> 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

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