IncSubtensor: generalized copy_into functionality

theano/sandbox/cuda/basic_ops.py

@@ -2457,6 +2457,16 @@ class GpuIncSubtensor(tensor.IncSubtensor, GpuOp):
         """ Return the update_flags string to pass to helper_c_code."""
         return ""
 
+    def copy_into(self, view, source):
+        """
+            view: string, C code expression for an array
+            source: string, C code expression for an array
+
+            returns a C code expression to copy source into view, and
+            return 0 on success
+        """
+        return """CudaNdarray_CopyFromCudaNdarray(%(view)s, %(source)s)""" % locals()
+
     def c_code_cache_version(self):
         # TODO: cooperate with parent class' C code
         return ()

theano/tensor/basic.py

@@ -4608,10 +4608,12 @@ class IncSubtensor(Op):
                 update_flags=self.get_update_flags()
                 )
 
+        copy_into = self.copy_into("xview", y)
+
         make_modification = """
         if (%(op_is_set)s)
         {
-            if (PyArray_CopyInto(xview, %(y)s)) // does broadcasting
+            if (%(copy_into)s) // does broadcasting
             {
                 Py_DECREF(xview);
                 %(fail)s;
@@ -4704,6 +4706,16 @@ class IncSubtensor(Op):
         """ Return the update_flags string to pass to helper c_code."""
         return Subtensor.default_update_flags()
 
+    def copy_into(self, view, source):
+        """
+            view: string, C code expression for an array
+            source: string, C code expression for an array
+
+            returns a C code expression to copy source into view, and
+            return 0 on success
+        """
+        return """PyArray_CopyInto(%(view)s, %(source)s)""" % locals()
+
 
     def infer_shape(self, node, shapes):
         return [shapes[0]]