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Use 16 bits to store a move instead of 17

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Shrink of 1 bit so to fit a move in an uint_16 and
possibly a MoveStack in an uint_32.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-01-07 11:50:38 +01:00
parent dcbc8a7e75
commit a46b53e1c2
2 changed files with 22 additions and 23 deletions
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src/move.h
+18 -19
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@@ -40,13 +40,12 @@ const int MOVES_MAX = 256;
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
@@ -153,24 +152,20 @@ inline Square move_to(Move m) {
return Square(m & 0x3F);
}
inline PieceType move_promotion_piece(Move m) {
return PieceType((int(m) >> 12) & 7);
inline bool move_is_special(Move m) {
return m & (3 << 14);
}
inline int move_is_special(Move m) {
return m & (0x1F << 12);
}
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) {
@@ -181,20 +176,24 @@ inline bool move_is_long_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));
}