X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.h;h=c613654965861ad9515410cdb165ef4ba4e15a7f;hp=6b277cd5a703eeee500c416cf70ffa38c3d09704;hb=90890844ade67d8081a5284700cc2ef3ebdbb62d;hpb=b196af4dcdbd692c9165b65fe5f1204cb48ca56b diff --git a/src/bitboard.h b/src/bitboard.h index 6b277cd5..c6136549 100644 --- a/src/bitboard.h +++ b/src/bitboard.h @@ -18,27 +18,14 @@ along with this program. If not, see . */ - #if !defined(BITBOARD_H_INCLUDED) #define BITBOARD_H_INCLUDED -//// -//// Includes -//// - -#include "direction.h" -#include "piece.h" -#include "square.h" #include "types.h" - -//// -//// Constants and variables -//// - const Bitboard EmptyBoardBB = 0; -const Bitboard FileABB = 0x0101010101010101; +const Bitboard FileABB = 0x0101010101010101ULL; const Bitboard FileBBB = FileABB << 1; const Bitboard FileCBB = FileABB << 2; const Bitboard FileDBB = FileABB << 3; @@ -56,36 +43,32 @@ const Bitboard Rank6BB = Rank1BB << (8 * 5); const Bitboard Rank7BB = Rank1BB << (8 * 6); const Bitboard Rank8BB = Rank1BB << (8 * 7); -extern const Bitboard SquaresByColorBB[2]; -extern const Bitboard FileBB[8]; -extern const Bitboard NeighboringFilesBB[8]; -extern const Bitboard ThisAndNeighboringFilesBB[8]; -extern const Bitboard RankBB[8]; -extern const Bitboard RelativeRankBB[2][8]; -extern const Bitboard InFrontBB[2][8]; +extern Bitboard SquaresByColorBB[2]; +extern Bitboard FileBB[8]; +extern Bitboard NeighboringFilesBB[8]; +extern Bitboard ThisAndNeighboringFilesBB[8]; +extern Bitboard RankBB[8]; +extern Bitboard InFrontBB[2][8]; extern Bitboard SetMaskBB[65]; extern Bitboard ClearMaskBB[65]; -extern Bitboard StepAttackBB[16][64]; -extern Bitboard RayBB[64][8]; +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 const uint64_t RMult[64]; -extern const int RShift[64]; -extern Bitboard RMask[64]; -extern int RAttackIndex[64]; -extern Bitboard RAttacks[0x19000]; +extern uint64_t RMagics[64]; +extern int RShifts[64]; +extern Bitboard RMasks[64]; +extern Bitboard* RAttacks[64]; -extern const uint64_t BMult[64]; -extern const int BShift[64]; -extern Bitboard BMask[64]; -extern int BAttackIndex[64]; -extern Bitboard BAttacks[0x1480]; +extern uint64_t BMagics[64]; +extern int BShifts[64]; +extern Bitboard BMasks[64]; +extern Bitboard* BAttacks[64]; extern Bitboard BishopPseudoAttacks[64]; extern Bitboard RookPseudoAttacks[64]; @@ -94,10 +77,6 @@ extern Bitboard QueenPseudoAttacks[64]; extern uint8_t BitCount8Bit[256]; -//// -//// Inline functions -//// - /// Functions for testing whether a given bit is set in a bitboard, and for /// setting and clearing bits. @@ -105,11 +84,11 @@ inline Bitboard bit_is_set(Bitboard b, Square s) { return b & SetMaskBB[s]; } -inline void set_bit(Bitboard *b, Square s) { +inline void set_bit(Bitboard* b, Square s) { *b |= SetMaskBB[s]; } -inline void clear_bit(Bitboard *b, Square s) { +inline void clear_bit(Bitboard* b, Square s) { *b &= ClearMaskBB[s]; } @@ -121,11 +100,12 @@ inline Bitboard make_move_bb(Square from, Square to) { return SetMaskBB[from] | SetMaskBB[to]; } -inline void do_move_bb(Bitboard *b, Bitboard move_bb) { +inline void do_move_bb(Bitboard* b, Bitboard move_bb) { *b ^= move_bb; } -/// rank_bb() and file_bb() take a file or a square as input, and return + +/// rank_bb() and file_bb() take a file or a square as input and return /// a bitboard representing all squares on the given file or rank. inline Bitboard rank_bb(Rank r) { @@ -133,7 +113,7 @@ inline Bitboard rank_bb(Rank r) { } inline Bitboard rank_bb(Square s) { - return rank_bb(square_rank(s)); + return RankBB[rank_of(s)]; } inline Bitboard file_bb(File f) { @@ -141,11 +121,11 @@ inline Bitboard file_bb(File f) { } inline Bitboard file_bb(Square s) { - return file_bb(square_file(s)); + return FileBB[file_of(s)]; } -/// neighboring_files_bb takes a file or a square as input, and returns a +/// neighboring_files_bb takes a file or a square as input and returns a /// bitboard representing all squares on the neighboring files. inline Bitboard neighboring_files_bb(File f) { @@ -153,31 +133,19 @@ inline Bitboard neighboring_files_bb(File f) { } inline Bitboard neighboring_files_bb(Square s) { - return NeighboringFilesBB[square_file(s)]; + return NeighboringFilesBB[file_of(s)]; } -/// 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. +/// 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[square_file(s)]; -} - - -/// relative_rank_bb() takes a color and a rank as input, and returns a bitboard -/// representing all squares on the given rank from the given color's point of -/// view. For instance, relative_rank_bb(WHITE, 7) gives all squares on the -/// 7th rank, while relative_rank_bb(BLACK, 7) gives all squares on the 2nd -/// rank. - -inline Bitboard relative_rank_bb(Color c, Rank r) { - return RelativeRankBB[c][r]; + return ThisAndNeighboringFilesBB[file_of(s)]; } @@ -192,28 +160,7 @@ inline Bitboard in_front_bb(Color c, Rank r) { } inline Bitboard in_front_bb(Color c, Square s) { - return InFrontBB[c][square_rank(s)]; -} - - -/// behind_bb() takes a color and a rank or square as input, and returns a -/// bitboard representing all the squares on all ranks behind of the rank -/// (or square), from the given color's point of view. - -inline Bitboard behind_bb(Color c, Rank r) { - return InFrontBB[opposite_color(c)][r]; -} - -inline Bitboard behind_bb(Color c, Square s) { - return InFrontBB[opposite_color(c)][square_rank(s)]; -} - - -/// ray_bb() gives a bitboard representing all squares along the ray in a -/// given direction from a given square. - -inline Bitboard ray_bb(Square s, SignedDirection d) { - return RayBB[s][d]; + return InFrontBB[c][rank_of(s)]; } @@ -224,32 +171,26 @@ inline Bitboard ray_bb(Square s, SignedDirection d) { #if defined(IS_64BIT) -inline Bitboard rook_attacks_bb(Square s, Bitboard blockers) { - Bitboard b = blockers & RMask[s]; - return RAttacks[RAttackIndex[s] + ((b * RMult[s]) >> RShift[s])]; +inline Bitboard rook_attacks_bb(Square s, Bitboard occ) { + return RAttacks[s][((occ & RMasks[s]) * RMagics[s]) >> RShifts[s]]; } -inline Bitboard bishop_attacks_bb(Square s, Bitboard blockers) { - Bitboard b = blockers & BMask[s]; - return BAttacks[BAttackIndex[s] + ((b * BMult[s]) >> BShift[s])]; +inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) { + return BAttacks[s][((occ & BMasks[s]) * BMagics[s]) >> BShifts[s]]; } #else // if !defined(IS_64BIT) -inline Bitboard rook_attacks_bb(Square s, Bitboard blockers) { - Bitboard b = blockers & RMask[s]; - return RAttacks[RAttackIndex[s] + - (unsigned(int(b) * int(RMult[s]) ^ - int(b >> 32) * int(RMult[s] >> 32)) - >> RShift[s])]; +inline Bitboard rook_attacks_bb(Square s, Bitboard occ) { + Bitboard b = occ & RMasks[s]; + return RAttacks[s] + [unsigned(int(b) * int(RMagics[s]) ^ int(b >> 32) * int(RMagics[s] >> 32)) >> RShifts[s]]; } -inline Bitboard bishop_attacks_bb(Square s, Bitboard blockers) { - Bitboard b = blockers & BMask[s]; - return BAttacks[BAttackIndex[s] + - (unsigned(int(b) * int(BMult[s]) ^ - int(b >> 32) * int(BMult[s] >> 32)) - >> BShift[s])]; +inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) { + Bitboard b = occ & BMasks[s]; + return BAttacks[s] + [unsigned(int(b) * int(BMagics[s]) ^ int(b >> 32) * int(BMagics[s] >> 32)) >> BShifts[s]]; } #endif @@ -279,14 +220,6 @@ inline Bitboard squares_in_front_of(Color c, Square s) { } -/// squares_behind is similar to squares_in_front, but returns the squares -/// behind the square instead of in front of the square. - -inline Bitboard squares_behind(Color c, Square s) { - return SquaresInFrontMask[opposite_color(c)][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: @@ -307,19 +240,38 @@ inline Bitboard attack_span_mask(Color c, Square s) { } +/// squares_aligned returns true if the squares s1, s2 and s3 are aligned +/// either on a straight or on a diagonal line. + +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]); +} + + /// first_1() finds the least significant nonzero bit in a nonzero bitboard. /// pop_1st_bit() finds and clears the least significant nonzero bit in a /// nonzero bitboard. -#if defined(USE_BSFQ) // Assembly code by Heinz van Saanen +#if defined(USE_BSFQ) + +#if defined(_MSC_VER) && !defined(__INTEL_COMPILER) + +FORCE_INLINE Square first_1(Bitboard b) { + unsigned long index; + _BitScanForward64(&index, b); + return (Square) index; +} +#else -inline Square first_1(Bitboard b) { +FORCE_INLINE Square first_1(Bitboard b) { // Assembly code by Heinz van Saanen Bitboard dummy; __asm__("bsfq %1, %0": "=r"(dummy): "rm"(b) ); - return (Square)(dummy); + return (Square) dummy; } +#endif -inline Square pop_1st_bit(Bitboard* b) { +FORCE_INLINE Square pop_1st_bit(Bitboard* b) { const Square s = first_1(*b); *b &= ~(1ULL<