Split an inline helper function to reduce excessive inlining.

Cython/Utility/TypeConversion.c

@@ -204,15 +204,9 @@ static CYTHON_INLINE const char* __Pyx_PyObject_AsString(PyObject* o) {
     return __Pyx_PyObject_AsStringAndSize(o, &ignore);
 }
 
-// Py3.7 returns a "const char*" for unicode strings
-static CYTHON_INLINE const char* __Pyx_PyObject_AsStringAndSize(PyObject* o, Py_ssize_t *length) {
 #if CYTHON_COMPILING_IN_CPYTHON && (__PYX_DEFAULT_STRING_ENCODING_IS_ASCII || __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT)
-    if (
-#if PY_MAJOR_VERSION < 3 && __PYX_DEFAULT_STRING_ENCODING_IS_ASCII
-            __Pyx_sys_getdefaultencoding_not_ascii &&
-#endif
-            PyUnicode_Check(o)) {
 #if PY_VERSION_HEX < 0x03030000
+static const char* __Pyx_PyUnicode_AsStringAndSize(PyObject* o, Py_ssize_t *length) {
     char* defenc_c;
     // borrowed reference, cached internally in 'o' by CPython
     PyObject* defenc = _PyUnicode_AsDefaultEncodedString(o, NULL);
@@ -233,10 +227,14 @@ static CYTHON_INLINE const char* __Pyx_PyObject_AsStringAndSize(PyObject* o, Py_
 #endif /*__PYX_DEFAULT_STRING_ENCODING_IS_ASCII*/
     *length = PyBytes_GET_SIZE(defenc);
     return defenc_c;
+}
+
 #else /* PY_VERSION_HEX < 0x03030000 */
-        if (__Pyx_PyUnicode_READY(o) == -1) return NULL;
+
+static CYTHON_INLINE const char* __Pyx_PyUnicode_AsStringAndSize(PyObject* o, Py_ssize_t *length) {
+    if (unlikely(__Pyx_PyUnicode_READY(o) == -1)) return NULL;
 #if __PYX_DEFAULT_STRING_ENCODING_IS_ASCII
-        if (PyUnicode_IS_ASCII(o)) {
+    if (likely(PyUnicode_IS_ASCII(o))) {
         // cached for the lifetime of the object
         *length = PyUnicode_GET_LENGTH(o);
         return PyUnicode_AsUTF8(o);
@@ -248,7 +246,19 @@ static CYTHON_INLINE const char* __Pyx_PyObject_AsStringAndSize(PyObject* o, Py_
 #else /* __PYX_DEFAULT_STRING_ENCODING_IS_ASCII */
     return PyUnicode_AsUTF8AndSize(o, length);
 #endif /* __PYX_DEFAULT_STRING_ENCODING_IS_ASCII */
+}
 #endif /* PY_VERSION_HEX < 0x03030000 */
+#endif
+
+// Py3.7 returns a "const char*" for unicode strings
+static CYTHON_INLINE const char* __Pyx_PyObject_AsStringAndSize(PyObject* o, Py_ssize_t *length) {
+#if CYTHON_COMPILING_IN_CPYTHON && (__PYX_DEFAULT_STRING_ENCODING_IS_ASCII || __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT)
+    if (
+#if PY_MAJOR_VERSION < 3 && __PYX_DEFAULT_STRING_ENCODING_IS_ASCII
+            __Pyx_sys_getdefaultencoding_not_ascii &&
+#endif
+            PyUnicode_Check(o)) {
+        return __Pyx_PyUnicode_AsStringAndSize(o, length);
     } else
 #endif /* __PYX_DEFAULT_STRING_ENCODING_IS_ASCII  || __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT */