From: Ted Zlatanov <tzz@lifelogs.com>
To: emacs-devel@gnu.org
Subject: Re: pcase-memoize: equal first branch, yet different
Date: Tue, 05 Mar 2013 04:59:45 -0500 [thread overview]
Message-ID: <8738warwtq.fsf@lifelogs.com> (raw)
In-Reply-To: jwvlia3as3p.fsf-monnier+emacs@gnu.org
On Mon, 04 Mar 2013 14:33:41 -0500 Stefan Monnier <monnier@iro.umontreal.ca> wrote:
SM> The pcase macro's expansion can take a significant amount of time to
SM> generate. When done during byte-compilation, it's a non-issue, but in
SM> the above example it will be done every time you click.
SM> For this reason, pcase uses a memoization mechanism, to try and reuse
SM> previous expansions. Sadly, this is unreliable because it is difficult
SM> to figure out when two chunks of code are actually identical and to do
SM> so without incurring undue overheads.
Would it make sense to implement some parts of `pcase' at the C level?
As it becomes widely used, byte-compilation delays can also become
significant.
(For the record, I like `pcase' a lot, and really appreciate the
simplicity pattern matching brings to code.)
Ted
next prev parent reply other threads:[~2013-03-05 9:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-01 15:17 pcase-memoize: equal first branch, yet different Michael Heerdegen
2013-03-01 21:45 ` Michael Heerdegen
2013-03-04 19:33 ` Stefan Monnier
2013-03-05 9:59 ` Ted Zlatanov [this message]
2013-03-05 15:41 ` Stefan Monnier
2013-03-05 19:03 ` Ted Zlatanov
2013-03-05 14:13 ` Michael Heerdegen
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