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First check threshold in space evaluation 

Currently, we first calculate some bitboards at the top of Evaluation::space()
and then check whether we actually need them. Invert the ordering. Of course this
does not make a difference in current master because the constexpr bitboard
calculations are in fact done at compile time by any decent compiler, but I find
my version a bit healthier since it will always meet or exceed current implementation
even if we eventually change the spaceMask to something not contsexpr.

No functional change.
pull/1726/head^2
Stefano Cardanobile 2018-08-08 14:27:28 +02:00 committed by Stéphane Nicolet
parent c569cf263d
commit bd4d2b0576
1 changed files with 3 additions and 3 deletions
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6
src/evaluate.cpp
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@ -718,14 +718,14 @@ namespace {
template<Tracing T> template<Color Us>
Score Evaluation<T>::space() const {
if (pos.non_pawn_material() < SpaceThreshold)
return SCORE_ZERO;
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Bitboard SpaceMask =
Us == WHITE ? CenterFiles & (Rank2BB | Rank3BB | Rank4BB)
: CenterFiles & (Rank7BB | Rank6BB | Rank5BB);
if (pos.non_pawn_material() < SpaceThreshold)
return SCORE_ZERO;
// Find the available squares for our pieces inside the area defined by SpaceMask
Bitboard safe = SpaceMask
& ~pos.pieces(Us, PAWN)