GNU bug report logs - #16526
24.3.50; scroll-conservatively & c-mode regression

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Packages: cc-mode, emacs;

Reported by: martin rudalics <rudalics <at> gmx.at>

Date: Thu, 23 Jan 2014 08:54:02 UTC

Severity: important

Found in version 24.3.50

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Alan Mackenzie <acm <at> muc.de>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 16526-done <at> debbugs.gnu.org
Subject: bug#16526: 24.3.50; scroll-conservatively & c-mode regression
Date: Wed, 25 Jun 2014 22:51:24 -0400

> How can this one single scan-lists called from CC Mode be so slow, yet
> the identical call from the minibuffer be 50 times as fast?

Do the two return the same position?  The time taken by scan-lists is
proportional to the "distance", so a 50x slowdown would not be
surprising if it goes 50x further.

> My understanding is that scan-lists is a primitive operation,
> unaffected by virtually any context (apart from specific things like
> parse-sexp-ignore-comments and syntax-table text properties which are
> meant to affect it).

Another influence could be parse-sexp-lookup-properties, tho it
definitely shouldn't account for more than a few percents.


        Stefan
This bug report was last modified 11 years and 16 days ago.

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