From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-274288-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 6417 invoked by alias); 28 Jan 2009 14:18:06 -0000
Received: (qmail 6390 invoked by uid 48); 28 Jan 2009 14:17:54 -0000
Date: Wed, 28 Jan 2009 14:18:00 -0000
Subject: [Bug c++/39002]  New: codegen bug?
X-Bugzilla-Reason: CC
Message-ID: <bug-39002-11564@http.gcc.gnu.org/bugzilla/>
Reply-To: gcc-bugzilla@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org
From: "r dot emrich at de dot tecosim dot com" <gcc-bugzilla@gcc.gnu.org>
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: 2009-01/txt/msg03090.txt.bz2

I have a complex C++ application, which used to work at least until gcc-4.4.0
snapshot 20081219, which now segfaults in a strange way.

double distance_2(NODE *P_node1, NODE *P_node2)
{
  return
sqrt(((*P_node1).globalx-(*P_node2).globalx)*((*P_node1).globalx-(*P_node2).globalx)+
             
((*P_node1).globaly-(*P_node2).globaly)*((*P_node1).globaly-(*P_node2).globaly)+
             
((*P_node1).globalz-(*P_node2).globalz)*((*P_node1).globalz-(*P_node2).globalz));
}


void calc_tria_height_2(NODE *n1, NODE *n2, NODE *n11,ostream &out_info,int
&xerror,int &xwarning,double &x,double &y,double &z)
{
  if( distance_2(n1,n2) == 0.0 )
    {
      x = (*n11).globalx;
      y = (*n11).globaly;
      z = (*n11).globalz;
      return;
    }
  if( distance_2(n1,n11) == 0.0 )
    {
      x = (*n11).globalx;
      y = (*n11).globaly;
      z = (*n11).globalz;
      return;
    }
  if( distance_2(n2,n11) == 0.0 )
    {
      x = (*n11).globalx;
      y = (*n11).globaly;
      z = (*n11).globalz;
      return;
    }

  double a1, b1 , c1, la1, la1max;
  double dx, dy, dz, dxyz;
  double dxa1;


  a1 = (*n2).globalx - (*n1).globalx;
  b1 = (*n2).globaly - (*n1).globaly;
  c1 = (*n2).globalz - (*n1).globalz;

  la1max = sqrt (a1 * a1 + b1 * b1 + c1 * c1);

  a1 = a1 / la1max;
  b1 = b1 / la1max;
  c1 = c1 / la1max;

  dx = (*n1).globalx - (*n11).globalx;
  dy = (*n1).globaly - (*n11).globaly;
  dz = (*n1).globalz - (*n11).globalz;

  dxyz = dx * dx + dy * dy + dz * dz;

  dxa1 = 2.0 * dx * a1 + 2.0 * dy * b1 + 2.0 * dz * c1;

  la1 = -dxa1 / 2.0;

  x = (*n1).globalx + (a1 * la1);
  y = (*n1).globaly + (b1 * la1);
  z = (*n1).globalz + (c1 * la1);

  return;
}

compiled with -g0 -O3 it segfaults at the last return.

I will upload the assembler files for gcc snapshot and for trunk.


-- 
           Summary: codegen bug?
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: r dot emrich at de dot tecosim dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-mingw32


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39002