| 1 |
281 |
jeremybenn |
------------------------------------------------------------------------------
|
| 2 |
|
|
-- --
|
| 3 |
|
|
-- GNAT RUN-TIME LIBRARY COMPONENTS --
|
| 4 |
|
|
-- --
|
| 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 _ 1 6 --
|
| 6 |
|
|
-- --
|
| 7 |
|
|
-- B o d y --
|
| 8 |
|
|
-- --
|
| 9 |
|
|
-- Copyright (C) 2002-2009, Free Software Foundation, Inc. --
|
| 10 |
|
|
-- --
|
| 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 3, 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. --
|
| 17 |
|
|
-- --
|
| 18 |
|
|
-- As a special exception under Section 7 of GPL version 3, you are granted --
|
| 19 |
|
|
-- additional permissions described in the GCC Runtime Library Exception, --
|
| 20 |
|
|
-- version 3.1, as published by the Free Software Foundation. --
|
| 21 |
|
|
-- --
|
| 22 |
|
|
-- You should have received a copy of the GNU General Public License and --
|
| 23 |
|
|
-- a copy of the GCC Runtime Library Exception along with this program; --
|
| 24 |
|
|
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
|
| 25 |
|
|
-- <http://www.gnu.org/licenses/>. --
|
| 26 |
|
|
-- --
|
| 27 |
|
|
-- GNAT was originally developed by the GNAT team at New York University. --
|
| 28 |
|
|
-- Extensive contributions were provided by Ada Core Technologies Inc. --
|
| 29 |
|
|
-- --
|
| 30 |
|
|
------------------------------------------------------------------------------
|
| 31 |
|
|
|
| 32 |
|
|
with System.Address_Operations; use System.Address_Operations;
|
| 33 |
|
|
|
| 34 |
|
|
with Ada.Unchecked_Conversion;
|
| 35 |
|
|
|
| 36 |
|
|
package body System.Compare_Array_Unsigned_16 is
|
| 37 |
|
|
|
| 38 |
|
|
type Word is mod 2 ** 32;
|
| 39 |
|
|
-- Used to process operands by words
|
| 40 |
|
|
|
| 41 |
|
|
type Half is mod 2 ** 16;
|
| 42 |
|
|
for Half'Size use 16;
|
| 43 |
|
|
-- Used to process operands by half words
|
| 44 |
|
|
|
| 45 |
|
|
type Uhalf is new Half;
|
| 46 |
|
|
for Uhalf'Alignment use 1;
|
| 47 |
|
|
-- Used to process operands when unaligned
|
| 48 |
|
|
|
| 49 |
|
|
type WP is access Word;
|
| 50 |
|
|
type HP is access Half;
|
| 51 |
|
|
type UP is access Uhalf;
|
| 52 |
|
|
|
| 53 |
|
|
function W is new Ada.Unchecked_Conversion (Address, WP);
|
| 54 |
|
|
function H is new Ada.Unchecked_Conversion (Address, HP);
|
| 55 |
|
|
function U is new Ada.Unchecked_Conversion (Address, UP);
|
| 56 |
|
|
|
| 57 |
|
|
-----------------------
|
| 58 |
|
|
-- Compare_Array_U16 --
|
| 59 |
|
|
-----------------------
|
| 60 |
|
|
|
| 61 |
|
|
function Compare_Array_U16
|
| 62 |
|
|
(Left : System.Address;
|
| 63 |
|
|
Right : System.Address;
|
| 64 |
|
|
Left_Len : Natural;
|
| 65 |
|
|
Right_Len : Natural) return Integer
|
| 66 |
|
|
is
|
| 67 |
|
|
Clen : Natural := Natural'Min (Left_Len, Right_Len);
|
| 68 |
|
|
-- Number of elements left to compare
|
| 69 |
|
|
|
| 70 |
|
|
L : Address := Left;
|
| 71 |
|
|
R : Address := Right;
|
| 72 |
|
|
-- Pointers to next elements to compare
|
| 73 |
|
|
|
| 74 |
|
|
begin
|
| 75 |
|
|
-- Go by words if possible
|
| 76 |
|
|
|
| 77 |
|
|
if ModA (OrA (Left, Right), 4) = 0 then
|
| 78 |
|
|
while Clen > 1
|
| 79 |
|
|
and then W (L).all = W (R).all
|
| 80 |
|
|
loop
|
| 81 |
|
|
Clen := Clen - 2;
|
| 82 |
|
|
L := AddA (L, 4);
|
| 83 |
|
|
R := AddA (R, 4);
|
| 84 |
|
|
end loop;
|
| 85 |
|
|
end if;
|
| 86 |
|
|
|
| 87 |
|
|
-- Case of going by aligned half words
|
| 88 |
|
|
|
| 89 |
|
|
if ModA (OrA (Left, Right), 2) = 0 then
|
| 90 |
|
|
while Clen /= 0 loop
|
| 91 |
|
|
if H (L).all /= H (R).all then
|
| 92 |
|
|
if H (L).all > H (R).all then
|
| 93 |
|
|
return +1;
|
| 94 |
|
|
else
|
| 95 |
|
|
return -1;
|
| 96 |
|
|
end if;
|
| 97 |
|
|
end if;
|
| 98 |
|
|
|
| 99 |
|
|
Clen := Clen - 1;
|
| 100 |
|
|
L := AddA (L, 2);
|
| 101 |
|
|
R := AddA (R, 2);
|
| 102 |
|
|
end loop;
|
| 103 |
|
|
|
| 104 |
|
|
-- Case of going by unaligned half words
|
| 105 |
|
|
|
| 106 |
|
|
else
|
| 107 |
|
|
while Clen /= 0 loop
|
| 108 |
|
|
if U (L).all /= U (R).all then
|
| 109 |
|
|
if U (L).all > U (R).all then
|
| 110 |
|
|
return +1;
|
| 111 |
|
|
else
|
| 112 |
|
|
return -1;
|
| 113 |
|
|
end if;
|
| 114 |
|
|
end if;
|
| 115 |
|
|
|
| 116 |
|
|
Clen := Clen - 1;
|
| 117 |
|
|
L := AddA (L, 2);
|
| 118 |
|
|
R := AddA (R, 2);
|
| 119 |
|
|
end loop;
|
| 120 |
|
|
end if;
|
| 121 |
|
|
|
| 122 |
|
|
-- Here if common section equal, result decided by lengths
|
| 123 |
|
|
|
| 124 |
|
|
if Left_Len = Right_Len then
|
| 125 |
|
|
return 0;
|
| 126 |
|
|
elsif Left_Len > Right_Len then
|
| 127 |
|
|
return +1;
|
| 128 |
|
|
else
|
| 129 |
|
|
return -1;
|
| 130 |
|
|
end if;
|
| 131 |
|
|
end Compare_Array_U16;
|
| 132 |
|
|
|
| 133 |
|
|
end System.Compare_Array_Unsigned_16;
|
