GNU bug report logs - #22763
25.1.50; Feature Request -- A faster method to obtain line number at position.

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Package: emacs;

Reported by: Keith David Bershatsky <esq <at> lawlist.com>

Date: Mon, 22 Feb 2016 02:44:01 UTC

Severity: wishlist

Tags: fixed

Found in version 25.1.50

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

Full log

Message #51 received at 22763 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 22763 <at> debbugs.gnu.org, esq <at> lawlist.com, monnier <at> iro.umontreal.ca
Subject: Re: bug#22763: 25.1.50; Feature Request -- A faster method to
 obtain line number at position.
Date: Sun, 07 Feb 2021 20:34:56 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> I'll try to whip up a benchmark with really long lines and see what
> happens.

(with-temp-buffer
  (dotimes (_ 10000)
    (insert (make-string (random 4000) ?a) "\n"))
  (benchmark-run 10
    (goto-char (point-min))
    (while (not (eobp))
      (line-number-at-pos (point))
      (forward-line 1))))

With this, the new version still wins...  but only slightly.  So the
cache does indeed help when we've got long lines (which was the point of
the cache, I guess?)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
This bug report was last modified 3 years and 363 days ago.

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