From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 978483858C52; Tue, 31 Oct 2023 19:27:07 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 978483858C52 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1698780427; bh=SryAiSNVWSwJpOSbfpVesyVt5odgVLvnzQ9TBouyYXQ=; h=From:To:Subject:Date:From; b=XA2nlJ+cTsTNnt/nZ+KVfCLNWPkSh9k+6yMTNhEBICmCSsyQsjd22KyLSjEtxgIE6 fgDTfxXTDGn2ebGGvdYi0Zbc1DvkmTzl2A1KMp2l2c/KfS5yQlGjKKCMEkdEYI41wH GMdvdC9TLxlgWvDjyNptXbjiQbRP6wGh8eT5sDrI= From: "slyfox at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/112321] New: [14 Regression] ICE during GIMPLE pass: dse: : Segmentation fault Date: Tue, 31 Oct 2023 19:27:07 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Version: 14.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: slyfox 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: 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112321 Bug ID: 112321 Summary: [14 Regression] ICE during GIMPLE pass: dse: : Segmentation fault Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: slyfox at gcc dot gnu.org Target Milestone: --- Noticed ICE on today's gcc-master at r14-5043-g2b19c387696b0d. There it fai= ls to build binutils' gold. Extracted sample: // $ cat bug.cc void writeval(unsigned char *, long); unsigned do_write_count; void do_write() { unsigned char *pov; int limit(do_write_count > 8 ? true : do_write_count); for (int i =3D 0; i < limit; ++i) pov +=3D 2; int ext_cnt =3D do_write_count - 8; for (; 0 < ext_cnt;) { writeval(pov, 0); pov +=3D 4; ext_cnt--; } } Crashing: $ gcc/xg++ -B./gcc -g -O1 -c bug.cc -o a.o during GIMPLE pass: dse bug.cc: In function =E2=80=98void do_write()=E2=80=99: bug.cc:3:6: internal compiler error: Segmentation fault 3 | void do_write() { | ^~~~~~~~ 0x8ebef5a crash_signal gcc/toplev.cc:315 0x8b42800 phi_nodes_ptr(basic_block_def*) gcc/gimple.h:4700 0x8b42800 gsi_start_phis(basic_block_def*) gcc/gimple-iterator.cc:935 0x8b42800 gsi_for_stmt(gimple*) gcc/gimple-iterator.cc:620 0x9121a03 insert_debug_temp_for_var_def(gimple_stmt_iterator*, tree_node*) gcc/tree-ssa.cc:471 0x9121f2e insert_debug_temps_for_defs(gimple_stmt_iterator*) gcc/tree-ssa.cc:506 0x8b42690 gsi_remove(gimple_stmt_iterator*, bool) gcc/gimple-iterator.cc:567 0x8ffe08b execute gcc/tree-ssa-dse.cc:1685 $ gcc/xg++ -Bgcc -v Reading specs from ./gcc/specs COLLECT_GCC=3D./gcc/xg++ COLLECT_LTO_WRAPPER=3D./gcc/lto-wrapper Target: i686-pc-linux-gnu Configured with: ../gcc/configure --disable-bootstrap Thread model: posix Supported LTO compression algorithms: zlib gcc version 14.0.0 20231031 (experimental) (GCC)=