Which processor is better RISC or CISC Why?
Table of Contents
Which processor is better RISC or CISC Why?
The short answer is that RISC is perceived by many as an improvement over CISC. CISC machines can have special instructions as well as instructions that take more than one cycle to execute. This means that the same instruction executed on a CISC architecture might take several instructions to execute on a RISC machine.
Why is CISC hard to pipeline?
A CISC computer might well write two registers in one instruction, making it hard to pipeline if the register file has only one write port. Lets use simple logic to understand this. Assumptions : RISC instruction are mostly 1/2 cycle instruction whereas CISC instructions are multi-cycle.
What are the main differences between RISC and CISC when is it ideal to use RISC and CISC?
These are simple instructions which are generally executed in one clock cycle. RISC chips are relatively simple to design and inexpensive….Difference between RISC and CISC processor | Set 2.
| CISC | RISC |
|---|---|
| A large number of instructions are present in the architecture. | Very fewer instructions are present. The number of instructions are generally less than 100. |
What are the advantages of RISC over CISC?
RISC vs. CISC
| RISC | CISC |
|---|---|
| RISC has large code sizes, which means it operates low cycles per second | CISC has small code sizes, high cycles per second |
| Spends more transistors on memory registers | The transistors in a CISC processor are used to store complex instructions |
| Less memory access | More memory access |
Is RISC faster than CISC?
The performance of RISC processors is often two to four times than that of CISC processors because of simplified instruction set. This architecture uses less chip space due to reduced instruction set. RISC processors can be designed more quickly than CISC processors due to its simple architecture.
What is primary difference between a RISC and CISC processor?
Difference between the RISC and CISC Processors
| RISC | CISC |
|---|---|
| It is a Reduced Instruction Set Computer. | It is a Complex Instruction Set Computer. |
| It emphasizes on software to optimize the instruction set. | It emphasizes on hardware to optimize the instruction set. |
Why is RISC easier to pipeline?
Because RISC instructions are simpler than those used in pre-RISC processors (now called CISC, or Complex Instruction Set Computer), they are more conducive to pipelining. While CISC instructions varied in length, RISC instructions are all the same length and can be fetched in a single operation.
Why CISC is faster than RISC?
In common CISC chips are relatively slow (compared to RISC chips) per instruction, but use little (less than RISC) instructions. An other advantage of RISC is that – in theory – because of the more simple instructions, RISC chips require fewer transistors, which makes them easier to design and cheaper to produce.
What is CISC and RISC in computer architecture?
RISC stands for ‘Reduced Instruction Set Computer Whereas, CISC stands for Complex Instruction Set Computer. The RISC processors have a smaller set of instructions with few addressing nodes. The CISC processors have a larger set of instructions with many addressing nodes.
What are the advantages and disadvantages of RISC and CISC?
The performance of RISC processors is often two to four times than that of CISC processors because of simplified instruction set. This architecture uses less chip space due to reduced instruction set. This makes to place extra functions like floating point arithmetic units or memory management units on the same chip.