RISC vs CISC System

RISC (Reduced Instruction Set Computer)

1. It stands for Reduced instruction set computer.

2. Few number of instruction.

3. Few addressing modes.

4. Fixed length instruction,easily decoded.

5. Complexity in compiler.

6. Only LOAD/STORE instruction access memory.

7. All operation are done within the register by CPU.

8. Single cycle instruction execution.

9. Hardwired control rather than micro-programmed control.

Example:- Power Pc

CISC (Complex Instruction Set Computer)

1. It stands for Complex instruction set computer.

2. Large number of instruction.

3. Large variety of addressing modes.

4. Variable length instruction.

5. Complexity in microcode.

6. Many instructions can access memory.

7. Instruction that manipulate operands iin memory.

8. Variable length instruction format.

9. Micro-programmed control rather than hardwired control.

Example:- Pentium PC