From: "H.J. Lu" <hjl.tools@gmail.com>
To: Hongtao Liu <crazylht@gmail.com>
Cc: liuhongt <hongtao.liu@intel.com>, GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] [GCC12] Mention Intel AVX512-FP16 and _Float16 support.
Date: Thu, 23 Sep 2021 19:12:23 -0700 [thread overview]
Message-ID: <CAMe9rOrK9T9sGPq-Z7+v0p_XqEdUnR+0+D3bY_WuH4GaQTUgwg@mail.gmail.com> (raw)
In-Reply-To: <CAMZc-bytQLcWMn8X4by8=mp2==MpBOKNM7deAGUh4S6xVsGySQ@mail.gmail.com>
On Thu, Sep 23, 2021 at 6:58 PM Hongtao Liu <crazylht@gmail.com> wrote:
>
> On Fri, Sep 24, 2021 at 9:42 AM H.J. Lu <hjl.tools@gmail.com> wrote:
> >
> > On Thu, Sep 23, 2021 at 6:38 PM Hongtao Liu <crazylht@gmail.com> wrote:
> > >
> > > On Fri, Sep 24, 2021 at 9:20 AM H.J. Lu <hjl.tools@gmail.com> wrote:
> > > >
> > > > On Thu, Sep 23, 2021 at 6:17 PM liuhongt <hongtao.liu@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".
> Updated.
>
> -<!-- <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>,
> + all operations will be emulated by software emulation and the
> + <code>float</code> instructions.
> + </li>
> +</ul>
LGTM.
Thanks.
> >
> > > + 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.
>
>
>
> --
> BR,
> Hongtao
--
H.J.
next prev parent reply other threads:[~2021-09-24 2:13 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-23 5:38 [PATCH] wwwdocs: [GCC12] Mention Intel AVX512-FP16 liuhongt
2021-09-23 20:42 ` Joseph Myers
2021-09-24 1:17 ` [PATCH] [GCC12] Mention Intel AVX512-FP16 and _Float16 support liuhongt
2021-09-24 1:20 ` H.J. Lu
2021-09-24 1:44 ` Hongtao Liu
2021-09-24 1:41 ` H.J. Lu
2021-09-24 2:04 ` Hongtao Liu
2021-09-24 2:12 ` H.J. Lu [this message]
2021-10-01 10:13 ` Gerald Pfeifer
2021-10-08 1:25 ` Hongtao Liu
2023-01-28 12:40 ` Gerald Pfeifer
2023-01-29 1:20 ` [PATCH] Change AVX512FP16 to AVX512-FP16 in the document liuhongt
2023-01-29 9:55 ` Gerald Pfeifer
2023-01-29 1:23 ` [PATCH] Change AVX512FP16 to AVX512-FP16 which is official name liuhongt
2023-01-29 9:55 ` Gerald Pfeifer
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