From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 3E80E3858404; Thu, 10 Aug 2023 06:57:16 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3E80E3858404
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1691650636;
	bh=vdkc4QT6dkCUQ8iuq1tbT2GS/X7bqkOoQNbqtB8Afjw=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=ZEphQLW+aTF6qVgc60SLoG1MkmJd4tpx0BIt+KkV/dQPSZa7t7wxlUhdIR6AdWYUp
	 DxrQdHOpL/Sz104Ub6I6pCCk/9Z/zgo18FZRV7DXaKfZe2gijn/eypKJnfARVAnEee
	 A0GvnuTQIrd5nxPrHlMek8zTevHuCc8KG6glE4WI=
From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/66678] loop counter not accurately described
 by vrp
Date: Thu, 10 Aug 2023 06:57:15 +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: 6.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: rguenther at suse dot de
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: <bug-66678-4-2wvXP0maYj@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-66678-4@http.gcc.gnu.org/bugzilla/>
References: <bug-66678-4@http.gcc.gnu.org/bugzilla/>
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: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D66678

--- Comment #5 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 9 Aug 2023, pinskia at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D66678
>=20
> --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
> So in GCC 12+ after evrp
>   # RANGE [0, 4294967294] NONZERO 4294967295
>   _1 =3D (long unsigned intD.16) i_9;
>   # RANGE [0, 17179869176] NONZERO 17179869180
>   _2 =3D _1 * 4;
> ...
>   # RANGE [1, 4294967295]
>   i_17 =3D i_9 + 1;
>=20
> So maybe this has been fix ...

Note with ranger there's a regression WRT loop IVs not handled by
SCEV because it no longer iterates.=