Is there any particular reason why Cython has specific code like
__Pyx_PyObject_Call2Args, __Pyx_PyObject_Call3Args, ...
And then there is even more complicated Python code in PyMethodCallNode
generating something like __Pyx_PyObject_Call2Args for an arbitrary
number of arguments.
This could be simplified a lot by just writing code once to deal with n
arguments and then letting the C compiler do the clever stuff: if you
write a loop where the number of iterations is a small compile-time
constant, the compiler should unroll it.
I checked that GCC-6.4.0 is able to do this and the much simpler code
with a for loop is as efficient as the current code. But maybe there are
other compilers that don't do this (or there used to be such compilers
when that code was written)?
I stumbled on this while working on
https://github.com/cython/cython/issues/2996
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