well first of all, correct me if I'm wrong, but isn't that exactly the same like pranav's routine?
and second. if your first number on P0 is
i.e. 0101, and the second one is 1010
the result wil be:
P1: 0010 0000
P2: 0000 0100
whereas P1 should be 0000 0000

again, the same mistake pranav made in his first version.

Bart