From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vs1-xe2f.google.com (mail-vs1-xe2f.google.com [IPv6:2607:f8b0:4864:20::e2f]) by sourceware.org (Postfix) with ESMTPS id 50E213858D29 for ; Fri, 24 Sep 2021 01:38:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 50E213858D29 Received: by mail-vs1-xe2f.google.com with SMTP id 66so4476464vsd.11 for ; Thu, 23 Sep 2021 18:38:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=dWT/rvhftm5Jz3eIPuAjMHW+R1G0q3gueSaoxvSG89A=; b=Kv4GSMvObEpstBNGv+UQShkRc5HiHC5dcL1drg/WU5CugViRwJqKYcOJtQfAb7Aw6B tolpXf804eHOZc+8LU5JupBrj0Fz9e3f3USd7JyZ7Wg9kxO0NONIlrE2qpBwAyiuzIHD E9csPJyBhgK9eeBKo9XQ7j6SSuyisSQsKL/YvM+qMweDzkBDNGopXqsbuTNaOAGviN45 waJEDvR/VUnqgqTp78u7Ssxx5LrVXgTmP9NgFrNCLoZCyU5V39QcDeS9GNpSot7I5p+O SidAEBJx30/oGw5tJgEgz4yQm5iPNym41uwmlP89JzwpV1VUm0gPsvJA32XlfxjSY7CO EdHg== X-Gm-Message-State: AOAM531/xCUjAz390tid1adqtB4R+XOc6Rk9Df5zK6GFXI4OzLtLdnRC unBjP7CkGLxQUhww2KuhmDZFgWxjdGfR4oMYlks= X-Google-Smtp-Source: ABdhPJzCTvz58LCc2eqVgw437V8ecMoZ3IdFNdBCX4/ioeUYktOXt5jZJX9Ev3fSh/2htZRcHq2cbL2639kqsvK2IDE= X-Received: by 2002:a05:6102:3f12:: with SMTP id k18mr7577039vsv.14.1632447493691; Thu, 23 Sep 2021 18:38:13 -0700 (PDT) MIME-Version: 1.0 References: <20210924011730.97039-1-hongtao.liu@intel.com> In-Reply-To: From: Hongtao Liu Date: Fri, 24 Sep 2021 09:44:32 +0800 Message-ID: Subject: Re: [PATCH] [GCC12] Mention Intel AVX512-FP16 and _Float16 support. To: "H.J. Lu" Cc: liuhongt , GCC Patches Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-9.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Sep 2021 01:38:15 -0000 On Fri, Sep 24, 2021 at 9:20 AM H.J. Lu wrote: > > On Thu, Sep 23, 2021 at 6:17 PM liuhongt 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.

> > > > > > > > - > > +

IA-32/x86-64

> > +
    > > +
  • New ISA extension support for Intel AVX512-FP16 was added to GCC. > > + AVX512FP16 intrinsics are available via the -mavx512fp16 > > + compiler switch. > > +
    • > > +
  • For both C and C++, The _Float16 type is supported on > > + x86 systems with SSE2 enabled. Without {-mavx512fp16}, > > + _Float16 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 +
  • For both C and C++, The _Float16 type is supported on + x86 systems with SSE2 enabled. Without {-mavx512fp16}, + no real AVX512-FP16 instructions are generated, all operations will be + emulated by software emulation and the float instructions. +
    • > > + emulated by software emulation and the float instructions. > > + > > +
> > > > > > > > -- > > 2.18.1 > > > > > -- > H.J. -- BR, Hongtao