From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id E2C193858C83; Tue, 2 May 2023 00:15:46 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E2C193858C83 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1682986546; bh=WuByYTbeKFxCENG/IG54DkkhH/9/LDYZ4WqcuRlXXoU=; h=From:To:Subject:Date:In-Reply-To:References:From; b=Ry++DXZSNa76MF/hKL9AfK/KcnUbrdTN2AZci5IAd7faNUTyvPvjnxFLx30xGekp9 3uvD8LiR64+ayg6ZXyh5ct+2GBX+z5MkKOTFuAgRhIGLgv7Da/hDSR7wvSHPLdNnq9 MxExkr7gG60t612s+fA0qQL+VuoB6nJQx9scA9Jk= From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/79119] absolute value of a pointer difference can be assumed to be less than or equal to PTRDIFF_MAX Date: Tue, 02 May 2023 00:15:45 +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: 7.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement 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: --- 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=3D79119 --- Comment #4 from Andrew Pinski --- Hmm: # RANGE [irange] long unsigned int [0, 2305843009213693951][16140901064495857664, +INF] iftmp.0_7 =3D (long unsigned intD.10) _19; if (iftmp.0_7 > 2305843009213693951) So that is _19 < 0 If I read this correctly. The only reason why it was not converted is because of the /4 that was befo= re. So we have a hole in the range.=