about update_net_weights

[lancexiang]

vtr-verilog-to-routing/vpr/src/analytical_place/analytical_solver.cpp

Line 1207 in 66c60f1

void B2BSolver::update_net_weights(const PreClusterTimingManager& pre_cluster_timing_manager) {

Can i used QPHybridSolver::update_net_weights to replace this empty method? More, in this method, when net_is_ignored, whether should be '1.0f - ap_timing_tradeoff_' equal to crit=0, not 1?

[AlexandreSinger]

Hi @lancexiang , the code you are referencing is under active development and is experimental. It is currently in progress to become cleaner and production ready in the VTR flow.

The QPHybridSolver uses a standard net weighting scheme which just gives more weight to critical nets. The B2BSolver (in this code-base) uses a more complex timing weighting scheme which is currently under active development; I do not recommend modifying it at this moment.

Finally, regarding what occurs when the net is ignored; the weight of these nets do not matter in this case since ignored nets are not added to the equations that the solver will optimize for. As such, we leave their weight at the default value of 1.

I hope this answers your questions!

Best,
Alex