X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovegen.cpp;h=0f3e4ddb203f3b57db2812a4b04efc94ca58109c;hp=131bbb53c281a4a8514ae00c65e2761a56c3a02e;hb=22ca7a601f8484d03eb7e9be79e03a74d2e4aa2c;hpb=6f70e762a9a45dcf0341a6614418e5bdb73640a6 diff --git a/src/movegen.cpp b/src/movegen.cpp index 131bbb53..0f3e4ddb 100644 --- a/src/movegen.cpp +++ b/src/movegen.cpp @@ -52,19 +52,65 @@ namespace { EVASION }; - // Helper templates template MoveStack* generate_castle_moves(const Position&, MoveStack*); template MoveStack* generate_pawn_moves(const Position&, MoveStack*, Bitboard, Square); - // Template generate_piece_moves (captures and non-captures) with specializations and overloads - template - MoveStack* generate_piece_moves(const Position&, MoveStack*, Color, Bitboard); + template + inline MoveStack* generate_discovered_checks(const Position& pos, MoveStack* mlist, Square from) { + + assert(Piece != QUEEN); + + Bitboard b = pos.attacks_from(from) & pos.empty_squares(); + if (Piece == KING) + { + Square ksq = pos.king_square(opposite_color(pos.side_to_move())); + b &= ~QueenPseudoAttacks[ksq]; + } + SERIALIZE_MOVES(b); + return mlist; + } + + template + inline MoveStack* generate_direct_checks(const Position& pos, MoveStack* mlist, Color us, + Bitboard dc, Square ksq) { + assert(Piece != KING); + + Bitboard checkSqs, b; + Square from; + const Square* ptr = pos.piece_list_begin(us, Piece); + + if ((from = *ptr++) == SQ_NONE) + return mlist; + + checkSqs = pos.attacks_from(ksq) & pos.empty_squares(); + + do + { + if ( (Piece == QUEEN && !(QueenPseudoAttacks[from] & checkSqs)) + || (Piece == ROOK && !(RookPseudoAttacks[from] & checkSqs)) + || (Piece == BISHOP && !(BishopPseudoAttacks[from] & checkSqs))) + continue; + + if (dc && bit_is_set(dc, from)) + continue; + + b = pos.attacks_from(from) & checkSqs; + SERIALIZE_MOVES(b); + + } while ((from = *ptr++) != SQ_NONE); + + return mlist; + } template<> - MoveStack* generate_piece_moves(const Position&, MoveStack*, Color, Bitboard); + inline MoveStack* generate_direct_checks(const Position& p, MoveStack* m, Color us, Bitboard dc, Square ksq) { + + return (us == WHITE ? generate_pawn_moves(p, m, dc, ksq) + : generate_pawn_moves(p, m, dc, ksq)); + } template inline MoveStack* generate_piece_moves(const Position& p, MoveStack* m, Color us, Bitboard t) { @@ -76,20 +122,35 @@ namespace { : generate_pawn_moves(p, m, t, SQ_NONE)); } - // Templates for non-capture checks generation - template - MoveStack* generate_discovered_checks(const Position&, MoveStack*, Square); + inline MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) { + + Bitboard b; + Square from; + const Square* ptr = pos.piece_list_begin(us, Piece); - template - MoveStack* generate_direct_checks(const Position&, MoveStack*, Color, Bitboard, Square); + if (*ptr != SQ_NONE) + { + do { + from = *ptr; + b = pos.attacks_from(from) & target; + SERIALIZE_MOVES(b); + } while (*++ptr != SQ_NONE); + } + return mlist; + } template<> - inline MoveStack* generate_direct_checks(const Position& p, MoveStack* m, Color us, Bitboard dc, Square ksq) { + inline MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) { - return (us == WHITE ? generate_pawn_moves(p, m, dc, ksq) - : generate_pawn_moves(p, m, dc, ksq)); + Bitboard b; + Square from = pos.king_square(us); + + b = pos.attacks_from(from) & target; + SERIALIZE_MOVES(b); + return mlist; } + } @@ -244,7 +305,7 @@ MoveStack* generate_evasions(const Position& pos, MoveStack* mlist) { case QUEEN: // In case of a queen remove also squares attacked in the other direction to // avoid possible illegal moves when queen and king are on adjacent squares. - if (direction_is_straight(checksq, ksq)) + if (RookPseudoAttacks[checksq] & (1ULL << ksq)) sliderAttacks |= RookPseudoAttacks[checksq] | pos.attacks_from(checksq); else sliderAttacks |= BishopPseudoAttacks[checksq] | pos.attacks_from(checksq); @@ -415,35 +476,6 @@ bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) { namespace { - template - MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) { - - Bitboard b; - Square from; - const Square* ptr = pos.piece_list_begin(us, Piece); - - if (*ptr != SQ_NONE) - { - do { - from = *ptr; - b = pos.attacks_from(from) & target; - SERIALIZE_MOVES(b); - } while (*++ptr != SQ_NONE); - } - return mlist; - } - - template<> - MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) { - - Bitboard b; - Square from = pos.king_square(us); - - b = pos.attacks_from(from) & target; - SERIALIZE_MOVES(b); - return mlist; - } - template inline Bitboard move_pawns(Bitboard p) { @@ -455,35 +487,27 @@ namespace { template inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard target) { - // Calculate our parametrized parameters at compile time - const Bitboard TRank8BB = (Delta == DELTA_NE || Delta == DELTA_NW ? Rank8BB : Rank1BB); const Bitboard TFileABB = (Delta == DELTA_NE || Delta == DELTA_SE ? FileABB : FileHBB); Bitboard b; Square to; // Captures in the a1-h8 (a8-h1 for black) diagonal or in the h1-a8 (h8-a1 for black) - if (Type == CAPTURE || Type == EVASION) - { - b = move_pawns(pawns) & target & ~TFileABB & ~TRank8BB; - SERIALIZE_MOVES_D(b, -Delta); - } + b = move_pawns(pawns) & target & ~TFileABB; + SERIALIZE_MOVES_D(b, -Delta); return mlist; } template - inline MoveStack* generate_promotions(const Position& pos, MoveStack* mlist, Bitboard pawns, Bitboard target) { + inline MoveStack* generate_promotions(const Position& pos, MoveStack* mlist, Bitboard pawnsOn7, Bitboard target) { - // Calculate our parametrized parameters at compile time - const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB); const Bitboard TFileABB = (Delta == DELTA_NE || Delta == DELTA_SE ? FileABB : FileHBB); - const bool IsPush = (Delta == DELTA_N || Delta == DELTA_S); Bitboard b; Square to; - // Promotions and under-promotions - b = move_pawns(pawns) & target & TRank8BB; + // Promotions and under-promotions, both captures and non-captures + b = move_pawns(pawnsOn7) & target; if (Delta != DELTA_N && Delta != DELTA_S) b &= ~TFileABB; @@ -502,16 +526,12 @@ namespace { (*mlist++).move = make_promotion_move(to - Delta, to, KNIGHT); } - // This is the only possible under promotion that can give a check - // not already included in the queen-promotion. It is not sure that - // the promoted knight will give check, but it doesn't worth to verify. - if (Type == CHECK && !IsPush) - (*mlist++).move = make_promotion_move(to - Delta, to, KNIGHT); - // This is the only possible under promotion that can give a check // not already included in the queen-promotion. - if (Type == CHECK && IsPush && bit_is_set(pos.attacks_from(to), pos.king_square(opposite_color(Us)))) + if ( Type == CHECK + && bit_is_set(pos.attacks_from(to), pos.king_square(opposite_color(Us)))) (*mlist++).move = make_promotion_move(to - Delta, to, KNIGHT); + else (void)pos; // Silence a warning under MSVC } return mlist; } @@ -519,72 +539,72 @@ namespace { template MoveStack* generate_pawn_moves(const Position& pos, MoveStack* mlist, Bitboard target, Square ksq) { - // Calculate our parametrized parameters at compile time - const Color Them = (Us == WHITE ? BLACK : WHITE); - const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB); - const Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB); - const Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB); + // Calculate our parametrized parameters at compile time, named + // according to the point of view of white side. + const Color Them = (Us == WHITE ? BLACK : WHITE); + const Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB); + const Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB); const SquareDelta TDELTA_N = (Us == WHITE ? DELTA_N : DELTA_S); const SquareDelta TDELTA_NE = (Us == WHITE ? DELTA_NE : DELTA_SE); const SquareDelta TDELTA_NW = (Us == WHITE ? DELTA_NW : DELTA_SW); Square to; - Bitboard b1, b2, enemyPieces, emptySquares; + Bitboard b1, b2, dc1, dc2, pawnPushes, emptySquares; Bitboard pawns = pos.pieces(PAWN, Us); + Bitboard pawnsOn7 = pawns & TRank7BB; + Bitboard enemyPieces = (Type == CAPTURE ? target : pos.pieces_of_color(Them)); - // Standard captures and capturing promotions and underpromotions - if (Type == CAPTURE || Type == EVASION || (pawns & TRank7BB)) + // Pre-calculate pawn pushes before changing emptySquares definition + if (Type != CAPTURE) { - enemyPieces = (Type == CAPTURE ? target : pos.pieces_of_color(opposite_color(Us))); - - if (Type == EVASION) - enemyPieces &= target; // Capture only the checker piece + emptySquares = (Type == NON_CAPTURE ? target : pos.empty_squares()); + pawnPushes = move_pawns(pawns & ~TRank7BB) & emptySquares; + } - mlist = generate_promotions(pos, mlist, pawns, enemyPieces); - mlist = generate_pawn_captures(mlist, pawns, enemyPieces); - mlist = generate_promotions(pos, mlist, pawns, enemyPieces); - mlist = generate_pawn_captures(mlist, pawns, enemyPieces); + if (Type == EVASION) + { + emptySquares &= target; // Only blocking squares + enemyPieces &= target; // Capture only the checker piece } - // Non-capturing promotions and underpromotions - if (pawns & TRank7BB) + // Promotions and underpromotions + if (pawnsOn7) { - b1 = pos.empty_squares(); + if (Type == CAPTURE) + emptySquares = pos.empty_squares(); - if (Type == EVASION) - b1 &= target; // Only blocking promotion pushes + pawns &= ~TRank7BB; + mlist = generate_promotions(pos, mlist, pawnsOn7, enemyPieces); + mlist = generate_promotions(pos, mlist, pawnsOn7, enemyPieces); + mlist = generate_promotions(pos, mlist, pawnsOn7, emptySquares); + } - mlist = generate_promotions(pos, mlist, pawns, b1); + // Standard captures + if (Type == CAPTURE || Type == EVASION) + { + mlist = generate_pawn_captures(mlist, pawns, enemyPieces); + mlist = generate_pawn_captures(mlist, pawns, enemyPieces); } - // Standard pawn pushes and double pushes + // Single and double pawn pushes if (Type != CAPTURE) { - emptySquares = (Type == NON_CAPTURE ? target : pos.empty_squares()); - - // Single and double pawn pushes - b1 = move_pawns(pawns) & emptySquares & ~TRank8BB; - b2 = move_pawns(b1 & TRank3BB) & emptySquares; + b1 = pawnPushes & emptySquares; + b2 = move_pawns(pawnPushes & TRank3BB) & emptySquares; - // Filter out unwanted pushes according to the move type - if (Type == EVASION) + if (Type == CHECK) { - b1 &= target; - b2 &= target; - } - else if (Type == CHECK) - { - // Pawn moves which give direct cheks + // Consider only pawn moves which give direct checks b1 &= pos.attacks_from(ksq, Them); b2 &= pos.attacks_from(ksq, Them); - // Pawn moves which gives discovered check. This is possible only if - // the pawn is not on the same file as the enemy king, because we - // don't generate captures. + // Add pawn moves which gives discovered check. This is possible only + // if the pawn is not on the same file as the enemy king, because we + // don't generate captures. if (pawns & target) // For CHECK type target is dc bitboard { - Bitboard dc1 = move_pawns(pawns & target & ~file_bb(ksq)) & emptySquares & ~TRank8BB; - Bitboard dc2 = move_pawns(dc1 & TRank3BB) & emptySquares; + dc1 = move_pawns(pawns & target & ~file_bb(ksq)) & emptySquares; + dc2 = move_pawns(dc1 & TRank3BB) & emptySquares; b1 |= dc1; b2 |= dc2; @@ -619,59 +639,12 @@ namespace { return mlist; } - template - MoveStack* generate_discovered_checks(const Position& pos, MoveStack* mlist, Square from) { - - assert(Piece != QUEEN); - - Bitboard b = pos.attacks_from(from) & pos.empty_squares(); - if (Piece == KING) - { - Square ksq = pos.king_square(opposite_color(pos.side_to_move())); - b &= ~QueenPseudoAttacks[ksq]; - } - SERIALIZE_MOVES(b); - return mlist; - } - - template - MoveStack* generate_direct_checks(const Position& pos, MoveStack* mlist, Color us, - Bitboard dc, Square ksq) { - assert(Piece != KING); - - Bitboard checkSqs, b; - Square from; - const Square* ptr = pos.piece_list_begin(us, Piece); - - if ((from = *ptr++) == SQ_NONE) - return mlist; - - checkSqs = pos.attacks_from(ksq) & pos.empty_squares(); - - do - { - if ( (Piece == QUEEN && !(QueenPseudoAttacks[from] & checkSqs)) - || (Piece == ROOK && !(RookPseudoAttacks[from] & checkSqs)) - || (Piece == BISHOP && !(BishopPseudoAttacks[from] & checkSqs))) - continue; - - if (dc && bit_is_set(dc, from)) - continue; - - b = pos.attacks_from(from) & checkSqs; - SERIALIZE_MOVES(b); - - } while ((from = *ptr++) != SQ_NONE); - - return mlist; - } - template MoveStack* generate_castle_moves(const Position& pos, MoveStack* mlist) { Color us = pos.side_to_move(); - if ( (Side == KING_SIDE && pos.can_castle_kingside(us)) + if ( (Side == KING_SIDE && pos.can_castle_kingside(us)) ||(Side == QUEEN_SIDE && pos.can_castle_queenside(us))) { Color them = opposite_color(us);