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Diffstat (limited to 'contrib/libstdc++/config/cpu/alpha/atomicity.h')
-rw-r--r-- | contrib/libstdc++/config/cpu/alpha/atomicity.h | 76 |
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 */ |