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Code Issues Releases Wiki Activity

Reformat and rename hash_after_move()

Browse source 
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
View file

@ -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.

2
src/position.h
View file

@ -139,7 +139,6 @@ public:
void undo_move(Move m);
void do_null_move(StateInfo& st);
void undo_null_move();
Key hash_after_move(Move m) const;
// Static exchange evaluation
Value see(Move m) const;
@ -147,6 +146,7 @@ public:
// Accessing hash keys
Key key() const;
Key key_after(Move m) const;
Key exclusion_key() const;
Key pawn_key() const;
Key material_key() const;

8
src/search.cpp
View file

@ -788,8 +788,8 @@ moves_loop: // When in check and at SpNode search starts from here
}
}
// Speculative prefetch
prefetch((char*)TT.first_entry(pos.hash_after_move(move)));
// Speculative prefetch as early as possible
prefetch((char*)TT.first_entry(pos.key_after(move)));
// Check for legality just before making the move
if (!RootNode && !SpNode && !pos.legal(move, ci.pinned))
@ -1140,8 +1140,8 @@ moves_loop: // When in check and at SpNode search starts from here
&& pos.see_sign(move) < VALUE_ZERO)
continue;
// Speculative prefetch
prefetch((char*)TT.first_entry(pos.hash_after_move(move)));
// Speculative prefetch as early as possible
prefetch((char*)TT.first_entry(pos.key_after(move)));
// Check for legality just before making the move
if (!pos.legal(move, ci.pinned))