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Microoptimize generate<MV_EVASION>

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-06-02 12:14:44 +01:00
parent fca0a2dd88
commit 5ff6289afd
1 changed files with 9 additions and 4 deletions
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13
src/movegen.cpp
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@ -272,12 +272,17 @@ MoveStack* generate<MV_EVASION>(const Position& pos, MoveStack* mlist) {
case BISHOP: sliderAttacks |= BishopPseudoAttacks[checksq]; break;
case ROOK: sliderAttacks |= RookPseudoAttacks[checksq]; break;
case QUEEN:
// In case of a queen remove also squares attacked in the other direction to
// avoid possible illegal moves when queen and king are on adjacent squares.
if (RookPseudoAttacks[checksq] & (1ULL << ksq))
sliderAttacks |= RookPseudoAttacks[checksq] | pos.attacks_from<BISHOP>(checksq);
// If queen and king are far we can safely remove all the squares attacked
// in the other direction becuase are not reachable by the king anyway.
if (squares_between(ksq, checksq) || (RookPseudoAttacks[checksq] & (1ULL << ksq)))
sliderAttacks |= QueenPseudoAttacks[checksq];
// Otherwise, if king and queen are adjacent and on a diagonal line, we need to
// use real rook attacks to check if king is safe to move in the other direction.
// For example: king in B2, queen in A1 a knight in B1, and we can safely move to C1.
else
sliderAttacks |= BishopPseudoAttacks[checksq] | pos.attacks_from<ROOK>(checksq);
default:
break;
}