// u += C[18] * x[18]
		if(x[18] < 0) p = -x[18]; else p = x[18];
		tmp = p >> 2;
		sum = tmp;
		tmp >>= 1;
		sum += tmp;
		if(x[18] < 0){
			u += sum;
		}else{
			u -= sum;
		}

		// u += C[19] * x[19]
		if(x[19] < 0) p = -x[19]; else p = x[19];
		tmp = p >> 2;
		sum = tmp;
		tmp >>= 2;
		sum += tmp;
		tmp >>= 6;
		sum += tmp;
		if(x[19] < 0){
			u += sum;
		}else{
			u -= sum;
		}