From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 1863E383568B; Fri, 22 Jul 2022 07:58:21 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1863E383568B From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/106397] [13 Regression] ICE in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:645 since r13-1450-gd2a898666609452e Date: Fri, 22 Jul 2022 07:58:20 +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: 13.0 X-Bugzilla-Keywords: ice-on-valid-code X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org X-Bugzilla-Target-Milestone: 13.0 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: Fri, 22 Jul 2022 07:58:21 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106397 --- Comment #3 from Richard Biener --- The prefetching pass puts a __builtin_ia32_mfence () before the __builtin_unreachable () at the loop exit. IIRC there's a related bug that while return statements have a VUSE alternate "function returns" may lack t= hem (that includes some EH related returns as well). Since the function eventually splits loop exit edges it breaks LC SSA anyway (that's a latent issue I think).=