From: no-spam@cua.dk (Kim F. Storm)
Cc: emacs-devel@gnu.org
Subject: Re: bool-vector implementation in the Emacs core
Date: 23 Jan 2004 01:16:04 +0100 [thread overview]
Message-ID: <m3k73jtt8b.fsf@kfs-l.imdomain.dk> (raw)
In-Reply-To: <4nd69dfdn2.fsf@collins.bwh.harvard.edu>
Ted Zlatanov <tzz@lifelogs.com> writes:
>
> We're talking about implementations of ranges in the Gnus developer
> list right now, and our implementations of ranges is written in
> Lisp. I can implement inversion lists in Lisp as well, but ranges
> are such an essential Gnus piece that it seems like seeking core
> support for them would be a good idea.
What kind of C-level support are you looking for?
If you implement inversion lists with lists, I don't really think
lookups or inserts will be significantly faster in C than in
byte-compiled Elisp.
I do think that it would be a good idea to add the bool-vector support
to the emacs lisp core files though, e.g. in subr.el.
What kind of API do you envision?
>
> When dealing with vectors, we can preallocate a fixed number of slots
> at the end of the vector to allow for growth or shrinkage of the
> inversion list. The empty slots can be contain the repetition of
> the last value, or 0 as an out-of-band value. I think a list-based
> implementation is slightly better, though.
IMO, vectors are the wrong tool for this kind of job -- lists are both
faster and more flexible to use for inversion lists.
> I did a search on this topic, but could not find anything. I hope my
> proposal is of interest to people other than Gnus developers (Unicode
> coders, for instance).
It's a good question -- will unicode benefit from this at the C-level?
--
Kim F. Storm <storm@cua.dk> http://www.cua.
next prev parent reply other threads:[~2004-01-23 0:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-21 16:52 bool-vector implementation in the Emacs core Ted Zlatanov
2004-01-21 17:06 ` Paul Jarc
2004-01-21 18:35 ` Ted Zlatanov
2004-01-23 0:16 ` Kim F. Storm [this message]
2004-01-23 0:37 ` Kenichi Handa
2004-01-23 2:19 ` Stefan Monnier
2004-01-23 20:26 ` Ted Zlatanov
2004-01-24 21:40 ` Richard Stallman
2004-01-25 2:59 ` Ted Zlatanov
2004-01-26 19:23 ` Richard Stallman
2004-01-27 1:32 ` Kim F. Storm
2004-01-23 20:18 ` Ted Zlatanov
2004-01-24 2:11 ` Kim F. Storm
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