Re: [wwwdocs] [GCC13] Mention Intel __bf16 support in AVX512BF16 intrinsics.

[Hongtao Liu <crazylht@gmail.com>]

On Thu, Nov 3, 2022 at 2:53 PM Kong, Lingling <lingling.kong@intel.com> wrote:
>
> > > > diff --git a/htdocs/gcc-13/changes.html b/htdocs/gcc-13/changes.html
> > > > index 7c6bfa6e..cd0282f1 100644
> > > > --- a/htdocs/gcc-13/changes.html
> > > > +++ b/htdocs/gcc-13/changes.html
> > > > @@ -230,6 +230,8 @@ a work-in-progress.</p>
> > > >    <li>For both C and C++ the <code>__bf16</code> type is supported on
> > > >        x86 systems with SSE2 and above enabled.
> > > >    </li>
> > > > +  <li>Use <code>__bf16</code> type for AVX512BF16 intrinsics.
> > > Could you add more explanations. Like originally it's ..., now it's
> > > ..., and what's the difference when users compile the same source
> > > code(which contains
> > > avx512bf16 intrinsics) with gcc12(and before) and GCC13.
> > > > +  </li>
> > > >  </ul>
> > > >
> > > >  <!-- <h3 id="mips">MIPS</h3> -->
> > > > --
> > > > 2.18.2
> > > >
> > Yes,  changed it. Thanks a lot!
> >
> > Subject: [PATCH] Mention Intel __bf16 support in AVX512BF16 intrinsics.
> >
> > ---
> >  htdocs/gcc-13/changes.html | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/htdocs/gcc-13/changes.html b/htdocs/gcc-13/changes.html index
> > 7c6bfa6e..a35f4fab 100644
> > --- a/htdocs/gcc-13/changes.html
> > +++ b/htdocs/gcc-13/changes.html
> > @@ -230,6 +230,12 @@ a work-in-progress.</p>
> >    <li>For both C and C++ the <code>__bf16</code> type is supported on
> >        x86 systems with SSE2 and above enabled.
> >    </li>
> > +  <li>Use <code>__bf16</code> type for AVX512BF16 intrinsics.
> > + Previously we use  short to represent bf16. Now we introduced
> > <code>__bf16</code> to x86 psABI.
> > +  So we switch intrinsics in AVX512BF16 to the new type <code>__bf16</code>.
> > +  When users compile the same source code contains AVX512BF16
> > + intrinsics with
> > +  GCC13 need to support SSE2, which is different to GCC12 (and before).
> > +  </li>
> >  </ul>
> >
> >  <!-- <h3 id="mips">MIPS</h3> -->
> > --
> > 2.18.2
> >
> > BRs,
> > Lingling
>
> Sorry, modified again. New patch is as below.
Ok, thanks.
>
> htdocs/gcc-13/changes.html | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/htdocs/gcc-13/changes.html b/htdocs/gcc-13/changes.html index 7c6bfa6e..7a5d2ab6 100644
> --- a/htdocs/gcc-13/changes.html
> +++ b/htdocs/gcc-13/changes.html
> @@ -230,6 +230,11 @@ a work-in-progress.</p>
>    <li>For both C and C++ the <code>__bf16</code> type is supported on
>        x86 systems with SSE2 and above enabled.
>    </li>
> +  <li>Use real <code>__bf16</code> type for AVX512BF16 intrinsics.
> + Previously  we use __bfloat16 which is typedef of short. Now we
> + introduced real  <code>__bf16</code> type to x86 psABI. Users need to
> + adjust their  AVX512BF16-related source code when upgrading GCC12 to GCC13.
> +  </li>
>  </ul>
>
>  <!-- <h3 id="mips">MIPS</h3> -->
> --
> 2.18.2
>
> BRs,
> Lingling



-- 
BR,
Hongtao