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magicmoves.cpp
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magicmoves.cpp
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/**
*Copyright (C) 2007 Pradyumna Kannan.
*
*This code is provided 'as-is', without any expressed or implied warranty.
*In no event will the authors be held liable for any damages arising from
*the use of this code. Permission is granted to anyone to use this
*code for any purpose, including commercial applications, and to alter
*it and redistribute it freely, subject to the following restrictions:
*
*1. The origin of this code must not be misrepresented; you must not
*claim that you wrote the original code. If you use this code in a
*product, an acknowledgment in the product documentation would be
*appreciated but is not required.
*
*2. Altered source versions must be plainly marked as such, and must not be
*misrepresented as being the original code.
*
*3. This notice may not be removed or altered from any source distribution.
*/
#include "magicmoves.hpp"
#include "bitboard.h"
// altered source
U64 magicmovesbdb[5248];
const U64 *magicmoves_b_indices[64] = {
magicmovesbdb + 4992, magicmovesbdb + 2624, magicmovesbdb + 256, magicmovesbdb + 896,
magicmovesbdb + 1280, magicmovesbdb + 1664, magicmovesbdb + 4800, magicmovesbdb + 5120,
magicmovesbdb + 2560, magicmovesbdb + 2656, magicmovesbdb + 288, magicmovesbdb + 928,
magicmovesbdb + 1312, magicmovesbdb + 1696, magicmovesbdb + 4832, magicmovesbdb + 4928,
magicmovesbdb + 0, magicmovesbdb + 128, magicmovesbdb + 320, magicmovesbdb + 960,
magicmovesbdb + 1344, magicmovesbdb + 1728, magicmovesbdb + 2304, magicmovesbdb + 2432,
magicmovesbdb + 32, magicmovesbdb + 160, magicmovesbdb + 448, magicmovesbdb + 2752,
magicmovesbdb + 3776, magicmovesbdb + 1856, magicmovesbdb + 2336, magicmovesbdb + 2464,
magicmovesbdb + 64, magicmovesbdb + 192, magicmovesbdb + 576, magicmovesbdb + 3264,
magicmovesbdb + 4288, magicmovesbdb + 1984, magicmovesbdb + 2368, magicmovesbdb + 2496,
magicmovesbdb + 96, magicmovesbdb + 224, magicmovesbdb + 704, magicmovesbdb + 1088,
magicmovesbdb + 1472, magicmovesbdb + 2112, magicmovesbdb + 2400, magicmovesbdb + 2528,
magicmovesbdb + 2592, magicmovesbdb + 2688, magicmovesbdb + 832, magicmovesbdb + 1216,
magicmovesbdb + 1600, magicmovesbdb + 2240, magicmovesbdb + 4864, magicmovesbdb + 4960,
magicmovesbdb + 5056, magicmovesbdb + 2720, magicmovesbdb + 864, magicmovesbdb + 1248,
magicmovesbdb + 1632, magicmovesbdb + 2272, magicmovesbdb + 4896, magicmovesbdb + 5184
};
U64 magicmovesrdb[102400];
const U64 *magicmoves_r_indices[64] = {
magicmovesrdb + 86016, magicmovesrdb + 73728, magicmovesrdb + 36864, magicmovesrdb + 43008,
magicmovesrdb + 47104, magicmovesrdb + 51200, magicmovesrdb + 77824, magicmovesrdb + 94208,
magicmovesrdb + 69632, magicmovesrdb + 32768, magicmovesrdb + 38912, magicmovesrdb + 10240,
magicmovesrdb + 14336, magicmovesrdb + 53248, magicmovesrdb + 57344, magicmovesrdb + 81920,
magicmovesrdb + 24576, magicmovesrdb + 33792, magicmovesrdb + 6144, magicmovesrdb + 11264,
magicmovesrdb + 15360, magicmovesrdb + 18432, magicmovesrdb + 58368, magicmovesrdb + 61440,
magicmovesrdb + 26624, magicmovesrdb + 4096, magicmovesrdb + 7168, magicmovesrdb + 0,
magicmovesrdb + 2048, magicmovesrdb + 19456, magicmovesrdb + 22528, magicmovesrdb + 63488,
magicmovesrdb + 28672, magicmovesrdb + 5120, magicmovesrdb + 8192, magicmovesrdb + 1024,
magicmovesrdb + 3072, magicmovesrdb + 20480, magicmovesrdb + 23552, magicmovesrdb + 65536,
magicmovesrdb + 30720, magicmovesrdb + 34816, magicmovesrdb + 9216, magicmovesrdb + 12288,
magicmovesrdb + 16384, magicmovesrdb + 21504, magicmovesrdb + 59392, magicmovesrdb + 67584,
magicmovesrdb + 71680, magicmovesrdb + 35840, magicmovesrdb + 39936, magicmovesrdb + 13312,
magicmovesrdb + 17408, magicmovesrdb + 54272, magicmovesrdb + 60416, magicmovesrdb + 83968,
magicmovesrdb + 90112, magicmovesrdb + 75776, magicmovesrdb + 40960, magicmovesrdb + 45056,
magicmovesrdb + 49152, magicmovesrdb + 55296, magicmovesrdb + 79872, magicmovesrdb + 98304
};
U64 initmagicmoves_occ(const int *squares, const int numSquares, const U64 linocc) {
int i;
U64 ret = 0;
for (i = 0; i < numSquares; i++)
if (linocc & (((U64)(1)) << i))
ret |= (((U64)(1)) << squares[i]);
return ret;
}
U64 initmagicmoves_Rmoves(const int square, const U64 occ) {
U64 ret = 0;
U64 bit;
U64 rowbits = (((U64)0xFF) << (8 * (square / 8)));
bit = (((U64)(1)) << square);
do {
bit <<= 8;
ret |= bit;
} while (bit && !(bit & occ));
bit = (((U64)(1)) << square);
do {
bit >>= 8;
ret |= bit;
} while (bit && !(bit & occ));
bit = (((U64)(1)) << square);
do {
bit <<= 1;
if (bit & rowbits)
ret |= bit;
else
break;
} while (!(bit & occ));
bit = (((U64)(1)) << square);
do {
bit >>= 1;
if (bit & rowbits)
ret |= bit;
else
break;
} while (!(bit & occ));
return ret;
}
U64 initmagicmoves_Bmoves(const int square, const U64 occ) {
U64 ret = 0;
U64 bit;
U64 bit2;
U64 rowbits = (((U64)0xFF) << (8 * (square / 8)));
bit = (((U64)(1)) << square);
bit2 = bit;
do {
bit <<= 8 - 1;
bit2 >>= 1;
if (bit2 & rowbits)
ret |= bit;
else
break;
} while (bit && !(bit & occ));
bit = (((U64)(1)) << square);
bit2 = bit;
do {
bit <<= 8 + 1;
bit2 <<= 1;
if (bit2 & rowbits)
ret |= bit;
else
break;
} while (bit && !(bit & occ));
bit = (((U64)(1)) << square);
bit2 = bit;
do {
bit >>= 8 - 1;
bit2 <<= 1;
if (bit2 & rowbits)
ret |= bit;
else
break;
} while (bit && !(bit & occ));
bit = (((U64)(1)) << square);
bit2 = bit;
do {
bit >>= 8 + 1;
bit2 >>= 1;
if (bit2 & rowbits)
ret |= bit;
else
break;
} while (bit && !(bit & occ));
return ret;
}
#define BmagicNOMASK2(square, occupancy) *(magicmoves_b_indices2[square] + (((occupancy)*magicmoves_b_magics[square]) >> magicmoves_b_shift[square]))
#define RmagicNOMASK2(square, occupancy) *(magicmoves_r_indices2[square] + (((occupancy)*magicmoves_r_magics[square]) >> magicmoves_r_shift[square]))
void init_magics(void) {
int i;
U64 *magicmoves_b_indices2[64] = {
magicmovesbdb + 4992, magicmovesbdb + 2624, magicmovesbdb + 256, magicmovesbdb + 896,
magicmovesbdb + 1280, magicmovesbdb + 1664, magicmovesbdb + 4800, magicmovesbdb + 5120,
magicmovesbdb + 2560, magicmovesbdb + 2656, magicmovesbdb + 288, magicmovesbdb + 928,
magicmovesbdb + 1312, magicmovesbdb + 1696, magicmovesbdb + 4832, magicmovesbdb + 4928,
magicmovesbdb + 0, magicmovesbdb + 128, magicmovesbdb + 320, magicmovesbdb + 960,
magicmovesbdb + 1344, magicmovesbdb + 1728, magicmovesbdb + 2304, magicmovesbdb + 2432,
magicmovesbdb + 32, magicmovesbdb + 160, magicmovesbdb + 448, magicmovesbdb + 2752,
magicmovesbdb + 3776, magicmovesbdb + 1856, magicmovesbdb + 2336, magicmovesbdb + 2464,
magicmovesbdb + 64, magicmovesbdb + 192, magicmovesbdb + 576, magicmovesbdb + 3264,
magicmovesbdb + 4288, magicmovesbdb + 1984, magicmovesbdb + 2368, magicmovesbdb + 2496,
magicmovesbdb + 96, magicmovesbdb + 224, magicmovesbdb + 704, magicmovesbdb + 1088,
magicmovesbdb + 1472, magicmovesbdb + 2112, magicmovesbdb + 2400, magicmovesbdb + 2528,
magicmovesbdb + 2592, magicmovesbdb + 2688, magicmovesbdb + 832, magicmovesbdb + 1216,
magicmovesbdb + 1600, magicmovesbdb + 2240, magicmovesbdb + 4864, magicmovesbdb + 4960,
magicmovesbdb + 5056, magicmovesbdb + 2720, magicmovesbdb + 864, magicmovesbdb + 1248,
magicmovesbdb + 1632, magicmovesbdb + 2272, magicmovesbdb + 4896, magicmovesbdb + 5184
};
U64 *magicmoves_r_indices2[64]{
magicmovesrdb + 86016, magicmovesrdb + 73728, magicmovesrdb + 36864, magicmovesrdb + 43008,
magicmovesrdb + 47104, magicmovesrdb + 51200, magicmovesrdb + 77824, magicmovesrdb + 94208,
magicmovesrdb + 69632, magicmovesrdb + 32768, magicmovesrdb + 38912, magicmovesrdb + 10240,
magicmovesrdb + 14336, magicmovesrdb + 53248, magicmovesrdb + 57344, magicmovesrdb + 81920,
magicmovesrdb + 24576, magicmovesrdb + 33792, magicmovesrdb + 6144, magicmovesrdb + 11264,
magicmovesrdb + 15360, magicmovesrdb + 18432, magicmovesrdb + 58368, magicmovesrdb + 61440,
magicmovesrdb + 26624, magicmovesrdb + 4096, magicmovesrdb + 7168, magicmovesrdb + 0,
magicmovesrdb + 2048, magicmovesrdb + 19456, magicmovesrdb + 22528, magicmovesrdb + 63488,
magicmovesrdb + 28672, magicmovesrdb + 5120, magicmovesrdb + 8192, magicmovesrdb + 1024,
magicmovesrdb + 3072, magicmovesrdb + 20480, magicmovesrdb + 23552, magicmovesrdb + 65536,
magicmovesrdb + 30720, magicmovesrdb + 34816, magicmovesrdb + 9216, magicmovesrdb + 12288,
magicmovesrdb + 16384, magicmovesrdb + 21504, magicmovesrdb + 59392, magicmovesrdb + 67584,
magicmovesrdb + 71680, magicmovesrdb + 35840, magicmovesrdb + 39936, magicmovesrdb + 13312,
magicmovesrdb + 17408, magicmovesrdb + 54272, magicmovesrdb + 60416, magicmovesrdb + 83968,
magicmovesrdb + 90112, magicmovesrdb + 75776, magicmovesrdb + 40960, magicmovesrdb + 45056,
magicmovesrdb + 49152, magicmovesrdb + 55296, magicmovesrdb + 79872, magicmovesrdb + 98304
};
for (i = 0; i < 64; i++) {
int squares[64];
int numsquares = 0;
uint64_t temp = magicmoves_b_mask[i];
while (temp) {
Square sq = pop_lsb(temp);
squares[numsquares++] = sq;
}
for (temp = 0; temp < (((U64)(1)) << numsquares); temp++) {
U64 tempocc = initmagicmoves_occ(squares, numsquares, temp);
BmagicNOMASK2(i, tempocc) = initmagicmoves_Bmoves(i, tempocc);
}
}
for (i = 0; i < 64; i++) {
int squares[64];
int numsquares = 0;
uint64_t temp = magicmoves_r_mask[i];
while (temp) {
Square sq = pop_lsb(temp);
squares[numsquares++] = sq;
}
for (temp = 0; temp < (((U64)(1)) << numsquares); temp++) {
U64 tempocc = initmagicmoves_occ(squares, numsquares, temp);
RmagicNOMASK2(i, tempocc) = initmagicmoves_Rmoves(i, tempocc);
}
}
}
void initMagics() {
init_magics();
}