bpo-42161: Micro-optimize _collections._count_elements() (GH-23008)
Move the _PyLong_GetOne() call outside the fast-path loop.
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@ -2278,6 +2278,7 @@ _collections__count_elements_impl(PyObject *module, PyObject *mapping,
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PyObject *dict_get;
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PyObject *mapping_setitem;
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PyObject *dict_setitem;
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PyObject *one = _PyLong_GetOne(); // borrowed reference
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it = PyObject_GetIter(iterable);
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if (it == NULL)
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@ -2324,10 +2325,10 @@ _collections__count_elements_impl(PyObject *module, PyObject *mapping,
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if (oldval == NULL) {
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if (PyErr_Occurred())
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goto done;
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if (_PyDict_SetItem_KnownHash(mapping, key, _PyLong_GetOne(), hash) < 0)
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if (_PyDict_SetItem_KnownHash(mapping, key, one, hash) < 0)
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goto done;
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} else {
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newval = PyNumber_Add(oldval, _PyLong_GetOne());
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newval = PyNumber_Add(oldval, one);
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if (newval == NULL)
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goto done;
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if (_PyDict_SetItem_KnownHash(mapping, key, newval, hash) < 0)
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@ -2336,13 +2337,13 @@ _collections__count_elements_impl(PyObject *module, PyObject *mapping,
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}
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Py_DECREF(key);
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}
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} else {
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}
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else {
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bound_get = _PyObject_GetAttrId(mapping, &PyId_get);
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if (bound_get == NULL)
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goto done;
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PyObject *zero = _PyLong_GetZero(); // borrowed reference
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PyObject *one = _PyLong_GetOne(); // borrowed reference
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while (1) {
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key = PyIter_Next(it);
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if (key == NULL)
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