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References: <alpine.DEB.2.22.394.2109232041400.786440@digraph.polyomino.org.uk>
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In-Reply-To: <20210924011730.97039-1-hongtao.liu@intel.com>
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Thu, 23 Sep 2021 18:20:21 -0700
Message-ID: <CAMe9rOpMHCNpcKPftzpRH26nea635uADDN2=eu3TBgK3HXSiMQ@mail.gmail.com>
Subject: Re: [PATCH] [GCC12] Mention Intel AVX512-FP16 and _Float16 support.
To: liuhongt <hongtao.liu@intel.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>, Hongtao Liu <crazylht@gmail.com>
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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.

> +      emulated by software emulation and the <code>float</code> instructions.
> +  </li>
> +</ul>
>
>  <!-- <h3 id="mips">MIPS</h3> -->
>
> --
> 2.18.1
>


-- 
H.J.