fix aggregate bandwidth weighting factor command line option

vpr/src/base/SetupVPR.cpp

@@ -741,8 +741,6 @@ static void SetupNocOpts(const t_options& Options, t_noc_opts* NocOpts) {
     NocOpts->noc_congestion_weighting = Options.noc_congestion_weighting;
     NocOpts->noc_swap_percentage = Options.noc_swap_percentage;
     NocOpts->noc_placement_file_name = Options.noc_placement_file_name;
-
-    return;
 }
 
 static void find_ipin_cblock_switch_index(const t_arch& Arch, int& wire_to_arch_ipin_switch, int& wire_to_arch_ipin_switch_between_dice) {

vpr/src/base/ShowSetup.cpp

@@ -608,7 +608,7 @@ static void ShowPlacerOpts(const t_placer_opts& PlacerOpts,
         }
 
         VTR_LOG("PlacerOpts.constraints_file: ");
-        if (PlacerOpts.constraints_file == "") {
+        if (PlacerOpts.constraints_file.empty()) {
             VTR_LOG("No constraints file given\n");
         } else {
             VTR_LOG("Using constraints file '%s'\n", PlacerOpts.constraints_file.c_str());
@@ -795,6 +795,7 @@ static void ShowNocOpts(const t_noc_opts& NocOpts) {
     VTR_LOG("NocOpts.noc_flows_file: %s\n", NocOpts.noc_flows_file.c_str());
     VTR_LOG("NocOpts.noc_routing_algorithm: %s\n", NocOpts.noc_routing_algorithm.c_str());
     VTR_LOG("NocOpts.noc_placement_weighting: %f\n", NocOpts.noc_placement_weighting);
+    VTR_LOG("NocOpts.noc_aggregate_bandwidth_weighting: %f\n", NocOpts.noc_aggregate_bandwidth_weighting);
     VTR_LOG("NocOpts.noc_latency_constraints_weighting: %f\n", NocOpts.noc_latency_constraints_weighting);
     VTR_LOG("NocOpts.noc_latency_weighting: %f\n", NocOpts.noc_latency_weighting);
     VTR_LOG("NocOpts.noc_congestion_weighting: %f\n", NocOpts.noc_congestion_weighting);

vpr/src/base/read_options.cpp

@@ -2823,10 +2823,13 @@ argparse::ArgumentParser create_arg_parser(std::string prog_name, t_options& arg
         .default_value("5.0")
         .show_in(argparse::ShowIn::HELP_ONLY);
 
-    noc_grp.add_argument<double>(args.noc_latency_constraints_weighting, "--noc_aggregate_bandwidth_weighting")
+    noc_grp.add_argument<double>(args.noc_agg_bandwidth_weighting, "--noc_aggregate_bandwidth_weighting")
         .help(
-            "Controls the importance of meeting all the NoC traffic flow latency constraints."
-            "This value can be >=0, where 0 would mean the latency constraints have no relevance to placement, a value of 1 would mean the latency constraints are weighted equally to the sum of other placement cost components and a value greater than 1 would mean the placement is increasingly dominated by meeting the latency constraints of the traffic flows.")
+            "Controls the importance of minimizing the NoC aggregate bandwidth.\n"
+            "This value can be >=0, where 0 would mean the aggregate bandwidth has no relevance to placement.\n"
+            "Other positive numbers specify the importance of minimizing the NoC aggregate bandwidth to other NoC-related cost terms.\n"
+            "Weighting factors for NoC-related cost terms are normalized internally. Therefore, their absolute values are not important, and"
+            "only their relative ratios determine the importance of each cost term.")
         .default_value("0.38")
         .show_in(argparse::ShowIn::HELP_ONLY);