A PG wire routing optimization tool for more efficiently routing PG wires in a layout design of an integrated circuit. The PG wire routing optimization tool analyzes a routing of the wires of a power and ground network for unacceptable IR-drops or electromigration problems. If one or more problems are discovered, the PG wire routing optimization tool determines design constraints for the wires that will correct the identified problems. It then initiates a floor planning tool to implement these corrective design constraints in the floor plan design. The PG wire routing optimization tool may alternately or additionally determine design constraints that will minimize the area of the wiring but will avoid creating new IR-drop or electromigration problems. It will then initiate a floor planning tool to implement these optimizing design constraints in the floor plan design.