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diff --git a/libstdc++-v3/config/cpu/i486/atomicity.h b/libstdc++-v3/config/cpu/i486/atomicity.h
new file mode 100644
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+++ b/libstdc++-v3/config/cpu/i486/atomicity.h
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+// Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*-
+
+// Copyright (C) 1999, 2000, 2001, 2004, 2005, 2009 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
+// .
+
+#include
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+ _Atomic_word
+ __attribute__ ((__unused__))
+ __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+ {
+ 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)
+ {
+ __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}"
+ : "=m" (*__mem) : "ir" (__val), "m" (*__mem));
+ }
+
+_GLIBCXX_END_NAMESPACE
+