[f-cpu] IEEE FP exceptions

[devik <devik@cdi.cz>]

FYI (for nicO especially):

While I was thinking whether FP precise traps are needed,
I found article
http://cch.loria.fr/documentation/IEEE754/ACM/hauser.pdf
which describes pros and cons. He concludes that exceptions
are not so needed (they are optional feature of standard)
if you implement FPU status flags. There are better supported
by languages and math librararies.
For CPU designer it could mean possibility of impresise
exceptions use because getfpflags() should act as FP instruction
fence...

devik

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