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
+ 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
