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Add lsb() overload

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Helper to find least significant bit relative to
the given color.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Gary Linscott
2013-08-28 09:35:04 +02:00
committed by Marco Costalba
parent e6482b7d97
commit aecdbfc4a0
3 changed files with 10 additions and 17 deletions
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4
src/pawns.cpp
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@@ -229,11 +229,11 @@ Value Entry::shelter_storm(const Position& pos, Square ksq) {
for (int f = kf - 1; f <= kf + 1; f++)
{
b = ourPawns & FileBB[f];
rkUs = b ? relative_rank(Us, Us == WHITE ? lsb(b) : msb(b)) : RANK_1;
rkUs = b ? relative_rank(Us, lsb(Us, b)) : RANK_1;
safety -= ShelterWeakness[rkUs];
b = theirPawns & FileBB[f];
rkThem = b ? relative_rank(Us, Us == WHITE ? lsb(b) : msb(b)) : RANK_1;
rkThem = b ? relative_rank(Us, lsb(Us, b)) : RANK_1;
safety -= StormDanger[rkUs == RANK_1 ? 0 : rkThem == rkUs + 1 ? 2 : 1][rkThem];
}