I have some questions about extra-cost-table for quite a long time, which is:
1. is extra-cost-table (-xt) helpful to kill dense, congest design warning? (WARNING:Route:464)
2. for a fixed cost-table option (-t), can larger -xt number can get a better PR result? For example, -t=3, -xt=2 is better than -xt=1; and -xt=5 is better than-xt=3?
3. in smartxplorer, -cr option means loop -xt = 0/1/2/3/4/5?
Thanks!
