/usr/include/giac/tinymt32.h is in libgiac-dev 1.2.3.57+dfsg1-2build3.
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 | #ifndef TINYMT32_H
#define TINYMT32_H
/**
* @file tinymt32.h
*
* @brief Tiny Mersenne Twister only 127 bit internal state
*
* @author Mutsuo Saito (Hiroshima University)
* @author Makoto Matsumoto (University of Tokyo)
* with modifications for giac by B. Parisse
*
* Copyright (C) 2011 Mutsuo Saito, Makoto Matsumoto,
* Hiroshima University and The University of Tokyo.
* All rights reserved.
*
* The 3-clause BSD License is applied to this software, see
* tinymt32_license.h
*/
#include <stdint.h>
#include <inttypes.h>
#define TINYMT32_MEXP 127
#define TINYMT32_SH0 1
#define TINYMT32_SH1 10
#define TINYMT32_SH8 8
#define TINYMT32_MASK uint32_t(0x7fffffff)
#define TINYMT32_MUL (1.0f / 4294967296.0f)
/**
* tinymt32 internal state vector and parameters
*/
struct tinymt32_t;
void tinymt32_init(tinymt32_t * random, uint32_t seed);
void tinymt32_init_by_array(tinymt32_t * random, uint32_t init_key[],
int key_length);
struct tinymt32_t {
uint32_t status[4];
uint32_t mat1;
uint32_t mat2;
uint32_t tmat;
tinymt32_t(uint32_t seed=1234567){ tinymt32_init(this,seed);}
};
#if defined(__GNUC__)
/**
* This function always returns 127
* @param random not used
* @return always 127
*/
inline static int tinymt32_get_mexp(
tinymt32_t * random __attribute__((unused))) {
return TINYMT32_MEXP;
}
#else
inline static int tinymt32_get_mexp(tinymt32_t * random) {
return TINYMT32_MEXP;
}
#endif
/**
* This function changes internal state of tinymt32.
* Users should not call this function directly.
* @param random tinymt internal status
*/
inline static void tinymt32_next_state(tinymt32_t * random) {
uint32_t x;
uint32_t y;
y = random->status[3];
x = (random->status[0] & TINYMT32_MASK)
^ random->status[1]
^ random->status[2];
x ^= (x << TINYMT32_SH0);
y ^= (y >> TINYMT32_SH0) ^ x;
random->status[0] = random->status[1];
random->status[1] = random->status[2];
random->status[2] = x ^ (y << TINYMT32_SH1);
random->status[3] = y;
random->status[1] ^= -((int32_t)(y & 1)) & random->mat1;
random->status[2] ^= -((int32_t)(y & 1)) & random->mat2;
}
/**
* This function outputs 32-bit unsigned integer from internal state.
* Users should not call this function directly.
* @param random tinymt internal status
* @return 32-bit unsigned pseudorandom number
*/
inline static uint32_t tinymt32_temper(tinymt32_t * random) {
uint32_t t0, t1;
t0 = random->status[3];
#if defined(LINEARITY_CHECK)
t1 = random->status[0]
^ (random->status[2] >> TINYMT32_SH8);
#else
t1 = random->status[0]
+ (random->status[2] >> TINYMT32_SH8);
#endif
t0 ^= t1;
t0 ^= -((int32_t)(t1 & 1)) & random->tmat;
return t0;
}
/**
* This function outputs floating point number from internal state.
* Users should not call this function directly.
* @param random tinymt internal status
* @return floating point number r (1.0 <= r < 2.0)
*/
inline static float tinymt32_temper_conv(tinymt32_t * random) {
uint32_t t0, t1;
union {
uint32_t u;
float f;
} conv;
t0 = random->status[3];
#if defined(LINEARITY_CHECK)
t1 = random->status[0]
^ (random->status[2] >> TINYMT32_SH8);
#else
t1 = random->status[0]
+ (random->status[2] >> TINYMT32_SH8);
#endif
t0 ^= t1;
conv.u = ((t0 ^ (-((int32_t)(t1 & 1)) & random->tmat)) >> 9)
| uint32_t(0x3f800000);
return conv.f;
}
/**
* This function outputs floating point number from internal state.
* Users should not call this function directly.
* @param random tinymt internal status
* @return floating point number r (1.0 < r < 2.0)
*/
inline static float tinymt32_temper_conv_open(tinymt32_t * random) {
uint32_t t0, t1;
union {
uint32_t u;
float f;
} conv;
t0 = random->status[3];
#if defined(LINEARITY_CHECK)
t1 = random->status[0]
^ (random->status[2] >> TINYMT32_SH8);
#else
t1 = random->status[0]
+ (random->status[2] >> TINYMT32_SH8);
#endif
t0 ^= t1;
conv.u = ((t0 ^ (-((int32_t)(t1 & 1)) & random->tmat)) >> 9)
| uint32_t(0x3f800001);
return conv.f;
}
/**
* This function outputs 32-bit unsigned integer from internal state.
* @param random tinymt internal status
* @return 32-bit unsigned integer r (0 <= r < 2^32)
*/
inline static uint32_t tinymt32_generate_uint32(tinymt32_t * random) {
tinymt32_next_state(random);
return tinymt32_temper(random);
}
/**
* This function outputs floating point number from internal state.
* This function is implemented using multiplying by 1 / 2^32.
* floating point multiplication is faster than using union trick in
* my Intel CPU.
* @param random tinymt internal status
* @return floating point number r (0.0 <= r < 1.0)
*/
inline static float tinymt32_generate_float(tinymt32_t * random) {
tinymt32_next_state(random);
return tinymt32_temper(random) * TINYMT32_MUL;
}
/**
* This function outputs floating point number from internal state.
* This function is implemented using union trick.
* @param random tinymt internal status
* @return floating point number r (1.0 <= r < 2.0)
*/
inline static float tinymt32_generate_float12(tinymt32_t * random) {
tinymt32_next_state(random);
return tinymt32_temper_conv(random);
}
/**
* This function outputs floating point number from internal state.
* This function is implemented using union trick.
* @param random tinymt internal status
* @return floating point number r (0.0 <= r < 1.0)
*/
inline static float tinymt32_generate_float01(tinymt32_t * random) {
tinymt32_next_state(random);
return tinymt32_temper_conv(random) - 1.0f;
}
/**
* This function outputs floating point number from internal state.
* This function may return 1.0 and never returns 0.0.
* @param random tinymt internal status
* @return floating point number r (0.0 < r <= 1.0)
*/
inline static float tinymt32_generate_floatOC(tinymt32_t * random) {
tinymt32_next_state(random);
return 1.0f - tinymt32_generate_float(random);
}
/**
* This function outputs floating point number from internal state.
* This function returns neither 0.0 nor 1.0.
* @param random tinymt internal status
* @return floating point number r (0.0 < r < 0.0)
*/
inline static float tinymt32_generate_floatOO(tinymt32_t * random) {
tinymt32_next_state(random);
return tinymt32_temper_conv_open(random) - 1.0f;
}
/**
* This function outputs double precision floating point number from
* internal state. The returned value has 32-bit precision.
* In other words, this function makes one double precision floating point
* number from one 32-bit unsigned integer.
* @param random tinymt internal status
* @return floating point number r (1.0 < r < 2.0)
*/
inline static double tinymt32_generate_32double(tinymt32_t * random) {
tinymt32_next_state(random);
return tinymt32_temper(random) * (1.0 / 4294967296.0);
}
#endif
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