[Bug tree-optimization/19716] New: Segfault with -ftree-vectorize

[Bug tree-optimization/19716] New: Segfault with -ftree-vectorize

[bangerth at dealii dot org]

My code segfaults basically immediately when using -ftree-vectorize. 
Preprocessed sources are appended. To reproduce, do this: 
 
spec/src> /home/bangerth/bin/gcc-4.0-pre/bin/c++ -march=pentium4 -O 
-ftree-vectorize x.ii -o x 
spec/src> ./x 
Segmentation fault 
 
This is with mainline CVS as of a few hours ago. 
 
W.

-- 
           Summary: Segfault with -ftree-vectorize
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bangerth at dealii dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2005-01-31 00:41 -------
Created an attachment (id=8109)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8109&action=view)
Preprocessed sources


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[bangerth at dealii dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
 GCC target triplet|                            |i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-01-31 00:45 -------
This might be a dup of bug 17589 which looks more like a glibc bug.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2005-01-31 00:56 -------
Here is a self-contained testcase: 
-------------------------- 
struct A { 
    double values[3]; 
 
    A () { 
      for (unsigned int i=0; i!=3; ++i) 
        values[i] = 0; 
    } 
}; 
 
double f() { 
  A values[3]; 
  return values[0].values[0]; 
} 
 
int main () { 
  return (int)f(); 
} 
------------------------ 
 
spec/src> /home/bangerth/bin/gcc-4.0-pre/bin/c++ -march=pentium4 -O 
-ftree-vectorize x.cc -o x ; ./x 
Segmentation fault 
 
The segfault happens in this line: 
   0x08048400 <_Z1fv+96>:	movapd %xmm0,(%eax) 
Note, however, that as opposed to previous cases, the memory pointed to 
is not allocated through malloc (in which case it was considered a glibc 
bug), nor are we inside main (where it was also considered a system bug 
to not align the stack for main() properly). 
 
W. 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2005-01-31 01:01 -------
BTW, I have glibc 2.3.3, which in the other PR is specifically listed as 
a version for which the bug doesn't happen. So this is not a duplicate. 
 
The system as a whole is suse 9.2, right out of the box. 
 
W. 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-01-31 01:32 -------
Hmm, there is an alignment check there, this seems werid.  Just to check does -fno-ivopt help.  I was 
looking through the asm but I cannot figure out where exactly the problem is.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2005-01-31 03:11 -------
Nope, -fno-ivopts doesn't make any difference. 
W. 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[reichelt at gcc dot gnu dot org]

------- Additional Comments From reichelt at gcc dot gnu dot org  2005-02-10 23:13 -------
Confirmed.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |reichelt at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
           Keywords|                            |monitored
   Last reconfirmed|0000-00-00 00:00:00         |2005-02-10 23:13:22
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[micis at gmx dot de]

------- Additional Comments From micis at gmx dot de  2005-02-23 15:17 -------
I have reported a similar problem bug20122 which may be caused by the same bug.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |micis at gmx dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[micis at gmx dot de]

------- Additional Comments From micis at gmx dot de  2005-05-09 08:24 -------
I cannot reproduce this bug any longer. Maybe the fix for pr20122 also helps 
here.

Michael Cieslinski


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2005-05-31 23:28 -------
I can still reproduce this with today's mainline. The segfault still 
happens in a movapd instruction: 
 
0x08048389 <_Z1fv+21>:  movapd %xmm0,(%eax) 
 
(gdb) info registers eax 
eax            0xbfffe944       -1073747644 
 
This address is not divisible by 16. I am unsure whether this has something 
to do with the stack alignment that always comes up -- here's my glibc 
version: 
 
home/bangerth> /lib/libc.so.6  
GNU C Library stable release version 2.3.4 (20050218), by Roland McGrath et 
al. 
Copyright (C) 2005 Free Software Foundation, Inc. 
 
 
W. 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716

[Bug tree-optimization/19716] Segfault with -ftree-vectorize

[reichelt at gcc dot gnu dot org]

------- Comment #11 from reichelt at gcc dot gnu dot org  2007-07-17 11:05 -------
This got fixed by the patch for PR 25413.


*** This bug has been marked as a duplicate of 25413 ***


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reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19716