5eb1643c2c
libstdc++-v3/ PR target/29366 * config/cpu/sh/atomicity.h (__exchange_and_add, __atomic_add): Remove SH4A inline asm and lock based implementations and use the defaults from ext/atomicity.h. From-SVN: r220094
36 lines
1.7 KiB
C++
36 lines
1.7 KiB
C++
// Low-level functions for atomic operations: sh version -*- C++ -*-
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// Copyright (C) 1999-2015 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for 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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// Use the default atomicity stuff, which will use __atomic* builtins
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// if threads are available, or the *_single functions on single-thread
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// configurations.
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// Actually we wouldn't need this header at all, but because of PR 53579
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// libstdc++'s configury will not pickup the -matomic-model= option when
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// set in the environment. This makes it impossible to enable the proper
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// atomic model on SH without modifying GCC itself, because libstdc++ always
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// thinks the target doesn't do any atomics and uses the default mutex based
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// implementation from cpu/generic/atomicity/mutex.
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#include <ext/atomicity.h>
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