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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: karatsuba.h,v 1.3 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * Macros for Karatsuba functions |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | #ifndef CATACOMB_KARATSUBA_H |
31 | #define CATACOMB_KARATSUBA_H |
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32 | |
33 | #ifdef __cplusplus |
34 | extern "C" { |
35 | #endif |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #ifndef CATACOMB_MPW_H |
40 | # include "mpw.h" |
41 | #endif |
42 | |
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43 | /*----- Normal arithmetic macros ------------------------------------------*/ |
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44 | |
45 | #define UADD(dv, av, avl) do { \ |
46 | mpw *_dv = (dv); \ |
47 | const mpw *_av = (av), *_avl = (avl); \ |
48 | mpw _c = 0; \ |
49 | \ |
50 | while (_av < _avl) { \ |
51 | mpw _a, _b; \ |
52 | mpd _x; \ |
53 | _a = *_av++; \ |
54 | _b = *_dv; \ |
55 | _x = (mpd)_a + (mpd)_b + _c; \ |
56 | *_dv++ = MPW(_x); \ |
57 | _c = _x >> MPW_BITS; \ |
58 | } \ |
59 | while (_c) { \ |
60 | mpd _x = (mpd)*_dv + (mpd)_c; \ |
61 | *_dv++ = MPW(_x); \ |
62 | _c = _x >> MPW_BITS; \ |
63 | } \ |
64 | } while (0) |
65 | |
66 | #define UADD2(dv, dvl, av, avl, bv, bvl) do { \ |
67 | mpw *_dv = (dv), *_dvl = (dvl); \ |
68 | const mpw *_av = (av), *_avl = (avl); \ |
69 | const mpw *_bv = (bv), *_bvl = (bvl); \ |
70 | mpw _c = 0; \ |
71 | \ |
72 | while (_av < _avl || _bv < _bvl) { \ |
73 | mpw _a, _b; \ |
74 | mpd _x; \ |
75 | _a = (_av < _avl) ? *_av++ : 0; \ |
76 | _b = (_bv < _bvl) ? *_bv++ : 0; \ |
77 | _x = (mpd)_a + (mpd)_b + _c; \ |
78 | *_dv++ = MPW(_x); \ |
79 | _c = _x >> MPW_BITS; \ |
80 | } \ |
81 | *_dv++ = _c; \ |
82 | while (_dv < _dvl) \ |
83 | *_dv++ = 0; \ |
84 | } while (0) |
85 | |
86 | #define USUB(dv, av, avl) do { \ |
87 | mpw *_dv = (dv); \ |
88 | const mpw *_av = (av), *_avl = (avl); \ |
89 | mpw _c = 0; \ |
90 | \ |
91 | while (_av < _avl) { \ |
92 | mpw _a, _b; \ |
93 | mpd _x; \ |
94 | _a = *_av++; \ |
95 | _b = *_dv; \ |
96 | _x = (mpd)_b - (mpd)_a - _c; \ |
97 | *_dv++ = MPW(_x); \ |
98 | if (_x >> MPW_BITS) \ |
99 | _c = 1; \ |
100 | else \ |
101 | _c = 0; \ |
102 | } \ |
103 | while (_c) { \ |
104 | mpd _x = (mpd)*_dv - (mpd)_c; \ |
105 | *_dv++ = MPW(_x); \ |
106 | if (_x >> MPW_BITS) \ |
107 | _c = 1; \ |
108 | else \ |
109 | _c = 0; \ |
110 | } \ |
111 | } while (0) |
112 | |
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113 | /*----- Binary polynomial arithmetic macros -------------------------------*/ |
114 | |
115 | #define UXOR(dv, av, avl) do { \ |
116 | mpw *_dv = (dv); \ |
117 | const mpw *_av = (av), *_avl = (avl); \ |
118 | \ |
119 | while (_av < _avl) \ |
120 | *_dv++ ^= *_av++; \ |
121 | } while (0) |
122 | |
123 | #define UXOR2(dv, dvl, av, avl, bv, bvl) do { \ |
124 | mpw *_dv = (dv), *_dvl = (dvl); \ |
125 | const mpw *_av = (av), *_avl = (avl); \ |
126 | const mpw *_bv = (bv), *_bvl = (bvl); \ |
127 | \ |
128 | while (_av < _avl || _bv < _bvl) { \ |
129 | mpw _a, _b; \ |
130 | _a = (_av < _avl) ? *_av++ : 0; \ |
131 | _b = (_bv < _bvl) ? *_bv++ : 0; \ |
132 | *_dv++ = _a ^ _b; \ |
133 | } \ |
134 | while (_dv < _dvl) \ |
135 | *_dv++ = 0; \ |
136 | } while (0) |
137 | |
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138 | /*----- That's all, folks -------------------------------------------------*/ |
139 | |
140 | #ifdef __cplusplus |
141 | } |
142 | #endif |
143 | |
144 | #endif |