maglev-assembler-x64-inl.h

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// Copyright 2022 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef V8_MAGLEV_X64_MAGLEV_ASSEMBLER_X64_INL_H_
#define V8_MAGLEV_X64_MAGLEV_ASSEMBLER_X64_INL_H_
 
#include <tuple>
#include <type_traits>
#include <utility>
 
#include "src/codegen/interface-descriptors-inl.h"
#include "src/codegen/macro-assembler-inl.h"
#include "src/codegen/x64/assembler-x64.h"
#include "src/common/globals.h"
#include "src/compiler/compilation-dependencies.h"
#include "src/maglev/maglev-assembler.h"
#include "src/maglev/maglev-basic-block.h"
#include "src/maglev/maglev-code-gen-state.h"
 
namespace v8 {
namespace internal {
namespace maglev {
 
constexpr Condition ConditionForFloat64(Operation operation) {
  switch (operation) {
    case Operation::kEqual:
    case Operation::kStrictEqual:
      return equal;
    case Operation::kLessThan:
      return below;
    case Operation::kLessThanOrEqual:
      return below_equal;
    case Operation::kGreaterThan:
      return above;
    case Operation::kGreaterThanOrEqual:
      return above_equal;
    default:
      UNREACHABLE();
  }
}
 
constexpr Condition ConditionForNaN() { return parity_even; }
 
inline ScaleFactor ScaleFactorFromInt(int n) {
  switch (n) {
    case 1:
      return times_1;
    case 2:
      return times_2;
    case 4:
      return times_4;
    case 8:
      return times_8;
    default:
      UNREACHABLE();
  }
}
 
class MaglevAssembler::TemporaryRegisterScope
    : public TemporaryRegisterScopeBase<TemporaryRegisterScope> {
  using Base = TemporaryRegisterScopeBase<TemporaryRegisterScope>;
 
 public:
  struct SavedData : public Base::SavedData {
    bool has_scratch_register_;
    bool has_double_scratch_register_;
  };
 
  explicit TemporaryRegisterScope(MaglevAssembler* masm)
      : Base(masm),
        has_scratch_register_(prev_scope_ ? prev_scope_->has_scratch_register_
                                          : true),
        has_double_scratch_register_(
            prev_scope_ ? prev_scope_->has_double_scratch_register_ : true) {}
  explicit TemporaryRegisterScope(MaglevAssembler* masm,
                                  const SavedData& saved_data)
      : Base(masm, saved_data),
        has_scratch_register_(saved_data.has_scratch_register_),
        has_double_scratch_register_(saved_data.has_double_scratch_register_) {}
 
  Register AcquireScratch() {
    CHECK(has_scratch_register_);
    has_scratch_register_ = false;
    return kScratchRegister;
  }
  DoubleRegister AcquireScratchDouble() {
    CHECK(has_double_scratch_register_);
    has_double_scratch_register_ = false;
    return kScratchDoubleReg;
  }
  void IncludeScratch(Register reg) {
    DCHECK_EQ(reg, kScratchRegister);
    has_scratch_register_ = true;
  }
 
  SavedData CopyForDefer() {
    return SavedData{
        CopyForDeferBase(),
        has_scratch_register_,
        has_double_scratch_register_,
    };
  }
 
  void ResetToDefaultImpl() {
    has_scratch_register_ = true;
    has_double_scratch_register_ = true;
  }
 
 private:
  bool has_scratch_register_;
  bool has_double_scratch_register_;
};
 
inline MapCompare::MapCompare(MaglevAssembler* masm, Register object,
                              size_t map_count)
    : masm_(masm), object_(object), map_count_(map_count) {
  if (map_count_ != 1) {
    map_ = masm_->scratch_register_scope()->Acquire();
    masm_->LoadMap(map_, object_);
  }
}
 
void MapCompare::Generate(Handle<Map> map, Condition cond, Label* if_true,
                          Label::Distance distance) {
  if (map_count_ == 1) {
    masm_->Cmp(FieldOperand(object_, HeapObject::kMapOffset), map);
    masm_->JumpIf(cond, if_true, distance);
  } else {
    masm_->CompareTaggedAndJumpIf(map_, map, cond, if_true, distance);
  }
}
 
Register MapCompare::GetMap() {
  if (map_count_ == 1) {
    DCHECK_EQ(map_, Register::no_reg());
    // Load the map; the object is in register_for_map_compare_. This
    // avoids loading the map in the fast path of CheckMapsWithMigration.
    masm_->LoadMap(kScratchRegister, object_);
    return kScratchRegister;
  } else {
    DCHECK_NE(map_, Register::no_reg());
    return map_;
  }
}
 
int MapCompare::TemporaryCount(size_t map_count) {
  return map_count == 1 ? 0 : 1;
}
 
namespace detail {
 
template <typename... Args>
struct PushAllHelper;
 
template <>
struct PushAllHelper<> {
  static void Push(MaglevAssembler* masm) {}
  static void PushReverse(MaglevAssembler* masm) {}
};
 
inline void PushInput(MaglevAssembler* masm, const Input& input) {
  if (input.operand().IsConstant()) {
    input.node()->LoadToRegister(masm, kScratchRegister);
    masm->Push(kScratchRegister);
  } else {
    // TODO(leszeks): Consider special casing the value. (Toon: could possibly
    // be done through Input directly?)
    const compiler::AllocatedOperand& operand =
        compiler::AllocatedOperand::cast(input.operand());
 
    if (operand.IsRegister()) {
      masm->Push(operand.GetRegister());
    } else {
      DCHECK(operand.IsStackSlot());
      masm->Push(masm->GetStackSlot(operand));
    }
  }
}
 
template <typename T, typename... Args>
inline void PushIterator(MaglevAssembler* masm, base::iterator_range<T> range,
                         Args... args) {
  for (auto iter = range.begin(), end = range.end(); iter != end; ++iter) {
    masm->Push(*iter);
  }
  PushAllHelper<Args...>::Push(masm, args...);
}
 
template <typename T, typename... Args>
inline void PushIteratorReverse(MaglevAssembler* masm,
                                base::iterator_range<T> range, Args... args) {
  PushAllHelper<Args...>::PushReverse(masm, args...);
  for (auto iter = range.rbegin(), end = range.rend(); iter != end; ++iter) {
    masm->Push(*iter);
  }
}
 
template <typename... Args>
struct PushAllHelper<Input, Args...> {
  static void Push(MaglevAssembler* masm, const Input& arg, Args... args) {
    PushInput(masm, arg);
    PushAllHelper<Args...>::Push(masm, args...);
  }
  static void PushReverse(MaglevAssembler* masm, const Input& arg,
                          Args... args) {
    PushAllHelper<Args...>::PushReverse(masm, args...);
    PushInput(masm, arg);
  }
};
template <typename Arg, typename... Args>
struct PushAllHelper<Arg, Args...> {
  static void Push(MaglevAssembler* masm, Arg arg, Args... args) {
    if constexpr (is_iterator_range<Arg>::value) {
      PushIterator(masm, arg, args...);
    } else {
      masm->MacroAssembler::Push(arg);
      PushAllHelper<Args...>::Push(masm, args...);
    }
  }
  static void PushReverse(MaglevAssembler* masm, Arg arg, Args... args) {
    if constexpr (is_iterator_range<Arg>::value) {
      PushIteratorReverse(masm, arg, args...);
    } else {
      PushAllHelper<Args...>::PushReverse(masm, args...);
      masm->Push(arg);
    }
  }
};
 
}  // namespace detail
 
template <typename... T>
void MaglevAssembler::Push(T... vals) {
  detail::PushAllHelper<T...>::Push(this, vals...);
}
 
template <typename... T>
void MaglevAssembler::PushReverse(T... vals) {
  detail::PushAllHelper<T...>::PushReverse(this, vals...);
}
 
inline void MaglevAssembler::BindJumpTarget(Label* label) {
  MacroAssembler::BindJumpTarget(label);
}
 
inline void MaglevAssembler::BindBlock(BasicBlock* block) {
  bind(block->label());
}
 
inline void MaglevAssembler::SmiTagInt32AndSetFlags(Register dst,
                                                    Register src) {
  Move(dst, src);
  if (SmiValuesAre31Bits()) {
    addl(dst, dst);
  } else {
    SmiTag(dst);
  }
}
 
inline void MaglevAssembler::CheckInt32IsSmi(Register obj, Label* fail,
                                             Register scratch) {
  DCHECK(!SmiValuesAre32Bits());
 
  if (scratch == Register::no_reg()) {
    scratch = kScratchRegister;
  }
  movl(scratch, obj);
  addl(scratch, scratch);
  JumpIf(kOverflow, fail);
}
 
inline void MaglevAssembler::SmiAddConstant(Register dst, Register src,
                                            int value, Label* fail,
                                            Label::Distance distance) {
  AssertSmi(src);
  Move(dst, src);
  if (value != 0) {
    if (SmiValuesAre31Bits()) {
      addl(dst, Immediate(Smi::FromInt(value)));
    } else {
      DCHECK(!AreAliased(dst, kScratchRegister));
      Move(kScratchRegister, Smi::FromInt(value));
      addq(dst, kScratchRegister);
    }
    JumpIf(kOverflow, fail, distance);
  }
}
 
inline void MaglevAssembler::SmiSubConstant(Register dst, Register src,
                                            int value, Label* fail,
                                            Label::Distance distance) {
  AssertSmi(src);
  Move(dst, src);
  if (value != 0) {
    if (SmiValuesAre31Bits()) {
      subl(dst, Immediate(Smi::FromInt(value)));
    } else {
      DCHECK(!AreAliased(dst, kScratchRegister));
      Move(kScratchRegister, Smi::FromInt(value));
      subq(dst, kScratchRegister);
    }
    JumpIf(kOverflow, fail, distance);
  }
}
 
inline void MaglevAssembler::MoveHeapNumber(Register dst, double value) {
  movq_heap_number(dst, value);
}
 
inline Condition MaglevAssembler::IsRootConstant(Input input,
                                                 RootIndex root_index) {
  if (input.operand().IsRegister()) {
    CompareRoot(ToRegister(input), root_index);
  } else {
    DCHECK(input.operand().IsStackSlot());
    CompareRoot(ToMemOperand(input), root_index);
  }
  return equal;
}
 
inline Register MaglevAssembler::GetFramePointer() { return rbp; }
 
inline MemOperand MaglevAssembler::GetStackSlot(
    const compiler::AllocatedOperand& operand) {
  return MemOperand(rbp, GetFramePointerOffsetForStackSlot(operand));
}
 
inline MemOperand MaglevAssembler::ToMemOperand(
    const compiler::InstructionOperand& operand) {
  return GetStackSlot(compiler::AllocatedOperand::cast(operand));
}
 
inline MemOperand MaglevAssembler::ToMemOperand(const ValueLocation& location) {
  return ToMemOperand(location.operand());
}
 
inline void MaglevAssembler::BuildTypedArrayDataPointer(Register data_pointer,
                                                        Register object) {
  DCHECK_NE(data_pointer, object);
  LoadExternalPointerField(
      data_pointer, FieldOperand(object, JSTypedArray::kExternalPointerOffset));
  if (JSTypedArray::kMaxSizeInHeap == 0) return;
 
  Register base = kScratchRegister;
  if (COMPRESS_POINTERS_BOOL) {
    movl(base, FieldOperand(object, JSTypedArray::kBasePointerOffset));
  } else {
    movq(base, FieldOperand(object, JSTypedArray::kBasePointerOffset));
  }
  addq(data_pointer, base);
}
 
inline MemOperand MaglevAssembler::TypedArrayElementOperand(
    Register data_pointer, Register index, int element_size) {
  return Operand(data_pointer, index, ScaleFactorFromInt(element_size), 0);
}
 
inline MemOperand MaglevAssembler::DataViewElementOperand(Register data_pointer,
                                                          Register index) {
  return Operand(data_pointer, index, times_1, 0);
}
 
inline void MaglevAssembler::LoadTaggedFieldByIndex(Register result,
                                                    Register object,
                                                    Register index, int scale,
                                                    int offset) {
  LoadTaggedField(
      result, FieldOperand(object, index, ScaleFactorFromInt(scale), offset));
}
 
inline void MaglevAssembler::LoadBoundedSizeFromObject(Register result,
                                                       Register object,
                                                       int offset) {
  movq(result, FieldOperand(object, offset));
#ifdef V8_ENABLE_SANDBOX
  shrq(result, Immediate(kBoundedSizeShift));
#endif  // V8_ENABLE_SANDBOX
}
 
inline void MaglevAssembler::LoadExternalPointerField(Register result,
                                                      Operand operand) {
#ifdef V8_ENABLE_SANDBOX
  LoadSandboxedPointerField(result, operand);
#else
  movq(result, operand);
#endif
}
 
void MaglevAssembler::LoadFixedArrayElement(Register result, Register array,
                                            Register index) {
  if (v8_flags.debug_code) {
    AssertObjectType(array, FIXED_ARRAY_TYPE, AbortReason::kUnexpectedValue);
    CompareInt32AndAssert(index, 0, kUnsignedGreaterThanEqual,
                          AbortReason::kUnexpectedNegativeValue);
  }
  LoadTaggedFieldByIndex(result, array, index, kTaggedSize,
                         OFFSET_OF_DATA_START(FixedArray));
}
 
inline void MaglevAssembler::LoadTaggedFieldWithoutDecompressing(
    Register result, Register object, int offset) {
  MacroAssembler::LoadTaggedFieldWithoutDecompressing(
      result, FieldMemOperand(object, offset));
}
 
void MaglevAssembler::LoadFixedArrayElementWithoutDecompressing(
    Register result, Register array, Register index) {
  if (v8_flags.debug_code) {
    AssertObjectType(array, FIXED_ARRAY_TYPE, AbortReason::kUnexpectedValue);
    CompareInt32AndAssert(index, 0, kUnsignedGreaterThanEqual,
                          AbortReason::kUnexpectedNegativeValue);
  }
  MacroAssembler::LoadTaggedFieldWithoutDecompressing(
      result, FieldOperand(array, index, times_tagged_size,
                           OFFSET_OF_DATA_START(FixedArray)));
}
 
void MaglevAssembler::LoadFixedDoubleArrayElement(DoubleRegister result,
                                                  Register array,
                                                  Register index) {
  if (v8_flags.debug_code) {
    AssertObjectType(array, FIXED_DOUBLE_ARRAY_TYPE,
                     AbortReason::kUnexpectedValue);
    CompareInt32AndAssert(index, 0, kUnsignedGreaterThanEqual,
                          AbortReason::kUnexpectedNegativeValue);
  }
  Movsd(result, FieldOperand(array, index, times_8,
                             OFFSET_OF_DATA_START(FixedDoubleArray)));
}
 
inline void MaglevAssembler::StoreFixedDoubleArrayElement(
    Register array, Register index, DoubleRegister value) {
  Movsd(FieldOperand(array, index, times_8,
                     OFFSET_OF_DATA_START(FixedDoubleArray)),
        value);
}
 
inline void MaglevAssembler::LoadSignedField(Register result, Operand operand,
                                             int size) {
  if (size == 1) {
    movsxbl(result, operand);
  } else if (size == 2) {
    movsxwl(result, operand);
  } else {
    DCHECK_EQ(size, 4);
    movl(result, operand);
  }
}
 
inline void MaglevAssembler::LoadUnsignedField(Register result, Operand operand,
                                               int size) {
  if (size == 1) {
    movzxbl(result, operand);
  } else if (size == 2) {
    movzxwl(result, operand);
  } else {
    DCHECK_EQ(size, 4);
    movl(result, operand);
  }
}
 
inline void MaglevAssembler::SetSlotAddressForTaggedField(Register slot_reg,
                                                          Register object,
                                                          int offset) {
  leaq(slot_reg, FieldOperand(object, offset));
}
inline void MaglevAssembler::SetSlotAddressForFixedArrayElement(
    Register slot_reg, Register object, Register index) {
  leaq(slot_reg, FieldOperand(object, index, times_tagged_size,
                              OFFSET_OF_DATA_START(FixedArray)));
}
 
inline void MaglevAssembler::StoreTaggedFieldNoWriteBarrier(Register object,
                                                            int offset,
                                                            Register value) {
  MacroAssembler::StoreTaggedField(FieldOperand(object, offset), value);
}
 
inline void MaglevAssembler::StoreFixedArrayElementNoWriteBarrier(
    Register array, Register index, Register value) {
  MacroAssembler::StoreTaggedField(
      FieldOperand(array, index, times_tagged_size,
                   OFFSET_OF_DATA_START(FixedArray)),
      value);
}
 
inline void MaglevAssembler::StoreTaggedSignedField(Register object, int offset,
                                                    Register value) {
  AssertSmi(value);
  MacroAssembler::StoreTaggedField(FieldOperand(object, offset), value);
}
 
inline void MaglevAssembler::StoreTaggedSignedField(Register object, int offset,
                                                    Tagged<Smi> value) {
  MacroAssembler::StoreTaggedSignedField(FieldOperand(object, offset), value);
}
 
inline void MaglevAssembler::StoreInt32Field(Register object, int offset,
                                             int32_t value) {
  movl(FieldOperand(object, offset), Immediate(value));
}
 
inline void MaglevAssembler::StoreField(Operand operand, Register value,
                                        int size) {
  DCHECK(size == 1 || size == 2 || size == 4);
  if (size == 1) {
    movb(operand, value);
  } else if (size == 2) {
    movw(operand, value);
  } else {
    DCHECK_EQ(size, 4);
    movl(operand, value);
  }
}
 
#ifdef V8_ENABLE_SANDBOX
 
inline void MaglevAssembler::StoreTrustedPointerFieldNoWriteBarrier(
    Register object, int offset, Register value) {
  MacroAssembler::StoreTrustedPointerField(FieldOperand(object, offset), value);
}
 
#endif  // V8_ENABLE_SANDBOX
 
inline void MaglevAssembler::ReverseByteOrder(Register value, int size) {
  if (size == 2) {
    bswapl(value);
    sarl(value, Immediate(16));
  } else if (size == 4) {
    bswapl(value);
  } else {
    DCHECK_EQ(size, 1);
  }
}
 
inline MemOperand MaglevAssembler::StackSlotOperand(StackSlot stack_slot) {
  return MemOperand(rbp, stack_slot.index);
}
 
inline void MaglevAssembler::IncrementInt32(Register reg) { incl(reg); }
 
inline void MaglevAssembler::DecrementInt32(Register reg) { decl(reg); }
 
inline void MaglevAssembler::AddInt32(Register reg, int amount) {
  addl(reg, Immediate(amount));
}
 
inline void MaglevAssembler::AndInt32(Register reg, int mask) {
  andl(reg, Immediate(mask));
}
 
inline void MaglevAssembler::OrInt32(Register reg, int mask) {
  orl(reg, Immediate(mask));
}
 
inline void MaglevAssembler::AndInt32(Register reg, Register other) {
  andl(reg, other);
}
 
inline void MaglevAssembler::OrInt32(Register reg, Register other) {
  orl(reg, other);
}
 
inline void MaglevAssembler::ShiftLeft(Register reg, int amount) {
  shll(reg, Immediate(amount));
}
 
inline void MaglevAssembler::IncrementAddress(Register reg, int32_t delta) {
  leaq(reg, MemOperand(reg, delta));
}
 
inline void MaglevAssembler::LoadAddress(Register dst, MemOperand location) {
  leaq(dst, location);
}
 
inline void MaglevAssembler::Call(Label* target) { call(target); }
 
inline void MaglevAssembler::EmitEnterExitFrame(int extra_slots,
                                                StackFrame::Type frame_type,
                                                Register c_function,
                                                Register scratch) {
  EnterExitFrame(extra_slots, frame_type, c_function);
}
 
inline void MaglevAssembler::Move(StackSlot dst, Register src) {
  movq(StackSlotOperand(dst), src);
}
 
inline void MaglevAssembler::Move(StackSlot dst, DoubleRegister src) {
  Movsd(StackSlotOperand(dst), src);
}
 
inline void MaglevAssembler::Move(Register dst, StackSlot src) {
  movq(dst, StackSlotOperand(src));
}
 
inline void MaglevAssembler::Move(DoubleRegister dst, StackSlot src) {
  Movsd(dst, StackSlotOperand(src));
}
 
inline void MaglevAssembler::Move(MemOperand dst, Register src) {
  movq(dst, src);
}
 
inline void MaglevAssembler::Move(Register dst, Tagged<TaggedIndex> i) {
  MacroAssembler::Move(dst, i);
}
 
inline void MaglevAssembler::Move(DoubleRegister dst, DoubleRegister src) {
  MacroAssembler::Move(dst, src);
}
 
inline void MaglevAssembler::Move(Register dst, Tagged<Smi> src) {
  MacroAssembler::Move(dst, src);
}
 
inline void MaglevAssembler::Move(Register dst, ExternalReference src) {
  MacroAssembler::Move(dst, src);
}
 
inline void MaglevAssembler::Move(Register dst, MemOperand src) {
  MacroAssembler::Move(dst, src);
}
 
inline void MaglevAssembler::Move(Register dst, Register src) {
  MacroAssembler::Move(dst, src);
}
 
inline void MaglevAssembler::Move(Register dst, int32_t i) {
  // Move as a uint32 to avoid sign extension.
  MacroAssembler::Move(dst, static_cast<uint32_t>(i));
}
 
inline void MaglevAssembler::Move(Register dst, uint32_t i) {
  // Move as a uint32 to avoid sign extension.
  MacroAssembler::Move(dst, i);
}
 
inline void MaglevAssembler::Move(Register dst, IndirectPointerTag i) {
  MacroAssembler::Move(dst, i);
}
 
inline void MaglevAssembler::Move(DoubleRegister dst, double n) {
  MacroAssembler::Move(dst, n);
}
 
inline void MaglevAssembler::Move(DoubleRegister dst, Float64 n) {
  MacroAssembler::Move(dst, n.get_bits());
}
 
inline void MaglevAssembler::Move(Register dst, Handle<HeapObject> obj) {
  MacroAssembler::Move(dst, obj);
}
 
void MaglevAssembler::MoveTagged(Register dst, Handle<HeapObject> obj) {
#ifdef V8_COMPRESS_POINTERS
  MacroAssembler::Move(dst, obj, RelocInfo::COMPRESSED_EMBEDDED_OBJECT);
#else
  MacroAssembler::Move(dst, obj);
#endif
}
 
inline void MaglevAssembler::LoadInt32(Register dst, MemOperand src) {
  movl(dst, src);
}
 
inline void MaglevAssembler::StoreInt32(MemOperand dst, Register src) {
  movl(dst, src);
}
 
inline void MaglevAssembler::LoadFloat32(DoubleRegister dst, MemOperand src) {
  Movss(dst, src);
  Cvtss2sd(dst, dst);
}
inline void MaglevAssembler::StoreFloat32(MemOperand dst, DoubleRegister src) {
  Cvtsd2ss(kScratchDoubleReg, src);
  Movss(dst, kScratchDoubleReg);
}
inline void MaglevAssembler::LoadFloat64(DoubleRegister dst, MemOperand src) {
  Movsd(dst, src);
}
inline void MaglevAssembler::StoreFloat64(MemOperand dst, DoubleRegister src) {
  Movsd(dst, src);
}
 
inline void MaglevAssembler::LoadUnalignedFloat64(DoubleRegister dst,
                                                  Register base,
                                                  Register index) {
  LoadFloat64(dst, Operand(base, index, times_1, 0));
}
inline void MaglevAssembler::LoadUnalignedFloat64AndReverseByteOrder(
    DoubleRegister dst, Register base, Register index) {
  movq(kScratchRegister, Operand(base, index, times_1, 0));
  bswapq(kScratchRegister);
  Movq(dst, kScratchRegister);
}
inline void MaglevAssembler::StoreUnalignedFloat64(Register base,
                                                   Register index,
                                                   DoubleRegister src) {
  StoreFloat64(Operand(base, index, times_1, 0), src);
}
inline void MaglevAssembler::ReverseByteOrderAndStoreUnalignedFloat64(
    Register base, Register index, DoubleRegister src) {
  Movq(kScratchRegister, src);
  bswapq(kScratchRegister);
  movq(Operand(base, index, times_1, 0), kScratchRegister);
}
 
inline void MaglevAssembler::SignExtend32To64Bits(Register dst, Register src) {
  movsxlq(dst, src);
}
inline void MaglevAssembler::NegateInt32(Register val) { negl(val); }
 
inline void MaglevAssembler::ToUint8Clamped(Register result,
                                            DoubleRegister value, Label* min,
                                            Label* max, Label* done) {
  DCHECK(CpuFeatures::IsSupported(SSE4_1));
  Move(kScratchDoubleReg, 0.0);
  Ucomisd(kScratchDoubleReg, value);
  // Set to 0 if NaN.
  j(parity_even, min);
  j(above_equal, min);
  Move(kScratchDoubleReg, 255.0);
  Ucomisd(value, kScratchDoubleReg);
  j(above_equal, max);
  // if value in [0, 255], then round up to the nearest.
  Roundsd(kScratchDoubleReg, value, kRoundToNearest);
  TruncateDoubleToInt32(result, kScratchDoubleReg);
  jmp(done);
}
 
template <typename NodeT>
inline void MaglevAssembler::DeoptIfBufferDetached(Register array,
                                                   Register scratch,
                                                   NodeT* node) {
  // A detached buffer leads to megamorphic feedback, so we won't have a deopt
  // loop if we deopt here.
  LoadTaggedField(scratch,
                  FieldOperand(array, JSArrayBufferView::kBufferOffset));
  LoadTaggedField(scratch,
                  FieldOperand(scratch, JSArrayBuffer::kBitFieldOffset));
  testl(scratch, Immediate(JSArrayBuffer::WasDetachedBit::kMask));
  EmitEagerDeoptIf(not_zero, DeoptimizeReason::kArrayBufferWasDetached, node);
}
 
inline void MaglevAssembler::LoadByte(Register dst, MemOperand src) {
  movzxbl(dst, src);
}
 
inline Condition MaglevAssembler::IsCallableAndNotUndetectable(
    Register map, Register scratch) {
  movb(scratch, FieldOperand(map, Map::kBitFieldOffset));
  andl(scratch, Immediate(Map::Bits1::IsUndetectableBit::kMask |
                          Map::Bits1::IsCallableBit::kMask));
  cmpl(scratch, Immediate(Map::Bits1::IsCallableBit::kMask));
  return kEqual;
}
 
inline Condition MaglevAssembler::IsNotCallableNorUndetactable(
    Register map, Register scratch) {
  testb(FieldOperand(map, Map::kBitFieldOffset),
        Immediate(Map::Bits1::IsUndetectableBit::kMask |
                  Map::Bits1::IsCallableBit::kMask));
  return kEqual;
}
 
inline void MaglevAssembler::LoadInstanceType(Register instance_type,
                                              Register heap_object) {
  LoadMap(instance_type, heap_object);
  movzxwl(instance_type, FieldOperand(instance_type, Map::kInstanceTypeOffset));
}
 
inline void MaglevAssembler::JumpIfObjectType(Register heap_object,
                                              InstanceType type, Label* target,
                                              Label::Distance distance) {
  IsObjectType(heap_object, type, kScratchRegister);
  JumpIf(kEqual, target, distance);
}
 
inline void MaglevAssembler::JumpIfNotObjectType(Register heap_object,
                                                 InstanceType type,
                                                 Label* target,
                                                 Label::Distance distance) {
  IsObjectType(heap_object, type, kScratchRegister);
  JumpIf(kNotEqual, target, distance);
}
 
inline void MaglevAssembler::AssertObjectType(Register heap_object,
                                              InstanceType type,
                                              AbortReason reason) {
  AssertNotSmi(heap_object);
  IsObjectType(heap_object, type, kScratchRegister);
  Assert(kEqual, reason);
}
 
inline void MaglevAssembler::BranchOnObjectType(
    Register heap_object, InstanceType type, Label* if_true,
    Label::Distance true_distance, bool fallthrough_when_true, Label* if_false,
    Label::Distance false_distance, bool fallthrough_when_false) {
  IsObjectType(heap_object, type, kScratchRegister);
  Branch(kEqual, if_true, true_distance, fallthrough_when_true, if_false,
         false_distance, fallthrough_when_false);
}
 
inline void MaglevAssembler::JumpIfObjectTypeInRange(Register heap_object,
                                                     InstanceType lower_limit,
                                                     InstanceType higher_limit,
                                                     Label* target,
                                                     Label::Distance distance) {
  IsObjectTypeInRange(heap_object, lower_limit, higher_limit, kScratchRegister);
  JumpIf(kUnsignedLessThanEqual, target, distance);
}
 
inline void MaglevAssembler::JumpIfObjectTypeNotInRange(
    Register heap_object, InstanceType lower_limit, InstanceType higher_limit,
    Label* target, Label::Distance distance) {
  IsObjectTypeInRange(heap_object, lower_limit, higher_limit, kScratchRegister);
  JumpIf(kUnsignedGreaterThan, target, distance);
}
 
inline void MaglevAssembler::AssertObjectTypeInRange(Register heap_object,
                                                     InstanceType lower_limit,
                                                     InstanceType higher_limit,
                                                     AbortReason reason) {
  AssertNotSmi(heap_object);
  IsObjectTypeInRange(heap_object, lower_limit, higher_limit, kScratchRegister);
  Assert(kUnsignedLessThanEqual, reason);
}
 
inline void MaglevAssembler::BranchOnObjectTypeInRange(
    Register heap_object, InstanceType lower_limit, InstanceType higher_limit,
    Label* if_true, Label::Distance true_distance, bool fallthrough_when_true,
    Label* if_false, Label::Distance false_distance,
    bool fallthrough_when_false) {
  IsObjectTypeInRange(heap_object, lower_limit, higher_limit, kScratchRegister);
  Branch(kUnsignedLessThanEqual, if_true, true_distance, fallthrough_when_true,
         if_false, false_distance, fallthrough_when_false);
}
 
inline void MaglevAssembler::JumpIfJSAnyIsNotPrimitive(
    Register heap_object, Label* target, Label::Distance distance) {
  MacroAssembler::JumpIfJSAnyIsNotPrimitive(heap_object, kScratchRegister,
                                            target, distance);
}
 
#if V8_STATIC_ROOTS_BOOL
inline void MaglevAssembler::JumpIfObjectInRange(Register heap_object,
                                                 Tagged_t lower_limit,
                                                 Tagged_t higher_limit,
                                                 Label* target,
                                                 Label::Distance distance) {
  // Only allowed for comparisons against RORoots.
  DCHECK_LE(lower_limit, StaticReadOnlyRoot::kLastAllocatedRoot);
  DCHECK_LE(higher_limit, StaticReadOnlyRoot::kLastAllocatedRoot);
  AssertNotSmi(heap_object);
  CompareRange(heap_object, lower_limit, higher_limit);
  JumpIf(kUnsignedLessThanEqual, target, distance);
}
 
inline void MaglevAssembler::JumpIfObjectNotInRange(Register heap_object,
                                                    Tagged_t lower_limit,
                                                    Tagged_t higher_limit,
                                                    Label* target,
                                                    Label::Distance distance) {
  // Only allowed for comparisons against RORoots.
  DCHECK_LE(lower_limit, StaticReadOnlyRoot::kLastAllocatedRoot);
  DCHECK_LE(higher_limit, StaticReadOnlyRoot::kLastAllocatedRoot);
  AssertNotSmi(heap_object);
  CompareRange(heap_object, lower_limit, higher_limit);
  JumpIf(kUnsignedGreaterThan, target, distance);
}
 
inline void MaglevAssembler::AssertObjectInRange(Register heap_object,
                                                 Tagged_t lower_limit,
                                                 Tagged_t higher_limit,
                                                 AbortReason reason) {
  // Only allowed for comparisons against RORoots.
  DCHECK_LE(lower_limit, StaticReadOnlyRoot::kLastAllocatedRoot);
  DCHECK_LE(higher_limit, StaticReadOnlyRoot::kLastAllocatedRoot);
  AssertNotSmi(heap_object);
  CompareRange(heap_object, lower_limit, higher_limit);
  Assert(kUnsignedLessThanEqual, reason);
}
#endif
 
inline void MaglevAssembler::CompareMapWithRoot(Register object,
                                                RootIndex index,
                                                Register scratch) {
  if (CanBeImmediate(index)) {
    cmp_tagged(FieldOperand(object, HeapObject::kMapOffset),
               Immediate(static_cast<uint32_t>(ReadOnlyRootPtr(index))));
    return;
  }
  LoadMap(scratch, object);
  CompareRoot(scratch, index);
}
 
inline void MaglevAssembler::CompareInstanceType(Register map,
                                                 InstanceType instance_type) {
  CmpInstanceType(map, instance_type);
}
 
inline Condition MaglevAssembler::CompareInstanceTypeRange(
    Register map, Register instance_type_out, InstanceType lower_limit,
    InstanceType higher_limit) {
  CmpInstanceTypeRange(map, instance_type_out, lower_limit, higher_limit);
  return kUnsignedLessThanEqual;
}
 
inline void MaglevAssembler::CompareFloat64AndJumpIf(
    DoubleRegister src1, DoubleRegister src2, Condition cond, Label* target,
    Label* nan_failed, Label::Distance distance) {
  Ucomisd(src1, src2);
  // Ucomisd sets these flags accordingly:
  //   UNORDERED(one of the operands is a NaN): ZF,PF,CF := 111;
  //   GREATER_THAN: ZF,PF,CF := 000;
  //   LESS_THAN: ZF,PF,CF := 001;
  //   EQUAL: ZF,PF,CF := 100;
  // Since ZF can be set by NaN or EQUAL, we check for NaN first.
  JumpIf(ConditionForNaN(), nan_failed);
  JumpIf(cond, target, distance);
}
 
inline void MaglevAssembler::CompareFloat64AndBranch(
    DoubleRegister src1, DoubleRegister src2, Condition cond,
    BasicBlock* if_true, BasicBlock* if_false, BasicBlock* next_block,
    BasicBlock* nan_failed) {
  Ucomisd(src1, src2);
  JumpIf(ConditionForNaN(), nan_failed->label());
  Branch(cond, if_true, if_false, next_block);
}
 
inline void MaglevAssembler::PrepareCallCFunction(int num_reg_arguments,
                                                  int num_double_registers) {
  MacroAssembler::PrepareCallCFunction(num_reg_arguments +
                                       num_double_registers);
}
 
inline void MaglevAssembler::CallSelf() {
  DCHECK(allow_call());
  DCHECK(code_gen_state()->entry_label()->is_bound());
  Call(code_gen_state()->entry_label());
}
 
inline void MaglevAssembler::Jump(Label* target, Label::Distance distance) {
  // Any eager deopts should go through JumpIf to enable us to support the
  // `--deopt-every-n-times` stress mode. See EmitEagerDeoptStress.
  DCHECK(!IsDeoptLabel(target));
  jmp(target, distance);
}
 
inline void MaglevAssembler::JumpToDeopt(Label* target) {
  DCHECK(IsDeoptLabel(target));
  jmp(target);
}
 
inline void MaglevAssembler::EmitEagerDeoptStress(Label* target) {
  if (V8_LIKELY(v8_flags.deopt_every_n_times <= 0)) {
    return;
  }
 
  ExternalReference counter = ExternalReference::stress_deopt_count(isolate());
  // The following code assumes that `Isolate::stress_deopt_count_` is 8 bytes
  // wide.
  static constexpr size_t kSizeofRAX = 8;
  static_assert(sizeof(decltype(*isolate()->stress_deopt_count_address())) ==
                kSizeofRAX);
 
  Label fallthrough;
  pushfq();
  pushq(rax);
  load_rax(counter);
  decl(rax);
  JumpIf(not_zero, &fallthrough, Label::kNear);
 
  RecordComment("-- deopt_every_n_times hit, jump to eager deopt");
  Move(rax, v8_flags.deopt_every_n_times);
  store_rax(counter);
  popq(rax);
  popfq();
  JumpToDeopt(target);
 
  bind(&fallthrough);
  store_rax(counter);
  popq(rax);
  popfq();
}
 
inline void MaglevAssembler::JumpIf(Condition cond, Label* target,
                                    Label::Distance distance) {
  // The least common denominator of all eager deopts is that they eventually
  // (should) bottom out in `JumpIf`. We use the opportunity here to trigger
  // extra eager deoptimizations with the `--deopt-every-n-times` stress mode.
  // Since `IsDeoptLabel` is slow we duplicate the test for the flag here.
  if (V8_UNLIKELY(v8_flags.deopt_every_n_times > 0)) {
    if (IsDeoptLabel(target)) {
      EmitEagerDeoptStress(target);
    }
  }
  DCHECK_IMPLIES(IsDeoptLabel(target), distance == Label::kFar);
  j(cond, target, distance);
}
 
inline void MaglevAssembler::JumpIfRoot(Register with, RootIndex index,
                                        Label* if_equal,
                                        Label::Distance distance) {
  MacroAssembler::JumpIfRoot(with, index, if_equal, distance);
}
 
inline void MaglevAssembler::JumpIfNotRoot(Register with, RootIndex index,
                                           Label* if_not_equal,
                                           Label::Distance distance) {
  MacroAssembler::JumpIfNotRoot(with, index, if_not_equal, distance);
}
 
inline void MaglevAssembler::JumpIfSmi(Register src, Label* on_smi,
                                       Label::Distance distance) {
  MacroAssembler::JumpIfSmi(src, on_smi, distance);
}
 
inline void MaglevAssembler::JumpIfNotSmi(Register src, Label* on_not_smi,
                                          Label::Distance distance) {
  MacroAssembler::JumpIfNotSmi(src, on_not_smi, distance);
}
 
void MaglevAssembler::JumpIfByte(Condition cc, Register value, int32_t byte,
                                 Label* target, Label::Distance distance) {
  cmpb(value, Immediate(byte));
  j(cc, target, distance);
}
 
void MaglevAssembler::JumpIfHoleNan(DoubleRegister value, Register scratch,
                                    Label* target, Label::Distance distance) {
  // TODO(leszeks): Right now this only accepts Zone-allocated target labels.
  // This works because all callsites are jumping to either a deopt, deferred
  // code, or a basic block. If we ever need to jump to an on-stack label, we
  // have to add support for it here change the caller to pass a ZoneLabelRef.
  DCHECK(compilation_info()->zone()->Contains(target));
  ZoneLabelRef is_hole = ZoneLabelRef::UnsafeFromLabelPointer(target);
  ZoneLabelRef is_not_hole(this);
  Ucomisd(value, value);
  JumpIf(ConditionForNaN(),
         MakeDeferredCode(
             [](MaglevAssembler* masm, DoubleRegister value, Register scratch,
                ZoneLabelRef is_hole, ZoneLabelRef is_not_hole) {
               masm->Pextrd(scratch, value, 1);
               masm->CompareInt32AndJumpIf(scratch, kHoleNanUpper32, kEqual,
                                           *is_hole);
               masm->Jump(*is_not_hole);
             },
             value, scratch, is_hole, is_not_hole));
  bind(*is_not_hole);
}
 
void MaglevAssembler::JumpIfNotHoleNan(DoubleRegister value, Register scratch,
                                       Label* target,
                                       Label::Distance distance) {
  JumpIfNotNan(value, target, distance);
  Pextrd(scratch, value, 1);
  CompareInt32AndJumpIf(scratch, kHoleNanUpper32, kNotEqual, target, distance);
}
 
void MaglevAssembler::JumpIfNotHoleNan(MemOperand operand, Label* target,
                                       Label::Distance distance) {
  movl(kScratchRegister, MemOperand(operand, kDoubleSize / 2));
  CompareInt32AndJumpIf(kScratchRegister, kHoleNanUpper32, kNotEqual, target,
                        distance);
}
 
void MaglevAssembler::JumpIfNan(DoubleRegister value, Label* target,
                                Label::Distance distance) {
  Ucomisd(value, value);
  JumpIf(ConditionForNaN(), target, distance);
}
 
void MaglevAssembler::JumpIfNotNan(DoubleRegister value, Label* target,
                                   Label::Distance distance) {
  Ucomisd(value, value);
  JumpIf(NegateCondition(ConditionForNaN()), target, distance);
}
 
void MaglevAssembler::CompareInt32AndJumpIf(Register r1, Register r2,
                                            Condition cond, Label* target,
                                            Label::Distance distance) {
  cmpl(r1, r2);
  JumpIf(cond, target, distance);
}
 
void MaglevAssembler::CompareIntPtrAndJumpIf(Register r1, Register r2,
                                             Condition cond, Label* target,
                                             Label::Distance distance) {
  cmpq(r1, r2);
  JumpIf(cond, target, distance);
}
 
inline void MaglevAssembler::CompareInt32AndJumpIf(Register r1, int32_t value,
                                                   Condition cond,
                                                   Label* target,
                                                   Label::Distance distance) {
  Cmp(r1, value);
  JumpIf(cond, target, distance);
}
 
void MaglevAssembler::CompareIntPtrAndJumpIf(Register r1, int32_t value,
                                             Condition cond, Label* target,
                                             Label::Distance distance) {
  cmpq(r1, Immediate(value));
  JumpIf(cond, target, distance);
}
 
inline void MaglevAssembler::CompareInt32AndBranch(
    Register r1, int32_t value, Condition cond, Label* if_true,
    Label::Distance true_distance, bool fallthrough_when_true, Label* if_false,
    Label::Distance false_distance, bool fallthrough_when_false) {
  Cmp(r1, value);
  Branch(cond, if_true, true_distance, fallthrough_when_true, if_false,
         false_distance, fallthrough_when_false);
}
 
inline void MaglevAssembler::CompareInt32AndBranch(
    Register r1, Register r2, Condition cond, Label* if_true,
    Label::Distance true_distance, bool fallthrough_when_true, Label* if_false,
    Label::Distance false_distance, bool fallthrough_when_false) {
  cmpl(r1, r2);
  Branch(cond, if_true, true_distance, fallthrough_when_true, if_false,
         false_distance, fallthrough_when_false);
}
 
inline void MaglevAssembler::CompareIntPtrAndBranch(
    Register r1, int32_t value, Condition cond, Label* if_true,
    Label::Distance true_distance, bool fallthrough_when_true, Label* if_false,
    Label::Distance false_distance, bool fallthrough_when_false) {
  cmpq(r1, Immediate(value));
  Branch(cond, if_true, true_distance, fallthrough_when_true, if_false,
         false_distance, fallthrough_when_false);
}
 
inline void MaglevAssembler::CompareInt32AndAssert(Register r1, Register r2,
                                                   Condition cond,
                                                   AbortReason reason) {
  cmpl(r1, r2);
  Assert(cond, reason);
}
inline void MaglevAssembler::CompareInt32AndAssert(Register r1, int32_t value,
                                                   Condition cond,
                                                   AbortReason reason) {
  Cmp(r1, value);
  Assert(cond, reason);
}
 
inline void MaglevAssembler::CompareSmiAndJumpIf(Register r1, Tagged<Smi> value,
                                                 Condition cond, Label* target,
                                                 Label::Distance distance) {
  AssertSmi(r1);
  Cmp(r1, value);
  JumpIf(cond, target, distance);
}
 
inline void MaglevAssembler::CompareSmiAndAssert(Register r1, Tagged<Smi> value,
                                                 Condition cond,
                                                 AbortReason reason) {
  if (!v8_flags.debug_code) return;
  AssertSmi(r1);
  Cmp(r1, value);
  Assert(cond, reason);
}
 
inline void MaglevAssembler::CompareByteAndJumpIf(MemOperand left, int8_t right,
                                                  Condition cond,
                                                  Register scratch,
                                                  Label* target,
                                                  Label::Distance distance) {
  cmpb(left, Immediate(right));
  JumpIf(cond, target, distance);
}
 
inline void MaglevAssembler::CompareTaggedAndJumpIf(Register r1,
                                                    Tagged<Smi> value,
                                                    Condition cond,
                                                    Label* target,
                                                    Label::Distance distance) {
  Cmp(r1, value);
  JumpIf(cond, target, distance);
}
 
inline void MaglevAssembler::CompareTaggedAndJumpIf(Register r1,
                                                    Handle<HeapObject> obj,
                                                    Condition cond,
                                                    Label* target,
                                                    Label::Distance distance) {
  Cmp(r1, obj);
  JumpIf(cond, target, distance);
}
 
inline void MaglevAssembler::CompareTaggedAndJumpIf(Register src1,
                                                    Register src2,
                                                    Condition cond,
                                                    Label* target,
                                                    Label::Distance distance) {
  cmp_tagged(src1, src2);
  JumpIf(cond, target, distance);
}
 
inline void MaglevAssembler::CompareDoubleAndJumpIfZeroOrNaN(
    DoubleRegister reg, Label* target, Label::Distance distance) {
  // Sets scratch register to 0.0.
  Xorpd(kScratchDoubleReg, kScratchDoubleReg);
  // Sets ZF if equal to 0.0, -0.0 or NaN.
  Ucomisd(kScratchDoubleReg, reg);
  JumpIf(kZero, target, distance);
}
 
inline void MaglevAssembler::CompareDoubleAndJumpIfZeroOrNaN(
    MemOperand operand, Label* target, Label::Distance distance) {
  // Sets scratch register to 0.0.
  Xorpd(kScratchDoubleReg, kScratchDoubleReg);
  // Sets ZF if equal to 0.0, -0.0 or NaN.
  Ucomisd(kScratchDoubleReg, operand);
  JumpIf(kZero, target, distance);
}
 
inline void MaglevAssembler::TestInt32AndJumpIfAnySet(
    Register r1, int32_t mask, Label* target, Label::Distance distance) {
  testl(r1, Immediate(mask));
  JumpIf(kNotZero, target, distance);
}
 
inline void MaglevAssembler::TestInt32AndJumpIfAnySet(
    MemOperand operand, int32_t mask, Label* target, Label::Distance distance) {
  testl(operand, Immediate(mask));
  JumpIf(kNotZero, target, distance);
}
 
inline void MaglevAssembler::TestUint8AndJumpIfAnySet(
    MemOperand operand, uint8_t mask, Label* target, Label::Distance distance) {
  testb(operand, Immediate(mask));
  JumpIf(kNotZero, target, distance);
}
 
inline void MaglevAssembler::TestInt32AndJumpIfAllClear(
    Register r1, int32_t mask, Label* target, Label::Distance distance) {
  testl(r1, Immediate(mask));
  JumpIf(kZero, target, distance);
}
 
inline void MaglevAssembler::TestInt32AndJumpIfAllClear(
    MemOperand operand, int32_t mask, Label* target, Label::Distance distance) {
  testl(operand, Immediate(mask));
  JumpIf(kZero, target, distance);
}
 
inline void MaglevAssembler::TestUint8AndJumpIfAllClear(
    MemOperand operand, uint8_t mask, Label* target, Label::Distance distance) {
  testb(operand, Immediate(mask));
  JumpIf(kZero, target, distance);
}
 
inline void MaglevAssembler::LoadHeapNumberValue(DoubleRegister result,
                                                 Register heap_number) {
  Movsd(result, FieldOperand(heap_number, offsetof(HeapNumber, value_)));
}
 
inline void MaglevAssembler::LoadHeapInt32Value(Register result,
                                                Register heap_number) {
  movl(result, FieldOperand(heap_number, offsetof(HeapNumber, value_)));
}
 
inline void MaglevAssembler::StoreHeapInt32Value(Register value,
                                                 Register heap_number) {
  movl(FieldOperand(heap_number, offsetof(HeapNumber, value_)), value);
}
 
inline void MaglevAssembler::Int32ToDouble(DoubleRegister result,
                                           Register src) {
  Cvtlsi2sd(result, src);
}
 
inline void MaglevAssembler::Uint32ToDouble(DoubleRegister result,
                                            Register src) {
  // TODO(leszeks): Cvtlui2sd does a manual movl to clear the top bits of the
  // input register. We could eliminate this movl by ensuring that word32
  // registers are always written with 32-bit ops and not 64-bit ones.
  Cvtlui2sd(result, src);
}
 
inline void MaglevAssembler::IntPtrToDouble(DoubleRegister result,
                                            Register src) {
  Cvtqsi2sd(result, src);
}
 
inline void MaglevAssembler::Pop(Register dst) { MacroAssembler::Pop(dst); }
 
template <typename NodeT>
inline void MaglevAssembler::EmitEagerDeoptIfNotEqual(DeoptimizeReason reason,
                                                      NodeT* node) {
  EmitEagerDeoptIf(not_equal, reason, node);
}
 
inline void MaglevAssembler::AssertStackSizeCorrect() {
  if (v8_flags.slow_debug_code) {
    movq(kScratchRegister, rbp);
    subq(kScratchRegister, rsp);
    cmpq(kScratchRegister,
         Immediate(code_gen_state()->stack_slots() * kSystemPointerSize +
                   StandardFrameConstants::kFixedFrameSizeFromFp));
    Assert(equal, AbortReason::kStackAccessBelowStackPointer);
  }
}
 
inline Condition MaglevAssembler::FunctionEntryStackCheck(
    int stack_check_offset) {
  Register stack_cmp_reg = rsp;
  if (stack_check_offset >= kStackLimitSlackForDeoptimizationInBytes) {
    stack_cmp_reg = kScratchRegister;
    leaq(stack_cmp_reg, Operand(rsp, -stack_check_offset));
  }
  cmpq(stack_cmp_reg,
       StackLimitAsOperand(StackLimitKind::kInterruptStackLimit));
  return kUnsignedGreaterThanEqual;
}
 
inline void MaglevAssembler::FinishCode() {}
 
template <typename Dest, typename Source>
inline void MaglevAssembler::MoveRepr(MachineRepresentation repr, Dest dst,
                                      Source src) {
  switch (repr) {
    case MachineRepresentation::kWord32:
      return movl(dst, src);
    case MachineRepresentation::kTagged:
    case MachineRepresentation::kTaggedPointer:
    case MachineRepresentation::kTaggedSigned:
    case MachineRepresentation::kWord64:
      return movq(dst, src);
    default:
      UNREACHABLE();
  }
}
template <>
inline void MaglevAssembler::MoveRepr(MachineRepresentation repr,
                                      MemOperand dst, MemOperand src) {
  MoveRepr(repr, kScratchRegister, src);
  MoveRepr(repr, dst, kScratchRegister);
}
 
inline void MaglevAssembler::MaybeEmitPlaceHolderForDeopt() {
  if (v8_flags.cet_compatible) {
    Nop(Assembler::kIntraSegmentJmpInstrSize);
  }
}
 
}  // namespace maglev
}  // namespace internal
}  // namespace v8
 
#endif  // V8_MAGLEV_X64_MAGLEV_ASSEMBLER_X64_INL_H_