AVX
http://software.intel.com/en-us/articles/benefits-of-intel-avx-for-small-matrices/?cid=sw:AVX_Small_Matrices_Blog_JK7
http://www.streamcomputing.eu/blog/2011-02-07/ssex-avx-fma-and-other-extensions-through-opencl
http://www.phoronix.com/scan.php?page=article&item=intel_avx_gcc&num=1