There was a link here but then I did take it away.
An Arithmetic Logic Unit (ALU) is one of the main subcomponents of a microprocessor. If you can evolve that using a genetic algorithm, then evolving the other subcomponents should also be possible. Eh, microprocessors designing microprocessors with minimal human intervention. Actually humans must design microprocessors using subcomponents in order to understand and organize what is going on.
An evolutionary system can take a more integrated approach where everything is fitted together without the conceptual need for factoring the problem into subcomponents. Undoubtedly this would yield a much more efficient design.