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Code Issues Releases Wiki Activity

Clean-up some shifting in space calculation (#1955)

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No functional change.
This commit is contained in:
protonspring 2019-01-20 04:21:16 -07:00 • committed by Marco Costalba
parent 3acacf8471
commit 691a287bfe
1 changed files with 4 additions and 3 deletions
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7
src/evaluate.cpp
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@ -701,7 +701,8 @@ namespace {
if (pos.non_pawn_material() < SpaceThreshold)
return SCORE_ZERO;
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Direction Down = (Us == WHITE ? SOUTH : NORTH);
constexpr Bitboard SpaceMask =
Us == WHITE ? CenterFiles & (Rank2BB | Rank3BB | Rank4BB)
: CenterFiles & (Rank7BB | Rank6BB | Rank5BB);
@ -713,8 +714,8 @@ namespace {
// Find all squares which are at most three squares behind some friendly pawn
Bitboard behind = pos.pieces(Us, PAWN);
behind |= (Us == WHITE ? behind >> 8 : behind << 8);
behind |= (Us == WHITE ? behind >> 16 : behind << 16);
behind |= shift<Down>(behind);
behind |= shift<Down>(shift<Down>(behind));
int bonus = popcount(safe) + popcount(behind & safe);
int weight = pos.count<ALL_PIECES>(Us)