1  #include <stdio.h>
       2  #include <stdlib.h>
       3  
       4  typedef struct {
       5    unsigned short a;
       6    unsigned short b;
       7  } foo_t;
       8  
       9  void a1 (unsigned long offset) {}
      10  
      11  volatile foo_t *
      12  f ()
      13  {
      14    volatile foo_t *foo_p = (volatile foo_t *)malloc (sizeof (foo_t));
      15  
      16    a1((unsigned long)foo_p-30);
      17    if (foo_p->a & 0xf000)
      18      printf("%d\n", foo_p->a);
      19    foo_p->b = 0x0100;
      20    a1 ((unsigned long)foo_p + 2);
      21    a1 ((unsigned long)foo_p - 30);
      22    return foo_p;
      23  }
      24  
      25  main ()
      26  {
      27    volatile foo_t *foo_p;
      28  
      29    foo_p = f ();
      30    if (foo_p->b != 0x0100)
      31      abort ();
      32    exit (0);
      33  }