From: Paul Eggert <eggert@cs.ucla.edu>
To: Robert Pluim <rpluim@gmail.com>, Pip Cet <pipcet@gmail.com>
Cc: 36649@debbugs.gnu.org, larsi@gnus.org,
Andreas Schwab <schwab@linux-m68k.org>,
Stefan Kangas <stefankangas@gmail.com>,
Andrea Corallo <akrl@sdf.org>
Subject: bug#36649: 27.0.50; pure space and pdumper
Date: Thu, 4 Mar 2021 13:52:29 -0800 [thread overview]
Message-ID: <4c1248b8-88cc-ca06-6bc8-9f0bb9a98c98@cs.ucla.edu> (raw)
In-Reply-To: <87sg5bt1bp.fsf@gmail.com>
On 3/4/21 6:56 AM, Robert Pluim wrote:
> Pip> - zero vector handling depends on Qnil being all zero in memory
>
> I think Emacs already assumes Qnil == 0, since there are places that
> use ! to check for Qnil rather than using NILP.
The convention is to put a "verify (NIL_IS_ZERO);" near the rare bits of
code that assume Qnil is all-bits-zero. This is to help out any
hypothetical future developer who wants to change Qnil to be some other
value. Currently there are only two such locations. (There is one other
location that uses NIL_IS_ZERO for an optimization.)
next prev parent reply other threads:[~2021-03-04 21:52 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-14 14:26 bug#36649: 27.0.50; pure space and pdumper Pip Cet
2019-07-21 7:28 ` Paul Eggert
2019-07-21 12:53 ` Pip Cet
2019-07-21 13:44 ` Robert Pluim
2019-07-21 14:36 ` Pip Cet
2019-07-21 15:06 ` Robert Pluim
2019-07-21 17:43 ` Pip Cet
2019-07-21 17:56 ` Robert Pluim
2019-07-21 18:07 ` Pip Cet
2019-07-21 19:12 ` Robert Pluim
2019-07-21 19:35 ` Pip Cet
2019-07-21 20:20 ` Robert Pluim
2019-07-22 3:58 ` Pip Cet
2019-07-22 8:14 ` Robert Pluim
2019-07-22 14:30 ` Eli Zaretskii
2019-07-22 15:46 ` Robert Pluim
2019-07-22 15:03 ` Pip Cet
2019-07-22 18:45 ` Robert Pluim
2020-08-21 12:51 ` Lars Ingebrigtsen
2020-08-21 13:04 ` Pip Cet
2020-08-21 13:47 ` Eli Zaretskii
2020-08-21 15:26 ` Andreas Schwab
2020-08-21 21:41 ` Paul Eggert
2020-08-22 3:51 ` Richard Stallman
2020-08-22 8:55 ` Pip Cet
2020-08-22 9:59 ` Andreas Schwab
2020-08-28 12:32 ` Pip Cet
2020-08-28 14:24 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-11-15 15:19 ` Stefan Kangas
2021-03-03 15:34 ` Pip Cet
2021-03-04 12:55 ` Pip Cet
2021-03-04 14:56 ` Robert Pluim
2021-03-04 15:49 ` Eli Zaretskii
2021-03-04 16:42 ` Robert Pluim
2021-03-04 17:07 ` Eli Zaretskii
2021-03-04 17:18 ` Robert Pluim
2021-03-04 16:53 ` martin rudalics
2021-03-04 17:45 ` Andy Moreton
2021-03-04 21:52 ` Paul Eggert [this message]
2021-03-05 3:00 ` Pip Cet
2021-03-05 7:20 ` Eli Zaretskii
2021-03-14 22:19 ` Stefan Monnier
2021-05-12 14:50 ` Lars Ingebrigtsen
2021-05-12 15:01 ` Eli Zaretskii
2021-05-12 17:03 ` Lars Ingebrigtsen
2021-05-12 17:06 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-12 17:11 ` Lars Ingebrigtsen
2021-05-12 17:28 ` Eli Zaretskii
2021-05-12 17:32 ` Lars Ingebrigtsen
2021-05-12 17:42 ` Eli Zaretskii
2021-05-12 17:58 ` Lars Ingebrigtsen
2021-05-12 18:25 ` Lars Ingebrigtsen
2021-05-12 18:37 ` Eli Zaretskii
2021-05-12 18:48 ` Lars Ingebrigtsen
2021-05-12 18:52 ` Eli Zaretskii
2021-05-12 19:07 ` Lars Ingebrigtsen
2021-05-12 19:12 ` Eli Zaretskii
2021-05-12 19:44 ` Lars Ingebrigtsen
2021-05-13 14:44 ` Pip Cet
2021-05-13 21:23 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-14 6:26 ` Eli Zaretskii
2021-05-14 6:35 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-14 7:07 ` Eli Zaretskii
2021-05-16 13:46 ` Lars Ingebrigtsen
2021-05-13 14:08 ` Eli Zaretskii
2021-05-16 13:38 ` Lars Ingebrigtsen
2021-05-17 8:43 ` Paul Eggert
2021-05-17 10:25 ` Eli Zaretskii
2021-05-17 14:15 ` Lars Ingebrigtsen
2021-05-17 14:23 ` Eli Zaretskii
2021-05-19 15:11 ` Eli Zaretskii
2021-05-19 17:29 ` Paul Eggert
2021-05-19 17:38 ` Eli Zaretskii
2021-05-19 17:43 ` Paul Eggert
2021-05-20 8:46 ` Eli Zaretskii
2021-05-19 18:55 ` Lars Ingebrigtsen
2021-05-17 14:32 ` Andreas Schwab
2021-05-18 13:33 ` Lars Ingebrigtsen
2021-10-20 17:41 ` Stefan Kangas
2021-10-20 18:18 ` Eli Zaretskii
2021-05-17 14:13 ` Lars Ingebrigtsen
2021-05-12 19:12 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-12 18:02 ` Paul Eggert
2021-05-12 17:37 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-12 17:44 ` Eli Zaretskii
2021-05-12 19:07 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-12 19:17 ` Eli Zaretskii
2021-05-12 17:19 ` Eli Zaretskii
2021-05-12 17:10 ` Eli Zaretskii
2021-05-12 17:24 ` Lars Ingebrigtsen
2020-08-22 17:36 ` Paul Eggert
2019-07-21 18:14 ` Eli Zaretskii
2022-07-01 13:46 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-01 15:51 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-01 16:03 ` Eli Zaretskii
2022-07-01 16:33 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-01 18:12 ` Eli Zaretskii
2022-07-01 18:58 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-02 8:55 ` Pip Cet
2022-07-02 9:06 ` Eli Zaretskii
2022-07-02 9:16 ` Lars Ingebrigtsen
2022-07-02 9:22 ` Eli Zaretskii
2022-07-02 10:30 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-02 10:41 ` Eli Zaretskii
2022-07-02 10:51 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-02 12:07 ` Lars Ingebrigtsen
2022-07-02 12:22 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-02 12:41 ` Lars Ingebrigtsen
2022-07-02 12:45 ` Eli Zaretskii
2022-07-02 17:23 ` Lars Ingebrigtsen
2022-07-02 17:31 ` Eli Zaretskii
2022-07-02 16:57 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-02 17:11 ` Eli Zaretskii
2022-07-02 18:03 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-02 18:32 ` Eli Zaretskii
2022-07-02 10:28 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-02 10:32 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-02 10:40 ` Eli Zaretskii
2022-07-02 10:55 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-03 7:14 ` Gerd Möllmann
2022-07-03 7:42 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-03 8:21 ` Gerd Möllmann
2022-07-03 9:38 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-07-03 9:42 ` Gerd Möllmann
2022-07-03 10:01 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
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