Raymond Hettinger added the comment:

It would have been nice to have timed this on ARM chips or 32-bit builds.  I 
suspect that the previous code was mainly beneficial in register starved 
environments when it would have saved some memory accesses whenever there were 
an immediate first hit on a dictionary lookup (which is common).  Also, it is 
more likely to make a difference on larger dicts where the memory accesses 
aren't all in L1 cache.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29304>
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