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.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 22763 <at> debbugs.gnu.org, esq <at> lawlist.com, monnier <at> iro.umontreal.ca
Subject: bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position.
Date: Sun, 07 Feb 2021 21:43:59 +0200

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: 22763 <at> debbugs.gnu.org,  esq <at> lawlist.com,  monnier <at> iro.umontreal.ca
> Date: Sun, 07 Feb 2021 20:34:56 +0100
> 
> (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?)

Yes.
This bug report was last modified 3 years and 364 days ago.

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