[clang] [llvm] [RISCV] Add MC layer support for XSfmm*. (PR #133031)

[Craig Topper via llvm-commits]

topperc wrote:

> > > but won't merge them until they are ratified just like Zvzip/Zvabd/Zibimm
> > 
> > 
> > I think this patch is supported to be the vendor instruction set of `SiFive Xsfmm* Attached Matrix Extensions` if I understand correctly of this PR.
> > AME is another issue that we don’t have ratified AME but just SiFive AME proposal, XuanTie AME proposal.
> 
> SiFive's AME proposal locates in OP-V/OP-VE category, I think it is not designed as vendor extension. IIUC, this patch is just for early evaluation.

SiFive is committed to maintaining this implementation and we would very much like to see it in tree to easier sharing. Expect to see patches for intrinsics in the near future.

https://github.com/llvm/llvm-project/pull/133031