dt_stddev
uint64_t lsd = dt_stddev((uint64_t *)lhs, 1);
uint64_t rsd = dt_stddev((uint64_t *)rhs, 1);
val = dt_stddev((uint64_t *)addr, 1);
(unsigned long long) dt_stddev(data, normal) : 0));
extern uint64_t dt_stddev(uint64_t *, uint64_t);
dt_stddev((uint64_t *)data, normal)));