Add a regex to find overall cell count from design stats.

PiperOrigin-RevId: 588557432

xls/tools/gather_design_stats.py

@@ -56,6 +56,7 @@ def scrape_yosys(model: design_stats_pb2.DesignStats, f):
   flop_regex = re.compile(r"Flop count p(\d+)mod: (\d+) objects.")
   flop_total_regex = re.compile(r"Flop count: (\d+) objects.")
   cell_count_regex = re.compile(r"Cell count in p(\d+)mod: (\d+)")
+  total_cell_count_regex = re.compile(r"Number of cells:\s+(\d+)")
   longest_path_regex = re.compile(
       r"Longest topological path in p(\d+)mod \(length=(\d+)\)"
   )
@@ -100,6 +101,12 @@ def scrape_yosys(model: design_stats_pb2.DesignStats, f):
       ensure_stage(model, stage)
       model.per_stage[stage].cells = cells
 
+    # Number of cells:        189
+    if not model.overall.cells:
+      if m := re.search(total_cell_count_regex, line):
+        cells = int(m.group(1))
+        model.overall.cells = cells
+
     # Longest topological path in p0mod (length=1):
     if m := re.search(longest_path_regex, line):
       stage = int(m.group(1))

xls/tools/testdata/find_index_5ps_model_unit_expected.textproto

@@ -1,6 +1,7 @@
 overall {
   area_um2: 740.7104
   flops: 27
+  cells: 63
   crit_path_delay_ps: 471.97
 }
 per_stage {