1  struct tmp
       2  {
       3    long long int pad : 12;
       4    long long int field : 52;
       5  };
       6  
       7  struct tmp2
       8  {
       9    long long int field : 52;
      10    long long int pad : 12;
      11  };
      12  
      13  struct tmp3
      14  {
      15    long long int pad : 11;
      16    long long int field : 53;
      17  };
      18  
      19  struct tmp4
      20  {
      21    long long int field : 53;
      22    long long int pad : 11;
      23  };
      24  
      25  struct tmp
      26  sub (struct tmp tmp)
      27  {
      28    tmp.field ^= 0x0008765412345678LL;
      29    return tmp;
      30  }
      31  
      32  struct tmp2
      33  sub2 (struct tmp2 tmp2)
      34  {
      35    tmp2.field ^= 0x0008765412345678LL;
      36    return tmp2;
      37  }
      38  
      39  struct tmp3
      40  sub3 (struct tmp3 tmp3)
      41  {
      42    tmp3.field ^= 0x0018765412345678LL;
      43    return tmp3;
      44  }
      45  
      46  struct tmp4
      47  sub4 (struct tmp4 tmp4)
      48  {
      49    tmp4.field ^= 0x0018765412345678LL;
      50    return tmp4;
      51  }
      52  
      53  struct tmp tmp = {0x123, 0x123456789ABCDLL};
      54  struct tmp2 tmp2 = {0x123456789ABCDLL, 0x123};
      55  struct tmp3 tmp3 = {0x123, 0x1FFFF00000000LL};
      56  struct tmp4 tmp4 = {0x1FFFF00000000LL, 0x123};
      57  
      58  main()
      59  {
      60  
      61    if (sizeof (long long) != 8)
      62      exit (0);
      63  
      64    tmp = sub (tmp);
      65    tmp2 = sub2 (tmp2);
      66  
      67    if (tmp.pad != 0x123 || tmp.field != 0xFFF9551175BDFDB5LL)
      68      abort ();
      69    if (tmp2.pad != 0x123 || tmp2.field != 0xFFF9551175BDFDB5LL)
      70      abort ();
      71  
      72    tmp3 = sub3 (tmp3);
      73    tmp4 = sub4 (tmp4);
      74    if (tmp3.pad != 0x123 || tmp3.field != 0xFFF989AB12345678LL)
      75      abort ();
      76    if (tmp4.pad != 0x123 || tmp4.field != 0xFFF989AB12345678LL)
      77      abort ();
      78    exit (0);
      79  }