No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
+/// A move needs 17 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
+///
+/// Special cases are MOVE_NONE and MOVE_NULL. We can sneak these in
+/// because in any normal move destination square is always different
+/// from origin square while MOVE_NONE and MOVE_NULL have the same
+/// origin and destination square, 0 and 1 respectively.
+
enum Move {
MOVE_NONE = 0,
enum Move {
MOVE_NONE = 0,
- MOVE_NULL = 65,
- MOVE_MAX = 0xFFFFFF
////
inline Square move_from(Move m) {
////
inline Square move_from(Move m) {
- return Square((int(m) >> 6) & 077);
+ return Square((int(m) >> 6) & 0x3F);
}
inline Square move_to(Move m) {
}
inline Square move_to(Move m) {
- return Square(m & 077);
+ return Square(m & 0x3F);
}
inline PieceType move_promotion(Move m) {
}
inline PieceType move_promotion(Move m) {
-/// The TTEntry class is the class of transposition table entries.
+/// The TTEntry class is the class of transposition table entries
+///
+/// A TTEntry needs 128 bits to be stored
+///
+/// bit 0-63: key
+/// bit 64-95: data
+/// bit 96-111: value
+/// bit 112-127: depth
+///
+/// the 32 bits of the data field are so defined
+///
+/// bit 0-16: move
+/// bit 17-19: not used
+/// bit 20-22: value type
+/// bit 23-31: generation