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3ce9d0d4 LL |
1 | /* uint64_t-like operations that work even on hosts lacking uint64_t |
2 | ||
ab422c4d | 3 | Copyright (C) 2006, 2009-2013 Free Software Foundation, Inc. |
3ce9d0d4 LL |
4 | |
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation, either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | /* Written by Paul Eggert. */ | |
19 | ||
20 | #include <stdint.h> | |
21 | ||
230fe2a5 PE |
22 | #ifndef _GL_INLINE_HEADER_BEGIN |
23 | #error "Please include config.h first." | |
24 | #endif | |
a0d4efe9 PE |
25 | _GL_INLINE_HEADER_BEGIN |
26 | #ifndef _GL_U64_INLINE | |
27 | # define _GL_U64_INLINE _GL_INLINE | |
28 | #endif | |
29 | ||
3ce9d0d4 LL |
30 | /* Return X rotated left by N bits, where 0 < N < 64. */ |
31 | #define u64rol(x, n) u64or (u64shl (x, n), u64shr (x, 64 - n)) | |
32 | ||
33 | #ifdef UINT64_MAX | |
34 | ||
35 | /* Native implementations are trivial. See below for comments on what | |
36 | these operations do. */ | |
37 | typedef uint64_t u64; | |
38 | # define u64hilo(hi, lo) ((u64) (((u64) (hi) << 32) + (lo))) | |
39 | # define u64init(hi, lo) u64hilo (hi, lo) | |
40 | # define u64lo(x) ((u64) (x)) | |
caf8a9b2 | 41 | # define u64size(x) u64lo (x) |
3ce9d0d4 LL |
42 | # define u64lt(x, y) ((x) < (y)) |
43 | # define u64and(x, y) ((x) & (y)) | |
44 | # define u64or(x, y) ((x) | (y)) | |
45 | # define u64xor(x, y) ((x) ^ (y)) | |
46 | # define u64plus(x, y) ((x) + (y)) | |
47 | # define u64shl(x, n) ((x) << (n)) | |
48 | # define u64shr(x, n) ((x) >> (n)) | |
49 | ||
50 | #else | |
51 | ||
52 | /* u64 is a 64-bit unsigned integer value. | |
53 | u64init (HI, LO), is like u64hilo (HI, LO), but for use in | |
54 | initializer contexts. */ | |
55 | # ifdef WORDS_BIGENDIAN | |
56 | typedef struct { uint32_t hi, lo; } u64; | |
57 | # define u64init(hi, lo) { hi, lo } | |
58 | # else | |
59 | typedef struct { uint32_t lo, hi; } u64; | |
60 | # define u64init(hi, lo) { lo, hi } | |
61 | # endif | |
62 | ||
63 | /* Given the high and low-order 32-bit quantities HI and LO, return a u64 | |
64 | value representing (HI << 32) + LO. */ | |
a0d4efe9 | 65 | _GL_U64_INLINE u64 |
3ce9d0d4 LL |
66 | u64hilo (uint32_t hi, uint32_t lo) |
67 | { | |
68 | u64 r; | |
69 | r.hi = hi; | |
70 | r.lo = lo; | |
71 | return r; | |
72 | } | |
73 | ||
74 | /* Return a u64 value representing LO. */ | |
a0d4efe9 | 75 | _GL_U64_INLINE u64 |
3ce9d0d4 LL |
76 | u64lo (uint32_t lo) |
77 | { | |
78 | u64 r; | |
79 | r.hi = 0; | |
80 | r.lo = lo; | |
81 | return r; | |
82 | } | |
83 | ||
caf8a9b2 | 84 | /* Return a u64 value representing SIZE. */ |
a0d4efe9 | 85 | _GL_U64_INLINE u64 |
caf8a9b2 PE |
86 | u64size (size_t size) |
87 | { | |
88 | u64 r; | |
89 | r.hi = size >> 31 >> 1; | |
90 | r.lo = size; | |
91 | return r; | |
92 | } | |
93 | ||
3ce9d0d4 | 94 | /* Return X < Y. */ |
a0d4efe9 | 95 | _GL_U64_INLINE int |
3ce9d0d4 LL |
96 | u64lt (u64 x, u64 y) |
97 | { | |
98 | return x.hi < y.hi || (x.hi == y.hi && x.lo < y.lo); | |
99 | } | |
100 | ||
101 | /* Return X & Y. */ | |
a0d4efe9 | 102 | _GL_U64_INLINE u64 |
3ce9d0d4 LL |
103 | u64and (u64 x, u64 y) |
104 | { | |
105 | u64 r; | |
106 | r.hi = x.hi & y.hi; | |
107 | r.lo = x.lo & y.lo; | |
108 | return r; | |
109 | } | |
110 | ||
111 | /* Return X | Y. */ | |
a0d4efe9 | 112 | _GL_U64_INLINE u64 |
3ce9d0d4 LL |
113 | u64or (u64 x, u64 y) |
114 | { | |
115 | u64 r; | |
116 | r.hi = x.hi | y.hi; | |
117 | r.lo = x.lo | y.lo; | |
118 | return r; | |
119 | } | |
120 | ||
121 | /* Return X ^ Y. */ | |
a0d4efe9 | 122 | _GL_U64_INLINE u64 |
3ce9d0d4 LL |
123 | u64xor (u64 x, u64 y) |
124 | { | |
125 | u64 r; | |
126 | r.hi = x.hi ^ y.hi; | |
127 | r.lo = x.lo ^ y.lo; | |
128 | return r; | |
129 | } | |
130 | ||
131 | /* Return X + Y. */ | |
a0d4efe9 | 132 | _GL_U64_INLINE u64 |
3ce9d0d4 LL |
133 | u64plus (u64 x, u64 y) |
134 | { | |
135 | u64 r; | |
136 | r.lo = x.lo + y.lo; | |
137 | r.hi = x.hi + y.hi + (r.lo < x.lo); | |
138 | return r; | |
139 | } | |
140 | ||
141 | /* Return X << N. */ | |
a0d4efe9 | 142 | _GL_U64_INLINE u64 |
3ce9d0d4 LL |
143 | u64shl (u64 x, int n) |
144 | { | |
145 | u64 r; | |
146 | if (n < 32) | |
147 | { | |
148 | r.hi = (x.hi << n) | (x.lo >> (32 - n)); | |
149 | r.lo = x.lo << n; | |
150 | } | |
151 | else | |
152 | { | |
153 | r.hi = x.lo << (n - 32); | |
154 | r.lo = 0; | |
155 | } | |
156 | return r; | |
157 | } | |
158 | ||
159 | /* Return X >> N. */ | |
a0d4efe9 | 160 | _GL_U64_INLINE u64 |
3ce9d0d4 LL |
161 | u64shr (u64 x, int n) |
162 | { | |
163 | u64 r; | |
164 | if (n < 32) | |
165 | { | |
166 | r.hi = x.hi >> n; | |
167 | r.lo = (x.hi << (32 - n)) | (x.lo >> n); | |
168 | } | |
169 | else | |
170 | { | |
171 | r.hi = 0; | |
172 | r.lo = x.hi >> (n - 32); | |
173 | } | |
174 | return r; | |
175 | } | |
176 | ||
177 | #endif | |
a0d4efe9 PE |
178 | |
179 | _GL_INLINE_HEADER_END |