From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id F16903858D32; Sat, 11 Feb 2023 19:45:41 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F16903858D32 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1676144741; bh=pZ9jOqu3SusVKTJKFKCi+rheGZe/fGD5RNoS6TUdIBI=; h=From:To:Subject:Date:In-Reply-To:References:From; b=B/1wDh+vmhvd8RC7UnieF2igi9NL2VFATP85u50EuN9q+eJ4z6BykC7X9Upq7wcjM O40uRPqo/twc94OvIRNQuDHoqUSOKfDuwUTWi2sKgOvRAhGR+ijms/a184Vaa4kooo afbGNQB5t+BJ23PIQw5mLkCD345mr+Zuit3XBFoE= From: "chip.kerchner at ibm dot com" 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 19:45:41 +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: chip.kerchner at ibm dot com 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 #9 from Chip Kerchner --- Doesn't this work for powers of two (N) and signed values (for A, N and M)? (59 - (33 * -2)) / -2 + 31 =3D -62 + 31 =3D -29 and 59 / -2 =3D -29=