Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-casi64.adb @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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68:561a7518be6b | 111:04ced10e8804 |
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1 ------------------------------------------------------------------------------ | |
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 _ S I G N E D _ 6 4 -- | |
6 -- -- | |
7 -- B o d y -- | |
8 -- -- | |
9 -- Copyright (C) 2002-2017, 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_Signed_64 is | |
37 | |
38 type Word is range -2**63 .. 2**63 - 1; | |
39 for Word'Size use 64; | |
40 -- Used to process operands by words | |
41 | |
42 type Uword is new Word; | |
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 | |
49 function W is new Ada.Unchecked_Conversion (Address, WP); | |
50 function U is new Ada.Unchecked_Conversion (Address, UP); | |
51 | |
52 ----------------------- | |
53 -- Compare_Array_S64 -- | |
54 ----------------------- | |
55 | |
56 function Compare_Array_S64 | |
57 (Left : System.Address; | |
58 Right : System.Address; | |
59 Left_Len : Natural; | |
60 Right_Len : Natural) return Integer | |
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 double words | |
71 | |
72 if ModA (OrA (Left, Right), 8) = 0 then | |
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; | |
83 L := AddA (L, 8); | |
84 R := AddA (R, 8); | |
85 end loop; | |
86 | |
87 -- Case of going by unaligned double words | |
88 | |
89 else | |
90 while Clen /= 0 loop | |
91 if U (L).all /= U (R).all then | |
92 if U (L).all > U (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, 8); | |
101 R := AddA (R, 8); | |
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_S64; | |
115 | |
116 end System.Compare_Array_Signed_64; |