1  static int Sub(int a, int b) {
       2    return  b -a;
       3  }
       4  
       5  static unsigned Select(unsigned a, unsigned b, unsigned c) {
       6    const int pa_minus_pb =
       7        Sub((a >>  8) & 0xff, (b >>  8) & 0xff) + 
       8        Sub((a >>  0) & 0xff, (b >>  0) & 0xff); 
       9    return (pa_minus_pb <= 0) ? a : b;
      10  }
      11  
      12  __attribute__((noinline)) unsigned Predictor(unsigned left, const unsigned* const top) {
      13    const unsigned pred = Select(top[1], left, top[0]);
      14    return pred;
      15  }
      16  
      17  int main(void) {
      18    const unsigned top[2] = {0xff7a7a7a, 0xff7a7a7a};
      19    const unsigned left = 0xff7b7b7b;
      20    const unsigned pred = Predictor(left, top /*+ 1*/);
      21    if (pred == left)
      22      return 0;
      23    return 1;
      24  }
      25  
      26  
      27