diff --git a/src/movegen.cpp b/src/movegen.cpp index 3dfd8f6a..da8d08c3 100644 --- a/src/movegen.cpp +++ b/src/movegen.cpp @@ -32,29 +32,15 @@ namespace { - inline Bitboard forward_white(Bitboard b) { return b << 8; } - inline Bitboard forward_right_white(Bitboard b) { return b << 9; } - inline Bitboard forward_left_white(Bitboard b) { return b << 7; } - - inline Bitboard forward_black(Bitboard b) { return b >> 8; } - inline Bitboard forward_right_black(Bitboard b) { return b >> 7; } - inline Bitboard forward_left_black(Bitboard b) { return b >> 9; } - struct PawnOffsets { Bitboard Rank3BB, Rank8BB; Rank RANK_8; SquareDelta DELTA_N, DELTA_NE, DELTA_NW; Color us, them; - typedef Bitboard (*Shift_fn)(Bitboard b); - Shift_fn forward, forward_left, forward_right; }; - - const PawnOffsets WhitePawnOffsets = { Rank3BB, Rank8BB, RANK_8, DELTA_N, DELTA_NE, DELTA_NW, WHITE, BLACK, - &forward_white, forward_left_white, forward_right_white }; - - const PawnOffsets BlackPawnOffsets = { Rank6BB, Rank1BB, RANK_1, DELTA_S, DELTA_SE, DELTA_SW, BLACK, WHITE, - &forward_black, &forward_left_black, &forward_right_black }; + const PawnOffsets WhitePawnOffsets = { Rank3BB, Rank8BB, RANK_8, DELTA_N, DELTA_NE, DELTA_NW, WHITE, BLACK }; + const PawnOffsets BlackPawnOffsets = { Rank6BB, Rank1BB, RANK_1, DELTA_S, DELTA_SE, DELTA_SW, BLACK, WHITE }; int generate_castle_moves(const Position&, MoveStack*, Color); @@ -648,7 +634,7 @@ namespace { int n = 0; // Captures in the a1-h8 (a8-h1 for black) direction - Bitboard b1 = (ofs.forward_right)(pawns) & ~FileABB & enemyPieces; + Bitboard b1 = (C == WHITE ? pawns << 9 : pawns >> 7) & ~FileABB & enemyPieces; // Capturing promotions Bitboard b2 = b1 & ofs.Rank8BB; @@ -667,7 +653,7 @@ namespace { } // Captures in the h1-a8 (h8-a1 for black) direction - b1 = (ofs.forward_left)(pawns) & ~FileHBB & enemyPieces; + b1 = (C == WHITE ? pawns << 7 : pawns >> 9) & ~FileHBB & enemyPieces; // Capturing promotions b2 = b1 & ofs.Rank8BB; @@ -686,7 +672,7 @@ namespace { } // Non-capturing promotions - b1 = (ofs.forward)(pawns) & pos.empty_squares() & Rank8BB; + b1 = (C == WHITE ? pawns << 8 : pawns >> 8) & pos.empty_squares() & Rank8BB; while (b1) { sq = pop_1st_bit(&b1); @@ -725,7 +711,7 @@ namespace { int n = 0; // Underpromotion captures in the a1-h8 (a8-h1 for black) direction - b1 = ofs.forward_right(pawns) & ~FileABB & enemyPieces & ofs.Rank8BB; + b1 = (C == WHITE ? pawns << 9 : pawns >> 7) & ~FileABB & enemyPieces & ofs.Rank8BB; while (b1) { sq = pop_1st_bit(&b1); @@ -735,7 +721,7 @@ namespace { } // Underpromotion captures in the h1-a8 (h8-a1 for black) direction - b1 = ofs.forward_left(pawns) & ~FileHBB & enemyPieces & ofs.Rank8BB; + b1 = (C == WHITE ? pawns << 7 : pawns >> 9) & ~FileHBB & enemyPieces & ofs.Rank8BB; while (b1) { sq = pop_1st_bit(&b1); @@ -745,7 +731,7 @@ namespace { } // Single pawn pushes - b1 = ofs.forward(pawns) & emptySquares; + b1 = (C == WHITE ? pawns << 8 : pawns >> 8) & emptySquares; b2 = b1 & ofs.Rank8BB; while (b2) { @@ -762,7 +748,7 @@ namespace { } // Double pawn pushes - b2 = (ofs.forward(b1 & ofs.Rank3BB)) & emptySquares; + b2 = (C == WHITE ? (b1 & ofs.Rank3BB) << 8 : (b1 & ofs.Rank3BB) >> 8) & emptySquares; while (b2) { sq = pop_1st_bit(&b2); @@ -772,6 +758,107 @@ namespace { } + template + int generate_pawn_checks(const Position& pos, Bitboard dc, Square ksq, MoveStack* mlist, int n) + { + static const PawnOffsets ofs = (C == WHITE ? WhitePawnOffsets : BlackPawnOffsets); + + // Pawn moves which give 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. + Bitboard empty = pos.empty_squares(); + + // Find all friendly pawns not on the enemy king's file + Bitboard b1 = pos.pawns(pos.side_to_move()) & ~file_bb(ksq), b2, b3; + + // Discovered checks, single pawn pushes + b2 = b3 = (C == WHITE ? (b1 & dc) << 8 : (b1 & dc) >> 8) & ~ofs.Rank8BB & empty; + while (b3) + { + Square to = pop_1st_bit(&b3); + mlist[n++].move = make_move(to - ofs.DELTA_N, to); + } + + // Discovered checks, double pawn pushes + b3 = (C == WHITE ? (b2 & ofs.Rank3BB) << 8 : (b2 & ofs.Rank3BB) >> 8) & empty; + while (b3) + { + Square to = pop_1st_bit(&b3); + mlist[n++].move = make_move(to - ofs.DELTA_N - ofs.DELTA_N, to); + } + + // Direct checks. These are possible only for pawns on neighboring files + // of the enemy king + + b1 &= (~dc & neighboring_files_bb(ksq)); // FIXME why ~dc ?? + + // Direct checks, single pawn pushes + b2 = (C == WHITE ? b1 << 8 : b1 >> 8) & empty; + b3 = b2 & pos.pawn_attacks(ofs.them, ksq); + while (b3) + { + Square to = pop_1st_bit(&b3); + mlist[n++].move = make_move(to - ofs.DELTA_N, to); + } + + // Direct checks, double pawn pushes + b3 = (C == WHITE ? (b2 & ofs.Rank3BB) << 8 : (b2 & ofs.Rank3BB) >> 8) + & empty + & pos.pawn_attacks(ofs.them, ksq); + + while (b3) + { + Square to = pop_1st_bit(&b3); + mlist[n++].move = make_move(to - ofs.DELTA_N - ofs.DELTA_N, to); + } + return n; + } + + template + int generate_pawn_blocking_evasions(const Position& pos, Bitboard not_pinned, + Bitboard blockSquares, MoveStack* mlist, int n) { + + static const PawnOffsets ofs = (C == WHITE ? WhitePawnOffsets : BlackPawnOffsets); + + // Find non-pinned pawns + Bitboard b1 = pos.pawns(ofs.us) & not_pinned; + + // Single pawn pushes. We don't have to AND with empty squares here, + // because the blocking squares will always be empty. + Bitboard b2 = (C == WHITE ? b1 << 8 : b1 >> 8) & blockSquares; + while (b2) + { + Square to = pop_1st_bit(&b2); + + assert(pos.piece_on(to) == EMPTY); + + if (square_rank(to) == ofs.RANK_8) + { + mlist[n++].move = make_promotion_move(to - ofs.DELTA_N, to, QUEEN); + mlist[n++].move = make_promotion_move(to - ofs.DELTA_N, to, ROOK); + mlist[n++].move = make_promotion_move(to - ofs.DELTA_N, to, BISHOP); + mlist[n++].move = make_promotion_move(to - ofs.DELTA_N, to, KNIGHT); + } else + mlist[n++].move = make_move(to - ofs.DELTA_N, to); + } + + // Double pawn pushes + b2 = (C == WHITE ? b1 << 8 : b1 >> 8) & pos.empty_squares() & ofs.Rank3BB; + b2 = (C == WHITE ? b2 << 8 : b2 >> 8) & blockSquares;; + while (b2) + { + Square to = pop_1st_bit(&b2); + + assert(pos.piece_on(to) == EMPTY); + assert(ofs.us != WHITE || square_rank(to) == RANK_4); + assert(ofs.us != BLACK || square_rank(to) == RANK_5); + + mlist[n++].move = make_move(to - ofs.DELTA_N - ofs.DELTA_N, to); + } + return n; + } + + int generate_castle_moves(const Position &pos, MoveStack *mlist, Color us) { int n = 0; @@ -836,101 +923,4 @@ namespace { } return n; } - - - template - int generate_pawn_checks(const Position& pos, Bitboard dc, Square ksq, MoveStack* mlist, int n) - { - static const PawnOffsets ofs = (C == WHITE ? WhitePawnOffsets : BlackPawnOffsets); - - // Pawn moves which give 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. - Bitboard empty = pos.empty_squares(); - - // Find all friendly pawns not on the enemy king's file - Bitboard b1 = pos.pawns(pos.side_to_move()) & ~file_bb(ksq), b2, b3; - - // Discovered checks, single pawn pushes - b2 = b3 = (ofs.forward)(b1 & dc) & ~ofs.Rank8BB & empty; - while (b3) - { - Square to = pop_1st_bit(&b3); - mlist[n++].move = make_move(to - ofs.DELTA_N, to); - } - - // Discovered checks, double pawn pushes - b3 = (ofs.forward)(b2 & ofs.Rank3BB) & empty; - while (b3) - { - Square to = pop_1st_bit(&b3); - mlist[n++].move = make_move(to - ofs.DELTA_N - ofs.DELTA_N, to); - } - - // Direct checks. These are possible only for pawns on neighboring files - // of the enemy king - - b1 &= (~dc & neighboring_files_bb(ksq)); // FIXME why ~dc ?? - - // Direct checks, single pawn pushes - b2 = (ofs.forward)(b1) & empty; - b3 = b2 & pos.pawn_attacks(ofs.them, ksq); - while (b3) - { - Square to = pop_1st_bit(&b3); - mlist[n++].move = make_move(to - ofs.DELTA_N, to); - } - - // Direct checks, double pawn pushes - b3 = (ofs.forward)(b2 & ofs.Rank3BB) & empty & pos.pawn_attacks(ofs.them, ksq); - while (b3) - { - Square to = pop_1st_bit(&b3); - mlist[n++].move = make_move(to - ofs.DELTA_N - ofs.DELTA_N, to); - } - return n; - } - - template - int generate_pawn_blocking_evasions(const Position& pos, Bitboard not_pinned, - Bitboard blockSquares, MoveStack* mlist, int n) { - - static const PawnOffsets ofs = (C == WHITE ? WhitePawnOffsets : BlackPawnOffsets); - - // Find non-pinned pawns - Bitboard b1 = pos.pawns(ofs.us) & not_pinned; - - // Single pawn pushes. We don't have to AND with empty squares here, - // because the blocking squares will always be empty. - Bitboard b2 = (ofs.forward)(b1) & blockSquares; - while (b2) - { - Square to = pop_1st_bit(&b2); - - assert(pos.piece_on(to) == EMPTY); - - if (square_rank(to) == ofs.RANK_8) - { - mlist[n++].move = make_promotion_move(to - ofs.DELTA_N, to, QUEEN); - mlist[n++].move = make_promotion_move(to - ofs.DELTA_N, to, ROOK); - mlist[n++].move = make_promotion_move(to - ofs.DELTA_N, to, BISHOP); - mlist[n++].move = make_promotion_move(to - ofs.DELTA_N, to, KNIGHT); - } else - mlist[n++].move = make_move(to - ofs.DELTA_N, to); - } - - // Double pawn pushes - b2 = (ofs.forward)((ofs.forward)(b1) & pos.empty_squares() & ofs.Rank3BB) & blockSquares; - while (b2) - { - Square to = pop_1st_bit(&b2); - - assert(pos.piece_on(to) == EMPTY); - assert(ofs.us != WHITE || square_rank(to) == RANK_4); - assert(ofs.us != BLACK || square_rank(to) == RANK_5); - - mlist[n++].move = make_move(to - ofs.DELTA_N - ofs.DELTA_N, to); - } - return n; - } }