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Use Heinz's RKiss instead of marsenne

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-11-07 11:13:17 +01:00
parent 287556f97d
commit f5e28ef512
7 changed files with 95 additions and 226 deletions
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6
src/application.cpp
View file

@ -27,7 +27,6 @@
#include "endgame.h"
#include "evaluate.h"
#include "material.h"
#include "mersenne.h"
#include "misc.h"
#include "movepick.h"
#include "position.h"
@ -41,7 +40,6 @@
Application::Application() {
init_mersenne();
init_direction_table();
init_bitboards();
init_uci_options();
@ -51,10 +49,6 @@ Application::Application() {
init_bitbases();
init_search();
init_threads();
// Make random number generation less deterministic, for book moves
for (int i = abs(get_system_time() % 10000); i > 0; i--)
genrand_int32();
}
void Application::initialize() {

10
src/book.cpp
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@ -32,7 +32,6 @@
#include <cassert>
#include "book.h"
#include "mersenne.h"
#include "movegen.h"
using namespace std;
@ -343,6 +342,13 @@ namespace {
//// Functions
////
// C'tor. Make random number generation less deterministic, for book moves
Book::Book() {
for (int i = abs(get_system_time() % 10000); i > 0; i--)
RKiss.rand32();
}
/// Destructor. Be sure file is closed before we leave.
@ -435,7 +441,7 @@ Move Book::get_move(const Position& pos, bool findBestMove) {
// high score it has more probability to be choosen then a one with
// lower score. Note that first entry is always chosen.
scoresSum += score;
if (int(genrand_int32() % scoresSum) < score)
if (int(RKiss.rand32() % scoresSum) < score)
bookMove = entry.move;
}
if (!bookMove)

4
src/book.h
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@ -38,6 +38,7 @@
#include "move.h"
#include "position.h"
#include "rkiss.h"
////
@ -56,7 +57,7 @@ class Book : private std::ifstream {
Book(const Book&); // just decleared..
Book& operator=(const Book&); // ..to avoid a warning
public:
Book() {}
Book();
~Book();
void open(const std::string& fName);
void close();
@ -74,6 +75,7 @@ private:
std::string fileName;
int bookSize;
RKISS RKiss;
};

171
src/mersenne.cpp
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@ -1,171 +0,0 @@
/*
A C-program for MT19937, with initialization improved 2002/1/26.
Coded by Takuji Nishimura and Makoto Matsumoto.
Before using, initialize the state by using init_genrand(seed)
or init_by_array(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.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
*/
#include "mersenne.h"
namespace {
// Period parameters
const int N = 624;
const int M = 397;
const unsigned long MATRIX_A = 0x9908b0dfUL; // Constant vector a
const unsigned long UPPER_MASK = 0x80000000UL; // Most significant w-r bits
const unsigned long LOWER_MASK = 0x7fffffffUL; // Least significant r bits
unsigned long mt[N]; // The array for the state vector
int mti = N + 1; // mti == N+1 means mt[N] is not initialized
// Initializes mt[N] with a seed
void init_genrand(unsigned long s) {
mt[0]= s & 0xffffffffUL;
for (mti = 1; mti < N; mti++)
{
// See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier.
// In the previous versions, MSBs of the seed affect
// only MSBs of the array mt[].
// 2002/01/09 modified by Makoto Matsumoto
mt[mti] = 1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti;
mt[mti] &= 0xffffffffUL; // For > 32 bit machines
}
}
// 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
void init_by_array(unsigned long init_key[], int key_length) {
int i = 1;
int j = 0;
int k = (N > key_length ? N : key_length);
init_genrand(19650218UL);
for ( ; k; k--)
{
mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1664525UL)) + init_key[j] + j; // Non linear
mt[i] &= 0xffffffffUL; // For WORDSIZE > 32 machines
i++; j++;
if (i >= N)
{
mt[0] = mt[N-1];
i = 1;
}
if (j >= key_length)
j = 0;
}
for (k = N-1; k; k--)
{
mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1566083941UL)) - i; // Non linear
mt[i] &= 0xffffffffUL; // For WORDSIZE > 32 machines
i++;
if (i >= N)
{
mt[0] = mt[N-1];
i = 1;
}
}
mt[0] = 0x80000000UL; // MSB is 1; assuring non-zero initial array
}
} // namespace
// Generates a random number on [0,0xffffffff]-interval
uint32_t genrand_int32() {
unsigned long y;
static unsigned long mag01[2] = {0x0UL, MATRIX_A};
/* mag01[x] = x * MATRIX_A for x=0,1 */
// Generate N words at one time
if (mti >= N)
{
int kk;
if (mti == N+1) // If init_genrand() has not been called,
init_genrand(5489UL); // a default initial seed is used.
for (kk = 0; kk < N-M; kk++)
{
y = (mt[kk] & UPPER_MASK) | (mt[kk+1] & LOWER_MASK);
mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL];
}
for ( ; kk < N-1; kk++)
{
y = (mt[kk] & UPPER_MASK) | (mt[kk+1] & LOWER_MASK);
mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
}
y = (mt[N-1] & UPPER_MASK) | (mt[0] & LOWER_MASK);
mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL];
mti = 0;
}
y = mt[mti++];
// Tempering
y ^= (y >> 11);
y ^= (y << 7) & 0x9d2c5680UL;
y ^= (y << 15) & 0xefc60000UL;
y ^= (y >> 18);
return y;
}
uint64_t genrand_int64() {
uint64_t x, y;
x = genrand_int32();
y = genrand_int32();
return (x << 32) | y;
}
void init_mersenne() {
unsigned long init[4] = {0x123, 0x234, 0x345, 0x456};
unsigned long length = 4;
init_by_array(init, length);
}

40
src/mersenne.h
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@ -1,40 +0,0 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#if !defined(MERSENNE_H_INCLUDED)
#define MERSENNE_H_INCLUDED
////
//// Includes
////
#include "types.h"
////
//// Prototypes
////
extern uint32_t genrand_int32();
extern uint64_t genrand_int64();
extern void init_mersenne();
#endif // !defined(MERSENNE_H_INCLUDED)

13
src/position.cpp
View file

@ -31,11 +31,11 @@
#include <sstream>
#include "bitcount.h"
#include "mersenne.h"
#include "movegen.h"
#include "movepick.h"
#include "position.h"
#include "psqtab.h"
#include "rkiss.h"
#include "san.h"
#include "tt.h"
#include "ucioption.h"
@ -1759,19 +1759,20 @@ bool Position::has_mate_threat() {
void Position::init_zobrist() {
RKISS RKiss;
int i,j, k;
for (i = 0; i < 2; i++) for (j = 0; j < 8; j++) for (k = 0; k < 64; k++)
zobrist[i][j][k] = Key(genrand_int64());
zobrist[i][j][k] = Key(RKiss.rand64());
for (i = 0; i < 64; i++)
zobEp[i] = Key(genrand_int64());
zobEp[i] = Key(RKiss.rand64());
for (i = 0; i < 16; i++)
zobCastle[i] = Key(genrand_int64());
zobCastle[i] = Key(RKiss.rand64());
zobSideToMove = Key(genrand_int64());
zobExclusion = Key(genrand_int64());
zobSideToMove = Key(RKiss.rand64());
zobExclusion = Key(RKiss.rand64());
}

77
src/rkiss.h Normal file
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@ -0,0 +1,77 @@
/** *********************************************************************** **
** A small "keep it simple and stupid" RNG with some fancy merits:
**
** Quite platform independent
** Passes ALL dieharder tests! Here *nix sys-rand() e.g. fails miserably:-)
** ~12 times faster than my *nix sys-rand()
** ~4 times faster than SSE2-version of Mersenne twister
** Average cycle length: ~2^126
** 64 bit seed
** Return doubles with a full 53 bit mantissa
** Thread save
**
** (c) Heinz van Saanen
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
** *********************************************************************** **/
#ifndef _RKISS_H_
#define _RKISS_H_
/** Includes **/
#include <cstdlib> // srand(), rand()
#include <ctime> // time()
#include "types.h" // (u)int8_t .. (u)int64_t
/** Random class **/
class RKISS {
private:
// Keep variables always together
struct S { uint64_t a; uint64_t b; uint64_t c; uint64_t d; } s;
// Init seed and scramble a few rounds
void raninit ( uint64_t seed ) {
s.a = 0xf1ea5eed; s.b = s.c = s.d = seed;
for ( uint64_t i=0; i<8; i++ ) rand64();
}
public:
// Instance seed random or implicite
RKISS() { ::srand ( (uint32_t)time(NULL) ); raninit ( (uint64_t)::rand() ); }
// RKISS( uint64_t s ) { raninit ( s ); }
// (Re)init seed
// void init ( uint64_t seed ) { raninit ( seed ); }
// Return 32 bit unsigned integer in between [0,2^32-1]
uint32_t rand32 () { return (uint32_t) rand64 (); }
// Return 64 bit unsigned integer in between [0,2^64-1]
uint64_t rand64 () {
const uint64_t e = s.a - ((s.b<<7) | (s.b>>57));
s.a = s.b ^ ((s.c<<13) | (s.c>>51));
s.b = s.c + ((s.d<<37) | (s.d>>27));
s.c = s.d + e;
return s.d = e + s.a;
}
// Return double in between [0,1). Keep full 53 bit mantissa
// double frand () { return (int64_t)(rand64()>>11) * (1.0/(67108864.0*134217728.0)); }
};
// _RKISS_H_
#endif