--- /dev/null
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "AddCanonicalizer.h"
+
+#include "Annotations/ShapeInferenceData.h"
+
+#include "Dialect/TFDialect.h"
+#include "Dialect/TFNodes.h"
+#include "Dialect/TFNodeVisitor.h"
+#include "Dialect/TFNodeImpl.h"
+
+#include <stdex/Memory.h>
+
+namespace
+{
+
+bool canonicalize_add(loco::Graph *graph, moco::tf::TFAdd *node)
+{
+ /**
+ * @note This will replace TFAdd node with Canonical EltwiseAdd
+ *
+ * Before
+ * A --- TFAdd -- C
+ * B --/
+ * After
+ * +------ TFAdd --
+ * | /
+ * B -------
+ * | \
+ * A -+------ EltwiseAdd -- C
+ *
+ * Where
+ * A : x of TFAdd
+ * B : y of TFAdd
+ * C : a node that uses TFAdd as an input
+ * TFAdd is disconnected from C
+ */
+
+ auto ewadd_node = graph->nodes()->create<loco::EltwiseAdd>();
+
+ // check condition: shape should be same
+ auto node_A = node->x();
+ auto node_B = node->y();
+
+ auto x_shapedata = node_A->annot<moco::tf::ShapeInferenceData>();
+ assert(x_shapedata != nullptr);
+ auto y_shapedata = node_B->annot<moco::tf::ShapeInferenceData>();
+ assert(y_shapedata != nullptr);
+
+ if (!(*x_shapedata == *y_shapedata))
+ {
+ // TODO support broadcast Add
+ return false;
+ }
+
+ // update connections
+ ewadd_node->lhs(node_A);
+ ewadd_node->rhs(node_B);
+
+ // replace node
+ replace(node).with(ewadd_node);
+
+ return true;
+}
+
+} // namespace
+
+namespace moco
+{
+namespace tf
+{
+
+bool AddCanonicalizer::run(loco::Graph *graph)
+{
+ auto active_nodes = loco::active_nodes(loco::output_nodes(graph));
+ bool changed = false;
+
+ for (auto node : active_nodes)
+ {
+ if (node->dialect() == TFDialect::get())
+ {
+ auto tf_node = dynamic_cast<moco::tf::TFAdd *>(node);
+ if (tf_node != nullptr)
+ {
+ if (canonicalize_add(graph, tf_node))
+ changed = true;
+ }
+ }
+ }
+
+ return changed;
+}
+
+} // namespace tf
+} // namespace moco
--- /dev/null
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __MOCO_TF_ADD_CANONICALIZER_H__
+#define __MOCO_TF_ADD_CANONICALIZER_H__
+
+#include "Transform.h"
+
+#include <loco.h>
+
+namespace moco
+{
+namespace tf
+{
+
+/**
+ * @brief Convert TFAdd to Canonical EltwiseAdd
+ */
+class AddCanonicalizer : public Transform
+{
+public:
+ const char *name(void) const final { return "AddCanonicalizer"; }
+
+public:
+ bool run(loco::Graph *graph) override;
+};
+
+} // namespace tf
+} // namespace moco
+
+#endif // __MOCO_TF_ADD_CANONICALIZER_H__