Negation of negative operand with inc/dec added in certain cases. Don't know effect for sure, author has left. Added rcsid.
Negation of negative operand with inc/dec added in certain cases.
Don't know effect for sure, author has left.
Added rcsid.

Godzil/ack,Godzil/ack,Godzil/ack,Godzil/ack,Godzil/ack