cpuminer-opt v3.1 is out. It icludes th enew algo gate and a 5% increase in
performance in all algos.  There is an addtional 10% increase in SSE2 performance.

https://drive.google.com/file/d/0B0lVSGQYLJIZTHdkVG9CSXhObHM/view?usp=sharing