X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.h;h=6dd07d5407f85bc431328915c8c459e3a043d7f7;hp=fa1f9d20ad9d0dae3dc8a7f501655a3a4157bd22;hb=10e64e05094e75d89baa4495fa867a8a64195bb7;hpb=29be28e1a24898cec64470332740eaa54893b7a4 diff --git a/src/bitboard.h b/src/bitboard.h index fa1f9d20..6dd07d54 100644 --- a/src/bitboard.h +++ b/src/bitboard.h @@ -1,7 +1,7 @@ /* 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 + Copyright (C) 2008-2012 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 @@ -23,85 +23,53 @@ #include "types.h" -const Bitboard EmptyBoardBB = 0; - -const Bitboard FileABB = 0x0101010101010101ULL; -const Bitboard FileBBB = FileABB << 1; -const Bitboard FileCBB = FileABB << 2; -const Bitboard FileDBB = FileABB << 3; -const Bitboard FileEBB = FileABB << 4; -const Bitboard FileFBB = FileABB << 5; -const Bitboard FileGBB = FileABB << 6; -const Bitboard FileHBB = FileABB << 7; - -const Bitboard Rank1BB = 0xFF; -const Bitboard Rank2BB = Rank1BB << (8 * 1); -const Bitboard Rank3BB = Rank1BB << (8 * 2); -const Bitboard Rank4BB = Rank1BB << (8 * 3); -const Bitboard Rank5BB = Rank1BB << (8 * 4); -const Bitboard Rank6BB = Rank1BB << (8 * 5); -const Bitboard Rank7BB = Rank1BB << (8 * 6); -const Bitboard Rank8BB = Rank1BB << (8 * 7); - -extern Bitboard SquaresByColorBB[2]; +CACHE_LINE_ALIGNMENT + +extern Bitboard RMasks[64]; +extern Bitboard RMagics[64]; +extern Bitboard* RAttacks[64]; +extern unsigned RShifts[64]; + +extern Bitboard BMasks[64]; +extern Bitboard BMagics[64]; +extern Bitboard* BAttacks[64]; +extern unsigned BShifts[64]; + +extern Bitboard SquareBB[64]; extern Bitboard FileBB[8]; -extern Bitboard NeighboringFilesBB[8]; -extern Bitboard ThisAndNeighboringFilesBB[8]; extern Bitboard RankBB[8]; +extern Bitboard AdjacentFilesBB[8]; +extern Bitboard ThisAndAdjacentFilesBB[8]; extern Bitboard InFrontBB[2][8]; - -extern Bitboard SetMaskBB[65]; -extern Bitboard ClearMaskBB[65]; - extern Bitboard StepAttacksBB[16][64]; extern Bitboard BetweenBB[64][64]; - extern Bitboard SquaresInFrontMask[2][64]; extern Bitboard PassedPawnMask[2][64]; extern Bitboard AttackSpanMask[2][64]; - -extern uint64_t RMult[64]; -extern int RShift[64]; -extern Bitboard RMask[64]; -extern Bitboard* RAttacks[64]; - -extern uint64_t BMult[64]; -extern int BShift[64]; -extern Bitboard BMask[64]; -extern Bitboard* BAttacks[64]; - -extern Bitboard BishopPseudoAttacks[64]; -extern Bitboard RookPseudoAttacks[64]; -extern Bitboard QueenPseudoAttacks[64]; - -extern uint8_t BitCount8Bit[256]; +extern Bitboard PseudoAttacks[6][64]; -/// Functions for testing whether a given bit is set in a bitboard, and for -/// setting and clearing bits. +/// Overloads of bitwise operators between a Bitboard and a Square for testing +/// whether a given bit is set in a bitboard, and for setting and clearing bits. -inline Bitboard bit_is_set(Bitboard b, Square s) { - return b & SetMaskBB[s]; +inline Bitboard operator&(Bitboard b, Square s) { + return b & SquareBB[s]; } -inline void set_bit(Bitboard* b, Square s) { - *b |= SetMaskBB[s]; +inline Bitboard& operator|=(Bitboard& b, Square s) { + return b |= SquareBB[s]; } -inline void clear_bit(Bitboard* b, Square s) { - *b &= ClearMaskBB[s]; +inline Bitboard& operator^=(Bitboard& b, Square s) { + return b ^= SquareBB[s]; } - -/// Functions used to update a bitboard after a move. This is faster -/// then calling a sequence of clear_bit() + set_bit() - -inline Bitboard make_move_bb(Square from, Square to) { - return SetMaskBB[from] | SetMaskBB[to]; +inline Bitboard operator|(Bitboard b, Square s) { + return b | SquareBB[s]; } -inline void do_move_bb(Bitboard* b, Bitboard move_bb) { - *b ^= move_bb; +inline Bitboard operator^(Bitboard b, Square s) { + return b ^ SquareBB[s]; } @@ -125,27 +93,19 @@ inline Bitboard file_bb(Square s) { } -/// neighboring_files_bb takes a file or a square as input and returns a -/// bitboard representing all squares on the neighboring files. +/// adjacent_files_bb takes a file as input and returns a bitboard representing +/// all squares on the adjacent files. -inline Bitboard neighboring_files_bb(File f) { - return NeighboringFilesBB[f]; +inline Bitboard adjacent_files_bb(File f) { + return AdjacentFilesBB[f]; } -inline Bitboard neighboring_files_bb(Square s) { - return NeighboringFilesBB[file_of(s)]; -} +/// this_and_adjacent_files_bb takes a file as input and returns a bitboard +/// representing all squares on the given and adjacent files. -/// this_and_neighboring_files_bb takes a file or a square as input and returns -/// a bitboard representing all squares on the given and neighboring files. - -inline Bitboard this_and_neighboring_files_bb(File f) { - return ThisAndNeighboringFilesBB[f]; -} - -inline Bitboard this_and_neighboring_files_bb(Square s) { - return ThisAndNeighboringFilesBB[file_of(s)]; +inline Bitboard this_and_adjacent_files_bb(File f) { + return ThisAndAdjacentFilesBB[f]; } @@ -164,39 +124,28 @@ inline Bitboard in_front_bb(Color c, Square s) { } -/// Functions for computing sliding attack bitboards. rook_attacks_bb(), -/// bishop_attacks_bb() and queen_attacks_bb() all take a square and a -/// bitboard of occupied squares as input, and return a bitboard representing -/// all squares attacked by a rook, bishop or queen on the given square. +/// Functions for computing sliding attack bitboards. Function attacks_bb() takes +/// a square and a bitboard of occupied squares as input, and returns a bitboard +/// representing all squares attacked by Pt (bishop or rook) on the given square. +template +FORCE_INLINE unsigned magic_index(Square s, Bitboard occ) { -#if defined(IS_64BIT) + Bitboard* const Masks = Pt == ROOK ? RMasks : BMasks; + Bitboard* const Magics = Pt == ROOK ? RMagics : BMagics; + unsigned* const Shifts = Pt == ROOK ? RShifts : BShifts; -inline Bitboard rook_attacks_bb(Square s, Bitboard occ) { - return RAttacks[s][((occ & RMask[s]) * RMult[s]) >> RShift[s]]; -} + if (Is64Bit) + return unsigned(((occ & Masks[s]) * Magics[s]) >> Shifts[s]); -inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) { - return BAttacks[s][((occ & BMask[s]) * BMult[s]) >> BShift[s]]; + unsigned lo = unsigned(occ) & unsigned(Masks[s]); + unsigned hi = unsigned(occ >> 32) & unsigned(Masks[s] >> 32); + return (lo * unsigned(Magics[s]) ^ hi * unsigned(Magics[s] >> 32)) >> Shifts[s]; } -#else // if !defined(IS_64BIT) - -inline Bitboard rook_attacks_bb(Square s, Bitboard occ) { - Bitboard b = occ & RMask[s]; - return RAttacks[s] - [unsigned(int(b) * int(RMult[s]) ^ int(b >> 32) * int(RMult[s] >> 32)) >> RShift[s]]; -} - -inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) { - Bitboard b = occ & BMask[s]; - return BAttacks[s] - [unsigned(int(b) * int(BMult[s]) ^ int(b >> 32) * int(BMult[s] >> 32)) >> BShift[s]]; -} - -#endif - -inline Bitboard queen_attacks_bb(Square s, Bitboard blockers) { - return rook_attacks_bb(s, blockers) | bishop_attacks_bb(s, blockers); +template +inline Bitboard attacks_bb(Square s, Bitboard occ) { + Bitboard** const Attacks = Pt == ROOK ? RAttacks : BAttacks; + return Attacks[s][magic_index(s, occ)]; } @@ -223,7 +172,7 @@ inline Bitboard squares_in_front_of(Color c, Square s) { /// passed_pawn_mask takes a color and a square as input, and returns a /// bitboard mask which can be used to test if a pawn of the given color on /// the given square is a passed pawn. Definition of the table is: -/// PassedPawnMask[c][s] = in_front_bb(c, s) & this_and_neighboring_files_bb(s) +/// PassedPawnMask[c][s] = in_front_bb(c, s) & this_and_adjacent_files_bb(s) inline Bitboard passed_pawn_mask(Color c, Square s) { return PassedPawnMask[c][s]; @@ -233,7 +182,7 @@ inline Bitboard passed_pawn_mask(Color c, Square s) { /// attack_span_mask takes a color and a square as input, and returns a bitboard /// representing all squares that can be attacked by a pawn of the given color /// when it moves along its file starting from the given square. Definition is: -/// AttackSpanMask[c][s] = in_front_bb(c, s) & neighboring_files_bb(s); +/// AttackSpanMask[c][s] = in_front_bb(c, s) & adjacent_files_bb(s); inline Bitboard attack_span_mask(Color c, Square s) { return AttackSpanMask[c][s]; @@ -245,7 +194,24 @@ inline Bitboard attack_span_mask(Color c, Square s) { inline bool squares_aligned(Square s1, Square s2, Square s3) { return (BetweenBB[s1][s2] | BetweenBB[s1][s3] | BetweenBB[s2][s3]) - & ( SetMaskBB[s1] | SetMaskBB[s2] | SetMaskBB[s3]); + & ( SquareBB[s1] | SquareBB[s2] | SquareBB[s3]); +} + + +/// same_color_squares() returns a bitboard representing all squares with +/// the same color of the given square. + +inline Bitboard same_color_squares(Square s) { + return Bitboard(0xAA55AA55AA55AA55ULL) & s ? 0xAA55AA55AA55AA55ULL + : ~0xAA55AA55AA55AA55ULL; +} + + +/// single_bit() returns true if in the 'b' bitboard is set a single bit (or if +/// b == 0). + +inline bool single_bit(Bitboard b) { + return !(b & (b - 1)); } @@ -258,9 +224,15 @@ inline bool squares_aligned(Square s1, Square s2, Square s3) { #if defined(_MSC_VER) && !defined(__INTEL_COMPILER) FORCE_INLINE Square first_1(Bitboard b) { - unsigned long index; - _BitScanForward64(&index, b); - return (Square) index; + unsigned long index; + _BitScanForward64(&index, b); + return (Square) index; +} + +FORCE_INLINE Square last_1(Bitboard b) { + unsigned long index; + _BitScanReverse64(&index, b); + return (Square) index; } #else @@ -269,6 +241,12 @@ FORCE_INLINE Square first_1(Bitboard b) { // Assembly code by Heinz van Saanen __asm__("bsfq %1, %0": "=r"(dummy): "rm"(b) ); return (Square) dummy; } + +FORCE_INLINE Square last_1(Bitboard b) { + Bitboard dummy; + __asm__("bsrq %1, %0": "=r"(dummy): "rm"(b) ); + return (Square) dummy; +} #endif FORCE_INLINE Square pop_1st_bit(Bitboard* b) { @@ -280,12 +258,12 @@ FORCE_INLINE Square pop_1st_bit(Bitboard* b) { #else // if !defined(USE_BSFQ) extern Square first_1(Bitboard b); +extern Square last_1(Bitboard b); extern Square pop_1st_bit(Bitboard* b); #endif - extern void print_bitboard(Bitboard b); -extern void init_bitboards(); +extern void bitboards_init(); #endif // !defined(BITBOARD_H_INCLUDED)