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1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3084fecd | 3 | -- GNAT RUN-TIME LIBRARY COMPONENTS -- |
fbf5a39b AC |
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 _ 3 2 -- | |
6 | -- -- | |
7 | -- B o d y -- | |
8 | -- -- | |
4b490c1e | 9 | -- Copyright (C) 2002-2020, Free Software Foundation, Inc. -- |
fbf5a39b AC |
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- -- | |
748086b7 | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
fbf5a39b AC |
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 -- | |
748086b7 JJ |
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/>. -- | |
fbf5a39b AC |
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 | ||
cc4f0de1 AC |
32 | with System.Address_Operations; use System.Address_Operations; |
33 | ||
cecaf88a | 34 | with Ada.Unchecked_Conversion; |
fbf5a39b AC |
35 | |
36 | package body System.Compare_Array_Unsigned_32 is | |
37 | ||
38 | type Word is mod 2 ** 32; | |
39 | for Word'Size use 32; | |
40 | -- Used to process operands by words | |
41 | ||
6054bf2a | 42 | type Uword is new Word; |
fbf5a39b AC |
43 | for Uword'Alignment use 1; |
44 | -- Used to process operands when unaligned | |
45 | ||
46 | type WP is access Word; | |
47 | type UP is access Uword; | |
48 | ||
cecaf88a RD |
49 | function W is new Ada.Unchecked_Conversion (Address, WP); |
50 | function U is new Ada.Unchecked_Conversion (Address, UP); | |
fbf5a39b AC |
51 | |
52 | ----------------------- | |
53 | -- Compare_Array_U32 -- | |
54 | ----------------------- | |
55 | ||
56 | function Compare_Array_U32 | |
57 | (Left : System.Address; | |
58 | Right : System.Address; | |
59 | Left_Len : Natural; | |
cc4f0de1 | 60 | Right_Len : Natural) return Integer |
fbf5a39b AC |
61 | is |
62 | Clen : Natural := Natural'Min (Left_Len, Right_Len); | |
63 | -- Number of elements left to compare | |
64 | ||
65 | L : Address := Left; | |
66 | R : Address := Right; | |
67 | -- Pointers to next elements to compare | |
68 | ||
69 | begin | |
70 | -- Case of going by aligned words | |
71 | ||
cc4f0de1 | 72 | if ModA (OrA (Left, Right), 4) = 0 then |
fbf5a39b AC |
73 | while Clen /= 0 loop |
74 | if W (L).all /= W (R).all then | |
75 | if W (L).all > W (R).all then | |
76 | return +1; | |
77 | else | |
78 | return -1; | |
79 | end if; | |
80 | end if; | |
81 | ||
82 | Clen := Clen - 1; | |
cc4f0de1 AC |
83 | L := AddA (L, 4); |
84 | R := AddA (R, 4); | |
fbf5a39b AC |
85 | end loop; |
86 | ||
87 | -- Case of going by unaligned words | |
88 | ||
89 | else | |
90 | while Clen /= 0 loop | |
6054bf2a EB |
91 | if U (L).all /= U (R).all then |
92 | if U (L).all > U (R).all then | |
fbf5a39b AC |
93 | return +1; |
94 | else | |
95 | return -1; | |
96 | end if; | |
97 | end if; | |
98 | ||
99 | Clen := Clen - 1; | |
cc4f0de1 AC |
100 | L := AddA (L, 4); |
101 | R := AddA (R, 4); | |
fbf5a39b AC |
102 | end loop; |
103 | end if; | |
104 | ||
105 | -- Here if common section equal, result decided by lengths | |
106 | ||
107 | if Left_Len = Right_Len then | |
108 | return 0; | |
109 | elsif Left_Len > Right_Len then | |
110 | return +1; | |
111 | else | |
112 | return -1; | |
113 | end if; | |
114 | end Compare_Array_U32; | |
115 | ||
116 | end System.Compare_Array_Unsigned_32; |