libstdc++: Remove unused config/cpu/i486/atomicity.h file

This file is no longer used, because we always use the definitions in
config/cpu/generic/atomicity_builtins/atomicity.h now.

libstdc++-v3/ChangeLog:

	* config/cpu/i486/atomicity.h: Removed.

Reviewed-by: Uros Bizjak <ubizjak@gmail.com>

diff --git a/libstdc++-v3/config/cpu/i486/atomicity.h b/libstdc++-v3/config/cpu/i486/atomicity.h
deleted file mode 100644 (file)
index 092ea9d..0000000
--- a/libstdc++-v3/config/cpu/i486/atomicity.h
+++ /dev/null
@@ -1,52 +0,0 @@
-// Low-level functions for atomic operations: x86, x >= 4 version  -*- C++ -*-
-
-// Copyright (C) 1999-2025 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>
-
-namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
-{
-_GLIBCXX_BEGIN_NAMESPACE_VERSION
-
-  _Atomic_word
-  __attribute__ ((__unused__))
-  __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
-  {
-    register _Atomic_word __result;
-    __asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}"
-                         : "=r" (__result), "=m" (*__mem)
-                         : "0" (__val), "m" (*__mem));
-    return __result;
-  }
-
-  void
-  __attribute__ ((__unused__))
-  __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
-  {
-    __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}"
-                         : "=m" (*__mem) : "ir" (__val), "m" (*__mem));
-  }
-
-_GLIBCXX_END_NAMESPACE_VERSION
-} // namespace
-