Re: 4 hashes parallel on SSE2 CPUs for 0.3.6

If you haven't already, try aligning thash.  It might matter.  Couldn't hurt.

Looks like we're triggering a compiler bug in the tree optimizer. Can you try to compile it -O0?
No help from -O0, same error.

MinGW is GCC 3.4.5.  Probably the problem.

I'll see if I can get a newer version of MinGW.