[vpr][CLI] change has_choking_spot to router_opt_choke_points

Author: amin1377

vpr/src/base/SetupVPR.cpp

@@ -510,7 +510,7 @@ static void SetupRouterOpts(const t_options& Options, t_router_opts* RouterOpts)
     RouterOpts->max_logged_overused_rr_nodes = Options.max_logged_overused_rr_nodes;
     RouterOpts->generate_rr_node_overuse_report = Options.generate_rr_node_overuse_report;
     RouterOpts->flat_routing = Options.flat_routing;
-    RouterOpts->has_choking_spot = Options.has_choking_spot;
+    RouterOpts->has_choking_spot = Options.router_opt_choke_points;
     RouterOpts->custom_3d_sb_fanin_fanout = Options.custom_3d_sb_fanin_fanout;
     RouterOpts->with_timing_analysis = Options.timing_analysis;
 }

vpr/src/base/read_options.cpp

@@ -2491,13 +2491,13 @@ argparse::ArgumentParser create_arg_parser(const std::string& prog_name, t_optio
         .default_value("off")
         .show_in(argparse::ShowIn::HELP_ONLY);
 
-    route_grp.add_argument(args.has_choking_spot, "--has_choking_spot")
+    route_grp.add_argument<bool, ParseOnOff>(args.router_opt_choke_points, "--router_opt_choke_points")
         .help(
             ""
-            "Some FPGA architectures, due to the lack of full connectivity inside the cluster, may have"
-            " a choking spot inside the cluster. Thus, if routing doesn't converge, enabling this option may"
-            " help it.")
-        .default_value("false")
+            "Some FPGA architectures with limited fan-out options within a cluster (e.g. fracturable LUTs with shared pins) do" 
+            " not converge well in routing unless these fan-out choke points are discovered and optimized for during net routing." 
+            " This option helps router convergence for such architectures.")
+        .default_value("on")
         .show_in(argparse::ShowIn::HELP_ONLY);
 
 

vpr/src/base/read_options.h

@@ -218,7 +218,7 @@ struct t_options {
     argparse::ArgValue<int> reorder_rr_graph_nodes_threshold;
     argparse::ArgValue<int> reorder_rr_graph_nodes_seed;
     argparse::ArgValue<bool> flat_routing;
-    argparse::ArgValue<bool> has_choking_spot;
+    argparse::ArgValue<bool> router_opt_choke_points;
     argparse::ArgValue<int> route_verbosity;
     argparse::ArgValue<int> custom_3d_sb_fanin_fanout;