From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 734AC3858413; Sun, 14 Nov 2021 10:25:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 734AC3858413 From: "aldyh at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/103219] [12 Regression] ICE Segmentation fault at -O3 (during GIMPLE pass: unrolljam) since r12-4526-gd8edfadfc7a9795b Date: Sun, 14 Nov 2021 10:25:02 +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: 12.0 X-Bugzilla-Keywords: ice-on-valid-code X-Bugzilla-Severity: normal X-Bugzilla-Who: aldyh at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.0 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cf_reconfirmed_on everconfirmed bug_status 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: Sun, 14 Nov 2021 10:25:02 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103219 Aldy Hernandez changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2021-11-14 Ever confirmed|0 |1 Status|UNCONFIRMED |NEW --- Comment #1 from Aldy Hernandez --- Looks like a latent bug elsewhere as we're not threading anything. For that matter, test fails even with -fno-thread-jumps. $ ./cc1 a.c -O3 -fno-thread-jumps -quiet -w during GIMPLE pass: unrolljam a.c: In function =E2=80=98main=E2=80=99: a.c:3:5: internal compiler error: Segmentation fault 3 | int main() { | ^~~~ 0x133a4fb crash_signal Seems like tree_loop_unroll_and_jam is dereferencing a null return from single_dom_exit(): auto_bitmap exit_bbs; bitmap_set_bit (exit_bbs, single_dom_exit (outer)->dest->index); todo |=3D do_rpo_vn (cfun, loop_preheader_edge (outer), exit_bbs); (gdb) p debug(outer) loop_1 (header =3D 9, latch =3D 26, niter =3D ) $6 =3D void (gdb) p single_dom_exit (outer) $7 =3D =