Draft "Unsafe fp optimizations" project description.

[dewar@gnat.com]

<<It all depends on what you mean by "now".  -ffast-math (no c :-) enables
underflow-to-zero on ia64 and alpha.  On my alpha (I've never even seen
a ia64 workstation, but they seem to exist), forcing the processor to
treat underflow-as-zero meant an 1.8 times speed up on our Numerical
Weather Forecasting system.
>>

Sure but that is exatly the case we know is highly significant on this
processor, what is interesting is to know if *any* of the other transformations
have any effect at all.

For my taste I would have underflow-to-zero be the default on alpha, and
only use the very expensive denormal stuff if -mieee is set.