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Microptimize gives_check() for castling case

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Without patch we have 333198 nps, with patch 334249.

A very small +0.3%, not a lot manily becuase this is a
side path that is taken very few times.

Anyhow idea is correct becuase first 'quick' condition
has an hit rate of about 95%.

No functional change.
This commit is contained in:
Reuven Peleg 2013-07-19 17:01:07 +02:00 • committed by Marco Costalba
parent ee5514b8fd
commit 1a8f63a896
1 changed files with 2 additions and 2 deletions
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4
src/position.cpp
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@ -690,9 +690,9 @@ bool Position::move_gives_check(Move m, const CheckInfo& ci) const {
Square rfrom = to; // 'King captures the rook' notation
Square kto = relative_square(us, rfrom > kfrom ? SQ_G1 : SQ_C1);
Square rto = relative_square(us, rfrom > kfrom ? SQ_F1 : SQ_D1);
Bitboard b = (pieces() ^ kfrom ^ rfrom) | rto | kto;
return attacks_bb<ROOK>(rto, b) & ksq;
return (PseudoAttacks[ROOK][rto] & ksq)
&& (attacks_bb<ROOK>(rto, (pieces() ^ kfrom ^ rfrom) | rto | kto) & ksq);
}
default:
assert(false);