Difference Between Complex Instruction Set Computer (CISC) and Reduced Instruction Set Computer (RISC) In Tabular Form
| Sno. | Complex Instruction Set Computer (CISC) | Reduced Instruction Set Computer (RISC) |
| 1. | CISC Instructions with variable formats. | RISC Instruction with fixed format and almost register based Instruction. |
| 2. | No. of Instructions 120 to 350. | No. of Instructions less than 100. |
| 3. | CPU control mostly hardwired without control memory. | Mostly microcoded using control memory but modern CISC also uses hardwired control. |
| 4. | Large set of instructions with variable formats(16-64 bits per instruction). | Small set of instructions with fixed (32-bit) format and most register-based instructions. |
| 5. | 8-24 GPRs(General Purpose Resisters), mostly with a unified cache for instructions and data, recent designs also use split caches. | Large numbers (32 – 192) ot GPRs(General Purpose Registers) with mostly split datd cache and instruction cache. |
| 6. | Not register based instructions | Register based instructions |
| 7. | More memory access | Less memory access |
| 8. | Emphasis on hardware | Emhasis on software |
| 9. | Includes multi-clock | Single-clock |
| 10. | Complex Instructions In CISC | Reduced instruction In RISC |
| 11. | Memory-to-memory | Register to register |
| 12. | “LOAD” and “STORE” incorporated in instructions | “LOAD”and “STORE” are indipendent instructions |
| 13. | Small code sizes | Large code sizes |
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