From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 32C643857C5B; Thu, 30 Sep 2021 20:22:04 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 32C643857C5B From: "qinzhao at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/102285] New flag -ftrivial-auto-var-init=zero causes crash in pr82421.c Date: Thu, 30 Sep 2021 20:22:03 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: ice-on-valid-code X-Bugzilla-Severity: normal X-Bugzilla-Who: qinzhao at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: qinzhao 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: Thu, 30 Sep 2021 20:22:04 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102285 --- Comment #10 from qinzhao at gcc dot gnu.org --- commented the following transformation in tree-ssa-ccp.c: 2733 #if 0 2734 /* The heuristic of fold_builtin_alloca_with_align differs bef= ore and 2735 after inlining, so we don't require the arg to be changed i= nto a 2736 constant for folding, but just to be constant. */ 2737 if (gimple_call_builtin_p (stmt, BUILT_IN_ALLOCA_WITH_ALIGN) 2738 || gimple_call_builtin_p (stmt, BUILT_IN_ALLOCA_WITH_ALIGN_AND_MAX)) 2739 { 2740 tree new_rhs =3D fold_builtin_alloca_with_align (stmt); 2741 if (new_rhs) 2742 { 2743 gimplify_and_update_call_from_tree (gsi, new_rhs); 2744 tree var =3D TREE_OPERAND (TREE_OPERAND (new_rhs, 0),0= ); 2745 insert_clobbers_for_var (*gsi, var); 2746 return true; 2747 } 2748 } 2749 #endif cures the ICE. "fb.3" is a new temp variable that is created inside "fold_builtin_alloca_with_align".=