Re: Emacs Lisp JIT Compiler

[Paul Eggert]

This sounds very interesting. I assume you'd publish it first on a branch so 
that we could look at it? Some questions:

> I have only tested this on x86-64.  Whether or not the JIT works on a
> given platform is primarily up to libjit.  (I suspect the JIT won't work
> on x86 with --with-wide-int; but that is something I could fix.)

When you say "doesn't work", does that mean Emacs can reliably tell the JIT 
won't work and fall back on the current bytecode implementation, or something else?

> libjit never frees functions.  So, if a function is JIT-compiled
> and then redefined, the old JIT code will linger.  It's possible to fix
> this with a custom allocator and a libjit patch (that I sent but that
> hasn't been checked in yet).

libjit has only one committer, Aleksey, and no commits since March. Is there a 
bottleneck there?