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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME LIBRARY COMPONENTS --
--- --
--- S Y S T E M . C O M P A R E _ A R R A Y _ U N S I G N E D _ 3 2 --
--- --
--- B o d y --
--- --
--- Copyright (C) 2002-2005 Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT 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 distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit 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 Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-with System.Address_Operations; use System.Address_Operations;
-
-with Unchecked_Conversion;
-
-package body System.Compare_Array_Unsigned_32 is
-
- type Word is mod 2 ** 32;
- for Word'Size use 32;
- -- Used to process operands by words
-
- type Uword is record
- W : Word;
- end record;
- pragma Pack (Uword);
- for Uword'Alignment use 1;
- -- Used to process operands when unaligned
-
- type WP is access Word;
- type UP is access Uword;
-
- function W is new Unchecked_Conversion (Address, WP);
- function U is new Unchecked_Conversion (Address, UP);
-
- -----------------------
- -- Compare_Array_U32 --
- -----------------------
-
- function Compare_Array_U32
- (Left : System.Address;
- Right : System.Address;
- Left_Len : Natural;
- Right_Len : Natural) return Integer
- is
- Clen : Natural := Natural'Min (Left_Len, Right_Len);
- -- Number of elements left to compare
-
- L : Address := Left;
- R : Address := Right;
- -- Pointers to next elements to compare
-
- begin
- -- Case of going by aligned words
-
- if ModA (OrA (Left, Right), 4) = 0 then
- while Clen /= 0 loop
- if W (L).all /= W (R).all then
- if W (L).all > W (R).all then
- return +1;
- else
- return -1;
- end if;
- end if;
-
- Clen := Clen - 1;
- L := AddA (L, 4);
- R := AddA (R, 4);
- end loop;
-
- -- Case of going by unaligned words
-
- else
- while Clen /= 0 loop
- if U (L).W /= U (R).W then
- if U (L).W > U (R).W then
- return +1;
- else
- return -1;
- end if;
- end if;
-
- Clen := Clen - 1;
- L := AddA (L, 4);
- R := AddA (R, 4);
- end loop;
- end if;
-
- -- Here if common section equal, result decided by lengths
-
- if Left_Len = Right_Len then
- return 0;
- elsif Left_Len > Right_Len then
- return +1;
- else
- return -1;
- end if;
- end Compare_Array_U32;
-
-end System.Compare_Array_Unsigned_32;