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Use checker info to remove a bunch of hidden checks updates

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Another powerful condition let us remove a big chunk of
useless updates.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-02-28 16:49:50 +01:00
parent 6a8cfe79da
commit 9b6b9e67fe
1 changed files with 18 additions and 2 deletions
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20
src/position.cpp
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@ -699,14 +699,30 @@ void Position::update_hidden_checks(Square from, Square to) {
set_bit(&moveSquares, to);
// Our moving piece could have been a possible pinner or hidden checker behind a dcCandidates?
bool checkerMoved = (st->dcCandidates[us] | st->pinners[them]) && (moveSquares & sliders());
bool checkerMoved = (st->dcCandidates[us] || bit_is_set(st->pinners[them], from)) && (moveSquares & sliders());
// If we are moving from/to an opponent king attack direction and we was a possible hidden checker
// or there exsist some possible hidden checker on that line then recalculate the position
// otherwise skip because our dcCandidates and opponent pinned pieces are not changed.
if ( (moveSquares & RookPseudoAttacks[ksq]) && (checkerMoved || (rooks_and_queens(us) & RookPseudoAttacks[ksq]))
|| (moveSquares & BishopPseudoAttacks[ksq]) && (checkerMoved || (bishops_and_queens(us) & BishopPseudoAttacks[ksq])))
find_hidden_checks(us, Pinned | DcCandidates);
{
// If the move gives direct check and we don't have pinners/dc cadidates
// then we can be sure that we won't have them also after the move if
// we are not moving from a possible king attack direction.
bool outsideChecker = false;
if ( bit_is_set(st->checkersBB, to)
&& !(bit_is_set(RookPseudoAttacks[ksq], from) && (checkerMoved || (rooks_and_queens(us) & RookPseudoAttacks[ksq])))
&& !(bit_is_set(BishopPseudoAttacks[ksq], from) && (checkerMoved || (bishops_and_queens(us) & BishopPseudoAttacks[ksq]))))
outsideChecker = true;
if (!outsideChecker || st->pinned[them])
find_hidden_checks(us, Pinned);
if (!outsideChecker || st->dcCandidates[us] || bit_is_set(st->pinned[them], to))
find_hidden_checks(us, DcCandidates);
}
ksq = king_square(us);