[Bug tree-optimization/70177] New: [6 Regression] ICE in extract_ops_from_tree starting with r233660

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70177

            Bug ID: 70177
           Summary: [6 Regression] ICE in extract_ops_from_tree starting
                    with r233660
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

int c, e, b[128];

void
foo (int i)
{
  int f, g, h;
  for (g = 0; g < 64; g++)
    {
      h = g;
      for (f = 0; f <= i; f++)
        {
          for (; c; e++)
            b[h] = 0;
          h++;
        }
    }
}

at -O2 ICEs starting with r233660.