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// Copyright 2014 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_BACKEND_MOVE_OPTIMIZER_H_
#define V8_COMPILER_BACKEND_MOVE_OPTIMIZER_H_
#include "src/compiler/backend/instruction.h"
#include "src/globals.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
namespace compiler {
class V8_EXPORT_PRIVATE MoveOptimizer final {
public:
MoveOptimizer(Zone* local_zone, InstructionSequence* code);
void Run();
private:
using MoveOpVector = ZoneVector<MoveOperands*>;
using Instructions = ZoneVector<Instruction*>;
InstructionSequence* code() const { return code_; }
Zone* local_zone() const { return local_zone_; }
Zone* code_zone() const { return code()->zone(); }
MoveOpVector& local_vector() { return local_vector_; }
// Consolidate moves into the first gap.
void CompressGaps(Instruction* instr);
// Attempt to push down to the last instruction those moves that can.
void CompressBlock(InstructionBlock* block);
// Consolidate moves into the first gap.
void CompressMoves(ParallelMove* left, MoveOpVector* right);
// Push down those moves in the gap of from that do not change the
// semantics of the from instruction, nor the semantics of the moves
// that remain behind.
void MigrateMoves(Instruction* to, Instruction* from);
void RemoveClobberedDestinations(Instruction* instruction);
const Instruction* LastInstruction(const InstructionBlock* block) const;
// Consolidate common moves appearing across all predecessors of a block.
void OptimizeMerge(InstructionBlock* block);
void FinalizeMoves(Instruction* instr);
Zone* const local_zone_;
InstructionSequence* const code_;
MoveOpVector local_vector_;
// Reusable buffers for storing operand sets. We need at most two sets
// at any given time, so we create two buffers.
ZoneVector<InstructionOperand> operand_buffer1;
ZoneVector<InstructionOperand> operand_buffer2;
DISALLOW_COPY_AND_ASSIGN(MoveOptimizer);
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_BACKEND_MOVE_OPTIMIZER_H_
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