CISC and RISC .. Which one has different register size? and why

@q8ysurgeon-ZgzZLz • Oct 27, 2024

Oct 27, 2024

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CISC and RISC .. Which one has different register size? and why

Reduced Instruction Set Computer

and

Complex Instruction Set Computer

which one has different register size ? and why

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shalini_goel14

@shalini-goel14-ASmC2J • Mar 6, 2009

As far as I remember my Computer Architecture subject.

In CISC computers size of registers vary.

RISC have general purpose registers. All of same sizes.
CISC have different size registers because register sets consist of both Data registers and address registers. So size of both kind of regsiters vary based on computer architecture.

Please correct me if I have imparted any wrong information. 😀

@q8surgeon I guess you are more fresh to these topics so can you put some more light on both these topics here if you have enough time to do so. 😀

Thanks
Happy to help
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Yamini L

@yamini-uMEVDQ • Mar 6, 2009

I hope RISC has got more registers..As register access is faster than memory access, it is logical to have as many registers as possible and still be efficient. Register memory is the fastest memory but it is also the most costly and therefore there are cost limitations..
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Predictor

@predictor-lfVrRm • Mar 14, 2009

miniy
I hope RISC has got more registers..As register access is faster than memory access, it is logical to have as many registers as possible and still be efficient. Register memory is the fastest memory but it is also the most costly and therefore there are cost limitations..
I think they typically do. The old AMD 29000 RISC processor had 192 general-purpose registers, each 32-bits wide.

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