roee88 edited a comment on pull request #324:
URL: https://github.com/apache/arrow-rs/pull/324#issuecomment-846508588


   Sure. Though I don't think that the link you shared actually affects it. 
Originally there was no feature flag for simd and it was always enabled for x86 
and x86_64. Then, a feature flag was added on top to allow disabling simd, it 
was then set to disabled by default, then cfg_aliases  was used (no 
functionality change), and finally aarch64 was added to the list of 
architectures. 
   
   So I might be wrong but it all seems to be for historic reasons. However, 
this applies only as long as it's disabled by default. If at some point it will 
change to enable by default it would need to be enabled by default only for 
known supported architectures and disabled by default otherwise. Is that 
something that's possible to implement easily?


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