Mining optimization by Chemisist

[lasle2]

Chemisist over on bitcointalk has added an optimization to to latest mining code.

https://github.com/Chemisist/primecoin

I am getting about a 30% boost from it on my core 2 machines and from what people have been saying it's about the same on core i's. Amd FX processors seem to mine slower however, my FX 8120 definitely did.

I would be careful about building his source, he like to make frequent commits without testing. Version bf0ff8fa5593896d800661d288dcfdc7c8a96747 works well.

 Another small optimization I have notices people using is to mine with more threads than processor cores. 1.5-2x threads/cores seems to work well this can be done with "setgenerate true 6" (for 6 threads) in the debugger or "rpcthreads=6" in the config file.

[lasle2]

It also works with amd cpus if the binary is compiled on the amd box with -march=native. I'm getting 2050 pps on the FX 8120 now when running 16 threads.