q_set_targets_subrange_
q_set_targets_subrange_(q, q->nr_elts, 0, q->nr_levels);
q_set_targets_subrange_(q, q->nr_in_top_levels,
q_set_targets_subrange_(q, q->nr_elts - q->nr_in_top_levels,
q_set_targets_subrange_(q, 0, 0, q->nr_levels - q->nr_top_levels);