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position: use XOR in square clr/set, for castling flags to 8 bits

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Bruno Raoult
2024-09-11 08:14:55 +02:00
parent 9dd7c7064d
commit 8bf4262e11
5 changed files with 39 additions and 23 deletions
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34
src/position.h
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@@ -88,8 +88,8 @@ static __always_inline void pos_set_sq(pos_t *pos, square_t square, piece_t piec
bug_on(pos->board[square] != EMPTY);
pos->board[square] = piece;
pos->bb[color][type] |= BIT(square);
pos->bb[color][ALL_PIECES] |= BIT(square);
pos->bb[color][type] ^= BIT(square);
pos->bb[color][ALL_PIECES] ^= BIT(square);
//if (type == KING)
// pos->king[color] = square;
@@ -114,12 +114,38 @@ static __always_inline void pos_clr_sq(pos_t *pos, square_t square)
//pos->key ^= zobrist_pieces[piece][square];
pos->board[square] = EMPTY;
pos->bb[color][type] &= ~BIT(square);
pos->bb[color][ALL_PIECES] &= ~BIT(square);
pos->bb[color][type] ^= BIT(square);
pos->bb[color][ALL_PIECES] ^= BIT(square);
//if (type == KING)
// pos->king[color] = SQUARE_NONE;
}
/**
* pos_mv_sq - move a piece from a square to another one.
* @pos: position
* @from: source square
* @to: dest square
*
* Both position board and bitboards are modified.
* This function is equivalent to:
* pos_set_sq(pos, to, pos->board[from]);
* pos_clr_sq(pos, from);
*/
static __always_inline void pos_mv_sq(pos_t *pos, square_t from, square_t to)
{
piece_t pc = pos->board[from];
piece_type_t pt = PIECE(pc);
color_t color = COLOR(pc);
bitboard_t bb_squares = BIT(from) | BIT(to);
bug_on(pc == EMPTY || pos->board[to] != EMPTY);
pos->board[from] = EMPTY;
pos->board[to] = pc;
pos->bb[color][pt] ^= bb_squares;
pos->bb[color][ALL_PIECES] ^= bb_squares;
}
/**
* pos_occ() - get position occupation (all pieces)
* @pos: position