From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <jwakely.gcc@gmail.com>
Received: from mail-wm1-x332.google.com (mail-wm1-x332.google.com
 [IPv6:2a00:1450:4864:20::332])
 by sourceware.org (Postfix) with ESMTPS id D67633858438
 for <gcc-help@gcc.gnu.org>; Tue,  8 Feb 2022 16:58:13 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D67633858438
Received: by mail-wm1-x332.google.com with SMTP id
 l12-20020a7bc34c000000b003467c58cbdfso1650808wmj.2
 for <gcc-help@gcc.gnu.org>; Tue, 08 Feb 2022 08:58:13 -0800 (PST)
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=Z1PcvTlx75jfRN/cnE9OVhVvcQVcKFDvAgvARmN1wCk=;
 b=RlpDO0Uahvrym17rX4gHxl1qRNLQz9qtjoTBN7daTB9+qawPk87X5+/RVbaFNDa6XA
 owU8ErIT2lsoi+BQs9+jShZV1kkmJIhxv2iFag7GQce6X0NTfhV5hrYdJn821s5ybyYY
 qTrWXg1tST/79z8LJ99Tv87pIYYara4jGGELPBdR0MhHWmOQhDpWucqggo3t65YLE1hC
 gwiH1oySJoZlhnGcHU/OdJL+k4BGTwV+5DUGkQY2gTQf5dSWsN8dgJOsBpeKQJrTuGmw
 /x8hRHaPumJhQzaypYKk8cfpCB3Clp+TsmsEaW33IyQ4/8/7AzZRvbjqSKDM5FYGuZ+h
 8qYg==
X-Gm-Message-State: AOAM532Rmp3auoORkFmDYQB2hez1gu6ak6mvCo1ZsT27PYfYbyjI8Y+o
 z5ZiF7Db0dRwaxpHy5uhG3dM+GcracDtSPRFY1w=
X-Google-Smtp-Source: ABdhPJzxNJ4obh2C3x6c0WsGDSEuzRX5FrwFxQvgqCbXihWnXQTwXRwo6KbGXlZSdd0W6PBRHA0oDtDUa1ZEt3EXcsE=
X-Received: by 2002:a7b:cd15:: with SMTP id f21mr1861781wmj.157.1644339492668; 
 Tue, 08 Feb 2022 08:58:12 -0800 (PST)
MIME-Version: 1.0
References: <CABhGnjuO8VKVg=H60BT1LhH1j+cLoR2X7Pky5Bc-xtP+Jns=8Q@mail.gmail.com>
In-Reply-To: <CABhGnjuO8VKVg=H60BT1LhH1j+cLoR2X7Pky5Bc-xtP+Jns=8Q@mail.gmail.com>
From: Jonathan Wakely <jwakely.gcc@gmail.com>
Date: Tue, 8 Feb 2022 16:58:01 +0000
Message-ID: <CAH6eHdSni2Dz1VXzb1cbG5ee2z3rD1Z54nWZqSN=NKz4NsDSQQ@mail.gmail.com>
Subject: Re: Extended doubt regarding the bug 93432
To: Krishna Narayanan <krishnanarayanan132002@gmail.com>
Cc: gcc-help <gcc-help@gcc.gnu.org>
X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00, DKIM_SIGNED,
 DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, HTML_MESSAGE,
 KAM_NUMSUBJECT, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP,
 T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
Content-Type: text/plain; charset="UTF-8"
X-Content-Filtered-By: Mailman/MimeDel 2.1.29
X-BeenThere: gcc-help@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-help mailing list <gcc-help.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-help>,
 <mailto:gcc-help-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-help/>
List-Post: <mailto:gcc-help@gcc.gnu.org>
List-Help: <mailto:gcc-help-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-help>,
 <mailto:gcc-help-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Tue, 08 Feb 2022 16:58:15 -0000

On Tue, 8 Feb 2022 at 16:25, Krishna Narayanan via Gcc-help <
gcc-help@gcc.gnu.org> wrote:

> Hello,
> As an extension to the bug 93432
> (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93432), I would like to
> add a few more points,here in the given code
> (https://godbolt.org/z/sYjqjqh3d) there is a warning averted but there
> is no warning shown for this code
> (https://gcc.godbolt.org/z/oo5sf4oec) .
> I tried it with "-fno-strict-aliasing -fwrapv
> -fno-aggressive-loop-optimizations" and "fsanitize=undefined".There
> are no errors for gcc but clang has runtime errors,the error for
> clang: https://gcc.godbolt.org/z/1hq8x1o8E .
>
> Can we have a warning in the second case as well? It will be much more
> convenient as there is a lapse of initialization.
>

Yes, ideally it would warn.