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Use update_checkers<>() also for PAWN

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-02-12 12:26:23 +01:00
parent 1d2247aea3
commit a188a047ab
2 changed files with 25 additions and 22 deletions
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42
src/position.cpp
View file

@ -317,6 +317,25 @@ void Position::copy(const Position &pos) {
} }
/// Position::update_checkers() updates checkers info, used in do_move()
template<PieceType Piece>
inline void Position::update_checkers(Bitboard* pCheckersBB, Square ksq, Square from,
Square to, Bitboard dcCandidates) {
if (Piece != KING && bit_is_set(piece_attacks<Piece>(ksq), to))
set_bit(pCheckersBB, to);
if (Piece != QUEEN && bit_is_set(dcCandidates, from))
{
if (Piece != ROOK)
(*pCheckersBB) |= (piece_attacks<ROOK>(ksq) & rooks_and_queens(side_to_move()));
if (Piece != BISHOP)
(*pCheckersBB) |= (piece_attacks<BISHOP>(ksq) & bishops_and_queens(side_to_move()));
}
}
/// Position:pinned_pieces() returns a bitboard of all pinned (against the /// Position:pinned_pieces() returns a bitboard of all pinned (against the
/// king) pieces for the given color. /// king) pieces for the given color.
Bitboard Position::pinned_pieces(Color c) const { Bitboard Position::pinned_pieces(Color c) const {
@ -710,22 +729,6 @@ void Position::restore(const UndoInfo& u) {
// u.capture is restored in undo_move() // u.capture is restored in undo_move()
} }
template<PieceType Piece>
inline void Position::update_checkers(Bitboard* pCheckersBB, Square ksq, Square from, Square to, Bitboard dcCandidates) {
if (Piece != KING && bit_is_set(piece_attacks<Piece>(ksq), to))
set_bit(pCheckersBB, to);
if (Piece != QUEEN && bit_is_set(dcCandidates, from))
{
if (Piece != ROOK)
(*pCheckersBB) |= (piece_attacks<ROOK>(ksq) & rooks_and_queens(side_to_move()));
if (Piece != BISHOP)
(*pCheckersBB) |= (piece_attacks<BISHOP>(ksq) & bishops_and_queens(side_to_move()));
}
}
/// Position::do_move() makes a move, and backs up all information necessary /// Position::do_move() makes a move, and backs up all information necessary
/// to undo the move to an UndoInfo object. The move is assumed to be legal. /// to undo the move to an UndoInfo object. The move is assumed to be legal.
/// Pseudo-legal moves should be filtered out before this function is called. /// Pseudo-legal moves should be filtered out before this function is called.
@ -849,12 +852,7 @@ void Position::do_move(Move m, UndoInfo& u, Bitboard dcCandidates) {
switch (piece) switch (piece)
{ {
case PAWN: case PAWN:
if (bit_is_set(pawn_attacks(them, ksq), to)) update_checkers<PAWN>(&checkersBB, ksq, from, to, dcCandidates);
set_bit(&checkersBB, to);
if (bit_is_set(dcCandidates, from))
checkersBB |= ( (piece_attacks<ROOK>(ksq) & rooks_and_queens(us))
|(piece_attacks<BISHOP>(ksq) & bishops_and_queens(us)));
break; break;
case KNIGHT: case KNIGHT:

5
src/position.h
View file

@ -532,6 +532,11 @@ inline Bitboard Position::pawn_attacks(Color c, Square s) const {
return StepAttackBB[pawn_of_color(c)][s]; return StepAttackBB[pawn_of_color(c)][s];
} }
template<>
inline Bitboard Position::piece_attacks<PAWN>(Square s) const {
return StepAttackBB[pawn_of_color(opposite_color(sideToMove))][s];
}
template<> template<>
inline Bitboard Position::piece_attacks<KNIGHT>(Square s) const { inline Bitboard Position::piece_attacks<KNIGHT>(Square s) const {
return StepAttackBB[KNIGHT][s]; return StepAttackBB[KNIGHT][s];