[libc-commits] [libc] [libc] add cpu feature flags for SVE/SVE2/MOPS (PR #166884)

[Schrodinger ZHU Yifan via libc-commits]

SchrodingerZhu wrote:

> Just for reference, Arm's latest C1 series CPUs support MOPS, but according to Arm's [Software Developer Errata Notice](https://developer.arm.com/documentation/111077/8-0/?lang=en), MOPS might cause performance degradation. may need dispatch like FSRM.
> 
> 
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> > 4043997
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>  FEAT_MOPS instructions might cause performance degradation


Got it. Thank you for the info!

Currently it is really just a feature flag. When we are going to use it, we could either look for ways to dispatch it or just leave it as a config flag.



https://github.com/llvm/llvm-project/pull/166884