how to parallel this for loop? -

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i trying learn openmp , trying run second loop in parallel adding "#pragma omp parallel for",but not working suggestions?

  if (hi - lo > 3) {       ( = hi-4; >= lo; i-- ) {          tmp = fmap[i];          ec_tmp = eclass[tmp];          #pragma omp parallel          ( j = i+4; j <= hi && ec_tmp > eclass[fmap[j]]; j += 4 )             fmap[j-4] = fmap[j];          fmap[j-4] = tmp;       }    }


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