HCha/Stockfish
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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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25
src/position.cpp
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@@ -242,14 +242,27 @@ void Position::from_fen(const string& fenStr, bool isChess960) {
/// Position::set_castle_right() is an helper function used to set castling
/// rights given the corresponding color and the rook starting square.
void Position::set_castle_right(Color c, Square rsq) {
void Position::set_castle_right(Color c, Square rfrom) {
int f = (rsq < king_square(c) ? WHITE_OOO : WHITE_OO) << c;
Square kfrom = king_square(c);
bool kingSide = kfrom < rfrom;
int cr = (kingSide ? WHITE_OO : WHITE_OOO) << c;
st->castleRights |= f;
castleRightsMask[king_square(c)] |= f;
castleRightsMask[rsq] |= f;
castleRookSquare[f] = rsq;
st->castleRights |= cr;
castleRightsMask[kfrom] |= cr;
castleRightsMask[rfrom] |= cr;
castleRookSquare[cr] = rfrom;
Square kto = relative_square(c, kingSide ? SQ_G1 : SQ_C1);
Square rto = relative_square(c, kingSide ? SQ_F1 : SQ_D1);
for (Square s = std::min(rfrom, rto); s <= std::max(rfrom, rto); s++)
if (s != kfrom && s != rfrom)
castlePath[cr] |= s;
for (Square s = std::min(kfrom, kto); s <= std::max(kfrom, kto); s++)
if (s != kfrom && s != rfrom)
castlePath[cr] |= s;
}