From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 9DA753857C5F; Mon, 19 Oct 2020 16:09:27 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9DA753857C5F From: "dcb314 at hotmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/97496] New: ice during during GIMPLE pass: cddce Date: Mon, 19 Oct 2020 16:09:27 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Version: 11.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: dcb314 at hotmail dot com 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: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone Message-ID: 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, 19 Oct 2020 16:09:27 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97496 Bug ID: 97496 Summary: ice during during GIMPLE pass: cddce Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: dcb314 at hotmail dot com Target Milestone: --- For this C code: int a; int b[]; void c(unsigned g) { if (a) { long e =3D g, d =3D e; int f =3D 0; for (; f < 4; f++) { b[f] =3D d; d >>=3D 8; } } } with compiler flag -O3, does this: during GIMPLE pass: cddce bug657.c: In function =E2=80=98c=E2=80=99: bug657.c:3:6: internal compiler error: in mark_operand_necessary, at tree-ssa-dce.c:173 3 | void c(unsigned g) { | ^ 0x5e63bd mark_operand_necessary ../../trunk.git/gcc/tree-ssa-dce.c:173 0x5e63bd propagate_necessity ../../trunk.git/gcc/tree-ssa-dce.c:775 The problem first seems to occur sometime between 20201016 and 20201017.=