80x86 Instruction Encoding

• Variable Size 1-byte to 17-bytes

• Jump (JE) 2-bytes

• Push 1-byte

• Add Immediate 5-bytes

• W bit says 32-bits or 8-bits

• D bit indicates direction

  • memory -> reg or reg -> memory
  • movw EBX, [EDI + 45]
  • movw [EDI + 45], EBX

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