68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/* Copyright 2017 The OpenXLA Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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#ifndef XLA_SERVICE_TUPLE_SIMPLIFIER_H_
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#define XLA_SERVICE_TUPLE_SIMPLIFIER_H_
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#include <utility>
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#include "xla/hlo/ir/hlo_instruction.h"
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#include "xla/hlo/ir/hlo_module.h"
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#include "xla/service/hlo_pass_interface.h"
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namespace xla {
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// A pass which simplifies patterns of Tuple and GetTupleElement instructions in
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// the module.
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class TupleSimplifier : public HloModulePass {
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public:
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TupleSimplifier() : TupleSimplifier(/*exclude_entry_computation=*/false) {}
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explicit TupleSimplifier(bool exclude_entry_computation);
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~TupleSimplifier() override {}
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absl::string_view name() const override { return "tuple-simplifier"; }
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// Run tuple simplification on the given computation. Returns whether the
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// computation was changed.
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using HloPassInterface::Run;
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using HloPassInterface::RunOnModuleGroup;
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StatusOr<bool> Run(
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HloModule* module,
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const absl::flat_hash_set<absl::string_view>& execution_threads) override;
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private:
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// When set, this pipeline stage will perform optimization of all computations
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// apart from the module's entry computation. This is used by Graphcore's
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// backend.
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bool exclude_entry_computation_;
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// Collapse the following structure into just 'Tuple-shaped Op':
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//
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// Tuple-shaped Op
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// |
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// +-----+-----+
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// | | |
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// GTE GTE GTE
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// | | |
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// +-----+-----+
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// |
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// Tuple
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//
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StatusOr<bool> RemoveWholeTuple(HloInstruction* tuple);
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};
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} // namespace xla
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#endif // XLA_SERVICE_TUPLE_SIMPLIFIER_H_
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