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/*
A C-program for MT19937-64 (2004/9/29 version).
Coded by Takuji Nishimura and Makoto Matsumoto.
This is a 64-bit version of Mersenne Twister pseudorandom number
generator.
Copyright (C) 2004, 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.
References:
T. Nishimura, ``Tables of 64-bit Mersenne Twisters''
ACM Transactions on Modeling and
Computer Simulation 10. (2000) 348--357.
M. Matsumoto and T. Nishimura,
``Mersenne Twister: a 623-dimensionally equidistributed
uniform pseudorandom number generator''
ACM Transactions on Modeling and
Computer Simulation 8. (Jan. 1998) 3--30.
Any feedback is very welcome.
http://www.math.hiroshima-u.ac.jp/~m-mat/MT/emt.html
email: m-mat @ math.sci.hiroshima-u.ac.jp (remove spaces)
Modified by Don Stewart to use non-global state.
Modified by Bertram Felgenhauer to provide block oriented functions only.
*/
#include <stdio.h>
#include <stdlib.h>
#include "mt19937-64-block.h"
/*
* When passed an empty state, initialize the states' mt[NN] with a seed
*/
void seed_genrand64_block(mt_block st, unsigned long long seed)
{
int i;
st->mt[0] = seed;
for (i=1; i<NN; i++)
st->mt[i] = (6364136223846793005ULL *
(st->mt[i-1] ^ (st->mt[i-1] >> 62)) + i);
}
/* generates a new state buffer from the previous one */
void next_genrand64_block(mt_block st, mt_block newst)
{
int i;
unsigned long long x;
static unsigned long long mag01[2]={0ULL, MATRIX_A};
for (i=0; i<NN-MM; i++) {
x = (st->mt[i]&UM)|(st->mt[i+1]&LM);
newst->mt[i] = st->mt[i+MM] ^ (x>>1) ^ mag01[(int)(x&1ULL)];
}
for (; i<NN-1; i++) {
x = (st->mt[i]&UM)|(st->mt[i+1]&LM);
newst->mt[i] = newst->mt[i+(MM-NN)] ^ (x>>1) ^ mag01[(int)(x&1ULL)];
}
x = (st->mt[NN-1]&UM)|(newst->mt[0]&LM);
newst->mt[NN-1] = newst->mt[MM-1] ^ (x>>1) ^ mag01[(int)(x&1ULL)];
}
unsigned long long mix_bits(unsigned long long x)
{
x ^= (x >> 29) & 0x5555555555555555ULL;
x ^= (x << 17) & 0x71D67FFFEDA60000ULL;
x ^= (x << 37) & 0xFFF7EEE000000000ULL;
x ^= (x >> 43);
return x;
}
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