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Instruction Set Architecture (ISA) Introduction to ...

CIS 501 (Martin/Roth): Instruction Set Architectures1 CIS 501 Introduction to Computer ArchitectureUnit 2: Instruction Set ArchitectureCIS 501 (Martin/Roth): Instruction Set Architectures2 Instruction Set Architecture (ISA) What is a good ISA? Aspects of ISAs RISC vs. CISC Implementing CISC: ISAA pplicationOSFirmwareCompilerCPUI/OMemory Digital CircuitsGates & TransistorsCIS 501 (Martin/Roth): Instruction Set Architectures3 Readings H+P Chapter 2 Further reading: Appendix C (RISC) and Appendix D (x86) Available from web page Paper The Evolution of RISC Technology at IBM by John Cocke Much of this chapter will be on your own reading Hard to talk about ISA features without knowing what they do We will revisit many of these issues in contextCIS 501 (Martin/Roth): Instruction Set Architectures4 What Is An ISA?

CI 50 (Martin/Roth): Instruction Set Architectures 6 RISC vs CISC Foreshadowing ¥Recall performance equation: ¥(instructions/program) * (cycles/instruction) * (seconds/cycle) ¥CISC (Complex Instruction Set Computing) ¥Improve Òinstructions/programÓ with ÒcomplexÓ instructions ¥Easy for assembly-level programmers, good code density

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  Computing, Instructions, Instruction set, Instruction set computing

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