[Libre-soc-isa] [Bug 969] 64-bit variants of setvl, svshape, svstep and svindex

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Tue Oct 25 02:53:31 BST 2022


Jacob Lifshay <programmerjake at gmail.com> changed:

           What    |Removed                     |Added
                 CC|                            |programmerjake at gmail.com

--- Comment #1 from Jacob Lifshay <programmerjake at gmail.com> ---
please have bits that are specifically reserved for enabling future regfile
extensions, last time setvl had that but you ended up using it for something
else, i was eventually ok with that because i figured we could cram those
extension bits in the prefix of sv.setvl

if you can reserve 3 bits at minimum, preferably 5-8 bits, that should be good.
we'd need 3 bits for a mode and the rest for immediate extension to support
larger VL/MAXVL.

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