bug#68871: Can't use od to print half-precision floats

[Pádraig Brady]

On 01/02/2024 19:16, Paul Eggert wrote:
> Oh, and another thought: suppose someone wants to use od on bfloat16_t
> values? They're popular in machine learning applications, and likely
> will be more popular than float16_t overall. See:
>
> https://sourceware.org/pipermail/libc-alpha/2024-February/154382.html

True. I suppose we would select between these like:

 -t f2, -t fh = IEEE half precision
        -t fb = brain floating point

bfloat16 looks like a truncated single precision IEEE,
so we should be able to just pad the extra 16 bits with zeros
when converting to single precision internally for processing.

cheers,
Pádraig