Вычислить значение функции

#include "stdafx.h"
#include <iostream>
#include <vector>
#include <pmmintrin.h>
 
 
int main()
{
    std::vector <double> x {1., 2., 3., 4., 5.,6.,7.,8.,9.,10.};
    std::vector <double> a { 11., 12., 13., 14., 15., 16., 17., 18., 19., 20. };
    double Z;
    __m128d mass_x, mass_a, mass_z;
    __m128d mass_Summ = _mm_setzero_pd();
    __m128d mass_two = _mm_set_pd(2.0, 2.0);
 
    for (int i = 0; i < 10; i += 2)
    {
        mass_x = _mm_load_pd(&x[i]);
        mass_a = _mm_load_pd(&a[i]);
        mass_z = _mm_add_pd(mass_x, mass_a);
        mass_z = _mm_div_pd(mass_z, mass_two);
        mass_z = _mm_sqrt_pd(mass_z);
        mass_Summ = _mm_add_pd(mass_Summ, mass_z);
    }
    mass_Summ = _mm_hadd_pd(mass_Summ, mass_Summ);
    _mm_store_sd(&Z, mass_Summ);
 
    std::cout << " Z = " << Z << std::endl;
    system("pause");
    return 0;
}

#include "stdafx.h"
#include <iostream>
#include <valarray>
 
int main()
{
    std::valarray <double> x{ 1., 2., 3., 4., 5.,6.,7.,8.,9.,10. };
    std::valarray <double> a{ 11., 12., 13., 14., 15., 16., 17., 18., 19., 20. };
    
    double Z;
    std::valarray <double> Summ(x + a);
    Summ = Summ / 2.;
    Summ = sqrt(Summ);
    Z = Summ.sum ();
 
    std::cout << " Z = " << Z << std::endl;
    system("pause");
    return 0;
}