Add fast paths to deque_init() for the common cases
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index d9df574..0c64713 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -1456,8 +1456,14 @@
Py_ssize_t maxlen = -1;
char *kwlist[] = {"iterable", "maxlen", 0};
- if (!PyArg_ParseTupleAndKeywords(args, kwdargs, "|OO:deque", kwlist, &iterable, &maxlenobj))
- return -1;
+ if (kwdargs == NULL) {
+ if (!PyArg_UnpackTuple(args, "deque()", 0, 2, &iterable, &maxlenobj))
+ return -1;
+ } else {
+ if (!PyArg_ParseTupleAndKeywords(args, kwdargs, "|OO:deque", kwlist,
+ &iterable, &maxlenobj))
+ return -1;
+ }
if (maxlenobj != NULL && maxlenobj != Py_None) {
maxlen = PyLong_AsSsize_t(maxlenobj);
if (maxlen == -1 && PyErr_Occurred())
@@ -1468,7 +1474,8 @@
}
}
deque->maxlen = maxlen;
- deque_clear(deque);
+ if (Py_SIZE(deque) > 0)
+ deque_clear(deque);
if (iterable != NULL) {
PyObject *rv = deque_extend(deque, iterable);
if (rv == NULL)