rsz: extract detailed routing parasitics inside estimate_parasitics code

src/cts/src/CMakeLists.txt

@@ -85,6 +85,7 @@ target_link_libraries(cts_lib
     odb
     dbSta_lib
     OpenSTA
+    rcx_lib
     stt_lib
     utl_lib
 )

src/rsz/README.md

@@ -115,15 +115,17 @@ Standard Parasitic Exchange Format.
 
 ```tcl
 estimate_parasitics
-    -placement|-global_routing
+    -placement|-global_routing|-detailed_routing
     [-spef_file spef_file]
+    [-ext_model_file model_file]
 ```
 
 #### Options
 
 | Switch Name | Description |
 | ----- | ----- |
-| `-placement` or `-global_routing` | Either of these flags must be set. Parasitics are estimated based after placement stage versus after global routing stage. |
+| `-placement` or `-global_routing` or `-detailed_routing` | One of these flags must be set. Parasitics are estimated based on placement, global routing, or detailed routing. |
+| `-ext_model_file model_file` | Optional. File name to load the extraction model file for parasitics extraction from detailed routing. |
 | `-spef_file` | Optional. File name to write SPEF files. If more than one corner is available for the design, the files will be written as filename_corner.spef. |
 
 ### Set Don't Use

src/rsz/include/rsz/Resizer.hh

@@ -51,6 +51,10 @@ class GlobalRouter;
 class IncrementalGRoute;
 }  // namespace grt
 
+namespace rcx {
+class Ext;
+}  // namespace rcx
+
 namespace stt {
 class SteinerTreeBuilder;
 }
@@ -77,6 +81,8 @@ using stt::SteinerTreeBuilder;
 using grt::GlobalRouter;
 using grt::IncrementalGRoute;
 
+using rcx::Ext;
+
 using sta::ArcDelay;
 using sta::Cell;
 using sta::Corner;
@@ -194,6 +200,7 @@ class Resizer : public dbStaState
             SteinerTreeBuilder* stt_builder,
             GlobalRouter* global_router,
             dpl::Opendp* opendp,
+            rcx::Ext* openrcx,
             std::unique_ptr<AbstractSteinerRenderer> steiner_renderer);
   void setLayerRC(dbTechLayer* layer,
                   const Corner* corner,
@@ -240,9 +247,9 @@ class Resizer : public dbStaState
   double wireClkCapacitance(const Corner* corner) const;
   double wireClkHCapacitance(const Corner* corner) const;
   double wireClkVCapacitance(const Corner* corner) const;
-  void estimateParasitics(ParasiticsSrc src);
   void estimateParasitics(ParasiticsSrc src,
-                          std::map<Corner*, std::ostream*>& spef_streams_);
+                          std::map<Corner*, std::ostream*>& spef_streams_,
+                          const char* ext_model_path);
   void estimateWireParasitics(SpefWriter* spef_writer = nullptr);
   void estimateWireParasitic(const Net* net, SpefWriter* spef_writer = nullptr);
   void estimateWireParasitic(const Pin* drvr_pin,
@@ -592,7 +599,6 @@ class Resizer : public dbStaState
 
   void incrementalParasiticsBegin();
   void incrementalParasiticsEnd();
-  void ensureParasitics();
   void updateParasitics(bool save_guides = false);
   void ensureWireParasitic(const Pin* drvr_pin);
   void ensureWireParasitic(const Pin* drvr_pin, const Net* net);
@@ -710,6 +716,7 @@ class Resizer : public dbStaState
   SteinerTreeBuilder* stt_builder_ = nullptr;
   GlobalRouter* global_router_ = nullptr;
   IncrementalGRoute* incr_groute_ = nullptr;
+  Ext* openrcx_ = nullptr;
   dbNetwork* db_network_ = nullptr;
   dbDatabase* db_ = nullptr;
   dbBlock* block_ = nullptr;

src/rsz/src/CMakeLists.txt

@@ -79,6 +79,7 @@ target_link_libraries(rsz_lib
     OpenSTA
     dbSta_lib
     grt_lib
+    rcx_lib
     utl_lib
 )
 
@@ -91,6 +92,7 @@ target_link_libraries(rsz
     dbSta
     grt
     gui
+    rcx
     utl
 )
 

src/rsz/src/EstimateWireParasitics.cc

@@ -36,6 +36,7 @@
 #include "SteinerTree.hh"
 #include "db_sta/dbNetwork.hh"
 #include "grt/GlobalRouter.h"
+#include "rcx/ext.h"
 #include "rsz/Resizer.hh"
 #include "rsz/SpefWriter.hh"
 #include "sta/ArcDelayCalc.hh"
@@ -265,27 +266,18 @@ double Resizer::wireClkVCapacitance(const Corner* corner) const
 
 ////////////////////////////////////////////////////////////////
 
-void Resizer::ensureParasitics()
-{
-  estimateParasitics(global_router_->haveRoutes()
-                         ? ParasiticsSrc::global_routing
-                         : ParasiticsSrc::placement);
-}
-
-void Resizer::estimateParasitics(ParasiticsSrc src)
-{
-  std::map<Corner*, std::ostream*> spef_streams;
-  estimateParasitics(src, spef_streams);
-}
-
 void Resizer::estimateParasitics(ParasiticsSrc src,
-                                 std::map<Corner*, std::ostream*>& spef_streams)
+                                 std::map<Corner*, std::ostream*>& spef_streams,
+                                 const char* ext_model_path)
 {
   std::unique_ptr<SpefWriter> spef_writer;
   if (!spef_streams.empty()) {
     spef_writer = std::make_unique<SpefWriter>(logger_, sta_, spef_streams);
   }
 
+  rcx::Ext::ExtractOptions ext_options;
+  ext_options.ext_model_file = ext_model_path;
+
   switch (src) {
     case ParasiticsSrc::placement:
       estimateWireParasitics(spef_writer.get());
@@ -295,7 +287,8 @@ void Resizer::estimateParasitics(ParasiticsSrc src,
       parasitics_src_ = ParasiticsSrc::global_routing;
       break;
     case ParasiticsSrc::detailed_routing:
-      // TODO: call rcx to extract parasitics and load them to STA
+      openrcx_->extract(ext_options);
+      // TODO: load parasitics to STA
       parasitics_src_ = ParasiticsSrc::detailed_routing;
       break;
     case ParasiticsSrc::none:

src/rsz/src/MakeResizer.cc

@@ -74,6 +74,7 @@ void initResizer(OpenRoad* openroad)
                                openroad->getSteinerTreeBuilder(),
                                openroad->getGlobalRouter(),
                                openroad->getOpendp(),
+                               openroad->getOpenRCX(),
                                std::move(steiner_renderer));
   // Define swig TCL commands.
   Rsz_Init(interp);

src/rsz/src/Resizer.cc

@@ -47,6 +47,7 @@
 #include "RepairSetup.hh"
 #include "boost/multi_array.hpp"
 #include "db_sta/dbNetwork.hh"
+#include "rcx/ext.h"
 #include "sta/ArcDelayCalc.hh"
 #include "sta/Bfs.hh"
 #include "sta/Corner.hh"
@@ -156,6 +157,7 @@ void Resizer::init(Logger* logger,
                    SteinerTreeBuilder* stt_builder,
                    GlobalRouter* global_router,
                    dpl::Opendp* opendp,
+                   rcx::Ext* openrcx,
                    std::unique_ptr<AbstractSteinerRenderer> steiner_renderer)
 {
   opendp_ = opendp;
@@ -166,6 +168,7 @@ void Resizer::init(Logger* logger,
   stt_builder_ = stt_builder;
   global_router_ = global_router;
   incr_groute_ = nullptr;
+  openrcx_ = openrcx;
   db_network_ = sta->getDbNetwork();
   resized_multi_output_insts_ = InstanceSet(db_network_);
   inserted_buffer_set_ = InstanceSet(db_network_);

src/rsz/src/Resizer.i

@@ -338,40 +338,40 @@ wire_clk_capacitance(const Corner *corner)
 }
 
 void 
-estimate_parasitics_cmd(ParasiticsSrc src, const char* path)
+estimate_parasitics_cmd(ParasiticsSrc src, const char* spef_path, const char* ext_model_path)
 {
   ensureLinked();
   Resizer* resizer = getResizer();
   std::map<Corner*, std::ostream*> spef_files;
-  if (path != nullptr && std::strlen(path) > 0) {
-    std::string file_path(path);
-    if (!file_path.empty()) {
+  if (spef_path != nullptr && std::strlen(spef_path) > 0) {
+    std::string spef_file_path(spef_path);
+    if (!spef_file_path.empty()) {
       for (Corner* corner : *resizer->getDbNetwork()->corners()) {
-        file_path = path;
+        spef_file_path = spef_path;
         std::string suffix("_");
         suffix.append(corner->name());
-        if (file_path.find(".spef") != std::string::npos
-            || file_path.find(".SPEF") != std::string::npos) {
-          file_path.insert(file_path.size() - 5, suffix);
+        if (spef_file_path.find(".spef") != std::string::npos
+            || spef_file_path.find(".SPEF") != std::string::npos) {
+          spef_file_path.insert(spef_file_path.size() - 5, suffix);
         } else {
-          file_path.append(suffix);
+          spef_file_path.append(suffix);
         }
 
-        std::ofstream* file = new std::ofstream(file_path);
+        std::ofstream* spef_file = new std::ofstream(spef_file_path);
 
-        if (file->is_open()) {
-          spef_files[corner] = std::move(file);
+        if (spef_file->is_open()) {
+          spef_files[corner] = std::move(spef_file);
         } else {
           Logger* logger = ord::getLogger();
           logger->error(utl::RSZ,
                         7,
-                        "Can't open file " + file_path);
+                        "Can't open file " + spef_file_path);
         }
       }
     }
   }
 
-  resizer->estimateParasitics(src, spef_files);
+  resizer->estimateParasitics(src, spef_files, ext_model_path);
 
   for (auto [_, file] : spef_files) {
     file->flush();

src/rsz/src/Resizer.tcl

@@ -312,29 +312,40 @@ proc set_wire_rc { args } {
   }
 }
 
-sta::define_cmd_args "estimate_parasitics" { -placement|-global_routing \
-                                            [-spef_file filename]}
+sta::define_cmd_args "estimate_parasitics" { -placement|-global_routing|-detailed_routing \
+                                            [-spef_file spef_file] \
+                                            [-ext_model_file model_file]}
 
 proc estimate_parasitics { args } {
   sta::parse_key_args "estimate_parasitics" args \
-    keys {-spef_file} flags {-placement -global_routing}
+    keys {-spef_file -ext_model_file} flags {-placement -global_routing -detailed_routing}
 
-  set filename ""
+  set spef_file ""
   if { [info exists keys(-spef_file)] } {
-    set filename $keys(-spef_file)
+    set spef_file $keys(-spef_file)
+  }
+
+  set ext_model_file ""
+  if { [info exists keys(-ext_model_file)] } {
+    set ext_model_file $keys(-ext_model_file)
   }
 
   if { [info exists flags(-placement)] } {
     if { [rsz::check_corner_wire_cap] } {
-      rsz::estimate_parasitics_cmd "placement" $filename
+      rsz::estimate_parasitics_cmd "placement" $spef_file $ext_model_file
     }
   } elseif { [info exists flags(-global_routing)] } {
     if { [grt::have_routes] } {
       # should check for layer rc
-      rsz::estimate_parasitics_cmd "global_routing" $filename
+      rsz::estimate_parasitics_cmd "global_routing" $spef_file $ext_model_file
     } else {
       utl::error RSZ 5 "Run global_route before estimating parasitics for global routing."
     }
+  } elseif { [info exists flags(-detailed_routing)] } {
+    if { ![design_is_routed] } {
+      utl::error RSZ 87 "Design is not routed."
+    }
+    rsz::estimate_parasitics_cmd "detailed_routing" $spef_file $ext_model_file
   } else {
     utl::error RSZ 3 "missing -placement or -global_routing flag."
   }
@@ -613,9 +624,6 @@ proc repair_timing { args } {
   }
 
   set match_cell_footprint [info exists flags(-match_cell_footprint)]
-  if { [design_is_routed] } {
-    rsz::set_parasitics_src "detailed_routing"
-  }
 
   sta::check_argc_eq0 "repair_timing" $args
   rsz::check_parasitics

src/rsz/test/cpp/CMakeLists.txt

@@ -11,6 +11,7 @@ target_link_libraries(TestBufRem1
         rsz_lib
         grt_lib
         dpl_lib
+        rcx_lib
         stt_lib
         ${TCL_LIBRARY}
 )

src/rsz/test/cpp/TestBufferRemoval.cc

@@ -24,6 +24,7 @@
 #include "grt/GlobalRouter.h"
 #include "gtest/gtest.h"
 #include "odb/lefin.h"
+#include "rcx/ext.h"
 #include "rsz/MakeResizer.hh"
 #include "rsz/Resizer.hh"
 #include "sta/Corner.hh"
@@ -215,7 +216,8 @@ TEST_F(BufRemTest, SlackImproves)
   stt::SteinerTreeBuilder* stt = new stt::SteinerTreeBuilder;
   grt::GlobalRouter* grt = new grt::GlobalRouter;
   dpl::Opendp* dp = new dpl::Opendp;
-  resizer_->init(&logger_, db_.get(), sta_.get(), stt, grt, dp, nullptr);
+  rcx::Ext* rcx = new rcx::Ext;
+  resizer_->init(&logger_, db_.get(), sta_.get(), stt, grt, dp, rcx, nullptr);
 
   float origArrival
       = sta_->vertexArrival(outVertex_, sta::RiseFall::rise(), pathAnalysisPt_);