From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id DBC133858D3C; Wed, 20 Sep 2023 04:10:35 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DBC133858D3C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1695183035; bh=XDaa39DpeUSyC3z3P/+BCxrJ3nFyEOpOPAJv55u61LE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=BSQnBHrRin7skGVr4KX3UBkRZ4yjJrHCMsVCY8ja5Xfi6Ex36LgGiZWIrSyGqwyWD 2SCHBKvpI4VOVteVGJcatFRwCWmEUOE7OfGJjkq+kqRzyeoSKeXguWn8x9W/rD2ytz IUJCm4wvccBwROLRDDTXFa+ybpBoeVoDvbz0ZEWY= From: "guojiufu at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/111482] [14 Regression] ice in lower_bound with -O3 Date: Wed, 20 Sep 2023 04:10:35 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: unknown X-Bugzilla-Keywords: ice-on-valid-code, needs-reduction X-Bugzilla-Severity: normal X-Bugzilla-Who: guojiufu at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: guojiufu at gcc dot gnu.org X-Bugzilla-Target-Milestone: 14.0 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111482 --- Comment #7 from Jiu Fu Guo --- This is caused by missing to check a vr's "undefine_p". In the pattern "(X + C) / N",=20 (if (exact_mod (c) ... && range_op_handler (PLUS_EXPR).overflow_free_p (vr0, vr1)=20 ...) (plus (op @0 @2) { wide_int_to_tree (type, plus_op1 (c)); }) (if (TYPE_UNSIGNED (type) && c.sign_mask () < 0 && exact_mod (-c) /* unsigned "X-(-C)" doesn't underflow. */ && wi::geu_p (vr0.lower_bound (), -c)) In the "(if (exact_mode (c)" part, the code "overflow_free_p (vr0, vr1)" ch= ecks v0/vr are defined.=20 But in the "else" part, "if (... && wi::geu_p (vr0.lower_bound (), -c)", vr= 0 is not checked undefined_p.=