RISC and CISC
Complex Instruction Set Computers (CISC)
The major characteristics of CISC architecture
Reduced Instruction Set Computers (RISC)
A computer uses fewer instructions with simple constructs so they can be executed much faster within the CPU without having to use memory as often. It is classified as a reduced instruction set computer (RISC).
The major characteristics of RISC architecture
Other characteristics attributed to RISC architecture
S.N. | RISC | CISC |
1 | Simple instructions taking one cycle | Complex instructions taking multiple cycles |
2 | Only load and store memory references | Any instructions may reference memory |
3 | Heavily pipelined | Not/less pipelined |
4 | Multiple register sets | Single register set |
5 | Complexity is in compiler | Complexity is in micro-programming |
6 | Instructions executed by hardware | Instructions interpreted by microprogramming |
7 | Fixed format instructions | Variable format instructions |
8 | Few instructions and modes | Large instructions and modes |
Overlapped register windows
Berkeley RISC I
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1. What is the difference between RISC and CISC architectures? |
2. Which one is better, RISC or CISC? |
3. Can RISC and CISC architectures coexist in a single system? |
4. Are RISC processors more power-efficient than CISC processors? |
5. Which architecture is more commonly used in modern processors? |
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