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CISC vs RISC Processor Architecture
The document discusses the differences between CISC and RISC instruction set architectures. CISC aims to reduce storage usage and support compatibility, while making compilation easier and allowing complex assembly programming. RISC philosophy is to execute one instruction per clock cycle, use fixed-size instructions, only allow load/store instructions to access memory, and support high-level languages. While CISC was originally more common, the conclusion is that RISC provides more design simplicity, better pipelining, and is now preferable given cheaper memory.
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CISC vs RISC Processor Architecture
- 1. CISC vs RISC by: Kaushik Patra (kpatra@gmail.com) a beginner’s reference
- 2. Agenda A quick introduction InstructionSet Architecture (ISA) ISA classification CISC philosophy RISC philosophy Conclusion
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- 4. ISA Instruction Set Architecture. Anagreement between hardware and human for making interaction. Example : ADD R1, R2, R3 Can be represented as : 00101111100001111001010101010101 10111010100011110101001011011010
- 5. ISA Classification Two majorschools of ISA CISC Complex Instruction Set Computer RISC Reduced Instruction Set Computer
- 6. CISC Philosophy Reduce amountof storage used and accessed - reduce load/store. Give support for compatibility. Make compiler’s job easier. Support complex assembly level programming.
- 7. RISC Philosophy Execute oneinstruction per clock. Keep all instructions of same size. Allow only load / store instruction to access the memory. Give support for high level languages (like C, C++, Java).
- 8. Conclusion CISC -> RISC: A paradigm shift Assembly -> C / C++ / JAVA Much more design simplicity with RISC. Ensures better pipelining. Memory is cheaper nowadays So, go for RISC style design.