cmake HAVE_SSE3_EXTENSIONS examples

soedinglab/hh-suite cmake/CheckSSEFeatures.cmake :60 

check_cxx_source_runs("
        #include <pmmintrin.h>
        int main ()
        {
            volatile __m128d a, b;
            double vals[2] = {0};
            a = _mm_loadu_pd (vals);
            b = _mm_hadd_pd (a,a);
            _mm_storeu_pd (vals, b);
            return (0);
        }"
            HAVE_SSE3_EXTENSIONS)

soedinglab/hh-suite cmake/CheckSSEFeatures.cmake :118 

elseif(HAVE_SSE3_EXTENSIONS)