[AP] Removed Old Cluster-Level AP Flow

Prior to the flat AP flow, a cluster-level AP flow existed in VPR which
performed a SimPL-style algorithm on the clusters created during packing
before performing a placement quench.

Although well-written, this flow was not shown to outperform the SA
placer in VPR. It has also been becoming confusing to keep in VPR since
the new flat AP flow supercedes it. It is unclear if a cluster-level AP
flow will work well with the flat AP flow; however in that case the
cluster-level AP flow would be made using the new AP APIs written.

Removed the old cluster-level AP flow to reduce confusion.

Author: AlexandreSinger

CMakeLists.txt

@@ -42,9 +42,6 @@ option(VTR_ENABLE_CAPNPROTO "Enable capnproto binary serialization support in VP
 #Allow the user to decide whether to compile the server module
 option(VPR_USE_SERVER "Specify whether vpr enables the server mode" ON)
 
-#Allow the user to enable/disable VPR analytic placement
-#VPR option --enable_analytic_placer is also required for Analytic Placement
-option(VPR_ANALYTIC_PLACE "Enable analytic placement in VPR." ON)
 option(VPR_ENABLE_INTERCHANGE "Enable FPGA interchange." ON)
 option(VPR_ENABLE_NOC_SAT_ROUTING "Enable NoC SAT routing." OFF)
 

vpr/CMakeLists.txt

@@ -91,21 +91,6 @@ else ()
     message(STATUS "Eigen3: Not Found. Some features may be disabled.")
 endif (TARGET Eigen3::Eigen)
 
-#VPR_ANALYTIC_PLACE is initialized in the root CMakeLists
-# NOTE: This is the cluster-level Analytical Placement which existed before the
-#       flat Analytical Placement flow.
-if(${VPR_ANALYTIC_PLACE})
-	message(STATUS "VPR Analytic Placement: Requested")
-	if (TARGET Eigen3::Eigen)
-		message(STATUS "VPR Analytic Placement dependency (Eigen3): Found")
-		message(STATUS "VPR Analytic Placement: Enabled")
-		target_compile_definitions(libvpr PUBLIC -DENABLE_ANALYTIC_PLACE)
-	else ()
-		message(STATUS "VPR Analytic Placement dependency (Eigen3): Not Found (Download manually with sudo apt install libeigen3-dev, and rebuild)")
-		message(STATUS "VPR Analytic Placement: Disabled")
-	endif(TARGET Eigen3::Eigen)
-endif()
-
 if (${VPR_ENABLE_NOC_SAT_ROUTING})
     message(STATUS "VPR NoC SAT Routing: Requested")
     find_package(ortools CONFIG REQUIRED)

vpr/src/base/SetupVPR.cpp

@@ -673,7 +673,6 @@ static void SetupPlacerOpts(const t_options& Options, t_placer_opts* PlacerOpts)
 
     PlacerOpts->effort_scaling = Options.place_effort_scaling;
     PlacerOpts->timing_update_type = Options.timing_update_type;
-    PlacerOpts->enable_analytic_placer = Options.enable_analytic_placer;
     PlacerOpts->place_static_move_prob = vtr::vector<e_move_type, float>(Options.place_static_move_prob.value().begin(),
                                                                          Options.place_static_move_prob.value().end());
     PlacerOpts->place_high_fanout_net = Options.place_high_fanout_net;

vpr/src/base/read_options.cpp

@@ -2244,13 +2244,6 @@ argparse::ArgumentParser create_arg_parser(const std::string& prog_name, t_optio
         .default_value("0")
         .show_in(argparse::ShowIn::HELP_ONLY);
 
-    place_grp.add_argument(args.enable_analytic_placer, "--enable_analytic_placer")
-        .help(
-            "Enables the analytic placer. "
-            "Once analytic placement is done, the result is passed through the quench phase of the annealing placer for local improvement")
-        .default_value("false")
-        .show_in(argparse::ShowIn::HELP_ONLY);
-
     place_grp.add_argument(args.place_static_move_prob, "--place_static_move_prob")
         .help(
             "The percentage probabilities of different moves in Simulated Annealing placement. "

vpr/src/base/read_options.h

@@ -139,7 +139,6 @@ struct t_options {
     argparse::ArgValue<int> placement_saves_per_temperature;
     argparse::ArgValue<e_place_effort_scaling> place_effort_scaling;
     argparse::ArgValue<e_place_delta_delay_algorithm> place_delta_delay_matrix_calculation_method;
-    argparse::ArgValue<bool> enable_analytic_placer;
     argparse::ArgValue<std::vector<float>> place_static_move_prob;
     argparse::ArgValue<int> place_high_fanout_net;
     argparse::ArgValue<e_place_bounding_box_mode> place_bounding_box_mode;

vpr/src/base/vpr_types.h

@@ -1071,14 +1071,6 @@ struct t_placer_opts {
     std::string allowed_tiles_for_delay_model;
 
     e_place_delta_delay_algorithm place_delta_delay_matrix_calculation_method;
-
-    /*
-     * @brief enables the analytic placer.
-     *
-     * Once analytic placement is done, the result is passed through the quench phase
-     * of the annealing placer for local improvement
-     */
-    bool enable_analytic_placer;
 };
 
 /******************************************************************