mpl: adjust tree size before computing min/max cluster sizes

If we are going to set the tree to one level then do so before we pick
the min/max cluster sizes.

Signed-off-by: Matt Liberty <mliberty@precisioninno.com>

Author: maliberty

src/mpl/src/clusterEngine.cpp

@@ -311,6 +311,21 @@ void ClusteringEngine::setBaseThresholds()
 {
   if (tree_->base_max_macro <= 0 || tree_->base_min_macro <= 0
       || tree_->base_max_std_cell <= 0 || tree_->base_min_std_cell <= 0) {
+    // From original implementation: Reset maximum level based on number
+    // of macros.
+    const int min_num_macros_for_multilevel = 150;
+    if (design_metrics_->getNumMacro() <= min_num_macros_for_multilevel) {
+      tree_->max_level = 1;
+      debugPrint(
+          logger_,
+          MPL,
+          "multilevel_autoclustering",
+          1,
+          "Number of macros is below {}. Resetting number of levels to {}",
+          min_num_macros_for_multilevel,
+          tree_->max_level);
+    }
+
     // Set base values for std cell lower/upper thresholds
     const int min_num_std_cells_allowed = 1000;
     tree_->base_min_std_cell
@@ -331,21 +346,6 @@ void ClusteringEngine::setBaseThresholds()
     }
     tree_->base_max_macro
         = tree_->base_min_macro * tree_->cluster_size_ratio / 2.0;
-
-    // From original implementation: Reset maximum level based on number
-    // of macros.
-    const int min_num_macros_for_multilevel = 150;
-    if (design_metrics_->getNumMacro() <= min_num_macros_for_multilevel) {
-      tree_->max_level = 1;
-      debugPrint(
-          logger_,
-          MPL,
-          "multilevel_autoclustering",
-          1,
-          "Number of macros is below {}. Resetting number of levels to {}",
-          min_num_macros_for_multilevel,
-          tree_->max_level);
-    }
   }
 
   // Set sizes for root