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Prefer 0 to EmptyBoardBB

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Easier and even faster or at least easier to optimize.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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Marco Costalba
2011-12-03 11:56:11 +01:00
parent 5c5af4fa65
commit a44c5cf4f7
9 changed files with 41 additions and 43 deletions
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2
src/pawns.cpp
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@@ -182,7 +182,7 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
// pawn on neighboring files is higher or equal than the number of
// enemy pawns in the forward direction on the neighboring files.
candidate = !(opposed | passed | backward | isolated)
&& (b = attack_span_mask(Them, s + pawn_push(Us)) & ourPawns) != EmptyBoardBB
&& (b = attack_span_mask(Them, s + pawn_push(Us)) & ourPawns) != 0
&& count_1s<Max15>(b) >= count_1s<Max15>(attack_span_mask(Us, s) & theirPawns);
// Passed pawns will be properly scored in evaluation because we need