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Subject: Re: Fixing various bugs in frexp.S
From: "Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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Am Montag, 8. Januar 2018 13:04:52 UTC+1 schrieb Martin Str|mberg:
> "Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com> wrote:
> > The frexp function provided by libc.a has a couple of bugs:
> ...
> >   - for NaN and infinity arguments no sign checks are done thus the
> >     results are always positive
> 
> > All these issues are serious deviations from the ansi/posix behavior.
> 
> An NaN is a NaN. It has no positive or negative value. It has no value at
> all. I seriously doubt ansi/posix says anything about signedness of NaNs.

The goal is not to generate a negative NaN but to preserve the sign of the
imput argument.  The implementation should no convert a -NaN in a +NaN IMO.
This way the implementation bahaves as the implementation on my linux box.

Regards,
Juan M. Guerrero