ONE_FP
(unsigned long) ONE_FP/inv_w, maxlen, index);
agg->inv_w = ONE_FP/new_agg_weight;
q->iwsum = ONE_FP / q->wsum;
q->iwsum = ONE_FP / q->wsum;
inv_w = ONE_FP / weight;
weight = ONE_FP / inv_w;