From nobody Mon Mar 18 19:50:31 2024 X-Original-To: bugs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4Tz57C2WlSz5DsF3 for ; Mon, 18 Mar 2024 19:50:31 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Tz57C1VClz4FCq for ; Mon, 18 Mar 2024 19:50:31 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1710791431; a=rsa-sha256; cv=none; b=j7VkMycRsMfY02pVTj2grpor3qzrzGuA92UgZLFZi7rzaKMoQc3148dFLdMDrS01H9tARr 3Rrg1HsdAXlmkMIlEcXLhitcTtaJMWqWSeOv7qQaMA21ons3A9pgBcZjBOTGllYgHWaUBS GaDZBH2VMg+XJDAQ9e58Mzcz8PDedJ/GZ2n2WLMiIsD6dW9TkrP6w9Bd6spMSX1DsCsxPb P7cadYVN6tZ1Xye0glqAI2MPMENuPNcmr1i6sLh5KUDA5zV8iM6G6eajlfGlg/aG+jdxOz ZWBersZ2KPyILoOdCL0P900Ct2nR0YcBA0SEv/R6CcXA9aexlOtMGjoQmVVZkQ== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1710791431; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jwm1IkTg9BsSQSc+b+VGPDJKDdi4MbB1hGNd+YNxeos=; b=DO3sKGkbAvtJy4P18sGVghp2RkfLEjsS84LDf2xBEtx/eQlnGpRUyxwmZE6t3DlN+MIiXu eW2sFHzAWvQV4qwiWeZYhnlng8PkCrYljI7y98kuTN0qRIOQFST4NbS4cf0Z+WUgJocyXs aLmDgd/638+O4zw7h8k3uLYsIbGmTeHecztEFhdujhSmvAYQuhSw+L9MBnYHNCqUhMoKDn VFNCgSSRaLorevle6biiOFh494emTtVIYTOlVR/ReHZrd3BXyM4Fj89cx4HapAq4s/aNE4 lJaDB4Y3Rfv6KQKLwD48rde74MZVg6/vvB10i8Jk0Qdk3qUyUaKTcWVd4WburA== Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4Tz57C15fjzcXD for ; Mon, 18 Mar 2024 19:50:31 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 42IJoVrY031194 for ; Mon, 18 Mar 2024 19:50:31 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 42IJoVD0031188 for bugs@FreeBSD.org; Mon, 18 Mar 2024 19:50:31 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 277783] libc fma() doesn't not return the correct zero sign Date: Mon, 18 Mar 2024 19:50:31 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 14.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: kargl@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@freebsd.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D277783 --- Comment #2 from Steve Kargl --- So, I don't loose a reduced version of the code: #include #include int main(void) { volatile double x =3D 0x1p-500, y =3D 0x1p-550, z =3D 0x1p-1000; double a, b, c, r; a =3D x-y; b =3D x+y; c =3D -z; r =3D fma(a, b, c); /* * Should print -0 instead of +0. */ printf("fma(%+a, %+a, %+a) =3D %+g\n", a, b, c, r); return 0; } % cc -o z -O3 a.c -lm && ./z fma(+0x1.ffffffffffff8p-501, +0x1.0000000000004p-500, -0x1p-1000) =3D +0 % cc -o z -O3 a.c -mfma -lm && ./z fma(+0x1.ffffffffffff8p-501, +0x1.0000000000004p-500, -0x1p-1000) =3D -0 --=20 You are receiving this mail because: You are the assignee for the bug.=