1 /* uint64_t-like operations that work even on hosts lacking uint64_t
3 Copyright (C) 2006, 2009, 2010 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. */
23 /* Return X rotated left by N bits, where 0 < N < 64. */
24 #define u64rol(x, n) u64or (u64shl (x, n), u64shr (x, 64 - n))
28 /* Native implementations are trivial. See below for comments on what
29 these operations do. */
31 # define u64hilo(hi, lo) ((u64) (((u64) (hi) << 32) + (lo)))
32 # define u64init(hi, lo) u64hilo (hi, lo)
33 # define u64lo(x) ((u64) (x))
34 # define u64lt(x, y) ((x) < (y))
35 # define u64and(x, y) ((x) & (y))
36 # define u64or(x, y) ((x) | (y))
37 # define u64xor(x, y) ((x) ^ (y))
38 # define u64plus(x, y) ((x) + (y))
39 # define u64shl(x, n) ((x) << (n))
40 # define u64shr(x, n) ((x) >> (n))
44 /* u64 is a 64-bit unsigned integer value.
45 u64init (HI, LO), is like u64hilo (HI, LO), but for use in
46 initializer contexts. */
47 # ifdef WORDS_BIGENDIAN
48 typedef struct { uint32_t hi, lo; } u64;
49 # define u64init(hi, lo) { hi, lo }
51 typedef struct { uint32_t lo, hi; } u64;
52 # define u64init(hi, lo) { lo, hi }
55 /* Given the high and low-order 32-bit quantities HI and LO, return a u64
56 value representing (HI << 32) + LO. */
58 u64hilo (uint32_t hi, uint32_t lo)
66 /* Return a u64 value representing LO. */
80 return x.hi < y.hi || (x.hi == y.hi && x.lo < y.lo);
105 u64xor (u64 x, u64 y)
115 u64plus (u64 x, u64 y)
119 r.hi = x.hi + y.hi + (r.lo < x.lo);
125 u64shl (u64 x, int n)
130 r.hi = (x.hi << n) | (x.lo >> (32 - n));
135 r.hi = x.lo << (n - 32);
143 u64shr (u64 x, int n)
149 r.lo = (x.hi << (32 - n)) | (x.lo >> n);
154 r.lo = x.hi >> (n - 32);