Replace PyObject_CallFunctionObjArgs() with fastcall

* PyObject_CallFunctionObjArgs(func, NULL) => _PyObject_CallNoArg(func)
* PyObject_CallFunctionObjArgs(func, arg, NULL) => _PyObject_CallArg1(func, arg)

PyObject_CallFunctionObjArgs() allocates 40 bytes on the C stack and requires
extra work to "parse" C arguments to build a C array of PyObject*.

_PyObject_CallNoArg() and _PyObject_CallArg1() are simpler and don't allocate
memory on the C stack.

This change is part of the fastcall project. The change on listsort() is
related to the issue #23507.

1 files changed, 3 insertions, 4 deletions

diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 5cdc2ca..b82945a 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -549,7 +549,7 @@ format_obj(PyObject *v, const char **pbuf, Py_ssize_t *plen)
     /* does it support __bytes__? */
     func = _PyObject_LookupSpecial(v, &PyId___bytes__);
     if (func != NULL) {
-        result = PyObject_CallFunctionObjArgs(func, NULL);
+        result = _PyObject_CallNoArg(func);
         Py_DECREF(func);
         if (result == NULL)
             return NULL;
@@ -2331,8 +2331,7 @@ bytes_fromhex_impl(PyTypeObject *type, PyObject *string)
 {
     PyObject *result = _PyBytes_FromHex(string, 0);
     if (type != &PyBytes_Type && result != NULL) {
-        Py_SETREF(result, PyObject_CallFunctionObjArgs((PyObject *)type,
-                                                       result, NULL));
+        Py_SETREF(result, _PyObject_CallArg1((PyObject *)type, result));
     }
     return result;
 }
@@ -2569,7 +2568,7 @@ bytes_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
        PyObject_Bytes doesn't do. */
     func = _PyObject_LookupSpecial(x, &PyId___bytes__);
     if (func != NULL) {
-        new = PyObject_CallFunctionObjArgs(func, NULL);
+        new = _PyObject_CallNoArg(func);
         Py_DECREF(func);
         if (new == NULL)
             return NULL;