stellar

Rook attack mask

1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/ src/engine.c b/ src/engine.c

@@ -187,6 +187,24 @@ U64 mask_bishup_attacks(int square) { return attacks; }

U64 mask_rook_attacks(int square) {

U64 bitboard = C64(0), attacks = C64(0), tmp;

int tr = square / 8, tf = square % 8, i;

bit_set(bitboard, square);

for (i = 0, tmp = bitboard; i < tf - 1; i++)

attacks |= tmp = westOne(tmp);

for (i = 0, tmp = bitboard; i < tr - 1; i++)

attacks |= tmp = soutOne(tmp);

for (i = 0, tmp = bitboard; i < 6 - tf; i++)

attacks |= tmp = eastOne(tmp);

for (i = 0, tmp = bitboard; i < 6 - tr; i++)

attacks |= tmp = nortOne(tmp);

return attacks;

}

void init_leapers_attacks(void) { for (int square = 0; square < 64; square++) { pawn_attacks[WHITE][square] = mask_pawn_attacks(WHITE, square);

@@ -198,5 +216,7 @@ void init_leapers_attacks(void) { int main(void) { init_leapers_attacks();

for (int square = 0; square < 64; square++)

bitboard_print(mask_rook_attacks(square));

return 0; }