[Libre-soc-dev] setvl lost its reserved fields (was: setvl gaining CTR mode)

[lkcl]

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On July 3, 2022 10:52:16 AM GMT+01:00, Jacob Lifshay <programmerjake at gmail.com> wrote:
>On Sun, Jul 3, 2022, 02:29 lkcl <luke.leighton at gmail.com> wrote:
>> when i said "it is too late" it means, "it is too late". you should
>have
>raised this (and offered to help) 6 to 24 months ago.
>
>I did, as i mentioned in the last message, which you claim you ignored.
>i
>will copy that part of it again in hopes that you will read it this
>time:
>I wrote (added emphasis):
>> Also, this is effectively changing back to the design *we already
>agreed
>on* iirc (see link below), that had been lost presumably when setvl was
>crammed into the bitmanip major op.
>
>https://bugs.libre-soc.org/show_bug.cgi?id=535
>
>please read the bottom paragraph of this email for an alternative idea
>that
>requires no implementation changes whatsoever, only spec. text
>(assuming
>our implementation was correct in the first place...).
>
>
>third time of repeating, you have not listened the first time and you
>have
>> not listened the second time.
>>
>> i have not read anything that you have written in the past two
>messages.
>
>
>that is a *major* problem, if you don't listen, why should I bother
>trying
>to convey anything? it doesn't help either of us. please do read
>messages.
>I do at least read your messages even if i disagree with their
>contents...
>
>i asked for an opinion on the minor incremental change to add CTR mode.
>>
>
>what i requested in the last message is a even more minor change than
>your
>adding ctr mode....all that is happening is a constant-0 bit is
>renamed. no
>changes to assembly syntax, what each bit of the instruction encoding
>currently does, unit tests, etc.
>
>alternatively:
>
>If you don't like renaming fields at all, then we can do what is 100%
>equivalent (except in clarity) -- state that all values of SVi with the
>msb
>set must trap and are reserved for future extensions (with a
>*non-normative* note explaining what could be done -- non-normative
>meaning
>it explains what the idea is, but it isn't a part of the official
>standard
>that imposes any requirements).
>
>Jacob