Re: In support of guile-emacs

[David Kastrup]

Alan Mackenzie <address@hidden> writes:

> Hello, Xue.
>
> On Mon, Oct 19, 2015 at 09:07:59AM +0800, Xue Fuqiao wrote:
>
>> guile-emacs replaces Emacs's own Emacs Lisp engine with Guile's (without
>> breaking backward compatibility).  So:
>
>> * Emacs Lisp will execute faster (Guile VM bytecode is more efficient)
>
> Just as a matter of interest, approximately how much faster is Guile
> bytecode than Emacs bytecode?  Are we talking about 10%, 20%, 50%, a
> factor of 2, or even higher?
>
> If that speed increase was significant, it might be worth incorporating
> Guile's bytecode into Emacs just for that reason, regardless of any of
> the other stuff.

A good part of the speedup is with GUILE's compiler stack that
facilitates structural optimizations better than the Emacs
byte-compiler.  Of course, the compiler stack depends on a lot of Scheme
facilities again.  So it's not all that easy to cherry-pick.

-- 
David Kastrup