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aix: delete AIX pre-PowerPC version of atomicity.h

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The AIX-specific version of atomicity.h that provides compatibility
for the origina POWER architecture without atomic instructions no longer
is referenced.  This patch deletes the file.

libstdc++-v3/ChangeLog:

	* config/os/aix/atomicity.h: Delete.
This commit is contained in:
David Edelsohn 2021-04-22 14:52:22 -04:00
parent 4e1aaf32dd
commit b5f79f4d38
1 changed files with 0 additions and 56 deletions
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56
libstdc++-v3/config/os/aix/atomicity.h
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@ -1,56 +0,0 @@
// Low-level functions for atomic operations: AIX version -*- C++ -*-
// Copyright (C) 2000-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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, or (at your option)
// any later version.
// This library 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 <ext/atomicity.h>
/* We cannot use the cpu/powerpc/bits/atomicity.h inline assembly
definitions for these operations since they depend on operations
that are not available on the original POWER architecture. AIX
still runs on the POWER architecture, so it would be incorrect to
assume the existence of these instructions.
The definition of _Atomic_word must match the type pointed to by
atomic_p in <sys/atomic_op.h>. */
extern "C"
{
#include <sys/atomic_op.h>
}
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
_Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word* __mem, int __val) throw ()
{ return ::fetch_and_add(const_cast<atomic_p>(__mem), __val); }
void
__attribute__ ((__unused__))
__atomic_add (volatile _Atomic_word* __mem, int __val) throw ()
{ (void) ::fetch_and_add(const_cast<atomic_p>(__mem), __val); }
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace