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Unify black and white code in generate_move_if_legal()

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-10-17 15:38:00 +02:00
parent 158911425b
commit 8be2c483a1
1 changed files with 78 additions and 106 deletions
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174
src/movegen.cpp
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@ -712,127 +712,99 @@ Move generate_move_if_legal(const Position &pos, Move m, Bitboard pinned) {
return MOVE_NONE;
// Proceed according to the type of the moving piece.
switch(type_of_piece(pc)) {
switch (type_of_piece(pc))
{
case PAWN:
// Pawn moves, as usual, are somewhat messy.
if (us == WHITE)
// If the destination square is on the 8/1th rank, the move must
// be a promotion.
if ( ( (square_rank(to) == RANK_8 && us == WHITE)
||(square_rank(to) == RANK_1 && us != WHITE))
&& !move_promotion(m))
return MOVE_NONE;
// Proceed according to the square delta between the source and
// destionation squares.
switch (to - from)
{
// If the destination square is on the 8th rank, the move must
// be a promotion.
if (square_rank(to) == RANK_8 && !move_promotion(m))
case DELTA_NW:
case DELTA_NE:
case DELTA_SW:
case DELTA_SE:
// Capture. The destination square must be occupied by an enemy
// piece (en passant captures was handled earlier).
if (pos.color_of_piece_on(to) != them)
return MOVE_NONE;
break;
// Proceed according to the square delta between the source and
// destionation squares.
switch (to - from)
{
case DELTA_NW:
case DELTA_NE:
// Capture. The destination square must be occupied by an enemy
// piece (en passant captures was handled earlier).
if (pos.color_of_piece_on(to) != them)
return MOVE_NONE;
break;
case DELTA_N:
case DELTA_S:
// Pawn push. The destination square must be empty.
if (!pos.square_is_empty(to))
return MOVE_NONE;
break;
case DELTA_N:
// Pawn push. The destination square must be empty.
if (!pos.square_is_empty(to))
return MOVE_NONE;
break;
case DELTA_NN:
// Double white pawn push. The destination square must be on the fourth
// rank, and both the destination square and the square between the
// source and destination squares must be empty.
if ( square_rank(to) != RANK_4
|| !pos.square_is_empty(to)
|| !pos.square_is_empty(from + DELTA_N))
return MOVE_NONE;
break;
case DELTA_NN:
// Double pawn push. The destination square must be on the fourth
// rank, and both the destination square and the square between the
// source and destination squares must be empty.
if ( square_rank(to) != RANK_4
case DELTA_SS:
// Double black pawn push. The destination square must be on the fifth
// rank, and both the destination square and the square between the
// source and destination squares must be empty.
if ( square_rank(to) != RANK_5
|| !pos.square_is_empty(to)
|| !pos.square_is_empty(from + DELTA_N))
|| !pos.square_is_empty(from + DELTA_S))
return MOVE_NONE;
break;
break;
default:
return MOVE_NONE;
}
}
else // (us == BLACK)
{
// If the destination square is on the 1th rank, the move must
// be a promotion.
if (square_rank(to) == RANK_1 && !move_promotion(m))
return MOVE_NONE;
// Proceed according to the square delta between the source and
// destionation squares.
switch (to - from)
{
case DELTA_SW:
case DELTA_SE:
// Capture. The destination square must be occupied by an enemy
// piece (en passant captures was handled earlier).
if (pos.color_of_piece_on(to) != them)
return MOVE_NONE;
break;
case DELTA_S:
// Pawn push. The destination square must be empty.
if (!pos.square_is_empty(to))
return MOVE_NONE;
break;
case DELTA_SS:
// Double pawn push. The destination square must be on the fifth
// rank, and both the destination square and the square between the
// source and destination squares must be empty.
if ( square_rank(to) != RANK_5
|| !pos.square_is_empty(to)
|| !pos.square_is_empty(from + DELTA_S))
return MOVE_NONE;
break;
default:
return MOVE_NONE;
}
default:
return MOVE_NONE;
}
// The move is pseudo-legal. Return it if it is legal.
return (pos.move_is_legal(m) ? m : MOVE_NONE);
break;
case KNIGHT:
return ( pos.knight_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case KNIGHT:
return ( pos.knight_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case BISHOP:
return ( pos.bishop_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case BISHOP:
return ( pos.bishop_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case ROOK:
return ( pos.rook_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case ROOK:
return ( pos.rook_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case QUEEN:
return ( pos.queen_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case QUEEN:
return ( pos.queen_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case KING:
return ( pos.king_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
case KING:
return ( pos.king_attacks_square(from, to)
&& pos.move_is_legal(m)
&& !move_promotion(m) ? m : MOVE_NONE);
break;
default:
assert(false);
default:
assert(false);
}
assert(false);
return MOVE_NONE;
assert(false);
return MOVE_NONE;
}