X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.h;h=f8440a23a1aaf3f71635c672200786573d26b2b7;hp=c9f724277a6f5d5efabc82d0958396741a6aa35e;hb=5446e6f408f2ed7fa281dbe0097c46674d193260;hpb=9afa1d73306cb98e95acec5daf4efd65e592ceff diff --git a/src/bitboard.h b/src/bitboard.h index c9f72427..f8440a23 100644 --- a/src/bitboard.h +++ b/src/bitboard.h @@ -2,7 +2,7 @@ Stockfish, a UCI chess playing engine derived from Glaurung 2.1 Copyright (C) 2004-2008 Tord Romstad (Glaurung author) Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad - Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad + Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, 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 @@ -39,26 +39,26 @@ const std::string pretty(Bitboard b); } -const Bitboard AllSquares = ~Bitboard(0); -const Bitboard DarkSquares = 0xAA55AA55AA55AA55ULL; - -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); +constexpr Bitboard AllSquares = ~Bitboard(0); +constexpr Bitboard DarkSquares = 0xAA55AA55AA55AA55ULL; + +constexpr Bitboard FileABB = 0x0101010101010101ULL; +constexpr Bitboard FileBBB = FileABB << 1; +constexpr Bitboard FileCBB = FileABB << 2; +constexpr Bitboard FileDBB = FileABB << 3; +constexpr Bitboard FileEBB = FileABB << 4; +constexpr Bitboard FileFBB = FileABB << 5; +constexpr Bitboard FileGBB = FileABB << 6; +constexpr Bitboard FileHBB = FileABB << 7; + +constexpr Bitboard Rank1BB = 0xFF; +constexpr Bitboard Rank2BB = Rank1BB << (8 * 1); +constexpr Bitboard Rank3BB = Rank1BB << (8 * 2); +constexpr Bitboard Rank4BB = Rank1BB << (8 * 3); +constexpr Bitboard Rank5BB = Rank1BB << (8 * 4); +constexpr Bitboard Rank6BB = Rank1BB << (8 * 5); +constexpr Bitboard Rank7BB = Rank1BB << (8 * 6); +constexpr Bitboard Rank8BB = Rank1BB << (8 * 7); extern int SquareDistance[SQUARE_NB][SQUARE_NB]; @@ -107,22 +107,27 @@ extern Magic BishopMagics[SQUARE_NB]; /// whether a given bit is set in a bitboard, and for setting and clearing bits. inline Bitboard operator&(Bitboard b, Square s) { + assert(s >= SQ_A1 && s <= SQ_H8); return b & SquareBB[s]; } inline Bitboard operator|(Bitboard b, Square s) { + assert(s >= SQ_A1 && s <= SQ_H8); return b | SquareBB[s]; } inline Bitboard operator^(Bitboard b, Square s) { + assert(s >= SQ_A1 && s <= SQ_H8); return b ^ SquareBB[s]; } inline Bitboard& operator|=(Bitboard& b, Square s) { + assert(s >= SQ_A1 && s <= SQ_H8); return b |= SquareBB[s]; } inline Bitboard& operator^=(Bitboard& b, Square s) { + assert(s >= SQ_A1 && s <= SQ_H8); return b ^= SquareBB[s]; } @@ -130,6 +135,10 @@ constexpr bool more_than_one(Bitboard b) { return b & (b - 1); } +inline bool opposite_colors(Square s1, Square s2) { + return bool(DarkSquares & s1) != bool(DarkSquares & s2); +} + /// rank_bb() and file_bb() return a bitboard representing all the squares on /// the given file or rank. @@ -150,17 +159,38 @@ inline Bitboard file_bb(Square s) { } -/// shift() moves a bitboard one step along direction D. Mainly for pawns +/// shift() moves a bitboard one step along direction D (mainly for pawns) template constexpr Bitboard shift(Bitboard b) { return D == NORTH ? b << 8 : D == SOUTH ? b >> 8 - : D == NORTH_EAST ? (b & ~FileHBB) << 9 : D == SOUTH_EAST ? (b & ~FileHBB) >> 7 - : D == NORTH_WEST ? (b & ~FileABB) << 7 : D == SOUTH_WEST ? (b & ~FileABB) >> 9 + : D == EAST ? (b & ~FileHBB) << 1 : D == WEST ? (b & ~FileABB) >> 1 + : D == NORTH_EAST ? (b & ~FileHBB) << 9 : D == NORTH_WEST ? (b & ~FileABB) << 7 + : D == SOUTH_EAST ? (b & ~FileHBB) >> 7 : D == SOUTH_WEST ? (b & ~FileABB) >> 9 : 0; } +/// pawn_attacks_bb() returns the pawn attacks for the given color from the +/// squares in the given bitboard. + +template +constexpr Bitboard pawn_attacks_bb(Bitboard b) { + return C == WHITE ? shift(b) | shift(b) + : shift(b) | shift(b); +} + + +/// double_pawn_attacks_bb() returns the pawn attacks for the given color +/// from the squares in the given bitboard. + +template +constexpr Bitboard double_pawn_attacks_bb(Bitboard b) { + return C == WHITE ? shift(b) & shift(b) + : shift(b) & shift(b); +} + + /// adjacent_files_bb() returns a bitboard representing all the squares on the /// adjacent files of the given one. @@ -179,9 +209,9 @@ inline Bitboard between_bb(Square s1, Square s2) { } -/// forward_ranks_bb() returns a bitboard representing all the squares on all the ranks -/// in front of the given one, from the point of view of the given color. For -/// instance, forward_ranks_bb(BLACK, SQ_D3) will return the 16 squares on ranks 1 and 2. +/// forward_ranks_bb() returns a bitboard representing the squares on all the ranks +/// in front of the given one, from the point of view of the given color. For instance, +/// forward_ranks_bb(BLACK, SQ_D3) will return the 16 squares on ranks 1 and 2. inline Bitboard forward_ranks_bb(Color c, Square s) { return ForwardRanksBB[c][rank_of(s)]; @@ -283,7 +313,7 @@ inline int popcount(Bitboard b) { /// lsb() and msb() return the least/most significant bit in a non-zero bitboard -#if defined(__GNUC__) +#if defined(__GNUC__) // GCC, Clang, ICC inline Square lsb(Bitboard b) { assert(b); @@ -295,7 +325,9 @@ inline Square msb(Bitboard b) { return Square(63 ^ __builtin_clzll(b)); } -#elif defined(_WIN64) && defined(_MSC_VER) +#elif defined(_MSC_VER) // MSVC + +#ifdef _WIN64 // MSVC, WIN64 inline Square lsb(Bitboard b) { assert(b); @@ -311,12 +343,39 @@ inline Square msb(Bitboard b) { return (Square) idx; } -#else +#else // MSVC, WIN32 + +inline Square lsb(Bitboard b) { + assert(b); + unsigned long idx; + + if (b & 0xffffffff) { + _BitScanForward(&idx, int32_t(b)); + return Square(idx); + } else { + _BitScanForward(&idx, int32_t(b >> 32)); + return Square(idx + 32); + } +} + +inline Square msb(Bitboard b) { + assert(b); + unsigned long idx; + + if (b >> 32) { + _BitScanReverse(&idx, int32_t(b >> 32)); + return Square(idx + 32); + } else { + _BitScanReverse(&idx, int32_t(b)); + return Square(idx); + } +} + +#endif -#define NO_BSF // Fallback on software implementation for other cases +#else // Compiler is neither GCC nor MSVC compatible -Square lsb(Bitboard b); -Square msb(Bitboard b); +#error "Compiler not supported." #endif