gcc/testsuite/consistency.vlad/layout/f-1-21-31.c

   1 #include <stdio.h>
   2
   3 struct sss{
   4   int i1:1;
   5   int i2:21;
   6   int i3:31;
   7 };
   8
   9 static union u{
  10   struct sss sss;
  11   unsigned char a[sizeof (struct sss)];
  12 } u;
  13
  14 int main (void) {
  15   int i;
  16   for (i = 0; i < sizeof (struct sss); i++)
  17     u.a[i] = 0;
  18   u.sss.i1 = 1.0;
  19   for (i = 0; i < sizeof (struct sss); i++)
  20     printf ("%x ", u.a[i]);
  21   printf ("\n");
  22   u.sss.i2 = 2097151.0;
  23   for (i = 0; i < sizeof (struct sss); i++)
  24     printf ("%x ", u.a[i]);
  25   printf ("\n");
  26   u.sss.i3 = 2147483647.0;
  27   for (i = 0; i < sizeof (struct sss); i++)
  28     printf ("%x ", u.a[i]);
  29   printf ("\n");
  30   return 0;
  31 }