> Do you mean a v8qi->v8hi widening subtract or a v16qi->v8hi widening > subtract?
I mean the latter, that seemed to be what richi was suggesting previously. > The problem with the latter is that we need to fill the > extra unused elements with something and remove them later. That's fair enough, fake/don't care elements is a bit of a hack. I'll try something out with the conversions and regular subtract. thanks for the help, Joel