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https://issues.apache.org/jira/browse/ARROW-6436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16932321#comment-16932321
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Antoine Pitrou commented on ARROW-6436:
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As for built-in float16 types it looks a bit more complicated, e.g. clang:
{quote}Clang supports two half-precision (16-bit) floating point types:
{{__fp16}} and {{_Float16}}. These types are supported in all language modes.
{{__fp16}} is supported on every target, as it is purely a storage format; see
below. {{_Float16}} is currently only supported on the following targets, with
further targets pending ABI standardization:
* 32-bit ARM
* 64-bit ARM (AArch64)
* SPIR
{quote}
> [C++] vendor a half precision floating point library
> ----------------------------------------------------
>
> Key: ARROW-6436
> URL: https://issues.apache.org/jira/browse/ARROW-6436
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Benjamin Kietzman
> Priority: Major
> Fix For: 1.0.0
>
>
> Clang and GCC provide _Float16 and there are numerous polyfills which can
> emulate a 16 bit float for other platforms. This would fill a hole in the
> kernels and other code which don't currently support HALF_FLOAT.
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