I've commited the fix, including the fast-math related ifdef below. As a
result of the latter, the code is now sligtly slower by default but one
can always use -ffast-math everywhere and recoup that and some more.
I didn't run serious speed or non-regression tests, but it looks like this
option is well worth using.
The differences between nosse and ssecvtt are due, I think, to the usage of a
reciprocal instead of a true division in 1/(1+exp(x)). I suppose this was
found acceptable at the time and would dissappear if everything was compiled
with the -ffast-math flag. Maybe one could use something like
#ifdef __FAST_MATH__
... use reciprocal intrinsic
#else
... use divide intrinsic
#endif
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