diff options
| -rw-r--r-- | Misc/NEWS | 1 | ||||
| -rw-r--r-- | Objects/longobject.c | 7 |
2 files changed, 8 insertions, 0 deletions
@@ -165,6 +165,7 @@ Core and Builtins - Issue #25660: Fix TAB key behaviour in REPL with readline. +- Issue #26288: Optimize PyLong_AsDouble. Library ------- diff --git a/Objects/longobject.c b/Objects/longobject.c index d05de8b..c1edeac 100644 --- a/Objects/longobject.c +++ b/Objects/longobject.c @@ -2769,6 +2769,13 @@ PyLong_AsDouble(PyObject *v) PyErr_SetString(PyExc_TypeError, "an integer is required"); return -1.0; } + if (Py_ABS(Py_SIZE(v)) <= 1) { + /* Fast path; single digit will always fit decimal. + This improves performance of FP/long operations by at + least 20%. This is even visible on macro-benchmarks. + */ + return (double)MEDIUM_VALUE((PyLongObject *)v); + } x = _PyLong_Frexp((PyLongObject *)v, &exponent); if ((x == -1.0 && PyErr_Occurred()) || exponent > DBL_MAX_EXP) { PyErr_SetString(PyExc_OverflowError, |