stellar

Bishop and Rook attack on the fly

1 files changed, 69 insertions(+), 2 deletions(-)

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

@@ -169,7 +169,7 @@ U64 mask_king_attacks(int square) { return attacks; }

U64 mask_bishup_attacks(int square) {

U64 mask_bishop_attacks(int square) {

U64 bitboard = C64(0), attacks = C64(0), tmp; int tr = square / 8, tf = square % 8, i;

@@ -205,6 +205,66 @@ U64 mask_rook_attacks(int square) { return attacks; }

U64 bishop_attacks_on_the_fly(int square, U64 block) {

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 < MIN(7 - tf, 7 - tr); i++) {

attacks |= tmp = noEaOne(tmp);

if (tmp & block)

break;

}

for (i = 0, tmp = bitboard; i < MIN(tf, 7 - tr); i++) {

attacks |= tmp = noWeOne(tmp);

if (tmp & block)

break;

}

for (i = 0, tmp = bitboard; i < MIN(7 - tf, tr); i++) {

attacks |= tmp = soEaOne(tmp);

if (tmp & block)

break;

}

for (i = 0, tmp = bitboard; i < MIN(tf, tr); i++) {

attacks |= tmp = soWeOne(tmp);

if (tmp & block)

break;

}

return attacks;

}

U64 rook_attacks_on_the_fly(int square, U64 block) {

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; i++) {

attacks |= tmp = westOne(tmp);

if (tmp & block)

break;

}

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

attacks |= tmp = soutOne(tmp);

if (tmp & block)

break;

}

for (i = 0, tmp = bitboard; i < 7; i++) {

attacks |= tmp = eastOne(tmp);

if (tmp & block)

break;

}

for (i = 0, tmp = bitboard; i < 7; i++) {

attacks |= tmp = nortOne(tmp);

if (tmp & block)

break;

}

return attacks;

}

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

@@ -216,7 +276,14 @@ void init_leapers_attacks(void) { int main(void) { init_leapers_attacks();

U64 block = C64(0);

bit_set(block, e4);

bit_set(block, e5);

bit_set(block, d4);

bit_set(block, d5);

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

bitboard_print(mask_rook_attacks(square));

bitboard_print(rook_attacks_on_the_fly(square, block));

return 0; }