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 _ S I G N E D _ 6 4 --
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 System.Address_Operations; use System.Address_Operations;
36 with Unchecked_Conversion;
38 package body System.Compare_Array_Signed_64 is
40 type Word is range -2**63 .. 2**63 - 1;
42 -- Used to process operands by words
48 for Uword'Alignment use 1;
49 -- Used to process operands when unaligned
51 type WP is access Word;
52 type UP is access Uword;
54 function W is new Unchecked_Conversion (Address, WP);
55 function U is new Unchecked_Conversion (Address, UP);
57 -----------------------
58 -- Compare_Array_S64 --
59 -----------------------
61 function Compare_Array_S64
62 (Left : System.Address;
63 Right : System.Address;
65 Right_Len : Natural) return Integer
67 Clen : Natural := Natural'Min (Left_Len, Right_Len);
68 -- Number of elements left to compare
72 -- Pointers to next elements to compare
75 -- Case of going by aligned double words
77 if ModA (OrA (Left, Right), 8) = 0 then
79 if W (L).all /= W (R).all then
80 if W (L).all > W (R).all then
92 -- Case of going by unaligned double words
96 if U (L).W /= U (R).W then
97 if U (L).W > U (R).W then
110 -- Here if common section equal, result decided by lengths
112 if Left_Len = Right_Len then
114 elsif Left_Len > Right_Len then
119 end Compare_Array_S64;
121 end System.Compare_Array_Signed_64;