deepcopy overide for instance

compiler/base/geometry.py

@@ -200,9 +200,17 @@ class instance(geometry):
                 self.width = round_to_grid(mod.width)
                 self.height = round_to_grid(mod.height)
         self.compute_boundary(offset, mirror, rotate)
-
         debug.info(4, "creating instance: " + self.name)
 
+    def __deepcopy__(original, memo):
+        new_inst = instance(original.name+"_copy", original.mod)
+        new_inst.rotate = original.rotate
+        new_inst.offset = original.offset
+        new_inst.mirror = original.mirror
+        new_inst.is_bitcell = original.is_bitcell
+        return new_inst
+
+
     def get_blockages(self, lpp, top=False):
         """ Retrieve blockages of all modules in this instance.
         Apply the transform of the instance placement to give absolute blockages."""

compiler/base/hierarchy_layout.py

@@ -479,7 +479,6 @@ class layout():
 
     def add_existing_inst(self, inst, name):
         new_inst = deepcopy(inst)
-        new_inst.mod = inst.mod
         self.mods.add(new_inst.mod)
         if name:
             new_inst.name = name