[RFC] RISC-V: Support Zvabd extension instructions.

[Jan Beulich]

On 19.08.2025 03:39, Jiawei wrote:
> 在 2025/8/18 20:16, Jan Beulich 写道:
>> On 18.08.2025 13:29, Jiawei wrote:
>>> This patch supports Zvabd extension instructions:
>>> https://github.com/riscv/integer-vector-absolute-difference
>> Where in that repo, which looks to simply be a clone that's behind its origin,
>> is this new extension documented? For example, there's no src/Zvabd.adoc.
> 
> The total extension information can get form
> 
> https://lf-riscv.atlassian.net/browse/RVS-3896

Now that I got around to looking at it - I can't find the relevant spec text
there either. Can you please provide a proper link to the documentation of
this extension? That is, to just that doc, not any bigger container thereof?
For example, from the new testcase in the patch I am to conclude that
"<insn> ..., v0.t" forms aren't supported. The encoding, otoh, suggests they
are, but examples thereof are merely missing from the testcase.

Jan