/usr/include/sdsl/uint256_t.hpp is in libsdsl-dev 2.0.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 | /* sdsl - succinct data structures library
Copyright (C) 2012 Simon Gog
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/ .
*/
/*! \file uint256_t.hpp
\brief uint256_t.hpp contains a class for 256-bit unsigned integers.
\author Simon Gog
*/
#ifndef INCLUDED_SDSL_UINT256
#define INCLUDED_SDSL_UINT256
#include <iostream>
#include "bits.hpp"
#include "uint128_t.hpp"
namespace sdsl
{
class uint256_t
{
public:
friend std::ostream& operator << (std::ostream&, const uint256_t&);
private:
uint64_t m_lo;
uint64_t m_mid;
uint128_t m_high;
public:
inline uint256_t(uint64_t lo=0, uint64_t mid=0, uint128_t high=0):m_lo(lo),
m_mid(mid), m_high(high) {}
inline uint256_t(const uint256_t& x):m_lo(x.m_lo), m_mid(x.m_mid),
m_high(x.m_high) {}
inline uint256_t(uint256_t&& x):m_lo(std::move(x.m_lo)),
m_mid(std::move(x.m_mid)), m_high(std::move(x.m_high)) {}
uint256_t& operator=(const uint256_t& x) {
m_lo = x.m_lo;
m_mid = x.m_mid;
m_high = x.m_high;
return *this;
}
uint256_t& operator=(uint256_t&& x) {
m_lo = std::move(x.m_lo);
m_mid = std::move(x.m_mid);
m_high = std::move(x.m_high);
return *this;
}
inline uint16_t popcount() {
return ((uint16_t)bits::cnt(m_lo)) + bits::cnt(m_mid)
+ bits::cnt(m_high>>64) + bits::cnt(m_high);
}
inline uint16_t hi() {
if (m_high == 0) {
if (m_mid) {
return bits::hi(m_mid) + 64;
} else {
return bits::hi(m_lo);
}
} else {
uint64_t hh = (m_high >> 64);
if (hh) {
return bits::hi(hh) + 192;
} else {
return bits::hi(m_high) + 128;
}
}
}
inline uint16_t select(uint32_t i) {
uint16_t x = 0;
if ((x=bits::cnt(m_lo)) >= i) {
return bits::sel(m_lo, i);
}
i -= x;
if ((x=bits::cnt(m_mid)) >= i) {
return bits::sel(m_mid, i) + 64;
}
i -= x;
uint64_t hh = m_high >> 64;
uint64_t lh = m_high;
if ((x=bits::cnt(lh)) >= i) {
return bits::sel(lh, i) + 128;
}
i -= x;
return bits::sel(hh, i) + 192;
}
inline uint256_t& operator+=(const uint256_t& x) {
uint128_t lo = (uint128_t)m_lo + x.m_lo;
uint128_t mid = (uint128_t)m_mid + x.m_mid + (lo >> 64);
m_lo = lo; m_mid = mid;
m_high += x.m_high + (mid >> 64);
return *this;
// return uint256_t(lo, mid, m_high + x.m_high + (mid >> 64));
}
inline uint256_t operator+(const uint256_t& x) {
uint128_t lo = ((uint128_t)m_lo) + x.m_lo;
uint128_t mid = (uint128_t)m_mid + x.m_mid + (lo >> 64);
return uint256_t(lo, mid, m_high + x.m_high + (mid >> 64));
}
inline uint256_t operator-(const uint256_t& x) {
// add two's complement of x
uint128_t lo = (uint128_t)m_lo + (~x.m_lo) + 1;
uint128_t mid = (uint128_t)m_mid + (~x.m_mid) + (lo >> 64);
return uint256_t(lo, mid, m_high + (~x.m_high) + (mid >> 64));
}
inline uint256_t& operator-=(const uint256_t& x) {
// add two's complement of x
uint128_t lo = (uint128_t)m_lo + (~x.m_lo) + 1;
uint128_t mid = (uint128_t)m_mid + (~x.m_mid) + (lo >> 64);
m_lo = lo;
m_mid = mid;
m_high += (~x.m_high) + (mid >> 64);
return *this;
}
inline uint256_t operator|(const uint256_t& x) {
return uint256_t(m_lo|x.m_lo, m_mid|x.m_mid, m_high|x.m_high);
}
inline uint256_t& operator|=(const uint256_t& x) {
m_lo |= x.m_lo; m_mid |= x.m_mid; m_high |= x.m_high;
return *this;
}
inline uint256_t operator&(const uint256_t& x) {
return uint256_t(m_lo&x.m_lo, m_mid&x.m_mid, m_high&x.m_high);
}
/* // is not needed since we can convert uint256_t to uint64_t
uint64_t operator&(uint64_t x){
return m_lo & x;
}
*/
inline uint256_t operator<<(int x) {
if (x < 128) {
uint128_t high = m_high << x;
uint128_t low = (((uint128_t)m_mid<<64) | m_lo);
high |= (low >> (128-x));
low = low << x;
return uint256_t(low, low>>64, high);
} else { // x >= 128
uint128_t high = (((uint128_t)m_mid<<64) | m_lo) << (x-128); // TODO: check x==128
return uint256_t(0, 0, high);
}
}
inline uint256_t operator>>(int x) {
if (x < 128) {
uint128_t low = (((uint128_t)m_mid<<64) | m_lo) >> x;
low |= ((m_high << (127-x))<<1);
return uint256_t(low, low>>64, m_high>>x);
} else { // x >= 128
uint128_t low = (m_high >> (x-128)); // TODO: check x=128
return uint256_t(low, low>>64, 0);
}
}
inline uint256_t& operator=(const uint64_t& x) {
m_high = 0;
m_mid = 0;
m_lo = x;
return *this;
}
inline bool operator==(const uint256_t& x) const {
return (m_lo == x.m_lo) and (m_mid == x.m_mid) and (m_high == x.m_high);
}
inline bool operator!=(const uint256_t& x) const {
return !(*this == x);
}
inline bool operator>=(const uint256_t& x) const {
if (m_high != x.m_high) {
return m_high > x.m_high;
}
if (m_mid != x.m_mid) {
return m_mid > x.m_mid;
} else {
return m_lo >= x.m_lo;
}
}
inline bool operator<=(const uint256_t& x) const {
if (m_high != x.m_high) {
return m_high < x.m_high;
}
if (m_mid != x.m_mid) {
return m_mid < x.m_mid;
} else {
return m_lo <= x.m_lo;
}
}
inline bool operator>(const uint256_t& x) const {
if (m_high != x.m_high) {
return m_high > x.m_high;
}
if (m_mid != x.m_mid) {
return m_mid > x.m_mid;
} else {
return m_lo > x.m_lo;
}
}
inline bool operator>(const uint64_t& x) const {
if (m_high > 0 or m_mid > 0) {
return true;
}
return m_lo > x;
}
inline bool operator<(const uint256_t& x) const {
if (m_high != x.m_high) {
return m_high < x.m_high;
}
if (m_mid != x.m_mid) {
return m_mid < x.m_mid;
} else {
return m_lo < x.m_lo;
}
}
inline operator uint64_t() {
return m_lo;
}
};
std::ostream& operator<<(std::ostream& os, const uint256_t& x);
} // end namespace
#endif
|