1  /* builtin_return_address(n) with n>0 has always been troublesome ...
       2     especially when the S/390 packed stack layout comes into play.  */
       3  
       4  /* { dg-do run } */
       5  /* { dg-options "-O3 -fno-optimize-sibling-calls -mbackchain -mpacked-stack -msoft-float" } */
       6  
       7  void *addr1;
       8  
       9  extern void abort (void);
      10  
      11  void * __attribute__((noinline))
      12  foo1 ()
      13  {
      14    addr1 = __builtin_return_address (2);
      15  }
      16  
      17  void * __attribute__((noinline))
      18  foo2 ()
      19  {
      20    foo1 ();
      21  }
      22  
      23  void * __attribute__((noinline))
      24  foo3 ()
      25  {
      26    foo2 ();
      27  }
      28  
      29  void __attribute__((noinline))
      30  bar ()
      31  {
      32    void *addr2;
      33  
      34    foo3 ();
      35    asm volatile ("basr  %0,0\n\t" : "=d" (addr2));
      36    /* basr is two bytes in length.  */
      37    if (addr2 - addr1 != 2)
      38      abort ();
      39  }
      40  
      41  int
      42  main ()
      43  {
      44    bar();
      45    return 0;
      46  }