From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id A7CD0385741A; Mon, 2 May 2022 22:31:47 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A7CD0385741A From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/105453] load introduced by ce1 for conditional loads at -O1, might cause issues with the C/C++ memory model Date: Mon, 02 May 2022 22:31:47 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: rtl-optimization X-Bugzilla-Version: 11.3.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED 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: short_desc 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: Mon, 02 May 2022 22:31:47 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105453 Andrew Pinski changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|wrong choice of source in |load introduced by ce1 for |load instruction |conditional loads at -O1, | |might cause issues with the | |C/C++ memory model --- Comment #3 from Andrew Pinski --- The problem shows up in ce1. Someone who is more in tune with the C/C++ mem= ory model should figure out if adding an extra load here is valid or not. I think it is valid still since there is no load barrier used.=