/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2020 The Stockfish developers (see AUTHORS file)
+ Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
// Add pawn pushes 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. Note that a possible discovery check
+ // don't generate captures. Note that a possible discovered check
// promotion has been already generated amongst the captures.
Bitboard dcCandidateQuiets = pos.blockers_for_king(Them) & pawnsNotOn7;
if (dcCandidateQuiets)
moveList = make_promotions<Type, Up >(moveList, pop_lsb(&b3), ksq);
}
- // Standard and en-passant captures
+ // Standard and en passant captures
if (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS)
{
Bitboard b1 = shift<UpRight>(pawnsNotOn7) & enemies;
{
assert(rank_of(pos.ep_square()) == relative_rank(Us, RANK_6));
- // An en passant capture can be an evasion only if the checking piece
- // is the double pushed pawn and so is in the target. Otherwise this
- // is a discovery check and we are forced to do otherwise.
- if (Type == EVASIONS && !(target & (pos.ep_square() - Up)))
+ // An en passant capture cannot resolve a discovered check.
+ if (Type == EVASIONS && (target & (pos.ep_square() + Up)))
return moveList;
b1 = pawnsNotOn7 & pawn_attacks_bb(Them, pos.ep_square());
assert(b1);
while (b1)
- *moveList++ = make<ENPASSANT>(pop_lsb(&b1), pos.ep_square());
+ *moveList++ = make<EN_PASSANT>(pop_lsb(&b1), pos.ep_square());
}
}
}
- template<Color Us, PieceType Pt, bool Checks>
- ExtMove* generate_moves(const Position& pos, ExtMove* moveList, Bitboard target) {
+ template<PieceType Pt, bool Checks>
+ ExtMove* generate_moves(const Position& pos, ExtMove* moveList, Bitboard piecesToMove, Bitboard target) {
static_assert(Pt != KING && Pt != PAWN, "Unsupported piece type in generate_moves()");
- const Square* pl = pos.squares<Pt>(Us);
+ Bitboard bb = piecesToMove & pos.pieces(Pt);
- for (Square from = *pl; from != SQ_NONE; from = *++pl)
- {
- if (Checks)
- {
- if ( (Pt == BISHOP || Pt == ROOK || Pt == QUEEN)
- && !(attacks_bb<Pt>(from) & target & pos.check_squares(Pt)))
- continue;
+ if (!bb)
+ return moveList;
- if (pos.blockers_for_king(~Us) & from)
- continue;
- }
+ [[maybe_unused]] const Bitboard checkSquares = pos.check_squares(Pt);
- Bitboard b = attacks_bb<Pt>(from, pos.pieces()) & target;
+ while (bb) {
+ Square from = pop_lsb(&bb);
- if (Checks)
- b &= pos.check_squares(Pt);
+ Bitboard b = attacks_bb<Pt>(from, pos.pieces()) & target;
+ if constexpr (Checks)
+ b &= checkSquares;
while (b)
*moveList++ = make_move(from, pop_lsb(&b));
template<Color Us, GenType Type>
ExtMove* generate_all(const Position& pos, ExtMove* moveList) {
+
+ static_assert(Type != LEGAL, "Unsupported type in generate_all()");
+
constexpr bool Checks = Type == QUIET_CHECKS; // Reduce template instantations
- Bitboard target;
+ Bitboard target, piecesToMove = pos.pieces(Us);
+
+ if(Type == QUIET_CHECKS)
+ piecesToMove &= ~pos.blockers_for_king(~Us);
switch (Type)
{
case NON_EVASIONS:
target = ~pos.pieces(Us);
break;
- default:
- static_assert(true, "Unsupported type in generate_all()");
}
moveList = generate_pawn_moves<Us, Type>(pos, moveList, target);
- moveList = generate_moves<Us, KNIGHT, Checks>(pos, moveList, target);
- moveList = generate_moves<Us, BISHOP, Checks>(pos, moveList, target);
- moveList = generate_moves<Us, ROOK, Checks>(pos, moveList, target);
- moveList = generate_moves<Us, QUEEN, Checks>(pos, moveList, target);
+ moveList = generate_moves<KNIGHT, Checks>(pos, moveList, piecesToMove, target);
+ moveList = generate_moves<BISHOP, Checks>(pos, moveList, piecesToMove, target);
+ moveList = generate_moves< ROOK, Checks>(pos, moveList, piecesToMove, target);
+ moveList = generate_moves< QUEEN, Checks>(pos, moveList, piecesToMove, target);
if (Type != QUIET_CHECKS && Type != EVASIONS)
{
*moveList++ = make_move(ksq, pop_lsb(&b));
if ((Type != CAPTURES) && pos.can_castle(Us & ANY_CASTLING))
- for(CastlingRights cr : { Us & KING_SIDE, Us & QUEEN_SIDE } )
+ for (CastlingRights cr : { Us & KING_SIDE, Us & QUEEN_SIDE } )
if (!pos.castling_impeded(cr) && pos.can_castle(cr))
*moveList++ = make<CASTLING>(ksq, pos.castling_rook_square(cr));
}
moveList = pos.checkers() ? generate<EVASIONS >(pos, moveList)
: generate<NON_EVASIONS>(pos, moveList);
while (cur != moveList)
- if ( (pinned || from_sq(*cur) == ksq || type_of(*cur) == ENPASSANT)
+ if ( (pinned || from_sq(*cur) == ksq || type_of(*cur) == EN_PASSANT)
&& !pos.legal(*cur))
*cur = (--moveList)->move;
else