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30. Problem with Extending the Simplified Instruction Set (not x86!)

  • Unfortunately, the simplified CPU doesn't have that many illegal opcodes available.

  • For example, to add new single-operand instructions 

        SHL - shift left
    SHR - shift right
    ROL - rotate left
    ROR - rotate right

  • Imaginary single-operand instruction encoding:

      single operand instruction encoding

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