STINNER Victor added the comment:

msg223186, Serhiy Storchaka about inline.patch: "Confirmed speed up about 20%. 
Surprisingly it affects even integers outside of the of preallocated small 
integers (-5...255)."

The optimization applies to Python int with 0 or 1 digit so in range [-2^30+1; 
2^30-1].

Small integers in [-5; 255] might be faster but for PyLong_FromLong().

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<http://bugs.python.org/issue21955>
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