GNU bug report logs - #4222
calls to char_table_ref slow down 23.1 (vs 22.3)

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Message #8 received at 4222 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Kenichi Handa <handa <at> m17n.org>
To: Dan Nicolaescu <dann <at> ics.uci.edu>, 4222 <at> debbugs.gnu.org
Subject: Re: bug#4222: calls to char_table_ref slow down 23.1 (vs 22.3)
Date: Fri, 21 Aug 2009 15:34:10 +0900

> Take src/config.h run C-x r t on it to insert a space in front of each
> line.

> Then build both emacs-23.1 and 22.3 with profiling enabled (-O2 -g -pg).
> Then run:

> emacs -Q -nw config.h
> M-: (indent-region (point-min)(point-max)) RET
> C-x C-c
[...]
> It can be seen that 23.1 is quite a bit slower, and that it has a lot of
> extra calls to char_table_ref.  

> Is there some easy way to reduce the number of those calls?

Please find which char-table is referred so many times.

---
Kenichi Handa
handa <at> m17n.org

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