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.
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)