Question

Difference between MUL and IMUL

Answer 1

Answer:

mul is used for unsigned multiplication whereas imul is used for signed multiplication. Algorithm for both are same, which is as follows: when operand is a byte: AX = AL * operand

Answer 2

The MUL multiplies the 'unsigned numbers'. IMUL multiplies 'signed numbers'.

Explanation:

• The MUL and IMUL are multiplication instructions. Here, MUL instructions used for multiplying unsigned numbers. On the other hand, IMUL multiplies signed numbers.

• For these instructions, one factor should be in the accumulator register. The other factor can be in any of the memory operand or single register.

• The IMUL instruction with multiple operands can be used for both signed – unsigned multiplication. This is because, the 16 bit product will be same in both case.

To know more about multiplication instructions,

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2) State the flag affected by IMUL instruction

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