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// Copyright 2019 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_COMPILER_DECOMPRESSION_ELIMINATION_H_ #define V8_COMPILER_DECOMPRESSION_ELIMINATION_H_ #include "src/compiler/common-operator.h" #include "src/compiler/graph-reducer.h" #include "src/compiler/graph.h" #include "src/compiler/machine-operator.h" namespace v8 { namespace internal { namespace compiler { // Performs elimination of redundant decompressions within the graph. class V8_EXPORT_PRIVATE DecompressionElimination final : public NON_EXPORTED_BASE(AdvancedReducer) { public: explicit DecompressionElimination(Editor* editor, Graph* graph, MachineOperatorBuilder* machine, CommonOperatorBuilder* common); ~DecompressionElimination() final = default; const char* reducer_name() const override { return "DecompressionElimination"; } Reduction Reduce(Node* node) final; private: // Returns true if the decompress opcode is valid for the compressed one. bool IsValidDecompress(IrOpcode::Value compressOpcode, IrOpcode::Value decompressOpcode); // Returns true if the constant opcode is a reducible one in decompression // elimination. bool IsReducibleConstantOpcode(IrOpcode::Value opcode); // Get the new 32 bit node constant given the 64 bit one. Node* GetCompressedConstant(Node* constant); // Removes direct Decompressions & Compressions, going from // Parent <- Decompression <- Compression <- Child // to // Parent <- Child // Can be used for Any, Signed, and Pointer compressions. Reduction ReduceCompress(Node* node); // Removes direct Compressions & Decompressions, analogously to ReduceCompress Reduction ReduceDecompress(Node* node); // Replaces Phi's input decompressions with their input node, if and only if // all of the Phi's inputs are Decompress nodes. Reduction ReducePhi(Node* node); // Replaces TypedStateValues's input decompressions with their input node. Reduction ReduceTypedStateValues(Node* node); // Replaces a Word64Equal with a Word32Equal if both of its inputs are // Decompress nodes, or if one is a Decompress node and the other a constant. // In the case of two decompresses, it uses the original inputs before they // are decompressed. In the case of having a constant, it uses the compressed // value of that constant. Reduction ReduceWord64Equal(Node* node); Graph* graph() const { return graph_; } MachineOperatorBuilder* machine() const { return machine_; } CommonOperatorBuilder* common() const { return common_; } Graph* const graph_; MachineOperatorBuilder* const machine_; CommonOperatorBuilder* const common_; }; } // namespace compiler } // namespace internal } // namespace v8 #endif // V8_COMPILER_DECOMPRESSION_ELIMINATION_H_