13. The NEG Instruction

• The NEG instruction negates a value by finding 2's complement of its single operand.

• This simply means multiply operand by -1.

• When a positive value is negated the result is negative.

• A negative value will become positive.

• Zero remains zero.

• For example,

          mov   al, -1   ; Load register
          neg   al       ; AL now has 1