Description

The MUL instruction performs unsigned multiplication. Its actions depend on the size of its operand, as follows:

• A byte operand is multiplied by the AL value; the result is left in the AX register. The CF and OF flags are cleared if the AH value is 0; otherwise, they are set.

• A word operand is multiplied by the AX value; the result is left in the DX:AX register pair. The DX register contains the high-order 16-bits of the product. The CF and OF flags are cleared if the DX value is 0; otherwise, they are set.

• A doubleword operand is multiplied by the EAX value and the result is left in the EDX:EAX register. The EDX register contains the high-order 32-bits of the product. The CF and OF flags are cleared if the EDX value is 0; otherwise, they are set.