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Speed up updateShelter()

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-08-26 12:13:07 +02:00
parent 1b4084b4a5
commit 2a2353aac6
4 changed files with 37 additions and 33 deletions
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24
src/pawns.cpp
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@@ -320,27 +320,3 @@ int PawnInfoTable::evaluate_pawn_storm(Square s, Rank r, File f, Bitboard theirP
}
return bonus;
}
/// PawnInfo::updateShelter calculates and caches king shelter. It is called
/// only when king square changes, about 20% of total king_shelter() calls.
Score PawnInfo::updateShelter(const Position& pos, Color c, Square ksq) {
Bitboard pawns;
unsigned r, k, shelter = 0;
if (relative_rank(c, ksq) <= RANK_4)
{
pawns = pos.pieces(PAWN, c) & this_and_neighboring_files_bb(ksq);
r = ksq & (7 << 3);
k = (c ? -8 : 8);
for (int i = 1; i < 4; i++)
{
r += k;
shelter += BitCount8Bit[(pawns >> r) & 0xFF] * (128 >> i);
}
}
kingSquares[c] = ksq;
kingShelters[c] = make_score(shelter, 0);
return kingShelters[c];
}