From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id AF5073858C27; Wed, 15 Dec 2021 22:12:52 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AF5073858C27 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/67413] Complex NOP expanded to several operations Date: Wed, 15 Dec 2021 22:12:52 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 6.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- 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: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 15 Dec 2021 22:12:52 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D67413 --- Comment #4 from Andrew Pinski --- As for the other testcase: y_3 =3D x_2(D) & -4294967296; z_4 =3D (intD.9) x_2(D); _1 =3D (long intD.12) z_4; _5 =3D _1 | y_3; If we could optimize: z_4 =3D (intD.9) x_2(D); _1 =3D (long intD.12) z_4; Into: _1 =3D x_2(D) & 4294967295; It would just work.=