AntoinePrv commented on issue #48764:
URL: https://github.com/apache/arrow/issues/48764#issuecomment-3724109383

   @kou right now we support both, but new PRs such as GH-48765 backport some 
performance improvements that were merged in xsimd. Future work may also 
backport some more code. On top of this, GH-45331 may require us to add some 
CPU detection feature to xsimd, which won't be much use if we cannot use them.
   
   xsimd being a private header only dependency, there is not much to to be 
gained from using the system one.


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