[Bug rtl-optimization/48549] New: [4.6/4.7 Regression] Combiner ICE with -g

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48549

           Summary: [4.6/4.7 Regression] Combiner ICE with -g
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: jakub@gcc.gnu.org
        ReportedBy: jakub@gcc.gnu.org


void
foo (void *from, void *to)
{
  long offset = reinterpret_cast <long>(to) - reinterpret_cast <long>(from);
  if (offset != static_cast <int>(offset))
    *(int *) 0xC0DE = 0;
  reinterpret_cast <int *>(from)[1] = offset;
}
struct A
{
  A () : a () {}
  A (void *x) : a (x) {}
  void *bar () { return a; }
  void *a;
};
struct C;
struct D;
struct E : public A
{
  C m1 (int);
  D m2 ();
  E () {}
  E (A x) : A (x) {}
};
struct C : public E
{
  C () {}
  C (void *x) : E (x) {}
};
struct D : public E
{
  D (void *x) : E (x) {}
};
C
E::m1 (int x)
{
  return (reinterpret_cast <char *>(bar ()) + x);
}
D
E::m2 ()
{
  return reinterpret_cast <char *>(bar ());
}
struct B
{
  E a;
  unsigned b : 16;
  unsigned c : 1;
};
void
baz (B *x)
{
  for (unsigned i = 0; i < 64; i++)
    {
      D d = x[i].a.m2 ();
      C c = x[i].a.m1 (x[i].c);
      foo (d.bar (), c.bar ());
    }
}

ICEs with -g -O2 on x86_64-linux, starting with 172109/172110.