Second Draft "Unsafe fp optimizations" project description.

[dewar@gnat.com]

<<C99 does include a whole appendix that explains the mapping between
IEEE754 and C, which is what we should be trying to conform to in the
default mode on those chips where it is reasonable (probably not x86
or cray).  I believe this appendix is what people mean when they say
"the IEEE-754 model" in the context of C.
>>

Probably, but if we want this to be the reference then the document should
explicitly reference C99. I agree this is a reasonable model, although we
have to be a little careful that the backend is language independent, so we
will have to be careful to understand what is C specific and what is not.