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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [s-casi32.adb] - Blame information for rev 320

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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                    GNAT RUN-TIME LIBRARY COMPONENTS                      --
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--                                                                          --
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--        S Y S T E M . C O M P A R E _ A R R A Y _ S I G N E D _ 3 2       --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--          Copyright (C) 2002-2009, Free Software Foundation, Inc.         --
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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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with System.Address_Operations; use System.Address_Operations;
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with Ada.Unchecked_Conversion;
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package body System.Compare_Array_Signed_32 is
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   type Word is range -2**31 .. 2**31 - 1;
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   for Word'Size use 32;
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   --  Used to process operands by words
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   type Uword is new Word;
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   for Uword'Alignment use 1;
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   --  Used to process operands when unaligned
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   type WP is access Word;
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   type UP is access Uword;
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   function W is new Ada.Unchecked_Conversion (Address, WP);
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   function U is new Ada.Unchecked_Conversion (Address, UP);
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   -----------------------
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   -- Compare_Array_S32 --
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   -----------------------
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   function Compare_Array_S32
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     (Left      : System.Address;
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      Right     : System.Address;
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      Left_Len  : Natural;
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      Right_Len : Natural) return Integer
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   is
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      Clen : Natural := Natural'Min (Left_Len, Right_Len);
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      --  Number of elements left to compare
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      L : Address := Left;
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      R : Address := Right;
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      --  Pointers to next elements to compare
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   begin
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      --  Case of going by aligned words
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      if ModA (OrA (Left, Right), 4) = 0 then
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         while Clen /= 0 loop
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            if W (L).all /= W (R).all then
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               if W (L).all > W (R).all then
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                  return +1;
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               else
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                  return -1;
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               end if;
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            end if;
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            Clen := Clen - 1;
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            L := AddA (L, 4);
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            R := AddA (R, 4);
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         end loop;
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      --  Case of going by unaligned words
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      else
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         while Clen /= 0 loop
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            if U (L).all /= U (R).all then
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               if U (L).all > U (R).all then
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                  return +1;
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               else
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                  return -1;
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               end if;
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            end if;
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            Clen := Clen - 1;
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            L := AddA (L, 4);
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            R := AddA (R, 4);
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         end loop;
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      end if;
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      --  Here if common section equal, result decided by lengths
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      if Left_Len = Right_Len then
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         return 0;
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      elsif Left_Len > Right_Len then
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         return +1;
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      else
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         return -1;
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      end if;
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   end Compare_Array_S32;
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end System.Compare_Array_Signed_32;

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