grt: update set_global_routing_layer_adjustment to allow increasing capacity with negative adjustment values

Signed-off-by: Eder Monteiro <[email protected]>

Author: eder-matheus

src/grt/src/GlobalRouter.cpp

@@ -1618,6 +1618,7 @@ void GlobalRouter::computeUserLayerAdjustments(int max_routing_layer)
     odb::dbTechLayer* tech_layer = db_->getTech()->findRoutingLayer(layer);
     float adjustment = tech_layer->getLayerAdjustment();
     if (adjustment != 0) {
+      const bool is_reduce = adjustment > 0;
       if (horizontal_capacities_[layer - 1] != 0) {
         int new_cap = hor_capacities[layer - 1] * (1 - adjustment);
         grid_->setHorizontalCapacity(new_cap, layer - 1);
@@ -1632,7 +1633,7 @@ void GlobalRouter::computeUserLayerAdjustments(int max_routing_layer)
                                  ? std::max(new_h_capacity, 1)
                                  : new_h_capacity;
             fastroute_->addAdjustment(
-                x - 1, y - 1, x, y - 1, layer, new_h_capacity, true);
+                x - 1, y - 1, x, y - 1, layer, new_h_capacity, is_reduce);
           }
         }
       }
@@ -1651,7 +1652,7 @@ void GlobalRouter::computeUserLayerAdjustments(int max_routing_layer)
                                  ? std::max(new_v_capacity, 1)
                                  : new_v_capacity;
             fastroute_->addAdjustment(
-                x - 1, y - 1, x - 1, y, layer, new_v_capacity, true);
+                x - 1, y - 1, x - 1, y, layer, new_v_capacity, is_reduce);
           }
         }
       }

src/grt/src/GlobalRouter.tcl

@@ -12,21 +12,21 @@ proc set_global_routing_layer_adjustment { args } {
     lassign $args layer adj
 
     if { $layer == "*" } {
-      sta::check_positive_float "adjustment" $adj
+      sta::check_float "adjustment" $adj
       grt::set_capacity_adjustment $adj
     } elseif { [regexp -all {([^-]+)-([^ ]+)} $layer] } {
       lassign [grt::parse_layer_range "set_global_routing_layer_adjustment" \
         $layer] first_layer last_layer
       for { set l $first_layer } { $l <= $last_layer } { incr l } {
         grt::check_routing_layer $l
-        sta::check_positive_float "adjustment" $adj
+        sta::check_float "adjustment" $adj
 
         grt::add_layer_adjustment $l $adj
       }
     } else {
       set layer_idx [grt::parse_layer_name $layer]
       grt::check_routing_layer $layer_idx
-      sta::check_positive_float "adjustment" $adj
+      sta::check_float "adjustment" $adj
 
       grt::add_layer_adjustment $layer_idx $adj
     }