about float & double

[spir]

Hello,


Is there somewhere a (clear) doc about float/double internals?
Some more particuliar questions:

What is the internal bit layout? (mantissa, sign, exponent)

Can I assume the "integral range" is [-2^(m-1) .. 2^⁽m-1)-1], where m is 
the number of mantissa bits?

What are the values used to represent thingies like NaNs, inf, error? 
(Or are there not represented as values?)

How would you get a float's integral and fractional parts without 
performing arithmetic? (I think at bit ops, indeed)


Denis
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