| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #include "register_allocator.h" |
| |
| #include "arch/x86/instruction_set_features_x86.h" |
| #include "base/arena_allocator.h" |
| #include "base/macros.h" |
| #include "builder.h" |
| #include "code_generator.h" |
| #include "code_generator_x86.h" |
| #include "dex/dex_file.h" |
| #include "dex/dex_file_types.h" |
| #include "dex/dex_instruction.h" |
| #include "driver/compiler_options.h" |
| #include "nodes.h" |
| #include "optimizing_unit_test.h" |
| #include "register_allocator_linear_scan.h" |
| #include "ssa_liveness_analysis.h" |
| #include "ssa_phi_elimination.h" |
| |
| namespace art HIDDEN { |
| |
| using Strategy = RegisterAllocator::Strategy; |
| |
| // Note: the register allocator tests rely on the fact that constants have live |
| // intervals and registers get allocated to them. |
| |
| class RegisterAllocatorTest : public CommonCompilerTest, public OptimizingUnitTestHelper { |
| protected: |
| void SetUp() override { |
| CommonCompilerTest::SetUp(); |
| // This test is using the x86 ISA. |
| compiler_options_ = CommonCompilerTest::CreateCompilerOptions(InstructionSet::kX86, "default"); |
| } |
| |
| // These functions need to access private variables of LocationSummary, so we declare it |
| // as a member of RegisterAllocatorTest, which we make a friend class. |
| void SameAsFirstInputHint(Strategy strategy); |
| void ExpectedInRegisterHint(Strategy strategy); |
| |
| // Helper functions that make use of the OptimizingUnitTest's members. |
| bool Check(const std::vector<uint16_t>& data, Strategy strategy); |
| void CFG1(Strategy strategy); |
| void Loop1(Strategy strategy); |
| void Loop2(Strategy strategy); |
| void Loop3(Strategy strategy); |
| void DeadPhi(Strategy strategy); |
| HGraph* BuildIfElseWithPhi(HPhi** phi, HInstruction** input1, HInstruction** input2); |
| void PhiHint(Strategy strategy); |
| HGraph* BuildFieldReturn(HInstruction** field, HInstruction** ret); |
| HGraph* BuildTwoSubs(HInstruction** first_sub, HInstruction** second_sub); |
| HGraph* BuildDiv(HInstruction** div); |
| void ExpectedExactInRegisterAndSameOutputHint(Strategy strategy); |
| |
| bool ValidateIntervals(const ScopedArenaVector<LiveInterval*>& intervals, |
| const CodeGenerator& codegen) { |
| return RegisterAllocator::ValidateIntervals(ArrayRef<LiveInterval* const>(intervals), |
| /* number_of_spill_slots= */ 0u, |
| /* number_of_out_slots= */ 0u, |
| codegen, |
| /*liveness=*/ nullptr, |
| RegisterAllocator::RegisterType::kCoreRegister, |
| /* log_fatal_on_failure= */ false); |
| } |
| |
| std::unique_ptr<CompilerOptions> compiler_options_; |
| }; |
| |
| // This macro should include all register allocation strategies that should be tested. |
| #define TEST_ALL_STRATEGIES(test_name)\ |
| TEST_F(RegisterAllocatorTest, test_name##_LinearScan) {\ |
| test_name(Strategy::kRegisterAllocatorLinearScan);\ |
| }\ |
| /* Note: Graph coloring register allocator has been removed, so the test is DISABLED. */ \ |
| TEST_F(RegisterAllocatorTest, DISABLED_##test_name##_GraphColor) {\ |
| test_name(Strategy::kRegisterAllocatorGraphColor);\ |
| } |
| |
| bool RegisterAllocatorTest::Check(const std::vector<uint16_t>& data, Strategy strategy) { |
| HGraph* graph = CreateCFG(data); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| return register_allocator->Validate(false); |
| } |
| |
| /** |
| * Unit testing of RegisterAllocator::ValidateIntervals. Register allocator |
| * tests are based on this validation method. |
| */ |
| TEST_F(RegisterAllocatorTest, ValidateIntervals) { |
| HGraph* graph = CreateGraph(); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| ScopedArenaVector<LiveInterval*> intervals(GetScopedAllocator()->Adapter()); |
| |
| // Test with two intervals of the same range. |
| { |
| static constexpr size_t ranges[][2] = {{0, 42}}; |
| intervals.push_back(BuildInterval(ranges, arraysize(ranges), GetScopedAllocator(), 0)); |
| intervals.push_back(BuildInterval(ranges, arraysize(ranges), GetScopedAllocator(), 1)); |
| ASSERT_TRUE(ValidateIntervals(intervals, codegen)); |
| |
| intervals[1]->SetRegister(0); |
| ASSERT_FALSE(ValidateIntervals(intervals, codegen)); |
| intervals.clear(); |
| } |
| |
| // Test with two non-intersecting intervals. |
| { |
| static constexpr size_t ranges1[][2] = {{0, 42}}; |
| intervals.push_back(BuildInterval(ranges1, arraysize(ranges1), GetScopedAllocator(), 0)); |
| static constexpr size_t ranges2[][2] = {{42, 43}}; |
| intervals.push_back(BuildInterval(ranges2, arraysize(ranges2), GetScopedAllocator(), 1)); |
| ASSERT_TRUE(ValidateIntervals(intervals, codegen)); |
| |
| intervals[1]->SetRegister(0); |
| ASSERT_TRUE(ValidateIntervals(intervals, codegen)); |
| intervals.clear(); |
| } |
| |
| // Test with two non-intersecting intervals, with one with a lifetime hole. |
| { |
| static constexpr size_t ranges1[][2] = {{0, 42}, {45, 48}}; |
| intervals.push_back(BuildInterval(ranges1, arraysize(ranges1), GetScopedAllocator(), 0)); |
| static constexpr size_t ranges2[][2] = {{42, 43}}; |
| intervals.push_back(BuildInterval(ranges2, arraysize(ranges2), GetScopedAllocator(), 1)); |
| ASSERT_TRUE(ValidateIntervals(intervals, codegen)); |
| |
| intervals[1]->SetRegister(0); |
| ASSERT_TRUE(ValidateIntervals(intervals, codegen)); |
| intervals.clear(); |
| } |
| |
| // Test with intersecting intervals. |
| { |
| static constexpr size_t ranges1[][2] = {{0, 42}, {44, 48}}; |
| intervals.push_back(BuildInterval(ranges1, arraysize(ranges1), GetScopedAllocator(), 0)); |
| static constexpr size_t ranges2[][2] = {{42, 47}}; |
| intervals.push_back(BuildInterval(ranges2, arraysize(ranges2), GetScopedAllocator(), 1)); |
| ASSERT_TRUE(ValidateIntervals(intervals, codegen)); |
| |
| intervals[1]->SetRegister(0); |
| ASSERT_FALSE(ValidateIntervals(intervals, codegen)); |
| intervals.clear(); |
| } |
| |
| // Test with siblings. |
| { |
| static constexpr size_t ranges1[][2] = {{0, 42}, {44, 48}}; |
| intervals.push_back(BuildInterval(ranges1, arraysize(ranges1), GetScopedAllocator(), 0)); |
| intervals[0]->SplitAt(43); |
| static constexpr size_t ranges2[][2] = {{42, 47}}; |
| intervals.push_back(BuildInterval(ranges2, arraysize(ranges2), GetScopedAllocator(), 1)); |
| ASSERT_TRUE(ValidateIntervals(intervals, codegen)); |
| |
| intervals[1]->SetRegister(0); |
| // Sibling of the first interval has no register allocated to it. |
| ASSERT_TRUE(ValidateIntervals(intervals, codegen)); |
| |
| intervals[0]->GetNextSibling()->SetRegister(0); |
| ASSERT_FALSE(ValidateIntervals(intervals, codegen)); |
| } |
| } |
| |
| void RegisterAllocatorTest::CFG1(Strategy strategy) { |
| /* |
| * Test the following snippet: |
| * return 0; |
| * |
| * Which becomes the following graph: |
| * constant0 |
| * goto |
| * | |
| * return |
| * | |
| * exit |
| */ |
| const std::vector<uint16_t> data = ONE_REGISTER_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::RETURN); |
| |
| ASSERT_TRUE(Check(data, strategy)); |
| } |
| |
| TEST_ALL_STRATEGIES(CFG1); |
| |
| void RegisterAllocatorTest::Loop1(Strategy strategy) { |
| /* |
| * Test the following snippet: |
| * int a = 0; |
| * while (a == a) { |
| * a = 4; |
| * } |
| * return 5; |
| * |
| * Which becomes the following graph: |
| * constant0 |
| * constant4 |
| * constant5 |
| * goto |
| * | |
| * goto |
| * | |
| * phi |
| * equal |
| * if +++++ |
| * | \ + |
| * | goto |
| * | |
| * return |
| * | |
| * exit |
| */ |
| |
| const std::vector<uint16_t> data = TWO_REGISTERS_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::IF_EQ, 4, |
| Instruction::CONST_4 | 4 << 12 | 0, |
| Instruction::GOTO | 0xFD00, |
| Instruction::CONST_4 | 5 << 12 | 1 << 8, |
| Instruction::RETURN | 1 << 8); |
| |
| ASSERT_TRUE(Check(data, strategy)); |
| } |
| |
| TEST_ALL_STRATEGIES(Loop1); |
| |
| void RegisterAllocatorTest::Loop2(Strategy strategy) { |
| /* |
| * Test the following snippet: |
| * int a = 0; |
| * while (a == 8) { |
| * a = 4 + 5; |
| * } |
| * return 6 + 7; |
| * |
| * Which becomes the following graph: |
| * constant0 |
| * constant4 |
| * constant5 |
| * constant6 |
| * constant7 |
| * constant8 |
| * goto |
| * | |
| * goto |
| * | |
| * phi |
| * equal |
| * if +++++ |
| * | \ + |
| * | 4 + 5 |
| * | goto |
| * | |
| * 6 + 7 |
| * return |
| * | |
| * exit |
| */ |
| |
| const std::vector<uint16_t> data = TWO_REGISTERS_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::CONST_4 | 8 << 12 | 1 << 8, |
| Instruction::IF_EQ | 1 << 8, 7, |
| Instruction::CONST_4 | 4 << 12 | 0 << 8, |
| Instruction::CONST_4 | 5 << 12 | 1 << 8, |
| Instruction::ADD_INT, 1 << 8 | 0, |
| Instruction::GOTO | 0xFA00, |
| Instruction::CONST_4 | 6 << 12 | 1 << 8, |
| Instruction::CONST_4 | 7 << 12 | 1 << 8, |
| Instruction::ADD_INT, 1 << 8 | 0, |
| Instruction::RETURN | 1 << 8); |
| |
| ASSERT_TRUE(Check(data, strategy)); |
| } |
| |
| TEST_ALL_STRATEGIES(Loop2); |
| |
| void RegisterAllocatorTest::Loop3(Strategy strategy) { |
| /* |
| * Test the following snippet: |
| * int a = 0 |
| * do { |
| * b = a; |
| * a++; |
| * } while (a != 5) |
| * return b; |
| * |
| * Which becomes the following graph: |
| * constant0 |
| * constant1 |
| * constant5 |
| * goto |
| * | |
| * goto |
| * |++++++++++++ |
| * phi + |
| * a++ + |
| * equals + |
| * if + |
| * |++++++++++++ |
| * return |
| * | |
| * exit |
| */ |
| |
| const std::vector<uint16_t> data = THREE_REGISTERS_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::ADD_INT_LIT8 | 1 << 8, 1 << 8, |
| Instruction::CONST_4 | 5 << 12 | 2 << 8, |
| Instruction::IF_NE | 1 << 8 | 2 << 12, 3, |
| Instruction::RETURN | 0 << 8, |
| Instruction::MOVE | 1 << 12 | 0 << 8, |
| Instruction::GOTO | 0xF900); |
| |
| HGraph* graph = CreateCFG(data); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| ASSERT_TRUE(register_allocator->Validate(false)); |
| |
| HBasicBlock* loop_header = graph->GetBlocks()[2]; |
| HPhi* phi = loop_header->GetFirstPhi()->AsPhi(); |
| |
| LiveInterval* phi_interval = phi->GetLiveInterval(); |
| LiveInterval* loop_update = phi->InputAt(1)->GetLiveInterval(); |
| ASSERT_TRUE(phi_interval->HasRegister()); |
| ASSERT_TRUE(loop_update->HasRegister()); |
| ASSERT_NE(phi_interval->GetRegister(), loop_update->GetRegister()); |
| |
| HBasicBlock* return_block = graph->GetBlocks()[3]; |
| HReturn* ret = return_block->GetLastInstruction()->AsReturn(); |
| ASSERT_EQ(phi_interval->GetRegister(), ret->InputAt(0)->GetLiveInterval()->GetRegister()); |
| } |
| |
| TEST_ALL_STRATEGIES(Loop3); |
| |
| TEST_F(RegisterAllocatorTest, FirstRegisterUse) { |
| const std::vector<uint16_t> data = THREE_REGISTERS_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::XOR_INT_LIT8 | 1 << 8, 1 << 8, |
| Instruction::XOR_INT_LIT8 | 0 << 8, 1 << 8, |
| Instruction::XOR_INT_LIT8 | 1 << 8, 1 << 8 | 1, |
| Instruction::RETURN_VOID); |
| |
| HGraph* graph = CreateCFG(data); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| HXor* first_xor = graph->GetBlocks()[1]->GetFirstInstruction()->AsXor(); |
| HXor* last_xor = graph->GetBlocks()[1]->GetLastInstruction()->GetPrevious()->AsXor(); |
| ASSERT_EQ(last_xor->InputAt(0), first_xor); |
| LiveInterval* interval = first_xor->GetLiveInterval(); |
| ASSERT_EQ(interval->GetEnd(), last_xor->GetLifetimePosition()); |
| ASSERT_TRUE(interval->GetNextSibling() == nullptr); |
| |
| // We need a register for the output of the instruction. |
| ASSERT_EQ(interval->FirstRegisterUse(), first_xor->GetLifetimePosition()); |
| |
| // Split at the next instruction. |
| interval = interval->SplitAt(first_xor->GetLifetimePosition() + 2); |
| // The user of the split is the last add. |
| ASSERT_EQ(interval->FirstRegisterUse(), last_xor->GetLifetimePosition()); |
| |
| // Split before the last add. |
| LiveInterval* new_interval = interval->SplitAt(last_xor->GetLifetimePosition() - 1); |
| // Ensure the current interval has no register use... |
| ASSERT_EQ(interval->FirstRegisterUse(), kNoLifetime); |
| // And the new interval has it for the last add. |
| ASSERT_EQ(new_interval->FirstRegisterUse(), last_xor->GetLifetimePosition()); |
| } |
| |
| void RegisterAllocatorTest::DeadPhi(Strategy strategy) { |
| /* Test for a dead loop phi taking as back-edge input a phi that also has |
| * this loop phi as input. Walking backwards in SsaDeadPhiElimination |
| * does not solve the problem because the loop phi will be visited last. |
| * |
| * Test the following snippet: |
| * int a = 0 |
| * do { |
| * if (true) { |
| * a = 2; |
| * } |
| * } while (true); |
| */ |
| |
| const std::vector<uint16_t> data = TWO_REGISTERS_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::CONST_4 | 1 << 8 | 0, |
| Instruction::IF_NE | 1 << 8 | 1 << 12, 3, |
| Instruction::CONST_4 | 2 << 12 | 0 << 8, |
| Instruction::GOTO | 0xFD00, |
| Instruction::RETURN_VOID); |
| |
| HGraph* graph = CreateCFG(data); |
| SsaDeadPhiElimination(graph).Run(); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| ASSERT_TRUE(register_allocator->Validate(false)); |
| } |
| |
| TEST_ALL_STRATEGIES(DeadPhi); |
| |
| /** |
| * Test that the TryAllocateFreeReg method works in the presence of inactive intervals |
| * that share the same register. It should split the interval it is currently |
| * allocating for at the minimum lifetime position between the two inactive intervals. |
| * This test only applies to the linear scan allocator. |
| */ |
| TEST_F(RegisterAllocatorTest, FreeUntil) { |
| const std::vector<uint16_t> data = TWO_REGISTERS_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::RETURN); |
| |
| HGraph* graph = CreateCFG(data); |
| SsaDeadPhiElimination(graph).Run(); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| RegisterAllocatorLinearScan register_allocator(GetScopedAllocator(), &codegen, liveness); |
| |
| // Add an artifical range to cover the temps that will be put in the unhandled list. |
| LiveInterval* unhandled = graph->GetEntryBlock()->GetFirstInstruction()->GetLiveInterval(); |
| unhandled->AddLoopRange(0, 60); |
| |
| // Populate the instructions in the liveness object, to please the register allocator. |
| for (size_t i = 0; i < 60; ++i) { |
| liveness.instructions_from_lifetime_position_.push_back( |
| graph->GetEntryBlock()->GetFirstInstruction()); |
| } |
| |
| // For SSA value intervals, only an interval resulted from a split may intersect |
| // with inactive intervals. |
| unhandled = register_allocator.Split(unhandled, 5); |
| |
| // Add three temps holding the same register, and starting at different positions. |
| // Put the one that should be picked in the middle of the inactive list to ensure |
| // we do not depend on an order. |
| LiveInterval* interval = |
| LiveInterval::MakeFixedInterval(GetScopedAllocator(), 0, DataType::Type::kInt32); |
| interval->AddRange(40, 50); |
| register_allocator.inactive_.push_back(interval); |
| |
| interval = LiveInterval::MakeFixedInterval(GetScopedAllocator(), 0, DataType::Type::kInt32); |
| interval->AddRange(20, 30); |
| register_allocator.inactive_.push_back(interval); |
| |
| interval = LiveInterval::MakeFixedInterval(GetScopedAllocator(), 0, DataType::Type::kInt32); |
| interval->AddRange(60, 70); |
| register_allocator.inactive_.push_back(interval); |
| |
| register_allocator.number_of_registers_ = 1; |
| register_allocator.registers_array_ = GetAllocator()->AllocArray<size_t>(1); |
| register_allocator.current_register_type_ = RegisterAllocator::RegisterType::kCoreRegister; |
| register_allocator.unhandled_ = ®ister_allocator.unhandled_core_intervals_; |
| |
| ASSERT_TRUE(register_allocator.TryAllocateFreeReg(unhandled)); |
| |
| // Check that we have split the interval. |
| ASSERT_EQ(1u, register_allocator.unhandled_->size()); |
| // Check that we know need to find a new register where the next interval |
| // that uses the register starts. |
| ASSERT_EQ(20u, register_allocator.unhandled_->front()->GetStart()); |
| } |
| |
| HGraph* RegisterAllocatorTest::BuildIfElseWithPhi(HPhi** phi, |
| HInstruction** input1, |
| HInstruction** input2) { |
| HGraph* graph = CreateGraph(); |
| HBasicBlock* entry = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* parameter = new (GetAllocator()) HParameterValue( |
| graph->GetDexFile(), dex::TypeIndex(0), 0, DataType::Type::kReference); |
| entry->AddInstruction(parameter); |
| |
| HBasicBlock* block = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| |
| HInstruction* test = new (GetAllocator()) HInstanceFieldGet(parameter, |
| nullptr, |
| DataType::Type::kBool, |
| MemberOffset(22), |
| false, |
| kUnknownFieldIndex, |
| kUnknownClassDefIndex, |
| graph->GetDexFile(), |
| 0); |
| block->AddInstruction(test); |
| block->AddInstruction(new (GetAllocator()) HIf(test)); |
| HBasicBlock* then = new (GetAllocator()) HBasicBlock(graph); |
| HBasicBlock* else_ = new (GetAllocator()) HBasicBlock(graph); |
| HBasicBlock* join = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(then); |
| graph->AddBlock(else_); |
| graph->AddBlock(join); |
| |
| block->AddSuccessor(then); |
| block->AddSuccessor(else_); |
| then->AddSuccessor(join); |
| else_->AddSuccessor(join); |
| then->AddInstruction(new (GetAllocator()) HGoto()); |
| else_->AddInstruction(new (GetAllocator()) HGoto()); |
| |
| *phi = new (GetAllocator()) HPhi(GetAllocator(), 0, 0, DataType::Type::kInt32); |
| join->AddPhi(*phi); |
| *input1 = new (GetAllocator()) HInstanceFieldGet(parameter, |
| nullptr, |
| DataType::Type::kInt32, |
| MemberOffset(42), |
| false, |
| kUnknownFieldIndex, |
| kUnknownClassDefIndex, |
| graph->GetDexFile(), |
| 0); |
| *input2 = new (GetAllocator()) HInstanceFieldGet(parameter, |
| nullptr, |
| DataType::Type::kInt32, |
| MemberOffset(42), |
| false, |
| kUnknownFieldIndex, |
| kUnknownClassDefIndex, |
| graph->GetDexFile(), |
| 0); |
| then->AddInstruction(*input1); |
| else_->AddInstruction(*input2); |
| join->AddInstruction(new (GetAllocator()) HExit()); |
| (*phi)->AddInput(*input1); |
| (*phi)->AddInput(*input2); |
| |
| graph->BuildDominatorTree(); |
| graph->AnalyzeLoops(); |
| return graph; |
| } |
| |
| void RegisterAllocatorTest::PhiHint(Strategy strategy) { |
| HPhi *phi; |
| HInstruction *input1, *input2; |
| |
| { |
| HGraph* graph = BuildIfElseWithPhi(&phi, &input1, &input2); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| // Check that the register allocator is deterministic. |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| |
| ASSERT_EQ(input1->GetLiveInterval()->GetRegister(), 0); |
| ASSERT_EQ(input2->GetLiveInterval()->GetRegister(), 0); |
| ASSERT_EQ(phi->GetLiveInterval()->GetRegister(), 0); |
| } |
| |
| { |
| HGraph* graph = BuildIfElseWithPhi(&phi, &input1, &input2); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| // Set the phi to a specific register, and check that the inputs get allocated |
| // the same register. |
| phi->GetLocations()->UpdateOut(Location::RegisterLocation(2)); |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| |
| ASSERT_EQ(input1->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(input2->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(phi->GetLiveInterval()->GetRegister(), 2); |
| } |
| |
| { |
| HGraph* graph = BuildIfElseWithPhi(&phi, &input1, &input2); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| // Set input1 to a specific register, and check that the phi and other input get allocated |
| // the same register. |
| input1->GetLocations()->UpdateOut(Location::RegisterLocation(2)); |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| |
| ASSERT_EQ(input1->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(input2->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(phi->GetLiveInterval()->GetRegister(), 2); |
| } |
| |
| { |
| HGraph* graph = BuildIfElseWithPhi(&phi, &input1, &input2); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| // Set input2 to a specific register, and check that the phi and other input get allocated |
| // the same register. |
| input2->GetLocations()->UpdateOut(Location::RegisterLocation(2)); |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| |
| ASSERT_EQ(input1->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(input2->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(phi->GetLiveInterval()->GetRegister(), 2); |
| } |
| } |
| |
| // TODO: Enable this test for graph coloring register allocation when iterative move |
| // coalescing is merged. |
| TEST_F(RegisterAllocatorTest, PhiHint_LinearScan) { |
| PhiHint(Strategy::kRegisterAllocatorLinearScan); |
| } |
| |
| HGraph* RegisterAllocatorTest::BuildFieldReturn(HInstruction** field, HInstruction** ret) { |
| HGraph* graph = CreateGraph(); |
| HBasicBlock* entry = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* parameter = new (GetAllocator()) HParameterValue( |
| graph->GetDexFile(), dex::TypeIndex(0), 0, DataType::Type::kReference); |
| entry->AddInstruction(parameter); |
| |
| HBasicBlock* block = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| |
| *field = new (GetAllocator()) HInstanceFieldGet(parameter, |
| nullptr, |
| DataType::Type::kInt32, |
| MemberOffset(42), |
| false, |
| kUnknownFieldIndex, |
| kUnknownClassDefIndex, |
| graph->GetDexFile(), |
| 0); |
| block->AddInstruction(*field); |
| *ret = new (GetAllocator()) HReturn(*field); |
| block->AddInstruction(*ret); |
| |
| HBasicBlock* exit = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(exit); |
| block->AddSuccessor(exit); |
| exit->AddInstruction(new (GetAllocator()) HExit()); |
| |
| graph->BuildDominatorTree(); |
| return graph; |
| } |
| |
| void RegisterAllocatorTest::ExpectedInRegisterHint(Strategy strategy) { |
| HInstruction *field, *ret; |
| |
| { |
| HGraph* graph = BuildFieldReturn(&field, &ret); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| |
| // Check the validity that in normal conditions, the register should be hinted to 0 (EAX). |
| ASSERT_EQ(field->GetLiveInterval()->GetRegister(), 0); |
| } |
| |
| { |
| HGraph* graph = BuildFieldReturn(&field, &ret); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| // Check that the field gets put in the register expected by its use. |
| // Don't use SetInAt because we are overriding an already allocated location. |
| ret->GetLocations()->inputs_[0] = Location::RegisterLocation(2); |
| |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| |
| ASSERT_EQ(field->GetLiveInterval()->GetRegister(), 2); |
| } |
| } |
| |
| // TODO: Enable this test for graph coloring register allocation when iterative move |
| // coalescing is merged. |
| TEST_F(RegisterAllocatorTest, ExpectedInRegisterHint_LinearScan) { |
| ExpectedInRegisterHint(Strategy::kRegisterAllocatorLinearScan); |
| } |
| |
| HGraph* RegisterAllocatorTest::BuildTwoSubs(HInstruction** first_sub, HInstruction** second_sub) { |
| HGraph* graph = CreateGraph(); |
| HBasicBlock* entry = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* parameter = new (GetAllocator()) HParameterValue( |
| graph->GetDexFile(), dex::TypeIndex(0), 0, DataType::Type::kInt32); |
| entry->AddInstruction(parameter); |
| |
| HInstruction* constant1 = graph->GetIntConstant(1); |
| HInstruction* constant2 = graph->GetIntConstant(2); |
| |
| HBasicBlock* block = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| |
| *first_sub = new (GetAllocator()) HSub(DataType::Type::kInt32, parameter, constant1); |
| block->AddInstruction(*first_sub); |
| *second_sub = new (GetAllocator()) HSub(DataType::Type::kInt32, *first_sub, constant2); |
| block->AddInstruction(*second_sub); |
| |
| block->AddInstruction(new (GetAllocator()) HExit()); |
| |
| graph->BuildDominatorTree(); |
| return graph; |
| } |
| |
| void RegisterAllocatorTest::SameAsFirstInputHint(Strategy strategy) { |
| HInstruction *first_sub, *second_sub; |
| |
| { |
| HGraph* graph = BuildTwoSubs(&first_sub, &second_sub); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| |
| // Check the validity that in normal conditions, the registers are the same. |
| ASSERT_EQ(first_sub->GetLiveInterval()->GetRegister(), 1); |
| ASSERT_EQ(second_sub->GetLiveInterval()->GetRegister(), 1); |
| } |
| |
| { |
| HGraph* graph = BuildTwoSubs(&first_sub, &second_sub); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| // check that both adds get the same register. |
| // Don't use UpdateOutput because output is already allocated. |
| first_sub->InputAt(0)->GetLocations()->output_ = Location::RegisterLocation(2); |
| ASSERT_EQ(first_sub->GetLocations()->Out().GetPolicy(), Location::kSameAsFirstInput); |
| ASSERT_EQ(second_sub->GetLocations()->Out().GetPolicy(), Location::kSameAsFirstInput); |
| |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| |
| ASSERT_EQ(first_sub->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(second_sub->GetLiveInterval()->GetRegister(), 2); |
| } |
| } |
| |
| // TODO: Enable this test for graph coloring register allocation when iterative move |
| // coalescing is merged. |
| TEST_F(RegisterAllocatorTest, SameAsFirstInputHint_LinearScan) { |
| SameAsFirstInputHint(Strategy::kRegisterAllocatorLinearScan); |
| } |
| |
| HGraph* RegisterAllocatorTest::BuildDiv(HInstruction** div) { |
| HGraph* graph = CreateGraph(); |
| HBasicBlock* entry = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* first = new (GetAllocator()) HParameterValue( |
| graph->GetDexFile(), dex::TypeIndex(0), 0, DataType::Type::kInt32); |
| HInstruction* second = new (GetAllocator()) HParameterValue( |
| graph->GetDexFile(), dex::TypeIndex(0), 0, DataType::Type::kInt32); |
| entry->AddInstruction(first); |
| entry->AddInstruction(second); |
| |
| HBasicBlock* block = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| |
| *div = new (GetAllocator()) HDiv( |
| DataType::Type::kInt32, first, second, 0); // don't care about dex_pc. |
| block->AddInstruction(*div); |
| |
| block->AddInstruction(new (GetAllocator()) HExit()); |
| |
| graph->BuildDominatorTree(); |
| return graph; |
| } |
| |
| void RegisterAllocatorTest::ExpectedExactInRegisterAndSameOutputHint(Strategy strategy) { |
| HInstruction *div; |
| HGraph* graph = BuildDiv(&div); |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| liveness.Analyze(); |
| |
| std::unique_ptr<RegisterAllocator> register_allocator = |
| RegisterAllocator::Create(GetScopedAllocator(), &codegen, liveness, strategy); |
| register_allocator->AllocateRegisters(); |
| |
| // div on x86 requires its first input in eax and the output be the same as the first input. |
| ASSERT_EQ(div->GetLiveInterval()->GetRegister(), 0); |
| } |
| |
| // TODO: Enable this test for graph coloring register allocation when iterative move |
| // coalescing is merged. |
| TEST_F(RegisterAllocatorTest, ExpectedExactInRegisterAndSameOutputHint_LinearScan) { |
| ExpectedExactInRegisterAndSameOutputHint(Strategy::kRegisterAllocatorLinearScan); |
| } |
| |
| // Test a bug in the register allocator, where allocating a blocked |
| // register would lead to spilling an inactive interval at the wrong |
| // position. |
| // This test only applies to the linear scan allocator. |
| TEST_F(RegisterAllocatorTest, SpillInactive) { |
| // Create a synthesized graph to please the register_allocator and |
| // ssa_liveness_analysis code. |
| HGraph* graph = CreateGraph(); |
| HBasicBlock* entry = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* one = new (GetAllocator()) HParameterValue( |
| graph->GetDexFile(), dex::TypeIndex(0), 0, DataType::Type::kInt32); |
| HInstruction* two = new (GetAllocator()) HParameterValue( |
| graph->GetDexFile(), dex::TypeIndex(0), 0, DataType::Type::kInt32); |
| HInstruction* three = new (GetAllocator()) HParameterValue( |
| graph->GetDexFile(), dex::TypeIndex(0), 0, DataType::Type::kInt32); |
| HInstruction* four = new (GetAllocator()) HParameterValue( |
| graph->GetDexFile(), dex::TypeIndex(0), 0, DataType::Type::kInt32); |
| entry->AddInstruction(one); |
| entry->AddInstruction(two); |
| entry->AddInstruction(three); |
| entry->AddInstruction(four); |
| |
| HBasicBlock* block = new (GetAllocator()) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| block->AddInstruction(new (GetAllocator()) HExit()); |
| |
| // We create a synthesized user requesting a register, to avoid just spilling the |
| // intervals. |
| HPhi* user = new (GetAllocator()) HPhi(GetAllocator(), 0, 1, DataType::Type::kInt32); |
| user->SetBlock(block); |
| user->AddInput(one); |
| LocationSummary* locations = new (GetAllocator()) LocationSummary(user, LocationSummary::kNoCall); |
| locations->SetInAt(0, Location::RequiresRegister()); |
| static constexpr size_t phi_ranges[][2] = {{20, 30}}; |
| BuildInterval(phi_ranges, arraysize(phi_ranges), GetScopedAllocator(), -1, user); |
| |
| // Create an interval with lifetime holes. |
| static constexpr size_t ranges1[][2] = {{0, 2}, {4, 6}, {8, 10}}; |
| LiveInterval* first = BuildInterval(ranges1, arraysize(ranges1), GetScopedAllocator(), -1, one); |
| first->uses_.push_front(*new (GetScopedAllocator()) UsePosition(user, 0u, 8)); |
| first->uses_.push_front(*new (GetScopedAllocator()) UsePosition(user, 0u, 7)); |
| first->uses_.push_front(*new (GetScopedAllocator()) UsePosition(user, 0u, 6)); |
| |
| locations = new (GetAllocator()) LocationSummary(first->GetDefinedBy(), LocationSummary::kNoCall); |
| locations->SetOut(Location::RequiresRegister()); |
| first = first->SplitAt(1); |
| |
| // Create an interval that conflicts with the next interval, to force the next |
| // interval to call `AllocateBlockedReg`. |
| static constexpr size_t ranges2[][2] = {{2, 4}}; |
| LiveInterval* second = BuildInterval(ranges2, arraysize(ranges2), GetScopedAllocator(), -1, two); |
| locations = |
| new (GetAllocator()) LocationSummary(second->GetDefinedBy(), LocationSummary::kNoCall); |
| locations->SetOut(Location::RequiresRegister()); |
| |
| // Create an interval that will lead to splitting the first interval. The bug occured |
| // by splitting at a wrong position, in this case at the next intersection between |
| // this interval and the first interval. We would have then put the interval with ranges |
| // "[0, 2(, [4, 6(" in the list of handled intervals, even though we haven't processed intervals |
| // before lifetime position 6 yet. |
| static constexpr size_t ranges3[][2] = {{2, 4}, {8, 10}}; |
| LiveInterval* third = BuildInterval(ranges3, arraysize(ranges3), GetScopedAllocator(), -1, three); |
| third->uses_.push_front(*new (GetScopedAllocator()) UsePosition(user, 0u, 8)); |
| third->uses_.push_front(*new (GetScopedAllocator()) UsePosition(user, 0u, 4)); |
| third->uses_.push_front(*new (GetScopedAllocator()) UsePosition(user, 0u, 3)); |
| locations = new (GetAllocator()) LocationSummary(third->GetDefinedBy(), LocationSummary::kNoCall); |
| locations->SetOut(Location::RequiresRegister()); |
| third = third->SplitAt(3); |
| |
| // Because the first part of the split interval was considered handled, this interval |
| // was free to allocate the same register, even though it conflicts with it. |
| static constexpr size_t ranges4[][2] = {{4, 6}}; |
| LiveInterval* fourth = BuildInterval(ranges4, arraysize(ranges4), GetScopedAllocator(), -1, four); |
| locations = |
| new (GetAllocator()) LocationSummary(fourth->GetDefinedBy(), LocationSummary::kNoCall); |
| locations->SetOut(Location::RequiresRegister()); |
| |
| x86::CodeGeneratorX86 codegen(graph, *compiler_options_); |
| SsaLivenessAnalysis liveness(graph, &codegen, GetScopedAllocator()); |
| // Populate the instructions in the liveness object, to please the register allocator. |
| for (size_t i = 0; i < 32; ++i) { |
| liveness.instructions_from_lifetime_position_.push_back(user); |
| } |
| |
| RegisterAllocatorLinearScan register_allocator(GetScopedAllocator(), &codegen, liveness); |
| register_allocator.unhandled_core_intervals_.push_back(fourth); |
| register_allocator.unhandled_core_intervals_.push_back(third); |
| register_allocator.unhandled_core_intervals_.push_back(second); |
| register_allocator.unhandled_core_intervals_.push_back(first); |
| |
| // Set just one register available to make all intervals compete for the same. |
| register_allocator.number_of_registers_ = 1; |
| register_allocator.registers_array_ = GetAllocator()->AllocArray<size_t>(1); |
| register_allocator.current_register_type_ = RegisterAllocator::RegisterType::kCoreRegister; |
| register_allocator.unhandled_ = ®ister_allocator.unhandled_core_intervals_; |
| register_allocator.LinearScan(); |
| |
| // Test that there is no conflicts between intervals. |
| ScopedArenaVector<LiveInterval*> intervals(GetScopedAllocator()->Adapter()); |
| intervals.push_back(first); |
| intervals.push_back(second); |
| intervals.push_back(third); |
| intervals.push_back(fourth); |
| ASSERT_TRUE(ValidateIntervals(intervals, codegen)); |
| } |
| |
| } // namespace art |