From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <prathamesh.kulkarni@linaro.org>
Received: from mail-pj1-x102b.google.com (mail-pj1-x102b.google.com
 [IPv6:2607:f8b0:4864:20::102b])
 by sourceware.org (Postfix) with ESMTPS id 61DB43850426
 for <gcc-patches@gcc.gnu.org>; Mon, 31 May 2021 10:32:32 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 61DB43850426
Received: by mail-pj1-x102b.google.com with SMTP id
 k22-20020a17090aef16b0290163512accedso1502391pjz.0
 for <gcc-patches@gcc.gnu.org>; Mon, 31 May 2021 03:32:32 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20161025;
 h=x-gm-message-state:mime-version:references:in-reply-to:from:date
 :message-id:subject:to:cc;
 bh=F/DpIf6tl1IwhKINw0+6zIU2799RwqUh47U+1EO6uHM=;
 b=FpldBw3sqyprO1ODcQzak7NLsSEzDYoD0kSoGh9fJBvCG+O7rTDqc3mbTajJNuoJ7I
 fLCtzUf76+31w31h5U4NcxF8E1WVPiizGR2QLScxdmV+MOubvAgggpdWjVJ1FjFJpeNs
 OEmXEX7W7gwZwvBYaszCfADxOuaECSlIQnTXVXIBFKc4V+C3/z270r3vqGdmpyuqlCV4
 QIv7ppitM5K7vhRoo55soZk+vUAiWw0OM1i538zqZOtVcI8RM+zfA0o1L/8EuBGeo33C
 7ezVShJJju/KCboqtYaJsRBruKMFeSl2FJZQ73dvdMKaKcP0miiDDLStW3/I4Amxnqlz
 2TEQ==
X-Gm-Message-State: AOAM531OEKfPfNbP08Hgs/gphwRlEJLw0wXkpT9t3o88NvetRQ75rFzI
 wjF2GOuV3/v+7jwvejBW029ZaUtYFf1fxKBuU0nJKHOV/hE=
X-Google-Smtp-Source: ABdhPJx/3F9VOn0tG+CuZF1hvSNLNlMIVT2Qa7eKNWix4mN8uhxFcUJgs4/vs9G1HgnDqRW7jup6hGXqUnGY1I2zWsk=
X-Received: by 2002:a17:90b:30cb:: with SMTP id
 hi11mr18409645pjb.204.1622457150904; 
 Mon, 31 May 2021 03:32:30 -0700 (PDT)
MIME-Version: 1.0
References: <CAAgBjMmZ=_zkF5z9Dj-LYp_DgKXAR5Zo6etnp0P2y61ezMBe_A@mail.gmail.com>
 <4b7e5a3-5596-3dcb-e142-53cb7a909f7b@hippo.saclay.inria.fr>
 <CAAgBjMkO3_rJOEWvdZsYf6kxb3bqHPny_mRycJDoESHUNn1wdA@mail.gmail.com>
In-Reply-To: <CAAgBjMkO3_rJOEWvdZsYf6kxb3bqHPny_mRycJDoESHUNn1wdA@mail.gmail.com>
From: Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
Date: Mon, 31 May 2021 16:01:54 +0530
Message-ID: <CAAgBjM=TJ-iWCM1jmXg26gbtxhh28ZnAc+h2xG6u_p3UCPmevw@mail.gmail.com>
Subject: Re: [ARM] PR66791: Replace calls to builtin in vmul_n (a, b)
 intrinsics with __a * __b
To: gcc Patches <gcc-patches@gcc.gnu.org>
Content-Type: text/plain; charset="UTF-8"
X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00, DKIM_SIGNED,
 DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,
 SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) 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 <gcc-patches.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-patches>,
 <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-patches/>
List-Post: <mailto:gcc-patches@gcc.gnu.org>
List-Help: <mailto:gcc-patches-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-patches>,
 <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 31 May 2021 10:32:33 -0000

On Mon, 31 May 2021 at 15:22, Prathamesh Kulkarni
<prathamesh.kulkarni@linaro.org> wrote:
>
> On Wed, 26 May 2021 at 14:07, Marc Glisse <marc.glisse@inria.fr> wrote:
> >
> > On Wed, 26 May 2021, Prathamesh Kulkarni via Gcc-patches wrote:
> >
> > > The attached patch removes calls to builtins in vmul_n* (a, b) with __a * __b.
> >
> > I am not familiar with neon, but are __a and __b unsigned here? Otherwise,
> > is vmul_n already undefined in case of overflow?
> Hi Marc,
> Sorry for late reply, for vmul_n_s*, I think they are signed
> (int<width>x<width>_t).
Oops, I meant int<width>x<nelems>_t.
> I am not sure how should the intrinsic behave in case of signed overflow,
> but I am assuming it's OK since vmul_s* intrinsics leave it undefined too.
> Kyrill, is it OK to leave vmul_s* and vmul_n_s* undefined in case of overflow ?
>
> Thanks,
> Prathamesh
> >
> > --
> > Marc Glisse