#include "bitcount.h"
#include "rkiss.h"
-CACHE_LINE_ALIGNMENT
-
Bitboard RMasks[SQUARE_NB];
Bitboard RMagics[SQUARE_NB];
Bitboard* RAttacks[SQUARE_NB];
const uint64_t DeBruijn_64 = 0x3F79D71B4CB0A89ULL;
const uint32_t DeBruijn_32 = 0x783A9B23;
- CACHE_LINE_ALIGNMENT
-
int MS1BTable[256];
Square BSFTable[SQUARE_NB];
Bitboard RTable[0x19000]; // Storage space for rook attacks
std::string s = "+---+---+---+---+---+---+---+---+\n";
- for (Rank rank = RANK_8; rank >= RANK_1; --rank)
+ for (Rank r = RANK_8; r >= RANK_1; --r)
{
- for (File file = FILE_A; file <= FILE_H; ++file)
- s.append(b & (file | rank) ? "| X " : "| ");
+ for (File f = FILE_A; f <= FILE_H; ++f)
+ s.append(b & make_square(f, r) ? "| X " : "| ");
s.append("|\n+---+---+---+---+---+---+---+---+\n");
}
void Bitboards::init() {
for (Square s = SQ_A1; s <= SQ_H8; ++s)
- BSFTable[bsf_index(SquareBB[s] = 1ULL << s)] = s;
+ {
+ SquareBB[s] = 1ULL << s;
+ BSFTable[bsf_index(SquareBB[s])] = s;
+ }
for (Bitboard b = 1; b < 256; ++b)
MS1BTable[b] = more_than_one(b) ? MS1BTable[b - 1] : lsb(b);
for (Square s2 = SQ_A1; s2 <= SQ_H8; ++s2)
if (s1 != s2)
{
- SquareDistance[s1][s2] = std::max(file_distance(s1, s2), rank_distance(s1, s2));
+ SquareDistance[s1][s2] = std::max(distance<File>(s1, s2), distance<Rank>(s1, s2));
DistanceRingsBB[s1][SquareDistance[s1][s2] - 1] |= s2;
}
{
Square to = s + Square(c == WHITE ? steps[pt][i] : -steps[pt][i]);
- if (is_ok(to) && square_distance(s, to) < 3)
+ if (is_ok(to) && distance(s, to) < 3)
StepAttacksBB[make_piece(c, pt)][s] |= to;
}
for (int i = 0; i < 4; ++i)
for (Square s = sq + deltas[i];
- is_ok(s) && square_distance(s, s - deltas[i]) == 1;
+ is_ok(s) && distance(s, s - deltas[i]) == 1;
s += deltas[i])
{
attack |= s;
void init_magics(Bitboard table[], Bitboard* attacks[], Bitboard magics[],
Bitboard masks[], unsigned shifts[], Square deltas[], Fn index) {
- int MagicBoosters[][8] = { { 969, 1976, 2850, 542, 2069, 2852, 1708, 164 },
- { 3101, 552, 3555, 926, 834, 26, 2131, 1117 } };
-
+ int MagicBoosters[][RANK_NB] = { { 969, 1976, 2850, 542, 2069, 2852, 1708, 164 },
+ { 3101, 552, 3555, 926, 834, 26, 2131, 1117 } };
RKISS rk;
Bitboard occupancy[4096], reference[4096], edges, b;
int i, size, booster;
b = size = 0;
do {
occupancy[size] = b;
- reference[size++] = sliding_attack(deltas, s, b);
+ reference[size] = sliding_attack(deltas, s, b);
+
+ if (HasPext)
+ attacks[s][_pext_u64(b, masks[s])] = reference[size];
+
+ size++;
b = (b - masks[s]) & masks[s];
} while (b);
if (s < SQ_H8)
attacks[s + 1] = attacks[s] + size;
+ if (HasPext)
+ continue;
+
booster = MagicBoosters[Is64Bit][rank_of(s)];
// Find a magic for square 's' picking up an (almost) random number
// until we find the one that passes the verification test.
do {
- do magics[s] = rk.magic_rand<Bitboard>(booster);
+ do
+ magics[s] = rk.magic_rand<Bitboard>(booster);
while (popcount<Max15>((magics[s] * masks[s]) >> 56) < 6);
std::memset(attacks[s], 0, size * sizeof(Bitboard));