On Thu, Sep 23, 2021 at 6:38 PM Hongtao Liu <crazy...@gmail.com> wrote:
>
> On Fri, Sep 24, 2021 at 9:20 AM H.J. Lu <hjl.to...@gmail.com> wrote:
> >
> > On Thu, Sep 23, 2021 at 6:17 PM liuhongt <hongtao....@intel.com> wrote:
> > >
> > > Updated, mention _Float16 support.
> > >
> > > ---
> > > htdocs/gcc-12/changes.html | 13 ++++++++++++-
> > > 1 file changed, 12 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html
> > > index 81f62fe3..f19c6718 100644
> > > --- a/htdocs/gcc-12/changes.html
> > > +++ b/htdocs/gcc-12/changes.html
> > > @@ -165,7 +165,18 @@ a work-in-progress.</p>
> > > </li>
> > > </ul>
> > >
> > > -<!-- <h3 id="x86">IA-32/x86-64</h3> -->
> > > +<h3 id="x86">IA-32/x86-64</h3>
> > > +<ul>
> > > + <li>New ISA extension support for Intel AVX512-FP16 was added to GCC.
> > > + AVX512FP16 intrinsics are available via the
> > > <code>-mavx512fp16</code>
> > > + compiler switch.
> > > + </li>
> > > + <li>For both C and C++, The <code>_Float16</code> type is supported on
> > > + x86 systems with SSE2 enabled. Without <code>{-mavx512fp16}</code>,
> > > + <code>_Float16</code> type is storage only, all operations will be
> >
> > I don't think _Float16 is storage only without AVX512FP16.
> >
> I guess you're meaning that psABI is available for _Float16 even w/o
> AVX512-FP16.
>
> How about
>
> + <li>For both C and C++, The <code>_Float16</code> type is supported on
> + x86 systems with SSE2 enabled. Without <code>{-mavx512fp16}</code>,
> + no real AVX512-FP16 instructions are generated, all operations will be
No need for "no real AVX512-FP16 instructions are generated".
> + emulated by software emulation and the <code>float</code> instructions.
> + </li>
>
> > > + emulated by software emulation and the <code>float</code>
> > > instructions.
> > > + </li>
> > > +</ul>
> > >
> > > <!-- <h3 id="mips">MIPS</h3> -->
> > >
> > > --
> > > 2.18.1
> > >
> >
> >
> > --
> > H.J.
>
>
>
> --
> BR,
> Hongtao
--
H.J.
