From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-439889-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 12782 invoked by alias); 10 Jan 2014 01:00:25 -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 12723 invoked by uid 48); 10 Jan 2014 01:00:19 -0000
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/59744] miscompilation of unsigned comparison on aarch64
Date: Fri, 10 Jan 2014 01:00:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 4.9.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia 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: keywords bug_status cf_reconfirmed_on everconfirmed
Message-ID: <bug-59744-4-N4zTBmyH1X@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-59744-4@http.gcc.gnu.org/bugzilla/>
References: <bug-59744-4@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: 2014-01/txt/msg01031.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59744

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-01-10
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(insn 14 13 15 2 (set (reg:CC_SWP 66 cc)
        (compare:CC_SWP (neg:DI (reg:DI 0 x0 [ offset ]))
            (reg:DI 1 x1 [orig:85 D.3895 ] [85]))) t7.c:11 114 {*compare_negdi}
     (expr_list:REG_DEAD (reg:DI 1 x1 [orig:85 D.3895 ] [85])
        (expr_list:REG_DEAD (reg:DI 0 x0 [ offset ])
            (nil))))

--- CUT ---
Here is a testcase that fails at -O1 and above without any arguments.

int a[2] = { 10, 20 };

int
is_bigger (long, int) __attribute__((noinline,noclone));

int
is_bigger (long offset, int index)
{
  unsigned long size = -offset;

  if (size > a[index])
   return 1;

  return 0;
}


int
main (int argc, char** argv)
{
  long v;
  if (is_bigger(0, 0))
    __builtin_abort ();
  if (!is_bigger(1, 0))
    __builtin_abort ();
  if (is_bigger(-10, 0))
    __builtin_abort ();
  if (!is_bigger(10, 0))
    __builtin_abort ();
  return 0;
}