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 7094D3857C5A; Wed,  5 Jan 2022 23:45:09 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7094D3857C5A
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/10520] induction variable analysis not used
 to eliminate comparisons
Date: Wed, 05 Jan 2022 23:45:09 +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: 3.2
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: <bug-10520-4-ZELErjG8oG@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-10520-4@http.gcc.gnu.org/bugzilla/>
References: <bug-10520-4@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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Wed, 05 Jan 2022 23:45:09 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D10520

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Hmm, shouldn't we convert:
  _24 =3D MAX_EXPR <n_in_31, n_out_32>;
  if (_24 < _tmp0_27(D))
    goto <bb 4>; [94.50%]
  else
    goto <bb 5>; [5.50%]

  <bb 4> [local count: 906139990]:
  _25 =3D MAX_EXPR <n_in1_33, n_out1_34>;
  if (_25 < _tmp0_27(D))
    goto <bb 3>; [94.50%]
  else
    goto <bb 5>; [5.50%]
Which is:

if (MAX_EXPR <n_in_31, n_out_32> < _tmp0_27 && MAX_EXPR <n_in1_33, n_out1_3=
4> <
_tmp0_27) goto 3 else goto 5

Into:
if (MAX_EXPR<MAX_EXPR <n_in_31, n_out_32>, MAX_EXPR <n_in1_33, n_out1_34> >=
 <
_tmp0_27)  goto 3 else goto 5

Also? To simplify things a little more?=