| /* |
| * 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 "builder.h" |
| #include "code_generator.h" |
| #include "code_generator_x86.h" |
| #include "dex_file.h" |
| #include "dex_instruction.h" |
| #include "driver/compiler_options.h" |
| #include "nodes.h" |
| #include "optimizing_unit_test.h" |
| #include "register_allocator.h" |
| #include "ssa_liveness_analysis.h" |
| #include "ssa_phi_elimination.h" |
| #include "utils/arena_allocator.h" |
| |
| #include "gtest/gtest.h" |
| |
| namespace art { |
| |
| // Note: the register allocator tests rely on the fact that constants have live |
| // intervals and registers get allocated to them. |
| |
| static bool Check(const uint16_t* data) { |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HGraphBuilder builder(&allocator); |
| const DexFile::CodeItem* item = reinterpret_cast<const DexFile::CodeItem*>(data); |
| HGraph* graph = builder.BuildGraph(*item); |
| graph->TryBuildingSsa(); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| return register_allocator.Validate(false); |
| } |
| |
| /** |
| * Unit testing of RegisterAllocator::ValidateIntervals. Register allocator |
| * tests are based on this validation method. |
| */ |
| TEST(RegisterAllocatorTest, ValidateIntervals) { |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HGraph* graph = new (&allocator) HGraph(&allocator); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| GrowableArray<LiveInterval*> intervals(&allocator, 0); |
| |
| // Test with two intervals of the same range. |
| { |
| static constexpr size_t ranges[][2] = {{0, 42}}; |
| intervals.Add(BuildInterval(ranges, arraysize(ranges), &allocator, 0)); |
| intervals.Add(BuildInterval(ranges, arraysize(ranges), &allocator, 1)); |
| ASSERT_TRUE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| |
| intervals.Get(1)->SetRegister(0); |
| ASSERT_FALSE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| intervals.Reset(); |
| } |
| |
| // Test with two non-intersecting intervals. |
| { |
| static constexpr size_t ranges1[][2] = {{0, 42}}; |
| intervals.Add(BuildInterval(ranges1, arraysize(ranges1), &allocator, 0)); |
| static constexpr size_t ranges2[][2] = {{42, 43}}; |
| intervals.Add(BuildInterval(ranges2, arraysize(ranges2), &allocator, 1)); |
| ASSERT_TRUE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| |
| intervals.Get(1)->SetRegister(0); |
| ASSERT_TRUE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| intervals.Reset(); |
| } |
| |
| // Test with two non-intersecting intervals, with one with a lifetime hole. |
| { |
| static constexpr size_t ranges1[][2] = {{0, 42}, {45, 48}}; |
| intervals.Add(BuildInterval(ranges1, arraysize(ranges1), &allocator, 0)); |
| static constexpr size_t ranges2[][2] = {{42, 43}}; |
| intervals.Add(BuildInterval(ranges2, arraysize(ranges2), &allocator, 1)); |
| ASSERT_TRUE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| |
| intervals.Get(1)->SetRegister(0); |
| ASSERT_TRUE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| intervals.Reset(); |
| } |
| |
| // Test with intersecting intervals. |
| { |
| static constexpr size_t ranges1[][2] = {{0, 42}, {44, 48}}; |
| intervals.Add(BuildInterval(ranges1, arraysize(ranges1), &allocator, 0)); |
| static constexpr size_t ranges2[][2] = {{42, 47}}; |
| intervals.Add(BuildInterval(ranges2, arraysize(ranges2), &allocator, 1)); |
| ASSERT_TRUE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| |
| intervals.Get(1)->SetRegister(0); |
| ASSERT_FALSE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| intervals.Reset(); |
| } |
| |
| // Test with siblings. |
| { |
| static constexpr size_t ranges1[][2] = {{0, 42}, {44, 48}}; |
| intervals.Add(BuildInterval(ranges1, arraysize(ranges1), &allocator, 0)); |
| intervals.Get(0)->SplitAt(43); |
| static constexpr size_t ranges2[][2] = {{42, 47}}; |
| intervals.Add(BuildInterval(ranges2, arraysize(ranges2), &allocator, 1)); |
| ASSERT_TRUE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| |
| intervals.Get(1)->SetRegister(0); |
| // Sibling of the first interval has no register allocated to it. |
| ASSERT_TRUE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| |
| intervals.Get(0)->GetNextSibling()->SetRegister(0); |
| ASSERT_FALSE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| } |
| } |
| |
| TEST(RegisterAllocatorTest, CFG1) { |
| /* |
| * Test the following snippet: |
| * return 0; |
| * |
| * Which becomes the following graph: |
| * constant0 |
| * goto |
| * | |
| * return |
| * | |
| * exit |
| */ |
| const uint16_t data[] = ONE_REGISTER_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::RETURN); |
| |
| ASSERT_TRUE(Check(data)); |
| } |
| |
| TEST(RegisterAllocatorTest, Loop1) { |
| /* |
| * 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 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)); |
| } |
| |
| TEST(RegisterAllocatorTest, Loop2) { |
| /* |
| * 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 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)); |
| } |
| |
| static HGraph* BuildSSAGraph(const uint16_t* data, ArenaAllocator* allocator) { |
| HGraphBuilder builder(allocator); |
| const DexFile::CodeItem* item = reinterpret_cast<const DexFile::CodeItem*>(data); |
| HGraph* graph = builder.BuildGraph(*item); |
| graph->TryBuildingSsa(); |
| return graph; |
| } |
| |
| TEST(RegisterAllocatorTest, Loop3) { |
| /* |
| * 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 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); |
| |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HGraph* graph = BuildSSAGraph(data, &allocator); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| ASSERT_TRUE(register_allocator.Validate(false)); |
| |
| HBasicBlock* loop_header = graph->GetBlocks().Get(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().Get(3); |
| HReturn* ret = return_block->GetLastInstruction()->AsReturn(); |
| ASSERT_EQ(phi_interval->GetRegister(), ret->InputAt(0)->GetLiveInterval()->GetRegister()); |
| } |
| |
| TEST(RegisterAllocatorTest, FirstRegisterUse) { |
| const uint16_t data[] = THREE_REGISTERS_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::ADD_INT_LIT8 | 1 << 8, 1 << 8, |
| Instruction::ADD_INT_LIT8 | 0 << 8, 1 << 8, |
| Instruction::ADD_INT_LIT8 | 1 << 8, 1 << 8 | 1, |
| Instruction::RETURN_VOID); |
| |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HGraph* graph = BuildSSAGraph(data, &allocator); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| |
| HAdd* first_add = graph->GetBlocks().Get(1)->GetFirstInstruction()->AsAdd(); |
| HAdd* last_add = graph->GetBlocks().Get(1)->GetLastInstruction()->GetPrevious()->AsAdd(); |
| ASSERT_EQ(last_add->InputAt(0), first_add); |
| LiveInterval* interval = first_add->GetLiveInterval(); |
| ASSERT_EQ(interval->GetEnd(), last_add->GetLifetimePosition()); |
| ASSERT_TRUE(interval->GetNextSibling() == nullptr); |
| |
| // We need a register for the output of the instruction. |
| ASSERT_EQ(interval->FirstRegisterUse(), first_add->GetLifetimePosition()); |
| |
| // Split at the next instruction. |
| interval = interval->SplitAt(first_add->GetLifetimePosition() + 2); |
| // The user of the split is the last add. |
| ASSERT_EQ(interval->FirstRegisterUse(), last_add->GetLifetimePosition()); |
| |
| // Split before the last add. |
| LiveInterval* new_interval = interval->SplitAt(last_add->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_add->GetLifetimePosition()); |
| } |
| |
| TEST(RegisterAllocatorTest, DeadPhi) { |
| /* 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 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); |
| |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HGraph* graph = BuildSSAGraph(data, &allocator); |
| SsaDeadPhiElimination(graph).Run(); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| ASSERT_TRUE(register_allocator.Validate(false)); |
| } |
| |
| /** |
| * 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. |
| */ |
| TEST(RegisterAllocatorTest, FreeUntil) { |
| const uint16_t data[] = TWO_REGISTERS_CODE_ITEM( |
| Instruction::CONST_4 | 0 | 0, |
| Instruction::RETURN); |
| |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HGraph* graph = BuildSSAGraph(data, &allocator); |
| SsaDeadPhiElimination(graph).Run(); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| RegisterAllocator register_allocator(&allocator, &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); |
| // 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::MakeInterval(&allocator, Primitive::kPrimInt); |
| interval->SetRegister(0); |
| interval->AddRange(40, 50); |
| register_allocator.inactive_.Add(interval); |
| |
| interval = LiveInterval::MakeInterval(&allocator, Primitive::kPrimInt); |
| interval->SetRegister(0); |
| interval->AddRange(20, 30); |
| register_allocator.inactive_.Add(interval); |
| |
| interval = LiveInterval::MakeInterval(&allocator, Primitive::kPrimInt); |
| interval->SetRegister(0); |
| interval->AddRange(60, 70); |
| register_allocator.inactive_.Add(interval); |
| |
| register_allocator.number_of_registers_ = 1; |
| register_allocator.registers_array_ = allocator.AllocArray<size_t>(1); |
| register_allocator.processing_core_registers_ = true; |
| 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_->Get(0)->GetStart()); |
| } |
| |
| static HGraph* BuildIfElseWithPhi(ArenaAllocator* allocator, |
| HPhi** phi, |
| HInstruction** input1, |
| HInstruction** input2) { |
| HGraph* graph = new (allocator) HGraph(allocator); |
| HBasicBlock* entry = new (allocator) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* parameter = new (allocator) HParameterValue(0, Primitive::kPrimNot); |
| entry->AddInstruction(parameter); |
| |
| HBasicBlock* block = new (allocator) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| |
| HInstruction* test = new (allocator) HInstanceFieldGet( |
| parameter, Primitive::kPrimBoolean, MemberOffset(22), false); |
| block->AddInstruction(test); |
| block->AddInstruction(new (allocator) HIf(test)); |
| HBasicBlock* then = new (allocator) HBasicBlock(graph); |
| HBasicBlock* else_ = new (allocator) HBasicBlock(graph); |
| HBasicBlock* join = new (allocator) 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 (allocator) HGoto()); |
| else_->AddInstruction(new (allocator) HGoto()); |
| |
| *phi = new (allocator) HPhi(allocator, 0, 0, Primitive::kPrimInt); |
| join->AddPhi(*phi); |
| *input1 = new (allocator) HInstanceFieldGet(parameter, Primitive::kPrimInt, |
| MemberOffset(42), false); |
| *input2 = new (allocator) HInstanceFieldGet(parameter, Primitive::kPrimInt, |
| MemberOffset(42), false); |
| then->AddInstruction(*input1); |
| else_->AddInstruction(*input2); |
| join->AddInstruction(new (allocator) HExit()); |
| (*phi)->AddInput(*input1); |
| (*phi)->AddInput(*input2); |
| |
| graph->BuildDominatorTree(); |
| graph->AnalyzeNaturalLoops(); |
| return graph; |
| } |
| |
| TEST(RegisterAllocatorTest, PhiHint) { |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HPhi *phi; |
| HInstruction *input1, *input2; |
| |
| { |
| HGraph* graph = BuildIfElseWithPhi(&allocator, &phi, &input1, &input2); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| |
| // Check that the register allocator is deterministic. |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| |
| ASSERT_EQ(input1->GetLiveInterval()->GetRegister(), 0); |
| ASSERT_EQ(input2->GetLiveInterval()->GetRegister(), 0); |
| ASSERT_EQ(phi->GetLiveInterval()->GetRegister(), 0); |
| } |
| |
| { |
| HGraph* graph = BuildIfElseWithPhi(&allocator, &phi, &input1, &input2); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| |
| // Set the phi to a specific register, and check that the inputs get allocated |
| // the same register. |
| phi->GetLocations()->SetOut(Location::RegisterLocation(2)); |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| |
| ASSERT_EQ(input1->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(input2->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(phi->GetLiveInterval()->GetRegister(), 2); |
| } |
| |
| { |
| HGraph* graph = BuildIfElseWithPhi(&allocator, &phi, &input1, &input2); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| |
| // Set input1 to a specific register, and check that the phi and other input get allocated |
| // the same register. |
| input1->GetLocations()->SetOut(Location::RegisterLocation(2)); |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| |
| ASSERT_EQ(input1->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(input2->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(phi->GetLiveInterval()->GetRegister(), 2); |
| } |
| |
| { |
| HGraph* graph = BuildIfElseWithPhi(&allocator, &phi, &input1, &input2); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| |
| // Set input2 to a specific register, and check that the phi and other input get allocated |
| // the same register. |
| input2->GetLocations()->SetOut(Location::RegisterLocation(2)); |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| |
| ASSERT_EQ(input1->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(input2->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(phi->GetLiveInterval()->GetRegister(), 2); |
| } |
| } |
| |
| static HGraph* BuildFieldReturn(ArenaAllocator* allocator, |
| HInstruction** field, |
| HInstruction** ret) { |
| HGraph* graph = new (allocator) HGraph(allocator); |
| HBasicBlock* entry = new (allocator) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* parameter = new (allocator) HParameterValue(0, Primitive::kPrimNot); |
| entry->AddInstruction(parameter); |
| |
| HBasicBlock* block = new (allocator) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| |
| *field = new (allocator) HInstanceFieldGet(parameter, Primitive::kPrimInt, |
| MemberOffset(42), false); |
| block->AddInstruction(*field); |
| *ret = new (allocator) HReturn(*field); |
| block->AddInstruction(*ret); |
| |
| HBasicBlock* exit = new (allocator) HBasicBlock(graph); |
| graph->AddBlock(exit); |
| block->AddSuccessor(exit); |
| exit->AddInstruction(new (allocator) HExit()); |
| return graph; |
| } |
| |
| TEST(RegisterAllocatorTest, ExpectedInRegisterHint) { |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HInstruction *field, *ret; |
| |
| { |
| HGraph* graph = BuildFieldReturn(&allocator, &field, &ret); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| |
| // Sanity check that in normal conditions, the register should be hinted to 0 (EAX). |
| ASSERT_EQ(field->GetLiveInterval()->GetRegister(), 0); |
| } |
| |
| { |
| HGraph* graph = BuildFieldReturn(&allocator, &field, &ret); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| 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_.Put(0, Location::RegisterLocation(2)); |
| |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| |
| ASSERT_EQ(field->GetLiveInterval()->GetRegister(), 2); |
| } |
| } |
| |
| static HGraph* BuildTwoAdds(ArenaAllocator* allocator, |
| HInstruction** first_add, |
| HInstruction** second_add) { |
| HGraph* graph = new (allocator) HGraph(allocator); |
| HBasicBlock* entry = new (allocator) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* parameter = new (allocator) HParameterValue(0, Primitive::kPrimInt); |
| HInstruction* constant1 = new (allocator) HIntConstant(0); |
| HInstruction* constant2 = new (allocator) HIntConstant(0); |
| entry->AddInstruction(parameter); |
| entry->AddInstruction(constant1); |
| entry->AddInstruction(constant2); |
| |
| HBasicBlock* block = new (allocator) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| |
| *first_add = new (allocator) HAdd(Primitive::kPrimInt, parameter, constant1); |
| block->AddInstruction(*first_add); |
| *second_add = new (allocator) HAdd(Primitive::kPrimInt, *first_add, constant2); |
| block->AddInstruction(*second_add); |
| |
| block->AddInstruction(new (allocator) HExit()); |
| return graph; |
| } |
| |
| TEST(RegisterAllocatorTest, SameAsFirstInputHint) { |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HInstruction *first_add, *second_add; |
| |
| { |
| HGraph* graph = BuildTwoAdds(&allocator, &first_add, &second_add); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| |
| // Sanity check that in normal conditions, the registers are the same. |
| ASSERT_EQ(first_add->GetLiveInterval()->GetRegister(), 1); |
| ASSERT_EQ(second_add->GetLiveInterval()->GetRegister(), 1); |
| } |
| |
| { |
| HGraph* graph = BuildTwoAdds(&allocator, &first_add, &second_add); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| |
| // check that both adds get the same register. |
| // Don't use SetOutput because output is already allocated. |
| first_add->InputAt(0)->GetLocations()->output_ = Location::RegisterLocation(2); |
| ASSERT_EQ(first_add->GetLocations()->Out().GetPolicy(), Location::kSameAsFirstInput); |
| ASSERT_EQ(second_add->GetLocations()->Out().GetPolicy(), Location::kSameAsFirstInput); |
| |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.AllocateRegisters(); |
| |
| ASSERT_EQ(first_add->GetLiveInterval()->GetRegister(), 2); |
| ASSERT_EQ(second_add->GetLiveInterval()->GetRegister(), 2); |
| } |
| } |
| |
| static HGraph* BuildDiv(ArenaAllocator* allocator, |
| HInstruction** div) { |
| HGraph* graph = new (allocator) HGraph(allocator); |
| HBasicBlock* entry = new (allocator) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* first = new (allocator) HParameterValue(0, Primitive::kPrimInt); |
| HInstruction* second = new (allocator) HParameterValue(0, Primitive::kPrimInt); |
| entry->AddInstruction(first); |
| entry->AddInstruction(second); |
| |
| HBasicBlock* block = new (allocator) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| |
| *div = new (allocator) HDiv(Primitive::kPrimInt, first, second, 0); // don't care about dex_pc. |
| block->AddInstruction(*div); |
| |
| block->AddInstruction(new (allocator) HExit()); |
| return graph; |
| } |
| |
| TEST(RegisterAllocatorTest, ExpectedExactInRegisterAndSameOutputHint) { |
| ArenaPool pool; |
| ArenaAllocator allocator(&pool); |
| HInstruction *div; |
| |
| { |
| HGraph* graph = BuildDiv(&allocator, &div); |
| x86::CodeGeneratorX86 codegen(graph, CompilerOptions()); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| liveness.Analyze(); |
| |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| 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); |
| } |
| } |
| |
| // Test a bug in the register allocator, where allocating a blocked |
| // register would lead to spilling an inactive interval at the wrong |
| // position. |
| TEST(RegisterAllocatorTest, SpillInactive) { |
| ArenaPool pool; |
| |
| // Create a synthesized graph to please the register_allocator and |
| // ssa_liveness_analysis code. |
| ArenaAllocator allocator(&pool); |
| HGraph* graph = new (&allocator) HGraph(&allocator); |
| HBasicBlock* entry = new (&allocator) HBasicBlock(graph); |
| graph->AddBlock(entry); |
| graph->SetEntryBlock(entry); |
| HInstruction* one = new (&allocator) HParameterValue(0, Primitive::kPrimInt); |
| HInstruction* two = new (&allocator) HParameterValue(0, Primitive::kPrimInt); |
| HInstruction* three = new (&allocator) HParameterValue(0, Primitive::kPrimInt); |
| HInstruction* four = new (&allocator) HParameterValue(0, Primitive::kPrimInt); |
| entry->AddInstruction(one); |
| entry->AddInstruction(two); |
| entry->AddInstruction(three); |
| entry->AddInstruction(four); |
| |
| HBasicBlock* block = new (&allocator) HBasicBlock(graph); |
| graph->AddBlock(block); |
| entry->AddSuccessor(block); |
| block->AddInstruction(new (&allocator) HExit()); |
| |
| // We create a synthesized user requesting a register, to avoid just spilling the |
| // intervals. |
| HPhi* user = new (&allocator) HPhi(&allocator, 0, 1, Primitive::kPrimInt); |
| user->AddInput(one); |
| user->SetBlock(block); |
| LocationSummary* locations = new (&allocator) LocationSummary(user, LocationSummary::kNoCall); |
| locations->SetInAt(0, Location::RequiresRegister()); |
| static constexpr size_t phi_ranges[][2] = {{20, 30}}; |
| BuildInterval(phi_ranges, arraysize(phi_ranges), &allocator, -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), &allocator, -1, one); |
| first->first_use_ = new(&allocator) UsePosition(user, 0, false, 8, first->first_use_); |
| first->first_use_ = new(&allocator) UsePosition(user, 0, false, 7, first->first_use_); |
| first->first_use_ = new(&allocator) UsePosition(user, 0, false, 6, first->first_use_); |
| |
| locations = new (&allocator) 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), &allocator, -1, two); |
| locations = new (&allocator) 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), &allocator, -1, three); |
| third->first_use_ = new(&allocator) UsePosition(user, 0, false, 8, third->first_use_); |
| third->first_use_ = new(&allocator) UsePosition(user, 0, false, 4, third->first_use_); |
| third->first_use_ = new(&allocator) UsePosition(user, 0, false, 3, third->first_use_); |
| locations = new (&allocator) 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), &allocator, -1, four); |
| locations = new (&allocator) LocationSummary(fourth->GetDefinedBy(), LocationSummary::kNoCall); |
| locations->SetOut(Location::RequiresRegister()); |
| |
| x86::CodeGeneratorX86 codegen(graph); |
| SsaLivenessAnalysis liveness(*graph, &codegen); |
| |
| RegisterAllocator register_allocator(&allocator, &codegen, liveness); |
| register_allocator.unhandled_core_intervals_.Add(fourth); |
| register_allocator.unhandled_core_intervals_.Add(third); |
| register_allocator.unhandled_core_intervals_.Add(second); |
| register_allocator.unhandled_core_intervals_.Add(first); |
| |
| // Set just one register available to make all intervals compete for the same. |
| register_allocator.number_of_registers_ = 1; |
| register_allocator.registers_array_ = allocator.AllocArray<size_t>(1); |
| register_allocator.processing_core_registers_ = true; |
| register_allocator.unhandled_ = ®ister_allocator.unhandled_core_intervals_; |
| register_allocator.LinearScan(); |
| |
| // Test that there is no conflicts between intervals. |
| GrowableArray<LiveInterval*> intervals(&allocator, 0); |
| intervals.Add(first); |
| intervals.Add(second); |
| intervals.Add(third); |
| intervals.Add(fourth); |
| ASSERT_TRUE(RegisterAllocator::ValidateIntervals( |
| intervals, 0, 0, codegen, &allocator, true, false)); |
| } |
| |
| } // namespace art |