[Libre-soc-dev] pysvp64asm: opcode setvli not supported

[Luke Kenneth Casson Leighton]

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


On Thu, Jun 17, 2021 at 6:15 AM Lauri Kasanen <cand at gmx.com> wrote:

> > > fnmsubs is -(RA*RB-RC) something like that
>
> ^ That still has a negation. You may get lucky and an even amount
> cancels out, but that's fragile as hell.
>

well, irony is: we can't use it anyway.  the accuracy of fmac is so high
it is causing the output to be wrong!

fmul --- multiply and ROUND
fadd --- add and ROUND

vs

fmadd - multiply and add THEN round

i worked out last night how to use map-reduce mode without having
to use a predicate mask.  will do that now.

l.