wangpc-pp wrote:

> > I am kind of confused now. So the situation here is that RVIOS has already 
> > implemented these vendor extensions in cores and RVIOS is also trying to 
> > make these extensions official RVI standards, right?
> 
> You're confusing two things. We (Rivos) have defined a set of custom vendor 
> extensions - this patch is the first in that sub-series. We are _also and 
> separately_ proposing a subset of instructions for consideration at RVI for 
> eventual standardization. As an example of how these are different, see 
> XRivosVisni in the linked repo. That's a vendor extension which relates to 
> gaps identified in RVV, but for which we're not currently proposing an 
> extension at RVI.

Thanks, I'd like to know if these vendor extensions have been implemented in 
some type-out-ed cores. I have this question because I saw that these vendor 
extensions are of version 0.1. If they are going to be changeable (and 
experimental), then why are we supporting XRivosVizip extension in a hurry 
since XRivosVizip and Zvzip are overlapped.

https://github.com/llvm/llvm-project/pull/127694
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