/* Copyright 2015 The TensorFlow Authors. 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.
==============================================================================*/

// An optimization pass that performs common subexpression elimination.

#ifndef TENSORFLOW_CORE_GRAPH_OPTIMIZER_CSE_H_
#define TENSORFLOW_CORE_GRAPH_OPTIMIZER_CSE_H_

#include <sys/types.h>
#include "tensorflow/core/graph/graph.h"

namespace tensorflow {

// Perform common-subexpression elimination on the graph "*g".  If
// "consider_fn" is not nullptr, then only nodes for which
// consider_fn(node) returns true will be considered for combining
// during the common subexpression elimination.
//
// Returns true if and only if 'g' is mutated.
extern bool OptimizeCSE(Graph* g,
                        const std::function<bool(const Node*)>& consider_fn);

}  // namespace tensorflow

#endif  // TENSORFLOW_CORE_GRAPH_OPTIMIZER_CSE_H_