<<< Simplified Instruction Encoding, Cont. (not x86!)     Index     Simplified Multibyte Instructions (not x86!) >>>

21. Simplified Instruction Encoding Example (not x86!)

  • For example, encoding of instruction 

            mov ax, bx

    consists bit fields

    1. iii=110 is the encoding for MOV REG, REG.

    2. rr=00 specifies that AX is the destination operand.

    3. mmm=001 specifies that BX is the source operand.

  • Simplified opcode structure:

      simplified instruction encoding

<<< Simplified Instruction Encoding, Cont. (not x86!)     Index     Simplified Multibyte Instructions (not x86!) >>>