60 lines
2.3 KiB
C++
60 lines
2.3 KiB
C++
/* Copyright 2017 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.
|
|
==============================================================================*/
|
|
|
|
#ifndef TENSORFLOW_COMPILER_XLA_SERVICE_HLO_DCE_H_
|
|
#define TENSORFLOW_COMPILER_XLA_SERVICE_HLO_DCE_H_
|
|
|
|
#include "tensorflow/compiler/xla/service/hlo_computation.h"
|
|
#include "tensorflow/compiler/xla/service/hlo_instruction.h"
|
|
#include "tensorflow/compiler/xla/service/hlo_module.h"
|
|
#include "tensorflow/compiler/xla/service/hlo_pass_interface.h"
|
|
#include "tensorflow/compiler/xla/statusor.h"
|
|
|
|
namespace xla {
|
|
|
|
// HLO pass which removes dead instructions from each computation in the module
|
|
// and removes dead computations from the module.
|
|
//
|
|
// An instruction is dead if it is not reachable from the root. A computation is
|
|
// dead if it is not the entry computation of the module and it is not reachable
|
|
// from the entry computation.
|
|
//
|
|
// This pass does not remove dead parameter instructions, as parameter
|
|
// instructions cannot be deleted.
|
|
class HloDCE : public HloModulePass {
|
|
public:
|
|
HloDCE() : remove_cross_partition_collective_ops_(false) {}
|
|
explicit HloDCE(bool remove_cross_partition_collective_ops)
|
|
: remove_cross_partition_collective_ops_(
|
|
remove_cross_partition_collective_ops) {}
|
|
~HloDCE() override {}
|
|
absl::string_view name() const override { return "dce"; }
|
|
|
|
// Run DCE on a computation.
|
|
StatusOr<bool> RunOnComputation(HloComputation* computation,
|
|
bool remove_cross_partition_collective_ops);
|
|
|
|
// Run the pass on the given module. Returns whether the module was changed
|
|
// (instructions were removed).
|
|
StatusOr<bool> Run(HloModule* module) override;
|
|
|
|
private:
|
|
bool remove_cross_partition_collective_ops_;
|
|
};
|
|
|
|
} // namespace xla
|
|
|
|
#endif // TENSORFLOW_COMPILER_XLA_SERVICE_HLO_DCE_H_
|