grt/rsz: write spef for estimated parasitics

src/grt/include/grt/GlobalRouter.h

@@ -76,7 +76,8 @@ class Opendp;
 
 namespace rsz {
 class Resizer;
-}
+class SpefWriter;
+}  // namespace rsz
 
 namespace sta {
 class dbSta;
@@ -195,7 +196,7 @@ class GlobalRouter : public ant::GlobalRouteSource
   bool isCoveringPin(Net* net, GSegment& segment);
   std::vector<Net*> initFastRoute(int min_routing_layer, int max_routing_layer);
   void initFastRouteIncr(std::vector<Net*>& nets);
-  void estimateRC();
+  void estimateRC(rsz::SpefWriter* spef_writer = nullptr);
   void estimateRC(odb::dbNet* db_net);
   // Return GRT layer lengths in dbu's for db_net's route indexed by routing
   // layer.

src/grt/src/GlobalRouter.cpp

@@ -65,6 +65,8 @@
 #include "odb/db.h"
 #include "odb/dbShape.h"
 #include "odb/wOrder.h"
+#include "rsz/Resizer.hh"
+#include "rsz/SpefWriter.hh"
 #include "sta/Clock.hh"
 #include "sta/MinMax.hh"
 #include "sta/Parasitics.hh"
@@ -447,7 +449,7 @@ NetRouteMap GlobalRouter::findRouting(std::vector<Net*>& nets,
   return routes;
 }
 
-void GlobalRouter::estimateRC()
+void GlobalRouter::estimateRC(rsz::SpefWriter* spef_writer)
 {
   // Remove any existing parasitics.
   sta_->deleteParasitics();
@@ -457,12 +459,11 @@ void GlobalRouter::estimateRC()
 
   MakeWireParasitics builder(
       logger_, resizer_, sta_, db_->getTech(), block_, this);
-  for (auto& net_route : routes_) {
-    odb::dbNet* db_net = net_route.first;
-    GRoute& route = net_route.second;
+
+  for (auto& [db_net, route] : routes_) {
     if (!route.empty()) {
       Net* net = getNet(db_net);
-      builder.estimateParasitcs(db_net, net->getPins(), route);
+      builder.estimateParasitcs(db_net, net->getPins(), route, spef_writer);
     }
   }
 }

src/grt/src/MakeWireParasitics.cpp

@@ -38,6 +38,7 @@
 #include "db_sta/dbNetwork.hh"
 #include "db_sta/dbSta.hh"
 #include "rsz/Resizer.hh"
+#include "rsz/SpefWriter.hh"
 #include "sta/ArcDelayCalc.hh"
 #include "sta/Corner.hh"
 #include "sta/Parasitics.hh"
@@ -76,7 +77,8 @@ MakeWireParasitics::MakeWireParasitics(utl::Logger* logger,
 
 void MakeWireParasitics::estimateParasitcs(odb::dbNet* net,
                                            std::vector<Pin>& pins,
-                                           GRoute& route)
+                                           GRoute& route,
+                                           rsz::SpefWriter* spef_writer)
 {
   debugPrint(logger_, GRT, "est_rc", 1, "net {}", net->getConstName());
   if (logger_->debugCheck(GRT, "est_rc", 2)) {
@@ -105,6 +107,11 @@ void MakeWireParasitics::estimateParasitcs(odb::dbNet* net,
     makeRouteParasitics(
         net, route, sta_net, corner, analysis_point, parasitic, node_map);
     makeParasiticsToPins(pins, node_map, corner, analysis_point, parasitic);
+
+    if (spef_writer) {
+      spef_writer->writeNet(corner, sta_net, parasitic);
+    }
+
     arc_delay_calc_->reduceParasitic(
         parasitic, sta_net, corner, sta::MinMaxAll::all());
   }

src/grt/src/MakeWireParasitics.h

@@ -65,7 +65,8 @@ class Logger;
 
 namespace rsz {
 class Resizer;
-}
+class SpefWriter;
+}  // namespace rsz
 
 namespace grt {
 
@@ -80,7 +81,8 @@ class MakeWireParasitics : public AbstractMakeWireParasitics
                      GlobalRouter* grouter);
   void estimateParasitcs(odb::dbNet* net,
                          std::vector<Pin>& pins,
-                         GRoute& route);
+                         GRoute& route,
+                         rsz::SpefWriter* spef_writer = nullptr);
   void estimateParasitcs(odb::dbNet* net, GRoute& route) override;
 
   void clearParasitics() override;

src/grt/test/est_rc4.ok

@@ -100,3 +100,5 @@ Load pins
  _891_/CK input (DFF_X1) 0.856-0.950 (36, 26)
  _892_/CK input (DFF_X1) 0.856-0.950 (53, 38)
 
+No differences found.
+No differences found.

src/grt/test/est_rc4.tcl

@@ -16,7 +16,10 @@ set_layer_rc -corner corner1 -layer metal3 -resistance 4 -capacitance 2
 set_layer_rc -corner corner1 -layer metal4 -resistance 4 -capacitance 2
 
 set_routing_layers -signal metal2-metal10
-estimate_parasitics -global_routing
+estimate_parasitics -global_routing -spef_file results/est_rc4.spef
 
 report_net -corner corner0 -digits 3 clk
 report_net -corner corner1 -digits 3 clk
+
+diff_file est_rc4_corner0.spefok results/est_rc4_corner0.spef
+diff_file est_rc4_corner1.spefok results/est_rc4_corner1.spef