GNU bug report logs - #42147
28.0.50; pure vs side-effect-free, missing optimizations?

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Package: emacs;

Reported by: Andrea Corallo <andrea_corallo <at> yahoo.it>

Date: Tue, 30 Jun 2020 22:28:02 UTC

Severity: normal

Found in version 28.0.50

Done: Mattias Engdegård <mattiase <at> acm.org>

Bug is archived. No further changes may be made.

Full log

Message #220 received at 42147-done <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <akrl <at> sdf.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Mattias Engdegård <mattiase <at> acm.org>,
 Paul Eggert <eggert <at> cs.ucla.edu>, Andrea Corallo <andrea_corallo <at> yahoo.it>,
 42147-done <at> debbugs.gnu.org
Subject: Re: bug#42147: 28.0.50;
 pure vs side-effect-free, missing optimizations?
Date: Thu, 09 Jul 2020 12:57:15 +0000

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> String mutation is something of a special case: it is rare, yet its mere
>> possibility incurs costs even for code that doesn't use it.
>
> Yes and no: it's *very* rare to change the sequence of characters which
> compose a string, yes, but until the addition of `propertize` (in
> Emacs-21) mutation was the only way to add text-properties to a string,
> so it's still quite common.

Hi Stefan,

What's your suggestion on this optimization? Do you think can be on with
default settings or is it dangerous?

  Andrea

-- 
akrl <at> sdf.org
This bug report was last modified 4 years and 282 days ago.

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