Re: Time to merge scratch/correct-warning-pos into master, perhaps?

[Eli Zaretskii]

> Date: Fri, 4 Feb 2022 21:24:56 +0000
> Cc: gregory@heytings.org, monnier@iro.umontreal.ca, mattiase@acm.org,
>   larsi@gnus.org, emacs-devel@gnu.org
> From: Alan Mackenzie <acm@muc.de>
> 
> > First, are symbols-with-pos supposed to happen in bytecode that
> > doesn't deal with byte compilation?
> 
> Symbols with pos are intended to be used only in compilation, native- as
> well as byte-.  They mustn't be output to .elc files.

So that would mean the slowdown of EQ is due to the cases where the
objects are not-EQ?  Where are the numbers that show how much slower
is the current EQ, for the case of EQ and not-EQ objects?

> > If yes, why/when would such objects appear in GP bytecode?
> 
> What does "GP" mean here, please?

General Purpose.

> > > > What is there in a symbol-with-pos except the symbol and the position?
> 
> > > There is the symbol, the position, and a pseudovector header.
> 
> > The pseudovector part is not needed if we just extend Lisp_Symbol to
> > have an additional field 'position'.
> 
> Yes.  I'm not sure we can do this, though.

Let's revisit that once we understand the slowdown of EQ better and
more quantitatively.