From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 4DE223858413; Tue, 9 Aug 2022 07:57:42 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4DE223858413 From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/106568] -freorder-blocks-algorithm appears to causes a crash in stable code, no way to disable it Date: Tue, 09 Aug 2022 07:57:42 +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: 12.1.1 X-Bugzilla-Keywords: EH, wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth 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: 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: Tue, 09 Aug 2022 07:57:42 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106568 --- Comment #21 from Richard Biener --- Try -fsanitize=3Dunreachable - when reordering BBs makes crashes appear/dis= appear the most likely culprit is we run into a path deemed unreachable which mean= s we fall through to random code. You can also try looking at the -fdump-tree-optimized dump and find the function that's not catching what it is supposed to catch to see if there's= any __builtin_unreachable () calls around.=