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Showing content from https://mail.python.org/pipermail/python-dev/2002-August/027719.html below:

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

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On Mon, Aug 12, 2002 at 08:44:46PM -0400, Tim Peters wrote:
> [Jeff Epler]
> > (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.

Of course, "all common machines" simply means "x86 machines".

Jeff

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