>>>>> "TP" == Tim Peters <tim_one at email.msn.com> writes:
TP> Jumping in to opine that mixing tag/type bits with native
TP> pointers is a Really Bad Idea. Put the bits on the low end
TP> and word-addressed machines are screwed. Put the bits on the
TP> high end and you've made severe assumptions about how the
TP> platform parcels out address space. In any case you're stuck
TP> with ugly macros everywhere.
Ah, so you /have/ read the Emacs source code! I'll agree that it's
just an RBI for Emacs, but for Python, it'd be a RFSI.
TP> This technique was pioneered by Lisps, and was beautifully
TP> exploited by the Symbolics Lisp Machine and TI Lisp Explorer
TP> hardware. Lisp people don't want to admit those failed, so
TP> continue simulating the HW design by hand at comparatively
TP> sluggish C speed <0.6 wink>.
But of course, the ghosts live on at the FSF and xemacs.org (couldn't
tell ya much about how modren <sic> Lisps do it).
-Barry
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