An example Analysis of mul Multiplication Operation

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Product of multiplicators

Al 8-bit Operand ax

Ax 16-bit Operand dx:ax

Eax 32-bit Operand edx:eax

Because if our multiplier is an 8-bit Operand, our result exists in the ax register. If it is a 16-bit Operand, our results are stored in dx:ax. If dx is not 0, the carry flag is set.

After executing the mul instruction, we usually check the carry flag. Because we need to know whether the upper half of the product can be safely ignored.

For example:

Mov al, 6h

Mov bl, 10h

Mul bl

Now we check the carry flag cf = 0, then ah we can ignore it, so the result is 60h.

So let's give you another example:

For example:

Mov ax, 6000

Mov bx, 5000

Mul bx

Let's check the carry flag and cf = 1 at this time. So our result is dx:ax, and then our dx = 1E00, ax = 0000, so in the end our product is 1E000000.

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