[Libre-soc-dev] svp64

Luke Kenneth Casson Leighton lkcl at lkcl.net
Thu Dec 24 14:56:28 GMT 2020

crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

On Thu, Dec 24, 2020 at 2:35 PM Hendrik Boom <hendrik at topoi.pooq.com> wrote:
> On Thu, Dec 24, 2020 at 01:59:58PM +0000, Luke Kenneth Casson Leighton wrote:
> > https://libre-soc.org/openpower/sv/overview/
> >
> > i started this "overview" page to give an introduction as well as keep the
> > svp64 page "clean" if you know what i mean.
> >
> > it is also a rewrite of what was formerly the RV appendix page, to sone
> > extent.
> In section 3. Adding single predication
> It's not clear to me what the use case is of stopping the loop early when the
> predication bit is zero and the destination is a scalar.

not all bits of the predicate will be zero: if they are, the operation is a NOP.

when (at least) one bit of the predicate is non-zero, this is what's
termed a "VSELECT" operation.

must remember to add that.


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