DRT: handle guides below the bottom routing layer

src/drt/src/io/GuideProcessor.cpp

@@ -652,9 +652,8 @@ bool GuideProcessor::isValidGuideLayerNum(odb::dbGuide* db_guide,
       const bool one_gcell_guide
           = getDesign()->getTopBlock()->getGCellIdx(guide_rect.ll())
             == getDesign()->getTopBlock()->getGCellIdx(guide_rect.ur());
-      if (!one_gcell_guide) {
-        // TODO: uncomment this when GRT issue is solved
-        // error = true;  // not a valid via access guide
+      if (!one_gcell_guide && router_cfg_->DBPROCESSNODE != "ISPD") {
+        error = true;  // not a valid via access guide
       }
     }
     // else I don't know how many gcells the guide spans
@@ -1265,19 +1264,26 @@ void GuideProcessor::genGuides_split(
                                 is_horizontal,
                                 rects);
             auto prev_idx_it = curr_idx_it++;
+            const bool via_only
+                = (layer_num < router_cfg_->BOTTOM_ROUTING_LAYER
+                   && router_cfg_->DBPROCESSNODE != "ISPD")
+                  || (via_access_only
+                      && layer_num <= router_cfg_->VIA_ACCESS_LAYERNUM);
             while (curr_idx_it != split_indices.end()) {
               split::addSplitRect(track_idx,
                                   *curr_idx_it,
                                   *curr_idx_it,
                                   layer_num,
                                   is_horizontal,
                                   rects);
-              split::addSplitRect(track_idx,
-                                  *prev_idx_it,
-                                  *curr_idx_it,
-                                  layer_num,
-                                  is_horizontal,
-                                  rects);
+              if (!via_only) {
+                split::addSplitRect(track_idx,
+                                    *prev_idx_it,
+                                    *curr_idx_it,
+                                    layer_num,
+                                    is_horizontal,
+                                    rects);
+              }
               prev_idx_it = curr_idx_it++;
             }
           }

src/drt/test/ispd18_sample.py

@@ -22,6 +22,7 @@
     output_drc=drc_file,
     output_maze=maze_file,
     output_guide_coverage=guide_coverage_file,
+    db_process_node="ISPD",
     verbose=0,
 )
 

src/drt/test/ispd18_sample.tcl

@@ -6,6 +6,7 @@ read_guides testcase/ispd18_sample/ispd18_sample.input.guide
 detailed_route -output_drc [make_result_file ispd18_sample.output.drc.rpt] \
   -output_maze [make_result_file ispd18_sample.output.maze.log] \
   -output_guide_coverage [make_result_file ispd18_sample.coverage.csv] \
+  -db_process_node ISPD \
   -verbose 0
 
 set def_file [make_result_file ispd18_sample.def]

src/drt/test/ispd18_sample_incr.tcl

@@ -6,12 +6,14 @@ read_guides testcase/ispd18_sample/ispd18_sample.input.guide
 detailed_route -output_drc [make_result_file ispd18_sample.output.drc.rpt] \
   -output_maze [make_result_file ispd18_sample.output.maze.log] \
   -output_guide_coverage [make_result_file ispd18_sample.coverage.csv] \
+  -db_process_node ISPD \
   -verbose 0
 set net [[ord::get_db_block] findNet "net1231"]
 odb::dbWire_destroy [$net getWire]
 detailed_route -output_drc [make_result_file ispd18_sample.output.drc.rpt] \
   -output_maze [make_result_file ispd18_sample.output.maze.log] \
   -output_guide_coverage [make_result_file ispd18_sample.coverage.csv] \
+  -db_process_node ISPD \
   -verbose 0
 set def_file [make_result_file ispd18_sample.def]
 write_def $def_file

src/drt/test/run-ispd.py

@@ -78,6 +78,7 @@ def gen_files(work_dir, ispd_year, design, drv_min, drv_max):
             read_guides {bench_dir}/{design}/{design}.input.guide 
             detailed_route -output_maze {design_dir}/{design}.output.maze.log \\
                            -output_drc {design_dir}/{design}.output.drc.rpt \\
+                           -db_process_node ISPD \\
                            -verbose {verbose}
             write_def {design_dir}/{design}.output.def
             set drv_count [detailed_route_num_drvs]

src/drt/test/single_step.py

@@ -21,6 +21,7 @@
     output_drc=drc_file,
     output_maze=maze_file,
     verbose=0,
+    db_process_node="ISPD",
     single_step_dr=True,
 )
 

src/drt/test/single_step.tcl

@@ -7,6 +7,7 @@ read_guides testcase/ispd18_sample/ispd18_sample.input.guide
 detailed_route -output_drc [make_result_file single_step.output.drc.rpt] \
   -output_maze [make_result_file single_step.output.maze.log] \
   -verbose 0 \
+  -db_process_node ISPD \
   -single_step_dr
 
 drt::step_dr 7 0 3 8 0 8 0.95 1 true