1 files changed, 76 insertions, 0 deletions
diff --git a/contrib/libstdc++/config/cpu/alpha/atomicity.h b/contrib/libstdc++/config/cpu/alpha/atomicity.h
new file mode 100644
index 0000000..895d87a
--- /dev/null
+++ b/contrib/libstdc++/config/cpu/alpha/atomicity.h
@@ -0,0 +1,76 @@
+// Low-level functions for atomic operations: Alpha version  -*- C++ -*-
+
+// Copyright (C) 1999, 2000, 2001 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 2, 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#ifndef _BITS_ATOMICITY_H
+#define _BITS_ATOMICITY_H	1
+
+/* @@@ With gas we can play nice .subsection games to get the
+   non-predicted branch pointing forward.  But Digital assemblers
+   don't understand those directives.  This isn't a terribly
+   important issue, so just ignore it.  */
+
+typedef int _Atomic_word;
+
+static inline _Atomic_word
+__attribute__ ((__unused__))
+__exchange_and_add (volatile _Atomic_word* __mem, int __val)
+{
+  register int __result, __tmp;
+
+  __asm__ __volatile__ (
+      "\n$Lxadd_%=:\n\t"
+      "ldl_l  %0,%3\n\t"
+      "addl   %0,%4,%1\n\t"
+      "stl_c  %1,%2\n\t"
+      "beq    %1,$Lxadd_%=\n\t"
+      "mb"
+      : "=&r"(__result), "=&r"(__tmp), "=m"(*__mem)
+      : "m" (*__mem), "r"(__val));
+
+  return __result;
+}
+
+static inline void
+__attribute__ ((__unused__))
+__atomic_add (volatile _Atomic_word* __mem, int __val)
+{
+  register _Atomic_word __result;
+
+  __asm__ __volatile__ (
+      "\n$Ladd_%=:\n\t"
+      "ldl_l  %0,%2\n\t"
+      "addl   %0,%3,%0\n\t"
+      "stl_c  %0,%1\n\t"
+      "beq    %0,$Ladd_%=\n\t"
+      "mb"
+      : "=&r"(__result), "=m"(*__mem)
+      : "m" (*__mem), "r"(__val));
+}
+
+#endif /* atomicity.h */