From b69ee8c38642a4efd0b880f0c8651010aa7883b9 Mon Sep 17 00:00:00 2001 From: Victor Stinner Date: Mon, 28 Nov 2016 18:32:31 +0100 Subject: call_function(): document PyMethod optimization --- Python/ceval.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/Python/ceval.c b/Python/ceval.c index 569c609..42c0c61 100644 --- a/Python/ceval.c +++ b/Python/ceval.c @@ -4736,7 +4736,11 @@ call_function(PyObject ***pp_stack, Py_ssize_t oparg, PyObject *kwnames) } else { if (PyMethod_Check(func) && PyMethod_GET_SELF(func) != NULL) { - /* optimize access to bound methods */ + /* Optimize access to bound methods. Reuse the Python stack + to pass 'self' as the first argument, replace 'func' + with 'self'. It avoids the creation of a new temporary tuple + for arguments (to replace func with self) when the method uses + FASTCALL. */ PyObject *self = PyMethod_GET_SELF(func); Py_INCREF(self); func = PyMethod_GET_FUNCTION(func); -- cgit v0.12