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Reformat and rename hash_after_move()

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Align to standard coding style and properly use
enum types. Rename while there.

No functional change.
This commit is contained in:
Marco Costalba
2014-10-04 06:07:55 +02:00
committed by Joona Kiiski
parent 4b926f227d
commit 74829342ef
3 changed files with 23 additions and 18 deletions
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31
src/position.cpp
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@@ -1015,22 +1015,27 @@ void Position::undo_null_move() {
sideToMove = ~sideToMove;
}
// Position::hash_after_move() updates the hash key needed for the speculative prefetch.
// It doesn't recognize special moves like castling, en-passant and promotions.
Key Position::hash_after_move(Move m) const {
int from = from_sq(m);
int to = to_sq(m);
Piece p = board[from];
Piece capP = board[to];
Key ret = st->key ^ Zobrist::side;
if (capP != NO_PIECE)
ret ^= Zobrist::psq[color_of(capP)][type_of(capP)][to];
ret ^= Zobrist::psq[color_of(p)][type_of(p)][to];
ret ^= Zobrist::psq[color_of(p)][type_of(p)][from];
return ret;
/// Position::key_after() computes the new hash key after the given moven. Needed
/// for speculative prefetch. It doesn't recognize special moves like castling,
/// en-passant and promotions.
Key Position::key_after(Move m) const {
Color us = sideToMove;
Square from = from_sq(m);
Square to = to_sq(m);
PieceType pt = type_of(piece_on(from));
PieceType captured = type_of(piece_on(to));
Key k = st->key ^ Zobrist::side;
if (captured)
k ^= Zobrist::psq[~us][captured][to];
return k ^ Zobrist::psq[us][pt][to] ^ Zobrist::psq[us][pt][from];
}
/// Position::see() is a static exchange evaluator: It tries to estimate the
/// material gain or loss resulting from a move.