| Line | Branch | Decision | Exec | Source |
|---|---|---|---|---|
| 1 | #ifndef TINYMT32_H | |||
| 2 | #define TINYMT32_H | |||
| 3 | /** | |||
| 4 | * @file tinymt32.h | |||
| 5 | * | |||
| 6 | * @brief Tiny Mersenne Twister only 127 bit internal state | |||
| 7 | * | |||
| 8 | * @author Mutsuo Saito (Hiroshima University) | |||
| 9 | * @author Makoto Matsumoto (University of Tokyo) | |||
| 10 | * | |||
| 11 | * Copyright (C) 2011 Mutsuo Saito, Makoto Matsumoto, | |||
| 12 | * Hiroshima University and The University of Tokyo. | |||
| 13 | * All rights reserved. | |||
| 14 | * | |||
| 15 | * The 3-clause BSD License is applied to this software, see | |||
| 16 | * LICENSE.txt | |||
| 17 | */ | |||
| 18 | ||||
| 19 | #include <stdint.h> | |||
| 20 | #include <inttypes.h> | |||
| 21 | ||||
| 22 | #define TINYMT32_MEXP 127 | |||
| 23 | #define TINYMT32_SH0 1 | |||
| 24 | #define TINYMT32_SH1 10 | |||
| 25 | #define TINYMT32_SH8 8 | |||
| 26 | #define TINYMT32_MASK UINT32_C(0x7fffffff) | |||
| 27 | #define TINYMT32_MUL (1.0f / 16777216.0f) | |||
| 28 | ||||
| 29 | #if defined(__cplusplus) | |||
| 30 | extern "C" { | |||
| 31 | #endif | |||
| 32 | ||||
| 33 | /** | |||
| 34 | * tinymt32 internal state vector and parameters | |||
| 35 | */ | |||
| 36 | struct TINYMT32_T { | |||
| 37 | uint32_t status[4]; | |||
| 38 | uint32_t mat1; | |||
| 39 | uint32_t mat2; | |||
| 40 | uint32_t tmat; | |||
| 41 | }; | |||
| 42 | ||||
| 43 | typedef struct TINYMT32_T tinymt32_t; | |||
| 44 | ||||
| 45 | void tinymt32_init(tinymt32_t * random, uint32_t seed); | |||
| 46 | void tinymt32_init_by_array(tinymt32_t * random, uint32_t init_key[], | |||
| 47 | int key_length); | |||
| 48 | ||||
| 49 | #if defined(__GNUC__) | |||
| 50 | /** | |||
| 51 | * This function always returns 127 | |||
| 52 | * @param random not used | |||
| 53 | * @return always 127 | |||
| 54 | */ | |||
| 55 | inline static int tinymt32_get_mexp( | |||
| 56 | tinymt32_t * random __attribute__((unused))) { | |||
| 57 | return TINYMT32_MEXP; | |||
| 58 | } | |||
| 59 | #else | |||
| 60 | inline static int tinymt32_get_mexp(tinymt32_t * random) { | |||
| 61 | return TINYMT32_MEXP; | |||
| 62 | } | |||
| 63 | #endif | |||
| 64 | ||||
| 65 | /** | |||
| 66 | * This function changes internal state of tinymt32. | |||
| 67 | * Users should not call this function directly. | |||
| 68 | * @param random tinymt internal status | |||
| 69 | */ | |||
| 70 | 18913 | inline static void tinymt32_next_state(tinymt32_t * random) { | ||
| 71 | uint32_t x; | |||
| 72 | uint32_t y; | |||
| 73 | ||||
| 74 | 18913 | y = random->status[3]; | ||
| 75 | 18913 | x = (random->status[0] & TINYMT32_MASK) | ||
| 76 | 18913 | ^ random->status[1] | ||
| 77 | 18913 | ^ random->status[2]; | ||
| 78 | 18913 | x ^= (x << TINYMT32_SH0); | ||
| 79 | 18913 | y ^= (y >> TINYMT32_SH0) ^ x; | ||
| 80 | 18913 | random->status[0] = random->status[1]; | ||
| 81 | 18913 | random->status[1] = random->status[2]; | ||
| 82 | 18913 | random->status[2] = x ^ (y << TINYMT32_SH1); | ||
| 83 | 18913 | random->status[3] = y; | ||
| 84 | 18913 | int32_t const a = -((int32_t)(y & 1)) & (int32_t)random->mat1; | ||
| 85 | 18913 | int32_t const b = -((int32_t)(y & 1)) & (int32_t)random->mat2; | ||
| 86 | 18913 | random->status[1] ^= (uint32_t)a; | ||
| 87 | 18913 | random->status[2] ^= (uint32_t)b; | ||
| 88 | 18913 | } | ||
| 89 | ||||
| 90 | /** | |||
| 91 | * This function outputs 32-bit unsigned integer from internal state. | |||
| 92 | * Users should not call this function directly. | |||
| 93 | * @param random tinymt internal status | |||
| 94 | * @return 32-bit unsigned pseudorandom number | |||
| 95 | */ | |||
| 96 | 1001 | inline static uint32_t tinymt32_temper(tinymt32_t * random) { | ||
| 97 | uint32_t t0, t1; | |||
| 98 | 1001 | t0 = random->status[3]; | ||
| 99 | #if defined(LINEARITY_CHECK) | |||
| 100 | t1 = random->status[0] | |||
| 101 | ^ (random->status[2] >> TINYMT32_SH8); | |||
| 102 | #else | |||
| 103 | 1001 | t1 = random->status[0] | ||
| 104 | 1001 | + (random->status[2] >> TINYMT32_SH8); | ||
| 105 | #endif | |||
| 106 | 1001 | t0 ^= t1; | ||
| 107 |
2/2✓ Branch 0 taken 563 times.
✓ Branch 1 taken 438 times.
|
2/2✓ Decision 'true' taken 563 times.
✓ Decision 'false' taken 438 times.
|
1001 | if ((t1 & 1) != 0) { |
| 108 | 563 | t0 ^= random->tmat; | ||
| 109 | } | |||
| 110 | 1001 | return t0; | ||
| 111 | } | |||
| 112 | ||||
| 113 | /** | |||
| 114 | * This function outputs floating point number from internal state. | |||
| 115 | * Users should not call this function directly. | |||
| 116 | * @param random tinymt internal status | |||
| 117 | * @return floating point number r (1.0 <= r < 2.0) | |||
| 118 | */ | |||
| 119 | inline static float tinymt32_temper_conv(tinymt32_t * random) { | |||
| 120 | uint32_t t0, t1; | |||
| 121 | union { | |||
| 122 | uint32_t u; | |||
| 123 | float f; | |||
| 124 | } conv; | |||
| 125 | ||||
| 126 | t0 = random->status[3]; | |||
| 127 | #if defined(LINEARITY_CHECK) | |||
| 128 | t1 = random->status[0] | |||
| 129 | ^ (random->status[2] >> TINYMT32_SH8); | |||
| 130 | #else | |||
| 131 | t1 = random->status[0] | |||
| 132 | + (random->status[2] >> TINYMT32_SH8); | |||
| 133 | #endif | |||
| 134 | t0 ^= t1; | |||
| 135 | if ((t1 & 1) != 0) { | |||
| 136 | conv.u = ((t0 ^ random->tmat) >> 9) | UINT32_C(0x3f800000); | |||
| 137 | } else { | |||
| 138 | conv.u = (t0 >> 9) | UINT32_C(0x3f800000); | |||
| 139 | } | |||
| 140 | return conv.f; | |||
| 141 | } | |||
| 142 | ||||
| 143 | /** | |||
| 144 | * This function outputs floating point number from internal state. | |||
| 145 | * Users should not call this function directly. | |||
| 146 | * @param random tinymt internal status | |||
| 147 | * @return floating point number r (1.0 < r < 2.0) | |||
| 148 | */ | |||
| 149 | inline static float tinymt32_temper_conv_open(tinymt32_t * random) { | |||
| 150 | uint32_t t0, t1; | |||
| 151 | union { | |||
| 152 | uint32_t u; | |||
| 153 | float f; | |||
| 154 | } conv; | |||
| 155 | ||||
| 156 | t0 = random->status[3]; | |||
| 157 | #if defined(LINEARITY_CHECK) | |||
| 158 | t1 = random->status[0] | |||
| 159 | ^ (random->status[2] >> TINYMT32_SH8); | |||
| 160 | #else | |||
| 161 | t1 = random->status[0] | |||
| 162 | + (random->status[2] >> TINYMT32_SH8); | |||
| 163 | #endif | |||
| 164 | t0 ^= t1; | |||
| 165 | if ((t1 & 1) != 0) { | |||
| 166 | conv.u = ((t0 ^ random->tmat) >> 9) | UINT32_C(0x3f800001); | |||
| 167 | } else { | |||
| 168 | conv.u = (t0 >> 9) | UINT32_C(0x3f800001); | |||
| 169 | } | |||
| 170 | return conv.f; | |||
| 171 | } | |||
| 172 | ||||
| 173 | /** | |||
| 174 | * This function outputs 32-bit unsigned integer from internal state. | |||
| 175 | * @param random tinymt internal status | |||
| 176 | * @return 32-bit unsigned integer r (0 <= r < 2^32) | |||
| 177 | */ | |||
| 178 | inline static uint32_t tinymt32_generate_uint32(tinymt32_t * random) { | |||
| 179 | tinymt32_next_state(random); | |||
| 180 | return tinymt32_temper(random); | |||
| 181 | } | |||
| 182 | ||||
| 183 | /** | |||
| 184 | * This function outputs floating point number from internal state. | |||
| 185 | * This function is implemented using multiplying by (1 / 2^24). | |||
| 186 | * floating point multiplication is faster than using union trick in | |||
| 187 | * my Intel CPU. | |||
| 188 | * @param random tinymt internal status | |||
| 189 | * @return floating point number r (0.0 <= r < 1.0) | |||
| 190 | */ | |||
| 191 | 1001 | inline static float tinymt32_generate_float(tinymt32_t * random) { | ||
| 192 | 1001 | tinymt32_next_state(random); | ||
| 193 | 1001 | return (float)(tinymt32_temper(random) >> 8) * TINYMT32_MUL; | ||
| 194 | } | |||
| 195 | ||||
| 196 | /** | |||
| 197 | * This function outputs floating point number from internal state. | |||
| 198 | * This function is implemented using union trick. | |||
| 199 | * @param random tinymt internal status | |||
| 200 | * @return floating point number r (1.0 <= r < 2.0) | |||
| 201 | */ | |||
| 202 | inline static float tinymt32_generate_float12(tinymt32_t * random) { | |||
| 203 | tinymt32_next_state(random); | |||
| 204 | return tinymt32_temper_conv(random); | |||
| 205 | } | |||
| 206 | ||||
| 207 | /** | |||
| 208 | * This function outputs floating point number from internal state. | |||
| 209 | * This function is implemented using union trick. | |||
| 210 | * @param random tinymt internal status | |||
| 211 | * @return floating point number r (0.0 <= r < 1.0) | |||
| 212 | */ | |||
| 213 | inline static float tinymt32_generate_float01(tinymt32_t * random) { | |||
| 214 | tinymt32_next_state(random); | |||
| 215 | return tinymt32_temper_conv(random) - 1.0f; | |||
| 216 | } | |||
| 217 | ||||
| 218 | /** | |||
| 219 | * This function outputs floating point number from internal state. | |||
| 220 | * This function may return 1.0 and never returns 0.0. | |||
| 221 | * @param random tinymt internal status | |||
| 222 | * @return floating point number r (0.0 < r <= 1.0) | |||
| 223 | */ | |||
| 224 | inline static float tinymt32_generate_floatOC(tinymt32_t * random) { | |||
| 225 | tinymt32_next_state(random); | |||
| 226 | return 1.0f - tinymt32_generate_float(random); | |||
| 227 | } | |||
| 228 | ||||
| 229 | /** | |||
| 230 | * This function outputs floating point number from internal state. | |||
| 231 | * This function returns neither 0.0 nor 1.0. | |||
| 232 | * @param random tinymt internal status | |||
| 233 | * @return floating point number r (0.0 < r < 1.0) | |||
| 234 | */ | |||
| 235 | inline static float tinymt32_generate_floatOO(tinymt32_t * random) { | |||
| 236 | tinymt32_next_state(random); | |||
| 237 | return tinymt32_temper_conv_open(random) - 1.0f; | |||
| 238 | } | |||
| 239 | ||||
| 240 | /** | |||
| 241 | * This function outputs double precision floating point number from | |||
| 242 | * internal state. The returned value has 32-bit precision. | |||
| 243 | * In other words, this function makes one double precision floating point | |||
| 244 | * number from one 32-bit unsigned integer. | |||
| 245 | * @param random tinymt internal status | |||
| 246 | * @return floating point number r (0.0 <= r < 1.0) | |||
| 247 | */ | |||
| 248 | inline static double tinymt32_generate_32double(tinymt32_t * random) { | |||
| 249 | tinymt32_next_state(random); | |||
| 250 | return tinymt32_temper(random) * (1.0 / 4294967296.0); | |||
| 251 | } | |||
| 252 | ||||
| 253 | #if defined(__cplusplus) | |||
| 254 | } | |||
| 255 | #endif | |||
| 256 | ||||
| 257 | #endif | |||
| 258 |