GNU bug report logs - #20629
25.0.50; Regression: TAGS broken, can't find anything in C++ files.

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 20629 <at> debbugs.gnu.org
Subject: bug#20629: 25.0.50; Regression: TAGS broken, can't find anything in C++ files.
Date: Fri, 29 May 2015 23:33:58 +0300

On 05/29/2015 10:19 PM, Stefan Monnier wrote:

> Oh, then it's a non-starter (unless the search can be sped up).

I've posted the numbers along with the two versions of the patch:

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20629#101
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20629#107

Someone else might have better luck, but it seems to me that 
dramatically improving the performance there would have to involve work 
on the regexp engine and/or the Elisp interpreter.

Byte-compiling the new etags.el, as I measured later, improves the 
worst-case time of the second patch from 3s to 1.9s. No effect on the 
runtimes of the first patch (still 0.7s per any completion).

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