1  unsigned int foo (unsigned int a, unsigned int b)
       2  {
       3    unsigned i;
       4    a = a & 1;
       5    for (i = 0; i < b; ++i)
       6      a = a << 1 | a >> (sizeof (unsigned int) * 8 - 1);
       7    return a;
       8  }
       9  extern void abort (void);
      10  int main()
      11  {
      12    if (foo (1, sizeof (unsigned int) * 8 + 1) != 2)
      13      abort ();
      14    return 0;
      15  }