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

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

bkietz commented on issue #22806:
URL: https://github.com/apache/arrow/issues/22806#issuecomment-1513370288

   I think if available software implementations are unsatisfactory, it'd be preferable to write a very minimal version of our own and handle any operations by first converting to 32 bit float. This should be sufficient since we'd be able to use a native type most of the time. In that case, we'd only need to maintain:
   - The cmake logic/flags necessary to enable native IEEE 754-2008 half precision floats when available
   - The conversions `soft 16 bit float <=> 32 bit float`
     - Including bitwise equivalence to native 16 bit floats when available


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