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bpo-29737: Optimize concatenating with empty tuple. (#524)

This commit is contained in:
Serhiy Storchaka 2017-03-06 23:39:35 +02:00 committed by GitHub
parent be487a65f1
commit 98e80c2bab
1 changed files with 8 additions and 0 deletions
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8
Objects/tupleobject.c
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@ -446,6 +446,10 @@ tupleconcat(PyTupleObject *a, PyObject *bb)
Py_ssize_t i;
PyObject **src, **dest;
PyTupleObject *np;
if (Py_SIZE(a) == 0 && PyTuple_CheckExact(bb)) {
Py_INCREF(bb);
return bb;
}
if (!PyTuple_Check(bb)) {
PyErr_Format(PyExc_TypeError,
"can only concatenate tuple (not \"%.200s\") to tuple",
@ -453,6 +457,10 @@ tupleconcat(PyTupleObject *a, PyObject *bb)
return NULL;
}
#define b ((PyTupleObject *)bb)
if (Py_SIZE(b) == 0 && PyTuple_CheckExact(a)) {
Py_INCREF(a);
return (PyObject *)a;
}
if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b))
return PyErr_NoMemory();
size = Py_SIZE(a) + Py_SIZE(b);