INSTRUCTION SET ARCHITECTURES Early trend was to add more and more instructions to new CPus to do elaborate operations VAX architecture had an instruction to multiply polynomials! RISC philosophy (Cocke IBM, Patterson, Hennessy, 1980s) Reduced Instruction Set Computing Keep the instruction set small and simple, makes it easier to build fast hardware Let software do complicated operations by composing simpler ones▪Early trend was to add more and more instructions to new CPUs to do elaborate operations ▪ VAX architecture had an instruction to multiply polynomials! ▪RISC philosophy (Cocke IBM, Patterson, Hennessy, 1980s) – Reduced Instruction Set Computing ▪ Keep the instruction set small and simple, makes it easier to build fast hardware. ▪ Let software do complicated operations by composing simpler ones. 5