[issue26814] [WIP] Add a new _PyObject_FastCall() function which avoids the creation of a tuple or dict for arguments

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I have collected statistics about using CALL_FUNCTION* opcodes in compliled code during running CPython testsuite. According to it, 99.4% emitted opcodes is the CALL_FUNCTION opcode, and 89% of emitted CALL_FUNCTION opcodes have only positional arguments, and 98% of them have not more than 3 arguments.

That was about calls from Python code. All convenient C API functions (like PyObject_CallFunction and PyObject_CallFunctionObjArgs) used for direct calling in C code use only positional arguments.

Thus I think we need to optimize only cases of calling with small number (0-3) of positional arguments.

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<http://bugs.python.org/issue26814>
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