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x86-64 log


I've removed the special case for values close to 1.0 from the x86-32
log and logf handling.  I know the logf change is safe, I checked
every value.  But the search space for log is too large.  I looked at
the closest 1 billion values to both sides of 1.0, which are the
critical ones.  Everything checked out.

I think at least on modern hardware everything is safe.  If problems
pop up due to old hardware we might have to conditionalize the
changes.


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