Merge pull request #8411 from AcKoucher/mpl-perturbations

mpl: ensure number of perturbations increase for large arrays

Author: eder-matheus

src/mpl/src/hier_rtlmp.cpp

@@ -2097,11 +2097,13 @@ void HierRTLMP::placeMacros(Cluster* cluster)
 
   const int number_of_sequence_pair_macros
       = static_cast<int>(hard_macros.size());
+  const int minimum_perturbations_per_step = num_perturb_per_step_ / 10;
+  const bool large_macro_cluster
+      = number_of_sequence_pair_macros > minimum_perturbations_per_step;
 
-  int num_perturb_per_step
-      = (number_of_sequence_pair_macros > num_perturb_per_step_ / 10)
-            ? number_of_sequence_pair_macros
-            : num_perturb_per_step_ / 10;
+  int perturbations_per_step = large_macro_cluster
+                                   ? number_of_sequence_pair_macros
+                                   : minimum_perturbations_per_step;
 
   SequencePair initial_seq_pair;
   if (cluster->isArrayOfInterconnectedMacros()) {
@@ -2114,8 +2116,8 @@ void HierRTLMP::placeMacros(Cluster* cluster)
     exchange_swap_prob = 1.0f;
 
     // Large arrays need more steps to properly converge.
-    if (number_of_sequence_pair_macros > num_perturb_per_step) {
-      num_perturb_per_step *= 2;
+    if (large_macro_cluster) {
+      perturbations_per_step *= 2;
     }
   }
 
@@ -2151,7 +2153,7 @@ void HierRTLMP::placeMacros(Cluster* cluster)
                                               exchange_swap_prob,
                                               init_prob_,
                                               max_num_step_,
-                                              num_perturb_per_step,
+                                              perturbations_per_step,
                                               random_seed_ + run_id,
                                               graphics_.get(),
                                               logger_,