From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: tomas@tuxteam.de
Cc: David Kastrup <dak@gnu.org>, emacs-devel@gnu.org
Subject: Re: [PATCH] use tail pointer for LOOP
Date: Thu, 17 Jun 2010 16:48:43 -0400 [thread overview]
Message-ID: <jwvpqzpcrqe.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <20100617051021.GA26623@tomas> (tomas@tuxteam.de's message of "Thu, 17 Jun 2010 07:10:21 +0200")
> Reverse: (1.006534 3 0.682734)
> Tail pointer: (1.305476 4 0.9159619999999986)
> Still, reversing seems to be worth it (by some 30 percent). Unless we
> find some way to streamline the tail pointer better.
That's really not surprising: count the number of function calls and
you'll see that the nreverse way is likely to win every time, simply
because it suffers about half as much from the interpretation overhead.
Stefan
next prev parent reply other threads:[~2010-06-17 20:48 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-29 21:56 O(N^2) behavior in LOOP Daniel Colascione
2010-05-29 22:06 ` Daniel Colascione
2010-05-29 22:14 ` Lennart Borgman
2010-05-29 22:35 ` Geoff Gole
2010-05-29 23:58 ` [PATCH] use tail pointer for LOOP (Was: Re: O(N^2) behavior in LOOP) Daniel Colascione
2010-05-30 0:45 ` Ken Raeburn
2010-05-30 0:49 ` Daniel Colascione
2010-06-16 17:44 ` tomas
2010-06-16 18:10 ` [PATCH] use tail pointer for LOOP David Kastrup
2010-06-17 5:10 ` tomas
2010-06-17 7:18 ` Thien-Thi Nguyen
2010-06-17 9:22 ` tomas
2010-06-17 10:03 ` Thien-Thi Nguyen
2010-06-17 14:05 ` tomas
2010-06-17 15:16 ` Thien-Thi Nguyen
2010-06-17 10:12 ` Thien-Thi Nguyen
2010-06-17 20:48 ` Stefan Monnier [this message]
2010-06-18 7:07 ` David Kastrup
2010-06-18 13:40 ` Stefan Monnier
2010-05-30 17:05 ` Štěpán Němec
2010-05-30 17:09 ` Daniel Colascione
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=jwvpqzpcrqe.fsf-monnier+emacs@gnu.org \
--to=monnier@iro.umontreal.ca \
--cc=dak@gnu.org \
--cc=emacs-devel@gnu.org \
--cc=tomas@tuxteam.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.