1  extern void abort (void);
       2  
       3  typedef union i386_operand_type
       4  {
       5    struct
       6      {
       7        unsigned int reg8:1;
       8        unsigned int reg16:1;
       9        unsigned int reg32:1;
      10        unsigned int reg64:1;
      11        unsigned int floatreg:1;
      12        unsigned int regmmx:1;
      13        unsigned int regxmm:1;
      14        unsigned int regymm:1;
      15        unsigned int control:1;
      16        unsigned int debug:1;
      17        unsigned int test:1;
      18        unsigned int sreg2:1;
      19        unsigned int sreg3:1;
      20        unsigned int imm1:1;
      21        unsigned int imm8:1;
      22        unsigned int imm8s:1;
      23        unsigned int imm16:1;
      24        unsigned int imm32:1;
      25        unsigned int imm32s:1;
      26        unsigned int imm64:1;
      27        unsigned int disp8:1;
      28        unsigned int disp16:1;
      29        unsigned int disp32:1;
      30        unsigned int disp32s:1;
      31        unsigned int disp64:1;
      32        unsigned int acc:1;
      33        unsigned int floatacc:1;
      34        unsigned int baseindex:1;
      35        unsigned int inoutportreg:1;
      36        unsigned int shiftcount:1;
      37        unsigned int jumpabsolute:1;
      38        unsigned int esseg:1;
      39        unsigned int regmem:1;
      40        unsigned int mem:1;
      41        unsigned int byte:1;
      42        unsigned int word:1;
      43        unsigned int dword:1;
      44        unsigned int fword:1;
      45        unsigned int qword:1;
      46        unsigned int tbyte:1;
      47        unsigned int xmmword:1;
      48        unsigned int ymmword:1;
      49        unsigned int unspecified:1;
      50        unsigned int anysize:1;
      51      } bitfield;
      52    unsigned int array[2];
      53  } i386_operand_type;
      54  
      55  unsigned int x00, x01, y00, y01;
      56  
      57  int main (int argc, char *argv[])
      58  {
      59    i386_operand_type a,b,c,d;
      60  
      61    a.bitfield.reg16 = 1;
      62    a.bitfield.imm16 = 0;
      63    a.array[1] = 22;
      64  
      65    b = a;
      66    x00 = b.array[0];
      67    x01 = b.array[1];
      68  
      69    c = b;
      70    y00 = c.array[0];
      71    y01 = c.array[1];
      72  
      73    d = c;
      74    if (d.bitfield.reg16 != 1)
      75      abort();
      76    if (d.bitfield.imm16 != 0)
      77      abort();
      78    if (d.array[1] != 22)
      79      abort();
      80  
      81    return 0;
      82  }