[issue23492] Argument Clinic: improve generated parser for 1-argument functions

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

After expanding PyArg_Parse for "i" and "D" codes above tests give following results:

$ ./python -m timeit "chr(0x20ac)"
1000000 loops, best of 3: 0.558 usec per loop

$ ./python -m timeit -s "from cmath import isnan; x = 1j" -- "isnan(x)"
1000000 loops, best of 3: 0.278 usec per loop

About twice in comparison with initial variant!

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<http://bugs.python.org/issue23492>
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