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

[Antoine Pitrou]

Antoine Pitrou added the comment:

I agree with Marc-Andre, people doing FP-heavy math in Python use Numpy (possibly with Numba, Cython or any other additional library). Micro-optimizing floating-point operations in the eval loop makes little sense IMO.

The point of optimizing integers is that they are used for many purposes, not only "math" (e.g. indexing).

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