921103-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

struct {
  unsigned int f1, f2;
} s;

f()
{
 unsigned x, y;
 x = y = 0;
 while (y % 4)
   y++;
 g(&s.f2, s.f1 + x, 4);
}