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Faster handling of king captures in Position::see

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Another SEE speed up that passed the SPRT short TC test!

LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 81337 W: 15060 L: 14745 D: 51532

No functional change.
This commit is contained in:
Henri Wiechers 2014-02-08 07:46:46 +02:00 • committed by Marco Costalba
parent 41641e3b1e
commit ddeb01612b
1 changed files with 9 additions and 4 deletions
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13
src/position.cpp
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@ -1080,13 +1080,18 @@ int Position::see(Move m) const {
// Locate and remove the next least valuable attacker
captured = min_attacker<PAWN>(byTypeBB, to, stmAttackers, occupied, attackers);
stm = ~stm;
stmAttackers = attackers & pieces(stm);
// Stop before processing a king capture
if (captured == KING && stmAttackers)
break;
if (captured == KING)
{
if (stmAttackers == attackers)
++slIndex;
break;
}
stm = ~stm;
stmAttackers = attackers & pieces(stm);
++slIndex;
} while (stmAttackers);