* _mm_loaddup_pd is slow * optimize SSE ei_ploaddup<Packet4f>
* _mm_loaddup_pd is slow
* optimize SSE ei_ploaddup<Packet4f>

mjbshaw/Eigen,madlib/eigen_backup,rotorliu/eigen,mjbshaw/Eigen,rotorliu/eigen,mjbshaw/Eigen,rotorliu/eigen,rotorliu/eigen,madlib/eigen_backup,madlib/eigen_backup,mjbshaw/Eigen,madlib/eigen_backup