Then we enter the last section of this chapter, CISC and RISC.
Let's take a look back, we have an overview of this chapter. We have put before addressing instruction format and instructions are finished, the two parts of it are a focus of this chapter. And this part of the chapter, CISC and RISC part, as long as we can slightly understand the details of what we will be content for some specific concepts are explained in detail in the next chapter, Chapter V CPU them. So where do we just make some general understanding, there are some general impression, and its concept have some knowledge of it. For its concrete details we do not have to do a lot of in-depth understanding.
We look at, what is CISC, RISC what is it? We, ah, it will be a move in two opposite directions in the development of the whole system of instruction, they are diametrically opposed. The former does CISC, one of its full name, is a Complex Instruction Set Computer, then Complex What does it mean? It is complicated. So it is called CISC complex instruction set computer. RISC then, um, R What does it mean? Reduced, Reduced Instruction Set Computer, that is to say it is a reduced instruction set, such as a computer. Is a complex, it is a streamlined, do not confuse the two. Note that this C and R are not confused, I can not remember backwards. So what is it CISC, that is to say, with the words of a popular, which means that an instruction to complete the basic functions of a complex.