From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg1-x532.google.com (mail-pg1-x532.google.com [IPv6:2607:f8b0:4864:20::532]) by sourceware.org (Postfix) with ESMTPS id 1C3F8385780B; Fri, 15 Oct 2021 19:03:04 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 1C3F8385780B Received: by mail-pg1-x532.google.com with SMTP id e65so6994132pgc.5; Fri, 15 Oct 2021 12:03:04 -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:content-transfer-encoding; bh=ThbT87nqC6RZUFrpE+MtRrN1CcA3WOAY6XmiJpFTLE4=; b=nGh3CB59WWfkkf1J21rCI9WJVfpiCRxN/8GwGZwY4r83rv8+TQ/rxobU9QyIOnX+jT dIzsJqwWinqZ5tyv5wyhPSf8KASMjwxsxmR5eptXw6ubSnSjaH6/aYWodmbP/vSthgDQ UyQwcnfejNDFUcf/+/Jx8xuLUn/udxzWhNoY6EBA9UwQStnSxLB0xpiD8VJHA9WJMh60 IdV/IfpjYj/qmvqZqZs1DCFP2INq5fy4PS7/OqGkQjRZoJoTkx3VEdb2AjVZfB3xCMUj u3v4xDSC2yB3Mn8rLKc8UeN5MZeH7PmOZsOiBJ+w9sf/jYgk5tsHdp93AARsrNmR2UEA q3Dw== X-Gm-Message-State: AOAM531av5e0XQJKG98jjvyevTl2mw1QQOy8SD9VUSJyU4IFD2iOjm+3 Znfg5wC4NrE0yf4adjSDfYCFBfYeObmTeb4Gpzc= X-Google-Smtp-Source: ABdhPJylZRzNSjLcEUHBYagz0xBLaE/rUqJJVqDNJ+VT1QptNYjrnta8FgAdoedPaKzY8Pt8BIDBzhL1x2Np+YqjrqA= X-Received: by 2002:a63:1656:: with SMTP id 22mr10555923pgw.20.1634324582877; Fri, 15 Oct 2021 12:03:02 -0700 (PDT) MIME-Version: 1.0 References: <20211014191643.BD9D62864721@gskx-2.sc.intel.com> <6bec070e-55f1-5298-6b8c-7c39688f3f61@suse.cz> In-Reply-To: <6bec070e-55f1-5298-6b8c-7c39688f3f61@suse.cz> From: "H.J. Lu" Date: Fri, 15 Oct 2021 12:02:26 -0700 Message-ID: Subject: Re: [r12-4397 Regression] FAIL: gcc.dg/guality/pr54200.c -Og -DPREVENT_OPTIMIZATION line 20 z == 3 on Linux/x86_64 To: =?UTF-8?Q?Martin_Li=C5=A1ka?= Cc: "sunil.k.pandey" , GCC Patches , gcc-regression@gcc.gnu.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-3024.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, KAM_NUMSUBJECT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=no 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-regression@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-regression mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Oct 2021 19:03:05 -0000 On Fri, Oct 15, 2021 at 2:00 AM Martin Li=C5=A1ka wrote: > > On 10/14/21 21:16, sunil.k.pandey wrote: > > FAIL: gcc.dg/guality/pr54200.c -Og -DPREVENT_OPTIMIZATION line 20 z = =3D=3D 3 > > Hello. > > I've just verified the assembly is identical before and after the revisio= n. > So it must be a false positive. > > Cheers, > Martin I saw Breakpoint 1, foo (z=3D3, x=3D, b=3D1) at /export/gnu/import/git/gitlab/x86-gcc/gcc/testsuite/gcc.dg/guality/pr54200.= c:20^M 20 return a; /* { dg-final { gdb-test . "z" "3" { xfail { aarch64*-*-* && { no-opts "-O0" "-Og" } } } } } */^M $1 =3D [uninitialized] 3^M $2 =3D 3^M A debugging session is active.^M ^M Inferior 1 [process 4053185] will be killed.^M ^M Quit anyway? (y or n) [answered Y; input not from terminal]^M [uninitialized] 3 !=3D 3 FAIL: gcc.dg/guality/pr54200.c -Og -DPREVENT_OPTIMIZATION line 20 z =3D= =3D 3 I don't know where [uninitialized] came from. I can't reproduce it when I run gdb by hand. --=20 H.J.