GNU bug report logs - #20887
'make bootstrap' now verrrry slow due to recent isearch changes

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Message #44 received at 20887 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: bruce.connor.am <at> gmail.com
Cc: 20887 <at> debbugs.gnu.org
Subject: Re: bug#20887: 'make bootstrap' now verrrry slow due to recent
 isearch changes
Date: Wed, 24 Jun 2015 22:14:51 +0300

> Date: Wed, 24 Jun 2015 18:18:51 +0100
> From: Artur Malabarba <bruce.connor.am <at> gmail.com>
> Cc: 20887 <at> debbugs.gnu.org
> 
> > Btw, did you try replacing a simple iteration through all the
> > characters with map-char-table?
> 
> Hadn't thought of that. Indeed, the second loop can be replaced by a
> map-char-table, and it speeds things up by about 30%.

Why only the second?  All you care about is decomposition, that is,
you need only loop over characters that have a non-nil value in the
decomposition property.  You will see in characters.el how you can use
map-char-table over a char-table loaded from uni-decomposition.el
(similar to what we do there with uni-bidi et.).  Won't that be much
faster?

(I didn't actually try that, so perhaps I'm talking nonsense.)

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