1 ------------------------------------------------------------------------------
3 -- GNU ADA RUNTIME LIBRARY COMPONENTS --
5 -- 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 --
9 -- Copyright (C) 2002-2004 Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 with Unchecked_Conversion;
36 package body System.Compare_Array_Unsigned_32 is
38 function "+" (Left, Right : Address) return Address;
39 pragma Import (Intrinsic, "+");
40 -- Provide addition operation on type Address (this may not be directly
41 -- available if type System.Address is non-private and the operations on
42 -- the type are made abstract to hide them from public users of System.
44 type Word is mod 2 ** 32;
46 -- Used to process operands by words
52 for Uword'Alignment use 1;
53 -- Used to process operands when unaligned
55 type WP is access Word;
56 type UP is access Uword;
58 function W is new Unchecked_Conversion (Address, WP);
59 function U is new Unchecked_Conversion (Address, UP);
61 -----------------------
62 -- Compare_Array_U32 --
63 -----------------------
65 function Compare_Array_U32
66 (Left : System.Address;
67 Right : System.Address;
72 Clen : Natural := Natural'Min (Left_Len, Right_Len);
73 -- Number of elements left to compare
77 -- Pointers to next elements to compare
80 -- Case of going by aligned words
82 if ((Left or Right) and (4 - 1)) = 0 then
84 if W (L).all /= W (R).all then
85 if W (L).all > W (R).all then
97 -- Case of going by unaligned words
101 if U (L).W /= U (R).W then
102 if U (L).W > U (R).W then
115 -- Here if common section equal, result decided by lengths
117 if Left_Len = Right_Len then
119 elsif Left_Len > Right_Len then
124 end Compare_Array_U32;
126 end System.Compare_Array_Unsigned_32;