3.54
int decode2(int x, int y, int x)
{
  int t1 = z - y;
  int t2 = x ^ t1;
  int t3 = (t1 << 15) >> 15;
  int t4 = t3 * t2;

  return t4;
}

3.56
int loop(int x, int n)
{
  int result = 0x55555555;
  unsigned mask;
  for(mask = 0x80000000; mask != 0; mask = mask >> n) {
    result ^= (x & mask);
  }
  return result;
}