Joannah Nanjekye <nanjekyejoan...@gmail.com> added the comment:

> About "5 bits", no, we don't have 'em.  Even the relatively modest > ugliness 
> we have now makes it impossible to port Python to a word->addressed machine 
> (I'm not sure any still exist!).  Nothing in C >guarantees the last 2 or 3 
> bits of a pointer "are 0".  We're already >using two words to store 2 
> persistent pointers, one persistent flag, a >full-width transient reference 
> count, and two transient flags.

In view of this, +1 for avoiding the extra bits for age storage. The steps 
scheme will work best in this case.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39143>
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