1. Adding and Subtracting Integers

• The ADD, INC (Increment), SUB, and DEC (Decrement) instructions have two requirements:

  • If there are two operands, only one operand can be a memory operand.

  • If there are two operands, both must be the same size. For example,

      add ebx, eax      ; Add two registers, result stored in EBX
      add eax, [ebx]    ; Add register and a doubleword in memory
      add [value], 10h  ; Add immediate value to a doubleword