CIntToPy functions.

Cython/Compiler/PyrexTypes.py

@@ -1566,12 +1566,19 @@ class CIntType(CNumericType):
             self.get_from_py_type_conversion()
 
     def create_from_py_utility_code(self, env):
-        self.from_py_function = "__Pyx_PyInt_As" + self.specialization_name()
+        self.from_py_function = "__Pyx_PyInt_to_py_" + self.specialization_name()
         env.use_utility_code(TempitaUtilityCode.load(
             "CIntFromPy", "TypeConversion.c",
             context={"TYPE": self.declaration_code(''), "FROM_PY_FUNCTION": self.from_py_function}))
         return True
 
+    def create_to_py_utility_code(self, env):
+        self.from_to_function = "__Pyx_PyInt_As" + self.specialization_name()
+        env.use_utility_code(TempitaUtilityCode.load(
+            "CIntToPy", "TypeConversion.c",
+            context={"TYPE": self.declaration_code(''), "TO_PY_FUNCTION": self.from_to_function}))
+        return True
+
     def get_to_py_type_conversion(self):
         if self.rank < list(rank_to_type_name).index('int'):
             # This assumes sizeof(short) < sizeof(int)

Cython/Utility/TypeConversion.c

@@ -449,10 +449,40 @@ static CYTHON_INLINE Py_UNICODE __Pyx_PyObject_AsPy_UNICODE(PyObject* x) {
     return (Py_UNICODE)ival;
 }
 
+
 /////////////// CIntToPy.proto ///////////////
 
+static CYTHON_INLINE PyObject* {{TO_PY_FUNCTION}}({{TYPE}} value);
+
 /////////////// CIntToPy ///////////////
 
+static CYTHON_INLINE PyObject* {{TO_PY_FUNCTION}}({{TYPE}} value) {
+    const {{TYPE}} neg_one = ({{TYPE}}) -1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (is_unsigned) {
+        if (sizeof({{TYPE}}) < sizeof(unsigned long)) {
+            return PyInt_FromLong(value);
+        } else if (sizeof({{TYPE}}) <= sizeof(unsigned long)) {
+            return PyLong_FromUnsignedLong(value);
+        } else if (sizeof({{TYPE}}) <= sizeof(unsigned long long)) {
+            return PyLong_FromUnsignedLongLong(value);
+        }
+    } else {
+        if (sizeof({{TYPE}}) <= sizeof(long)) {
+            return PyInt_FromLong(value);
+        } else if (sizeof({{TYPE}}) <= sizeof(long long)) {
+            return PyLong_FromLong(value);
+        }
+    }
+    {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&value;
+        return _PyLong_FromByteArray(bytes, sizeof({{TYPE}}),
+                                     little, !is_unsigned);
+    }
+}
+
+
 /////////////// CIntFromPyVerify ///////////////
 
 #define __PYX_VERIFY_RETURN_INT(type, value_type, func)             \
@@ -470,6 +500,7 @@ static CYTHON_INLINE Py_UNICODE __Pyx_PyObject_AsPy_UNICODE(PyObject* x) {
         return (type) value;                                        \
     }
 
+
 /////////////// CIntFromPy.proto ///////////////
 
 static CYTHON_INLINE {{TYPE}} {{FROM_PY_FUNCTION}}(PyObject *);