From 95b02d7e3aa3830b46325a8c6b090d3ae682e3ea Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl@gcc.gnu.org>
Date: Wed, 25 Jul 2001 22:04:48 -0700
Subject: [PATCH] configure.target (cpu_include_dir): Set to `config/cpu/mips'
 for mips.

2001-07-25  H.J. Lu <hjl@gnu.org>

	* configure.target (cpu_include_dir): Set to `config/cpu/mips'
	for mips.

	* config/cpu/mips/bits/atomicity.h: New.

[[Split portion of a mixed commit.]]

From-SVN: r44374.2
---
 libstdc++-v3/config/cpu/mips/bits/atomicity.h | 138 ++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 libstdc++-v3/config/cpu/mips/bits/atomicity.h

diff --git a/libstdc++-v3/config/cpu/mips/bits/atomicity.h b/libstdc++-v3/config/cpu/mips/bits/atomicity.h
new file mode 100644
index 00000000000..d3e7743ef7b
--- /dev/null
+++ b/libstdc++-v3/config/cpu/mips/bits/atomicity.h
@@ -0,0 +1,138 @@
+// Low-level functions for atomic operations. Mips version.
+
+// Copyright (C) 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
+
+#include <sgidefs.h>
+
+typedef int _Atomic_word;
+
+#if (_MIPS_ISA >= _MIPS_ISA_MIPS2)
+
+static inline int
+__attribute__ ((unused))
+__exchange_and_add (volatile _Atomic_word *__mem, int __val)
+{
+  int __result, __tmp;
+
+  __asm__ __volatile__
+    ("/* Inline exchange & add */\n\t"
+     "1:\n\t"
+     "ll	%0,%3\n\t"
+     "addu	%1,%4,%0\n\t"
+     "sc	%1,%2\n\t"
+     "beqz	%1,1b\n\t"
+     "/* End exchange & add */"
+     : "=&r"(__result), "=&r"(__tmp), "=m"(*__mem)
+     : "m" (*__mem), "r"(__val)
+     : "memory");
+
+  return __result;
+}
+
+static inline void
+__attribute__ ((unused))
+__atomic_add (volatile _Atomic_word *__mem, int __val)
+{
+  int __result;
+
+  __asm__ __volatile__
+    ("/* Inline atomic add */\n\t"
+     "1:\n\t"
+     "ll	%0,%2\n\t"
+     "addu	%0,%3,%0\n\t"
+     "sc	%0,%1\n\t"
+     "beqz	%0,1b\n\t"
+     "/* End atomic add */"
+     : "=&r"(__result), "=m"(*__mem)
+     : "m" (*__mem), "r"(__val)
+     : "memory");
+}
+
+static inline int
+__attribute__ ((unused))
+__compare_and_swap (volatile long int *__p, long int __oldval,
+		    long int __newval)
+{
+  long int __ret;
+
+  __asm__ __volatile__
+    ("/* Inline compare & swap */\n\t"
+     "1:\n\t"
+     "ll	%0,%4\n\t"
+     ".set	push\n"
+     ".set	noreorder\n\t"
+     "bne	%0,%2,2f\n\t"
+     "move	%0,%3\n\t"
+     ".set	pop\n\t"
+     "sc	%0,%1\n\t"
+     "beqz	%0,1b\n"
+     "2:\n\t"
+     "/* End compare & swap */"
+     : "=&r" (__ret), "=m" (*__p)
+     : "r" (__oldval), "r" (__newval), "m" (*__p)
+     : "memory");
+
+  return __ret;
+}
+
+#else /* (_MIPS_ISA >= _MIPS_ISA_MIPS2) */
+
+static inline int
+__attribute__ ((unused))
+__exchange_and_add (volatile _Atomic_word *__mem, int __val)
+{
+  int __result = *__mem;
+  *__mem += __val;
+  return __result;
+}
+
+static inline void
+__attribute__ ((unused))
+__atomic_add (volatile _Atomic_word *__mem, int __val)
+{
+  *__mem += __val;
+}
+
+static inline int
+__attribute__ ((unused))
+__compare_and_swap (volatile long int *__p, long int __oldval,
+		    long int __newval)
+{
+  if (*__p != __oldval)
+    return 0;
+
+  *__p = __newval;
+  return 1;
+}
+
+#endif /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
+
+#endif /* atomicity.h */