1  /* PRs target/15569, rtl-optimization/15681 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-Os -frename-registers" } */
       4  /* { dg-options "-mconstant-gp -Os -frename-registers" { target ia64-*-* } } */
       5  
       6  struct S { struct S *a, *b; };
       7  struct T { struct S e; unsigned long a; int b, c; void *d; } f;
       8  
       9  unsigned long f1 (unsigned long);
      10  void f2 (int, struct T *);
      11  void *f3 (void *);
      12  unsigned long volatile g;
      13  
      14  static void
      15  f4 (struct T *p)
      16  {
      17    f1 (f1 (((unsigned long) g - p->a) >> 20));
      18  }
      19  
      20  static struct T *
      21  f5 (void)
      22  {
      23    struct T *g, *p;
      24    struct T *q = 0;
      25    for (g = p = &f; (g = p = (struct T *) (g->e.a)) != &f;)
      26      if (p->b)
      27        {
      28  	f4 (p);
      29  	if (p->c & 0x80000)
      30  	  return p;
      31        }
      32    return q;
      33  }
      34  
      35  static void
      36  f6 (struct T *p)
      37  {
      38    f2 (9, p);
      39  }
      40  
      41  static inline void *
      42  f7 (struct T *t)
      43  {
      44    void *d;
      45    d = t->d;
      46    if (d)
      47      d = f3 (d);
      48    return d;
      49  }
      50  
      51  static void *
      52  f8 (struct T *p)
      53  {
      54    void *d = f7 (p);
      55    if (!d)
      56      return 0;
      57    f6 (p);
      58    return d;
      59  }
      60  
      61  static void
      62  f9 (void)
      63  {
      64    struct T *p;
      65    p = f5 ();
      66    f8 (p);
      67  }
      68  
      69  void
      70  test (void)
      71  {
      72    f9 ();
      73  }