Re: new GC code merged

[Lynn Winebarger]

On Saturday 17 August 2002 19:36, Han-Wen Nienhuys wrote:
> address@hidden writes:
> 
> >        Excuse my ignorance.  The notes in tag.h indicate that the
> > least significant bit of the 2nd word of a cell is used for marking.
> > I was reading gc.h and it appears the mark bits are stored
> > separately.  On the other hand, I looked at a copy of guile from
> > before your changes and it might also have used separate mark
> > bitvectors.  So is that lsb of the second word of a cell actually
> > free for some other use besides marking?
> 
> This has been changed shortly after 1.4 was released. It's free for
> use, but since all the tags live in the first word of a cell, I don't
> readily see a use for it (but I don't know much about implementations
> for LISP like languages)
> 
      You just never know when an extra bit might come in handy.  Now that 
I look again, the comments don't say that last bit is used for gc (as they did 
a few months ago).

Lynn