From: "Rüdiger Sonderfeld" <ruediger@c-plusplus.de>
To: emacs-devel@gnu.org
Cc: Leo Liu <sdl.web@gmail.com>
Subject: Re: why is reverse a string in-place so much slower than a vector?
Date: Fri, 25 Apr 2014 10:55:59 +0200 [thread overview]
Message-ID: <3673186.oJyHOS7TOs@descartes> (raw)
In-Reply-To: <m338h1n7q1.fsf@gmail.com>
On Friday 25 April 2014 16:17:42 Leo Liu wrote:
> So why is this so much slower on string?
This is a bit of a guess. But I think the problem is that `aref' has to do
more complicated operations for multi-byte strings to correctly decode them.
While for a vector it can simply access every single bytes.
(with-current-buffer "subr.el" (multibyte-string-p (buffer-substring (point-
min) (point-max))))
-> t
Regards,
Rüdiger
next prev parent reply other threads:[~2014-04-25 8:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-25 8:12 why is reverse a string in-place so much slower than a vector? Leo Liu
2014-04-25 8:17 ` Leo Liu
2014-04-25 8:55 ` Rüdiger Sonderfeld [this message]
2014-04-25 9:14 ` Andreas Schwab
2014-04-25 9:35 ` Leo Liu
2014-04-25 11:00 ` Andreas Schwab
2014-04-26 0:19 ` Leo Liu
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