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From: Matt Armstrong <matt@rfc20.org>
To: "Gerd Möllmann" <gerd.moellmann@gmail.com>,
	"Stefan Monnier" <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: noverlay branch
Date: Thu, 06 Oct 2022 21:11:01 -0700	[thread overview]
Message-ID: <87edvki88a.fsf@rfc20.org> (raw)
In-Reply-To: <af4a1ba8-b674-6bac-c440-77560f0748f9@gmail.com>

Gerd Möllmann <gerd.moellmann@gmail.com> writes:

> On 22-10-06 6:47 , Matt Armstrong wrote:
>
>> I see you removed some of the null->parent trick just today.  I like
>> that idea.  It is realtively easy to use actual NULL instead of a
>> sentinel NULL in tree algorithms, and I think on modern processors this
>> works out for the better.
>
> Clang libstd++ uses NULL, BTW, and I already wondered a little bit why.

I believe GNU libstdc++ does not use sentinel nodes either.  I have yet
to see see sentinel nodes used in an optimized tree implementation.

I think in the context of this overlay work the performance difference
is not very significant, since the code is doing a lot of other stuff
while traversing the tree.



  reply	other threads:[~2022-10-07  4:11 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-25 22:38 noverlay branch Stefan Monnier
2022-09-25 22:50 ` Lars Ingebrigtsen
2022-09-25 22:56   ` Stefan Monnier
2022-09-26  2:52 ` Ihor Radchenko
2022-09-26  3:17   ` Stefan Monnier
2022-09-26  6:11   ` Eli Zaretskii
2022-09-26 13:08     ` Ihor Radchenko
2022-09-26 15:59       ` Eli Zaretskii
     [not found]         ` <87v8ovdosz.fsf@localhost>
2022-10-08  6:57           ` Eli Zaretskii
2022-10-09  3:25             ` Matt Armstrong
2022-10-09  4:30               ` Eli Zaretskii
2022-10-09  3:23           ` Matt Armstrong
2022-10-09  3:47           ` Stefan Monnier
2022-10-13 12:09             ` Ihor Radchenko
2022-09-29 18:12       ` Stefan Monnier
2022-09-27  5:12 ` Matt Armstrong
2022-09-27  6:53   ` Eli Zaretskii
2022-09-27 17:31     ` Matt Armstrong
2022-09-27 18:45       ` Stefan Monnier
2022-09-28 23:09   ` Stefan Monnier
2022-09-29 14:54     ` Gerd Möllmann
2022-09-29 21:36       ` Stefan Monnier
2022-09-30  5:20         ` Gerd Möllmann
2022-10-06  4:47         ` Matt Armstrong
2022-10-06  5:43           ` Gerd Möllmann
2022-10-07  4:11             ` Matt Armstrong [this message]
2022-10-07  4:34               ` Gerd Möllmann
2022-10-07 13:33                 ` Stefan Monnier
2022-10-07 14:29                   ` Gerd Möllmann
2022-10-07 14:51                     ` Stefan Monnier
2022-10-07 15:12                       ` Gerd Möllmann
2022-10-07 17:12                         ` Stefan Monnier
2022-10-07 14:56                   ` Stefan Monnier
2022-10-07 15:59                   ` Matt Armstrong
2022-10-07 15:34                 ` Matt Armstrong
2022-10-06 12:08           ` Stefan Monnier
2022-09-27  8:39 ` Gerd Möllmann
2022-09-27  9:38   ` Eli Zaretskii
2022-10-06 20:41 ` Matt Armstrong
2022-10-07 16:51 ` Matt Armstrong
2022-10-07 18:28   ` Stefan Monnier
2022-10-08 23:33     ` Matt Armstrong
2022-10-09  3:44       ` Matt Armstrong
2022-10-09  4:12       ` Stefan Monnier
2022-10-09 15:34         ` Stefan Monnier
2022-10-10  2:57           ` Matt Armstrong
2022-10-10  6:24             ` Eli Zaretskii
2022-10-10 16:26               ` Matt Armstrong
2022-10-10 14:44             ` Stefan Monnier
2022-10-11  3:46               ` Matt Armstrong
2022-10-11  4:09                 ` Stefan Monnier
2022-10-11 18:02                   ` Matt Armstrong
2022-10-11 18:59                     ` Stefan Monnier
2022-10-12  5:18                       ` Matt Armstrong
2022-10-12 18:02                         ` Stefan Monnier
2022-10-12 22:26                           ` Matt Armstrong
2022-10-13  4:03                             ` Stefan Monnier
2022-10-09 23:47       ` Stefan Monnier
2022-10-10  0:05         ` Emanuel Berg
2022-10-10 16:27           ` Matt Armstrong
2022-10-10 16:33         ` Matt Armstrong
2022-10-10 18:32           ` Matt Armstrong
2022-10-11 16:06             ` Stefan Monnier
2022-10-12 17:33               ` Matt Armstrong
2022-10-13  3:59                 ` Stefan Monnier
2022-10-16 21:53                   ` Matt Armstrong
2022-10-23  4:49 ` Matt Armstrong
2022-10-24  9:14   ` Stefan Kangas
2022-10-24 16:21     ` Matt Armstrong
2022-10-24 12:51   ` Eli Zaretskii
2022-10-25 20:57     ` Dmitry Gutov

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