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Small cleanups

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closes https://github.com/official-stockfish/Stockfish/pull/2606

No functional change
This commit is contained in:
Joost VandeVondele
2020-04-12 20:30:08 +02:00
parent 195a4fec6d
commit f83cb95740
11 changed files with 48 additions and 54 deletions
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29
src/bitboard.cpp
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@@ -84,23 +84,16 @@ void Bitboards::init() {
init_magics(RookTable, RookMagics, RookDirections);
init_magics(BishopTable, BishopMagics, BishopDirections);
// Helper returning the target bitboard of a step from a square
auto landing_square_bb = [&](Square s, int step)
{
Square to = Square(s + step);
return is_ok(to) && distance(s, to) <= 2 ? square_bb(to) : Bitboard(0);
};
for (Square s1 = SQ_A1; s1 <= SQ_H8; ++s1)
{
PawnAttacks[WHITE][s1] = pawn_attacks_bb<WHITE>(square_bb(s1));
PawnAttacks[BLACK][s1] = pawn_attacks_bb<BLACK>(square_bb(s1));
for (int step : {-9, -8, -7, -1, 1, 7, 8, 9} )
PseudoAttacks[KING][s1] |= landing_square_bb(s1, step);
PseudoAttacks[KING][s1] |= safe_destination(s1, step);
for (int step : {-17, -15, -10, -6, 6, 10, 15, 17} )
PseudoAttacks[KNIGHT][s1] |= landing_square_bb(s1, step);
PseudoAttacks[KNIGHT][s1] |= safe_destination(s1, step);
PseudoAttacks[QUEEN][s1] = PseudoAttacks[BISHOP][s1] = attacks_bb<BISHOP>(s1, 0);
PseudoAttacks[QUEEN][s1] |= PseudoAttacks[ ROOK][s1] = attacks_bb< ROOK>(s1, 0);
@@ -117,20 +110,16 @@ namespace {
Bitboard sliding_attack(Direction directions[], Square sq, Bitboard occupied) {
Bitboard attack = 0;
Bitboard attacks = 0;
for (int i = 0; i < 4; ++i)
for (Square s = sq + directions[i];
is_ok(s) && distance(s, s - directions[i]) == 1;
s += directions[i])
{
attack |= s;
{
Square s = sq;
while(safe_destination(s, directions[i]) && !(occupied & s))
attacks |= (s += directions[i]);
}
if (occupied & s)
break;
}
return attack;
return attacks;
}