[Bug tree-optimization/70177] [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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Perhaps better testcase (-O2 again):

int b[128];

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

This one is well defined if ((j <= 0 && i <= INT_MAX - 63) || i <= 64) and
numbers of loop iterations are 64, min (i >= 0 ? i + 1 : 0, INT_MAX - 62), max
(j, 0).