ifp: remove old tracks when floorplan is changed

Signed-off-by: Peter Gadfort <peter.gadfort@gmail.com>

Author: gadfort

src/ifp/include/ifp/InitFloorplan.hh

@@ -126,6 +126,7 @@ class InitFloorplan
                             int y_offset,
                             int y_pitch,
                             int first_last_pitch);
+  void resetTracks() const;
 
   odb::dbSite* findSite(const char* site_name);
 

src/ifp/src/InitFloorplan.cc

@@ -186,6 +186,8 @@ void InitFloorplan::makeDie(const odb::Rect& die)
                 snapToMfgGrid(die.xMax()),
                 snapToMfgGrid(die.yMax()));
   block_->setDieArea(die_area);
+
+  resetTracks();
 }
 
 void InitFloorplan::makePolygonDie(const odb::Polygon& polygon)
@@ -214,6 +216,8 @@ void InitFloorplan::makePolygonDie(const odb::Polygon& polygon)
 
   // Set the die area using the polygon
   block_->setDieArea(polygon);
+
+  resetTracks();
 }
 
 void InitFloorplan::makePolygonRows(
@@ -977,6 +981,16 @@ void InitFloorplan::makeTracks()
   }
 }
 
+void InitFloorplan::resetTracks() const
+{
+  for (auto layer : block_->getDataBase()->getTech()->getLayers()) {
+    auto grid = block_->findTrackGrid(layer);
+    if (grid) {
+      odb::dbTrackGrid::destroy(grid);
+    }
+  }
+}
+
 void InitFloorplan::makeTracks(odb::dbTechLayer* layer,
                                int x_offset,
                                int x_pitch,

src/ifp/test/BUILD

@@ -18,6 +18,7 @@ COMPULSORY_TESTS = [
     "init_floorplan8",
     "init_floorplan9",
     "init_floorplan10",
+    "init_floorplan11",
     "init_floorplan_dbl_row",
     "init_floorplan_even_rows",
     "init_floorplan_flip_sites",

src/ifp/test/CMakeLists.txt

@@ -13,6 +13,7 @@ or_integration_tests(
     init_floorplan8
     init_floorplan9
     init_floorplan10
+    init_floorplan11
     init_floorplan_dbl_row
     init_floorplan_even_rows
     init_floorplan_flip_sites

src/ifp/test/init_floorplan11.defok

@@ -0,0 +1,6 @@
+[INFO ODB-0227] LEF file: Nangate45/Nangate45.lef, created 22 layers, 27 vias, 135 library cells
+[WARNING IFP-0028] Core area lower left (110.000, 110.000) snapped to (110.010, 110.600).
+[INFO IFP-0001] Added 563 rows of 4157 site FreePDK45_38x28_10R_NP_162NW_34O.
+[WARNING IFP-0028] Core area lower left (110.000, 110.000) snapped to (110.010, 110.600).
+[INFO IFP-0001] Added 271 rows of 1999 site FreePDK45_38x28_10R_NP_162NW_34O.
+No differences found.

src/ifp/test/init_floorplan11.ok

@@ -0,0 +1,20 @@
+# init_floorplan ensure only one set of tracks appear after initialize_floorplan
+source "helpers.tcl"
+read_lef Nangate45/Nangate45.lef
+read_liberty Nangate45/Nangate45_typ.lib
+read_verilog reg1.v
+link_design top
+initialize_floorplan -die_area "0 0 1000 1000" \
+  -core_area "110 110 900 900" \
+  -site FreePDK45_38x28_10R_NP_162NW_34O
+make_tracks
+
+# Repeat with diffent size
+initialize_floorplan -die_area "0 0 500 500" \
+  -core_area "110 110 490 490" \
+  -site FreePDK45_38x28_10R_NP_162NW_34O
+make_tracks
+
+set def_file [make_result_file init_floorplan11.def]
+write_def $def_file
+diff_files init_floorplan11.defok $def_file