/*
 * Copyright (C) 2015 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 "code_generator_mips.h"

#include "arch/mips/entrypoints_direct_mips.h"
#include "arch/mips/instruction_set_features_mips.h"
#include "art_method.h"
#include "entrypoints/quick/quick_entrypoints.h"
#include "entrypoints/quick/quick_entrypoints_enum.h"
#include "gc/accounting/card_table.h"
#include "intrinsics.h"
#include "mirror/array-inl.h"
#include "mirror/class-inl.h"
#include "offsets.h"
#include "thread.h"
#include "utils/assembler.h"
#include "utils/mips/assembler_mips.h"
#include "utils/stack_checks.h"

namespace art {
namespace mips {

static constexpr int kCurrentMethodStackOffset = 0;
static constexpr Register kMethodRegisterArgument = A0;

// We need extra temporary/scratch registers (in addition to AT) in some cases.
static constexpr Register TMP = T8;
static constexpr FRegister FTMP = F8;

// ART Thread Register.
static constexpr Register TR = S1;

Location MipsReturnLocation(Primitive::Type return_type) {
  switch (return_type) {
    case Primitive::kPrimBoolean:
    case Primitive::kPrimByte:
    case Primitive::kPrimChar:
    case Primitive::kPrimShort:
    case Primitive::kPrimInt:
    case Primitive::kPrimNot:
      return Location::RegisterLocation(V0);

    case Primitive::kPrimLong:
      return Location::RegisterPairLocation(V0, V1);

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble:
      return Location::FpuRegisterLocation(F0);

    case Primitive::kPrimVoid:
      return Location();
  }
  UNREACHABLE();
}

Location InvokeDexCallingConventionVisitorMIPS::GetReturnLocation(Primitive::Type type) const {
  return MipsReturnLocation(type);
}

Location InvokeDexCallingConventionVisitorMIPS::GetMethodLocation() const {
  return Location::RegisterLocation(kMethodRegisterArgument);
}

Location InvokeDexCallingConventionVisitorMIPS::GetNextLocation(Primitive::Type type) {
  Location next_location;

  switch (type) {
    case Primitive::kPrimBoolean:
    case Primitive::kPrimByte:
    case Primitive::kPrimChar:
    case Primitive::kPrimShort:
    case Primitive::kPrimInt:
    case Primitive::kPrimNot: {
      uint32_t gp_index = gp_index_++;
      if (gp_index < calling_convention.GetNumberOfRegisters()) {
        next_location = Location::RegisterLocation(calling_convention.GetRegisterAt(gp_index));
      } else {
        size_t stack_offset = calling_convention.GetStackOffsetOf(stack_index_);
        next_location = Location::StackSlot(stack_offset);
      }
      break;
    }

    case Primitive::kPrimLong: {
      uint32_t gp_index = gp_index_;
      gp_index_ += 2;
      if (gp_index + 1 < calling_convention.GetNumberOfRegisters()) {
        if (calling_convention.GetRegisterAt(gp_index) == A1) {
          gp_index_++;  // Skip A1, and use A2_A3 instead.
          gp_index++;
        }
        Register low_even = calling_convention.GetRegisterAt(gp_index);
        Register high_odd = calling_convention.GetRegisterAt(gp_index + 1);
        DCHECK_EQ(low_even + 1, high_odd);
        next_location = Location::RegisterPairLocation(low_even, high_odd);
      } else {
        size_t stack_offset = calling_convention.GetStackOffsetOf(stack_index_);
        next_location = Location::DoubleStackSlot(stack_offset);
      }
      break;
    }

    // Note: both float and double types are stored in even FPU registers. On 32 bit FPU, double
    // will take up the even/odd pair, while floats are stored in even regs only.
    // On 64 bit FPU, both double and float are stored in even registers only.
    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble: {
      uint32_t float_index = float_index_++;
      if (float_index < calling_convention.GetNumberOfFpuRegisters()) {
        next_location = Location::FpuRegisterLocation(
            calling_convention.GetFpuRegisterAt(float_index));
      } else {
        size_t stack_offset = calling_convention.GetStackOffsetOf(stack_index_);
        next_location = Primitive::Is64BitType(type) ? Location::DoubleStackSlot(stack_offset)
                                                     : Location::StackSlot(stack_offset);
      }
      break;
    }

    case Primitive::kPrimVoid:
      LOG(FATAL) << "Unexpected parameter type " << type;
      break;
  }

  // Space on the stack is reserved for all arguments.
  stack_index_ += Primitive::Is64BitType(type) ? 2 : 1;

  return next_location;
}

Location InvokeRuntimeCallingConvention::GetReturnLocation(Primitive::Type type) {
  return MipsReturnLocation(type);
}

#define __ down_cast<CodeGeneratorMIPS*>(codegen)->GetAssembler()->
#define QUICK_ENTRY_POINT(x) QUICK_ENTRYPOINT_OFFSET(kMipsWordSize, x).Int32Value()

class BoundsCheckSlowPathMIPS : public SlowPathCodeMIPS {
 public:
  explicit BoundsCheckSlowPathMIPS(HBoundsCheck* instruction) : instruction_(instruction) {}

  void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
    LocationSummary* locations = instruction_->GetLocations();
    CodeGeneratorMIPS* mips_codegen = down_cast<CodeGeneratorMIPS*>(codegen);
    __ Bind(GetEntryLabel());
    if (instruction_->CanThrowIntoCatchBlock()) {
      // Live registers will be restored in the catch block if caught.
      SaveLiveRegisters(codegen, instruction_->GetLocations());
    }
    // We're moving two locations to locations that could overlap, so we need a parallel
    // move resolver.
    InvokeRuntimeCallingConvention calling_convention;
    codegen->EmitParallelMoves(locations->InAt(0),
                               Location::RegisterLocation(calling_convention.GetRegisterAt(0)),
                               Primitive::kPrimInt,
                               locations->InAt(1),
                               Location::RegisterLocation(calling_convention.GetRegisterAt(1)),
                               Primitive::kPrimInt);
    mips_codegen->InvokeRuntime(QUICK_ENTRY_POINT(pThrowArrayBounds),
                                instruction_,
                                instruction_->GetDexPc(),
                                this,
                                IsDirectEntrypoint(kQuickThrowArrayBounds));
    CheckEntrypointTypes<kQuickThrowArrayBounds, void, int32_t, int32_t>();
  }

  bool IsFatal() const OVERRIDE { return true; }

  const char* GetDescription() const OVERRIDE { return "BoundsCheckSlowPathMIPS"; }

 private:
  HBoundsCheck* const instruction_;

  DISALLOW_COPY_AND_ASSIGN(BoundsCheckSlowPathMIPS);
};

class DivZeroCheckSlowPathMIPS : public SlowPathCodeMIPS {
 public:
  explicit DivZeroCheckSlowPathMIPS(HDivZeroCheck* instruction) : instruction_(instruction) {}

  void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
    CodeGeneratorMIPS* mips_codegen = down_cast<CodeGeneratorMIPS*>(codegen);
    __ Bind(GetEntryLabel());
    if (instruction_->CanThrowIntoCatchBlock()) {
      // Live registers will be restored in the catch block if caught.
      SaveLiveRegisters(codegen, instruction_->GetLocations());
    }
    mips_codegen->InvokeRuntime(QUICK_ENTRY_POINT(pThrowDivZero),
                                instruction_,
                                instruction_->GetDexPc(),
                                this,
                                IsDirectEntrypoint(kQuickThrowDivZero));
    CheckEntrypointTypes<kQuickThrowDivZero, void, void>();
  }

  bool IsFatal() const OVERRIDE { return true; }

  const char* GetDescription() const OVERRIDE { return "DivZeroCheckSlowPathMIPS"; }

 private:
  HDivZeroCheck* const instruction_;
  DISALLOW_COPY_AND_ASSIGN(DivZeroCheckSlowPathMIPS);
};

class LoadClassSlowPathMIPS : public SlowPathCodeMIPS {
 public:
  LoadClassSlowPathMIPS(HLoadClass* cls,
                        HInstruction* at,
                        uint32_t dex_pc,
                        bool do_clinit)
      : cls_(cls), at_(at), dex_pc_(dex_pc), do_clinit_(do_clinit) {
    DCHECK(at->IsLoadClass() || at->IsClinitCheck());
  }

  void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
    LocationSummary* locations = at_->GetLocations();
    CodeGeneratorMIPS* mips_codegen = down_cast<CodeGeneratorMIPS*>(codegen);

    __ Bind(GetEntryLabel());
    SaveLiveRegisters(codegen, locations);

    InvokeRuntimeCallingConvention calling_convention;
    __ LoadConst32(calling_convention.GetRegisterAt(0), cls_->GetTypeIndex());

    int32_t entry_point_offset = do_clinit_ ? QUICK_ENTRY_POINT(pInitializeStaticStorage)
                                            : QUICK_ENTRY_POINT(pInitializeType);
    bool direct = do_clinit_ ? IsDirectEntrypoint(kQuickInitializeStaticStorage)
                             : IsDirectEntrypoint(kQuickInitializeType);

    mips_codegen->InvokeRuntime(entry_point_offset, at_, dex_pc_, this, direct);
    if (do_clinit_) {
      CheckEntrypointTypes<kQuickInitializeStaticStorage, void*, uint32_t>();
    } else {
      CheckEntrypointTypes<kQuickInitializeType, void*, uint32_t>();
    }

    // Move the class to the desired location.
    Location out = locations->Out();
    if (out.IsValid()) {
      DCHECK(out.IsRegister() && !locations->GetLiveRegisters()->ContainsCoreRegister(out.reg()));
      Primitive::Type type = at_->GetType();
      mips_codegen->MoveLocation(out, calling_convention.GetReturnLocation(type), type);
    }

    RestoreLiveRegisters(codegen, locations);
    __ B(GetExitLabel());
  }

  const char* GetDescription() const OVERRIDE { return "LoadClassSlowPathMIPS"; }

 private:
  // The class this slow path will load.
  HLoadClass* const cls_;

  // The instruction where this slow path is happening.
  // (Might be the load class or an initialization check).
  HInstruction* const at_;

  // The dex PC of `at_`.
  const uint32_t dex_pc_;

  // Whether to initialize the class.
  const bool do_clinit_;

  DISALLOW_COPY_AND_ASSIGN(LoadClassSlowPathMIPS);
};

class LoadStringSlowPathMIPS : public SlowPathCodeMIPS {
 public:
  explicit LoadStringSlowPathMIPS(HLoadString* instruction) : instruction_(instruction) {}

  void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
    LocationSummary* locations = instruction_->GetLocations();
    DCHECK(!locations->GetLiveRegisters()->ContainsCoreRegister(locations->Out().reg()));
    CodeGeneratorMIPS* mips_codegen = down_cast<CodeGeneratorMIPS*>(codegen);

    __ Bind(GetEntryLabel());
    SaveLiveRegisters(codegen, locations);

    InvokeRuntimeCallingConvention calling_convention;
    __ LoadConst32(calling_convention.GetRegisterAt(0), instruction_->GetStringIndex());
    mips_codegen->InvokeRuntime(QUICK_ENTRY_POINT(pResolveString),
                                instruction_,
                                instruction_->GetDexPc(),
                                this,
                                IsDirectEntrypoint(kQuickResolveString));
    CheckEntrypointTypes<kQuickResolveString, void*, uint32_t>();
    Primitive::Type type = instruction_->GetType();
    mips_codegen->MoveLocation(locations->Out(),
                               calling_convention.GetReturnLocation(type),
                               type);

    RestoreLiveRegisters(codegen, locations);
    __ B(GetExitLabel());
  }

  const char* GetDescription() const OVERRIDE { return "LoadStringSlowPathMIPS"; }

 private:
  HLoadString* const instruction_;

  DISALLOW_COPY_AND_ASSIGN(LoadStringSlowPathMIPS);
};

class NullCheckSlowPathMIPS : public SlowPathCodeMIPS {
 public:
  explicit NullCheckSlowPathMIPS(HNullCheck* instr) : instruction_(instr) {}

  void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
    CodeGeneratorMIPS* mips_codegen = down_cast<CodeGeneratorMIPS*>(codegen);
    __ Bind(GetEntryLabel());
    if (instruction_->CanThrowIntoCatchBlock()) {
      // Live registers will be restored in the catch block if caught.
      SaveLiveRegisters(codegen, instruction_->GetLocations());
    }
    mips_codegen->InvokeRuntime(QUICK_ENTRY_POINT(pThrowNullPointer),
                                instruction_,
                                instruction_->GetDexPc(),
                                this,
                                IsDirectEntrypoint(kQuickThrowNullPointer));
    CheckEntrypointTypes<kQuickThrowNullPointer, void, void>();
  }

  bool IsFatal() const OVERRIDE { return true; }

  const char* GetDescription() const OVERRIDE { return "NullCheckSlowPathMIPS"; }

 private:
  HNullCheck* const instruction_;

  DISALLOW_COPY_AND_ASSIGN(NullCheckSlowPathMIPS);
};

class SuspendCheckSlowPathMIPS : public SlowPathCodeMIPS {
 public:
  SuspendCheckSlowPathMIPS(HSuspendCheck* instruction, HBasicBlock* successor)
      : instruction_(instruction), successor_(successor) {}

  void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
    CodeGeneratorMIPS* mips_codegen = down_cast<CodeGeneratorMIPS*>(codegen);
    __ Bind(GetEntryLabel());
    SaveLiveRegisters(codegen, instruction_->GetLocations());
    mips_codegen->InvokeRuntime(QUICK_ENTRY_POINT(pTestSuspend),
                                instruction_,
                                instruction_->GetDexPc(),
                                this,
                                IsDirectEntrypoint(kQuickTestSuspend));
    CheckEntrypointTypes<kQuickTestSuspend, void, void>();
    RestoreLiveRegisters(codegen, instruction_->GetLocations());
    if (successor_ == nullptr) {
      __ B(GetReturnLabel());
    } else {
      __ B(mips_codegen->GetLabelOf(successor_));
    }
  }

  MipsLabel* GetReturnLabel() {
    DCHECK(successor_ == nullptr);
    return &return_label_;
  }

  const char* GetDescription() const OVERRIDE { return "SuspendCheckSlowPathMIPS"; }

 private:
  HSuspendCheck* const instruction_;
  // If not null, the block to branch to after the suspend check.
  HBasicBlock* const successor_;

  // If `successor_` is null, the label to branch to after the suspend check.
  MipsLabel return_label_;

  DISALLOW_COPY_AND_ASSIGN(SuspendCheckSlowPathMIPS);
};

class TypeCheckSlowPathMIPS : public SlowPathCodeMIPS {
 public:
  explicit TypeCheckSlowPathMIPS(HInstruction* instruction) : instruction_(instruction) {}

  void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
    LocationSummary* locations = instruction_->GetLocations();
    Location object_class = instruction_->IsCheckCast() ? locations->GetTemp(0) : locations->Out();
    uint32_t dex_pc = instruction_->GetDexPc();
    DCHECK(instruction_->IsCheckCast()
           || !locations->GetLiveRegisters()->ContainsCoreRegister(locations->Out().reg()));
    CodeGeneratorMIPS* mips_codegen = down_cast<CodeGeneratorMIPS*>(codegen);

    __ Bind(GetEntryLabel());
    SaveLiveRegisters(codegen, locations);

    // We're moving two locations to locations that could overlap, so we need a parallel
    // move resolver.
    InvokeRuntimeCallingConvention calling_convention;
    codegen->EmitParallelMoves(locations->InAt(1),
                               Location::RegisterLocation(calling_convention.GetRegisterAt(0)),
                               Primitive::kPrimNot,
                               object_class,
                               Location::RegisterLocation(calling_convention.GetRegisterAt(1)),
                               Primitive::kPrimNot);

    if (instruction_->IsInstanceOf()) {
      mips_codegen->InvokeRuntime(QUICK_ENTRY_POINT(pInstanceofNonTrivial),
                                  instruction_,
                                  dex_pc,
                                  this,
                                  IsDirectEntrypoint(kQuickInstanceofNonTrivial));
      Primitive::Type ret_type = instruction_->GetType();
      Location ret_loc = calling_convention.GetReturnLocation(ret_type);
      mips_codegen->MoveLocation(locations->Out(), ret_loc, ret_type);
      CheckEntrypointTypes<kQuickInstanceofNonTrivial,
                           uint32_t,
                           const mirror::Class*,
                           const mirror::Class*>();
    } else {
      DCHECK(instruction_->IsCheckCast());
      mips_codegen->InvokeRuntime(QUICK_ENTRY_POINT(pCheckCast),
                                  instruction_,
                                  dex_pc,
                                  this,
                                  IsDirectEntrypoint(kQuickCheckCast));
      CheckEntrypointTypes<kQuickCheckCast, void, const mirror::Class*, const mirror::Class*>();
    }

    RestoreLiveRegisters(codegen, locations);
    __ B(GetExitLabel());
  }

  const char* GetDescription() const OVERRIDE { return "TypeCheckSlowPathMIPS"; }

 private:
  HInstruction* const instruction_;

  DISALLOW_COPY_AND_ASSIGN(TypeCheckSlowPathMIPS);
};

class DeoptimizationSlowPathMIPS : public SlowPathCodeMIPS {
 public:
  explicit DeoptimizationSlowPathMIPS(HInstruction* instruction)
    : instruction_(instruction) {}

  void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
    __ Bind(GetEntryLabel());
    SaveLiveRegisters(codegen, instruction_->GetLocations());
    DCHECK(instruction_->IsDeoptimize());
    HDeoptimize* deoptimize = instruction_->AsDeoptimize();
    uint32_t dex_pc = deoptimize->GetDexPc();
    CodeGeneratorMIPS* mips_codegen = down_cast<CodeGeneratorMIPS*>(codegen);
    mips_codegen->InvokeRuntime(QUICK_ENTRY_POINT(pDeoptimize),
                                instruction_,
                                dex_pc,
                                this,
                                IsDirectEntrypoint(kQuickDeoptimize));
  }

  const char* GetDescription() const OVERRIDE { return "DeoptimizationSlowPathMIPS"; }

 private:
  HInstruction* const instruction_;
  DISALLOW_COPY_AND_ASSIGN(DeoptimizationSlowPathMIPS);
};

CodeGeneratorMIPS::CodeGeneratorMIPS(HGraph* graph,
                                     const MipsInstructionSetFeatures& isa_features,
                                     const CompilerOptions& compiler_options,
                                     OptimizingCompilerStats* stats)
    : CodeGenerator(graph,
                    kNumberOfCoreRegisters,
                    kNumberOfFRegisters,
                    kNumberOfRegisterPairs,
                    ComputeRegisterMask(reinterpret_cast<const int*>(kCoreCalleeSaves),
                                        arraysize(kCoreCalleeSaves)),
                    ComputeRegisterMask(reinterpret_cast<const int*>(kFpuCalleeSaves),
                                        arraysize(kFpuCalleeSaves)),
                    compiler_options,
                    stats),
      block_labels_(nullptr),
      location_builder_(graph, this),
      instruction_visitor_(graph, this),
      move_resolver_(graph->GetArena(), this),
      assembler_(&isa_features),
      isa_features_(isa_features) {
  // Save RA (containing the return address) to mimic Quick.
  AddAllocatedRegister(Location::RegisterLocation(RA));
}

#undef __
#define __ down_cast<MipsAssembler*>(GetAssembler())->
#define QUICK_ENTRY_POINT(x) QUICK_ENTRYPOINT_OFFSET(kMipsWordSize, x).Int32Value()

void CodeGeneratorMIPS::Finalize(CodeAllocator* allocator) {
  // Ensure that we fix up branches.
  __ FinalizeCode();

  // Adjust native pc offsets in stack maps.
  for (size_t i = 0, num = stack_map_stream_.GetNumberOfStackMaps(); i != num; ++i) {
    uint32_t old_position = stack_map_stream_.GetStackMap(i).native_pc_offset;
    uint32_t new_position = __ GetAdjustedPosition(old_position);
    DCHECK_GE(new_position, old_position);
    stack_map_stream_.SetStackMapNativePcOffset(i, new_position);
  }

  // Adjust pc offsets for the disassembly information.
  if (disasm_info_ != nullptr) {
    GeneratedCodeInterval* frame_entry_interval = disasm_info_->GetFrameEntryInterval();
    frame_entry_interval->start = __ GetAdjustedPosition(frame_entry_interval->start);
    frame_entry_interval->end = __ GetAdjustedPosition(frame_entry_interval->end);
    for (auto& it : *disasm_info_->GetInstructionIntervals()) {
      it.second.start = __ GetAdjustedPosition(it.second.start);
      it.second.end = __ GetAdjustedPosition(it.second.end);
    }
    for (auto& it : *disasm_info_->GetSlowPathIntervals()) {
      it.code_interval.start = __ GetAdjustedPosition(it.code_interval.start);
      it.code_interval.end = __ GetAdjustedPosition(it.code_interval.end);
    }
  }

  CodeGenerator::Finalize(allocator);
}

MipsAssembler* ParallelMoveResolverMIPS::GetAssembler() const {
  return codegen_->GetAssembler();
}

void ParallelMoveResolverMIPS::EmitMove(size_t index) {
  DCHECK_LT(index, moves_.size());
  MoveOperands* move = moves_[index];
  codegen_->MoveLocation(move->GetDestination(), move->GetSource(), move->GetType());
}

void ParallelMoveResolverMIPS::EmitSwap(size_t index) {
  DCHECK_LT(index, moves_.size());
  MoveOperands* move = moves_[index];
  Primitive::Type type = move->GetType();
  Location loc1 = move->GetDestination();
  Location loc2 = move->GetSource();

  DCHECK(!loc1.IsConstant());
  DCHECK(!loc2.IsConstant());

  if (loc1.Equals(loc2)) {
    return;
  }

  if (loc1.IsRegister() && loc2.IsRegister()) {
    // Swap 2 GPRs.
    Register r1 = loc1.AsRegister<Register>();
    Register r2 = loc2.AsRegister<Register>();
    __ Move(TMP, r2);
    __ Move(r2, r1);
    __ Move(r1, TMP);
  } else if (loc1.IsFpuRegister() && loc2.IsFpuRegister()) {
    FRegister f1 = loc1.AsFpuRegister<FRegister>();
    FRegister f2 = loc2.AsFpuRegister<FRegister>();
    if (type == Primitive::kPrimFloat) {
      __ MovS(FTMP, f2);
      __ MovS(f2, f1);
      __ MovS(f1, FTMP);
    } else {
      DCHECK_EQ(type, Primitive::kPrimDouble);
      __ MovD(FTMP, f2);
      __ MovD(f2, f1);
      __ MovD(f1, FTMP);
    }
  } else if ((loc1.IsRegister() && loc2.IsFpuRegister()) ||
             (loc1.IsFpuRegister() && loc2.IsRegister())) {
    // Swap FPR and GPR.
    DCHECK_EQ(type, Primitive::kPrimFloat);  // Can only swap a float.
    FRegister f1 = loc1.IsFpuRegister() ? loc1.AsFpuRegister<FRegister>()
                                        : loc2.AsFpuRegister<FRegister>();
    Register r2 = loc1.IsRegister() ? loc1.AsRegister<Register>()
                                    : loc2.AsRegister<Register>();
    __ Move(TMP, r2);
    __ Mfc1(r2, f1);
    __ Mtc1(TMP, f1);
  } else if (loc1.IsRegisterPair() && loc2.IsRegisterPair()) {
    // Swap 2 GPR register pairs.
    Register r1 = loc1.AsRegisterPairLow<Register>();
    Register r2 = loc2.AsRegisterPairLow<Register>();
    __ Move(TMP, r2);
    __ Move(r2, r1);
    __ Move(r1, TMP);
    r1 = loc1.AsRegisterPairHigh<Register>();
    r2 = loc2.AsRegisterPairHigh<Register>();
    __ Move(TMP, r2);
    __ Move(r2, r1);
    __ Move(r1, TMP);
  } else if ((loc1.IsRegisterPair() && loc2.IsFpuRegister()) ||
             (loc1.IsFpuRegister() && loc2.IsRegisterPair())) {
    // Swap FPR and GPR register pair.
    DCHECK_EQ(type, Primitive::kPrimDouble);
    FRegister f1 = loc1.IsFpuRegister() ? loc1.AsFpuRegister<FRegister>()
                                        : loc2.AsFpuRegister<FRegister>();
    Register r2_l = loc1.IsRegisterPair() ? loc1.AsRegisterPairLow<Register>()
                                          : loc2.AsRegisterPairLow<Register>();
    Register r2_h = loc1.IsRegisterPair() ? loc1.AsRegisterPairHigh<Register>()
                                          : loc2.AsRegisterPairHigh<Register>();
    // Use 2 temporary registers because we can't first swap the low 32 bits of an FPR and
    // then swap the high 32 bits of the same FPR. mtc1 makes the high 32 bits of an FPR
    // unpredictable and the following mfch1 will fail.
    __ Mfc1(TMP, f1);
    __ Mfhc1(AT, f1);
    __ Mtc1(r2_l, f1);
    __ Mthc1(r2_h, f1);
    __ Move(r2_l, TMP);
    __ Move(r2_h, AT);
  } else if (loc1.IsStackSlot() && loc2.IsStackSlot()) {
    Exchange(loc1.GetStackIndex(), loc2.GetStackIndex(), /* double_slot */ false);
  } else if (loc1.IsDoubleStackSlot() && loc2.IsDoubleStackSlot()) {
    Exchange(loc1.GetStackIndex(), loc2.GetStackIndex(), /* double_slot */ true);
  } else {
    LOG(FATAL) << "Swap between " << loc1 << " and " << loc2 << " is unsupported";
  }
}

void ParallelMoveResolverMIPS::RestoreScratch(int reg) {
  __ Pop(static_cast<Register>(reg));
}

void ParallelMoveResolverMIPS::SpillScratch(int reg) {
  __ Push(static_cast<Register>(reg));
}

void ParallelMoveResolverMIPS::Exchange(int index1, int index2, bool double_slot) {
  // Allocate a scratch register other than TMP, if available.
  // Else, spill V0 (arbitrary choice) and use it as a scratch register (it will be
  // automatically unspilled when the scratch scope object is destroyed).
  ScratchRegisterScope ensure_scratch(this, TMP, V0, codegen_->GetNumberOfCoreRegisters());
  // If V0 spills onto the stack, SP-relative offsets need to be adjusted.
  int stack_offset = ensure_scratch.IsSpilled() ? kMipsWordSize : 0;
  for (int i = 0; i <= (double_slot ? 1 : 0); i++, stack_offset += kMipsWordSize) {
    __ LoadFromOffset(kLoadWord,
                      Register(ensure_scratch.GetRegister()),
                      SP,
                      index1 + stack_offset);
    __ LoadFromOffset(kLoadWord,
                      TMP,
                      SP,
                      index2 + stack_offset);
    __ StoreToOffset(kStoreWord,
                     Register(ensure_scratch.GetRegister()),
                     SP,
                     index2 + stack_offset);
    __ StoreToOffset(kStoreWord, TMP, SP, index1 + stack_offset);
  }
}

static dwarf::Reg DWARFReg(Register reg) {
  return dwarf::Reg::MipsCore(static_cast<int>(reg));
}

// TODO: mapping of floating-point registers to DWARF.

void CodeGeneratorMIPS::GenerateFrameEntry() {
  __ Bind(&frame_entry_label_);

  bool do_overflow_check = FrameNeedsStackCheck(GetFrameSize(), kMips) || !IsLeafMethod();

  if (do_overflow_check) {
    __ LoadFromOffset(kLoadWord,
                      ZERO,
                      SP,
                      -static_cast<int32_t>(GetStackOverflowReservedBytes(kMips)));
    RecordPcInfo(nullptr, 0);
  }

  if (HasEmptyFrame()) {
    return;
  }

  // Make sure the frame size isn't unreasonably large.
  if (GetFrameSize() > GetStackOverflowReservedBytes(kMips)) {
    LOG(FATAL) << "Stack frame larger than " << GetStackOverflowReservedBytes(kMips) << " bytes";
  }

  // Spill callee-saved registers.
  // Note that their cumulative size is small and they can be indexed using
  // 16-bit offsets.

  // TODO: increment/decrement SP in one step instead of two or remove this comment.

  uint32_t ofs = FrameEntrySpillSize();
  bool unaligned_float = ofs & 0x7;
  bool fpu_32bit = isa_features_.Is32BitFloatingPoint();
  __ IncreaseFrameSize(ofs);

  for (int i = arraysize(kCoreCalleeSaves) - 1; i >= 0; --i) {
    Register reg = kCoreCalleeSaves[i];
    if (allocated_registers_.ContainsCoreRegister(reg)) {
      ofs -= kMipsWordSize;
      __ Sw(reg, SP, ofs);
      __ cfi().RelOffset(DWARFReg(reg), ofs);
    }
  }

  for (int i = arraysize(kFpuCalleeSaves) - 1; i >= 0; --i) {
    FRegister reg = kFpuCalleeSaves[i];
    if (allocated_registers_.ContainsFloatingPointRegister(reg)) {
      ofs -= kMipsDoublewordSize;
      // TODO: Change the frame to avoid unaligned accesses for fpu registers.
      if (unaligned_float) {
        if (fpu_32bit) {
          __ Swc1(reg, SP, ofs);
          __ Swc1(static_cast<FRegister>(reg + 1), SP, ofs + 4);
        } else {
          __ Mfhc1(TMP, reg);
          __ Swc1(reg, SP, ofs);
          __ Sw(TMP, SP, ofs + 4);
        }
      } else {
        __ Sdc1(reg, SP, ofs);
      }
      // TODO: __ cfi().RelOffset(DWARFReg(reg), ofs);
    }
  }

  // Allocate the rest of the frame and store the current method pointer
  // at its end.

  __ IncreaseFrameSize(GetFrameSize() - FrameEntrySpillSize());

  static_assert(IsInt<16>(kCurrentMethodStackOffset),
                "kCurrentMethodStackOffset must fit into int16_t");
  __ Sw(kMethodRegisterArgument, SP, kCurrentMethodStackOffset);
}

void CodeGeneratorMIPS::GenerateFrameExit() {
  __ cfi().RememberState();

  if (!HasEmptyFrame()) {
    // Deallocate the rest of the frame.

    __ DecreaseFrameSize(GetFrameSize() - FrameEntrySpillSize());

    // Restore callee-saved registers.
    // Note that their cumulative size is small and they can be indexed using
    // 16-bit offsets.

    // TODO: increment/decrement SP in one step instead of two or remove this comment.

    uint32_t ofs = 0;
    bool unaligned_float = FrameEntrySpillSize() & 0x7;
    bool fpu_32bit = isa_features_.Is32BitFloatingPoint();

    for (size_t i = 0; i < arraysize(kFpuCalleeSaves); ++i) {
      FRegister reg = kFpuCalleeSaves[i];
      if (allocated_registers_.ContainsFloatingPointRegister(reg)) {
        if (unaligned_float) {
          if (fpu_32bit) {
            __ Lwc1(reg, SP, ofs);
            __ Lwc1(static_cast<FRegister>(reg + 1), SP, ofs + 4);
          } else {
            __ Lwc1(reg, SP, ofs);
            __ Lw(TMP, SP, ofs + 4);
            __ Mthc1(TMP, reg);
          }
        } else {
          __ Ldc1(reg, SP, ofs);
        }
        ofs += kMipsDoublewordSize;
        // TODO: __ cfi().Restore(DWARFReg(reg));
      }
    }

    for (size_t i = 0; i < arraysize(kCoreCalleeSaves); ++i) {
      Register reg = kCoreCalleeSaves[i];
      if (allocated_registers_.ContainsCoreRegister(reg)) {
        __ Lw(reg, SP, ofs);
        ofs += kMipsWordSize;
        __ cfi().Restore(DWARFReg(reg));
      }
    }

    DCHECK_EQ(ofs, FrameEntrySpillSize());
    __ DecreaseFrameSize(ofs);
  }

  __ Jr(RA);
  __ Nop();

  __ cfi().RestoreState();
  __ cfi().DefCFAOffset(GetFrameSize());
}

void CodeGeneratorMIPS::Bind(HBasicBlock* block) {
  __ Bind(GetLabelOf(block));
}

void CodeGeneratorMIPS::MoveLocation(Location dst, Location src, Primitive::Type dst_type) {
  if (src.Equals(dst)) {
    return;
  }

  if (src.IsConstant()) {
    MoveConstant(dst, src.GetConstant());
  } else {
    if (Primitive::Is64BitType(dst_type)) {
      Move64(dst, src);
    } else {
      Move32(dst, src);
    }
  }
}

void CodeGeneratorMIPS::Move32(Location destination, Location source) {
  if (source.Equals(destination)) {
    return;
  }

  if (destination.IsRegister()) {
    if (source.IsRegister()) {
      __ Move(destination.AsRegister<Register>(), source.AsRegister<Register>());
    } else if (source.IsFpuRegister()) {
      __ Mfc1(destination.AsRegister<Register>(), source.AsFpuRegister<FRegister>());
    } else {
      DCHECK(source.IsStackSlot()) << "Cannot move from " << source << " to " << destination;
      __ LoadFromOffset(kLoadWord, destination.AsRegister<Register>(), SP, source.GetStackIndex());
    }
  } else if (destination.IsFpuRegister()) {
    if (source.IsRegister()) {
      __ Mtc1(source.AsRegister<Register>(), destination.AsFpuRegister<FRegister>());
    } else if (source.IsFpuRegister()) {
      __ MovS(destination.AsFpuRegister<FRegister>(), source.AsFpuRegister<FRegister>());
    } else {
      DCHECK(source.IsStackSlot()) << "Cannot move from " << source << " to " << destination;
      __ LoadSFromOffset(destination.AsFpuRegister<FRegister>(), SP, source.GetStackIndex());
    }
  } else {
    DCHECK(destination.IsStackSlot()) << destination;
    if (source.IsRegister()) {
      __ StoreToOffset(kStoreWord, source.AsRegister<Register>(), SP, destination.GetStackIndex());
    } else if (source.IsFpuRegister()) {
      __ StoreSToOffset(source.AsFpuRegister<FRegister>(), SP, destination.GetStackIndex());
    } else {
      DCHECK(source.IsStackSlot()) << "Cannot move from " << source << " to " << destination;
      __ LoadFromOffset(kLoadWord, TMP, SP, source.GetStackIndex());
      __ StoreToOffset(kStoreWord, TMP, SP, destination.GetStackIndex());
    }
  }
}

void CodeGeneratorMIPS::Move64(Location destination, Location source) {
  if (source.Equals(destination)) {
    return;
  }

  if (destination.IsRegisterPair()) {
    if (source.IsRegisterPair()) {
      __ Move(destination.AsRegisterPairHigh<Register>(), source.AsRegisterPairHigh<Register>());
      __ Move(destination.AsRegisterPairLow<Register>(), source.AsRegisterPairLow<Register>());
    } else if (source.IsFpuRegister()) {
      Register dst_high = destination.AsRegisterPairHigh<Register>();
      Register dst_low =  destination.AsRegisterPairLow<Register>();
      FRegister src = source.AsFpuRegister<FRegister>();
      __ Mfc1(dst_low, src);
      __ Mfhc1(dst_high, src);
    } else {
      DCHECK(source.IsDoubleStackSlot()) << "Cannot move from " << source << " to " << destination;
      int32_t off = source.GetStackIndex();
      Register r = destination.AsRegisterPairLow<Register>();
      __ LoadFromOffset(kLoadDoubleword, r, SP, off);
    }
  } else if (destination.IsFpuRegister()) {
    if (source.IsRegisterPair()) {
      FRegister dst = destination.AsFpuRegister<FRegister>();
      Register src_high = source.AsRegisterPairHigh<Register>();
      Register src_low = source.AsRegisterPairLow<Register>();
      __ Mtc1(src_low, dst);
      __ Mthc1(src_high, dst);
    } else if (source.IsFpuRegister()) {
      __ MovD(destination.AsFpuRegister<FRegister>(), source.AsFpuRegister<FRegister>());
    } else {
      DCHECK(source.IsDoubleStackSlot()) << "Cannot move from " << source << " to " << destination;
      __ LoadDFromOffset(destination.AsFpuRegister<FRegister>(), SP, source.GetStackIndex());
    }
  } else {
    DCHECK(destination.IsDoubleStackSlot()) << destination;
    int32_t off = destination.GetStackIndex();
    if (source.IsRegisterPair()) {
      __ StoreToOffset(kStoreDoubleword, source.AsRegisterPairLow<Register>(), SP, off);
    } else if (source.IsFpuRegister()) {
      __ StoreDToOffset(source.AsFpuRegister<FRegister>(), SP, off);
    } else {
      DCHECK(source.IsDoubleStackSlot()) << "Cannot move from " << source << " to " << destination;
      __ LoadFromOffset(kLoadWord, TMP, SP, source.GetStackIndex());
      __ StoreToOffset(kStoreWord, TMP, SP, off);
      __ LoadFromOffset(kLoadWord, TMP, SP, source.GetStackIndex() + 4);
      __ StoreToOffset(kStoreWord, TMP, SP, off + 4);
    }
  }
}

void CodeGeneratorMIPS::MoveConstant(Location destination, HConstant* c) {
  if (c->IsIntConstant() || c->IsNullConstant()) {
    // Move 32 bit constant.
    int32_t value = GetInt32ValueOf(c);
    if (destination.IsRegister()) {
      Register dst = destination.AsRegister<Register>();
      __ LoadConst32(dst, value);
    } else {
      DCHECK(destination.IsStackSlot())
          << "Cannot move " << c->DebugName() << " to " << destination;
      __ StoreConst32ToOffset(value, SP, destination.GetStackIndex(), TMP);
    }
  } else if (c->IsLongConstant()) {
    // Move 64 bit constant.
    int64_t value = GetInt64ValueOf(c);
    if (destination.IsRegisterPair()) {
      Register r_h = destination.AsRegisterPairHigh<Register>();
      Register r_l = destination.AsRegisterPairLow<Register>();
      __ LoadConst64(r_h, r_l, value);
    } else {
      DCHECK(destination.IsDoubleStackSlot())
          << "Cannot move " << c->DebugName() << " to " << destination;
      __ StoreConst64ToOffset(value, SP, destination.GetStackIndex(), TMP);
    }
  } else if (c->IsFloatConstant()) {
    // Move 32 bit float constant.
    int32_t value = GetInt32ValueOf(c);
    if (destination.IsFpuRegister()) {
      __ LoadSConst32(destination.AsFpuRegister<FRegister>(), value, TMP);
    } else {
      DCHECK(destination.IsStackSlot())
          << "Cannot move " << c->DebugName() << " to " << destination;
      __ StoreConst32ToOffset(value, SP, destination.GetStackIndex(), TMP);
    }
  } else {
    // Move 64 bit double constant.
    DCHECK(c->IsDoubleConstant()) << c->DebugName();
    int64_t value = GetInt64ValueOf(c);
    if (destination.IsFpuRegister()) {
      FRegister fd = destination.AsFpuRegister<FRegister>();
      __ LoadDConst64(fd, value, TMP);
    } else {
      DCHECK(destination.IsDoubleStackSlot())
          << "Cannot move " << c->DebugName() << " to " << destination;
      __ StoreConst64ToOffset(value, SP, destination.GetStackIndex(), TMP);
    }
  }
}

void CodeGeneratorMIPS::MoveConstant(Location destination, int32_t value) {
  DCHECK(destination.IsRegister());
  Register dst = destination.AsRegister<Register>();
  __ LoadConst32(dst, value);
}

void CodeGeneratorMIPS::Move(HInstruction* instruction,
                             Location location,
                             HInstruction* move_for) {
  LocationSummary* locations = instruction->GetLocations();
  Primitive::Type type = instruction->GetType();
  DCHECK_NE(type, Primitive::kPrimVoid);

  if (instruction->IsCurrentMethod()) {
    Move32(location, Location::StackSlot(kCurrentMethodStackOffset));
  } else if (locations != nullptr && locations->Out().Equals(location)) {
    return;
  } else if (instruction->IsIntConstant()
             || instruction->IsLongConstant()
             || instruction->IsNullConstant()) {
    MoveConstant(location, instruction->AsConstant());
  } else if (instruction->IsTemporary()) {
    Location temp_location = GetTemporaryLocation(instruction->AsTemporary());
    if (temp_location.IsStackSlot()) {
      Move32(location, temp_location);
    } else {
      DCHECK(temp_location.IsDoubleStackSlot());
      Move64(location, temp_location);
    }
  } else if (instruction->IsLoadLocal()) {
    uint32_t stack_slot = GetStackSlot(instruction->AsLoadLocal()->GetLocal());
    if (Primitive::Is64BitType(type)) {
      Move64(location, Location::DoubleStackSlot(stack_slot));
    } else {
      Move32(location, Location::StackSlot(stack_slot));
    }
  } else {
    DCHECK((instruction->GetNext() == move_for) || instruction->GetNext()->IsTemporary());
    if (Primitive::Is64BitType(type)) {
      Move64(location, locations->Out());
    } else {
      Move32(location, locations->Out());
    }
  }
}

void CodeGeneratorMIPS::AddLocationAsTemp(Location location, LocationSummary* locations) {
  if (location.IsRegister()) {
    locations->AddTemp(location);
  } else {
    UNIMPLEMENTED(FATAL) << "AddLocationAsTemp not implemented for location " << location;
  }
}

Location CodeGeneratorMIPS::GetStackLocation(HLoadLocal* load) const {
  Primitive::Type type = load->GetType();

  switch (type) {
    case Primitive::kPrimNot:
    case Primitive::kPrimInt:
    case Primitive::kPrimFloat:
      return Location::StackSlot(GetStackSlot(load->GetLocal()));

    case Primitive::kPrimLong:
    case Primitive::kPrimDouble:
      return Location::DoubleStackSlot(GetStackSlot(load->GetLocal()));

    case Primitive::kPrimBoolean:
    case Primitive::kPrimByte:
    case Primitive::kPrimChar:
    case Primitive::kPrimShort:
    case Primitive::kPrimVoid:
      LOG(FATAL) << "Unexpected type " << type;
  }

  LOG(FATAL) << "Unreachable";
  return Location::NoLocation();
}

void CodeGeneratorMIPS::MarkGCCard(Register object, Register value) {
  MipsLabel done;
  Register card = AT;
  Register temp = TMP;
  __ Beqz(value, &done);
  __ LoadFromOffset(kLoadWord,
                    card,
                    TR,
                    Thread::CardTableOffset<kMipsWordSize>().Int32Value());
  __ Srl(temp, object, gc::accounting::CardTable::kCardShift);
  __ Addu(temp, card, temp);
  __ Sb(card, temp, 0);
  __ Bind(&done);
}

void CodeGeneratorMIPS::SetupBlockedRegisters(bool is_baseline) const {
  // Don't allocate the dalvik style register pair passing.
  blocked_register_pairs_[A1_A2] = true;

  // ZERO, K0, K1, GP, SP, RA are always reserved and can't be allocated.
  blocked_core_registers_[ZERO] = true;
  blocked_core_registers_[K0] = true;
  blocked_core_registers_[K1] = true;
  blocked_core_registers_[GP] = true;
  blocked_core_registers_[SP] = true;
  blocked_core_registers_[RA] = true;

  // AT and TMP(T8) are used as temporary/scratch registers
  // (similar to how AT is used by MIPS assemblers).
  blocked_core_registers_[AT] = true;
  blocked_core_registers_[TMP] = true;
  blocked_fpu_registers_[FTMP] = true;

  // Reserve suspend and thread registers.
  blocked_core_registers_[S0] = true;
  blocked_core_registers_[TR] = true;

  // Reserve T9 for function calls
  blocked_core_registers_[T9] = true;

  // Reserve odd-numbered FPU registers.
  for (size_t i = 1; i < kNumberOfFRegisters; i += 2) {
    blocked_fpu_registers_[i] = true;
  }

  if (is_baseline) {
    for (size_t i = 0; i < arraysize(kCoreCalleeSaves); ++i) {
      blocked_core_registers_[kCoreCalleeSaves[i]] = true;
    }

    for (size_t i = 0; i < arraysize(kFpuCalleeSaves); ++i) {
      blocked_fpu_registers_[kFpuCalleeSaves[i]] = true;
    }
  }

  UpdateBlockedPairRegisters();
}

void CodeGeneratorMIPS::UpdateBlockedPairRegisters() const {
  for (int i = 0; i < kNumberOfRegisterPairs; i++) {
    MipsManagedRegister current =
        MipsManagedRegister::FromRegisterPair(static_cast<RegisterPair>(i));
    if (blocked_core_registers_[current.AsRegisterPairLow()]
        || blocked_core_registers_[current.AsRegisterPairHigh()]) {
      blocked_register_pairs_[i] = true;
    }
  }
}

Location CodeGeneratorMIPS::AllocateFreeRegister(Primitive::Type type) const {
  switch (type) {
    case Primitive::kPrimLong: {
      size_t reg = FindFreeEntry(blocked_register_pairs_, kNumberOfRegisterPairs);
      MipsManagedRegister pair =
          MipsManagedRegister::FromRegisterPair(static_cast<RegisterPair>(reg));
      DCHECK(!blocked_core_registers_[pair.AsRegisterPairLow()]);
      DCHECK(!blocked_core_registers_[pair.AsRegisterPairHigh()]);

      blocked_core_registers_[pair.AsRegisterPairLow()] = true;
      blocked_core_registers_[pair.AsRegisterPairHigh()] = true;
      UpdateBlockedPairRegisters();
      return Location::RegisterPairLocation(pair.AsRegisterPairLow(), pair.AsRegisterPairHigh());
    }

    case Primitive::kPrimByte:
    case Primitive::kPrimBoolean:
    case Primitive::kPrimChar:
    case Primitive::kPrimShort:
    case Primitive::kPrimInt:
    case Primitive::kPrimNot: {
      int reg = FindFreeEntry(blocked_core_registers_, kNumberOfCoreRegisters);
      // Block all register pairs that contain `reg`.
      for (int i = 0; i < kNumberOfRegisterPairs; i++) {
        MipsManagedRegister current =
            MipsManagedRegister::FromRegisterPair(static_cast<RegisterPair>(i));
        if (current.AsRegisterPairLow() == reg || current.AsRegisterPairHigh() == reg) {
          blocked_register_pairs_[i] = true;
        }
      }
      return Location::RegisterLocation(reg);
    }

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble: {
      int reg = FindFreeEntry(blocked_fpu_registers_, kNumberOfFRegisters);
      return Location::FpuRegisterLocation(reg);
    }

    case Primitive::kPrimVoid:
      LOG(FATAL) << "Unreachable type " << type;
  }

  UNREACHABLE();
}

size_t CodeGeneratorMIPS::SaveCoreRegister(size_t stack_index, uint32_t reg_id) {
  __ StoreToOffset(kStoreWord, Register(reg_id), SP, stack_index);
  return kMipsWordSize;
}

size_t CodeGeneratorMIPS::RestoreCoreRegister(size_t stack_index, uint32_t reg_id) {
  __ LoadFromOffset(kLoadWord, Register(reg_id), SP, stack_index);
  return kMipsWordSize;
}

size_t CodeGeneratorMIPS::SaveFloatingPointRegister(size_t stack_index, uint32_t reg_id) {
  __ StoreDToOffset(FRegister(reg_id), SP, stack_index);
  return kMipsDoublewordSize;
}

size_t CodeGeneratorMIPS::RestoreFloatingPointRegister(size_t stack_index, uint32_t reg_id) {
  __ LoadDFromOffset(FRegister(reg_id), SP, stack_index);
  return kMipsDoublewordSize;
}

void CodeGeneratorMIPS::DumpCoreRegister(std::ostream& stream, int reg) const {
  stream << MipsManagedRegister::FromCoreRegister(Register(reg));
}

void CodeGeneratorMIPS::DumpFloatingPointRegister(std::ostream& stream, int reg) const {
  stream << MipsManagedRegister::FromFRegister(FRegister(reg));
}

void CodeGeneratorMIPS::InvokeRuntime(QuickEntrypointEnum entrypoint,
                                      HInstruction* instruction,
                                      uint32_t dex_pc,
                                      SlowPathCode* slow_path) {
  InvokeRuntime(GetThreadOffset<kMipsWordSize>(entrypoint).Int32Value(),
                instruction,
                dex_pc,
                slow_path,
                IsDirectEntrypoint(entrypoint));
}

constexpr size_t kMipsDirectEntrypointRuntimeOffset = 16;

void CodeGeneratorMIPS::InvokeRuntime(int32_t entry_point_offset,
                                      HInstruction* instruction,
                                      uint32_t dex_pc,
                                      SlowPathCode* slow_path,
                                      bool is_direct_entrypoint) {
  if (is_direct_entrypoint) {
    // Reserve argument space on stack (for $a0-$a3) for
    // entrypoints that directly reference native implementations.
    // Called function may use this space to store $a0-$a3 regs.
    __ IncreaseFrameSize(kMipsDirectEntrypointRuntimeOffset);
  }
  __ LoadFromOffset(kLoadWord, T9, TR, entry_point_offset);
  __ Jalr(T9);
  __ Nop();
  if (is_direct_entrypoint) {
    __ DecreaseFrameSize(kMipsDirectEntrypointRuntimeOffset);
  }
  RecordPcInfo(instruction, dex_pc, slow_path);
}

void InstructionCodeGeneratorMIPS::GenerateClassInitializationCheck(SlowPathCodeMIPS* slow_path,
                                                                    Register class_reg) {
  __ LoadFromOffset(kLoadWord, TMP, class_reg, mirror::Class::StatusOffset().Int32Value());
  __ LoadConst32(AT, mirror::Class::kStatusInitialized);
  __ Blt(TMP, AT, slow_path->GetEntryLabel());
  // Even if the initialized flag is set, we need to ensure consistent memory ordering.
  __ Sync(0);
  __ Bind(slow_path->GetExitLabel());
}

void InstructionCodeGeneratorMIPS::GenerateMemoryBarrier(MemBarrierKind kind ATTRIBUTE_UNUSED) {
  __ Sync(0);  // Only stype 0 is supported.
}

void InstructionCodeGeneratorMIPS::GenerateSuspendCheck(HSuspendCheck* instruction,
                                                        HBasicBlock* successor) {
  SuspendCheckSlowPathMIPS* slow_path =
    new (GetGraph()->GetArena()) SuspendCheckSlowPathMIPS(instruction, successor);
  codegen_->AddSlowPath(slow_path);

  __ LoadFromOffset(kLoadUnsignedHalfword,
                    TMP,
                    TR,
                    Thread::ThreadFlagsOffset<kMipsWordSize>().Int32Value());
  if (successor == nullptr) {
    __ Bnez(TMP, slow_path->GetEntryLabel());
    __ Bind(slow_path->GetReturnLabel());
  } else {
    __ Beqz(TMP, codegen_->GetLabelOf(successor));
    __ B(slow_path->GetEntryLabel());
    // slow_path will return to GetLabelOf(successor).
  }
}

InstructionCodeGeneratorMIPS::InstructionCodeGeneratorMIPS(HGraph* graph,
                                                           CodeGeneratorMIPS* codegen)
      : HGraphVisitor(graph),
        assembler_(codegen->GetAssembler()),
        codegen_(codegen) {}

void LocationsBuilderMIPS::HandleBinaryOp(HBinaryOperation* instruction) {
  DCHECK_EQ(instruction->InputCount(), 2U);
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction);
  Primitive::Type type = instruction->GetResultType();
  switch (type) {
    case Primitive::kPrimInt: {
      locations->SetInAt(0, Location::RequiresRegister());
      HInstruction* right = instruction->InputAt(1);
      bool can_use_imm = false;
      if (right->IsConstant()) {
        int32_t imm = CodeGenerator::GetInt32ValueOf(right->AsConstant());
        if (instruction->IsAnd() || instruction->IsOr() || instruction->IsXor()) {
          can_use_imm = IsUint<16>(imm);
        } else if (instruction->IsAdd()) {
          can_use_imm = IsInt<16>(imm);
        } else {
          DCHECK(instruction->IsSub());
          can_use_imm = IsInt<16>(-imm);
        }
      }
      if (can_use_imm)
        locations->SetInAt(1, Location::ConstantLocation(right->AsConstant()));
      else
        locations->SetInAt(1, Location::RequiresRegister());
      locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
      break;
    }

    case Primitive::kPrimLong: {
      // TODO: can 2nd param be const?
      locations->SetInAt(0, Location::RequiresRegister());
      locations->SetInAt(1, Location::RequiresRegister());
      if (instruction->IsAdd() || instruction->IsSub()) {
        locations->SetOut(Location::RequiresRegister(), Location::kOutputOverlap);
      } else {
        DCHECK(instruction->IsAnd() || instruction->IsOr() || instruction->IsXor());
        locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
      }
      break;
    }

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble:
      DCHECK(instruction->IsAdd() || instruction->IsSub());
      locations->SetInAt(0, Location::RequiresFpuRegister());
      locations->SetInAt(1, Location::RequiresFpuRegister());
      locations->SetOut(Location::RequiresFpuRegister(), Location::kNoOutputOverlap);
      break;

    default:
      LOG(FATAL) << "Unexpected " << instruction->DebugName() << " type " << type;
  }
}

void InstructionCodeGeneratorMIPS::HandleBinaryOp(HBinaryOperation* instruction) {
  Primitive::Type type = instruction->GetType();
  LocationSummary* locations = instruction->GetLocations();

  switch (type) {
    case Primitive::kPrimInt: {
      Register dst = locations->Out().AsRegister<Register>();
      Register lhs = locations->InAt(0).AsRegister<Register>();
      Location rhs_location = locations->InAt(1);

      Register rhs_reg = ZERO;
      int32_t rhs_imm = 0;
      bool use_imm = rhs_location.IsConstant();
      if (use_imm) {
        rhs_imm = CodeGenerator::GetInt32ValueOf(rhs_location.GetConstant());
      } else {
        rhs_reg = rhs_location.AsRegister<Register>();
      }

      if (instruction->IsAnd()) {
        if (use_imm)
          __ Andi(dst, lhs, rhs_imm);
        else
          __ And(dst, lhs, rhs_reg);
      } else if (instruction->IsOr()) {
        if (use_imm)
          __ Ori(dst, lhs, rhs_imm);
        else
          __ Or(dst, lhs, rhs_reg);
      } else if (instruction->IsXor()) {
        if (use_imm)
          __ Xori(dst, lhs, rhs_imm);
        else
          __ Xor(dst, lhs, rhs_reg);
      } else if (instruction->IsAdd()) {
        if (use_imm)
          __ Addiu(dst, lhs, rhs_imm);
        else
          __ Addu(dst, lhs, rhs_reg);
      } else {
        DCHECK(instruction->IsSub());
        if (use_imm)
          __ Addiu(dst, lhs, -rhs_imm);
        else
          __ Subu(dst, lhs, rhs_reg);
      }
      break;
    }

    case Primitive::kPrimLong: {
      // TODO: can 2nd param be const?
      Register dst_high = locations->Out().AsRegisterPairHigh<Register>();
      Register dst_low = locations->Out().AsRegisterPairLow<Register>();
      Register lhs_high = locations->InAt(0).AsRegisterPairHigh<Register>();
      Register lhs_low = locations->InAt(0).AsRegisterPairLow<Register>();
      Register rhs_high = locations->InAt(1).AsRegisterPairHigh<Register>();
      Register rhs_low = locations->InAt(1).AsRegisterPairLow<Register>();

      if (instruction->IsAnd()) {
        __ And(dst_low, lhs_low, rhs_low);
        __ And(dst_high, lhs_high, rhs_high);
      } else if (instruction->IsOr()) {
        __ Or(dst_low, lhs_low, rhs_low);
        __ Or(dst_high, lhs_high, rhs_high);
      } else if (instruction->IsXor()) {
        __ Xor(dst_low, lhs_low, rhs_low);
        __ Xor(dst_high, lhs_high, rhs_high);
      } else if (instruction->IsAdd()) {
        __ Addu(dst_low, lhs_low, rhs_low);
        __ Sltu(TMP, dst_low, lhs_low);
        __ Addu(dst_high, lhs_high, rhs_high);
        __ Addu(dst_high, dst_high, TMP);
      } else {
        DCHECK(instruction->IsSub());
        __ Subu(dst_low, lhs_low, rhs_low);
        __ Sltu(TMP, lhs_low, dst_low);
        __ Subu(dst_high, lhs_high, rhs_high);
        __ Subu(dst_high, dst_high, TMP);
      }
      break;
    }

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble: {
      FRegister dst = locations->Out().AsFpuRegister<FRegister>();
      FRegister lhs = locations->InAt(0).AsFpuRegister<FRegister>();
      FRegister rhs = locations->InAt(1).AsFpuRegister<FRegister>();
      if (instruction->IsAdd()) {
        if (type == Primitive::kPrimFloat) {
          __ AddS(dst, lhs, rhs);
        } else {
          __ AddD(dst, lhs, rhs);
        }
      } else {
        DCHECK(instruction->IsSub());
        if (type == Primitive::kPrimFloat) {
          __ SubS(dst, lhs, rhs);
        } else {
          __ SubD(dst, lhs, rhs);
        }
      }
      break;
    }

    default:
      LOG(FATAL) << "Unexpected binary operation type " << type;
  }
}

void LocationsBuilderMIPS::HandleShift(HBinaryOperation* instr) {
  DCHECK(instr->IsShl() || instr->IsShr() || instr->IsUShr());

  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instr);
  Primitive::Type type = instr->GetResultType();
  switch (type) {
    case Primitive::kPrimInt:
    case Primitive::kPrimLong: {
      locations->SetInAt(0, Location::RequiresRegister());
      locations->SetInAt(1, Location::RegisterOrConstant(instr->InputAt(1)));
      locations->SetOut(Location::RequiresRegister());
      break;
    }
    default:
      LOG(FATAL) << "Unexpected shift type " << type;
  }
}

static constexpr size_t kMipsBitsPerWord = kMipsWordSize * kBitsPerByte;

void InstructionCodeGeneratorMIPS::HandleShift(HBinaryOperation* instr) {
  DCHECK(instr->IsShl() || instr->IsShr() || instr->IsUShr());
  LocationSummary* locations = instr->GetLocations();
  Primitive::Type type = instr->GetType();

  Location rhs_location = locations->InAt(1);
  bool use_imm = rhs_location.IsConstant();
  Register rhs_reg = use_imm ? ZERO : rhs_location.AsRegister<Register>();
  int64_t rhs_imm = use_imm ? CodeGenerator::GetInt64ValueOf(rhs_location.GetConstant()) : 0;
  uint32_t shift_mask = (type == Primitive::kPrimInt) ? kMaxIntShiftValue : kMaxLongShiftValue;
  uint32_t shift_value = rhs_imm & shift_mask;

  switch (type) {
    case Primitive::kPrimInt: {
      Register dst = locations->Out().AsRegister<Register>();
      Register lhs = locations->InAt(0).AsRegister<Register>();
      if (use_imm) {
        if (instr->IsShl()) {
          __ Sll(dst, lhs, shift_value);
        } else if (instr->IsShr()) {
          __ Sra(dst, lhs, shift_value);
        } else {
          __ Srl(dst, lhs, shift_value);
        }
      } else {
        if (instr->IsShl()) {
          __ Sllv(dst, lhs, rhs_reg);
        } else if (instr->IsShr()) {
          __ Srav(dst, lhs, rhs_reg);
        } else {
          __ Srlv(dst, lhs, rhs_reg);
        }
      }
      break;
    }

    case Primitive::kPrimLong: {
      Register dst_high = locations->Out().AsRegisterPairHigh<Register>();
      Register dst_low = locations->Out().AsRegisterPairLow<Register>();
      Register lhs_high = locations->InAt(0).AsRegisterPairHigh<Register>();
      Register lhs_low = locations->InAt(0).AsRegisterPairLow<Register>();
      if (use_imm) {
          if (shift_value == 0) {
            codegen_->Move64(locations->Out(), locations->InAt(0));
          } else if (shift_value < kMipsBitsPerWord) {
            if (instr->IsShl()) {
              __ Sll(dst_low, lhs_low, shift_value);
              __ Srl(TMP, lhs_low, kMipsBitsPerWord - shift_value);
              __ Sll(dst_high, lhs_high, shift_value);
              __ Or(dst_high, dst_high, TMP);
            } else if (instr->IsShr()) {
              __ Sra(dst_high, lhs_high, shift_value);
              __ Sll(TMP, lhs_high, kMipsBitsPerWord - shift_value);
              __ Srl(dst_low, lhs_low, shift_value);
              __ Or(dst_low, dst_low, TMP);
            } else {
              __ Srl(dst_high, lhs_high, shift_value);
              __ Sll(TMP, lhs_high, kMipsBitsPerWord - shift_value);
              __ Srl(dst_low, lhs_low, shift_value);
              __ Or(dst_low, dst_low, TMP);
            }
          } else {
            shift_value -= kMipsBitsPerWord;
            if (instr->IsShl()) {
              __ Sll(dst_high, lhs_low, shift_value);
              __ Move(dst_low, ZERO);
            } else if (instr->IsShr()) {
              __ Sra(dst_low, lhs_high, shift_value);
              __ Sra(dst_high, dst_low, kMipsBitsPerWord - 1);
            } else {
              __ Srl(dst_low, lhs_high, shift_value);
              __ Move(dst_high, ZERO);
            }
          }
      } else {
        MipsLabel done;
        if (instr->IsShl()) {
          __ Sllv(dst_low, lhs_low, rhs_reg);
          __ Nor(AT, ZERO, rhs_reg);
          __ Srl(TMP, lhs_low, 1);
          __ Srlv(TMP, TMP, AT);
          __ Sllv(dst_high, lhs_high, rhs_reg);
          __ Or(dst_high, dst_high, TMP);
          __ Andi(TMP, rhs_reg, kMipsBitsPerWord);
          __ Beqz(TMP, &done);
          __ Move(dst_high, dst_low);
          __ Move(dst_low, ZERO);
        } else if (instr->IsShr()) {
          __ Srav(dst_high, lhs_high, rhs_reg);
          __ Nor(AT, ZERO, rhs_reg);
          __ Sll(TMP, lhs_high, 1);
          __ Sllv(TMP, TMP, AT);
          __ Srlv(dst_low, lhs_low, rhs_reg);
          __ Or(dst_low, dst_low, TMP);
          __ Andi(TMP, rhs_reg, kMipsBitsPerWord);
          __ Beqz(TMP, &done);
          __ Move(dst_low, dst_high);
          __ Sra(dst_high, dst_high, 31);
        } else {
          __ Srlv(dst_high, lhs_high, rhs_reg);
          __ Nor(AT, ZERO, rhs_reg);
          __ Sll(TMP, lhs_high, 1);
          __ Sllv(TMP, TMP, AT);
          __ Srlv(dst_low, lhs_low, rhs_reg);
          __ Or(dst_low, dst_low, TMP);
          __ Andi(TMP, rhs_reg, kMipsBitsPerWord);
          __ Beqz(TMP, &done);
          __ Move(dst_low, dst_high);
          __ Move(dst_high, ZERO);
        }
        __ Bind(&done);
      }
      break;
    }

    default:
      LOG(FATAL) << "Unexpected shift operation type " << type;
  }
}

void LocationsBuilderMIPS::VisitAdd(HAdd* instruction) {
  HandleBinaryOp(instruction);
}

void InstructionCodeGeneratorMIPS::VisitAdd(HAdd* instruction) {
  HandleBinaryOp(instruction);
}

void LocationsBuilderMIPS::VisitAnd(HAnd* instruction) {
  HandleBinaryOp(instruction);
}

void InstructionCodeGeneratorMIPS::VisitAnd(HAnd* instruction) {
  HandleBinaryOp(instruction);
}

void LocationsBuilderMIPS::VisitArrayGet(HArrayGet* instruction) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kNoCall);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetInAt(1, Location::RegisterOrConstant(instruction->InputAt(1)));
  if (Primitive::IsFloatingPointType(instruction->GetType())) {
    locations->SetOut(Location::RequiresFpuRegister(), Location::kNoOutputOverlap);
  } else {
    locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
  }
}

void InstructionCodeGeneratorMIPS::VisitArrayGet(HArrayGet* instruction) {
  LocationSummary* locations = instruction->GetLocations();
  Register obj = locations->InAt(0).AsRegister<Register>();
  Location index = locations->InAt(1);
  Primitive::Type type = instruction->GetType();

  switch (type) {
    case Primitive::kPrimBoolean: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(uint8_t)).Uint32Value();
      Register out = locations->Out().AsRegister<Register>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_1) + data_offset;
        __ LoadFromOffset(kLoadUnsignedByte, out, obj, offset);
      } else {
        __ Addu(TMP, obj, index.AsRegister<Register>());
        __ LoadFromOffset(kLoadUnsignedByte, out, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimByte: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(int8_t)).Uint32Value();
      Register out = locations->Out().AsRegister<Register>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_1) + data_offset;
        __ LoadFromOffset(kLoadSignedByte, out, obj, offset);
      } else {
        __ Addu(TMP, obj, index.AsRegister<Register>());
        __ LoadFromOffset(kLoadSignedByte, out, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimShort: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(int16_t)).Uint32Value();
      Register out = locations->Out().AsRegister<Register>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_2) + data_offset;
        __ LoadFromOffset(kLoadSignedHalfword, out, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_2);
        __ Addu(TMP, obj, TMP);
        __ LoadFromOffset(kLoadSignedHalfword, out, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimChar: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(uint16_t)).Uint32Value();
      Register out = locations->Out().AsRegister<Register>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_2) + data_offset;
        __ LoadFromOffset(kLoadUnsignedHalfword, out, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_2);
        __ Addu(TMP, obj, TMP);
        __ LoadFromOffset(kLoadUnsignedHalfword, out, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimInt:
    case Primitive::kPrimNot: {
      DCHECK_EQ(sizeof(mirror::HeapReference<mirror::Object>), sizeof(int32_t));
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(int32_t)).Uint32Value();
      Register out = locations->Out().AsRegister<Register>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_4) + data_offset;
        __ LoadFromOffset(kLoadWord, out, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_4);
        __ Addu(TMP, obj, TMP);
        __ LoadFromOffset(kLoadWord, out, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimLong: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(int64_t)).Uint32Value();
      Register out = locations->Out().AsRegisterPairLow<Register>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_8) + data_offset;
        __ LoadFromOffset(kLoadDoubleword, out, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_8);
        __ Addu(TMP, obj, TMP);
        __ LoadFromOffset(kLoadDoubleword, out, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimFloat: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(float)).Uint32Value();
      FRegister out = locations->Out().AsFpuRegister<FRegister>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_4) + data_offset;
        __ LoadSFromOffset(out, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_4);
        __ Addu(TMP, obj, TMP);
        __ LoadSFromOffset(out, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimDouble: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(double)).Uint32Value();
      FRegister out = locations->Out().AsFpuRegister<FRegister>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_8) + data_offset;
        __ LoadDFromOffset(out, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_8);
        __ Addu(TMP, obj, TMP);
        __ LoadDFromOffset(out, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimVoid:
      LOG(FATAL) << "Unreachable type " << instruction->GetType();
      UNREACHABLE();
  }
  codegen_->MaybeRecordImplicitNullCheck(instruction);
}

void LocationsBuilderMIPS::VisitArrayLength(HArrayLength* instruction) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
}

void InstructionCodeGeneratorMIPS::VisitArrayLength(HArrayLength* instruction) {
  LocationSummary* locations = instruction->GetLocations();
  uint32_t offset = mirror::Array::LengthOffset().Uint32Value();
  Register obj = locations->InAt(0).AsRegister<Register>();
  Register out = locations->Out().AsRegister<Register>();
  __ LoadFromOffset(kLoadWord, out, obj, offset);
  codegen_->MaybeRecordImplicitNullCheck(instruction);
}

void LocationsBuilderMIPS::VisitArraySet(HArraySet* instruction) {
  Primitive::Type value_type = instruction->GetComponentType();
  bool is_object = value_type == Primitive::kPrimNot;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(
      instruction,
      is_object ? LocationSummary::kCall : LocationSummary::kNoCall);
  if (is_object) {
    InvokeRuntimeCallingConvention calling_convention;
    locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
    locations->SetInAt(1, Location::RegisterLocation(calling_convention.GetRegisterAt(1)));
    locations->SetInAt(2, Location::RegisterLocation(calling_convention.GetRegisterAt(2)));
  } else {
    locations->SetInAt(0, Location::RequiresRegister());
    locations->SetInAt(1, Location::RegisterOrConstant(instruction->InputAt(1)));
    if (Primitive::IsFloatingPointType(instruction->InputAt(2)->GetType())) {
      locations->SetInAt(2, Location::RequiresFpuRegister());
    } else {
      locations->SetInAt(2, Location::RequiresRegister());
    }
  }
}

void InstructionCodeGeneratorMIPS::VisitArraySet(HArraySet* instruction) {
  LocationSummary* locations = instruction->GetLocations();
  Register obj = locations->InAt(0).AsRegister<Register>();
  Location index = locations->InAt(1);
  Primitive::Type value_type = instruction->GetComponentType();
  bool needs_runtime_call = locations->WillCall();
  bool needs_write_barrier =
      CodeGenerator::StoreNeedsWriteBarrier(value_type, instruction->GetValue());

  switch (value_type) {
    case Primitive::kPrimBoolean:
    case Primitive::kPrimByte: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(uint8_t)).Uint32Value();
      Register value = locations->InAt(2).AsRegister<Register>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_1) + data_offset;
        __ StoreToOffset(kStoreByte, value, obj, offset);
      } else {
        __ Addu(TMP, obj, index.AsRegister<Register>());
        __ StoreToOffset(kStoreByte, value, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimShort:
    case Primitive::kPrimChar: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(uint16_t)).Uint32Value();
      Register value = locations->InAt(2).AsRegister<Register>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_2) + data_offset;
        __ StoreToOffset(kStoreHalfword, value, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_2);
        __ Addu(TMP, obj, TMP);
        __ StoreToOffset(kStoreHalfword, value, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimInt:
    case Primitive::kPrimNot: {
      if (!needs_runtime_call) {
        uint32_t data_offset = mirror::Array::DataOffset(sizeof(int32_t)).Uint32Value();
        Register value = locations->InAt(2).AsRegister<Register>();
        if (index.IsConstant()) {
          size_t offset =
              (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_4) + data_offset;
          __ StoreToOffset(kStoreWord, value, obj, offset);
        } else {
          DCHECK(index.IsRegister()) << index;
          __ Sll(TMP, index.AsRegister<Register>(), TIMES_4);
          __ Addu(TMP, obj, TMP);
          __ StoreToOffset(kStoreWord, value, TMP, data_offset);
        }
        codegen_->MaybeRecordImplicitNullCheck(instruction);
        if (needs_write_barrier) {
          DCHECK_EQ(value_type, Primitive::kPrimNot);
          codegen_->MarkGCCard(obj, value);
        }
      } else {
        DCHECK_EQ(value_type, Primitive::kPrimNot);
        codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pAputObject),
                                instruction,
                                instruction->GetDexPc(),
                                nullptr,
                                IsDirectEntrypoint(kQuickAputObject));
        CheckEntrypointTypes<kQuickAputObject, void, mirror::Array*, int32_t, mirror::Object*>();
      }
      break;
    }

    case Primitive::kPrimLong: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(int64_t)).Uint32Value();
      Register value = locations->InAt(2).AsRegisterPairLow<Register>();
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_8) + data_offset;
        __ StoreToOffset(kStoreDoubleword, value, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_8);
        __ Addu(TMP, obj, TMP);
        __ StoreToOffset(kStoreDoubleword, value, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimFloat: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(float)).Uint32Value();
      FRegister value = locations->InAt(2).AsFpuRegister<FRegister>();
      DCHECK(locations->InAt(2).IsFpuRegister());
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_4) + data_offset;
        __ StoreSToOffset(value, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_4);
        __ Addu(TMP, obj, TMP);
        __ StoreSToOffset(value, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimDouble: {
      uint32_t data_offset = mirror::Array::DataOffset(sizeof(double)).Uint32Value();
      FRegister value = locations->InAt(2).AsFpuRegister<FRegister>();
      DCHECK(locations->InAt(2).IsFpuRegister());
      if (index.IsConstant()) {
        size_t offset =
            (index.GetConstant()->AsIntConstant()->GetValue() << TIMES_8) + data_offset;
        __ StoreDToOffset(value, obj, offset);
      } else {
        __ Sll(TMP, index.AsRegister<Register>(), TIMES_8);
        __ Addu(TMP, obj, TMP);
        __ StoreDToOffset(value, TMP, data_offset);
      }
      break;
    }

    case Primitive::kPrimVoid:
      LOG(FATAL) << "Unreachable type " << instruction->GetType();
      UNREACHABLE();
  }

  // Ints and objects are handled in the switch.
  if (value_type != Primitive::kPrimInt && value_type != Primitive::kPrimNot) {
    codegen_->MaybeRecordImplicitNullCheck(instruction);
  }
}

void LocationsBuilderMIPS::VisitBoundsCheck(HBoundsCheck* instruction) {
  LocationSummary::CallKind call_kind = instruction->CanThrowIntoCatchBlock()
      ? LocationSummary::kCallOnSlowPath
      : LocationSummary::kNoCall;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction, call_kind);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetInAt(1, Location::RequiresRegister());
  if (instruction->HasUses()) {
    locations->SetOut(Location::SameAsFirstInput());
  }
}

void InstructionCodeGeneratorMIPS::VisitBoundsCheck(HBoundsCheck* instruction) {
  LocationSummary* locations = instruction->GetLocations();
  BoundsCheckSlowPathMIPS* slow_path =
      new (GetGraph()->GetArena()) BoundsCheckSlowPathMIPS(instruction);
  codegen_->AddSlowPath(slow_path);

  Register index = locations->InAt(0).AsRegister<Register>();
  Register length = locations->InAt(1).AsRegister<Register>();

  // length is limited by the maximum positive signed 32-bit integer.
  // Unsigned comparison of length and index checks for index < 0
  // and for length <= index simultaneously.
  __ Bgeu(index, length, slow_path->GetEntryLabel());
}

void LocationsBuilderMIPS::VisitCheckCast(HCheckCast* instruction) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(
      instruction,
      LocationSummary::kCallOnSlowPath);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetInAt(1, Location::RequiresRegister());
  // Note that TypeCheckSlowPathMIPS uses this register too.
  locations->AddTemp(Location::RequiresRegister());
}

void InstructionCodeGeneratorMIPS::VisitCheckCast(HCheckCast* instruction) {
  LocationSummary* locations = instruction->GetLocations();
  Register obj = locations->InAt(0).AsRegister<Register>();
  Register cls = locations->InAt(1).AsRegister<Register>();
  Register obj_cls = locations->GetTemp(0).AsRegister<Register>();

  SlowPathCodeMIPS* slow_path = new (GetGraph()->GetArena()) TypeCheckSlowPathMIPS(instruction);
  codegen_->AddSlowPath(slow_path);

  // TODO: avoid this check if we know obj is not null.
  __ Beqz(obj, slow_path->GetExitLabel());
  // Compare the class of `obj` with `cls`.
  __ LoadFromOffset(kLoadWord, obj_cls, obj, mirror::Object::ClassOffset().Int32Value());
  __ Bne(obj_cls, cls, slow_path->GetEntryLabel());
  __ Bind(slow_path->GetExitLabel());
}

void LocationsBuilderMIPS::VisitClinitCheck(HClinitCheck* check) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(check, LocationSummary::kCallOnSlowPath);
  locations->SetInAt(0, Location::RequiresRegister());
  if (check->HasUses()) {
    locations->SetOut(Location::SameAsFirstInput());
  }
}

void InstructionCodeGeneratorMIPS::VisitClinitCheck(HClinitCheck* check) {
  // We assume the class is not null.
  SlowPathCodeMIPS* slow_path = new (GetGraph()->GetArena()) LoadClassSlowPathMIPS(
      check->GetLoadClass(),
      check,
      check->GetDexPc(),
      true);
  codegen_->AddSlowPath(slow_path);
  GenerateClassInitializationCheck(slow_path,
                                   check->GetLocations()->InAt(0).AsRegister<Register>());
}

void LocationsBuilderMIPS::VisitCompare(HCompare* compare) {
  Primitive::Type in_type = compare->InputAt(0)->GetType();

  LocationSummary::CallKind call_kind = Primitive::IsFloatingPointType(in_type)
      ? LocationSummary::kCall
      : LocationSummary::kNoCall;

  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(compare, call_kind);

  switch (in_type) {
    case Primitive::kPrimLong:
      locations->SetInAt(0, Location::RequiresRegister());
      locations->SetInAt(1, Location::RequiresRegister());
      // Output overlaps because it is written before doing the low comparison.
      locations->SetOut(Location::RequiresRegister(), Location::kOutputOverlap);
      break;

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble: {
      InvokeRuntimeCallingConvention calling_convention;
      locations->SetInAt(0, Location::FpuRegisterLocation(calling_convention.GetFpuRegisterAt(0)));
      locations->SetInAt(1, Location::FpuRegisterLocation(calling_convention.GetFpuRegisterAt(1)));
      locations->SetOut(calling_convention.GetReturnLocation(Primitive::kPrimInt));
      break;
    }

    default:
      LOG(FATAL) << "Unexpected type for compare operation " << in_type;
  }
}

void InstructionCodeGeneratorMIPS::VisitCompare(HCompare* instruction) {
  LocationSummary* locations = instruction->GetLocations();
  Primitive::Type in_type = instruction->InputAt(0)->GetType();

  //  0 if: left == right
  //  1 if: left  > right
  // -1 if: left  < right
  switch (in_type) {
    case Primitive::kPrimLong: {
      MipsLabel done;
      Register res = locations->Out().AsRegister<Register>();
      Register lhs_high = locations->InAt(0).AsRegisterPairHigh<Register>();
      Register lhs_low  = locations->InAt(0).AsRegisterPairLow<Register>();
      Register rhs_high = locations->InAt(1).AsRegisterPairHigh<Register>();
      Register rhs_low  = locations->InAt(1).AsRegisterPairLow<Register>();
      // TODO: more efficient (direct) comparison with a constant.
      __ Slt(TMP, lhs_high, rhs_high);
      __ Slt(AT, rhs_high, lhs_high);  // Inverted: is actually gt.
      __ Subu(res, AT, TMP);           // Result -1:1:0 for [ <, >, == ].
      __ Bnez(res, &done);             // If we compared ==, check if lower bits are also equal.
      __ Sltu(TMP, lhs_low, rhs_low);
      __ Sltu(AT, rhs_low, lhs_low);   // Inverted: is actually gt.
      __ Subu(res, AT, TMP);           // Result -1:1:0 for [ <, >, == ].
      __ Bind(&done);
      break;
    }

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble: {
      int32_t entry_point_offset;
      bool direct;
      if (in_type == Primitive::kPrimFloat) {
        if (instruction->IsGtBias()) {
          entry_point_offset = QUICK_ENTRY_POINT(pCmpgFloat);
          direct = IsDirectEntrypoint(kQuickCmpgFloat);
        } else {
          entry_point_offset = QUICK_ENTRY_POINT(pCmplFloat);
          direct = IsDirectEntrypoint(kQuickCmplFloat);
        }
      } else {
        if (instruction->IsGtBias()) {
          entry_point_offset = QUICK_ENTRY_POINT(pCmpgDouble);
          direct = IsDirectEntrypoint(kQuickCmpgDouble);
        } else {
          entry_point_offset = QUICK_ENTRY_POINT(pCmplDouble);
          direct = IsDirectEntrypoint(kQuickCmplDouble);
        }
      }
      codegen_->InvokeRuntime(entry_point_offset,
                              instruction,
                              instruction->GetDexPc(),
                              nullptr,
                              direct);
      if (in_type == Primitive::kPrimFloat) {
        if (instruction->IsGtBias()) {
          CheckEntrypointTypes<kQuickCmpgFloat, int32_t, float, float>();
        } else {
          CheckEntrypointTypes<kQuickCmplFloat, int32_t, float, float>();
        }
      } else {
        if (instruction->IsGtBias()) {
          CheckEntrypointTypes<kQuickCmpgDouble, int32_t, double, double>();
        } else {
          CheckEntrypointTypes<kQuickCmplDouble, int32_t, double, double>();
        }
      }
      break;
    }

    default:
      LOG(FATAL) << "Unimplemented compare type " << in_type;
  }
}

void LocationsBuilderMIPS::VisitCondition(HCondition* instruction) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetInAt(1, Location::RegisterOrConstant(instruction->InputAt(1)));
  if (instruction->NeedsMaterialization()) {
    locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
  }
}

void InstructionCodeGeneratorMIPS::VisitCondition(HCondition* instruction) {
  if (!instruction->NeedsMaterialization()) {
    return;
  }
  // TODO: generalize to long
  DCHECK_NE(instruction->InputAt(0)->GetType(), Primitive::kPrimLong);

  LocationSummary* locations = instruction->GetLocations();
  Register dst = locations->Out().AsRegister<Register>();

  Register lhs = locations->InAt(0).AsRegister<Register>();
  Location rhs_location = locations->InAt(1);

  Register rhs_reg = ZERO;
  int64_t rhs_imm = 0;
  bool use_imm = rhs_location.IsConstant();
  if (use_imm) {
    rhs_imm = CodeGenerator::GetInt32ValueOf(rhs_location.GetConstant());
  } else {
    rhs_reg = rhs_location.AsRegister<Register>();
  }

  IfCondition if_cond = instruction->GetCondition();

  switch (if_cond) {
    case kCondEQ:
    case kCondNE:
      if (use_imm && IsUint<16>(rhs_imm)) {
        __ Xori(dst, lhs, rhs_imm);
      } else {
        if (use_imm) {
          rhs_reg = TMP;
          __ LoadConst32(rhs_reg, rhs_imm);
        }
        __ Xor(dst, lhs, rhs_reg);
      }
      if (if_cond == kCondEQ) {
        __ Sltiu(dst, dst, 1);
      } else {
        __ Sltu(dst, ZERO, dst);
      }
      break;

    case kCondLT:
    case kCondGE:
      if (use_imm && IsInt<16>(rhs_imm)) {
        __ Slti(dst, lhs, rhs_imm);
      } else {
        if (use_imm) {
          rhs_reg = TMP;
          __ LoadConst32(rhs_reg, rhs_imm);
        }
        __ Slt(dst, lhs, rhs_reg);
      }
      if (if_cond == kCondGE) {
        // Simulate lhs >= rhs via !(lhs < rhs) since there's
        // only the slt instruction but no sge.
        __ Xori(dst, dst, 1);
      }
      break;

    case kCondLE:
    case kCondGT:
      if (use_imm && IsInt<16>(rhs_imm + 1)) {
        // Simulate lhs <= rhs via lhs < rhs + 1.
        __ Slti(dst, lhs, rhs_imm + 1);
        if (if_cond == kCondGT) {
          // Simulate lhs > rhs via !(lhs <= rhs) since there's
          // only the slti instruction but no sgti.
          __ Xori(dst, dst, 1);
        }
      } else {
        if (use_imm) {
          rhs_reg = TMP;
          __ LoadConst32(rhs_reg, rhs_imm);
        }
        __ Slt(dst, rhs_reg, lhs);
        if (if_cond == kCondLE) {
          // Simulate lhs <= rhs via !(rhs < lhs) since there's
          // only the slt instruction but no sle.
          __ Xori(dst, dst, 1);
        }
      }
      break;

    case kCondB:
    case kCondAE:
      // Use sltiu instruction if rhs_imm is in range [0, 32767] or in
      // [max_unsigned - 32767 = 0xffff8000, max_unsigned = 0xffffffff].
      if (use_imm &&
          (IsUint<15>(rhs_imm) ||
              IsUint<15>(rhs_imm - (MaxInt<uint64_t>(32) - MaxInt<uint64_t>(15))))) {
        if (IsUint<15>(rhs_imm)) {
          __ Sltiu(dst, lhs, rhs_imm);
        } else {
          // 16-bit value (in range [0x8000, 0xffff]) passed to sltiu is sign-extended
          // and then used as unsigned integer (range [0xffff8000, 0xffffffff]).
          __ Sltiu(dst, lhs, rhs_imm - (MaxInt<uint64_t>(32) - MaxInt<uint64_t>(16)));
        }
      } else {
        if (use_imm) {
          rhs_reg = TMP;
          __ LoadConst32(rhs_reg, rhs_imm);
        }
        __ Sltu(dst, lhs, rhs_reg);
      }
      if (if_cond == kCondAE) {
        // Simulate lhs >= rhs via !(lhs < rhs) since there's
        // only the sltu instruction but no sgeu.
        __ Xori(dst, dst, 1);
      }
      break;

    case kCondBE:
    case kCondA:
      // Use sltiu instruction if rhs_imm is in range [0, 32766] or in
      // [max_unsigned - 32767 - 1 = 0xffff7fff, max_unsigned - 1 = 0xfffffffe].
      // lhs <= rhs is simulated via lhs < rhs + 1.
      if (use_imm && (rhs_imm != -1) &&
          (IsUint<15>(rhs_imm + 1) ||
              IsUint<15>(rhs_imm + 1 - (MaxInt<uint64_t>(32) - MaxInt<uint64_t>(15))))) {
        if (IsUint<15>(rhs_imm + 1)) {
          // Simulate lhs <= rhs via lhs < rhs + 1.
          __ Sltiu(dst, lhs, rhs_imm + 1);
        } else {
          // 16-bit value (in range [0x8000, 0xffff]) passed to sltiu is sign-extended
          // and then used as unsigned integer (range [0xffff8000, 0xffffffff] where rhs_imm
          // is in range [0xffff7fff, 0xfffffffe] since lhs <= rhs is simulated via lhs < rhs + 1).
          __ Sltiu(dst, lhs, rhs_imm + 1 - (MaxInt<uint64_t>(32) - MaxInt<uint64_t>(16)));
        }
        if (if_cond == kCondA) {
          // Simulate lhs > rhs via !(lhs <= rhs) since there's
          // only the sltiu instruction but no sgtiu.
          __ Xori(dst, dst, 1);
        }
      } else {
        if (use_imm) {
          rhs_reg = TMP;
          __ LoadConst32(rhs_reg, rhs_imm);
        }
        __ Sltu(dst, rhs_reg, lhs);
        if (if_cond == kCondBE) {
          // Simulate lhs <= rhs via !(rhs < lhs) since there's
          // only the sltu instruction but no sleu.
          __ Xori(dst, dst, 1);
        }
      }
      break;
  }
}

void LocationsBuilderMIPS::VisitDiv(HDiv* div) {
  Primitive::Type type = div->GetResultType();
  LocationSummary::CallKind call_kind = (type == Primitive::kPrimLong)
      ? LocationSummary::kCall
      : LocationSummary::kNoCall;

  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(div, call_kind);

  switch (type) {
    case Primitive::kPrimInt:
      locations->SetInAt(0, Location::RequiresRegister());
      locations->SetInAt(1, Location::RequiresRegister());
      locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
      break;

    case Primitive::kPrimLong: {
      InvokeRuntimeCallingConvention calling_convention;
      locations->SetInAt(0, Location::RegisterPairLocation(
          calling_convention.GetRegisterAt(0), calling_convention.GetRegisterAt(1)));
      locations->SetInAt(1, Location::RegisterPairLocation(
          calling_convention.GetRegisterAt(2), calling_convention.GetRegisterAt(3)));
      locations->SetOut(calling_convention.GetReturnLocation(type));
      break;
    }

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble:
      locations->SetInAt(0, Location::RequiresFpuRegister());
      locations->SetInAt(1, Location::RequiresFpuRegister());
      locations->SetOut(Location::RequiresFpuRegister(), Location::kNoOutputOverlap);
      break;

    default:
      LOG(FATAL) << "Unexpected div type " << type;
  }
}

void InstructionCodeGeneratorMIPS::VisitDiv(HDiv* instruction) {
  Primitive::Type type = instruction->GetType();
  LocationSummary* locations = instruction->GetLocations();
  bool isR6 = codegen_->GetInstructionSetFeatures().IsR6();

  switch (type) {
    case Primitive::kPrimInt: {
      Register dst = locations->Out().AsRegister<Register>();
      Register lhs = locations->InAt(0).AsRegister<Register>();
      Register rhs = locations->InAt(1).AsRegister<Register>();
      if (isR6) {
        __ DivR6(dst, lhs, rhs);
      } else {
        __ DivR2(dst, lhs, rhs);
      }
      break;
    }
    case Primitive::kPrimLong: {
      codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pLdiv),
                              instruction,
                              instruction->GetDexPc(),
                              nullptr,
                              IsDirectEntrypoint(kQuickLdiv));
      CheckEntrypointTypes<kQuickLdiv, int64_t, int64_t, int64_t>();
      break;
    }
    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble: {
      FRegister dst = locations->Out().AsFpuRegister<FRegister>();
      FRegister lhs = locations->InAt(0).AsFpuRegister<FRegister>();
      FRegister rhs = locations->InAt(1).AsFpuRegister<FRegister>();
      if (type == Primitive::kPrimFloat) {
        __ DivS(dst, lhs, rhs);
      } else {
        __ DivD(dst, lhs, rhs);
      }
      break;
    }
    default:
      LOG(FATAL) << "Unexpected div type " << type;
  }
}

void LocationsBuilderMIPS::VisitDivZeroCheck(HDivZeroCheck* instruction) {
  LocationSummary::CallKind call_kind = instruction->CanThrowIntoCatchBlock()
      ? LocationSummary::kCallOnSlowPath
      : LocationSummary::kNoCall;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction, call_kind);
  locations->SetInAt(0, Location::RegisterOrConstant(instruction->InputAt(0)));
  if (instruction->HasUses()) {
    locations->SetOut(Location::SameAsFirstInput());
  }
}

void InstructionCodeGeneratorMIPS::VisitDivZeroCheck(HDivZeroCheck* instruction) {
  SlowPathCodeMIPS* slow_path = new (GetGraph()->GetArena()) DivZeroCheckSlowPathMIPS(instruction);
  codegen_->AddSlowPath(slow_path);
  Location value = instruction->GetLocations()->InAt(0);
  Primitive::Type type = instruction->GetType();

  switch (type) {
    case Primitive::kPrimByte:
    case Primitive::kPrimChar:
    case Primitive::kPrimShort:
    case Primitive::kPrimInt: {
      if (value.IsConstant()) {
        if (value.GetConstant()->AsIntConstant()->GetValue() == 0) {
          __ B(slow_path->GetEntryLabel());
        } else {
          // A division by a non-null constant is valid. We don't need to perform
          // any check, so simply fall through.
        }
      } else {
        DCHECK(value.IsRegister()) << value;
        __ Beqz(value.AsRegister<Register>(), slow_path->GetEntryLabel());
      }
      break;
    }
    case Primitive::kPrimLong: {
      if (value.IsConstant()) {
        if (value.GetConstant()->AsLongConstant()->GetValue() == 0) {
          __ B(slow_path->GetEntryLabel());
        } else {
          // A division by a non-null constant is valid. We don't need to perform
          // any check, so simply fall through.
        }
      } else {
        DCHECK(value.IsRegisterPair()) << value;
        __ Or(TMP, value.AsRegisterPairHigh<Register>(), value.AsRegisterPairLow<Register>());
        __ Beqz(TMP, slow_path->GetEntryLabel());
      }
      break;
    }
    default:
      LOG(FATAL) << "Unexpected type " << type << " for DivZeroCheck.";
  }
}

void LocationsBuilderMIPS::VisitDoubleConstant(HDoubleConstant* constant) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(constant, LocationSummary::kNoCall);
  locations->SetOut(Location::ConstantLocation(constant));
}

void InstructionCodeGeneratorMIPS::VisitDoubleConstant(HDoubleConstant* cst ATTRIBUTE_UNUSED) {
  // Will be generated at use site.
}

void LocationsBuilderMIPS::VisitExit(HExit* exit) {
  exit->SetLocations(nullptr);
}

void InstructionCodeGeneratorMIPS::VisitExit(HExit* exit ATTRIBUTE_UNUSED) {
}

void LocationsBuilderMIPS::VisitFloatConstant(HFloatConstant* constant) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(constant, LocationSummary::kNoCall);
  locations->SetOut(Location::ConstantLocation(constant));
}

void InstructionCodeGeneratorMIPS::VisitFloatConstant(HFloatConstant* constant ATTRIBUTE_UNUSED) {
  // Will be generated at use site.
}

void LocationsBuilderMIPS::VisitGoto(HGoto* got) {
  got->SetLocations(nullptr);
}

void InstructionCodeGeneratorMIPS::HandleGoto(HInstruction* got, HBasicBlock* successor) {
  DCHECK(!successor->IsExitBlock());
  HBasicBlock* block = got->GetBlock();
  HInstruction* previous = got->GetPrevious();
  HLoopInformation* info = block->GetLoopInformation();

  if (info != nullptr && info->IsBackEdge(*block) && info->HasSuspendCheck()) {
    codegen_->ClearSpillSlotsFromLoopPhisInStackMap(info->GetSuspendCheck());
    GenerateSuspendCheck(info->GetSuspendCheck(), successor);
    return;
  }
  if (block->IsEntryBlock() && (previous != nullptr) && previous->IsSuspendCheck()) {
    GenerateSuspendCheck(previous->AsSuspendCheck(), nullptr);
  }
  if (!codegen_->GoesToNextBlock(block, successor)) {
    __ B(codegen_->GetLabelOf(successor));
  }
}

void InstructionCodeGeneratorMIPS::VisitGoto(HGoto* got) {
  HandleGoto(got, got->GetSuccessor());
}

void LocationsBuilderMIPS::VisitTryBoundary(HTryBoundary* try_boundary) {
  try_boundary->SetLocations(nullptr);
}

void InstructionCodeGeneratorMIPS::VisitTryBoundary(HTryBoundary* try_boundary) {
  HBasicBlock* successor = try_boundary->GetNormalFlowSuccessor();
  if (!successor->IsExitBlock()) {
    HandleGoto(try_boundary, successor);
  }
}

void InstructionCodeGeneratorMIPS::GenerateTestAndBranch(HInstruction* instruction,
                                                         MipsLabel* true_target,
                                                         MipsLabel* false_target,
                                                         MipsLabel* always_true_target) {
  HInstruction* cond = instruction->InputAt(0);
  HCondition* condition = cond->AsCondition();

  if (cond->IsIntConstant()) {
    int32_t cond_value = cond->AsIntConstant()->GetValue();
    if (cond_value == 1) {
      if (always_true_target != nullptr) {
        __ B(always_true_target);
      }
      return;
    } else {
      DCHECK_EQ(cond_value, 0);
    }
  } else if (!cond->IsCondition() || condition->NeedsMaterialization()) {
    // The condition instruction has been materialized, compare the output to 0.
    Location cond_val = instruction->GetLocations()->InAt(0);
    DCHECK(cond_val.IsRegister());
    __ Bnez(cond_val.AsRegister<Register>(), true_target);
  } else {
    // The condition instruction has not been materialized, use its inputs as
    // the comparison and its condition as the branch condition.
    Register lhs = condition->GetLocations()->InAt(0).AsRegister<Register>();
    Location rhs_location = condition->GetLocations()->InAt(1);
    Register rhs_reg = ZERO;
    int32_t rhs_imm = 0;
    bool use_imm = rhs_location.IsConstant();
    if (use_imm) {
      rhs_imm = CodeGenerator::GetInt32ValueOf(rhs_location.GetConstant());
    } else {
      rhs_reg = rhs_location.AsRegister<Register>();
    }

    IfCondition if_cond = condition->GetCondition();
    if (use_imm && rhs_imm == 0) {
      switch (if_cond) {
        case kCondEQ:
          __ Beqz(lhs, true_target);
          break;
        case kCondNE:
          __ Bnez(lhs, true_target);
          break;
        case kCondLT:
          __ Bltz(lhs, true_target);
          break;
        case kCondGE:
          __ Bgez(lhs, true_target);
          break;
        case kCondLE:
          __ Blez(lhs, true_target);
          break;
        case kCondGT:
          __ Bgtz(lhs, true_target);
          break;
        case kCondB:
          break;  // always false
        case kCondBE:
          __ Beqz(lhs, true_target);  // <= 0 if zero
          break;
        case kCondA:
          __ Bnez(lhs, true_target);  // > 0 if non-zero
          break;
        case kCondAE:
          __ B(true_target);  // always true
          break;
      }
    } else {
      if (use_imm) {
        // TODO: more efficient comparison with 16-bit constants without loading them into TMP.
        rhs_reg = TMP;
        __ LoadConst32(rhs_reg, rhs_imm);
      }
      switch (if_cond) {
        case kCondEQ:
          __ Beq(lhs, rhs_reg, true_target);
          break;
        case kCondNE:
          __ Bne(lhs, rhs_reg, true_target);
          break;
        case kCondLT:
          __ Blt(lhs, rhs_reg, true_target);
          break;
        case kCondGE:
          __ Bge(lhs, rhs_reg, true_target);
          break;
        case kCondLE:
          __ Bge(rhs_reg, lhs, true_target);
          break;
        case kCondGT:
          __ Blt(rhs_reg, lhs, true_target);
          break;
        case kCondB:
          __ Bltu(lhs, rhs_reg, true_target);
          break;
        case kCondAE:
          __ Bgeu(lhs, rhs_reg, true_target);
          break;
        case kCondBE:
          __ Bgeu(rhs_reg, lhs, true_target);
          break;
        case kCondA:
          __ Bltu(rhs_reg, lhs, true_target);
          break;
      }
    }
  }
  if (false_target != nullptr) {
    __ B(false_target);
  }
}

void LocationsBuilderMIPS::VisitIf(HIf* if_instr) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(if_instr);
  HInstruction* cond = if_instr->InputAt(0);
  if (!cond->IsCondition() || cond->AsCondition()->NeedsMaterialization()) {
    locations->SetInAt(0, Location::RequiresRegister());
  }
}

void InstructionCodeGeneratorMIPS::VisitIf(HIf* if_instr) {
  MipsLabel* true_target = codegen_->GetLabelOf(if_instr->IfTrueSuccessor());
  MipsLabel* false_target = codegen_->GetLabelOf(if_instr->IfFalseSuccessor());
  MipsLabel* always_true_target = true_target;
  if (codegen_->GoesToNextBlock(if_instr->GetBlock(),
                                if_instr->IfTrueSuccessor())) {
    always_true_target = nullptr;
  }
  if (codegen_->GoesToNextBlock(if_instr->GetBlock(),
                                if_instr->IfFalseSuccessor())) {
    false_target = nullptr;
  }
  GenerateTestAndBranch(if_instr, true_target, false_target, always_true_target);
}

void LocationsBuilderMIPS::VisitDeoptimize(HDeoptimize* deoptimize) {
  LocationSummary* locations = new (GetGraph()->GetArena())
      LocationSummary(deoptimize, LocationSummary::kCallOnSlowPath);
  HInstruction* cond = deoptimize->InputAt(0);
  if (!cond->IsCondition() || cond->AsCondition()->NeedsMaterialization()) {
    locations->SetInAt(0, Location::RequiresRegister());
  }
}

void InstructionCodeGeneratorMIPS::VisitDeoptimize(HDeoptimize* deoptimize) {
  SlowPathCodeMIPS* slow_path = new (GetGraph()->GetArena())
      DeoptimizationSlowPathMIPS(deoptimize);
  codegen_->AddSlowPath(slow_path);
  MipsLabel* slow_path_entry = slow_path->GetEntryLabel();
  GenerateTestAndBranch(deoptimize, slow_path_entry, nullptr, slow_path_entry);
}

void LocationsBuilderMIPS::HandleFieldGet(HInstruction* instruction, const FieldInfo& field_info) {
  Primitive::Type field_type = field_info.GetFieldType();
  bool is_wide = (field_type == Primitive::kPrimLong) || (field_type == Primitive::kPrimDouble);
  bool generate_volatile = field_info.IsVolatile() && is_wide;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(
      instruction, generate_volatile ? LocationSummary::kCall : LocationSummary::kNoCall);

  locations->SetInAt(0, Location::RequiresRegister());
  if (generate_volatile) {
    InvokeRuntimeCallingConvention calling_convention;
    // need A0 to hold base + offset
    locations->AddTemp(Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
    if (field_type == Primitive::kPrimLong) {
      locations->SetOut(calling_convention.GetReturnLocation(Primitive::kPrimLong));
    } else {
      locations->SetOut(Location::RequiresFpuRegister());
      // Need some temp core regs since FP results are returned in core registers
      Location reg = calling_convention.GetReturnLocation(Primitive::kPrimLong);
      locations->AddTemp(Location::RegisterLocation(reg.AsRegisterPairLow<Register>()));
      locations->AddTemp(Location::RegisterLocation(reg.AsRegisterPairHigh<Register>()));
    }
  } else {
    if (Primitive::IsFloatingPointType(instruction->GetType())) {
      locations->SetOut(Location::RequiresFpuRegister());
    } else {
      locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
    }
  }
}

void InstructionCodeGeneratorMIPS::HandleFieldGet(HInstruction* instruction,
                                                  const FieldInfo& field_info,
                                                  uint32_t dex_pc) {
  Primitive::Type type = field_info.GetFieldType();
  LocationSummary* locations = instruction->GetLocations();
  Register obj = locations->InAt(0).AsRegister<Register>();
  LoadOperandType load_type = kLoadUnsignedByte;
  bool is_volatile = field_info.IsVolatile();

  switch (type) {
    case Primitive::kPrimBoolean:
      load_type = kLoadUnsignedByte;
      break;
    case Primitive::kPrimByte:
      load_type = kLoadSignedByte;
      break;
    case Primitive::kPrimShort:
      load_type = kLoadSignedHalfword;
      break;
    case Primitive::kPrimChar:
      load_type = kLoadUnsignedHalfword;
      break;
    case Primitive::kPrimInt:
    case Primitive::kPrimFloat:
    case Primitive::kPrimNot:
      load_type = kLoadWord;
      break;
    case Primitive::kPrimLong:
    case Primitive::kPrimDouble:
      load_type = kLoadDoubleword;
      break;
    case Primitive::kPrimVoid:
      LOG(FATAL) << "Unreachable type " << type;
      UNREACHABLE();
  }

  if (is_volatile && load_type == kLoadDoubleword) {
    InvokeRuntimeCallingConvention calling_convention;
    __ Addiu32(locations->GetTemp(0).AsRegister<Register>(),
               obj, field_info.GetFieldOffset().Uint32Value());
    // Do implicit Null check
    __ Lw(ZERO, locations->GetTemp(0).AsRegister<Register>(), 0);
    codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
    codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pA64Load),
                            instruction,
                            dex_pc,
                            nullptr,
                            IsDirectEntrypoint(kQuickA64Load));
    CheckEntrypointTypes<kQuickA64Load, int64_t, volatile const int64_t*>();
    if (type == Primitive::kPrimDouble) {
      // Need to move to FP regs since FP results are returned in core registers.
      __ Mtc1(locations->GetTemp(1).AsRegister<Register>(),
              locations->Out().AsFpuRegister<FRegister>());
      __ Mthc1(locations->GetTemp(2).AsRegister<Register>(),
               locations->Out().AsFpuRegister<FRegister>());
    }
  } else {
    if (!Primitive::IsFloatingPointType(type)) {
      Register dst;
      if (type == Primitive::kPrimLong) {
        DCHECK(locations->Out().IsRegisterPair());
        dst = locations->Out().AsRegisterPairLow<Register>();
      } else {
        DCHECK(locations->Out().IsRegister());
        dst = locations->Out().AsRegister<Register>();
      }
      __ LoadFromOffset(load_type, dst, obj, field_info.GetFieldOffset().Uint32Value());
    } else {
      DCHECK(locations->Out().IsFpuRegister());
      FRegister dst = locations->Out().AsFpuRegister<FRegister>();
      if (type == Primitive::kPrimFloat) {
        __ LoadSFromOffset(dst, obj, field_info.GetFieldOffset().Uint32Value());
      } else {
        __ LoadDFromOffset(dst, obj, field_info.GetFieldOffset().Uint32Value());
      }
    }
    codegen_->MaybeRecordImplicitNullCheck(instruction);
  }

  if (is_volatile) {
    GenerateMemoryBarrier(MemBarrierKind::kLoadAny);
  }
}

void LocationsBuilderMIPS::HandleFieldSet(HInstruction* instruction, const FieldInfo& field_info) {
  Primitive::Type field_type = field_info.GetFieldType();
  bool is_wide = (field_type == Primitive::kPrimLong) || (field_type == Primitive::kPrimDouble);
  bool generate_volatile = field_info.IsVolatile() && is_wide;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(
      instruction, generate_volatile ? LocationSummary::kCall : LocationSummary::kNoCall);

  locations->SetInAt(0, Location::RequiresRegister());
  if (generate_volatile) {
    InvokeRuntimeCallingConvention calling_convention;
    // need A0 to hold base + offset
    locations->AddTemp(Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
    if (field_type == Primitive::kPrimLong) {
      locations->SetInAt(1, Location::RegisterPairLocation(
          calling_convention.GetRegisterAt(2), calling_convention.GetRegisterAt(3)));
    } else {
      locations->SetInAt(1, Location::RequiresFpuRegister());
      // Pass FP parameters in core registers.
      locations->AddTemp(Location::RegisterLocation(calling_convention.GetRegisterAt(2)));
      locations->AddTemp(Location::RegisterLocation(calling_convention.GetRegisterAt(3)));
    }
  } else {
    if (Primitive::IsFloatingPointType(field_type)) {
      locations->SetInAt(1, Location::RequiresFpuRegister());
    } else {
      locations->SetInAt(1, Location::RequiresRegister());
    }
  }
}

void InstructionCodeGeneratorMIPS::HandleFieldSet(HInstruction* instruction,
                                                  const FieldInfo& field_info,
                                                  uint32_t dex_pc) {
  Primitive::Type type = field_info.GetFieldType();
  LocationSummary* locations = instruction->GetLocations();
  Register obj = locations->InAt(0).AsRegister<Register>();
  StoreOperandType store_type = kStoreByte;
  bool is_volatile = field_info.IsVolatile();

  switch (type) {
    case Primitive::kPrimBoolean:
    case Primitive::kPrimByte:
      store_type = kStoreByte;
      break;
    case Primitive::kPrimShort:
    case Primitive::kPrimChar:
      store_type = kStoreHalfword;
      break;
    case Primitive::kPrimInt:
    case Primitive::kPrimFloat:
    case Primitive::kPrimNot:
      store_type = kStoreWord;
      break;
    case Primitive::kPrimLong:
    case Primitive::kPrimDouble:
      store_type = kStoreDoubleword;
      break;
    case Primitive::kPrimVoid:
      LOG(FATAL) << "Unreachable type " << type;
      UNREACHABLE();
  }

  if (is_volatile) {
    GenerateMemoryBarrier(MemBarrierKind::kAnyStore);
  }

  if (is_volatile && store_type == kStoreDoubleword) {
    InvokeRuntimeCallingConvention calling_convention;
    __ Addiu32(locations->GetTemp(0).AsRegister<Register>(),
               obj, field_info.GetFieldOffset().Uint32Value());
    // Do implicit Null check.
    __ Lw(ZERO, locations->GetTemp(0).AsRegister<Register>(), 0);
    codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
    if (type == Primitive::kPrimDouble) {
      // Pass FP parameters in core registers.
      __ Mfc1(locations->GetTemp(1).AsRegister<Register>(),
              locations->InAt(1).AsFpuRegister<FRegister>());
      __ Mfhc1(locations->GetTemp(2).AsRegister<Register>(),
               locations->InAt(1).AsFpuRegister<FRegister>());
    }
    codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pA64Store),
                            instruction,
                            dex_pc,
                            nullptr,
                            IsDirectEntrypoint(kQuickA64Store));
    CheckEntrypointTypes<kQuickA64Store, void, volatile int64_t *, int64_t>();
  } else {
    if (!Primitive::IsFloatingPointType(type)) {
      Register src;
      if (type == Primitive::kPrimLong) {
        DCHECK(locations->InAt(1).IsRegisterPair());
        src = locations->InAt(1).AsRegisterPairLow<Register>();
      } else {
        DCHECK(locations->InAt(1).IsRegister());
        src = locations->InAt(1).AsRegister<Register>();
      }
      __ StoreToOffset(store_type, src, obj, field_info.GetFieldOffset().Uint32Value());
    } else {
      DCHECK(locations->InAt(1).IsFpuRegister());
      FRegister src = locations->InAt(1).AsFpuRegister<FRegister>();
      if (type == Primitive::kPrimFloat) {
        __ StoreSToOffset(src, obj, field_info.GetFieldOffset().Uint32Value());
      } else {
        __ StoreDToOffset(src, obj, field_info.GetFieldOffset().Uint32Value());
      }
    }
    codegen_->MaybeRecordImplicitNullCheck(instruction);
  }

  // TODO: memory barriers?
  if (CodeGenerator::StoreNeedsWriteBarrier(type, instruction->InputAt(1))) {
    DCHECK(locations->InAt(1).IsRegister());
    Register src = locations->InAt(1).AsRegister<Register>();
    codegen_->MarkGCCard(obj, src);
  }

  if (is_volatile) {
    GenerateMemoryBarrier(MemBarrierKind::kAnyAny);
  }
}

void LocationsBuilderMIPS::VisitInstanceFieldGet(HInstanceFieldGet* instruction) {
  HandleFieldGet(instruction, instruction->GetFieldInfo());
}

void InstructionCodeGeneratorMIPS::VisitInstanceFieldGet(HInstanceFieldGet* instruction) {
  HandleFieldGet(instruction, instruction->GetFieldInfo(), instruction->GetDexPc());
}

void LocationsBuilderMIPS::VisitInstanceFieldSet(HInstanceFieldSet* instruction) {
  HandleFieldSet(instruction, instruction->GetFieldInfo());
}

void InstructionCodeGeneratorMIPS::VisitInstanceFieldSet(HInstanceFieldSet* instruction) {
  HandleFieldSet(instruction, instruction->GetFieldInfo(), instruction->GetDexPc());
}

void LocationsBuilderMIPS::VisitInstanceOf(HInstanceOf* instruction) {
  LocationSummary::CallKind call_kind =
      instruction->IsExactCheck() ? LocationSummary::kNoCall : LocationSummary::kCallOnSlowPath;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction, call_kind);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetInAt(1, Location::RequiresRegister());
  // The output does overlap inputs.
  // Note that TypeCheckSlowPathMIPS uses this register too.
  locations->SetOut(Location::RequiresRegister(), Location::kOutputOverlap);
}

void InstructionCodeGeneratorMIPS::VisitInstanceOf(HInstanceOf* instruction) {
  LocationSummary* locations = instruction->GetLocations();
  Register obj = locations->InAt(0).AsRegister<Register>();
  Register cls = locations->InAt(1).AsRegister<Register>();
  Register out = locations->Out().AsRegister<Register>();

  MipsLabel done;

  // Return 0 if `obj` is null.
  // TODO: Avoid this check if we know `obj` is not null.
  __ Move(out, ZERO);
  __ Beqz(obj, &done);

  // Compare the class of `obj` with `cls`.
  __ LoadFromOffset(kLoadWord, out, obj, mirror::Object::ClassOffset().Int32Value());
  if (instruction->IsExactCheck()) {
    // Classes must be equal for the instanceof to succeed.
    __ Xor(out, out, cls);
    __ Sltiu(out, out, 1);
  } else {
    // If the classes are not equal, we go into a slow path.
    DCHECK(locations->OnlyCallsOnSlowPath());
    SlowPathCodeMIPS* slow_path = new (GetGraph()->GetArena()) TypeCheckSlowPathMIPS(instruction);
    codegen_->AddSlowPath(slow_path);
    __ Bne(out, cls, slow_path->GetEntryLabel());
    __ LoadConst32(out, 1);
    __ Bind(slow_path->GetExitLabel());
  }

  __ Bind(&done);
}

void LocationsBuilderMIPS::VisitIntConstant(HIntConstant* constant) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(constant);
  locations->SetOut(Location::ConstantLocation(constant));
}

void InstructionCodeGeneratorMIPS::VisitIntConstant(HIntConstant* constant ATTRIBUTE_UNUSED) {
  // Will be generated at use site.
}

void LocationsBuilderMIPS::VisitNullConstant(HNullConstant* constant) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(constant);
  locations->SetOut(Location::ConstantLocation(constant));
}

void InstructionCodeGeneratorMIPS::VisitNullConstant(HNullConstant* constant ATTRIBUTE_UNUSED) {
  // Will be generated at use site.
}

void LocationsBuilderMIPS::HandleInvoke(HInvoke* invoke) {
  InvokeDexCallingConventionVisitorMIPS calling_convention_visitor;
  CodeGenerator::CreateCommonInvokeLocationSummary(invoke, &calling_convention_visitor);
}

void LocationsBuilderMIPS::VisitInvokeInterface(HInvokeInterface* invoke) {
  HandleInvoke(invoke);
  // The register T0 is required to be used for the hidden argument in
  // art_quick_imt_conflict_trampoline, so add the hidden argument.
  invoke->GetLocations()->AddTemp(Location::RegisterLocation(T0));
}

void InstructionCodeGeneratorMIPS::VisitInvokeInterface(HInvokeInterface* invoke) {
  // TODO: b/18116999, our IMTs can miss an IncompatibleClassChangeError.
  Register temp = invoke->GetLocations()->GetTemp(0).AsRegister<Register>();
  uint32_t method_offset = mirror::Class::EmbeddedImTableEntryOffset(
      invoke->GetImtIndex() % mirror::Class::kImtSize, kMipsPointerSize).Uint32Value();
  Location receiver = invoke->GetLocations()->InAt(0);
  uint32_t class_offset = mirror::Object::ClassOffset().Int32Value();
  Offset entry_point = ArtMethod::EntryPointFromQuickCompiledCodeOffset(kMipsWordSize);

  // Set the hidden argument.
  __ LoadConst32(invoke->GetLocations()->GetTemp(1).AsRegister<Register>(),
                 invoke->GetDexMethodIndex());

  // temp = object->GetClass();
  if (receiver.IsStackSlot()) {
    __ LoadFromOffset(kLoadWord, temp, SP, receiver.GetStackIndex());
    __ LoadFromOffset(kLoadWord, temp, temp, class_offset);
  } else {
    __ LoadFromOffset(kLoadWord, temp, receiver.AsRegister<Register>(), class_offset);
  }
  codegen_->MaybeRecordImplicitNullCheck(invoke);
  // temp = temp->GetImtEntryAt(method_offset);
  __ LoadFromOffset(kLoadWord, temp, temp, method_offset);
  // T9 = temp->GetEntryPoint();
  __ LoadFromOffset(kLoadWord, T9, temp, entry_point.Int32Value());
  // T9();
  __ Jalr(T9);
  __ Nop();
  DCHECK(!codegen_->IsLeafMethod());
  codegen_->RecordPcInfo(invoke, invoke->GetDexPc());
}

void LocationsBuilderMIPS::VisitInvokeVirtual(HInvokeVirtual* invoke) {
  // TODO: intrinsic function.
  HandleInvoke(invoke);
}

void LocationsBuilderMIPS::VisitInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke) {
  // When we do not run baseline, explicit clinit checks triggered by static
  // invokes must have been pruned by art::PrepareForRegisterAllocation.
  DCHECK(codegen_->IsBaseline() || !invoke->IsStaticWithExplicitClinitCheck());

  // TODO: intrinsic function.
  HandleInvoke(invoke);
}

static bool TryGenerateIntrinsicCode(HInvoke* invoke, CodeGeneratorMIPS* codegen ATTRIBUTE_UNUSED) {
  if (invoke->GetLocations()->Intrinsified()) {
    // TODO: intrinsic function.
    return true;
  }
  return false;
}

void CodeGeneratorMIPS::GenerateStaticOrDirectCall(HInvokeStaticOrDirect* invoke, Location temp) {
  // All registers are assumed to be correctly set up per the calling convention.

  Location callee_method = temp;  // For all kinds except kRecursive, callee will be in temp.
  switch (invoke->GetMethodLoadKind()) {
    case HInvokeStaticOrDirect::MethodLoadKind::kStringInit:
      // temp = thread->string_init_entrypoint
      __ LoadFromOffset(kLoadWord,
                        temp.AsRegister<Register>(),
                        TR,
                        invoke->GetStringInitOffset());
      break;
    case HInvokeStaticOrDirect::MethodLoadKind::kRecursive:
      callee_method = invoke->GetLocations()->InAt(invoke->GetCurrentMethodInputIndex());
      break;
    case HInvokeStaticOrDirect::MethodLoadKind::kDirectAddress:
      __ LoadConst32(temp.AsRegister<Register>(), invoke->GetMethodAddress());
      break;
    case HInvokeStaticOrDirect::MethodLoadKind::kDirectAddressWithFixup:
      // TODO: Implement this type. (Needs literal support.) At the moment, the
      // CompilerDriver will not direct the backend to use this type for MIPS.
      LOG(FATAL) << "Unsupported!";
      UNREACHABLE();
    case HInvokeStaticOrDirect::MethodLoadKind::kDexCachePcRelative:
      // TODO: Implement this type. For the moment, we fall back to kDexCacheViaMethod.
      FALLTHROUGH_INTENDED;
    case HInvokeStaticOrDirect::MethodLoadKind::kDexCacheViaMethod: {
      Location current_method = invoke->GetLocations()->InAt(invoke->GetCurrentMethodInputIndex());
      Register reg = temp.AsRegister<Register>();
      Register method_reg;
      if (current_method.IsRegister()) {
        method_reg = current_method.AsRegister<Register>();
      } else {
        // TODO: use the appropriate DCHECK() here if possible.
        // DCHECK(invoke->GetLocations()->Intrinsified());
        DCHECK(!current_method.IsValid());
        method_reg = reg;
        __ Lw(reg, SP, kCurrentMethodStackOffset);
      }

      // temp = temp->dex_cache_resolved_methods_;
      __ LoadFromOffset(kLoadWord,
                        reg,
                        method_reg,
                        ArtMethod::DexCacheResolvedMethodsOffset(kMipsPointerSize).Int32Value());
      // temp = temp[index_in_cache]
      uint32_t index_in_cache = invoke->GetTargetMethod().dex_method_index;
      __ LoadFromOffset(kLoadWord,
                        reg,
                        reg,
                        CodeGenerator::GetCachePointerOffset(index_in_cache));
      break;
    }
  }

  switch (invoke->GetCodePtrLocation()) {
    case HInvokeStaticOrDirect::CodePtrLocation::kCallSelf:
      __ Jalr(&frame_entry_label_, T9);
      break;
    case HInvokeStaticOrDirect::CodePtrLocation::kCallDirect:
      // LR = invoke->GetDirectCodePtr();
      __ LoadConst32(T9, invoke->GetDirectCodePtr());
      // LR()
      __ Jalr(T9);
      __ Nop();
      break;
    case HInvokeStaticOrDirect::CodePtrLocation::kCallPCRelative:
      // TODO: Implement kCallPCRelative. For the moment, we fall back to kMethodCode.
      FALLTHROUGH_INTENDED;
    case HInvokeStaticOrDirect::CodePtrLocation::kCallDirectWithFixup:
      // TODO: Implement kDirectCodeFixup. For the moment, we fall back to kMethodCode.
      FALLTHROUGH_INTENDED;
    case HInvokeStaticOrDirect::CodePtrLocation::kCallArtMethod:
      // T9 = callee_method->entry_point_from_quick_compiled_code_;
      __ LoadFromOffset(kLoadDoubleword,
                        T9,
                        callee_method.AsRegister<Register>(),
                        ArtMethod::EntryPointFromQuickCompiledCodeOffset(
                            kMipsWordSize).Int32Value());
      // T9()
      __ Jalr(T9);
      __ Nop();
      break;
  }
  DCHECK(!IsLeafMethod());
}

void InstructionCodeGeneratorMIPS::VisitInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke) {
  // When we do not run baseline, explicit clinit checks triggered by static
  // invokes must have been pruned by art::PrepareForRegisterAllocation.
  DCHECK(codegen_->IsBaseline() || !invoke->IsStaticWithExplicitClinitCheck());

  if (TryGenerateIntrinsicCode(invoke, codegen_)) {
    return;
  }

  LocationSummary* locations = invoke->GetLocations();
  codegen_->GenerateStaticOrDirectCall(invoke,
                                       locations->HasTemps()
                                           ? locations->GetTemp(0)
                                           : Location::NoLocation());
  codegen_->RecordPcInfo(invoke, invoke->GetDexPc());
}

void InstructionCodeGeneratorMIPS::VisitInvokeVirtual(HInvokeVirtual* invoke) {
  // TODO: Try to generate intrinsics code.
  LocationSummary* locations = invoke->GetLocations();
  Location receiver = locations->InAt(0);
  Register temp = invoke->GetLocations()->GetTemp(0).AsRegister<Register>();
  size_t method_offset = mirror::Class::EmbeddedVTableEntryOffset(
      invoke->GetVTableIndex(), kMipsPointerSize).SizeValue();
  uint32_t class_offset = mirror::Object::ClassOffset().Int32Value();
  Offset entry_point = ArtMethod::EntryPointFromQuickCompiledCodeOffset(kMipsWordSize);

  // temp = object->GetClass();
  if (receiver.IsStackSlot()) {
    __ LoadFromOffset(kLoadWord, temp, SP, receiver.GetStackIndex());
    __ LoadFromOffset(kLoadWord, temp, temp, class_offset);
  } else {
    DCHECK(receiver.IsRegister());
    __ LoadFromOffset(kLoadWord, temp, receiver.AsRegister<Register>(), class_offset);
  }
  codegen_->MaybeRecordImplicitNullCheck(invoke);
  // temp = temp->GetMethodAt(method_offset);
  __ LoadFromOffset(kLoadWord, temp, temp, method_offset);
  // T9 = temp->GetEntryPoint();
  __ LoadFromOffset(kLoadWord, T9, temp, entry_point.Int32Value());
  // T9();
  __ Jalr(T9);
  __ Nop();
  DCHECK(!codegen_->IsLeafMethod());
  codegen_->RecordPcInfo(invoke, invoke->GetDexPc());
}

void LocationsBuilderMIPS::VisitLoadClass(HLoadClass* cls) {
  LocationSummary::CallKind call_kind = cls->CanCallRuntime() ? LocationSummary::kCallOnSlowPath
                                                              : LocationSummary::kNoCall;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(cls, call_kind);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetOut(Location::RequiresRegister());
}

void InstructionCodeGeneratorMIPS::VisitLoadClass(HLoadClass* cls) {
  LocationSummary* locations = cls->GetLocations();
  Register out = locations->Out().AsRegister<Register>();
  Register current_method = locations->InAt(0).AsRegister<Register>();
  if (cls->IsReferrersClass()) {
    DCHECK(!cls->CanCallRuntime());
    DCHECK(!cls->MustGenerateClinitCheck());
    __ LoadFromOffset(kLoadWord, out, current_method,
                      ArtMethod::DeclaringClassOffset().Int32Value());
  } else {
    DCHECK(cls->CanCallRuntime());
    __ LoadFromOffset(kLoadWord, out, current_method,
                      ArtMethod::DexCacheResolvedTypesOffset(kMipsPointerSize).Int32Value());
    __ LoadFromOffset(kLoadWord, out, out, CodeGenerator::GetCacheOffset(cls->GetTypeIndex()));
    SlowPathCodeMIPS* slow_path = new (GetGraph()->GetArena()) LoadClassSlowPathMIPS(
        cls,
        cls,
        cls->GetDexPc(),
        cls->MustGenerateClinitCheck());
    codegen_->AddSlowPath(slow_path);
    __ Beqz(out, slow_path->GetEntryLabel());
    if (cls->MustGenerateClinitCheck()) {
      GenerateClassInitializationCheck(slow_path, out);
    } else {
      __ Bind(slow_path->GetExitLabel());
    }
  }
}

static int32_t GetExceptionTlsOffset() {
  return Thread::ExceptionOffset<kMipsWordSize>().Int32Value();
}

void LocationsBuilderMIPS::VisitLoadException(HLoadException* load) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(load, LocationSummary::kNoCall);
  locations->SetOut(Location::RequiresRegister());
}

void InstructionCodeGeneratorMIPS::VisitLoadException(HLoadException* load) {
  Register out = load->GetLocations()->Out().AsRegister<Register>();
  __ LoadFromOffset(kLoadWord, out, TR, GetExceptionTlsOffset());
}

void LocationsBuilderMIPS::VisitClearException(HClearException* clear) {
  new (GetGraph()->GetArena()) LocationSummary(clear, LocationSummary::kNoCall);
}

void InstructionCodeGeneratorMIPS::VisitClearException(HClearException* clear ATTRIBUTE_UNUSED) {
  __ StoreToOffset(kStoreWord, ZERO, TR, GetExceptionTlsOffset());
}

void LocationsBuilderMIPS::VisitLoadLocal(HLoadLocal* load) {
  load->SetLocations(nullptr);
}

void InstructionCodeGeneratorMIPS::VisitLoadLocal(HLoadLocal* load ATTRIBUTE_UNUSED) {
  // Nothing to do, this is driven by the code generator.
}

void LocationsBuilderMIPS::VisitLoadString(HLoadString* load) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(load, LocationSummary::kCallOnSlowPath);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetOut(Location::RequiresRegister());
}

void InstructionCodeGeneratorMIPS::VisitLoadString(HLoadString* load) {
  SlowPathCodeMIPS* slow_path = new (GetGraph()->GetArena()) LoadStringSlowPathMIPS(load);
  codegen_->AddSlowPath(slow_path);

  LocationSummary* locations = load->GetLocations();
  Register out = locations->Out().AsRegister<Register>();
  Register current_method = locations->InAt(0).AsRegister<Register>();
  __ LoadFromOffset(kLoadWord, out, current_method, ArtMethod::DeclaringClassOffset().Int32Value());
  __ LoadFromOffset(kLoadWord, out, out, mirror::Class::DexCacheStringsOffset().Int32Value());
  __ LoadFromOffset(kLoadWord, out, out, CodeGenerator::GetCacheOffset(load->GetStringIndex()));
  __ Beqz(out, slow_path->GetEntryLabel());
  __ Bind(slow_path->GetExitLabel());
}

void LocationsBuilderMIPS::VisitLocal(HLocal* local) {
  local->SetLocations(nullptr);
}

void InstructionCodeGeneratorMIPS::VisitLocal(HLocal* local) {
  DCHECK_EQ(local->GetBlock(), GetGraph()->GetEntryBlock());
}

void LocationsBuilderMIPS::VisitLongConstant(HLongConstant* constant) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(constant);
  locations->SetOut(Location::ConstantLocation(constant));
}

void InstructionCodeGeneratorMIPS::VisitLongConstant(HLongConstant* constant ATTRIBUTE_UNUSED) {
  // Will be generated at use site.
}

void LocationsBuilderMIPS::VisitMonitorOperation(HMonitorOperation* instruction) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kCall);
  InvokeRuntimeCallingConvention calling_convention;
  locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
}

void InstructionCodeGeneratorMIPS::VisitMonitorOperation(HMonitorOperation* instruction) {
  if (instruction->IsEnter()) {
    codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pLockObject),
                            instruction,
                            instruction->GetDexPc(),
                            nullptr,
                            IsDirectEntrypoint(kQuickLockObject));
    CheckEntrypointTypes<kQuickLockObject, void, mirror::Object*>();
  } else {
    codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pUnlockObject),
                            instruction,
                            instruction->GetDexPc(),
                            nullptr,
                            IsDirectEntrypoint(kQuickUnlockObject));
  }
  CheckEntrypointTypes<kQuickUnlockObject, void, mirror::Object*>();
}

void LocationsBuilderMIPS::VisitMul(HMul* mul) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(mul, LocationSummary::kNoCall);
  switch (mul->GetResultType()) {
    case Primitive::kPrimInt:
    case Primitive::kPrimLong:
      locations->SetInAt(0, Location::RequiresRegister());
      locations->SetInAt(1, Location::RequiresRegister());
      locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
      break;

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble:
      locations->SetInAt(0, Location::RequiresFpuRegister());
      locations->SetInAt(1, Location::RequiresFpuRegister());
      locations->SetOut(Location::RequiresFpuRegister(), Location::kNoOutputOverlap);
      break;

    default:
      LOG(FATAL) << "Unexpected mul type " << mul->GetResultType();
  }
}

void InstructionCodeGeneratorMIPS::VisitMul(HMul* instruction) {
  Primitive::Type type = instruction->GetType();
  LocationSummary* locations = instruction->GetLocations();
  bool isR6 = codegen_->GetInstructionSetFeatures().IsR6();

  switch (type) {
    case Primitive::kPrimInt: {
      Register dst = locations->Out().AsRegister<Register>();
      Register lhs = locations->InAt(0).AsRegister<Register>();
      Register rhs = locations->InAt(1).AsRegister<Register>();

      if (isR6) {
        __ MulR6(dst, lhs, rhs);
      } else {
        __ MulR2(dst, lhs, rhs);
      }
      break;
    }
    case Primitive::kPrimLong: {
      Register dst_high = locations->Out().AsRegisterPairHigh<Register>();
      Register dst_low = locations->Out().AsRegisterPairLow<Register>();
      Register lhs_high = locations->InAt(0).AsRegisterPairHigh<Register>();
      Register lhs_low = locations->InAt(0).AsRegisterPairLow<Register>();
      Register rhs_high = locations->InAt(1).AsRegisterPairHigh<Register>();
      Register rhs_low = locations->InAt(1).AsRegisterPairLow<Register>();

      // Extra checks to protect caused by the existance of A1_A2.
      // The algorithm is wrong if dst_high is either lhs_lo or rhs_lo:
      // (e.g. lhs=a0_a1, rhs=a2_a3 and dst=a1_a2).
      DCHECK_NE(dst_high, lhs_low);
      DCHECK_NE(dst_high, rhs_low);

      // A_B * C_D
      // dst_hi:  [ low(A*D) + low(B*C) + hi(B*D) ]
      // dst_lo:  [ low(B*D) ]
      // Note: R2 and R6 MUL produce the low 32 bit of the multiplication result.

      if (isR6) {
        __ MulR6(TMP, lhs_high, rhs_low);
        __ MulR6(dst_high, lhs_low, rhs_high);
        __ Addu(dst_high, dst_high, TMP);
        __ MuhuR6(TMP, lhs_low, rhs_low);
        __ Addu(dst_high, dst_high, TMP);
        __ MulR6(dst_low, lhs_low, rhs_low);
      } else {
        __ MulR2(TMP, lhs_high, rhs_low);
        __ MulR2(dst_high, lhs_low, rhs_high);
        __ Addu(dst_high, dst_high, TMP);
        __ MultuR2(lhs_low, rhs_low);
        __ Mfhi(TMP);
        __ Addu(dst_high, dst_high, TMP);
        __ Mflo(dst_low);
      }
      break;
    }
    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble: {
      FRegister dst = locations->Out().AsFpuRegister<FRegister>();
      FRegister lhs = locations->InAt(0).AsFpuRegister<FRegister>();
      FRegister rhs = locations->InAt(1).AsFpuRegister<FRegister>();
      if (type == Primitive::kPrimFloat) {
        __ MulS(dst, lhs, rhs);
      } else {
        __ MulD(dst, lhs, rhs);
      }
      break;
    }
    default:
      LOG(FATAL) << "Unexpected mul type " << type;
  }
}

void LocationsBuilderMIPS::VisitNeg(HNeg* neg) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(neg, LocationSummary::kNoCall);
  switch (neg->GetResultType()) {
    case Primitive::kPrimInt:
    case Primitive::kPrimLong:
      locations->SetInAt(0, Location::RequiresRegister());
      locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
      break;

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble:
      locations->SetInAt(0, Location::RequiresFpuRegister());
      locations->SetOut(Location::RequiresFpuRegister(), Location::kNoOutputOverlap);
      break;

    default:
      LOG(FATAL) << "Unexpected neg type " << neg->GetResultType();
  }
}

void InstructionCodeGeneratorMIPS::VisitNeg(HNeg* instruction) {
  Primitive::Type type = instruction->GetType();
  LocationSummary* locations = instruction->GetLocations();

  switch (type) {
    case Primitive::kPrimInt: {
      Register dst = locations->Out().AsRegister<Register>();
      Register src = locations->InAt(0).AsRegister<Register>();
      __ Subu(dst, ZERO, src);
      break;
    }
    case Primitive::kPrimLong: {
      Register dst_high = locations->Out().AsRegisterPairHigh<Register>();
      Register dst_low = locations->Out().AsRegisterPairLow<Register>();
      Register src_high = locations->InAt(0).AsRegisterPairHigh<Register>();
      Register src_low = locations->InAt(0).AsRegisterPairLow<Register>();
      __ Subu(dst_low, ZERO, src_low);
      __ Sltu(TMP, ZERO, dst_low);
      __ Subu(dst_high, ZERO, src_high);
      __ Subu(dst_high, dst_high, TMP);
      break;
    }
    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble: {
      FRegister dst = locations->Out().AsFpuRegister<FRegister>();
      FRegister src = locations->InAt(0).AsFpuRegister<FRegister>();
      if (type == Primitive::kPrimFloat) {
        __ NegS(dst, src);
      } else {
        __ NegD(dst, src);
      }
      break;
    }
    default:
      LOG(FATAL) << "Unexpected neg type " << type;
  }
}

void LocationsBuilderMIPS::VisitNewArray(HNewArray* instruction) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kCall);
  InvokeRuntimeCallingConvention calling_convention;
  locations->AddTemp(Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
  locations->AddTemp(Location::RegisterLocation(calling_convention.GetRegisterAt(2)));
  locations->SetOut(calling_convention.GetReturnLocation(Primitive::kPrimNot));
  locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(1)));
}

void InstructionCodeGeneratorMIPS::VisitNewArray(HNewArray* instruction) {
  InvokeRuntimeCallingConvention calling_convention;
  Register current_method_register = calling_convention.GetRegisterAt(2);
  __ Lw(current_method_register, SP, kCurrentMethodStackOffset);
  // Move an uint16_t value to a register.
  __ LoadConst32(calling_convention.GetRegisterAt(0), instruction->GetTypeIndex());
  codegen_->InvokeRuntime(
      GetThreadOffset<kMipsWordSize>(instruction->GetEntrypoint()).Int32Value(),
      instruction,
      instruction->GetDexPc(),
      nullptr,
      IsDirectEntrypoint(kQuickAllocArrayWithAccessCheck));
  CheckEntrypointTypes<kQuickAllocArrayWithAccessCheck,
                       void*, uint32_t, int32_t, ArtMethod*>();
}

void LocationsBuilderMIPS::VisitNewInstance(HNewInstance* instruction) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kCall);
  InvokeRuntimeCallingConvention calling_convention;
  locations->AddTemp(Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
  locations->AddTemp(Location::RegisterLocation(calling_convention.GetRegisterAt(1)));
  locations->SetOut(calling_convention.GetReturnLocation(Primitive::kPrimNot));
}

void InstructionCodeGeneratorMIPS::VisitNewInstance(HNewInstance* instruction) {
  InvokeRuntimeCallingConvention calling_convention;
  Register current_method_register = calling_convention.GetRegisterAt(1);
  __ Lw(current_method_register, SP, kCurrentMethodStackOffset);
  // Move an uint16_t value to a register.
  __ LoadConst32(calling_convention.GetRegisterAt(0), instruction->GetTypeIndex());
  codegen_->InvokeRuntime(
      GetThreadOffset<kMipsWordSize>(instruction->GetEntrypoint()).Int32Value(),
      instruction,
      instruction->GetDexPc(),
      nullptr,
      IsDirectEntrypoint(kQuickAllocObjectWithAccessCheck));
  CheckEntrypointTypes<kQuickAllocObjectWithAccessCheck, void*, uint32_t, ArtMethod*>();
}

void LocationsBuilderMIPS::VisitNot(HNot* instruction) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
}

void InstructionCodeGeneratorMIPS::VisitNot(HNot* instruction) {
  Primitive::Type type = instruction->GetType();
  LocationSummary* locations = instruction->GetLocations();

  switch (type) {
    case Primitive::kPrimInt: {
      Register dst = locations->Out().AsRegister<Register>();
      Register src = locations->InAt(0).AsRegister<Register>();
      __ Nor(dst, src, ZERO);
      break;
    }

    case Primitive::kPrimLong: {
      Register dst_high = locations->Out().AsRegisterPairHigh<Register>();
      Register dst_low = locations->Out().AsRegisterPairLow<Register>();
      Register src_high = locations->InAt(0).AsRegisterPairHigh<Register>();
      Register src_low = locations->InAt(0).AsRegisterPairLow<Register>();
      __ Nor(dst_high, src_high, ZERO);
      __ Nor(dst_low, src_low, ZERO);
      break;
    }

    default:
      LOG(FATAL) << "Unexpected type for not operation " << instruction->GetResultType();
  }
}

void LocationsBuilderMIPS::VisitBooleanNot(HBooleanNot* instruction) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction);
  locations->SetInAt(0, Location::RequiresRegister());
  locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
}

void InstructionCodeGeneratorMIPS::VisitBooleanNot(HBooleanNot* instruction) {
  LocationSummary* locations = instruction->GetLocations();
  __ Xori(locations->Out().AsRegister<Register>(),
          locations->InAt(0).AsRegister<Register>(),
          1);
}

void LocationsBuilderMIPS::VisitNullCheck(HNullCheck* instruction) {
  LocationSummary::CallKind call_kind = instruction->CanThrowIntoCatchBlock()
      ? LocationSummary::kCallOnSlowPath
      : LocationSummary::kNoCall;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction, call_kind);
  locations->SetInAt(0, Location::RequiresRegister());
  if (instruction->HasUses()) {
    locations->SetOut(Location::SameAsFirstInput());
  }
}

void InstructionCodeGeneratorMIPS::GenerateImplicitNullCheck(HNullCheck* instruction) {
  if (codegen_->CanMoveNullCheckToUser(instruction)) {
    return;
  }
  Location obj = instruction->GetLocations()->InAt(0);

  __ Lw(ZERO, obj.AsRegister<Register>(), 0);
  codegen_->RecordPcInfo(instruction, instruction->GetDexPc());
}

void InstructionCodeGeneratorMIPS::GenerateExplicitNullCheck(HNullCheck* instruction) {
  SlowPathCodeMIPS* slow_path = new (GetGraph()->GetArena()) NullCheckSlowPathMIPS(instruction);
  codegen_->AddSlowPath(slow_path);

  Location obj = instruction->GetLocations()->InAt(0);

  __ Beqz(obj.AsRegister<Register>(), slow_path->GetEntryLabel());
}

void InstructionCodeGeneratorMIPS::VisitNullCheck(HNullCheck* instruction) {
  if (codegen_->IsImplicitNullCheckAllowed(instruction)) {
    GenerateImplicitNullCheck(instruction);
  } else {
    GenerateExplicitNullCheck(instruction);
  }
}

void LocationsBuilderMIPS::VisitOr(HOr* instruction) {
  HandleBinaryOp(instruction);
}

void InstructionCodeGeneratorMIPS::VisitOr(HOr* instruction) {
  HandleBinaryOp(instruction);
}

void LocationsBuilderMIPS::VisitParallelMove(HParallelMove* instruction ATTRIBUTE_UNUSED) {
  LOG(FATAL) << "Unreachable";
}

void InstructionCodeGeneratorMIPS::VisitParallelMove(HParallelMove* instruction) {
  codegen_->GetMoveResolver()->EmitNativeCode(instruction);
}

void LocationsBuilderMIPS::VisitParameterValue(HParameterValue* instruction) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction);
  Location location = parameter_visitor_.GetNextLocation(instruction->GetType());
  if (location.IsStackSlot()) {
    location = Location::StackSlot(location.GetStackIndex() + codegen_->GetFrameSize());
  } else if (location.IsDoubleStackSlot()) {
    location = Location::DoubleStackSlot(location.GetStackIndex() + codegen_->GetFrameSize());
  }
  locations->SetOut(location);
}

void InstructionCodeGeneratorMIPS::VisitParameterValue(HParameterValue* instruction
                                                         ATTRIBUTE_UNUSED) {
  // Nothing to do, the parameter is already at its location.
}

void LocationsBuilderMIPS::VisitCurrentMethod(HCurrentMethod* instruction) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kNoCall);
  locations->SetOut(Location::RegisterLocation(kMethodRegisterArgument));
}

void InstructionCodeGeneratorMIPS::VisitCurrentMethod(HCurrentMethod* instruction
                                                        ATTRIBUTE_UNUSED) {
  // Nothing to do, the method is already at its location.
}

void LocationsBuilderMIPS::VisitPhi(HPhi* instruction) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction);
  for (size_t i = 0, e = instruction->InputCount(); i < e; ++i) {
    locations->SetInAt(i, Location::Any());
  }
  locations->SetOut(Location::Any());
}

void InstructionCodeGeneratorMIPS::VisitPhi(HPhi* instruction ATTRIBUTE_UNUSED) {
  LOG(FATAL) << "Unreachable";
}

void LocationsBuilderMIPS::VisitRem(HRem* rem) {
  Primitive::Type type = rem->GetResultType();
  LocationSummary::CallKind call_kind =
      (type == Primitive::kPrimInt) ? LocationSummary::kNoCall : LocationSummary::kCall;
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(rem, call_kind);

  switch (type) {
    case Primitive::kPrimInt:
      locations->SetInAt(0, Location::RequiresRegister());
      locations->SetInAt(1, Location::RequiresRegister());
      locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
      break;

    case Primitive::kPrimLong: {
      InvokeRuntimeCallingConvention calling_convention;
      locations->SetInAt(0, Location::RegisterPairLocation(
          calling_convention.GetRegisterAt(0), calling_convention.GetRegisterAt(1)));
      locations->SetInAt(1, Location::RegisterPairLocation(
          calling_convention.GetRegisterAt(2), calling_convention.GetRegisterAt(3)));
      locations->SetOut(calling_convention.GetReturnLocation(type));
      break;
    }

    case Primitive::kPrimFloat:
    case Primitive::kPrimDouble: {
      InvokeRuntimeCallingConvention calling_convention;
      locations->SetInAt(0, Location::FpuRegisterLocation(calling_convention.GetFpuRegisterAt(0)));
      locations->SetInAt(1, Location::FpuRegisterLocation(calling_convention.GetFpuRegisterAt(1)));
      locations->SetOut(calling_convention.GetReturnLocation(type));
      break;
    }

    default:
      LOG(FATAL) << "Unexpected rem type " << type;
  }
}

void InstructionCodeGeneratorMIPS::VisitRem(HRem* instruction) {
  Primitive::Type type = instruction->GetType();
  LocationSummary* locations = instruction->GetLocations();
  bool isR6 = codegen_->GetInstructionSetFeatures().IsR6();

  switch (type) {
    case Primitive::kPrimInt: {
      Register dst = locations->Out().AsRegister<Register>();
      Register lhs = locations->InAt(0).AsRegister<Register>();
      Register rhs = locations->InAt(1).AsRegister<Register>();
      if (isR6) {
        __ ModR6(dst, lhs, rhs);
      } else {
        __ ModR2(dst, lhs, rhs);
      }
      break;
    }
    case Primitive::kPrimLong: {
      codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pLmod),
                              instruction,
                              instruction->GetDexPc(),
                              nullptr,
                              IsDirectEntrypoint(kQuickLmod));
      CheckEntrypointTypes<kQuickLmod, int64_t, int64_t, int64_t>();
      break;
    }
    case Primitive::kPrimFloat: {
      codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pFmodf),
                              instruction, instruction->GetDexPc(),
                              nullptr,
                              IsDirectEntrypoint(kQuickFmodf));
      CheckEntrypointTypes<kQuickL2f, float, int64_t>();
      break;
    }
    case Primitive::kPrimDouble: {
      codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pFmod),
                              instruction, instruction->GetDexPc(),
                              nullptr,
                              IsDirectEntrypoint(kQuickFmod));
      CheckEntrypointTypes<kQuickL2d, double, int64_t>();
      break;
    }
    default:
      LOG(FATAL) << "Unexpected rem type " << type;
  }
}

void LocationsBuilderMIPS::VisitMemoryBarrier(HMemoryBarrier* memory_barrier) {
  memory_barrier->SetLocations(nullptr);
}

void InstructionCodeGeneratorMIPS::VisitMemoryBarrier(HMemoryBarrier* memory_barrier) {
  GenerateMemoryBarrier(memory_barrier->GetBarrierKind());
}

void LocationsBuilderMIPS::VisitReturn(HReturn* ret) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(ret);
  Primitive::Type return_type = ret->InputAt(0)->GetType();
  locations->SetInAt(0, MipsReturnLocation(return_type));
}

void InstructionCodeGeneratorMIPS::VisitReturn(HReturn* ret ATTRIBUTE_UNUSED) {
  codegen_->GenerateFrameExit();
}

void LocationsBuilderMIPS::VisitReturnVoid(HReturnVoid* ret) {
  ret->SetLocations(nullptr);
}

void InstructionCodeGeneratorMIPS::VisitReturnVoid(HReturnVoid* ret ATTRIBUTE_UNUSED) {
  codegen_->GenerateFrameExit();
}

void LocationsBuilderMIPS::VisitShl(HShl* shl) {
  HandleShift(shl);
}

void InstructionCodeGeneratorMIPS::VisitShl(HShl* shl) {
  HandleShift(shl);
}

void LocationsBuilderMIPS::VisitShr(HShr* shr) {
  HandleShift(shr);
}

void InstructionCodeGeneratorMIPS::VisitShr(HShr* shr) {
  HandleShift(shr);
}

void LocationsBuilderMIPS::VisitStoreLocal(HStoreLocal* store) {
  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(store);
  Primitive::Type field_type = store->InputAt(1)->GetType();
  switch (field_type) {
    case Primitive::kPrimNot:
    case Primitive::kPrimBoolean:
    case Primitive::kPrimByte:
    case Primitive::kPrimChar:
    case Primitive::kPrimShort:
    case Primitive::kPrimInt:
    case Primitive::kPrimFloat:
      locations->SetInAt(1, Location::StackSlot(codegen_->GetStackSlot(store->GetLocal())));
      break;

    case Primitive::kPrimLong:
    case Primitive::kPrimDouble:
      locations->SetInAt(1, Location::DoubleStackSlot(codegen_->GetStackSlot(store->GetLocal())));
      break;

    default:
      LOG(FATAL) << "Unimplemented local type " << field_type;
  }
}

void InstructionCodeGeneratorMIPS::VisitStoreLocal(HStoreLocal* store ATTRIBUTE_UNUSED) {
}

void LocationsBuilderMIPS::VisitSub(HSub* instruction) {
  HandleBinaryOp(instruction);
}

void InstructionCodeGeneratorMIPS::VisitSub(HSub* instruction) {
  HandleBinaryOp(instruction);
}

void LocationsBuilderMIPS::VisitStaticFieldGet(HStaticFieldGet* instruction) {
  HandleFieldGet(instruction, instruction->GetFieldInfo());
}

void InstructionCodeGeneratorMIPS::VisitStaticFieldGet(HStaticFieldGet* instruction) {
  HandleFieldGet(instruction, instruction->GetFieldInfo(), instruction->GetDexPc());
}

void LocationsBuilderMIPS::VisitStaticFieldSet(HStaticFieldSet* instruction) {
  HandleFieldSet(instruction, instruction->GetFieldInfo());
}

void InstructionCodeGeneratorMIPS::VisitStaticFieldSet(HStaticFieldSet* instruction) {
  HandleFieldSet(instruction, instruction->GetFieldInfo(), instruction->GetDexPc());
}

void LocationsBuilderMIPS::VisitUnresolvedInstanceFieldGet(
    HUnresolvedInstanceFieldGet* instruction) {
  FieldAccessCallingConventionMIPS calling_convention;
  codegen_->CreateUnresolvedFieldLocationSummary(instruction,
                                                 instruction->GetFieldType(),
                                                 calling_convention);
}

void InstructionCodeGeneratorMIPS::VisitUnresolvedInstanceFieldGet(
    HUnresolvedInstanceFieldGet* instruction) {
  FieldAccessCallingConventionMIPS calling_convention;
  codegen_->GenerateUnresolvedFieldAccess(instruction,
                                          instruction->GetFieldType(),
                                          instruction->GetFieldIndex(),
                                          instruction->GetDexPc(),
                                          calling_convention);
}

void LocationsBuilderMIPS::VisitUnresolvedInstanceFieldSet(
    HUnresolvedInstanceFieldSet* instruction) {
  FieldAccessCallingConventionMIPS calling_convention;
  codegen_->CreateUnresolvedFieldLocationSummary(instruction,
                                                 instruction->GetFieldType(),
                                                 calling_convention);
}

void InstructionCodeGeneratorMIPS::VisitUnresolvedInstanceFieldSet(
    HUnresolvedInstanceFieldSet* instruction) {
  FieldAccessCallingConventionMIPS calling_convention;
  codegen_->GenerateUnresolvedFieldAccess(instruction,
                                          instruction->GetFieldType(),
                                          instruction->GetFieldIndex(),
                                          instruction->GetDexPc(),
                                          calling_convention);
}

void LocationsBuilderMIPS::VisitUnresolvedStaticFieldGet(
    HUnresolvedStaticFieldGet* instruction) {
  FieldAccessCallingConventionMIPS calling_convention;
  codegen_->CreateUnresolvedFieldLocationSummary(instruction,
                                                 instruction->GetFieldType(),
                                                 calling_convention);
}

void InstructionCodeGeneratorMIPS::VisitUnresolvedStaticFieldGet(
    HUnresolvedStaticFieldGet* instruction) {
  FieldAccessCallingConventionMIPS calling_convention;
  codegen_->GenerateUnresolvedFieldAccess(instruction,
                                          instruction->GetFieldType(),
                                          instruction->GetFieldIndex(),
                                          instruction->GetDexPc(),
                                          calling_convention);
}

void LocationsBuilderMIPS::VisitUnresolvedStaticFieldSet(
    HUnresolvedStaticFieldSet* instruction) {
  FieldAccessCallingConventionMIPS calling_convention;
  codegen_->CreateUnresolvedFieldLocationSummary(instruction,
                                                 instruction->GetFieldType(),
                                                 calling_convention);
}

void InstructionCodeGeneratorMIPS::VisitUnresolvedStaticFieldSet(
    HUnresolvedStaticFieldSet* instruction) {
  FieldAccessCallingConventionMIPS calling_convention;
  codegen_->GenerateUnresolvedFieldAccess(instruction,
                                          instruction->GetFieldType(),
                                          instruction->GetFieldIndex(),
                                          instruction->GetDexPc(),
                                          calling_convention);
}

void LocationsBuilderMIPS::VisitSuspendCheck(HSuspendCheck* instruction) {
  new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kCallOnSlowPath);
}

void InstructionCodeGeneratorMIPS::VisitSuspendCheck(HSuspendCheck* instruction) {
  HBasicBlock* block = instruction->GetBlock();
  if (block->GetLoopInformation() != nullptr) {
    DCHECK(block->GetLoopInformation()->GetSuspendCheck() == instruction);
    // The back edge will generate the suspend check.
    return;
  }
  if (block->IsEntryBlock() && instruction->GetNext()->IsGoto()) {
    // The goto will generate the suspend check.
    return;
  }
  GenerateSuspendCheck(instruction, nullptr);
}

void LocationsBuilderMIPS::VisitTemporary(HTemporary* temp) {
  temp->SetLocations(nullptr);
}

void InstructionCodeGeneratorMIPS::VisitTemporary(HTemporary* temp ATTRIBUTE_UNUSED) {
  // Nothing to do, this is driven by the code generator.
}

void LocationsBuilderMIPS::VisitThrow(HThrow* instruction) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kCall);
  InvokeRuntimeCallingConvention calling_convention;
  locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
}

void InstructionCodeGeneratorMIPS::VisitThrow(HThrow* instruction) {
  codegen_->InvokeRuntime(QUICK_ENTRY_POINT(pDeliverException),
                          instruction,
                          instruction->GetDexPc(),
                          nullptr,
                          IsDirectEntrypoint(kQuickDeliverException));
  CheckEntrypointTypes<kQuickDeliverException, void, mirror::Object*>();
}

void LocationsBuilderMIPS::VisitTypeConversion(HTypeConversion* conversion) {
  Primitive::Type input_type = conversion->GetInputType();
  Primitive::Type result_type = conversion->GetResultType();
  DCHECK_NE(input_type, result_type);

  if ((input_type == Primitive::kPrimNot) || (input_type == Primitive::kPrimVoid) ||
      (result_type == Primitive::kPrimNot) || (result_type == Primitive::kPrimVoid)) {
    LOG(FATAL) << "Unexpected type conversion from " << input_type << " to " << result_type;
  }

  LocationSummary::CallKind call_kind = LocationSummary::kNoCall;
  if ((Primitive::IsFloatingPointType(result_type) && input_type == Primitive::kPrimLong) ||
      (Primitive::IsIntegralType(result_type) && Primitive::IsFloatingPointType(input_type))) {
    call_kind = LocationSummary::kCall;
  }

  LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(conversion, call_kind);

  if (call_kind == LocationSummary::kNoCall) {
    if (Primitive::IsFloatingPointType(input_type)) {
      locations->SetInAt(0, Location::RequiresFpuRegister());
    } else {
      locations->SetInAt(0, Location::RequiresRegister());
    }

    if (Primitive::IsFloatingPointType(result_type)) {
      locations->SetOut(Location::RequiresFpuRegister(), Location::kNoOutputOverlap);
    } else {
      locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
    }
  } else {
    InvokeRuntimeCallingConvention calling_convention;

    if (Primitive::IsFloatingPointType(input_type)) {
      locations->SetInAt(0, Location::FpuRegisterLocation(calling_convention.GetFpuRegisterAt(0)));
    } else {
      DCHECK_EQ(input_type, Primitive::kPrimLong);
      locations->SetInAt(0, Location::RegisterPairLocation(
                 calling_convention.GetRegisterAt(0), calling_convention.GetRegisterAt(1)));
    }

    locations->SetOut(calling_convention.GetReturnLocation(result_type));
  }
}

void InstructionCodeGeneratorMIPS::VisitTypeConversion(HTypeConversion* conversion) {
  LocationSummary* locations = conversion->GetLocations();
  Primitive::Type result_type = conversion->GetResultType();
  Primitive::Type input_type = conversion->GetInputType();
  bool has_sign_extension = codegen_->GetInstructionSetFeatures().IsMipsIsaRevGreaterThanEqual2();

  DCHECK_NE(input_type, result_type);

  if (result_type == Primitive::kPrimLong && Primitive::IsIntegralType(input_type)) {
    Register dst_high = locations->Out().AsRegisterPairHigh<Register>();
    Register dst_low = locations->Out().AsRegisterPairLow<Register>();
    Register src = locations->InAt(0).AsRegister<Register>();

    __ Move(dst_low, src);
    __ Sra(dst_high, src, 31);
  } else if (Primitive::IsIntegralType(result_type) && Primitive::IsIntegralType(input_type)) {
    Register dst = locations->Out().AsRegister<Register>();
    Register src = (input_type == Primitive::kPrimLong)
        ? locations->InAt(0).AsRegisterPairLow<Register>()
        : locations->InAt(0).AsRegister<Register>();

    switch (result_type) {
      case Primitive::kPrimChar:
        __ Andi(dst, src, 0xFFFF);
        break;
      case Primitive::kPrimByte:
        if (has_sign_extension) {
          __ Seb(dst, src);
        } else {
          __ Sll(dst, src, 24);
          __ Sra(dst, dst, 24);
        }
        break;
      case Primitive::kPrimShort:
        if (has_sign_extension) {
          __ Seh(dst, src);
        } else {
          __ Sll(dst, src, 16);
          __ Sra(dst, dst, 16);
        }
        break;
      case Primitive::kPrimInt:
        __ Move(dst, src);
        break;

      default:
        LOG(FATAL) << "Unexpected type conversion from " << input_type
                   << " to " << result_type;
    }
  } else if (Primitive::IsFloatingPointType(result_type) && Primitive::IsIntegralType(input_type)) {
    if (input_type != Primitive::kPrimLong) {
      Register src = locations->InAt(0).AsRegister<Register>();
      FRegister dst = locations->Out().AsFpuRegister<FRegister>();
      __ Mtc1(src, FTMP);
      if (result_type == Primitive::kPrimFloat) {
        __ Cvtsw(dst, FTMP);
      } else {
        __ Cvtdw(dst, FTMP);
      }
    } else {
      int32_t entry_offset = (result_type == Primitive::kPrimFloat) ? QUICK_ENTRY_POINT(pL2f)
                                                                    : QUICK_ENTRY_POINT(pL2d);
      bool direct = (result_type == Primitive::kPrimFloat) ? IsDirectEntrypoint(kQuickL2f)
                                                           : IsDirectEntrypoint(kQuickL2d);
      codegen_->InvokeRuntime(entry_offset,
                              conversion,
                              conversion->GetDexPc(),
                              nullptr,
                              direct);
      if (result_type == Primitive::kPrimFloat) {
        CheckEntrypointTypes<kQuickL2f, float, int64_t>();
      } else {
        CheckEntrypointTypes<kQuickL2d, double, int64_t>();
      }
    }
  } else if (Primitive::IsIntegralType(result_type) && Primitive::IsFloatingPointType(input_type)) {
    CHECK(result_type == Primitive::kPrimInt || result_type == Primitive::kPrimLong);
    int32_t entry_offset;
    bool direct;
    if (result_type != Primitive::kPrimLong) {
      entry_offset = (input_type == Primitive::kPrimFloat) ? QUICK_ENTRY_POINT(pF2iz)
                                                           : QUICK_ENTRY_POINT(pD2iz);
      direct = (result_type == Primitive::kPrimFloat) ? IsDirectEntrypoint(kQuickF2iz)
                                                      : IsDirectEntrypoint(kQuickD2iz);
    } else {
      entry_offset = (input_type == Primitive::kPrimFloat) ? QUICK_ENTRY_POINT(pF2l)
                                                           : QUICK_ENTRY_POINT(pD2l);
      direct = (result_type == Primitive::kPrimFloat) ? IsDirectEntrypoint(kQuickF2l)
                                                      : IsDirectEntrypoint(kQuickD2l);
    }
    codegen_->InvokeRuntime(entry_offset,
                            conversion,
                            conversion->GetDexPc(),
                            nullptr,
                            direct);
    if (result_type != Primitive::kPrimLong) {
      if (input_type == Primitive::kPrimFloat) {
        CheckEntrypointTypes<kQuickF2iz, int32_t, float>();
      } else {
        CheckEntrypointTypes<kQuickD2iz, int32_t, double>();
      }
    } else {
      if (input_type == Primitive::kPrimFloat) {
        CheckEntrypointTypes<kQuickF2l, int64_t, float>();
      } else {
        CheckEntrypointTypes<kQuickD2l, int64_t, double>();
      }
    }
  } else if (Primitive::IsFloatingPointType(result_type) &&
             Primitive::IsFloatingPointType(input_type)) {
    FRegister dst = locations->Out().AsFpuRegister<FRegister>();
    FRegister src = locations->InAt(0).AsFpuRegister<FRegister>();
    if (result_type == Primitive::kPrimFloat) {
      __ Cvtsd(dst, src);
    } else {
      __ Cvtds(dst, src);
    }
  } else {
    LOG(FATAL) << "Unexpected or unimplemented type conversion from " << input_type
                << " to " << result_type;
  }
}

void LocationsBuilderMIPS::VisitUShr(HUShr* ushr) {
  HandleShift(ushr);
}

void InstructionCodeGeneratorMIPS::VisitUShr(HUShr* ushr) {
  HandleShift(ushr);
}

void LocationsBuilderMIPS::VisitXor(HXor* instruction) {
  HandleBinaryOp(instruction);
}

void InstructionCodeGeneratorMIPS::VisitXor(HXor* instruction) {
  HandleBinaryOp(instruction);
}

void LocationsBuilderMIPS::VisitBoundType(HBoundType* instruction ATTRIBUTE_UNUSED) {
  // Nothing to do, this should be removed during prepare for register allocator.
  LOG(FATAL) << "Unreachable";
}

void InstructionCodeGeneratorMIPS::VisitBoundType(HBoundType* instruction ATTRIBUTE_UNUSED) {
  // Nothing to do, this should be removed during prepare for register allocator.
  LOG(FATAL) << "Unreachable";
}

void LocationsBuilderMIPS::VisitEqual(HEqual* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitEqual(HEqual* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitNotEqual(HNotEqual* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitNotEqual(HNotEqual* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitLessThan(HLessThan* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitLessThan(HLessThan* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitLessThanOrEqual(HLessThanOrEqual* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitLessThanOrEqual(HLessThanOrEqual* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitGreaterThan(HGreaterThan* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitGreaterThan(HGreaterThan* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitGreaterThanOrEqual(HGreaterThanOrEqual* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitGreaterThanOrEqual(HGreaterThanOrEqual* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitBelow(HBelow* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitBelow(HBelow* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitBelowOrEqual(HBelowOrEqual* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitBelowOrEqual(HBelowOrEqual* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitAbove(HAbove* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitAbove(HAbove* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitAboveOrEqual(HAboveOrEqual* comp) {
  VisitCondition(comp);
}

void InstructionCodeGeneratorMIPS::VisitAboveOrEqual(HAboveOrEqual* comp) {
  VisitCondition(comp);
}

void LocationsBuilderMIPS::VisitFakeString(HFakeString* instruction) {
  DCHECK(codegen_->IsBaseline());
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kNoCall);
  locations->SetOut(Location::ConstantLocation(GetGraph()->GetNullConstant()));
}

void InstructionCodeGeneratorMIPS::VisitFakeString(HFakeString* instruction ATTRIBUTE_UNUSED) {
  DCHECK(codegen_->IsBaseline());
  // Will be generated at use site.
}

void LocationsBuilderMIPS::VisitPackedSwitch(HPackedSwitch* switch_instr) {
  LocationSummary* locations =
      new (GetGraph()->GetArena()) LocationSummary(switch_instr, LocationSummary::kNoCall);
  locations->SetInAt(0, Location::RequiresRegister());
}

void InstructionCodeGeneratorMIPS::VisitPackedSwitch(HPackedSwitch* switch_instr) {
  int32_t lower_bound = switch_instr->GetStartValue();
  int32_t num_entries = switch_instr->GetNumEntries();
  LocationSummary* locations = switch_instr->GetLocations();
  Register value_reg = locations->InAt(0).AsRegister<Register>();
  HBasicBlock* default_block = switch_instr->GetDefaultBlock();

  // Create a set of compare/jumps.
  const ArenaVector<HBasicBlock*>& successors = switch_instr->GetBlock()->GetSuccessors();
  for (int32_t i = 0; i < num_entries; ++i) {
    int32_t case_value = lower_bound + i;
    MipsLabel* successor_label = codegen_->GetLabelOf(successors[i]);
    if (case_value == 0) {
      __ Beqz(value_reg, successor_label);
    } else {
      __ LoadConst32(TMP, case_value);
      __ Beq(value_reg, TMP, successor_label);
    }
  }

  // Insert the default branch for every other value.
  if (!codegen_->GoesToNextBlock(switch_instr->GetBlock(), default_block)) {
    __ B(codegen_->GetLabelOf(default_block));
  }
}

void LocationsBuilderMIPS::VisitInvokeUnresolved(HInvokeUnresolved* invoke) {
  // The trampoline uses the same calling convention as dex calling conventions,
  // except instead of loading arg0/r0 with the target Method*, arg0/r0 will contain
  // the method_idx.
  HandleInvoke(invoke);
}

void InstructionCodeGeneratorMIPS::VisitInvokeUnresolved(HInvokeUnresolved* invoke) {
  codegen_->GenerateInvokeUnresolvedRuntimeCall(invoke);
}

#undef __
#undef QUICK_ENTRY_POINT

}  // namespace mips
}  // namespace art