Re: GCL Version_2_6_13pre125

[Camm Maguire]

Greetings, and thanks for the feedback!  Indeed, we just forward the C
code result here.  The '-' sign has recently appeared in newer gcc.
Unlike the case with negative zero, which does denote a lisp number,
+-inf/nan have no lisp counterpart, so it seems best just to follow ieee
here.  Compliant lisp code should not depend on the printed
representation, as far as I understand.  This is why we only print these
when the special variable si::*print-nans* is set to non-nil. 

Take care,

James Cloos <cloos@jhcloos.com> writes:

>>>>>> "RD" == Robert Dodier <robert.dodier@gmail.com> writes:
>
>>> >(setq b (- a) c (- a a))
>>> #<-nan>
>
> RD> Minor wart here -- should be #<nan>, NaN doesn't have a sign.
>
> they do at the hw level (per ieee754).
>
> other langs support signed nans.  i presume gcl must be passing thru
> what the c code returns.
>
> -JimC

-- 
Camm Maguire                                        camm@maguirefamily.org
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"The earth is but one country, and mankind its citizens."  --  Baha'u'llah