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Difference between CISC and RISC

Difference between CISC and RISC

In this tutorial, we are going to see the major difference between CISC vs RISC computers.

 

CISC stands for Complex Instruction Set Computer

RISC stands for Reduced Instruction Set Computer

Given below are the major differences:

CISC

RISC

Clock per instruction (CPI) lies between 1 and 15

Clock per instruction (CPI) lies between 1 and 2

It consists mostly micro-programmed control units

It consists mostly hardwired control units

Most of the instruction in CISC is manipulated in memory

All operation of RISC is executed within registers of the CPU

A large number of instruction types are used, 100-250 instructions

Relatively few number of instruction types are used, typically less than 100

A large number of addressing modes are used (5-15 addressing modes)

Relatively fewer addressing modes are used in RISC (less than 6)

CISC has variable length instruction formats

RISC has fixed length instructions formats

Small number of general-purpose registers are used in CISC

Large number of general-purpose registers are used in RISC

 


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