[Bug tree-optimization/101186] predictable comparison of integer variables not folded

[aldyh at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101186

--- Comment #5 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Sorry for the slightly different IL.  I had altered g() to avoid depending on
stdio.h:

void g (int a, int b, int x, int y)
{
  int c = y;
  if (a != 0)
    c = x;
  while (b < 1000)
  // without this loop, jump thread & VRP can remove dead code
    {
      if (a != 0)
        {
          if (c > x)
            unreachable();
        }
      else
        blah();
      b++;
    }
}