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Start to space inflate position.cpp
It's a big file! Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
parent
2aebf8eb55
commit
d155cd88d1
2 changed files with 166 additions and 170 deletions
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@ -403,6 +403,7 @@ Move generate_move_if_legal(const Position& pos, Move m, Bitboard pinned) {
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assert(pos.is_ok());
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assert(!pos.is_check());
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assert(move_is_ok(m));
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assert(pinned == pos.pinned_pieces(pos.side_to_move()));
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Color us = pos.side_to_move();
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Color them = opposite_color(us);
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335
src/position.cpp
335
src/position.cpp
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@ -292,6 +292,7 @@ void Position::print() const {
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/// Position::copy() creates a copy of the input position.
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void Position::copy(const Position &pos) {
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memcpy(this, &pos, sizeof(Position));
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}
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@ -346,7 +347,6 @@ Bitboard Position::hidden_checks(Color c, Square ksq) const {
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else
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pinners &= bishop_attacks_bb(ksq, occupied_squares() ^ candidate_pinned);
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// Finally for each pinner find the corresponding pinned piece (if same color of king)
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// or discovery checker (if opposite color) among the candidates.
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while (pinners)
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@ -363,12 +363,12 @@ Bitboard Position::hidden_checks(Color c, Square ksq) const {
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/// given square.
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bool Position::square_is_attacked(Square s, Color c) const {
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return
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(pawn_attacks(opposite_color(c), s) & pawns(c)) ||
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(piece_attacks<KNIGHT>(s) & knights(c)) ||
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(piece_attacks<KING>(s) & kings(c)) ||
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(piece_attacks<ROOK>(s) & rooks_and_queens(c)) ||
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(piece_attacks<BISHOP>(s) & bishops_and_queens(c));
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return (pawn_attacks(opposite_color(c), s) & pawns(c))
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|| (piece_attacks<KNIGHT>(s) & knights(c))
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|| (piece_attacks<KING>(s) & kings(c))
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|| (piece_attacks<ROOK>(s) & rooks_and_queens(c))
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|| (piece_attacks<BISHOP>(s) & bishops_and_queens(c));
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}
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@ -378,16 +378,17 @@ bool Position::square_is_attacked(Square s, Color c) const {
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/// attackers for one side.
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Bitboard Position::attacks_to(Square s) const {
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return
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(pawn_attacks(BLACK, s) & pawns(WHITE)) |
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(pawn_attacks(WHITE, s) & pawns(BLACK)) |
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(piece_attacks<KNIGHT>(s) & pieces_of_type(KNIGHT)) |
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(piece_attacks<ROOK>(s) & rooks_and_queens()) |
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(piece_attacks<BISHOP>(s) & bishops_and_queens()) |
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(piece_attacks<KING>(s) & pieces_of_type(KING));
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return (pawn_attacks(BLACK, s) & pawns(WHITE))
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| (pawn_attacks(WHITE, s) & pawns(BLACK))
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| (piece_attacks<KNIGHT>(s) & pieces_of_type(KNIGHT))
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| (piece_attacks<ROOK>(s) & rooks_and_queens())
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| (piece_attacks<BISHOP>(s) & bishops_and_queens())
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| (piece_attacks<KING>(s) & pieces_of_type(KING));
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}
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Bitboard Position::attacks_to(Square s, Color c) const {
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return attacks_to(s) & pieces_of_color(c);
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}
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@ -396,20 +397,49 @@ Bitboard Position::attacks_to(Square s, Color c) const {
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/// attacks square t.
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bool Position::piece_attacks_square(Square f, Square t) const {
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assert(square_is_ok(f));
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assert(square_is_ok(t));
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switch(piece_on(f)) {
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case WP: return pawn_attacks_square(WHITE, f, t);
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case BP: return pawn_attacks_square(BLACK, f, t);
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switch (piece_on(f))
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{
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case WP: return pawn_attacks_square(WHITE, f, t);
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case BP: return pawn_attacks_square(BLACK, f, t);
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case WN: case BN: return piece_attacks_square<KNIGHT>(f, t);
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case WB: case BB: return piece_attacks_square<BISHOP>(f, t);
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case WR: case BR: return piece_attacks_square<ROOK>(f, t);
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case WQ: case BQ: return piece_attacks_square<QUEEN>(f, t);
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case WK: case BK: return piece_attacks_square<KING>(f, t);
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default: return false;
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default: return false;
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}
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return false;
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}
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/// Position::move_attacks_square() tests whether a move from the current
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/// position attacks a given square. Only attacks by the moving piece are
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/// considered; the function does not handle X-ray attacks.
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bool Position::move_attacks_square(Move m, Square s) const {
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assert(move_is_ok(m));
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assert(square_is_ok(s));
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Square f = move_from(m), t = move_to(m);
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assert(square_is_occupied(f));
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switch (piece_on(f))
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{
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case WP: return pawn_attacks_square(WHITE, t, s);
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case BP: return pawn_attacks_square(BLACK, t, s);
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case WN: case BN: return piece_attacks_square<KNIGHT>(t, s);
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case WB: case BB: return piece_attacks_square<BISHOP>(t, s);
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case WR: case BR: return piece_attacks_square<ROOK>(t, s);
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case WQ: case BQ: return piece_attacks_square<QUEEN>(t, s);
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case WK: case BK: return piece_attacks_square<KING>(t, s);
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default: assert(false);
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}
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return false;
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}
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@ -421,23 +451,24 @@ bool Position::piece_attacks_square(Square f, Square t) const {
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/// played, like in non-bitboard versions of Glaurung.
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void Position::find_checkers() {
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checkersBB = attacks_to(king_square(side_to_move()),
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opposite_color(side_to_move()));
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checkersBB = attacks_to(king_square(side_to_move()),opposite_color(side_to_move()));
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}
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/// Position::move_is_legal() tests whether a pseudo-legal move is legal.
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/// There are two versions of this function: One which takes only a
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/// move as input, and one which takes a move and a bitboard of pinned
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/// pieces. The latter function is faster, and should always be preferred
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/// pieces. The latter function is faster, and should always be preferred
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/// when a pinned piece bitboard has already been computed.
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bool Position::move_is_legal(Move m) const {
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return move_is_legal(m, pinned_pieces(side_to_move()));
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}
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bool Position::move_is_legal(Move m, Bitboard pinned) const {
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Color us, them;
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Square ksq, from;
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@ -447,14 +478,15 @@ bool Position::move_is_legal(Move m, Bitboard pinned) const {
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// If we're in check, all pseudo-legal moves are legal, because our
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// check evasion generator only generates true legal moves.
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if(is_check()) return true;
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if (is_check())
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return true;
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// Castling moves are checked for legality during move generation.
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if(move_is_castle(m)) return true;
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if (move_is_castle(m))
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return true;
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us = side_to_move();
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them = opposite_color(us);
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from = move_from(m);
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ksq = king_square(us);
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@ -463,33 +495,36 @@ bool Position::move_is_legal(Move m, Bitboard pinned) const {
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// En passant captures are a tricky special case. Because they are
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// rather uncommon, we do it simply by testing whether the king is attacked
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// after the move is made:
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if(move_is_ep(m)) {
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Square to = move_to(m);
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Square capsq = make_square(square_file(to), square_rank(from));
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Bitboard b = occupied_squares();
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// after the move is made
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if (move_is_ep(m))
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{
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Square to = move_to(m);
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Square capsq = make_square(square_file(to), square_rank(from));
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Bitboard b = occupied_squares();
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assert(to == ep_square());
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assert(piece_on(from) == pawn_of_color(us));
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assert(piece_on(capsq) == pawn_of_color(them));
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assert(piece_on(to) == EMPTY);
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assert(to == ep_square());
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assert(piece_on(from) == pawn_of_color(us));
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assert(piece_on(capsq) == pawn_of_color(them));
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assert(piece_on(to) == EMPTY);
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clear_bit(&b, from); clear_bit(&b, capsq); set_bit(&b, to);
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return
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(!(rook_attacks_bb(ksq, b) & rooks_and_queens(them)) &&
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!(bishop_attacks_bb(ksq, b) & bishops_and_queens(them)));
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clear_bit(&b, from);
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clear_bit(&b, capsq);
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set_bit(&b, to);
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return !(rook_attacks_bb(ksq, b) & rooks_and_queens(them))
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&& !(bishop_attacks_bb(ksq, b) & bishops_and_queens(them));
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}
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// If the moving piece is a king, check whether the destination
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// square is attacked by the opponent.
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if(from == ksq) return !(square_is_attacked(move_to(m), them));
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if (from == ksq)
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return !(square_is_attacked(move_to(m), them));
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// A non-king move is legal if and only if it is not pinned or it
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// is moving along the ray towards or away from the king.
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if(!bit_is_set(pinned, from)) return true;
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if(direction_between_squares(from, ksq) ==
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direction_between_squares(move_to(m), ksq))
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return true;
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if ( !bit_is_set(pinned, from)
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|| (direction_between_squares(from, ksq) == direction_between_squares(move_to(m), ksq)))
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return true;
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return false;
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}
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@ -502,138 +537,126 @@ bool Position::move_is_legal(Move m, Bitboard pinned) const {
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/// when a discovered check candidates bitboard has already been computed.
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bool Position::move_is_check(Move m) const {
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Bitboard dc = discovered_check_candidates(side_to_move());
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return move_is_check(m, dc);
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}
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bool Position::move_is_check(Move m, Bitboard dcCandidates) const {
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Color us, them;
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Square ksq, from, to;
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assert(is_ok());
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assert(move_is_ok(m));
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assert(dcCandidates ==
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discovered_check_candidates(side_to_move()));
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assert(dcCandidates == discovered_check_candidates(side_to_move()));
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us = side_to_move();
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them = opposite_color(us);
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from = move_from(m);
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to = move_to(m);
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ksq = king_square(them);
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assert(color_of_piece_on(from) == us);
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assert(piece_on(ksq) == king_of_color(them));
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// Proceed according to the type of the moving piece:
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switch(type_of_piece_on(from)) {
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// Proceed according to the type of the moving piece
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switch (type_of_piece_on(from))
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{
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case PAWN:
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// Normal check?
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if(bit_is_set(pawn_attacks(them, ksq), to))
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return true;
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// Discovered check?
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else if(bit_is_set(dcCandidates, from) &&
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direction_between_squares(from, ksq) !=
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direction_between_squares(to, ksq))
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return true;
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// Promotion with check?
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else if(move_promotion(m)) {
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Bitboard b = occupied_squares();
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clear_bit(&b, from);
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if (bit_is_set(pawn_attacks(them, ksq), to)) // Normal check?
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return true;
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if ( bit_is_set(dcCandidates, from) // Discovered check?
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&& (direction_between_squares(from, ksq) != direction_between_squares(to, ksq)))
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return true;
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if (move_promotion(m)) // Promotion with check?
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{
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Bitboard b = occupied_squares();
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clear_bit(&b, from);
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switch(move_promotion(m)) {
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case KNIGHT:
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return piece_attacks_square<KNIGHT>(to, ksq);
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case BISHOP:
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return bit_is_set(bishop_attacks_bb(to, b), ksq);
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case ROOK:
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return bit_is_set(rook_attacks_bb(to, b), ksq);
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case QUEEN:
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return bit_is_set(queen_attacks_bb(to, b), ksq);
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default:
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assert(false);
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switch (move_promotion(m))
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{
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case KNIGHT:
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return bit_is_set(piece_attacks<KNIGHT>(to), ksq);
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case BISHOP:
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return bit_is_set(bishop_attacks_bb(to, b), ksq);
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case ROOK:
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return bit_is_set(rook_attacks_bb(to, b), ksq);
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case QUEEN:
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return bit_is_set(queen_attacks_bb(to, b), ksq);
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default:
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assert(false);
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}
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}
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}
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// En passant capture with check? We have already handled the case
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// of direct checks and ordinary discovered check, the only case we
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// need to handle is the unusual case of a discovered check through the
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// captured pawn.
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else if(move_is_ep(m)) {
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Square capsq = make_square(square_file(to), square_rank(from));
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Bitboard b = occupied_squares();
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// En passant capture with check? We have already handled the case
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// of direct checks and ordinary discovered check, the only case we
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// need to handle is the unusual case of a discovered check through the
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// captured pawn.
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else if (move_is_ep(m))
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{
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Square capsq = make_square(square_file(to), square_rank(from));
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Bitboard b = occupied_squares();
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clear_bit(&b, from);
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clear_bit(&b, capsq);
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set_bit(&b, to);
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return (rook_attacks_bb(ksq, b) & rooks_and_queens(us))
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||(bishop_attacks_bb(ksq, b) & bishops_and_queens(us));
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}
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return false;
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clear_bit(&b, from); clear_bit(&b, capsq); set_bit(&b, to);
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return
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((rook_attacks_bb(ksq, b) & rooks_and_queens(us)) ||
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(bishop_attacks_bb(ksq, b) & bishops_and_queens(us)));
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}
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return false;
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case KNIGHT:
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// Discovered check?
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if(bit_is_set(dcCandidates, from))
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return true;
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// Normal check?
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else
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return bit_is_set(piece_attacks<KNIGHT>(ksq), to);
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case KNIGHT:
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return bit_is_set(dcCandidates, from) // Discovered check?
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|| bit_is_set(piece_attacks<KNIGHT>(ksq), to); // Normal check?
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case BISHOP:
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// Discovered check?
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if(bit_is_set(dcCandidates, from))
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return true;
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// Normal check?
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else
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return bit_is_set(piece_attacks<BISHOP>(ksq), to);
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return bit_is_set(dcCandidates, from) // Discovered check?
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|| bit_is_set(piece_attacks<BISHOP>(ksq), to); // Normal check?
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case ROOK:
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// Discovered check?
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if(bit_is_set(dcCandidates, from))
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return true;
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// Normal check?
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else
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return bit_is_set(piece_attacks<ROOK>(ksq), to);
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return bit_is_set(dcCandidates, from) // Discovered check?
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|| bit_is_set(piece_attacks<ROOK>(ksq), to); // Normal check?
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case QUEEN:
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// Discovered checks are impossible!
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assert(!bit_is_set(dcCandidates, from));
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// Normal check?
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return bit_is_set(piece_attacks<QUEEN>(ksq), to);
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// Discovered checks are impossible!
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assert(!bit_is_set(dcCandidates, from));
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return bit_is_set(piece_attacks<QUEEN>(ksq), to); // Normal check?
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case KING:
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// Discovered check?
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if(bit_is_set(dcCandidates, from) &&
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direction_between_squares(from, ksq) !=
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direction_between_squares(to, ksq))
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return true;
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// Castling with check?
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if(move_is_castle(m)) {
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Square kfrom, kto, rfrom, rto;
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Bitboard b = occupied_squares();
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// Discovered check?
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if ( bit_is_set(dcCandidates, from)
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&& (direction_between_squares(from, ksq) != direction_between_squares(to, ksq)))
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return true;
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kfrom = from;
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rfrom = to;
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if(rfrom > kfrom) {
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kto = relative_square(us, SQ_G1);
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rto = relative_square(us, SQ_F1);
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// Castling with check?
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if (move_is_castle(m))
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{
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Square kfrom, kto, rfrom, rto;
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Bitboard b = occupied_squares();
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kfrom = from;
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rfrom = to;
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if (rfrom > kfrom)
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{
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kto = relative_square(us, SQ_G1);
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rto = relative_square(us, SQ_F1);
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} else {
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kto = relative_square(us, SQ_C1);
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rto = relative_square(us, SQ_D1);
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}
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clear_bit(&b, kfrom);
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clear_bit(&b, rfrom);
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set_bit(&b, rto);
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set_bit(&b, kto);
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return bit_is_set(rook_attacks_bb(rto, b), ksq);
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}
|
||||
else {
|
||||
kto = relative_square(us, SQ_C1);
|
||||
rto = relative_square(us, SQ_D1);
|
||||
}
|
||||
|
||||
clear_bit(&b, kfrom); clear_bit(&b, rfrom);
|
||||
set_bit(&b, rto); set_bit(&b, kto);
|
||||
|
||||
return bit_is_set(rook_attacks_bb(rto, b), ksq);
|
||||
}
|
||||
|
||||
return false;
|
||||
return false;
|
||||
|
||||
default:
|
||||
assert(false);
|
||||
return false;
|
||||
assert(false);
|
||||
}
|
||||
|
||||
assert(false);
|
||||
return false;
|
||||
}
|
||||
|
|
@ -643,40 +666,12 @@ bool Position::move_is_check(Move m, Bitboard dcCandidates) const {
|
|||
/// position is a capture.
|
||||
|
||||
bool Position::move_is_capture(Move m) const {
|
||||
return
|
||||
color_of_piece_on(move_to(m)) == opposite_color(side_to_move())
|
||||
|| move_is_ep(m);
|
||||
|
||||
return color_of_piece_on(move_to(m)) == opposite_color(side_to_move())
|
||||
|| move_is_ep(m);
|
||||
}
|
||||
|
||||
|
||||
/// Position::move_attacks_square() tests whether a move from the current
|
||||
/// position attacks a given square. Only attacks by the moving piece are
|
||||
/// considered; the function does not handle X-ray attacks.
|
||||
|
||||
bool Position::move_attacks_square(Move m, Square s) const {
|
||||
assert(move_is_ok(m));
|
||||
assert(square_is_ok(s));
|
||||
|
||||
Square f = move_from(m), t = move_to(m);
|
||||
|
||||
assert(square_is_occupied(f));
|
||||
|
||||
switch(piece_on(f)) {
|
||||
case WP: return pawn_attacks_square(WHITE, t, s);
|
||||
case BP: return pawn_attacks_square(BLACK, t, s);
|
||||
case WN: case BN: return piece_attacks_square<KNIGHT>(t, s);
|
||||
case WB: case BB: return piece_attacks_square<BISHOP>(t, s);
|
||||
case WR: case BR: return piece_attacks_square<ROOK>(t, s);
|
||||
case WQ: case BQ: return piece_attacks_square<QUEEN>(t, s);
|
||||
case WK: case BK: return piece_attacks_square<KING>(t, s);
|
||||
default: assert(false);
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
|
||||
|
||||
/// Position::backup() is called when making a move. All information
|
||||
/// necessary to restore the position when the move is later unmade
|
||||
/// is saved to an UndoInfo object. The function Position::restore
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue