llvm dev - Dec 2017 - Issues with omp simd

hello,

i am trying to optimize omp simd loop as follows

int main(int argc, char **argv)
{
    const int size = 1000000;


    float a[size], b[size],c[size];



        #pragma omp simd
        for (int i=0; i<size; ++i)
        {
            c[i]= a[i] + b[i];
        }


    return 0;
}

i run it using the following command;

g++ -O0 --std=c++14 -fopenmp-simd lab.cpp  -Iinclude -S -o lab.s

when i compared it with code as follows without simd


int main(int argc, char **argv)
{
    const int size = 1000000;


    float a[size], b[size],c[size];



        for (int i=0; i<size; ++i)
        {
            c[i]= a[i] + b[i];
        }


    return 0;
}

using following command

g++ -O0 --std=c++14  lab.cpp -Iinclude -S -o lab.s

I am getting the same assembly. Why is that so? why not omp simd is more
efficient?

Please help
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