1  typedef union longlong
       2  {
       3    struct {unsigned short h0, h1, h2, h3;} h;
       4    struct {signed long low, high;} si;
       5    struct {unsigned long low, high;} ui;
       6    signed long long sll;
       7    unsigned long long ull;
       8  } long_long;
       9  
      10  
      11  long long
      12  __negdi2 (u)
      13       long long u;
      14  {
      15    long_long uu;
      16  
      17    uu.sll = u;
      18  
      19    uu.si.low = -uu.si.low;
      20    if (uu.si.low == 0)
      21      uu.si.high = -uu.si.high;
      22    else
      23      uu.si.high = ~uu.si.high;
      24  
      25    return uu.sll;
      26  }