From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 5D1CC3858CDB; Sat, 11 Feb 2023 13:14:52 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 5D1CC3858CDB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1676121292; bh=PmQ+feN+xYKRpJcDs/MJkZ4dBIbyMYtdtx++bCHLc0Y=; h=From:To:Subject:Date:In-Reply-To:References:From; b=lHJ+20ckiXO1XbpC+B9rS24n4TEgKC0gtsHuoVm5qOdLKi9bsy2Z2G+0CniEVkpdi tVeuggm5pG5YTM0ZP7WTnPMNOnfK9uQxW6oNn6wTH65RonPiAHcvPoQQepsj6Kgyos 484kNxT+enCGPAvTMqrCTGetteDGEM0m1ax0DSpM= From: "anlauf at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/108757] We do not simplify (a - (N*M)) / N + M -> a / N Date: Sat, 11 Feb 2023 13:14:52 +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: 13.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: anlauf 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=3D108757 --- Comment #3 from anlauf at gcc dot gnu.org --- (In reply to Andrew Pinski from comment #2) > I am not sure this can be done in the normal case unless you know the ran= ge > of a to be [64...INF] . > The wrap around case might be an issue ... > But I am not 100% sure. It is. Just print foo(0).=