check_cxx_source_runs("
        #include <xmmintrin.h>
        int main ()
        {
            volatile __m128 a, b;
            float vals[4] = {0};
            a = _mm_loadu_ps (vals);
            b = a;
            b = _mm_add_ps (a,b);
            _mm_storeu_ps (vals,b);
            return (0);
        }"
            HAVE_SSE_EXTENSIONS)

elseif(HAVE_SSE_EXTENSIONS)