[issue21955] ceval.c: implement fast path for integers with a single digit

[STINNER Victor]

STINNER Victor added the comment:

> Unless there are any objections, I'll commit fastint5.patch in a day or two.

Please don't. I would like to have time to benchmark all these patches (there are now 9 patches attached to the issue :-)) and I would like to hear Serhiy's feedback on your latest patches.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21955>
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