gcc/testsuite/gcc.c-torture/execute/921204-1.c

   1 /* The bit-field below would have a problem if __INT_MAX__ is too
   2    small.  */
   3 void abort (void);
   4 void exit (int);
   5
   6 #if __INT_MAX__ < 2147483647
   7 int
   8 main (void)
   9 {
  10   exit (0);
  11 }
  12 #else
  13 typedef struct {
  14   unsigned b0:1, f1:17, b18:1, b19:1, b20:1, f2:11;
  15 } bf;
  16
  17 typedef union {
  18   bf b;
  19   unsigned w;
  20 } bu;
  21
  22 bu
  23 f(bu i)
  24 {
  25   bu o = i;
  26
  27   if (o.b.b0)
  28     o.b.b18 = 1,
  29     o.b.b20 = 1;
  30   else
  31     o.b.b18 = 0,
  32     o.b.b20 = 0;
  33
  34   return o;
  35 }
  36
  37 int
  38 main(void)
  39 {
  40   bu a;
  41   bu r;
  42
  43   a.w = 0x4000000;
  44   a.b.b0 = 0;
  45   r = f(a);
  46   if (a.w != r.w)
  47     abort();
  48   exit(0);
  49 }
  50 #endif