1. A method, comprising: generating a population of chromosomes, each chromosome including one or more elements that indicate a cluster to which a portion of microcode memory belongs; determining a fitness value of each chromosome; modifying the population of chromosomes based on the fitness values of the chromosomes to generate a new population of chromosomes; and compressing the microcode memory using a cluster-based compression technique, wherein clusters are selected according to a chromosome from the new population with the best fitness.