[issue46020] Optimize long_pow for the common case

[Ken Jin]

Ken Jin <kenjin4096 at gmail.com> added the comment:

I'm not sure about the original 10:1 difference in 3.10, but in 3.11, the 2:1 difference might be due to the PEP 659 machinery optimizing for int * int, and float * float cases (see BINARY_OP_MULTIPLY_INT and BINARY_OP_MULTIPLY_FLOAT in ceval).

Last I recall, these were slightly faster than their unspecialized counterparts as they have less overhead in C function calls. Meanwhile, none of the power operations are optimized via PEP 659 machinery at the moment.

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nosy: +kj

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