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