I don't need an answer. This is not a formal question. If I were to ask a formal question then I should study the POPs and provide details. Instead I am being very vague. I first began reading the POPs in about 1971. In later years I saw that an instruction (actually a set of instructions, correct?) was added to assist with sorting. I never studied it long enough to figure out how to use it. The description of it (them) seemed so vague that it was not intended to be understood. I don't need to know how now; I currently have no use of it. The only use would be to explain to others how powerful the instruction set is.
Is there anyone here that is familiar with that?