9056d0df83
This is a follow-up to commit a4c6bd0821
introducing a runtime check for alignment for 16 byte atomic
compare-exchange, load, and store.
libatomic/ChangeLog:
* config/s390/cas_n.c: New file.
* config/s390/load_n.c: New file.
* config/s390/store_n.c: New file.
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* Copyright (C) 2018-2023 Free Software Foundation, Inc.
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This file is part of the GNU Atomic Library (libatomic).
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Libatomic is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <libatomic_i.h>
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/* Analog to config/s390/exch_n.c. */
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#if !DONE && N == 16
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bool
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SIZE(libat_compare_exchange) (UTYPE *mptr, UTYPE *eptr, UTYPE newval,
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int smodel, int fmodel UNUSED)
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{
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if (!((uintptr_t)mptr & 0xf))
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{
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return __atomic_compare_exchange_n (
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(UTYPE *)__builtin_assume_aligned (mptr, 16), eptr, newval, false,
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__ATOMIC_SEQ_CST, __ATOMIC_RELAXED);
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}
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else
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{
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UTYPE oldval;
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UWORD magic;
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bool ret;
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pre_seq_barrier (smodel);
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magic = protect_start (mptr);
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oldval = *mptr;
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ret = (oldval == *eptr);
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if (ret)
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*mptr = newval;
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else
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*eptr = oldval;
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protect_end (mptr, magic);
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post_seq_barrier (smodel);
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return ret;
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}
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}
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#define DONE 1
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#endif /* N == 16 */
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#include "../../cas_n.c"
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