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  • Computer Organization and Architecture Instruction Set Design
    Fixed and Variable Length Instructions • Fixed length instructions can provide compactness and efficiency at the cost of flexibility (PDP-8) or can utilize space inefficiently (PDP-10) • Variable length instructions can provide variety and flexibility in a compact format • Cost occurs in processor complexity
  • Instruction Set Design - University of California, San Diego
    How complex should the addressing modes be? What are the trade-offs? How widely applicable are they? How much do they impact the complexity of the machine? How many extra bits do they require to encode? Which Operations? Does it make sense to have more complex instructions? -e g , square root, mult-add, matrix multiply, cross product
  • Evolution of Instruction Sets - University of Pittsburgh
    • Fixed instruction length is easier to decode and faster to execute • May use variable length op-code (why ?) • How do you specify the addressing mode?
  • Instruction Sets: Characteristics and Functions Addressing Modes
    What is an Instruction Set? How many ops? What can they do? How complex are they? Which operations can be performed on which registers? General purpose and specific registers
  • Lecture 4: Instruction Set Design Pipelining - University of Utah
    Instruction Set Encoding • Operations are easy to encode efficiently – the key issues are the number of operands and their addressing modes • Few addressing modes low complexity in decoding and pipelining, but greater code size • Fixed instruction lengths low complexity in decoding, but greater code size
  • Chapter 11 Instruction Sets: Addressing Modes and Formats
    Instruction Length • Affected by and affects: —Memory size —Memory organization —Bus structure —CPU complexity —CPU speed • Trade off between powerful instruction repertoire and saving space
  • Chapter 5
    instruction set architecture design •Gain familiarity with memory addressing modes •Understand the concepts of instruction-level pipelining and its affect upon execution performance





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