST, __ATOMIC_RELAXED);
}
else
{
UTYPE oldval;
UWORD magic;
bool ret;
pre_seq_barrier (smodel);
magic = protect_start (mptr);
oldval = *mptr;
ret = (oldval == *eptr);
if (ret)
*mptr = newval;
else
*eptr = oldval;
protect_end (mptr, magic);
post_seq_barrier (smodel);
return ret;
}
}
#define DONE 1
#endif /* N == 16 */
#include "../../cas_n.c"
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