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 9A2433858404; Mon, 13 Feb 2023 20:58:56 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9A2433858404
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1676321936;
	bh=BSX+66zPM1LMb4mkN9jPBapox0qnu4ERhNbA8bgexVQ=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=fSxuXCZJldb12Ms7n+ZQzsXNhkRdbGg+B9IY2GT6yvwDGAJkNI3gjEgoW2stzuX+w
	 luKtiBjxDXN92zqy7B6EtxNWjt1YJ9ePMDaMxqrZ4x2IXD4KORLtoQ/DXjrj2b899O
	 AoudmbULHML8cDbI2P25diWScYDMhTOrw0p1p1kc=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.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: Mon, 13 Feb 2023 20:58:56 +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: 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: component
Message-ID: <bug-108757-4-w7jJlBS7GF@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-108757-4@http.gcc.gnu.org/bugzilla/>
References: <bug-108757-4@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=3D108757

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|rtl-optimization            |tree-optimization

--- Comment #17 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  _13 =3D rows_8(D) + 18446744073709551612;
  _15 =3D _13 >> 2;
  doloop.8_5 =3D _15 + 1;


This is what IV-OPTS produces.

Reduced testcase:
typedef __SIZE_TYPE__ size_t;

void convert(size_t rows, float*src, float *result)
{
  for(size_t i =3D 0; i + 4 <=3D rows; i+=3D4) {
    float t =3D src[i];
    result[i] =3D t;
  }
}=