: generate_pawn_moves<BLACK, Type>(p, m));
}
- // Template generate_piece_checks with specializations
+ // Templates for non-capture checks generation
+
+ template<PieceType Piece>
+ MoveStack* generate_discovered_checks(const Position& pos, Square from, MoveStack* mlist);
+
template<PieceType>
- MoveStack* generate_piece_checks(const Position&, MoveStack*, Color, Bitboard, Square);
+ MoveStack* generate_direct_checks(const Position&, MoveStack*, Color, Bitboard, Square);
template<>
- inline MoveStack* generate_piece_checks<PAWN>(const Position& p, MoveStack* m, Color us, Bitboard dc, Square ksq) {
+ inline MoveStack* generate_direct_checks<PAWN>(const Position& p, MoveStack* m, Color us, Bitboard dc, Square ksq) {
return (us == WHITE ? generate_pawn_moves<WHITE, CHECK>(p, m, dc, ksq)
: generate_pawn_moves<BLACK, CHECK>(p, m, dc, ksq));
assert(pos.piece_on(ksq) == piece_of_color_and_type(opposite_color(us), KING));
- // Pieces moves
- mlist = generate_piece_checks<PAWN>(pos, mlist, us, dc, ksq);
- mlist = generate_piece_checks<KNIGHT>(pos, mlist, us, dc, ksq);
- mlist = generate_piece_checks<BISHOP>(pos, mlist, us, dc, ksq);
- mlist = generate_piece_checks<ROOK>(pos, mlist, us, dc, ksq);
- mlist = generate_piece_checks<QUEEN>(pos, mlist, us, dc, ksq);
- mlist = generate_piece_checks<KING>(pos, mlist, us, dc, ksq);
+ // Discovered non-capture checks
+ Bitboard b = dc;
+ while (b)
+ {
+ Square from = pop_1st_bit(&b);
+ switch (pos.type_of_piece_on(from))
+ {
+ case PAWN: /* Will be generated togheter with pawns direct checks */ break;
+ case KNIGHT: mlist = generate_discovered_checks<KNIGHT>(pos, from, mlist); break;
+ case BISHOP: mlist = generate_discovered_checks<BISHOP>(pos, from, mlist); break;
+ case ROOK: mlist = generate_discovered_checks<ROOK>(pos, from, mlist); break;
+ case KING: mlist = generate_discovered_checks<KING>(pos, from, mlist); break;
+ default: assert(false); break;
+ }
+ }
+
+ // Direct non-capture checks
+ mlist = generate_direct_checks<PAWN>(pos, mlist, us, dc, ksq);
+ mlist = generate_direct_checks<KNIGHT>(pos, mlist, us, dc, ksq);
+ mlist = generate_direct_checks<BISHOP>(pos, mlist, us, dc, ksq);
+ mlist = generate_direct_checks<ROOK>(pos, mlist, us, dc, ksq);
+ mlist = generate_direct_checks<QUEEN>(pos, mlist, us, dc, ksq);
// Castling moves that give check. Very rare but nice to have!
if ( pos.can_castle_queenside(us)
// Single pawn pushes
b1 = move_pawns<Us, DELTA_N>(pawns) & emptySquares & ~TRank8BB;
b2 = (Type == CHECK ? (b1 & pos.attacks_from<PAWN>(ksq, Them)) | dcPawns1 :
- (Type == EVASION ? b1 & blockSquares : b1));
+ (Type == EVASION ? b1 & blockSquares : b1));
SERIALIZE_MOVES_D(b2, -TDELTA_N);
// Double pawn pushes
b1 = move_pawns<Us, DELTA_N>(b1 & TRank3BB) & emptySquares;
b2 = (Type == CHECK ? (b1 & pos.attacks_from<PAWN>(ksq, Them)) | dcPawns2 :
- (Type == EVASION ? b1 & blockSquares : b1));
+ (Type == EVASION ? b1 & blockSquares : b1));
SERIALIZE_MOVES_D(b2, -TDELTA_N -TDELTA_N);
}
else if (pos.ep_square() != SQ_NONE) // En passant captures
}
template<PieceType Piece>
- MoveStack* generate_piece_checks(const Position& pos, MoveStack* mlist, Color us,
+ MoveStack* generate_discovered_checks(const Position& pos, Square from, MoveStack* mlist) {
+
+ assert(Piece != QUEEN);
+
+ Bitboard b = pos.attacks_from<Piece>(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<PieceType Piece>
+ MoveStack* generate_direct_checks(const Position& pos, MoveStack* mlist, Color us,
Bitboard dc, Square ksq) {
+ assert(Piece != KING);
- Bitboard target = pos.pieces(Piece, us);
+ Square from;
+ Bitboard checkSqs;
+ const Square* ptr = pos.piece_list_begin(us, Piece);
- // Discovered non-capture checks
- Bitboard b = target & dc;
+ if ((from = *ptr++) == SQ_NONE)
+ return mlist;
- assert(Piece != QUEEN || !b);
+ checkSqs = pos.attacks_from<Piece>(ksq) & pos.empty_squares();
- while (b)
+ do
{
- Square from = pop_1st_bit(&b);
- Bitboard bb = pos.attacks_from<Piece>(from) & pos.empty_squares();
- if (Piece == KING)
- bb &= ~QueenPseudoAttacks[ksq];
+ 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;
+ Bitboard bb = pos.attacks_from<Piece>(from) & checkSqs;
SERIALIZE_MOVES(bb);
- }
- // Direct non-capture checks
- b = target & ~dc;
- Bitboard checkSqs = pos.attacks_from<Piece>(ksq) & pos.empty_squares();
- if (Piece != KING && checkSqs)
- {
- while (b)
- {
- Square from = pop_1st_bit(&b);
- if ( (Piece == QUEEN && !(QueenPseudoAttacks[from] & checkSqs))
- || (Piece == ROOK && !(RookPseudoAttacks[from] & checkSqs))
- || (Piece == BISHOP && !(BishopPseudoAttacks[from] & checkSqs)))
- continue;
-
- Bitboard bb = pos.attacks_from<Piece>(from) & checkSqs;
- SERIALIZE_MOVES(bb);
- }
- }
+ } while ((from = *ptr++) != SQ_NONE);
+
return mlist;
}