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small cleanups

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closes https://github.com/official-stockfish/Stockfish/pull/2695

No functional change
This commit is contained in:
Joost VandeVondele
2020-06-21 15:21:46 +02:00
parent bc3c215490
commit 6f15e7fab2
14 changed files with 50 additions and 61 deletions
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25
src/bitboard.cpp
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@@ -40,7 +40,7 @@ namespace {
Bitboard RookTable[0x19000]; // To store rook attacks
Bitboard BishopTable[0x1480]; // To store bishop attacks
void init_magics(Bitboard table[], Magic magics[], Direction directions[]);
void init_magics(PieceType pt, Bitboard table[], Magic magics[]);
}
@@ -79,11 +79,8 @@ void Bitboards::init() {
for (Square s2 = SQ_A1; s2 <= SQ_H8; ++s2)
SquareDistance[s1][s2] = std::max(distance<File>(s1, s2), distance<Rank>(s1, s2));
Direction RookDirections[] = { NORTH, EAST, SOUTH, WEST };
Direction BishopDirections[] = { NORTH_EAST, SOUTH_EAST, SOUTH_WEST, NORTH_WEST };
init_magics(RookTable, RookMagics, RookDirections);
init_magics(BishopTable, BishopMagics, BishopDirections);
init_magics(ROOK, RookTable, RookMagics);
init_magics(BISHOP, BishopTable, BishopMagics);
for (Square s1 = SQ_A1; s1 <= SQ_H8; ++s1)
{
@@ -109,15 +106,17 @@ void Bitboards::init() {
namespace {
Bitboard sliding_attack(Direction directions[], Square sq, Bitboard occupied) {
Bitboard sliding_attack(PieceType pt, Square sq, Bitboard occupied) {
Bitboard attacks = 0;
Direction RookDirections[4] = {NORTH, SOUTH, EAST, WEST};
Direction BishopDirections[4] = {NORTH_EAST, SOUTH_EAST, SOUTH_WEST, NORTH_WEST};
for (int i = 0; i < 4; ++i)
for(Direction d : (pt == ROOK ? RookDirections : BishopDirections))
{
Square s = sq;
while(safe_destination(s, directions[i]) && !(occupied & s))
attacks |= (s += directions[i]);
while(safe_destination(s, d) && !(occupied & s))
attacks |= (s += d);
}
return attacks;
@@ -129,7 +128,7 @@ namespace {
// www.chessprogramming.org/Magic_Bitboards. In particular, here we use the so
// called "fancy" approach.
void init_magics(Bitboard table[], Magic magics[], Direction directions[]) {
void init_magics(PieceType pt, Bitboard table[], Magic magics[]) {
// Optimal PRNG seeds to pick the correct magics in the shortest time
int seeds[][RANK_NB] = { { 8977, 44560, 54343, 38998, 5731, 95205, 104912, 17020 },
@@ -149,7 +148,7 @@ namespace {
// the number of 1s of the mask. Hence we deduce the size of the shift to
// apply to the 64 or 32 bits word to get the index.
Magic& m = magics[s];
m.mask = sliding_attack(directions, s, 0) & ~edges;
m.mask = sliding_attack(pt, s, 0) & ~edges;
m.shift = (Is64Bit ? 64 : 32) - popcount(m.mask);
// Set the offset for the attacks table of the square. We have individual
@@ -161,7 +160,7 @@ namespace {
b = size = 0;
do {
occupancy[size] = b;
reference[size] = sliding_attack(directions, s, b);
reference[size] = sliding_attack(pt, s, b);
if (HasPext)
m.attacks[pext(b, m.mask)] = reference[size];