[Libre-soc-isa] [Bug 535] setvl/setvli encoding & future reg file expansion

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=535

--- Comment #10 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #8)

>     setvli VL=MVL=5
>     v.mv ra, rb # copy 5 regs

there's a whole stack of usecases like this, and it was deemed sufficiently
valuable and useful for RT=0 to have made it into RVV.

likewise RA=0 was deemed valuable and useful (see wiki.page with link to online
RVV setvl)

what they couldn't think of a use for is RA=0,RT=0 however in our case this can
be used to set MVL or VL.

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