gcc/testsuite/gcc.dg/20050603-2.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2" } */
   3 #include <stdlib.h>
   4 struct s {
   5   unsigned short f: 16;
   6   unsigned short y: 8;
   7   unsigned short g: 2;
   8   unsigned int x;
   9 };
  10
  11 void set (struct s*, int) __attribute__((noinline));
  12 void set (struct s* p, int flags) {
  13   p->g = flags << 1;
  14 }
  15 main() {
  16   struct s foo = {0 , 0, 3, 0};
  17   set (&foo, -1);
  18   if (foo.g != 2)
  19     abort();
  20   return 0;
  21 }