mirror of
https://github.com/ZDoom/qzdoom-gpl.git
synced 2024-11-16 09:11:17 +00:00
7371c4a516
cryptographically secure random number generator, if available, instead of the current time. - Changed the random number generator from Lee Killough's algorithm to the SFMT607 variant of the Mersenne Twister. SVN r1507 (trunk)
156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/**
|
|
* @file SFMT-alti.h
|
|
*
|
|
* @brief SIMD oriented Fast Mersenne Twister(SFMT)
|
|
* pseudorandom number generator
|
|
*
|
|
* @author Mutsuo Saito (Hiroshima University)
|
|
* @author Makoto Matsumoto (Hiroshima University)
|
|
*
|
|
* Copyright (C) 2007 Mutsuo Saito, Makoto Matsumoto and Hiroshima
|
|
* University. All rights reserved.
|
|
*
|
|
* The new BSD License is applied to this software.
|
|
* see LICENSE.txt
|
|
*/
|
|
|
|
#ifndef SFMT_ALTI_H
|
|
#define SFMT_ALTI_H
|
|
|
|
inline static vector unsigned int vec_recursion(vector unsigned int a,
|
|
vector unsigned int b,
|
|
vector unsigned int c,
|
|
vector unsigned int d)
|
|
ALWAYSINLINE;
|
|
|
|
/**
|
|
* This function represents the recursion formula in AltiVec and BIG ENDIAN.
|
|
* @param a a 128-bit part of the interal state array
|
|
* @param b a 128-bit part of the interal state array
|
|
* @param c a 128-bit part of the interal state array
|
|
* @param d a 128-bit part of the interal state array
|
|
* @return output
|
|
*/
|
|
inline static vector unsigned int vec_recursion(vector unsigned int a,
|
|
vector unsigned int b,
|
|
vector unsigned int c,
|
|
vector unsigned int d) {
|
|
|
|
const vector unsigned int sl1 = ALTI_SL1;
|
|
const vector unsigned int sr1 = ALTI_SR1;
|
|
#ifdef ONLY64
|
|
const vector unsigned int mask = ALTI_MSK64;
|
|
const vector unsigned char perm_sl = ALTI_SL2_PERM64;
|
|
const vector unsigned char perm_sr = ALTI_SR2_PERM64;
|
|
#else
|
|
const vector unsigned int mask = ALTI_MSK;
|
|
const vector unsigned char perm_sl = ALTI_SL2_PERM;
|
|
const vector unsigned char perm_sr = ALTI_SR2_PERM;
|
|
#endif
|
|
vector unsigned int v, w, x, y, z;
|
|
x = vec_perm(a, (vector unsigned int)perm_sl, perm_sl);
|
|
v = a;
|
|
y = vec_sr(b, sr1);
|
|
z = vec_perm(c, (vector unsigned int)perm_sr, perm_sr);
|
|
w = vec_sl(d, sl1);
|
|
z = vec_xor(z, w);
|
|
y = vec_and(y, mask);
|
|
v = vec_xor(v, x);
|
|
z = vec_xor(z, y);
|
|
z = vec_xor(z, v);
|
|
return z;
|
|
}
|
|
|
|
/**
|
|
* This function fills the internal state array with pseudorandom
|
|
* integers.
|
|
*/
|
|
inline static void gen_rand_all(void) {
|
|
int i;
|
|
vector unsigned int r, r1, r2;
|
|
|
|
r1 = sfmt[N - 2].s;
|
|
r2 = sfmt[N - 1].s;
|
|
for (i = 0; i < N - POS1; i++) {
|
|
r = vec_recursion(sfmt[i].s, sfmt[i + POS1].s, r1, r2);
|
|
sfmt[i].s = r;
|
|
r1 = r2;
|
|
r2 = r;
|
|
}
|
|
for (; i < N; i++) {
|
|
r = vec_recursion(sfmt[i].s, sfmt[i + POS1 - N].s, r1, r2);
|
|
sfmt[i].s = r;
|
|
r1 = r2;
|
|
r2 = r;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This function fills the user-specified array with pseudorandom
|
|
* integers.
|
|
*
|
|
* @param array an 128-bit array to be filled by pseudorandom numbers.
|
|
* @param size number of 128-bit pesudorandom numbers to be generated.
|
|
*/
|
|
inline static void gen_rand_array(w128_t *array, int size) {
|
|
int i, j;
|
|
vector unsigned int r, r1, r2;
|
|
|
|
r1 = sfmt[N - 2].s;
|
|
r2 = sfmt[N - 1].s;
|
|
for (i = 0; i < N - POS1; i++) {
|
|
r = vec_recursion(sfmt[i].s, sfmt[i + POS1].s, r1, r2);
|
|
array[i].s = r;
|
|
r1 = r2;
|
|
r2 = r;
|
|
}
|
|
for (; i < N; i++) {
|
|
r = vec_recursion(sfmt[i].s, array[i + POS1 - N].s, r1, r2);
|
|
array[i].s = r;
|
|
r1 = r2;
|
|
r2 = r;
|
|
}
|
|
/* main loop */
|
|
for (; i < size - N; i++) {
|
|
r = vec_recursion(array[i - N].s, array[i + POS1 - N].s, r1, r2);
|
|
array[i].s = r;
|
|
r1 = r2;
|
|
r2 = r;
|
|
}
|
|
for (j = 0; j < 2 * N - size; j++) {
|
|
sfmt[j].s = array[j + size - N].s;
|
|
}
|
|
for (; i < size; i++) {
|
|
r = vec_recursion(array[i - N].s, array[i + POS1 - N].s, r1, r2);
|
|
array[i].s = r;
|
|
sfmt[j++].s = r;
|
|
r1 = r2;
|
|
r2 = r;
|
|
}
|
|
}
|
|
|
|
#ifndef ONLY64
|
|
#if defined(__APPLE__)
|
|
#define ALTI_SWAP (vector unsigned char) \
|
|
(4, 5, 6, 7, 0, 1, 2, 3, 12, 13, 14, 15, 8, 9, 10, 11)
|
|
#else
|
|
#define ALTI_SWAP {4, 5, 6, 7, 0, 1, 2, 3, 12, 13, 14, 15, 8, 9, 10, 11}
|
|
#endif
|
|
/**
|
|
* This function swaps high and low 32-bit of 64-bit integers in user
|
|
* specified array.
|
|
*
|
|
* @param array an 128-bit array to be swaped.
|
|
* @param size size of 128-bit array.
|
|
*/
|
|
inline static void swap(w128_t *array, int size) {
|
|
int i;
|
|
const vector unsigned char perm = ALTI_SWAP;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
array[i].s = vec_perm(array[i].s, (vector unsigned int)perm, perm);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#endif
|