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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-atocou-x86.adb] - Blame information for rev 706

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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--               S Y S T E M . A T O M I C _ C O U N T E R S                --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--                       Copyright (C) 2011, AdaCore                        --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This implementation of the package for x86 processor. GCC can't generate
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--  code for atomic builtins for 386 CPU. Only increment/decrement instructions
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--  are supported, thus this implementaton uses machine code insertions to
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--  access the necessary instructions.
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with System.Machine_Code;
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package body System.Atomic_Counters is
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   --  Add comments showing in normal asm language what we generate???
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   ---------------
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   -- Decrement --
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   ---------------
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   function Decrement (Item : in out Atomic_Counter) return Boolean is
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      Aux : Boolean;
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   begin
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      System.Machine_Code.Asm
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        (Template =>
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           "lock%; decl" & ASCII.HT & "%0" & ASCII.LF & ASCII.HT
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             & "sete %1",
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         Outputs  =>
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           (Unsigned_32'Asm_Output ("=m", Item.Value),
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            Boolean'Asm_Output ("=qm", Aux)),
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         Inputs   => Unsigned_32'Asm_Input ("m", Item.Value),
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         Volatile => True);
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      return Aux;
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   end Decrement;
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   ---------------
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   -- Increment --
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   ---------------
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   procedure Increment (Item : in out Atomic_Counter) is
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   begin
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      System.Machine_Code.Asm
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        (Template => "lock%; incl" & ASCII.HT & "%0",
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         Outputs  => Unsigned_32'Asm_Output ("=m", Item.Value),
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         Inputs   => Unsigned_32'Asm_Input ("m", Item.Value),
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         Volatile => True);
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   end Increment;
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   ------------
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   -- Is_One --
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   ------------
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   function Is_One (Item : Atomic_Counter) return Boolean is
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   begin
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      return Item.Value = 1;
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   end Is_One;
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end System.Atomic_Counters;

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