[gclist] Experience with conservative GC sought

Jim Blandy jimb@red-bean.com
Fri, 23 Jan 1998 10:47:23 -0500

>How does Emacs currently tag pointers?  ... On the other hand, if
>you're tagging the high-order bits, then it would definitely be
>harder -- not impossible, but a non-trivial amount of work.

Emacs tags the high-order bits.  For fixnums and conses (and maybe one
or two other types), that's all the type information there is.  The
representations of the other types start with a type word.