1  /* { dg-do compile } */
       2  /* { dg-options "-O -fstrict-aliasing -fdump-tree-optimized" } */
       3  
       4  struct A {
       5    int i;
       6    int j;
       7  };
       8  struct B {
       9    struct A a1;
      10    struct A a2;
      11  };
      12  struct C {
      13    struct A a1;
      14    struct B b;
      15  };
      16  int foo(struct C *c, struct B *b)
      17  {
      18    c->a1.i = 1;
      19    b->a1.i = 0;
      20    return c->a1.i;
      21  }
      22  
      23  /* { dg-final { scan-tree-dump "return 1;" "optimized" } } */