Need C optimization help

[Mark Rose]

Hmmm. That looks like it. Because I am calculating array offsets by a
runtime value (n_topics). I guess it's time to learn how to code SSE2 by
hand.

I also wanted to tweak the code as much as possible before introducing the
complication of threading. :)

> Perhaps you have hit this bug...
>
>    http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43434
>
> My rough guess if you really care about speed splitting the task into
> multiple processes  on multiple cores will win you way more than
> tweaking this loop.
>
>
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