Issue #27005: Optimized the float.fromhex() class method for exact float.
diff --git a/Misc/NEWS b/Misc/NEWS
index 87fa371..c5ad0f7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
Core and Builtins
-----------------
+- Issue #27005: Optimized the float.fromhex() class method for exact float.
+ It is now 2 times faster.
+
- Issue #18531: Single var-keyword argument of dict subtype was passed
unscathed to the C-defined function. Now it is converted to exact dict.
diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index eb60659..f640dd3 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -1195,7 +1195,7 @@
static PyObject *
float_fromhex(PyObject *cls, PyObject *arg)
{
- PyObject *result_as_float, *result;
+ PyObject *result;
double x;
long exp, top_exp, lsb, key_digit;
char *s, *coeff_start, *s_store, *coeff_end, *exp_start, *s_end;
@@ -1410,11 +1410,10 @@
s++;
if (s != s_end)
goto parse_error;
- result_as_float = Py_BuildValue("(d)", negate ? -x : x);
- if (result_as_float == NULL)
- return NULL;
- result = PyObject_CallObject(cls, result_as_float);
- Py_DECREF(result_as_float);
+ result = PyFloat_FromDouble(negate ? -x : x);
+ if (cls != (PyObject *)&PyFloat_Type && result != NULL) {
+ Py_SETREF(result, PyObject_CallFunctionObjArgs(cls, result));
+ }
return result;
overflow_error: