From: David Kastrup <dak@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Perferr cond over case?
Date: Mon, 12 Oct 2009 10:03:39 +0200 [thread overview]
Message-ID: <87fx9p599g.fsf@lola.goethe.zz> (raw)
In-Reply-To: 87fx9pre0y.fsf@galatea.local
pjb@informatimago.com (Pascal J. Bourguignon) writes:
> Nordlöw <per.nordlow@gmail.com> writes:
>
>> Does the use of the cl macro case() incurr some loss of performance
>> compare to using cond() instead?
>
> (macroexpand '(case (* 2 2 2 2 3)
> (10 'one)
> ((24 42) 'two)
> ((3 33) 'three)
> (otherwise 'unknown)))
> -->
> (let ((--cl-var-- (* 2 2 2 2 3)))
> (cond ((eql --cl-var-- (quote 10)) (quote one))
> ((member* --cl-var-- (quote (24 42))) (quote two))
> ((member* --cl-var-- (quote (3 33))) (quote three))
> (t (quote unknown))))
>
> What do you think?
Before or after byte compilation?
--
David Kastrup
prev parent reply other threads:[~2009-10-12 8:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-11 12:09 Perferr cond over case? Nordlöw
2009-10-11 18:17 ` Pascal J. Bourguignon
2009-10-12 8:03 ` David Kastrup [this message]
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