diff options
Diffstat (limited to 'Python/bltinmodule.c')
| -rw-r--r-- | Python/bltinmodule.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c index 76c9f87..38bdfb2 100644 --- a/Python/bltinmodule.c +++ b/Python/bltinmodule.c @@ -2479,7 +2479,15 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start) return PyLong_FromLong(i_result); } if (PyLong_CheckExact(item) || PyBool_Check(item)) { - long b = PyLong_AsLongAndOverflow(item, &overflow); + long b; + overflow = 0; + /* Single digits are common, fast, and cannot overflow on unpacking. */ + switch (Py_SIZE(item)) { + case -1: b = -(sdigit) ((PyLongObject*)item)->ob_digit[0]; break; + case 0: continue; + case 1: b = ((PyLongObject*)item)->ob_digit[0]; break; + default: b = PyLong_AsLongAndOverflow(item, &overflow); break; + } if (overflow == 0 && (i_result >= 0 ? (b <= LONG_MAX - i_result) : (b >= LONG_MIN - i_result))) |