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Small speed-up in BetweenBB

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A speed-up removing some comparisons.

closes https://github.com/official-stockfish/Stockfish/pull/2571

No functional change.
This commit is contained in:
protonspring 2020-03-03 16:35:45 -07:00 • committed by Joost VandeVondele
parent 5a7b45eac9
commit 0424273d0b
1 changed files with 2 additions and 2 deletions
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4
src/bitboard.h
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@ -199,8 +199,8 @@ inline Bitboard adjacent_files_bb(Square s) {
/// If the given squares are not on a same file/rank/diagonal, return 0.
inline Bitboard between_bb(Square s1, Square s2) {
return LineBB[s1][s2] & ( (AllSquares << (s1 + (s1 < s2)))
^(AllSquares << (s2 + !(s1 < s2))));
Bitboard b = LineBB[s1][s2] & ((AllSquares << s1) ^ (AllSquares << s2));
return b & (b - 1); //exclude lsb
}