New submission from Oren Milman:
in Objects/object.c, Py_ReprEnter() does the following:
- try to retrieve the Py_Repr list from the thread-state dict.
- in case the list is not in the dict, add it to the dict as an empty list.
- check whether the received object is in the Py_Repr list, even in case the
list was just created, and guaranteed to be empty.
I propose to put this check inside an else clause, so that it wouldn't take
place in case the list is guaranteed to be empty, i.e.:
list = _PyDict_GetItemId(dict, &PyId_Py_Repr);
if (list == NULL) {
list = PyList_New(0);
...
}
else {
i = PyList_GET_SIZE(list);
while (--i >= 0) {
if (PyList_GET_ITEM(list, i) == obj)
return 1;
}
}
I ran the test suite, and it seems that this change doesn't break anything, so
I would be happy to open a PR for it.
----------
components: Interpreter Core
messages: 300193
nosy: Oren Milman
priority: normal
severity: normal
status: open
title: suboptimal code in Py_ReprEnter()
type: performance
versions: Python 3.7
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<http://bugs.python.org/issue31187>
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