stellar

get_random_U32_number() function

1 files changed, 20 insertions(+), 9 deletions(-)

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

@@ -15,6 +15,9 @@ typedef unsigned long long U64; // define bitboard data type #define C64(constantU64) constantU64##ULL // define shorthand for constants

typedef unsigned int U32;

#define C32(constantU32) constantU32##U

// useful bit patterns const U64 universe = C64(0xffffffffffffffff); // const U64 notAFile = C64(0xfefefefefefefefe); // ~0x0101010101010101

@@ -282,16 +285,24 @@ U64 set_occupancy(int index, int bits_in_mask, U64 attack_mask) { return occupancy; }

// pseudo random number state

U32 state = C32(1804289383);

U32 get_random_U32_number() {

U32 number = state;

number ^= number << 13;

number ^= number >> 17;

number ^= number << 5;

return state = number;

}

int main(void) { init_leapers_attacks();

for (int rank = 0; rank < 8; rank++) {

for (int file = 0; file < 8; file++) {

int square = rank * 8 + file;

/* printf("%d, ", bit_count(mask_bishop_attacks(square))); */

printf("%d, ", bit_count(mask_rook_attacks(square)));

}

printf("\n");

}

printf("%u\n", get_random_U32_number());

printf("%u\n", get_random_U32_number());

printf("%u\n", get_random_U32_number());

printf("%u\n", get_random_U32_number());

printf("%u\n", get_random_U32_number());

return 0; }