From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id BEEB6385841C; Thu, 18 Nov 2021 12:39:28 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org BEEB6385841C From: "zhendong.su at inf dot ethz.ch" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/103314] New: ICE on valid code at -O1 and above on x86_64-linux-gnu: Segmentation fault Date: Thu, 18 Nov 2021 12:39:28 +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: unknown X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: zhendong.su at inf dot ethz.ch 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: Thu, 18 Nov 2021 12:39:28 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103314 Bug ID: 103314 Summary: ICE on valid code at -O1 and above on x86_64-linux-gnu: Segmentation fault Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: zhendong.su at inf dot ethz.ch Target Milestone: --- It seems to be a recent regression. [585] % gcctk -v Using built-in specs. COLLECT_GCC=3Dgcctk COLLECT_LTO_WRAPPER=3D/local/suz-local/software/local/gcc-trunk/libexec/gcc= /x86_64-pc-linux-gnu/12.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --prefix=3D/local/suz-local/software/local/gcc-trunk --enable-languages=3Dc= ,c++ --disable-werror --enable-multilib --with-system-zlib Thread model: posix Supported LTO compression algorithms: zlib gcc version 12.0.0 20211118 (experimental) [master r12-5359-g280d2838c11] (= GCC)=20 [586] %=20 [586] % gcctk -O0 small.c; ./a.out [587] %=20 [587] % gcc110 -O1 small.c; ./a.out small.c: In function =E2=80=98main=E2=80=99: small.c:3:37: warning: right shift count is negative [-Wshift-count-negativ= e] 3 | unsigned c =3D 0, d =3D c ? 1 ^ c ^ 1 >> a : 0; | ~~^~~~ [588] %=20 [588] % gcctk -O1 small.c small.c: In function =E2=80=98main=E2=80=99: small.c:3:37: warning: right shift count is negative [-Wshift-count-negativ= e] 3 | unsigned c =3D 0, d =3D c ? 1 ^ c ^ 1 >> a : 0; | ~~^~~~ gcctk: internal compiler error: Segmentation fault signal terminated program cc1 Please submit a full bug report, with preprocessed source if appropriate. See for instructions. [589] %=20 [589] % cat small.c const int a =3D -1; int main() { unsigned c =3D 0, d =3D c ? 1 ^ c ^ 1 >> a : 0; return 0; }=