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

bangerth at dealii dot org gcc-bugzilla@gcc.gnu.org
Mon Jan 31 00:56:00 GMT 2005

------- 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). 



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