labrinea wrote:

> I wonder if we can get any cases of using asm msr in function version for 
> features in question? Anyway LGTM to be aligned with specification.

Dit was the only FMV feature with a corresponding PSTATE value which could be 
dirrectly used with MRS/MSR-immediate. The rest of the features have 
corresponding bits in FPCR and SCTLR_ELx. Those registers can be accessed in 
the absence of rpres, ebf16, and memtag3, that's why we don't have a Subtarget 
feature for them in the LLVM backend.

https://github.com/llvm/llvm-project/pull/114387
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