Re: [PATCH] Add optional __Bfloat16 support

[H.J. Lu via Gcc-patches]

On Fri, Jun 10, 2022 at 2:38 AM Florian Weimer <fwei...@redhat.com> wrote:
>
> * liuhongt via Libc-alpha:
>
> > +\subsubsection{Special Types}
> > +
> > +The \code{__Bfloat16} type uses a 8-bit exponent and 7-bit mantissa.
> > +It is used for \code{BF16} related intrinsics, it cannot be

Please mention that this is an alternate encoding format for 16-bit floating
point.  It has the same size and alignment as _Float16.

> > +used with standard C operators.
>
> I think it's not necessary to specify whether the type supports certain
> C operators (surely assignment will work?).  If they are added later,
> the ABI won't need changing.
>

If _Bfloat16 becomes a fundamental type, the ABI should be changed to
move it together with other scalar types.

-- 
H.J.