From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-417647-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 15248 invoked by alias); 14 Mar 2013 18:01:48 -0000
Received: (qmail 15104 invoked by uid 48); 14 Mar 2013 18:01:07 -0000
From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/56615] [4.6/4.7/4.8 Regression] Wrong code with TRANSFER of arrays of character with stride -1
Date: Thu, 14 Mar 2013 18:01:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: burnus 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: 4.6.4
X-Bugzilla-Changed-Fields: Status Known to work Keywords Last reconfirmed CC Ever Confirmed Summary Target Milestone Known to fail
Message-ID: <bug-56615-4-GAz9zfFdWf@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-56615-4@http.gcc.gnu.org/bugzilla/>
References: <bug-56615-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
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
X-SW-Source: 2013-03/txt/msg01089.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56615

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |4.1.2, 4.3.4
           Keywords|                            |wrong-code
   Last reconfirmed|                            |2013-03-14
                 CC|                            |burnus at gcc dot gnu.org
     Ever Confirmed|0                           |1
            Summary|[4.4/4.5/4.6/4.7            |[4.6/4.7/4.8 Regression]
                   |Regression] Wrong code for  |Wrong code with TRANSFER of
                   |passing arrays of character |arrays of character with
                   |                            |stride -1
   Target Milestone|---                         |4.6.4
      Known to fail|                            |4.4.0, 4.5.3, 4.6.3, 4.7.2,
                   |                            |4.8.0

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> 2013-03-14 18:01:06 UTC ---
The problem seems to be the TRANSFER in:

  call cmp (a(n:1:-1), t)
...
  subroutine cmp (b, s)
    character(len=1), dimension(:), intent(in) :: b
    c = TRANSFER (b, c)



In the dump, I see code like:

__builtin_memcpy (transfer.5, parm.4.data, MAX_EXPR
<MIN_EXPR<D.1912,D.1904>,0>);


However, that assumes that parm.4.data is contiguous and walked forwardly. In
4.4, one has the same - but additionally the calls:

D.929 = _gfortran_internal_pack (&parm.4);
...
_gfortran_internal_unpack (&parm.4, D.929);