From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-422942-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 14850 invoked by alias); 23 May 2013 08:35:59 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 14815 invoked by uid 48); 23 May 2013 08:35:57 -0000
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/57380] [4.7/4.8/4.9 Regression] GCC 4.9.0 will not vectorize std::max and similar functions
Date: Thu, 23 May 2013 08:35:00 -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: 4.9.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.7.4
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_status cf_reconfirmed_on cf_known_to_work assigned_to target_milestone short_desc everconfirmed
Message-ID: <bug-57380-4-6Hq3OBAxem@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-57380-4@http.gcc.gnu.org/bugzilla/>
References: <bug-57380-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2013-05/txt/msg01615.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57380

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2013-05-23
      Known to work|                            |4.5.4
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
   Target Milestone|---                         |4.7.4
            Summary|GCC 4.9.0 will not          |[4.7/4.8/4.9 Regression]
                   |vectorize std::max and      |GCC 4.9.0 will not
                   |similar functions           |vectorize std::max and
                   |                            |similar functions
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
For some reason phiprop doesn't work here.  I'll investigate, but I guess
it is because the addresses are not constant but depend on the loop IV:

  <bb 3>:
  _3 = &b.data[i_2];
  _4 = &a.data[i_2];
  _10 = MEM[(const int &)&a].data[i_2];
  _11 = MEM[(const int &)&b].data[i_2];
  if (_10 < _11)
    goto <bb 5>;
  else
    goto <bb 4>;

  <bb 4>:

  <bb 5>:
  # iftmp.0_12 = PHI <_3(3), _4(4)>

  <bb 6>:
  _6 = *iftmp.0_12;