.cpp

#include <vector>
#include <iostream>
union sse_float4 {
    float __attribute__ ((vector_size (16))) vector;
    float elements[4];
};

int main() {

    sse_float4 fa;
    fa.elements[0] = 0.0f;
    fa.elements[1] = 1.0f;
    fa.elements[2] = 2.0f;
    fa.elements[3] = 3.0f;

    bool doVector = false;

    if (doVector) {
        for (int i=0; i<1000000000; i++) {

            fa.vector =  fa.vector + fa.vector;
        }
    } else {
        for (int i=0; i<1000000000; i++) {
            fa.elements[0] = fa.elements[0] + fa.elements[0];
            fa.elements[3] = fa.elements[3] + fa.elements[3];
            fa.elements[2] = fa.elements[2] + fa.elements[1];
            fa.elements[1] = fa.elements[1] + fa.elements[1];
        }
    }
}