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365 lines
14 KiB
C++
365 lines
14 KiB
C++
/*
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Texel - A UCI chess engine.
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Copyright (C) 2012-2014 Peter Österlund, peterosterlund2@gmail.com
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* bitBoard.cpp
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*
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* Created on: Feb 25, 2012
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* Author: petero
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*/
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#include "bitBoard.hpp"
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#include "position.hpp"
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#include <cassert>
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#include <iostream>
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U64 BitBoard::kingAttacks[64];
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U64 BitBoard::knightAttacks[64];
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U64 BitBoard::wPawnAttacks[64];
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U64 BitBoard::bPawnAttacks[64];
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const U64 BitBoard::maskFile[8] = {
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0x0101010101010101ULL,
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0x0202020202020202ULL,
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0x0404040404040404ULL,
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0x0808080808080808ULL,
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0x1010101010101010ULL,
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0x2020202020202020ULL,
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0x4040404040404040ULL,
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0x8080808080808080ULL
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};
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U64 BitBoard::epMaskW[8];
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U64 BitBoard::epMaskB[8];
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const U64 BitBoard::maskRow1;
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const U64 BitBoard::maskRow2;
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const U64 BitBoard::maskRow3;
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const U64 BitBoard::maskRow4;
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const U64 BitBoard::maskRow5;
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const U64 BitBoard::maskRow6;
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const U64 BitBoard::maskRow7;
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const U64 BitBoard::maskRow8;
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const U64 BitBoard::maskRow1Row8;
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const U64 BitBoard::maskDarkSq;
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const U64 BitBoard::maskLightSq;
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const U64 BitBoard::maskCorners;
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U64* BitBoard::rTables[64];
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U64 BitBoard::rMasks[64];
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int BitBoard::rBits[64] = { 12, 11, 11, 11, 11, 11, 11, 12,
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11, 10, 10, 11, 10, 10, 10, 11,
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11, 10, 10, 10, 10, 10, 10, 11,
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11, 10, 10, 10, 10, 10, 10, 11,
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11, 10, 10, 10, 10, 10, 10, 11,
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11, 10, 10, 11, 10, 10, 10, 11,
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10, 9, 9, 9, 9, 9, 10, 10,
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11, 10, 10, 10, 10, 11, 10, 11 };
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const U64 BitBoard::rMagics[64] = {
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0x19a80065ff2bffffULL, 0x3fd80075ffebffffULL, 0x4010000df6f6fffeULL, 0x0050001faffaffffULL,
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0x0050028004ffffb0ULL, 0x7f600280089ffff1ULL, 0x7f5000b0029ffffcULL, 0x5b58004848a7fffaULL,
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0x002a90005547ffffULL, 0x000050007f13ffffULL, 0x007fa0006013ffffULL, 0x006a9005656fffffULL,
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0x007f600f600affffULL, 0x007ec007e6bfffe2ULL, 0x007ec003eebffffbULL, 0x0071d002382fffdaULL,
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0x009f803000e7fffaULL, 0x00680030008bffffULL, 0x00606060004f3ffcULL, 0x001a00600bff9ffdULL,
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0x000d006005ff9fffULL, 0x0001806003005fffULL, 0x00000300040bfffaULL, 0x000192500065ffeaULL,
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0x00fff112d0006800ULL, 0x007ff037d000c004ULL, 0x003fd062001a3ff8ULL, 0x00087000600e1ffcULL,
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0x000fff0100100804ULL, 0x0007ff0100080402ULL, 0x0003ffe0c0060003ULL, 0x0001ffd53000d300ULL,
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0x00fffd3000600061ULL, 0x007fff7f95900040ULL, 0x003fff8c00600060ULL, 0x001ffe2587a01860ULL,
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0x000fff3fbf40180cULL, 0x0007ffc73f400c06ULL, 0x0003ff86d2c01405ULL, 0x0001fffeaa700100ULL,
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0x00fffdfdd8005000ULL, 0x007fff80ebffb000ULL, 0x003fffdf603f6000ULL, 0x001fffe050405000ULL,
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0x000fff400700c00cULL, 0x0007ff6007bf600aULL, 0x0003ffeebffec005ULL, 0x0001fffdf3feb001ULL,
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0x00ffff39ff484a00ULL, 0x007fff3fff486300ULL, 0x003fff99ffac2e00ULL, 0x001fff31ff2a6a00ULL,
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0x000fff19ff15b600ULL, 0x0007fff5fff28600ULL, 0x0003fffddffbfee0ULL, 0x0001fff5f63c96a0ULL,
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0x00ffff5dff65cfb6ULL, 0x007fffbaffd1c5aeULL, 0x003fff71ff6cbceaULL, 0x001fffd9ffd4756eULL,
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0x000ffff5fff338e6ULL, 0x0007fffdfffe24f6ULL, 0x0003ffef27eebe74ULL, 0x0001ffff23ff605eULL
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};
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U64* BitBoard::bTables[64];
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U64 BitBoard::bMasks[64];
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const int BitBoard::bBits[64] = { 5, 4, 5, 5, 5, 5, 4, 5,
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4, 4, 5, 5, 5, 5, 4, 4,
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4, 4, 7, 7, 7, 7, 4, 4,
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5, 5, 7, 9, 9, 7, 5, 5,
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5, 5, 7, 9, 9, 7, 5, 5,
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4, 4, 7, 7, 7, 7, 4, 4,
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4, 4, 5, 5, 5, 5, 4, 4,
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5, 4, 5, 5, 5, 5, 4, 5 };
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const U64 BitBoard::bMagics[64] = {
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0x0006eff5367ff600ULL, 0x00345835ba77ff2bULL, 0x00145f68a3f5dab6ULL, 0x003a1863fb56f21dULL,
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0x0012eb6bfe9d93cdULL, 0x000d82827f3420d6ULL, 0x00074bcd9c7fec97ULL, 0x000034fe99f9ffffULL,
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0x0000746f8d6717f6ULL, 0x00003acb32e1a3f7ULL, 0x0000185daf1ffb8aULL, 0x00003a1867f17067ULL,
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0x0000038ee0ccf92eULL, 0x000002a2b7ff926eULL, 0x000006c9aa93ff14ULL, 0x00000399b5e5bf87ULL,
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0x00400f342c951ffcULL, 0x0020230579ed8ff0ULL, 0x007b008a0077dbfdULL, 0x001d00010c13fd46ULL,
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0x00040022031c1ffbULL, 0x000fa00fd1cbff79ULL, 0x000400a4bc9affdfULL, 0x000200085e9cffdaULL,
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0x002a14560a3dbfbdULL, 0x000a0a157b9eafd1ULL, 0x00060600fd002ffaULL, 0x004006000c009010ULL,
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0x001a002042008040ULL, 0x001a00600fd1ffc0ULL, 0x000d0ace50bf3f8dULL, 0x000183a48434efd1ULL,
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0x001fbd7670982a0dULL, 0x000fe24301d81a0fULL, 0x0007fbf82f040041ULL, 0x000040c800008200ULL,
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0x007fe17018086006ULL, 0x003b7ddf0ffe1effULL, 0x001f92f861df4a0aULL, 0x000fd713ad98a289ULL,
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0x000fd6aa751e400cULL, 0x0007f2a63ae9600cULL, 0x0003ff7dfe0e3f00ULL, 0x000003fd2704ce04ULL,
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0x00007fc421601d40ULL, 0x007fff5f70900120ULL, 0x003fa66283556403ULL, 0x001fe31969aec201ULL,
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0x0007fdfc18ac14bbULL, 0x0003fb96fb568a47ULL, 0x000003f72ea4954dULL, 0x00000003f8dc0383ULL,
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0x0000007f3a814490ULL, 0x00007dc5c9cf62a6ULL, 0x007f23d3342897acULL, 0x003fee36eee1565cULL,
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0x0003ff3e99fcccc7ULL, 0x000003ecfcfac5feULL, 0x00000003f97f7453ULL, 0x0000000003f8dc03ULL,
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0x000000007efa8146ULL, 0x0000007ed3e2ef60ULL, 0x00007f47243adcd6ULL, 0x007fb65afabfb3b5ULL
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};
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std::vector<U64> BitBoard::tableData;
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const S8 BitBoard::dirTable[] = {
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-9, 0, 0, 0, 0, 0, 0, -8, 0, 0, 0, 0, 0, 0, -7,
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0, 0, -9, 0, 0, 0, 0, 0, -8, 0, 0, 0, 0, 0, -7, 0,
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0, 0, 0, -9, 0, 0, 0, 0, -8, 0, 0, 0, 0, -7, 0, 0,
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0, 0, 0, 0, -9, 0, 0, 0, -8, 0, 0, 0, -7, 0, 0, 0,
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0, 0, 0, 0, 0, -9, 0, 0, -8, 0, 0, -7, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, -9,-17, -8,-15, -7, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0,-10, -9, -8, -7, -6, 0, 0, 0, 0, 0,
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0, -1, -1, -1, -1, -1, -1, -1, 0, 1, 1, 1, 1, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 6, 7, 8, 9, 10, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 7, 15, 8, 17, 9, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 7, 0, 0, 8, 0, 0, 9, 0, 0, 0, 0,
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0, 0, 0, 0, 7, 0, 0, 0, 8, 0, 0, 0, 9, 0, 0, 0,
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0, 0, 0, 7, 0, 0, 0, 0, 8, 0, 0, 0, 0, 9, 0, 0,
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0, 0, 7, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 9, 0,
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0, 7, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 9
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};
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const S8 BitBoard::kingDistTable[] = {
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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0, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7,
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0, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 7,
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0, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 6, 7,
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0, 7, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 4, 5, 6, 7,
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0, 7, 6, 5, 4, 3, 2, 2, 2, 2, 2, 3, 4, 5, 6, 7,
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0, 7, 6, 5, 4, 3, 2, 1, 1, 1, 2, 3, 4, 5, 6, 7,
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0, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7,
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0, 7, 6, 5, 4, 3, 2, 1, 1, 1, 2, 3, 4, 5, 6, 7,
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0, 7, 6, 5, 4, 3, 2, 2, 2, 2, 2, 3, 4, 5, 6, 7,
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0, 7, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 4, 5, 6, 7,
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0, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 6, 7,
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0, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 7,
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0, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7,
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0, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
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};
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const S8 BitBoard::taxiDistTable[] = {
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14,13,12,11,10, 9, 8, 7, 8, 9,10,11,12,13,14,
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0,13,12,11,10, 9, 8, 7, 6, 7, 8, 9,10,11,12,13,
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0,12,11,10, 9, 8, 7, 6, 5, 6, 7, 8, 9,10,11,12,
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0,11,10, 9, 8, 7, 6, 5, 4, 5, 6, 7, 8, 9,10,11,
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0,10, 9, 8, 7, 6, 5, 4, 3, 4, 5, 6, 7, 8, 9,10,
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0, 9, 8, 7, 6, 5, 4, 3, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 8, 7, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 8,
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0, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7,
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0, 8, 7, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 8,
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0, 9, 8, 7, 6, 5, 4, 3, 2, 3, 4, 5, 6, 7, 8, 9,
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0,10, 9, 8, 7, 6, 5, 4, 3, 4, 5, 6, 7, 8, 9,10,
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0,11,10, 9, 8, 7, 6, 5, 4, 5, 6, 7, 8, 9,10,11,
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0,12,11,10, 9, 8, 7, 6, 5, 6, 7, 8, 9,10,11,12,
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0,13,12,11,10, 9, 8, 7, 6, 7, 8, 9,10,11,12,13,
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0,14,13,12,11,10, 9, 8, 7, 8, 9,10,11,12,13,14
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};
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const int BitBoard::trailingZ[64] = {
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63, 0, 58, 1, 59, 47, 53, 2,
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60, 39, 48, 27, 54, 33, 42, 3,
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61, 51, 37, 40, 49, 18, 28, 20,
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55, 30, 34, 11, 43, 14, 22, 4,
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62, 57, 46, 52, 38, 26, 32, 41,
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50, 36, 17, 19, 29, 10, 13, 21,
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56, 45, 25, 31, 35, 16, 9, 12,
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44, 24, 15, 8, 23, 7, 6, 5
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};
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U64 BitBoard::squaresBetween[64][64];
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static U64 createPattern(int i, U64 mask) {
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U64 ret = 0ULL;
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for (int j = 0; ; j++) {
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U64 nextMask = mask & (mask - 1);
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U64 bit = mask ^ nextMask;
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if ((i & (1ULL << j)) != 0)
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ret |= bit;
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mask = nextMask;
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if (mask == 0)
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break;
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}
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return ret;
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}
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static U64 addRay(U64 mask, int x, int y, int dx, int dy,
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U64 occupied, bool inner) {
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int lo = inner ? 1 : 0;
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int hi = inner ? 6 : 7;
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while (true) {
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if (dx != 0) {
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x += dx; if ((x < lo) || (x > hi)) break;
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}
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if (dy != 0) {
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y += dy; if ((y < lo) || (y > hi)) break;
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}
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int sq = Position::getSquare(x, y);
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mask |= 1ULL << sq;
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if ((occupied & (1ULL << sq)) != 0)
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break;
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}
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return mask;
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}
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static U64 addRookRays(int x, int y, U64 occupied, bool inner) {
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U64 mask = 0;
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mask = addRay(mask, x, y, 1, 0, occupied, inner);
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mask = addRay(mask, x, y, -1, 0, occupied, inner);
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mask = addRay(mask, x, y, 0, 1, occupied, inner);
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mask = addRay(mask, x, y, 0, -1, occupied, inner);
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return mask;
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}
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static U64 addBishopRays(int x, int y, U64 occupied, bool inner) {
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U64 mask = 0;
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mask = addRay(mask, x, y, 1, 1, occupied, inner);
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mask = addRay(mask, x, y, -1, -1, occupied, inner);
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mask = addRay(mask, x, y, 1, -1, occupied, inner);
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mask = addRay(mask, x, y, -1, 1, occupied, inner);
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return mask;
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}
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static StaticInitializer<BitBoard> bbInit;
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void
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BitBoard::staticInitialize() {
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for (int f = 0; f < 8; f++) {
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U64 m = 0;
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if (f > 0) m |= 1ULL << Position::getSquare(f-1, 3);
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if (f < 7) m |= 1ULL << Position::getSquare(f+1, 3);
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epMaskW[f] = m;
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m = 0;
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if (f > 0) m |= 1ULL << Position::getSquare(f-1, 4);
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if (f < 7) m |= 1ULL << Position::getSquare(f+1, 4);
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epMaskB[f] = m;
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}
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// Compute king attacks
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for (int sq = 0; sq < 64; sq++) {
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U64 m = 1ULL << sq;
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U64 mask = (((m >> 1) | (m << 7) | (m >> 9)) & maskAToGFiles) |
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(((m << 1) | (m << 9) | (m >> 7)) & maskBToHFiles) |
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(m << 8) | (m >> 8);
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kingAttacks[sq] = mask;
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}
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// Compute knight attacks
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for (int sq = 0; sq < 64; sq++) {
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U64 m = 1ULL << sq;
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U64 mask = (((m << 6) | (m >> 10)) & maskAToFFiles) |
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(((m << 15) | (m >> 17)) & maskAToGFiles) |
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(((m << 17) | (m >> 15)) & maskBToHFiles) |
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(((m << 10) | (m >> 6)) & maskCToHFiles);
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knightAttacks[sq] = mask;
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}
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// Compute pawn attacks
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for (int sq = 0; sq < 64; sq++) {
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U64 m = 1ULL << sq;
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U64 mask = ((m << 7) & maskAToGFiles) | ((m << 9) & maskBToHFiles);
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wPawnAttacks[sq] = mask;
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mask = ((m >> 9) & maskAToGFiles) | ((m >> 7) & maskBToHFiles);
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bPawnAttacks[sq] = mask;
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}
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// Rook magics
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int rTableSize = 0;
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for (int sq = 0; sq < 64; sq++)
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rTableSize += 1 << rBits[sq];
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int bTableSize = 0;
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for (int sq = 0; sq < 64; sq++)
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bTableSize += 1 << bBits[sq];
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tableData.resize(rTableSize + bTableSize);
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int tableUsed = 0;
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for (int sq = 0; sq < 64; sq++) {
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int x = Position::getX(sq);
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int y = Position::getY(sq);
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rMasks[sq] = addRookRays(x, y, 0ULL, true);
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int tableSize = 1 << rBits[sq];
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U64* table = &tableData[tableUsed];
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tableUsed += tableSize;
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const U64 unInit = 0xffffffffffffffffULL;
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for (int i = 0; i < tableSize; i++) table[i] = unInit;
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int nPatterns = 1 << BitBoard::bitCount(rMasks[sq]);
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for (int i = 0; i < nPatterns; i++) {
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U64 p = createPattern(i, rMasks[sq]);
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int entry = (int)((p * rMagics[sq]) >> (64 - rBits[sq]));
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U64 atks = addRookRays(x, y, p, false);
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if (table[entry] == unInit) {
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table[entry] = atks;
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} else {
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assert(table[entry] == atks);
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}
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}
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rTables[sq] = table;
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}
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// Bishop magics
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for (int sq = 0; sq < 64; sq++) {
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int x = Position::getX(sq);
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int y = Position::getY(sq);
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bMasks[sq] = addBishopRays(x, y, 0ULL, true);
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int tableSize = 1 << bBits[sq];
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U64* table = &tableData[tableUsed];
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tableUsed += tableSize;
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const U64 unInit = 0xffffffffffffffffULL;
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for (int i = 0; i < tableSize; i++) table[i] = unInit;
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int nPatterns = 1 << BitBoard::bitCount(bMasks[sq]);
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for (int i = 0; i < nPatterns; i++) {
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U64 p = createPattern(i, bMasks[sq]);
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int entry = (int)((p * bMagics[sq]) >> (64 - bBits[sq]));
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U64 atks = addBishopRays(x, y, p, false);
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if (table[entry] == unInit) {
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table[entry] = atks;
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|
} else {
|
|
assert(table[entry] == atks);
|
|
}
|
|
}
|
|
bTables[sq] = table;
|
|
}
|
|
|
|
// squaresBetween
|
|
for (int sq1 = 0; sq1 < 64; sq1++) {
|
|
for (int j = 0; j < 64; j++)
|
|
squaresBetween[sq1][j] = 0;
|
|
for (int dx = -1; dx <= 1; dx++) {
|
|
for (int dy = -1; dy <= 1; dy++) {
|
|
if ((dx == 0) && (dy == 0))
|
|
continue;
|
|
U64 m = 0;
|
|
int x = Position::getX(sq1);
|
|
int y = Position::getY(sq1);
|
|
while (true) {
|
|
x += dx; y += dy;
|
|
if ((x < 0) || (x > 7) || (y < 0) || (y > 7))
|
|
break;
|
|
int sq2 = Position::getSquare(x, y);
|
|
squaresBetween[sq1][sq2] = m;
|
|
m |= 1ULL << sq2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|