From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 36C093858288; Wed, 9 Aug 2023 07:11:29 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 36C093858288 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1691565089; bh=qlUYpmMP35V3wC9Uv1bj96y1v+p24IDku612lkhRWwk=; h=From:To:Subject:Date:In-Reply-To:References:From; b=hOWJnja3yczb4O7W8pdLCtglLdD4hVd5zyS17nCOOSM1lnAP+fVosUplK4rvpsDT9 XXHRBMXnt+3RkBAjBVLw5wjCf3OqeUxGX8LJGsX8E+z5QNh4+1dHWxWsXqLgxl56du FkLNSa7M3ww4y+2vt4BbN8eIVRT2H69wu0FYv37M= From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/110540] [14 Regression] Dead Code Elimination Regression since r14-1163-gd8b058d3ca4 Date: Wed, 09 Aug 2023 07:11:28 +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: 14.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia 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: 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=3D110540 --- Comment #2 from Andrew Pinski --- So what is happening is EVRP is able to figure out _35 in the below: # RANGE [irange] int [-8, 0] _12 =3D (intD.6) j_16; # RANGE [irange] unsigned char [0, 0][248, +INF] b.7_32 =3D (unsigned char) j_16; # RANGE [irange] unsigned char [239, 247] _34 =3D b.7_32 + 247; # RANGE [irange] char [-17, -9] _35 =3D (charD.7) _34; Is -9 rather than a range. And then everything goes down here from there. Including loop detection ...=