SphinxBase 0.6
genrand.c
1/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
2/* ====================================================================
3 * Copyright (c) 1999-2004 Carnegie Mellon University. All rights
4 * reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * This work was supported in part by funding from the Defense Advanced
19 * Research Projects Agency and the National Science Foundation of the
20 * United States of America, and the CMU Sphinx Speech Consortium.
21 *
22 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
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36 */
37/*
38 A C-program for MT19937, with initialization improved 2002/1/26.
39 Coded by Takuji Nishimura and Makoto Matsumoto.
40
41 Before using, initialize the state by using init_genrand(seed)
42 or init_by_array(init_key, key_length).
43
44 Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
45 All rights reserved.
46
47 Redistribution and use in source and binary forms, with or without
48 modification, are permitted provided that the following conditions
49 are met:
50
51 1. Redistributions of source code must retain the above copyright
52 notice, this list of conditions and the following disclaimer.
53
54 2. Redistributions in binary form must reproduce the above copyright
55` notice, this list of conditions and the following disclaimer in the
56 documentation and/or other materials provided with the distribution.
57
58 3. The names of its contributors may not be used to endorse or promote
59 products derived from this software without specific prior written
60 permission.
61
62 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
63 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
64 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
65 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
66 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
67 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
68 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
69 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
70 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
71 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
72 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
73
74
75 Any feedback is very welcome.
76 http://www.math.keio.ac.jp/matumoto/emt.html
77 email: matumoto@math.keio.ac.jp
78*/
79
80
81/*
82 * randgen.c : a portable random generator
83 *
84 *
85 * **********************************************
86 * CMU ARPA Speech Project
87 *
88 * Copyright (c) 1999 Carnegie Mellon University.
89 * ALL RIGHTS RESERVED.
90 * **********************************************
91 *
92 * HISTORY
93 * $Log: genrand.c,v $
94 * Revision 1.2 2005/06/22 03:01:50 arthchan2003
95 * Added keyword
96 *
97 * Revision 1.3 2005/03/30 01:22:48 archan
98 * Fixed mistakes in last updates. Add
99 *
100 *
101 * 18-Nov-04 ARCHAN (archan@cs.cmu.edu) at Carnegie Mellon University
102 * First incorporated from the Mersenne Twister Random
103 * Number Generator package. It was chosen because it is
104 * in BSD-license and its performance is quite
105 * reasonable. Of course if you look at the inventors's
106 * page. This random generator can actually gives
107 * 19937-bits period. This is already far from we need.
108 * This will possibly good enough for the next 10 years.
109 *
110 * I also downgrade the code a little bit to avoid Sphinx's
111 * developers misused it.
112 */
113
114
115
116#include <stdio.h>
117
118#include "sphinxbase/genrand.h"
119
120/* Period parameters */
121#define N 624
122#define M 397
123#define MATRIX_A 0x9908b0dfUL /* constant vector a */
124#define UPPER_MASK 0x80000000UL /* most significant w-r bits */
125#define LOWER_MASK 0x7fffffffUL /* least significant r bits */
126
127void init_genrand(unsigned long s);
128
129void
130genrand_seed(unsigned long s)
131{
132 init_genrand(s);
133}
134
135
136static unsigned long mt[N]; /* the array for the state vector */
137static int mti = N + 1; /* mti==N+1 means mt[N] is not initialized */
138
139/* initializes mt[N] with a seed */
140void
141init_genrand(unsigned long s)
142{
143 mt[0] = s & 0xffffffffUL;
144 for (mti = 1; mti < N; mti++) {
145 mt[mti] =
146 (1812433253UL * (mt[mti - 1] ^ (mt[mti - 1] >> 30)) + mti);
147 /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
148 /* In the previous versions, MSBs of the seed affect */
149 /* only MSBs of the array mt[]. */
150 /* 2002/01/09 modified by Makoto Matsumoto */
151 mt[mti] &= 0xffffffffUL;
152 /* for >32 bit machines */
153 }
154}
155
156/* generates a random number on [0,0xffffffff]-interval */
157unsigned long
158genrand_int32(void)
159{
160 unsigned long y;
161 static unsigned long mag01[2] = { 0x0UL, MATRIX_A };
162 /* mag01[x] = x * MATRIX_A for x=0,1 */
163
164 if (mti >= N) { /* generate N words at one time */
165 int kk;
166
167 if (mti == N + 1) /* if init_genrand() has not been called, */
168 init_genrand(5489UL); /* a default initial seed is used */
169
170 for (kk = 0; kk < N - M; kk++) {
171 y = (mt[kk] & UPPER_MASK) | (mt[kk + 1] & LOWER_MASK);
172 mt[kk] = mt[kk + M] ^ (y >> 1) ^ mag01[y & 0x1UL];
173 }
174 for (; kk < N - 1; kk++) {
175 y = (mt[kk] & UPPER_MASK) | (mt[kk + 1] & LOWER_MASK);
176 mt[kk] = mt[kk + (M - N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
177 }
178 y = (mt[N - 1] & UPPER_MASK) | (mt[0] & LOWER_MASK);
179 mt[N - 1] = mt[M - 1] ^ (y >> 1) ^ mag01[y & 0x1UL];
180
181 mti = 0;
182 }
183
184 y = mt[mti++];
185
186 /* Tempering */
187 y ^= (y >> 11);
188 y ^= (y << 7) & 0x9d2c5680UL;
189 y ^= (y << 15) & 0xefc60000UL;
190 y ^= (y >> 18);
191
192 return y;
193}
194
195/* generates a random number on [0,0x7fffffff]-interval */
196long
198{
199 return (long) (genrand_int32() >> 1);
200}
201
202/* generates a random number on [0,1]-real-interval */
203double
204genrand_real1(void)
205{
206 return genrand_int32() * (1.0 / 4294967295.0);
207 /* divided by 2^32-1 */
208}
209
210/* generates a random number on [0,1)-real-interval */
211double
212genrand_real2(void)
213{
214 return genrand_int32() * (1.0 / 4294967296.0);
215 /* divided by 2^32 */
216}
217
218/* generates a random number on (0,1)-real-interval */
219double
221{
222 return (((double) genrand_int32()) + 0.5) * (1.0 / 4294967296.0);
223 /* divided by 2^32 */
224}
225
226/* generates a random number on [0,1) with 53-bit resolution*/
227double
229{
230 unsigned long a = genrand_int32() >> 5, b = genrand_int32() >> 6;
231 return (a * 67108864.0 + b) * (1.0 / 9007199254740992.0);
232}
233
234/* These real versions are due to Isaku Wada, 2002/01/09 added */
High performance prortable random generator created by Takuji Nishimura and Makoto Matsumoto.
SPHINXBASE_EXPORT long genrand_int31(void)
generates a random number on [0,0x7fffffff]-interval
Definition genrand.c:197
SPHINXBASE_EXPORT void genrand_seed(unsigned long s)
Initialize the seed of the random generator.
Definition genrand.c:130
SPHINXBASE_EXPORT double genrand_res53(void)
generates a random number on [0,1) with 53-bit resolution
Definition genrand.c:228
SPHINXBASE_EXPORT double genrand_real3(void)
generates a random number on (0,1)-real-interval
Definition genrand.c:220