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1 /* uint64_t-like operations that work even on hosts lacking uint64_t
3 Copyright (C) 2006, 2009-2013 Free Software Foundation, Inc.
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.
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.
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/>. */
18 /* Written by Paul Eggert. */
20 #include <stdint.h>
22 _GL_INLINE_HEADER_BEGIN
23 #ifndef _GL_U64_INLINE
24 # define _GL_U64_INLINE _GL_INLINE
25 #endif
27 /* Return X rotated left by N bits, where 0 < N < 64. */
28 #define u64rol(x, n) u64or (u64shl (x, n), u64shr (x, 64 - n))
30 #ifdef UINT64_MAX
32 /* Native implementations are trivial. See below for comments on what
33 these operations do. */
34 typedef uint64_t u64;
35 # define u64hilo(hi, lo) ((u64) (((u64) (hi) << 32) + (lo)))
36 # define u64init(hi, lo) u64hilo (hi, lo)
37 # define u64lo(x) ((u64) (x))
38 # define u64size(x) u64lo (x)
39 # define u64lt(x, y) ((x) < (y))
40 # define u64and(x, y) ((x) & (y))
41 # define u64or(x, y) ((x) | (y))
42 # define u64xor(x, y) ((x) ^ (y))
43 # define u64plus(x, y) ((x) + (y))
44 # define u64shl(x, n) ((x) << (n))
45 # define u64shr(x, n) ((x) >> (n))
47 #else
49 /* u64 is a 64-bit unsigned integer value.
50 u64init (HI, LO), is like u64hilo (HI, LO), but for use in
51 initializer contexts. */
52 # ifdef WORDS_BIGENDIAN
53 typedef struct { uint32_t hi, lo; } u64;
54 # define u64init(hi, lo) { hi, lo }
55 # else
56 typedef struct { uint32_t lo, hi; } u64;
57 # define u64init(hi, lo) { lo, hi }
58 # endif
60 /* Given the high and low-order 32-bit quantities HI and LO, return a u64
61 value representing (HI << 32) + LO. */
62 _GL_U64_INLINE u64
63 u64hilo (uint32_t hi, uint32_t lo)
65 u64 r;
66 r.hi = hi;
67 r.lo = lo;
68 return r;
71 /* Return a u64 value representing LO. */
72 _GL_U64_INLINE u64
73 u64lo (uint32_t lo)
75 u64 r;
76 r.hi = 0;
77 r.lo = lo;
78 return r;
81 /* Return a u64 value representing SIZE. */
82 _GL_U64_INLINE u64
83 u64size (size_t size)
85 u64 r;
86 r.hi = size >> 31 >> 1;
87 r.lo = size;
88 return r;
91 /* Return X < Y. */
92 _GL_U64_INLINE int
93 u64lt (u64 x, u64 y)
95 return x.hi < y.hi || (x.hi == y.hi && x.lo < y.lo);
98 /* Return X & Y. */
99 _GL_U64_INLINE u64
100 u64and (u64 x, u64 y)
102 u64 r;
103 r.hi = x.hi & y.hi;
104 r.lo = x.lo & y.lo;
105 return r;
108 /* Return X | Y. */
109 _GL_U64_INLINE u64
110 u64or (u64 x, u64 y)
112 u64 r;
113 r.hi = x.hi | y.hi;
114 r.lo = x.lo | y.lo;
115 return r;
118 /* Return X ^ Y. */
119 _GL_U64_INLINE u64
120 u64xor (u64 x, u64 y)
122 u64 r;
123 r.hi = x.hi ^ y.hi;
124 r.lo = x.lo ^ y.lo;
125 return r;
128 /* Return X + Y. */
129 _GL_U64_INLINE u64
130 u64plus (u64 x, u64 y)
132 u64 r;
133 r.lo = x.lo + y.lo;
134 r.hi = x.hi + y.hi + (r.lo < x.lo);
135 return r;
138 /* Return X << N. */
139 _GL_U64_INLINE u64
140 u64shl (u64 x, int n)
142 u64 r;
143 if (n < 32)
145 r.hi = (x.hi << n) | (x.lo >> (32 - n));
146 r.lo = x.lo << n;
148 else
150 r.hi = x.lo << (n - 32);
151 r.lo = 0;
153 return r;
156 /* Return X >> N. */
157 _GL_U64_INLINE u64
158 u64shr (u64 x, int n)
160 u64 r;
161 if (n < 32)
163 r.hi = x.hi >> n;
164 r.lo = (x.hi << (32 - n)) | (x.lo >> n);
166 else
168 r.hi = 0;
169 r.lo = x.hi >> (n - 32);
171 return r;
174 #endif
176 _GL_INLINE_HEADER_END