https://github.com/lenary commented:

Please can you add a LLVM IR test for `llc`?

I don't think I know enough about the "fixed vectors in scalable vectors" 
lowering to know if `splitValueIntoRegisterParts` and 
`joinRegisterPartsIntoValue` are correct but they don't seem so wrong at a 
glance. I might have expected to see a call to `convertFromScalableVector` (as 
join and split tend to be symmetric) but I see there's a `getExtractSubvector` 
already.

https://github.com/llvm/llvm-project/pull/150724
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