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

From: Dmitry Gutov <[email-masked]>
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).