[Libre-soc-dev] MVL unclear

[Luke Kenneth Casson Leighton]

On Fri, May 21, 2021 at 3:11 PM Lauri Kasanen <cand at gmx.com> wrote:

> On Fri, 21 May 2021 14:17:17 +0100
> Luke Kenneth Casson Leighton <lkcl at lkcl.net> wrote:
>
> So the answer was yes afterall. It is only a loop optimization.
>

oh - yes, setvl inside the loop.  so yes, absolutely critically essential
to be
less instructions, particularly if one of those is a branch.

> architectures where the register file is further expanded. There should be
> some reserved must-currently-trap-if-set bits in setvl's encoding for that
> purpose.

yes.