How can I convert my cpp to assembly using SSE

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C++

SSE

assembler

my cpp code is as bellow:

vector<int64_t> negative(vector<int64_t> elems){
   vector<int64_t> results;
   for (auto &elem : elems){
       int64_t temp = 255 - elem > 0 ? 255 - elem : 0 ;
       results.push_back(temp);
   }
    return results;
}

I want to use SSE instead of looping over each element. how can I do that?

What I have tried:

I tried to do as bellow but I still loop over element and couldn't use SSE.

for (int64_t elem : elems)
{
    cout << "first: " << elem << endl;
    asm (
        "sub  $255, %[in1];"
        "neg %[out]"
        : [out] "=r" (elem), [sse] "=x" (elems)
        : [in1] "r" (elem)
    );
    cout << "second: " << elem << endl;
    results.push_back(elem);
}