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Re: C and Emacs Lisp code parts

From: Alan Mackenzie
Subject: Re: C and Emacs Lisp code parts
Date: Fri, 1 Jul 2016 17:55:15 +0000
User-agent: Mutt/1.5.24 (2015-08-30)

Hello, Andreas.

On Fri, Jul 01, 2016 at 07:36:23PM +0200, Andreas Röhler wrote:

> On 01.07.2016 19:13, Eli Zaretskii wrote:
> >> From: Andreas Röhler <address@hidden>
> >> Date: Fri, 1 Jul 2016 18:52:42 +0200

> >> The whole display-engine IMO is a hot candidate for a thoroughly
> >> re-consideration.
> > The display engine is entirely in C already, so I'm not sure what are
> > you talking about.

> So stuff in font-lock.el isn't display-related?

It is display "related", but then pretty much everything else in Emacs
is display "related" too.

font-lock.el is not part of the display engine, in the sense that term
is used in Emacs.

Do you think that rewriting font-lock.el in C would help speed up Emacs
much?  If you do, why not back up your opinion with some numbers.  You
can get the numbers with M-x profiler-start (followed at a later stage
by M-x profiler-report) or M-x elp-instrument-package (followed at a
later stage by M-x elp-results).

My own feeling is that font-lock.el works fast enough (i.e. even
eliminating the time it takes wouldn't give a noticeable speed up), but
I'm willing to be persuaded otherwise by some good numbers.

Alan Mackenzie (Nuremberg, Germany).

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