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authornobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2019-02-07 08:53:12 +0000
committernobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2019-02-07 08:53:12 +0000
commit18365f9e83ef8f8402426024de4777f1f831ba37 (patch)
treec4b1bdaafccc5d21ecd92e0e2b1c540a7e61c55d /random.c
parent867338c36ea8094b6c45ed3e081315c654fd3617 (diff)
Split mt19937.c
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67023 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'random.c')
-rw-r--r--random.c159
1 files changed, 1 insertions, 158 deletions
diff --git a/random.c b/random.c
index 38dfaeb..77a8fc7 100644
--- a/random.c
+++ b/random.c
@@ -9,56 +9,6 @@
**********************************************************************/
-/*
-This is based on trimmed version of MT19937. To get the original version,
-contact <http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html>.
-
-The original copyright notice follows.
-
- A C-program for MT19937, with initialization improved 2002/2/10.
- Coded by Takuji Nishimura and Makoto Matsumoto.
- This is a faster version by taking Shawn Cokus's optimization,
- Matthe Bellew's simplification, Isaku Wada's real version.
-
- Before using, initialize the state by using init_genrand(mt, seed)
- or init_by_array(mt, init_key, key_length).
-
- Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
-
- 2. Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
-
- 3. The names of its contributors may not be used to endorse or promote
- products derived from this software without specific prior written
- permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
- Any feedback is very welcome.
- http://www.math.keio.ac.jp/matumoto/emt.html
- email: matumoto@math.keio.ac.jp
-*/
-
#include "internal.h"
#include <limits.h>
@@ -96,114 +46,7 @@ The original copyright notice follows.
typedef int int_must_be_32bit_at_least[sizeof(int) * CHAR_BIT < 32 ? -1 : 1];
-/* Period parameters */
-#define N 624
-#define M 397
-#define MATRIX_A 0x9908b0dfU /* constant vector a */
-#define UMASK 0x80000000U /* most significant w-r bits */
-#define LMASK 0x7fffffffU /* least significant r bits */
-#define MIXBITS(u,v) ( ((u) & UMASK) | ((v) & LMASK) )
-#define TWIST(u,v) ((MIXBITS((u),(v)) >> 1) ^ ((v)&1U ? MATRIX_A : 0U))
-
-enum {MT_MAX_STATE = N};
-
-struct MT {
- /* assume int is enough to store 32bits */
- uint32_t state[N]; /* the array for the state vector */
- uint32_t *next;
- int left;
-};
-
-#define genrand_initialized(mt) ((mt)->next != 0)
-#define uninit_genrand(mt) ((mt)->next = 0)
-
-NO_SANITIZE("unsigned-integer-overflow", static void init_genrand(struct MT *mt, unsigned int s));
-NO_SANITIZE("unsigned-integer-overflow", static void init_by_array(struct MT *mt, const uint32_t init_key[], int key_length));
-
-/* initializes state[N] with a seed */
-static void
-init_genrand(struct MT *mt, unsigned int s)
-{
- int j;
- mt->state[0] = s & 0xffffffffU;
- for (j=1; j<N; j++) {
- mt->state[j] = (1812433253U * (mt->state[j-1] ^ (mt->state[j-1] >> 30)) + j);
- /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
- /* In the previous versions, MSBs of the seed affect */
- /* only MSBs of the array state[]. */
- /* 2002/01/09 modified by Makoto Matsumoto */
- mt->state[j] &= 0xffffffff; /* for >32 bit machines */
- }
- mt->left = 1;
- mt->next = mt->state + N;
-}
-
-/* initialize by an array with array-length */
-/* init_key is the array for initializing keys */
-/* key_length is its length */
-/* slight change for C++, 2004/2/26 */
-static void
-init_by_array(struct MT *mt, const uint32_t init_key[], int key_length)
-{
- int i, j, k;
- init_genrand(mt, 19650218U);
- i=1; j=0;
- k = (N>key_length ? N : key_length);
- for (; k; k--) {
- mt->state[i] = (mt->state[i] ^ ((mt->state[i-1] ^ (mt->state[i-1] >> 30)) * 1664525U))
- + init_key[j] + j; /* non linear */
- mt->state[i] &= 0xffffffffU; /* for WORDSIZE > 32 machines */
- i++; j++;
- if (i>=N) { mt->state[0] = mt->state[N-1]; i=1; }
- if (j>=key_length) j=0;
- }
- for (k=N-1; k; k--) {
- mt->state[i] = (mt->state[i] ^ ((mt->state[i-1] ^ (mt->state[i-1] >> 30)) * 1566083941U))
- - i; /* non linear */
- mt->state[i] &= 0xffffffffU; /* for WORDSIZE > 32 machines */
- i++;
- if (i>=N) { mt->state[0] = mt->state[N-1]; i=1; }
- }
-
- mt->state[0] = 0x80000000U; /* MSB is 1; assuring non-zero initial array */
-}
-
-static void
-next_state(struct MT *mt)
-{
- uint32_t *p = mt->state;
- int j;
-
- mt->left = N;
- mt->next = mt->state;
-
- for (j=N-M+1; --j; p++)
- *p = p[M] ^ TWIST(p[0], p[1]);
-
- for (j=M; --j; p++)
- *p = p[M-N] ^ TWIST(p[0], p[1]);
-
- *p = p[M-N] ^ TWIST(p[0], mt->state[0]);
-}
-
-/* generates a random number on [0,0xffffffff]-interval */
-static unsigned int
-genrand_int32(struct MT *mt)
-{
- /* mt must be initialized */
- unsigned int y;
-
- if (--mt->left <= 0) next_state(mt);
- y = *mt->next++;
-
- /* Tempering */
- y ^= (y >> 11);
- y ^= (y << 7) & 0x9d2c5680;
- y ^= (y << 15) & 0xefc60000;
- y ^= (y >> 18);
-
- return y;
-}
+#include "missing/mt19937.c"
/* generates a random number on [0,1) with 53-bit resolution*/
static double int_pair_to_real_exclusive(uint32_t a, uint32_t b);