[GitHub] [arrow] pitrou commented on issue #22806: [C++] vendor a half precision floating point library

["pitrou (via GitHub)" <gi...@apache.org>]

pitrou commented on issue #22806:
URL: https://github.com/apache/arrow/issues/22806#issuecomment-1511196001

   > Half [seems pretty complete](https://half.sourceforge.net/namespacehalf__float.html) so I think it or [FP16](https://github.com/Maratyszcza/FP16) would make good candidates.
   
   Both look rather unmaintained. We could decide to maintain a fork in the source tree, but this would need assessing their technical quality as well.
   
   Something as simple as https://github.com/Maratyszcza/FP16/blob/0a92994d729ff76a58f692d3028ca1b64b145d91/include/fp16/bitcasts.h#L30-L34 is undefined behaviour:
   > It is undefined behavior to read from the member of the union that wasn't most recently written.
   
   (from https://en.cppreference.com/w/cpp/language/union)
   


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