Table of contents
1.The meaning of CISC and RISC
CISC
Complex Instruction Set Computer, (CISC: Complex Instruction Set Computer) CISC for short
RISK
RISC: Reduced Instruction Set Computer is a computer with shorter instruction length and runs faster than CISC
2. Difference comparison
| Command system structure class type |
instruction | Addressing mode | Method to realize | other |
|---|---|---|---|---|
| CISC(complex) | A large number and a large difference in frequency of use Variable length format |
Support multiple | Microprogram control technology Technology (microcode) |
Long development cycle |
| RISK(streamline) | The number is small, the frequency of use is close to the fixed-length format, most of them are single-cycle instructions , operating registers, only Load/Store operations Memory |
Few support methods | Added general-purpose registers; hard wiring Logic control mainly Suitable for pipelines |
Optimized compilation, effectively supports high-level languages |
3.Examples
Example one:
Analysis:Select B There are not many addressing methods, which is a characteristic of CISC.