__common_powers_of_two
const int64_t gcd = __common_powers_of_two(factor, divisor);
const int64_t gcd = __common_powers_of_two(factor, divisor);
const uint64_t gcd = __common_powers_of_two(factor, divisor);
const uint64_t gcd = __common_powers_of_two(factor, divisor);