davemgreen wrote:

> These instructions are being used in the hand-written assembly for a 
> hypervisor. The hypervisor will check at runtime if the instructions are 
> available on the current CPU before calling this code.

We try to coordinate between GCC and LLVM, to make sure we implement the same 
interface. Is there a reason you can't use `-march=armv8.7-a` as it works 
today, or add a `.arch armv8.7-a` directive? Otherwise we will need to check 
with GCC to make sure they are happy to implement the same features.

https://github.com/llvm/llvm-project/pull/116707
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