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/* rng/tt.c
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 James Theiler, Brian Gough
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <gsl/gsl_rng.h>
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/* This is the TT800 twisted GSFR generator for 32 bit integers. It
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has been superceded by MT19937 (mt.c). The period is 2^800.
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This implementation is based on tt800.c, July 8th 1996 version by
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M. Matsumoto, email: matumoto@math.keio.ac.jp
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From: Makoto Matsumoto and Yoshiharu Kurita, "Twisted GFSR
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Generators II", ACM Transactions on Modelling and Computer
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Simulation, Vol. 4, No. 3, 1994, pages 254-266. */
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static inline unsigned long int tt_get (void *vstate);
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static double tt_get_double (void *vstate);
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static void tt_set (void *state, unsigned long int s);
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#define N 25
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#define M 7
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typedef struct
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{
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int n;
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unsigned long int x[N];
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}
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tt_state_t;
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static inline unsigned long int
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tt_get (void *vstate)
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{
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tt_state_t *state = (tt_state_t *) vstate;
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/* this is the magic vector, a */
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const unsigned long mag01[2] =
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{0x00000000, 0x8ebfd028UL};
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unsigned long int y;
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unsigned long int *const x = state->x;
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int n = state->n;
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if (n >= N)
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{
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int i;
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for (i = 0; i < N - M; i++)
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{
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x[i] = x[i + M] ^ (x[i] >> 1) ^ mag01[x[i] % 2];
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}
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for (; i < N; i++)
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{
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x[i] = x[i + (M - N)] ^ (x[i] >> 1) ^ mag01[x[i] % 2];
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};
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n = 0;
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}
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y = x[n];
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y ^= (y << 7) & 0x2b5b2500UL; /* s and b, magic vectors */
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y ^= (y << 15) & 0xdb8b0000UL; /* t and c, magic vectors */
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y &= 0xffffffffUL; /* you may delete this line if word size = 32 */
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/* The following line was added by Makoto Matsumoto in the 1996
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version to improve lower bit's correlation. Delete this line
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to use the code published in 1994. */
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y ^= (y >> 16); /* added to the 1994 version */
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state->n = n + 1;
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return y;
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}
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static double
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tt_get_double (void * vstate)
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{
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return tt_get (vstate) / 4294967296.0 ;
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}
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static void
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tt_set (void *vstate, unsigned long int s)
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{
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tt_state_t *state = (tt_state_t *) vstate;
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const tt_state_t init_state =
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{0,
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{0x95f24dabUL, 0x0b685215UL, 0xe76ccae7UL,
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0xaf3ec239UL, 0x715fad23UL, 0x24a590adUL,
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0x69e4b5efUL, 0xbf456141UL, 0x96bc1b7bUL,
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0xa7bdf825UL, 0xc1de75b7UL, 0x8858a9c9UL,
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0x2da87693UL, 0xb657f9ddUL, 0xffdc8a9fUL,
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0x8121da71UL, 0x8b823ecbUL, 0x885d05f5UL,
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0x4e20cd47UL, 0x5a9ad5d9UL, 0x512c0c03UL,
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0xea857ccdUL, 0x4cc1d30fUL, 0x8891a8a1UL,
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0xa6b7aadbUL}};
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if (s == 0) /* default seed is given explicitly in the original code */
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{
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*state = init_state;
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}
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else
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{
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int i;
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state->n = 0;
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state->x[0] = s & 0xffffffffUL;
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for (i = 1; i < N; i++)
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state->x[i] = (69069 * state->x[i - 1]) & 0xffffffffUL;
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}
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return;
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}
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static const gsl_rng_type tt_type =
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{"tt800", /* name */
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0xffffffffUL, /* RAND_MAX */
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0, /* RAND_MIN */
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sizeof (tt_state_t),
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&tt_set,
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&tt_get,
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&tt_get_double};
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const gsl_rng_type *gsl_rng_tt800 = &tt_type;
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