From: Thien-Thi Nguyen <ttn@gnuvola.org>
To: tomas@tuxteam.de
Cc: emacs-devel@gnu.org
Subject: Re: [PATCH] use tail pointer for LOOP
Date: Thu, 17 Jun 2010 12:03:16 +0200 [thread overview]
Message-ID: <87iq5i563f.fsf@ambire.localdomain> (raw)
In-Reply-To: <20100617092232.GA27846@tomas> (tomas@tuxteam.de's message of "Thu, 17 Jun 2010 11:22:32 +0200")
() tomas@tuxteam.de
() Thu, 17 Jun 2010 11:22:32 +0200
Cute. You all are successfully keeping me from work. Enjoing it ;-)
Here are the results. Attached the modified source.
copy1: (1.058881 5 0.7366780000000048)
copy2: (1.27958 6 0.8913360000000026)
copy3: (1.337353 6 0.9249420000000015)
Still the reverse version is the winner. Yours seems to be a tad slower
(although I wouldn't know whether it's in the noise).
But it looks so sharp ;-)
How about this one?
(defun copy4 (lst)
"Return a copy of LST."
(let* ((box (list nil))
(tp box))
(while lst
(setq tp (setcdr tp (list (pop lst)))))
(cdr box)))
thi
next prev parent reply other threads:[~2010-06-17 10:03 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 [this message]
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
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
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