text: // Copyright 2020 Google LLC
  //
  // 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 XLS_PASSES_CONCAT_SIMPLIFICATION_PASS_H_
  #define XLS_PASSES_CONCAT_SIMPLIFICATION_PASS_H_
  
  #include "xls/common/status/statusor.h"
  #include "xls/ir/function.h"
  #include "xls/passes/passes.h"
  
  namespace xls {
  
  // Pass which simplifies concats. This includes removing single-operand concats,
  // flattening trees of dependent concats, and others.
  class ConcatSimplificationPass : public FunctionPass {
   public:
    ConcatSimplificationPass()
        : FunctionPass("concat_simp", "Concat simplification") {}
    ~ConcatSimplificationPass() override {}
  
    xabsl::StatusOr<bool> RunOnFunction(Function* f, const PassOptions& options,
                                        PassResults* results) const override;
  };
  
  }  // namespace xls
  
  #endif  // XLS_PASSES_CONCAT_SIMPLIFICATION_PASS_H_
  