[issue4258] Use 30-bit digits instead of 15-bit digits for Python integers.

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Updated benchmarks results with 30bit_longdigit17.patch:

* Victor's bench_int.py:
- 32-bit with patch:    1178.3 ms (24% speedup)
- 64-bit with patch:    990.8 ms  (27% speedup)

* Calculating 2000 digits of pi:
- 32-bit with patch:    2.16 s. (25% speedup)
- 64-bit with patch:    1.5 s.  (55% speedup)

This is very good work.

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<http://bugs.python.org/issue4258>
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