cmp_u64
sort(a, COUNT, sizeof(*a), cmp_u64, NULL);
sort(dt, 5, sizeof(*dt), cmp_u64, NULL);
sort(x, 5, sizeof(*x), cmp_u64, NULL);
sort(dt_, 5, sizeof(*dt_), cmp_u64, NULL);
sort(x, 5, sizeof(*x), cmp_u64, NULL);
sort(x, 5, sizeof(*x), cmp_u64, NULL);
sort(x, 5, sizeof(*x), cmp_u64, NULL);