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Re: new GC code merged
From: |
Lynn Winebarger |
Subject: |
Re: new GC code merged |
Date: |
Sat, 17 Aug 2002 20:31:23 -0500 |
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