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Avoid to call useless sliders attacks in update_checkers()

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Quickly filter out some calls to sliders attacks
when we already know that will fail for sure.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-03-04 14:50:39 +01:00
parent 68e711aac6
commit 7c84b39a42
1 changed files with 12 additions and 1 deletions
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13
src/position.cpp
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@ -648,7 +648,18 @@ template<PieceType Piece>
inline void Position::update_checkers(Bitboard* pCheckersBB, Square ksq, Square from,
Square to, Bitboard dcCandidates) {
if (Piece != KING && bit_is_set(piece_attacks<Piece>(ksq), to))
const bool Bishop = (Piece == QUEEN || Piece == BISHOP);
const bool Rook = (Piece == QUEEN || Piece == ROOK);
const bool Slider = Bishop || Rook;
if ( ( (Bishop && bit_is_set(BishopPseudoAttacks[ksq], to))
|| (Rook && bit_is_set(RookPseudoAttacks[ksq], to)))
&& bit_is_set(piece_attacks<Piece>(ksq), to)) // slow, try to early skip
set_bit(pCheckersBB, to);
else if ( Piece != KING
&& !Slider
&& bit_is_set(piece_attacks<Piece>(ksq), to))
set_bit(pCheckersBB, to);
if (Piece != QUEEN && bit_is_set(dcCandidates, from))