From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Drew Adams <drew.adams@oracle.com>
Cc: 15294@debbugs.gnu.org, Dmitry Gutov <dgutov@yandex.ru>
Subject: bug#15294: 24.3.50; js2-mode parser is several times slower in lexical-binding mode
Date: Fri, 13 Sep 2013 09:01:03 -0400 [thread overview]
Message-ID: <jwvioy4ri4a.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <1b2ab855-2c0d-4fdb-963b-6782f91fb2e2@default> (Drew Adams's message of "Thu, 12 Sep 2013 22:45:21 -0700 (PDT)")
>> What people should know is that
>>
>> (let (x y z)
>> ...(setq x ...)
>> ...(setq z ...)
>> ...(setq y ...)
>>
>> is often a bad idea in Elisp, and even more so in lexical-binding code
>> (in some cases, if a variable is immutable it can be handled
>> significantly more efficiently, so the mere existence of a single `setq'
>> on a variable can sometimes slow other chunks of code: in many cases
>> `let' is cheaper than `setq').
> Thank you for both answers. Will the second apply even after making the
> byte-compiler improvements described for the first? (I'm guessing yes.)
> If so, you might want to mention this guideline in the manual.
Yes.
Stefan
next prev parent reply other threads:[~2013-09-13 13:01 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-06 20:59 bug#15294: 24.3.50; js2-mode parser is several times slower in lexical-binding mode Dmitry Gutov
2013-09-06 23:44 ` Xue Fuqiao
2013-09-07 3:15 ` Stefan Monnier
2013-09-08 22:32 ` Stefan Monnier
2013-09-10 2:04 ` Stefan Monnier
2013-09-13 3:40 ` Stefan Monnier
2013-09-13 3:59 ` Drew Adams
2013-09-13 4:37 ` Stefan Monnier
2013-09-13 5:45 ` Drew Adams
2013-09-13 13:01 ` Stefan Monnier [this message]
2013-09-14 0:09 ` Lexical let and setq Michael Welsh Duggan
2013-09-14 3:46 ` Stefan Monnier
2013-09-14 11:13 ` Lars Magne Ingebrigtsen
2013-09-14 14:04 ` Pascal J. Bourguignon
2013-09-15 5:11 ` Stefan Monnier
2013-09-14 21:47 ` Richard Stallman
2013-09-15 5:09 ` Stefan Monnier
2013-09-15 16:54 ` Richard Stallman
2013-09-15 17:06 ` Stefan Monnier
2013-09-16 10:47 ` Richard Stallman
2013-09-14 4:20 ` bug#15294: 24.3.50; js2-mode parser is several times slower in lexical-binding mode Dmitry Gutov
2013-09-14 14:27 ` Stefan Monnier
2013-09-15 0:11 ` Dmitry Gutov
2013-09-15 5:04 ` Stefan Monnier
2013-09-15 16:54 ` Richard Stallman
2013-09-15 0:24 ` Dmitry Gutov
2013-09-15 5:06 ` Stefan Monnier
2013-09-18 23:48 ` Stefan Monnier
2013-09-22 4:56 ` Dmitry Gutov
2013-10-03 5:00 ` Stefan Monnier
2013-10-04 2:38 ` Dmitry Gutov
2013-10-04 13:52 ` Stefan Monnier
2013-10-05 3:27 ` Dmitry Gutov
2014-12-14 12:31 ` Dmitry Gutov
2014-12-14 14:08 ` Stefan Monnier
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