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Micro-optmize castling moves

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Pre compute castle path so to quickly test
for impeded rule.

This speeds up perft on starting position
of more than 2%.

No functional change

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-02-27 12:11:18 +01:00
parent 5bb766e826
commit 34178205fc
3 changed files with 29 additions and 19 deletions
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8
src/position.h
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@@ -127,6 +127,7 @@ public:
// Castling rights
bool can_castle(CastleRight f) const;
bool can_castle(Color c) const;
bool castle_impeded(CastleRight f) const;
Square castle_rook_square(CastleRight f) const;
// Bitboards for pinned pieces and discovered check candidates
@@ -207,7 +208,7 @@ private:
// Initialization helper functions (used while setting up a position)
void clear();
void put_piece(Piece p, Square s);
void set_castle_right(Color c, Square rsq);
void set_castle_right(Color c, Square rfrom);
bool move_is_legal(const Move m) const;
// Helper template functions
@@ -242,6 +243,7 @@ private:
// Other info
int castleRightsMask[64]; // [square]
Square castleRookSquare[16]; // [castleRight]
Bitboard castlePath[16]; // [castleRight]
StateInfo startState;
int64_t nodes;
int startPosPly;
@@ -331,6 +333,10 @@ inline bool Position::can_castle(Color c) const {
return st->castleRights & ((WHITE_OO | WHITE_OOO) << c);
}
inline bool Position::castle_impeded(CastleRight f) const {
return occupied & castlePath[f];
}
inline Square Position::castle_rook_square(CastleRight f) const {
return castleRookSquare[f];
}