1. A method for specifying a set of instructions selectable for generation by an instruction generator, comprising: identifying a first class name representative of a first class of instructions, said first class of instructions being a subset of an instruction set of a processor; concatenating said first class name with a unique identifier label thereby defining a unique singleton meta-mnemonic representative of a first set of instructions, said first set of instructions being a subset of said instruction set of said processor; and specifying, via said singleton meta-mnemonic, said first set of instructions for selection by said instruction generator; whereby said singleton meta-mnemonic specifies a set of instructions that are a subset of said processor instruction set and are available for selection and generation by said instruction generator.