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Encoding computer instruction

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• Computer instruction consists of 3 parts:
  • Operation (e.g., Add, Subtract, Compare, etc)
  • Source operands (depends on operation)
  • Destination (depends on operation)

• Types of computer instructions
  • Binary operation: takes 2 operands and produce 1 output - example: Add
  • Unary operation: takes 1 operands and produce 1 output - example: Negate
  • Some operation does not take any operands - example: HALT

• Each computer has its own instruction code... so we have to be very general in this discussion...