from 119771: adjust errno on overflows in _Py_c_pow()

Before we did this in complex_pow() and behaviour of the public C API
function ``_Py_c_pow()`` was different from the pure-python pow().

Author: skirpichev

Doc/c-api/complex.rst

@@ -75,6 +75,8 @@ pointers.  This is consistent throughout the API.
    If *num* is null and *exp* is not a positive real number,
    this method returns zero and sets :c:data:`errno` to :c:macro:`!EDOM`.
 
+   Set :c:data:`errno` to :c:macro:`!ERANGE` on overflows.
+
 
 Complex Numbers as Python Objects
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Lib/test/test_capi/test_complex.py

@@ -229,7 +229,10 @@ def test_py_c_pow(self):
 
         self.assertEqual(_py_c_pow(0j, -1)[1], errno.EDOM)
         self.assertEqual(_py_c_pow(0j, 1j)[1], errno.EDOM)
-        self.assertEqual(_py_c_pow(*[DBL_MAX+1j]*2)[0], complex(*[INF]*2))
+        self.assertEqual(_py_c_pow(*[DBL_MAX+1j]*2),
+                         (complex(*[INF]*2), errno.ERANGE))
+        self.assertEqual(_py_c_pow(DBL_MAX+1j, 2),
+                         (complex(*[INF]*2), errno.ERANGE))
 
     def test_py_c_abs(self):
         # Test _Py_c_abs()

Objects/complexobject.c

@@ -278,6 +278,8 @@ _Py_c_pow(Py_complex a, Py_complex b)
         }
         r.real = len*cos(phase);
         r.imag = len*sin(phase);
+
+        _Py_ADJUST_ERANGE2(r.real, r.imag);
     }
     return r;
 }
@@ -773,12 +775,12 @@ complex_pow(PyObject *v, PyObject *w, PyObject *z)
     // a faster and more accurate algorithm.
     if (b.imag == 0.0 && b.real == floor(b.real) && fabs(b.real) <= 100.0) {
         p = c_powi(a, (long)b.real);
+        _Py_ADJUST_ERANGE2(p.real, p.imag);
     }
     else {
         p = _Py_c_pow(a, b);
     }
 
-    _Py_ADJUST_ERANGE2(p.real, p.imag);
     if (errno == EDOM) {
         PyErr_SetString(PyExc_ZeroDivisionError,
                         "zero to a negative or complex power");