From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-430604-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 15268 invoked by alias); 26 Sep 2013 14:47:28 -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 15229 invoked by uid 48); 26 Sep 2013 14:47:26 -0000
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/57223] Auto-vectorization fails for nested multiple loops depending on type of array
Date: Thu, 26 Sep 2013 14:47:00 -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: 4.7.3
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: NEW
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: bug_status cf_reconfirmed_on everconfirmed
Message-ID: <bug-57223-4-8WfmIQ7jpD@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-57223-4@http.gcc.gnu.org/bugzilla/>
References: <bug-57223-4@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: 2013-09/txt/msg01844.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57223

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-09-26
     Ever confirmed|0                           |1

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #5)
> (In reply to Usishchev Yury from comment #3)
> > I'm testing it on current trunk, and second loop is not vectorized both with
> > floating point and integer types.
> > For floating point types it is not vectorized due to control flow in loop:
> > 
> >  <bb 15>:
> > // ...
> > if (t_56 > _61)
> >   goto <bb 16>;
> > else
> >   goto <bb 17>;
> >  <bb 16>:
> >  <bb 17>:
> > # iftmp.2_7 = PHI <_61(16), t_56(15)>
> > 
> > This can be optimized to MIN_EXPR in phiopt pass, but is not because of NaNs:
> 
> Even without MIN_EXPR, ifcvt should turn this into a COND_EXPR that can be
> vectorized, no?

I think it is.  Both loops are vectorized with -O3 -fno-tree-pre and test_t ==
float on x86_64.

Confirmed for the PRE issue.