Makefile doesn't trigger -O3

[deisenstein]

We want to pass along that the Makefile doesn't currently use the FLAGS, so that the out-of-the-box compiling doesn't invoke -O3 (or any optimization). Turning that on sped up the 16-way code by a factor of 4 and got us up to the speed on your web page.

Thanks for making this code available! It works nicely and was easy to read.

[stbrumme]

Thanks for pointing that out.
A new Makefile was checked in.