GNU bug report logs - #5916
XFLOAT_DATA and signed zeroes

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Package: emacs;

Reported by: Vincent Lefevre <vincent <at> vinc17.net>

Date: Fri, 9 Apr 2010 23:54:02 UTC

Severity: normal

Done: Ken Raeburn <raeburn <at> raeburn.org>

Bug is archived. No further changes may be made.

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Message #8 received at 5916 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Vincent Lefevre <vincent <at> vinc17.net>
Cc: 5916 <at> debbugs.gnu.org
Subject: Re: bug#5916: XFLOAT_DATA and signed zeroes
Date: Sat, 10 Apr 2010 11:20:33 -0400

>   lisp.h (XFLOAT_DATA): Produce an rvalue by adding 0 to the value.

> However, adding 0 has another side effect on floats: the 0 is
> converted into +0.0 (due to the addition with a double), so that
> a -0.0 is transformed into a +0.0.

I guess we could/should make this "+0" conditional on some debugging
option, since after all it's only needed to catch coding errors.


        Stefan
This bug report was last modified 15 years and 13 days ago.

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