237         if (Py_IS_NAN(x) || x > 0.0)  in m_tgamma()
337         if (Py_IS_NAN(x))  in m_lgamma()
494     if (Py_IS_NAN(x))  in m_erf()
512     if (Py_IS_NAN(x))  in m_erfc()
534     if (Py_IS_NAN(x) || Py_IS_NAN(y))  in m_atan2()
578     else if (Py_IS_NAN(x))  in m_log()
600     else if (Py_IS_NAN(x))  in m_log10()
692     if (Py_IS_NAN(r)) {  in math_1()
693         if (!Py_IS_NAN(x))  in math_1()
772     if (Py_IS_NAN(r)) {  in math_2()
773         if (!Py_IS_NAN(x) && !Py_IS_NAN(y))  in math_2()
1032         if (Py_IS_NAN(inf_sum))  in math_fsum()
1163     if (Py_IS_NAN(x) || Py_IS_INFINITY(x) || !x) {  in math_frexp()
1248         else if (Py_IS_NAN(x))  in math_modf()
1371     if (Py_IS_NAN(r)) {  in math_fmod()
1372         if (!Py_IS_NAN(x) && !Py_IS_NAN(y))  in math_fmod()
1407     if (Py_IS_NAN(r)) {  in math_hypot()
1408         if (!Py_IS_NAN(x) && !Py_IS_NAN(y))  in math_hypot()
1453         if (Py_IS_NAN(x))  in math_pow()
1455         else if (Py_IS_NAN(y))  in math_pow()
1489             if (Py_IS_NAN(r)) {  in math_pow()
1550     return PyBool_FromLong((long)Py_IS_NAN(x));  in math_isnan()