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Showing content from http://mail.python.org/pipermail/python-dev/2002-August/027705.html below:

[Python-Dev] Performance (non)optimization: 31-bit ints in pointers

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[Jeff Epler]
> Many Lisp interpreters use 'tagged types' to, among other things, let
> small ints reside directly in the machine registers.

And many Lisp interpreters derive from ones written for once-trendy Lisp
hardware, which had special support for tag bits.  Simulating this in
software is a PITA.

> (due to alignment requirements on all common machines, all valid
> pointers-to-struct have 0 in their low bit)

Not so on word-addressed machines, though, or on machines using low-order
pointer bits for their own notion of tag bits.

patiently-awaiting-seymour-cray's-resurrection-ly y'rs  - tim

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