class Position;
-/// A move needs 17 bits to be stored
+/// A move needs 16 bits to be stored
///
/// bit 0- 5: destination square (from 0 to 63)
/// bit 6-11: origin square (from 0 to 63)
-/// bit 12-14: promotion piece type
-/// bit 15: en passant flag
-/// bit 16: castle flag
+/// bit 12-13: promotion piece type - 2 (from KNIGHT-2 to QUEEN-2)
+/// bit 14-15: special move flag: promotion (1), en passant (2), castle (3)
///
/// Special cases are MOVE_NONE and MOVE_NULL. We can sneak these in
/// because in any normal move destination square is always different
return Square(m & 0x3F);
}
-inline PieceType move_promotion_piece(Move m) {
- return PieceType((int(m) >> 12) & 7);
-}
-
-inline int move_is_special(Move m) {
- return m & (0x1F << 12);
+inline bool move_is_special(Move m) {
+ return m & (3 << 14);
}
-inline int move_is_promotion(Move m) {
- return m & (7 << 12);
+inline bool move_is_promotion(Move m) {
+ return (m & (3 << 14)) == (1 << 14);
}
inline int move_is_ep(Move m) {
- return m & (1 << 15);
+ return (m & (3 << 14)) == (2 << 14);
}
inline int move_is_castle(Move m) {
- return m & (1 << 16);
+ return (m & (3 << 14)) == (3 << 14);
}
inline bool move_is_short_castle(Move m) {
return move_is_castle(m) && (move_to(m) < move_from(m));
}
-inline Move make_promotion_move(Square from, Square to, PieceType promotion) {
- return Move(int(to) | (int(from) << 6) | (int(promotion) << 12));
+inline PieceType move_promotion_piece(Move m) {
+ return move_is_promotion(m) ? PieceType(((int(m) >> 12) & 3) + 2) : PIECE_TYPE_NONE;
}
inline Move make_move(Square from, Square to) {
return Move(int(to) | (int(from) << 6));
}
-inline Move make_castle_move(Square from, Square to) {
- return Move(int(to) | (int(from) << 6) | (1 << 16));
+inline Move make_promotion_move(Square from, Square to, PieceType promotion) {
+ return Move(int(to) | (int(from) << 6) | ((int(promotion) - 2) << 12) | (1 << 14));
}
inline Move make_ep_move(Square from, Square to) {
- return Move(int(to) | (int(from) << 6) | (1 << 15));
+ return Move(int(to) | (int(from) << 6) | (2 << 14));
+}
+
+inline Move make_castle_move(Square from, Square to) {
+ return Move(int(to) | (int(from) << 6) | (3 << 14));
}