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Tue Aug 30 19:50:01 CEST 2011 · https://mail.python.org/pipermail/python-dev/2011-August/113368.html

> Do you really need it to match a machine word? Or is, say, a 16-bit
> format sufficient.
>
Hm, technically no, but practically it makes more sense, as (at least
for x86 architectures) having opargs and opcodes in half-words can be
efficiently expressed in assembly. On 64bit architectures, I could
also inline data object references that fit into the 32bit upper half.
It turns out that most constant objects fit nicely into this, and I
have used this for a special cache region (again below 2^32) for
global objects, too. So, technically it's not necessary, but
practically it makes a lot of sense. (Most of these things work on
32bit systems, too. For architectures with a smaller size, we can
adapt or disable the optimizations.)

Cheers,
--stefan

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[Python-Dev] Python 3 optimizations continued...