Read Initial Placement

vpr/src/base/SetupVPR.cpp

@@ -639,6 +639,8 @@ static void SetupPlacerOpts(const t_options& Options, t_placer_opts* PlacerOpts)
 
     PlacerOpts->write_initial_place_file = Options.write_initial_place_file;
 
+    PlacerOpts->read_initial_place_file = Options.read_initial_place_file;
+
     PlacerOpts->pad_loc_type = Options.pad_loc_type;
 
     PlacerOpts->place_chan_width = Options.PlaceChanWidth;

vpr/src/base/read_options.cpp

@@ -1632,6 +1632,11 @@ argparse::ArgumentParser create_arg_parser(const std::string& prog_name, t_optio
         .metavar("INITIAL_PLACE_FILE")
         .show_in(argparse::ShowIn::HELP_ONLY);
 
+    file_grp.add_argument(args.read_initial_place_file, "--read_initial_place_file")
+        .help("Reads the initial placement and continues the rest of the placement process from there.")
+        .metavar("INITIAL_PLACE_FILE")
+        .show_in(argparse::ShowIn::HELP_ONLY);
+
     file_grp.add_argument(args.read_vpr_constraints_file, "--read_vpr_constraints")
         .help("Reads the floorplanning constraints that packing and placement must respect from the specified XML file.")
         .show_in(argparse::ShowIn::HELP_ONLY);

vpr/src/base/read_options.h

@@ -29,6 +29,7 @@ struct t_options {
     argparse::ArgValue<std::string> write_rr_graph_file;
     argparse::ArgValue<std::string> read_rr_graph_file;
     argparse::ArgValue<std::string> write_initial_place_file;
+    argparse::ArgValue<std::string> read_initial_place_file;
     argparse::ArgValue<std::string> read_vpr_constraints_file;
     argparse::ArgValue<std::string> write_vpr_constraints_file;
     argparse::ArgValue<std::string> write_constraints_file;

vpr/src/base/vpr_types.h

@@ -1236,6 +1236,7 @@ struct t_placer_opts {
     enum e_pad_loc_type pad_loc_type;
     std::string constraints_file;
     std::string write_initial_place_file;
+    std::string read_initial_place_file;
     enum pfreq place_freq;
     int recompute_crit_iter;
     int inner_loop_recompute_divider;

vpr/src/place/initial_placement.cpp

@@ -1187,12 +1187,12 @@ void initial_placement(const t_placer_opts& placer_opts,
     clear_all_grid_locs();
 
     /* Go through cluster blocks to calculate the tightest placement
-     * floorplan constraint for each constrained block
-     */
+    * floorplan constraint for each constrained block
+    */
     propagate_place_constraints();
 
     /*Mark the blocks that have already been locked to one spot via floorplan constraints
-     * as fixed, so they do not get moved during initial placement or later during the simulated annealing stage of placement*/
+    * as fixed, so they do not get moved during initial placement or later during the simulated annealing stage of placement*/
     mark_fixed_blocks();
 
     // Compute and store compressed floorplanning constraints
@@ -1204,17 +1204,22 @@ void initial_placement(const t_placer_opts& placer_opts,
         read_constraints(constraints_file);
     }
 
-    if (noc_opts.noc) {
-        // NoC routers are placed before other blocks
-        initial_noc_placement(noc_opts, placer_opts);
-        propagate_place_constraints();
-    }
+    if(!placer_opts.read_initial_place_file.empty()) {
+        const auto& grid = g_vpr_ctx.device().grid;
+        read_place(nullptr, placer_opts.read_initial_place_file.c_str(), false, grid);
+    } else {
+        if (noc_opts.noc) {
+            // NoC routers are placed before other blocks
+            initial_noc_placement(noc_opts, placer_opts);
+            propagate_place_constraints();
+        }
 
-    //Assign scores to blocks and placement macros according to how difficult they are to place
-    vtr::vector<ClusterBlockId, t_block_score> block_scores = assign_block_scores();
+        //Assign scores to blocks and placement macros according to how difficult they are to place
+        vtr::vector<ClusterBlockId, t_block_score> block_scores = assign_block_scores();
 
-    //Place all blocks
-    place_all_blocks(placer_opts, block_scores, placer_opts.pad_loc_type, constraints_file);
+        //Place all blocks
+        place_all_blocks(placer_opts, block_scores, placer_opts.pad_loc_type, constraints_file);
+    }
 
     alloc_and_load_movable_blocks();
 

vpr/src/place/place.cpp

@@ -462,7 +462,7 @@ void try_place(const Netlist<>& net_list,
     if (!placer_opts.write_initial_place_file.empty()) {
         print_place(nullptr,
                     nullptr,
-                    (placer_opts.write_initial_place_file + ".init.place").c_str());
+                    (placer_opts.write_initial_place_file).c_str());
     }
 
 #ifdef ENABLE_ANALYTIC_PLACE