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Small update_checkers() cleanup

Browse source 
And is a bit faster too.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-11-10 10:05:09 +01:00
parent 8a116ce691
commit f7f09b91ea
1 changed files with 9 additions and 11 deletions
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20
src/position.cpp
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@ -658,20 +658,18 @@ inline void Position::update_checkers(Bitboard* pCheckersBB, Square ksq, Square
const bool Rook = (Piece == QUEEN || Piece == ROOK); const bool Rook = (Piece == QUEEN || Piece == ROOK);
const bool Slider = Bishop || Rook; const bool Slider = Bishop || Rook;
assert(*pCheckersBB == EmptyBoardBB);
// Direct checks // Direct checks
if ( ( (Bishop && bit_is_set(BishopPseudoAttacks[ksq], to)) if ( ( !Slider // try to early skip slide piece attacks
|| (Bishop && bit_is_set(BishopPseudoAttacks[ksq], to))
|| (Rook && bit_is_set(RookPseudoAttacks[ksq], to))) || (Rook && bit_is_set(RookPseudoAttacks[ksq], to)))
&& bit_is_set(attacks_from<Piece>(ksq), to)) // slow, try to early skip && bit_is_set(Piece == PAWN ? attacks_from<PAWN>(ksq, opposite_color(sideToMove)) : attacks_from<Piece>(ksq) , to))
set_bit(pCheckersBB, to); {
*pCheckersBB = SetMaskBB[to];
else if ( Piece != KING }
&& !Slider
&& bit_is_set(Piece == PAWN ? attacks_from<PAWN>(ksq, opposite_color(sideToMove))
: attacks_from<Piece>(ksq), to))
set_bit(pCheckersBB, to);
// Discovery checks // Discovery checks
if (Piece != QUEEN && bit_is_set(dcCandidates, from)) if (Piece != QUEEN && dcCandidates && bit_is_set(dcCandidates, from))
{ {
if (Piece != ROOK) if (Piece != ROOK)
(*pCheckersBB) |= (attacks_from<ROOK>(ksq) & pieces(ROOK, QUEEN, side_to_move())); (*pCheckersBB) |= (attacks_from<ROOK>(ksq) & pieces(ROOK, QUEEN, side_to_move()));