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Shrink castlePath[] and castleRookSquare[] sizes

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Shrinking from [16] to [2][2] is able to speedup
perft of start position of almost 5% !

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-04-08 11:32:01 +01:00
parent 0049d3f337
commit e56342ed00
4 changed files with 42 additions and 41 deletions
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11
src/movegen.cpp
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@@ -32,27 +32,22 @@
(*mlist++).move = make_move(to - (d), to); }
namespace {
enum CastlingSide { KING_SIDE, QUEEN_SIDE };
template<CastlingSide Side, bool OnlyChecks>
MoveStack* generate_castle(const Position& pos, MoveStack* mlist, Color us) {
const CastleRight CR[] = { Side ? WHITE_OOO : WHITE_OO,
Side ? BLACK_OOO : BLACK_OO };
CastleRight cr = CastleRight((Side == KING_SIDE ? WHITE_OO : WHITE_OOO) << us);
if (pos.castle_impeded(CR[us]) || !pos.can_castle(CR[us]))
if (pos.castle_impeded(us, Side) || !pos.can_castle(cr))
return mlist;
// After castling, the rook and king final positions are the same in Chess960
// as they would be in standard chess.
Square kfrom = pos.king_square(us);
Square rfrom = pos.castle_rook_square(CR[us]);
Square kto = relative_square(us, Side == KING_SIDE ? SQ_G1 : SQ_C1);
Square rfrom = pos.castle_rook_square(us, Side);
Bitboard enemies = pos.pieces(~us);
assert(!pos.in_check());
assert(pos.piece_on(kfrom) == make_piece(us, KING));
assert(pos.piece_on(rfrom) == make_piece(us, ROOK));
for (Square s = std::min(kfrom, kto), e = std::max(kfrom, kto); s <= e; s++)
if ( s != kfrom // We are not in check