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diff --git a/compiler/loco/include/loco/IR/Algorithm.h b/compiler/loco/include/loco/IR/Algorithm.h
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+++ b/compiler/loco/include/loco/IR/Algorithm.h
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+/*
+ * 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 __LOCO_IR_ALGORITHM_H__
+#define __LOCO_IR_ALGORITHM_H__
+
+#include "loco/IR/Node.h"
+
+#include <set>
+#include <vector>
+
+namespace loco
+{
+
+/**
+ * @brief Generate postorder traversal sequence starting from "roots"
+ *
+ * HOW TO USE
+ *
+ *  for (auto node : postorder_traversal(...))
+ *  {
+ *    ... node->do_something() ...
+ *  }
+ *
+ */
+std::vector<loco::Node *> postorder_traversal(const std::vector<loco::Node *> &roots);
+
+/**
+ * @brief Enumerate all the nodes required to compute "roots"
+ */
+std::set<loco::Node *> active_nodes(const std::vector<loco::Node *> &roots);
+
+} // namespace loco
+
+#endif // __LOCO_IR_ALGORITHM_H__