Re: slow bison run

[Hans Aberg]

At 02:26 +0200 2005/05/18, Hans Aberg wrote:
> At 16:18 -0700 2005/05/16, Paul Eggert wrote:
> >  > The m4 version of bison is much slower with this file than the 
> > cpp version.
> > >  It looks like most of the additional time is spent in m4.
> >
> > Yes, the current version of Bison is way, way too slow for large
> > grammars.  (Your grammar took 90 seconds for Bison to process on my
> > 2.4 GHz Pentium 4 box.)  Fixing this is on my long list of things to do.
> >
> > In the mean time you should consider installing the latest version of
> > GNU m4, as it's a bit faster.
>
> Would it be faster with Guile?

Specifically, I think it might be faster with Guile than with M4, as 
it has a properly designed functional language at the core. There is 
supposedly a Bison version around with Guile attached. So it would be 
interesting to feed it with a large grammar, and time it, relative 
the Bison-M4 version. If it is significantly faster, it will mean 
that there is no problem to spend too much effort on the Bison-M4 
version.
--
  Hans Aberg