dcandler wrote:

> It looks like all C1 series enabled SME and MOPS unconditionally. But 
> according to Arm, only C1-Ultra/Premium are forced with SME support, and MOPS 
> may cause performance degradation.

My understanding is that the convention of the `-mcpu` option is to enable all 
optional and mandatory features. The C1-Nano and Pro can be configured with 
SME, so the compiler should be able to support it, while MOPS is mandatory from 
v8.8.

https://github.com/llvm/llvm-project/pull/171124
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