lfpinit() signed or unsigned?

Achim Gratz Stromeko at nexgo.de
Sat Mar 11 07:56:44 UTC 2017


Gary E. Miller writes:
>> There is nothing to normalize in a l_fp  All bit patterns are valid.
>
> Sort of.  The header notes imply the integral and fractional part may be
> signed or unsigned.  Separately.  I have not confirmed if the code use
> that.

No, most certainly not.  What you're looking at really is a simple 64bit
integer type that needs to be scaled by 2^-32 in order to be interpreted
in seconds.  It's not a separate number format or anything like that and
I suspect most of the uses of the integer and fractional half were
initially inserted in order to more effectively deal with that type on
machines with only 32bit arithmetic.  I don't think that's still a valid
concern, but those half-word accesses may be hard to excise from the
code.


Regards,
Achim.
-- 
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