Explain about RISC architecture, Computer Engineering

Q. Explain about RISC ARCHITECTURE?

Let's first list some significant considerations of RISC architecture:

1. RISC functions are kept simple unless there is a very good reason to do otherwise. A new operation which increases execution time of an instruction by 10 per cent can be added only if it decreases size of the code by at least 10 per cent. Even greater reductions might be necessary if the extra modification requires a change in design.

2. Micro-instructions stored in CU cannot be faster than simple instructions because the cache is built from same technology as writable control unit store, a simple instruction can be executed at same speed as that of a micro-instruction.

3. Microcode is not magic. Moving software into microcode doesn't make it better; it only makes it harder to change. Runtime library of RISC has all characteristics of functions in microcode, except that it's easier to change.

4. Simple decoding and pipelined execution are more significant than program size. Pipelined execution gives a peak performance of one instruction each step. The longest step determines the performance rate of pipelined machine so ideally every pipeline step must take same amount of time. 

5. Compiler must simplify instructions instead of generate complex instructions. RISC compilers try to eliminate as much work as possible at the time of compile time so that simple instructions can be used. For illustration RISC compilers attempt to keep operands in registers so that simple register-to-register instructions can be used. RISC compilers keep operands which will be reused in registers instead of repeating a memory access or a calculation. They consequently use LOADs and STOREs to access memory so that operands aren't implicitly discarded after being fetched.

Posted Date: 7/30/2013 5:33:18 AM | Location : United States







Related Discussions:- Explain about RISC architecture, Assignment Help, Ask Question on Explain about RISC architecture, Get Answer, Expert's Help, Explain about RISC architecture Discussions

Write discussion on Explain about RISC architecture
Your posts are moderated
Related Questions

What is the need of MODEM in data communication? Need of Modem: Modems are utilized to interface computer networks, computers and other terminal equipment for radio channels

Explain about the two services that are used to deal with communication. Message Service: Used by the application servers to change short internal messages, all system commu

What is Race condition? Race condition: The circumstances where several processes access - and manipulate shared data-concurrently. The last value of the shared data depends

Yes. In either the system-wide gimprc file or your personal gimprc file, uncomment the line that have install-colormap.


Arbitrary categorisation - learning decision trees: Through visualising  a set of boxes with some balls in. There if all the balls were in a single box so this would be nicely

What are the different parameter passing mechanisms to a function? The different parameter-passing mechanisms are given below: 1.   Call by value 2.   Call by value-resu

What is meant by Questionnaires This includes sending out questionnaires to the work force or/and to customers to find out their views of existing system and to find out how.

This is an applied unit that shows you how to assess interactive products against a selection of usability and user experience goals. It also introduces a selection of design princ