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Move kingSquare[] array to StateInfo

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This avoids to reverting back when undoing the move.

No functional change. No performance change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-09-20 07:04:22 +01:00
parent 7c55b0e880
commit c5f44ef45b
2 changed files with 11 additions and 20 deletions
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26
src/position.cpp
View file

@ -704,7 +704,7 @@ void Position::do_move(Move m, StateInfo& newSt, Bitboard dcCandidates) {
struct ReducedStateInfo {
Key key, pawnKey, materialKey;
int castleRights, rule50;
Square epSquare;
Square kingSquare[2], epSquare;
Value mgValue, egValue;
Value npMaterial[2];
};
@ -786,7 +786,7 @@ void Position::do_move(Move m, StateInfo& newSt, Bitboard dcCandidates) {
// If the moving piece was a king, update the king square
if (pt == KING)
kingSquare[us] = to;
st->kingSquare[us] = to;
// Update piece lists, note that index[from] is not updated and
// becomes stale. This works as long as index[] is accessed just
@ -920,16 +920,15 @@ void Position::do_capture_move(Bitboard& key, PieceType capture, Color them, Squ
// Update hash key
key ^= zobrist[them][capture][capsq];
// If the captured piece was a pawn, update pawn hash key
if (capture == PAWN)
st->pawnKey ^= zobrist[them][PAWN][capsq];
// Update incremental scores
st->mgValue -= pst<MidGame>(them, capture, capsq);
st->egValue -= pst<EndGame>(them, capture, capsq);
// Update material
if (capture != PAWN)
// If the captured piece was a pawn, update pawn hash key,
// otherwise update non-pawn material.
if (capture == PAWN)
st->pawnKey ^= zobrist[them][PAWN][capsq];
else
st->npMaterial[them] -= piece_value_midgame(capture);
// Update material hash key
@ -1007,7 +1006,7 @@ void Position::do_castle_move(Move m) {
board[rto] = rook;
// Update king square
kingSquare[us] = kto;
st->kingSquare[us] = kto;
// Update piece lists
pieceList[us][KING][index[kfrom]] = kto;
@ -1120,10 +1119,6 @@ void Position::undo_move(Move m) {
board[from] = piece_of_color_and_type(us, pt);
board[to] = EMPTY;
// If the moving piece was a king, update the king square
if (pt == KING)
kingSquare[us] = from;
// Update piece list
index[from] = index[to];
pieceList[us][pt][index[from]] = from;
@ -1209,9 +1204,6 @@ void Position::undo_castle_move(Move m) {
board[rfrom] = piece_of_color_and_type(us, ROOK);
board[kfrom] = piece_of_color_and_type(us, KING);
// Update king square
kingSquare[us] = kfrom;
// Update piece lists
pieceList[us][KING][index[kto]] = kfrom;
pieceList[us][ROOK][index[rto]] = rfrom;
@ -1529,7 +1521,7 @@ void Position::put_piece(Piece p, Square s) {
pieceCount[c][pt]++;
if (pt == KING)
kingSquare[c] = s;
st->kingSquare[c] = s;
}

5
src/position.h
View file

@ -89,7 +89,7 @@ enum Phase {
struct StateInfo {
Key key, pawnKey, materialKey;
int castleRights, rule50;
Square epSquare;
Square kingSquare[2], epSquare;
Value mgValue, egValue;
Value npMaterial[2];
@ -326,7 +326,6 @@ private:
int index[64]; // [square]
// Other info
Square kingSquare[2];
Color sideToMove;
int gamePly;
Key history[MaxGameLength];
@ -423,7 +422,7 @@ inline Square Position::ep_square() const {
}
inline Square Position::king_square(Color c) const {
return kingSquare[c];
return st->kingSquare[c];
}
inline bool Position::can_castle_kingside(Color side) const {