// Copyright 2017 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_WASM_BASELINE_X64_LIFTOFF_ASSEMBLER_X64_H_
#define V8_WASM_BASELINE_X64_LIFTOFF_ASSEMBLER_X64_H_

#include "src/codegen/assembler.h"
#include "src/heap/memory-chunk.h"
#include "src/wasm/baseline/liftoff-assembler.h"
#include "src/wasm/simd-shuffle.h"

namespace v8 {
namespace internal {
namespace wasm {

#define RETURN_FALSE_IF_MISSING_CPU_FEATURE(name)    \
  if (!CpuFeatures::IsSupported(name)) return false; \
  CpuFeatureScope feature(this, name);

namespace liftoff {

constexpr Register kScratchRegister2 = r11;
static_assert(kScratchRegister != kScratchRegister2, "collision");
static_assert((kLiftoffAssemblerGpCacheRegs &
               Register::ListOf(kScratchRegister, kScratchRegister2)) == 0,
              "scratch registers must not be used as cache registers");

constexpr DoubleRegister kScratchDoubleReg2 = xmm14;
static_assert(kScratchDoubleReg != kScratchDoubleReg2, "collision");
static_assert((kLiftoffAssemblerFpCacheRegs &
               DoubleRegister::ListOf(kScratchDoubleReg, kScratchDoubleReg2)) ==
                  0,
              "scratch registers must not be used as cache registers");

// rbp-8 holds the stack marker, rbp-16 is the instance parameter.
constexpr int kInstanceOffset = 16;

inline Operand GetStackSlot(int offset) { return Operand(rbp, -offset); }

// TODO(clemensb): Make this a constexpr variable once Operand is constexpr.
inline Operand GetInstanceOperand() { return GetStackSlot(kInstanceOffset); }

inline Operand GetMemOp(LiftoffAssembler* assm, Register addr, Register offset,
                        uint32_t offset_imm) {
  if (is_uint31(offset_imm)) {
    if (offset == no_reg) return Operand(addr, offset_imm);
    return Operand(addr, offset, times_1, offset_imm);
  }
  // Offset immediate does not fit in 31 bits.
  Register scratch = kScratchRegister;
  assm->movl(scratch, Immediate(offset_imm));
  if (offset != no_reg) {
    assm->addq(scratch, offset);
  }
  return Operand(addr, scratch, times_1, 0);
}

inline void Load(LiftoffAssembler* assm, LiftoffRegister dst, Operand src,
                 ValueType type) {
  switch (type.kind()) {
    case ValueType::kI32:
      assm->movl(dst.gp(), src);
      break;
    case ValueType::kI64:
    case ValueType::kOptRef:
    case ValueType::kRef:
      assm->movq(dst.gp(), src);
      break;
    case ValueType::kF32:
      assm->Movss(dst.fp(), src);
      break;
    case ValueType::kF64:
      assm->Movsd(dst.fp(), src);
      break;
    case ValueType::kS128:
      assm->Movdqu(dst.fp(), src);
      break;
    default:
      UNREACHABLE();
  }
}

inline void Store(LiftoffAssembler* assm, Operand dst, LiftoffRegister src,
                  ValueType type) {
  switch (type.kind()) {
    case ValueType::kI32:
      assm->movl(dst, src.gp());
      break;
    case ValueType::kI64:
      assm->movq(dst, src.gp());
      break;
    case ValueType::kF32:
      assm->Movss(dst, src.fp());
      break;
    case ValueType::kF64:
      assm->Movsd(dst, src.fp());
      break;
    case ValueType::kS128:
      assm->Movdqu(dst, src.fp());
      break;
    default:
      UNREACHABLE();
  }
}

inline void push(LiftoffAssembler* assm, LiftoffRegister reg, ValueType type) {
  switch (type.kind()) {
    case ValueType::kI32:
    case ValueType::kI64:
      assm->pushq(reg.gp());
      break;
    case ValueType::kF32:
      assm->AllocateStackSpace(kSystemPointerSize);
      assm->Movss(Operand(rsp, 0), reg.fp());
      break;
    case ValueType::kF64:
      assm->AllocateStackSpace(kSystemPointerSize);
      assm->Movsd(Operand(rsp, 0), reg.fp());
      break;
    case ValueType::kS128:
      assm->AllocateStackSpace(kSystemPointerSize * 2);
      assm->Movdqu(Operand(rsp, 0), reg.fp());
      break;
    default:
      UNREACHABLE();
  }
}

constexpr int kSubSpSize = 7;  // 7 bytes for "subq rsp, <imm32>"

}  // namespace liftoff

int LiftoffAssembler::PrepareStackFrame() {
  int offset = pc_offset();
  sub_sp_32(0);
  DCHECK_EQ(liftoff::kSubSpSize, pc_offset() - offset);
  return offset;
}

void LiftoffAssembler::PrepareTailCall(int num_callee_stack_params,
                                       int stack_param_delta) {
  // Push the return address and frame pointer to complete the stack frame.
  pushq(Operand(rbp, 8));
  pushq(Operand(rbp, 0));

  // Shift the whole frame upwards.
  const int slot_count = num_callee_stack_params + 2;
  for (int i = slot_count - 1; i >= 0; --i) {
    movq(kScratchRegister, Operand(rsp, i * 8));
    movq(Operand(rbp, (i - stack_param_delta) * 8), kScratchRegister);
  }

  // Set the new stack and frame pointer.
  leaq(rsp, Operand(rbp, -stack_param_delta * 8));
  popq(rbp);
}

void LiftoffAssembler::PatchPrepareStackFrame(int offset, int frame_size) {
  // Need to align sp to system pointer size.
  frame_size = RoundUp(frame_size, kSystemPointerSize);
  // We can't run out of space, just pass anything big enough to not cause the
  // assembler to try to grow the buffer.
  constexpr int kAvailableSpace = 64;
  Assembler patching_assembler(
      AssemblerOptions{},
      ExternalAssemblerBuffer(buffer_start_ + offset, kAvailableSpace));
#ifdef V8_TARGET_OS_WIN
  if (frame_size > kStackPageSize) {
    // Generate OOL code (at the end of the function, where the current
    // assembler is pointing) to do the explicit stack limit check (see
    // https://docs.microsoft.com/en-us/previous-versions/visualstudio/visual-studio-6.0/aa227153(v=vs.60)).
    // At the function start, emit a jump to that OOL code (from {offset} to
    // {pc_offset()}).
    int ool_offset = pc_offset() - offset;
    patching_assembler.jmp_rel(ool_offset);
    DCHECK_GE(liftoff::kSubSpSize, patching_assembler.pc_offset());
    patching_assembler.Nop(liftoff::kSubSpSize -
                           patching_assembler.pc_offset());

    // Now generate the OOL code.
    AllocateStackSpace(frame_size);
    // Jump back to the start of the function (from {pc_offset()} to {offset +
    // kSubSpSize}).
    int func_start_offset = offset + liftoff::kSubSpSize - pc_offset();
    jmp_rel(func_start_offset);
    return;
  }
#endif
  patching_assembler.sub_sp_32(frame_size);
  DCHECK_EQ(liftoff::kSubSpSize, patching_assembler.pc_offset());
}

void LiftoffAssembler::FinishCode() {}

void LiftoffAssembler::AbortCompilation() {}

// static
constexpr int LiftoffAssembler::StaticStackFrameSize() {
  return liftoff::kInstanceOffset;
}

int LiftoffAssembler::SlotSizeForType(ValueType type) {
  return type.element_size_bytes();
}

bool LiftoffAssembler::NeedsAlignment(ValueType type) {
  return type.is_reference_type();
}

void LiftoffAssembler::LoadConstant(LiftoffRegister reg, WasmValue value,
                                    RelocInfo::Mode rmode) {
  switch (value.type().kind()) {
    case ValueType::kI32:
      if (value.to_i32() == 0 && RelocInfo::IsNone(rmode)) {
        xorl(reg.gp(), reg.gp());
      } else {
        movl(reg.gp(), Immediate(value.to_i32(), rmode));
      }
      break;
    case ValueType::kI64:
      if (RelocInfo::IsNone(rmode)) {
        TurboAssembler::Set(reg.gp(), value.to_i64());
      } else {
        movq(reg.gp(), Immediate64(value.to_i64(), rmode));
      }
      break;
    case ValueType::kF32:
      TurboAssembler::Move(reg.fp(), value.to_f32_boxed().get_bits());
      break;
    case ValueType::kF64:
      TurboAssembler::Move(reg.fp(), value.to_f64_boxed().get_bits());
      break;
    default:
      UNREACHABLE();
  }
}

void LiftoffAssembler::LoadFromInstance(Register dst, int offset, int size) {
  DCHECK_LE(0, offset);
  DCHECK(size == 4 || size == 8);
  movq(dst, liftoff::GetInstanceOperand());
  if (size == 4) {
    movl(dst, Operand(dst, offset));
  } else {
    movq(dst, Operand(dst, offset));
  }
}

void LiftoffAssembler::LoadTaggedPointerFromInstance(Register dst, int offset) {
  DCHECK_LE(0, offset);
  movq(dst, liftoff::GetInstanceOperand());
  LoadTaggedPointerField(dst, Operand(dst, offset));
}

void LiftoffAssembler::SpillInstance(Register instance) {
  movq(liftoff::GetInstanceOperand(), instance);
}

void LiftoffAssembler::FillInstanceInto(Register dst) {
  movq(dst, liftoff::GetInstanceOperand());
}

void LiftoffAssembler::LoadTaggedPointer(Register dst, Register src_addr,
                                         Register offset_reg,
                                         int32_t offset_imm,
                                         LiftoffRegList pinned) {
  DCHECK_GE(offset_imm, 0);
  if (emit_debug_code() && offset_reg != no_reg) {
    AssertZeroExtended(offset_reg);
  }
  Operand src_op = liftoff::GetMemOp(this, src_addr, offset_reg,
                                     static_cast<uint32_t>(offset_imm));
  LoadTaggedPointerField(dst, src_op);
}

void LiftoffAssembler::StoreTaggedPointer(Register dst_addr,
                                          int32_t offset_imm,
                                          LiftoffRegister src,
                                          LiftoffRegList pinned) {
  DCHECK_GE(offset_imm, 0);
  Register scratch = pinned.set(GetUnusedRegister(kGpReg, pinned)).gp();
  Operand dst_op = liftoff::GetMemOp(this, dst_addr, no_reg,
                                     static_cast<uint32_t>(offset_imm));
  StoreTaggedField(dst_op, src.gp());

  Label write_barrier;
  Label exit;
  CheckPageFlag(dst_addr, scratch,
                MemoryChunk::kPointersFromHereAreInterestingMask, not_zero,
                &write_barrier, Label::kNear);
  jmp(&exit, Label::kNear);
  bind(&write_barrier);
  JumpIfSmi(src.gp(), &exit, Label::kNear);
  if (COMPRESS_POINTERS_BOOL) {
    DecompressTaggedPointer(src.gp(), src.gp());
  }
  CheckPageFlag(src.gp(), scratch,
                MemoryChunk::kPointersToHereAreInterestingMask, zero, &exit,
                Label::kNear);
  leaq(scratch, dst_op);
  CallRecordWriteStub(dst_addr, scratch, EMIT_REMEMBERED_SET, kSaveFPRegs,
                      wasm::WasmCode::kRecordWrite);
  bind(&exit);
}

void LiftoffAssembler::AtomicLoad(LiftoffRegister dst, Register src_addr,
                                  Register offset_reg, uint32_t offset_imm,
                                  LoadType type, LiftoffRegList pinned) {
  Load(dst, src_addr, offset_reg, offset_imm, type, pinned, nullptr, true);
}

void LiftoffAssembler::Load(LiftoffRegister dst, Register src_addr,
                            Register offset_reg, uint32_t offset_imm,
                            LoadType type, LiftoffRegList pinned,
                            uint32_t* protected_load_pc, bool is_load_mem) {
  if (emit_debug_code() && offset_reg != no_reg) {
    AssertZeroExtended(offset_reg);
  }
  Operand src_op = liftoff::GetMemOp(this, src_addr, offset_reg, offset_imm);
  if (protected_load_pc) *protected_load_pc = pc_offset();
  switch (type.value()) {
    case LoadType::kI32Load8U:
    case LoadType::kI64Load8U:
      movzxbl(dst.gp(), src_op);
      break;
    case LoadType::kI32Load8S:
      movsxbl(dst.gp(), src_op);
      break;
    case LoadType::kI64Load8S:
      movsxbq(dst.gp(), src_op);
      break;
    case LoadType::kI32Load16U:
    case LoadType::kI64Load16U:
      movzxwl(dst.gp(), src_op);
      break;
    case LoadType::kI32Load16S:
      movsxwl(dst.gp(), src_op);
      break;
    case LoadType::kI64Load16S:
      movsxwq(dst.gp(), src_op);
      break;
    case LoadType::kI32Load:
    case LoadType::kI64Load32U:
      movl(dst.gp(), src_op);
      break;
    case LoadType::kI64Load32S:
      movsxlq(dst.gp(), src_op);
      break;
    case LoadType::kI64Load:
      movq(dst.gp(), src_op);
      break;
    case LoadType::kF32Load:
      Movss(dst.fp(), src_op);
      break;
    case LoadType::kF64Load:
      Movsd(dst.fp(), src_op);
      break;
    case LoadType::kS128Load:
      Movdqu(dst.fp(), src_op);
      break;
  }
}

void LiftoffAssembler::Store(Register dst_addr, Register offset_reg,
                             uint32_t offset_imm, LiftoffRegister src,
                             StoreType type, LiftoffRegList /* pinned */,
                             uint32_t* protected_store_pc, bool is_store_mem) {
  if (emit_debug_code() && offset_reg != no_reg) {
    AssertZeroExtended(offset_reg);
  }
  Operand dst_op = liftoff::GetMemOp(this, dst_addr, offset_reg, offset_imm);
  if (protected_store_pc) *protected_store_pc = pc_offset();
  switch (type.value()) {
    case StoreType::kI32Store8:
    case StoreType::kI64Store8:
      movb(dst_op, src.gp());
      break;
    case StoreType::kI32Store16:
    case StoreType::kI64Store16:
      movw(dst_op, src.gp());
      break;
    case StoreType::kI32Store:
    case StoreType::kI64Store32:
      movl(dst_op, src.gp());
      break;
    case StoreType::kI64Store:
      movq(dst_op, src.gp());
      break;
    case StoreType::kF32Store:
      Movss(dst_op, src.fp());
      break;
    case StoreType::kF64Store:
      Movsd(dst_op, src.fp());
      break;
    case StoreType::kS128Store:
      Movdqu(dst_op, src.fp());
      break;
  }
}

void LiftoffAssembler::AtomicStore(Register dst_addr, Register offset_reg,
                                   uint32_t offset_imm, LiftoffRegister src,
                                   StoreType type, LiftoffRegList pinned) {
  if (emit_debug_code() && offset_reg != no_reg) {
    AssertZeroExtended(offset_reg);
  }
  Operand dst_op = liftoff::GetMemOp(this, dst_addr, offset_reg, offset_imm);
  Register src_reg = src.gp();
  if (cache_state()->is_used(src)) {
    movq(kScratchRegister, src_reg);
    src_reg = kScratchRegister;
  }
  switch (type.value()) {
    case StoreType::kI32Store8:
    case StoreType::kI64Store8:
      xchgb(src_reg, dst_op);
      break;
    case StoreType::kI32Store16:
    case StoreType::kI64Store16:
      xchgw(src_reg, dst_op);
      break;
    case StoreType::kI32Store:
    case StoreType::kI64Store32:
      xchgl(src_reg, dst_op);
      break;
    case StoreType::kI64Store:
      xchgq(src_reg, dst_op);
      break;
    default:
      UNREACHABLE();
  }
}

void LiftoffAssembler::AtomicAdd(Register dst_addr, Register offset_reg,
                                 uint32_t offset_imm, LiftoffRegister value,
                                 LiftoffRegister result, StoreType type) {
  DCHECK(!cache_state()->is_used(result));
  if (cache_state()->is_used(value)) {
    // We cannot overwrite {value}, but the {value} register is changed in the
    // code we generate. Therefore we copy {value} to {result} and use the
    // {result} register in the code below.
    movq(result.gp(), value.gp());
    value = result;
  }
  if (emit_debug_code() && offset_reg != no_reg) {
    AssertZeroExtended(offset_reg);
  }
  Operand dst_op = liftoff::GetMemOp(this, dst_addr, offset_reg, offset_imm);
  lock();
  switch (type.value()) {
    case StoreType::kI32Store8:
    case StoreType::kI64Store8:
      xaddb(dst_op, value.gp());
      movzxbq(result.gp(), value.gp());
      break;
    case StoreType::kI32Store16:
    case StoreType::kI64Store16:
      xaddw(dst_op, value.gp());
      movzxwq(result.gp(), value.gp());
      break;
    case StoreType::kI32Store:
    case StoreType::kI64Store32:
      xaddl(dst_op, value.gp());
      if (value != result) {
        movq(result.gp(), value.gp());
      }
      break;
    case StoreType::kI64Store:
      xaddq(dst_op, value.gp());
      if (value != result) {
        movq(result.gp(), value.gp());
      }
      break;
    default:
      UNREACHABLE();
  }
}

void LiftoffAssembler::AtomicSub(Register dst_addr, Register offset_reg,
                                 uint32_t offset_imm, LiftoffRegister value,
                                 LiftoffRegister result, StoreType type) {
  DCHECK(!cache_state()->is_used(result));
  if (cache_state()->is_used(value)) {
    // We cannot overwrite {value}, but the {value} register is changed in the
    // code we generate. Therefore we copy {value} to {result} and use the
    // {result} register in the code below.
    movq(result.gp(), value.gp());
    value = result;
  }
  if (emit_debug_code() && offset_reg != no_reg) {
    AssertZeroExtended(offset_reg);
  }
  Operand dst_op = liftoff::GetMemOp(this, dst_addr, offset_reg, offset_imm);
  switch (type.value()) {
    case StoreType::kI32Store8:
    case StoreType::kI64Store8:
      negb(value.gp());
      lock();
      xaddb(dst_op, value.gp());
      movzxbq(result.gp(), value.gp());
      break;
    case StoreType::kI32Store16:
    case StoreType::kI64Store16:
      negw(value.gp());
      lock();
      xaddw(dst_op, value.gp());
      movzxwq(result.gp(), value.gp());
      break;
    case StoreType::kI32Store:
    case StoreType::kI64Store32:
      negl(value.gp());
      lock();
      xaddl(dst_op, value.gp());
      if (value != result) {
        movq(result.gp(), value.gp());
      }
      break;
    case StoreType::kI64Store:
      negq(value.gp());
      lock();
      xaddq(dst_op, value.gp());
      if (value != result) {
        movq(result.gp(), value.gp());
      }
      break;
    default:
      UNREACHABLE();
  }
}

namespace liftoff {
#define __ lasm->

inline void AtomicBinop(LiftoffAssembler* lasm,
                        void (Assembler::*opl)(Register, Register),
                        void (Assembler::*opq)(Register, Register),
                        Register dst_addr, Register offset_reg,
                        uint32_t offset_imm, LiftoffRegister value,
                        LiftoffRegister result, StoreType type) {
  DCHECK(!__ cache_state()->is_used(result));
  Register value_reg = value.gp();
  // The cmpxchg instruction uses rax to store the old value of the
  // compare-exchange primitive. Therefore we have to spill the register and
  // move any use to another register.
  LiftoffRegList pinned =
      LiftoffRegList::ForRegs(dst_addr, offset_reg, value_reg);
  __ ClearRegister(rax, {&dst_addr, &offset_reg, &value_reg}, pinned);
  if (__ emit_debug_code() && offset_reg != no_reg) {
    __ AssertZeroExtended(offset_reg);
  }
  Operand dst_op = liftoff::GetMemOp(lasm, dst_addr, offset_reg, offset_imm);

  switch (type.value()) {
    case StoreType::kI32Store8:
    case StoreType::kI64Store8: {
      Label binop;
      __ xorq(rax, rax);
      __ movb(rax, dst_op);
      __ bind(&binop);
      __ movl(kScratchRegister, rax);
      (lasm->*opl)(kScratchRegister, value_reg);
      __ lock();
      __ cmpxchgb(dst_op, kScratchRegister);
      __ j(not_equal, &binop);
      break;
    }
    case StoreType::kI32Store16:
    case StoreType::kI64Store16: {
      Label binop;
      __ xorq(rax, rax);
      __ movw(rax, dst_op);
      __ bind(&binop);
      __ movl(kScratchRegister, rax);
      (lasm->*opl)(kScratchRegister, value_reg);
      __ lock();
      __ cmpxchgw(dst_op, kScratchRegister);
      __ j(not_equal, &binop);
      break;
    }
    case StoreType::kI32Store:
    case StoreType::kI64Store32: {
      Label binop;
      __ movl(rax, dst_op);
      __ bind(&binop);
      __ movl(kScratchRegister, rax);
      (lasm->*opl)(kScratchRegister, value_reg);
      __ lock();
      __ cmpxchgl(dst_op, kScratchRegister);
      __ j(not_equal, &binop);
      break;
    }
    case StoreType::kI64Store: {
      Label binop;
      __ movq(rax, dst_op);
      __ bind(&binop);
      __ movq(kScratchRegister, rax);
      (lasm->*opq)(kScratchRegister, value_reg);
      __ lock();
      __ cmpxchgq(dst_op, kScratchRegister);
      __ j(not_equal, &binop);
      break;
    }
    default:
      UNREACHABLE();
  }

  if (result.gp() != rax) {
    __ movq(result.gp(), rax);
  }
}
#undef __
}  // namespace liftoff

void LiftoffAssembler::AtomicAnd(Register dst_addr, Register offset_reg,
                                 uint32_t offset_imm, LiftoffRegister value,
                                 LiftoffRegister result, StoreType type) {
  liftoff::AtomicBinop(this, &Assembler::andl, &Assembler::andq, dst_addr,
                       offset_reg, offset_imm, value, result, type);
}

void LiftoffAssembler::AtomicOr(Register dst_addr, Register offset_reg,
                                uint32_t offset_imm, LiftoffRegister value,
                                LiftoffRegister result, StoreType type) {
  liftoff::AtomicBinop(this, &Assembler::orl, &Assembler::orq, dst_addr,
                       offset_reg, offset_imm, value, result, type);
}

void LiftoffAssembler::AtomicXor(Register dst_addr, Register offset_reg,
                                 uint32_t offset_imm, LiftoffRegister value,
                                 LiftoffRegister result, StoreType type) {
  liftoff::AtomicBinop(this, &Assembler::xorl, &Assembler::xorq, dst_addr,
                       offset_reg, offset_imm, value, result, type);
}

void LiftoffAssembler::AtomicExchange(Register dst_addr, Register offset_reg,
                                      uint32_t offset_imm,
                                      LiftoffRegister value,
                                      LiftoffRegister result, StoreType type) {
  DCHECK(!cache_state()->is_used(result));
  if (cache_state()->is_used(value)) {
    // We cannot overwrite {value}, but the {value} register is changed in the
    // code we generate. Therefore we copy {value} to {result} and use the
    // {result} register in the code below.
    movq(result.gp(), value.gp());
    value = result;
  }
  if (emit_debug_code() && offset_reg != no_reg) {
    AssertZeroExtended(offset_reg);
  }
  Operand dst_op = liftoff::GetMemOp(this, dst_addr, offset_reg, offset_imm);
  switch (type.value()) {
    case StoreType::kI32Store8:
    case StoreType::kI64Store8:
      xchgb(value.gp(), dst_op);
      movzxbq(result.gp(), value.gp());
      break;
    case StoreType::kI32Store16:
    case StoreType::kI64Store16:
      xchgw(value.gp(), dst_op);
      movzxwq(result.gp(), value.gp());
      break;
    case StoreType::kI32Store:
    case StoreType::kI64Store32:
      xchgl(value.gp(), dst_op);
      if (value != result) {
        movq(result.gp(), value.gp());
      }
      break;
    case StoreType::kI64Store:
      xchgq(value.gp(), dst_op);
      if (value != result) {
        movq(result.gp(), value.gp());
      }
      break;
    default:
      UNREACHABLE();
  }
}

void LiftoffAssembler::AtomicCompareExchange(
    Register dst_addr, Register offset_reg, uint32_t offset_imm,
    LiftoffRegister expected, LiftoffRegister new_value, LiftoffRegister result,
    StoreType type) {
  Register value_reg = new_value.gp();
  // The cmpxchg instruction uses rax to store the old value of the
  // compare-exchange primitive. Therefore we have to spill the register and
  // move any use to another register.
  LiftoffRegList pinned =
      LiftoffRegList::ForRegs(dst_addr, offset_reg, expected, value_reg);
  ClearRegister(rax, {&dst_addr, &offset_reg, &value_reg}, pinned);
  if (expected.gp() != rax) {
    movq(rax, expected.gp());
  }

  if (emit_debug_code() && offset_reg != no_reg) {
    AssertZeroExtended(offset_reg);
  }
  Operand dst_op = liftoff::GetMemOp(this, dst_addr, offset_reg, offset_imm);

  lock();
  switch (type.value()) {
    case StoreType::kI32Store8:
    case StoreType::kI64Store8: {
      cmpxchgb(dst_op, value_reg);
      movzxbq(result.gp(), rax);
      break;
    }
    case StoreType::kI32Store16:
    case StoreType::kI64Store16: {
      cmpxchgw(dst_op, value_reg);
      movzxwq(result.gp(), rax);
      break;
    }
    case StoreType::kI32Store: {
      cmpxchgl(dst_op, value_reg);
      if (result.gp() != rax) {
        movl(result.gp(), rax);
      }
      break;
    }
    case StoreType::kI64Store32: {
      cmpxchgl(dst_op, value_reg);
      // Zero extension.
      movl(result.gp(), rax);
      break;
    }
    case StoreType::kI64Store: {
      cmpxchgq(dst_op, value_reg);
      if (result.gp() != rax) {
        movq(result.gp(), rax);
      }
      break;
    }
    default:
      UNREACHABLE();
  }
}

void LiftoffAssembler::AtomicFence() { mfence(); }

void LiftoffAssembler::LoadCallerFrameSlot(LiftoffRegister dst,
                                           uint32_t caller_slot_idx,
                                           ValueType type) {
  Operand src(rbp, kSystemPointerSize * (caller_slot_idx + 1));
  liftoff::Load(this, dst, src, type);
}

void LiftoffAssembler::StoreCallerFrameSlot(LiftoffRegister src,
                                            uint32_t caller_slot_idx,
                                            ValueType type) {
  Operand dst(rbp, kSystemPointerSize * (caller_slot_idx + 1));
  liftoff::Store(this, dst, src, type);
}

void LiftoffAssembler::LoadReturnStackSlot(LiftoffRegister reg, int offset,
                                           ValueType type) {
  Operand src(rsp, offset);
  liftoff::Load(this, reg, src, type);
}

void LiftoffAssembler::MoveStackValue(uint32_t dst_offset, uint32_t src_offset,
                                      ValueType type) {
  DCHECK_NE(dst_offset, src_offset);
  Operand dst = liftoff::GetStackSlot(dst_offset);
  Operand src = liftoff::GetStackSlot(src_offset);
  if (type.element_size_log2() == 2) {
    movl(kScratchRegister, src);
    movl(dst, kScratchRegister);
  } else {
    DCHECK_EQ(3, type.element_size_log2());
    movq(kScratchRegister, src);
    movq(dst, kScratchRegister);
  }
}

void LiftoffAssembler::Move(Register dst, Register src, ValueType type) {
  DCHECK_NE(dst, src);
  if (type == kWasmI32) {
    movl(dst, src);
  } else {
    DCHECK(kWasmI64 == type || type.is_reference_type());
    movq(dst, src);
  }
}

void LiftoffAssembler::Move(DoubleRegister dst, DoubleRegister src,
                            ValueType type) {
  DCHECK_NE(dst, src);
  if (type == kWasmF32) {
    Movss(dst, src);
  } else if (type == kWasmF64) {
    Movsd(dst, src);
  } else {
    DCHECK_EQ(kWasmS128, type);
    Movapd(dst, src);
  }
}

void LiftoffAssembler::Spill(int offset, LiftoffRegister reg, ValueType type) {
  RecordUsedSpillOffset(offset);
  Operand dst = liftoff::GetStackSlot(offset);
  switch (type.kind()) {
    case ValueType::kI32:
      movl(dst, reg.gp());
      break;
    case ValueType::kI64:
    case ValueType::kOptRef:
    case ValueType::kRef:
      movq(dst, reg.gp());
      break;
    case ValueType::kF32:
      Movss(dst, reg.fp());
      break;
    case ValueType::kF64:
      Movsd(dst, reg.fp());
      break;
    case ValueType::kS128:
      Movdqu(dst, reg.fp());
      break;
    default:
      UNREACHABLE();
  }
}

void LiftoffAssembler::Spill(int offset, WasmValue value) {
  RecordUsedSpillOffset(offset);
  Operand dst = liftoff::GetStackSlot(offset);
  switch (value.type().kind()) {
    case ValueType::kI32:
      movl(dst, Immediate(value.to_i32()));
      break;
    case ValueType::kI64: {
      if (is_int32(value.to_i64())) {
        // Sign extend low word.
        movq(dst, Immediate(static_cast<int32_t>(value.to_i64())));
      } else if (is_uint32(value.to_i64())) {
        // Zero extend low word.
        movl(kScratchRegister, Immediate(static_cast<int32_t>(value.to_i64())));
        movq(dst, kScratchRegister);
      } else {
        movq(kScratchRegister, value.to_i64());
        movq(dst, kScratchRegister);
      }
      break;
    }
    default:
      // We do not track f32 and f64 constants, hence they are unreachable.
      UNREACHABLE();
  }
}

void LiftoffAssembler::Fill(LiftoffRegister reg, int offset, ValueType type) {
  liftoff::Load(this, reg, liftoff::GetStackSlot(offset), type);
}

void LiftoffAssembler::FillI64Half(Register, int offset, RegPairHalf) {
  UNREACHABLE();
}

void LiftoffAssembler::FillStackSlotsWithZero(int start, int size) {
  DCHECK_LT(0, size);
  RecordUsedSpillOffset(start + size);

  if (size <= 3 * kStackSlotSize) {
    // Special straight-line code for up to three slots
    // (7-10 bytes per slot: REX C7 <1-4 bytes op> <4 bytes imm>),
    // And a movd (6-9 byte) when size % 8 != 0;
    uint32_t remainder = size;
    for (; remainder >= kStackSlotSize; remainder -= kStackSlotSize) {
      movq(liftoff::GetStackSlot(start + remainder), Immediate(0));
    }
    DCHECK(remainder == 4 || remainder == 0);
    if (remainder) {
      movl(liftoff::GetStackSlot(start + remainder), Immediate(0));
    }
  } else {
    // General case for bigger counts.
    // This sequence takes 19-22 bytes (3 for pushes, 4-7 for lea, 2 for xor, 5
    // for mov, 2 for repstosl, 3 for pops).
    pushq(rax);
    pushq(rcx);
    pushq(rdi);
    leaq(rdi, liftoff::GetStackSlot(start + size));
    xorl(rax, rax);
    // Convert size (bytes) to doublewords (4-bytes).
    movl(rcx, Immediate(size / 4));
    repstosl();
    popq(rdi);
    popq(rcx);
    popq(rax);
  }
}

void LiftoffAssembler::emit_i32_add(Register dst, Register lhs, Register rhs) {
  if (lhs != dst) {
    leal(dst, Operand(lhs, rhs, times_1, 0));
  } else {
    addl(dst, rhs);
  }
}

void LiftoffAssembler::emit_i32_addi(Register dst, Register lhs, int32_t imm) {
  if (lhs != dst) {
    leal(dst, Operand(lhs, imm));
  } else {
    addl(dst, Immediate(imm));
  }
}

void LiftoffAssembler::emit_i32_sub(Register dst, Register lhs, Register rhs) {
  if (dst != rhs) {
    // Default path.
    if (dst != lhs) movl(dst, lhs);
    subl(dst, rhs);
  } else if (lhs == rhs) {
    // Degenerate case.
    xorl(dst, dst);
  } else {
    // Emit {dst = lhs + -rhs} if dst == rhs.
    negl(dst);
    addl(dst, lhs);
  }
}

namespace liftoff {
template <void (Assembler::*op)(Register, Register),
          void (Assembler::*mov)(Register, Register)>
void EmitCommutativeBinOp(LiftoffAssembler* assm, Register dst, Register lhs,
                          Register rhs) {
  if (dst == rhs) {
    (assm->*op)(dst, lhs);
  } else {
    if (dst != lhs) (assm->*mov)(dst, lhs);
    (assm->*op)(dst, rhs);
  }
}

template <void (Assembler::*op)(Register, Immediate),
          void (Assembler::*mov)(Register, Register)>
void EmitCommutativeBinOpImm(LiftoffAssembler* assm, Register dst, Register lhs,
                             int32_t imm) {
  if (dst != lhs) (assm->*mov)(dst, lhs);
  (assm->*op)(dst, Immediate(imm));
}
}  // namespace liftoff

void LiftoffAssembler::emit_i32_mul(Register dst, Register lhs, Register rhs) {
  liftoff::EmitCommutativeBinOp<&Assembler::imull, &Assembler::movl>(this, dst,
                                                                     lhs, rhs);
}

namespace liftoff {
enum class DivOrRem : uint8_t { kDiv, kRem };
template <typename type, DivOrRem div_or_rem>
void EmitIntDivOrRem(LiftoffAssembler* assm, Register dst, Register lhs,
                     Register rhs, Label* trap_div_by_zero,
                     Label* trap_div_unrepresentable) {
  constexpr bool needs_unrepresentable_check =
      std::is_signed<type>::value && div_or_rem == DivOrRem::kDiv;
  constexpr bool special_case_minus_1 =
      std::is_signed<type>::value && div_or_rem == DivOrRem::kRem;
  DCHECK_EQ(needs_unrepresentable_check, trap_div_unrepresentable != nullptr);

#define iop(name, ...)            \
  do {                            \
    if (sizeof(type) == 4) {      \
      assm->name##l(__VA_ARGS__); \
    } else {                      \
      assm->name##q(__VA_ARGS__); \
    }                             \
  } while (false)

  // For division, the lhs is always taken from {edx:eax}. Thus, make sure that
  // these registers are unused. If {rhs} is stored in one of them, move it to
  // another temporary register.
  // Do all this before any branch, such that the code is executed
  // unconditionally, as the cache state will also be modified unconditionally.
  assm->SpillRegisters(rdx, rax);
  if (rhs == rax || rhs == rdx) {
    iop(mov, kScratchRegister, rhs);
    rhs = kScratchRegister;
  }

  // Check for division by zero.
  iop(test, rhs, rhs);
  assm->j(zero, trap_div_by_zero);

  Label done;
  if (needs_unrepresentable_check) {
    // Check for {kMinInt / -1}. This is unrepresentable.
    Label do_div;
    iop(cmp, rhs, Immediate(-1));
    assm->j(not_equal, &do_div);
    // {lhs} is min int if {lhs - 1} overflows.
    iop(cmp, lhs, Immediate(1));
    assm->j(overflow, trap_div_unrepresentable);
    assm->bind(&do_div);
  } else if (special_case_minus_1) {
    // {lhs % -1} is always 0 (needs to be special cased because {kMinInt / -1}
    // cannot be computed).
    Label do_rem;
    iop(cmp, rhs, Immediate(-1));
    assm->j(not_equal, &do_rem);
    // clang-format off
    // (conflicts with presubmit checks because it is confused about "xor")
    iop(xor, dst, dst);
    // clang-format on
    assm->jmp(&done);
    assm->bind(&do_rem);
  }

  // Now move {lhs} into {eax}, then zero-extend or sign-extend into {edx}, then
  // do the division.
  if (lhs != rax) iop(mov, rax, lhs);
  if (std::is_same<int32_t, type>::value) {  // i32
    assm->cdq();
    assm->idivl(rhs);
  } else if (std::is_same<uint32_t, type>::value) {  // u32
    assm->xorl(rdx, rdx);
    assm->divl(rhs);
  } else if (std::is_same<int64_t, type>::value) {  // i64
    assm->cqo();
    assm->idivq(rhs);
  } else {  // u64
    assm->xorq(rdx, rdx);
    assm->divq(rhs);
  }

  // Move back the result (in {eax} or {edx}) into the {dst} register.
  constexpr Register kResultReg = div_or_rem == DivOrRem::kDiv ? rax : rdx;
  if (dst != kResultReg) {
    iop(mov, dst, kResultReg);
  }
  if (special_case_minus_1) assm->bind(&done);
}
}  // namespace liftoff

void LiftoffAssembler::emit_i32_divs(Register dst, Register lhs, Register rhs,
                                     Label* trap_div_by_zero,
                                     Label* trap_div_unrepresentable) {
  liftoff::EmitIntDivOrRem<int32_t, liftoff::DivOrRem::kDiv>(
      this, dst, lhs, rhs, trap_div_by_zero, trap_div_unrepresentable);
}

void LiftoffAssembler::emit_i32_divu(Register dst, Register lhs, Register rhs,
                                     Label* trap_div_by_zero) {
  liftoff::EmitIntDivOrRem<uint32_t, liftoff::DivOrRem::kDiv>(
      this, dst, lhs, rhs, trap_div_by_zero, nullptr);
}

void LiftoffAssembler::emit_i32_rems(Register dst, Register lhs, Register rhs,
                                     Label* trap_div_by_zero) {
  liftoff::EmitIntDivOrRem<int32_t, liftoff::DivOrRem::kRem>(
      this, dst, lhs, rhs, trap_div_by_zero, nullptr);
}

void LiftoffAssembler::emit_i32_remu(Register dst, Register lhs, Register rhs,
                                     Label* trap_div_by_zero) {
  liftoff::EmitIntDivOrRem<uint32_t, liftoff::DivOrRem::kRem>(
      this, dst, lhs, rhs, trap_div_by_zero, nullptr);
}

void LiftoffAssembler::emit_i32_and(Register dst, Register lhs, Register rhs) {
  liftoff::EmitCommutativeBinOp<&Assembler::andl, &Assembler::movl>(this, dst,
                                                                    lhs, rhs);
}

void LiftoffAssembler::emit_i32_andi(Register dst, Register lhs, int32_t imm) {
  liftoff::EmitCommutativeBinOpImm<&Assembler::andl, &Assembler::movl>(
      this, dst, lhs, imm);
}

void LiftoffAssembler::emit_i32_or(Register dst, Register lhs, Register rhs) {
  liftoff::EmitCommutativeBinOp<&Assembler::orl, &Assembler::movl>(this, dst,
                                                                   lhs, rhs);
}

void LiftoffAssembler::emit_i32_ori(Register dst, Register lhs, int32_t imm) {
  liftoff::EmitCommutativeBinOpImm<&Assembler::orl, &Assembler::movl>(this, dst,
                                                                      lhs, imm);
}

void LiftoffAssembler::emit_i32_xor(Register dst, Register lhs, Register rhs) {
  liftoff::EmitCommutativeBinOp<&Assembler::xorl, &Assembler::movl>(this, dst,
                                                                    lhs, rhs);
}

void LiftoffAssembler::emit_i32_xori(Register dst, Register lhs, int32_t imm) {
  liftoff::EmitCommutativeBinOpImm<&Assembler::xorl, &Assembler::movl>(
      this, dst, lhs, imm);
}

namespace liftoff {
template <ValueType::Kind type>
inline void EmitShiftOperation(LiftoffAssembler* assm, Register dst,
                               Register src, Register amount,
                               void (Assembler::*emit_shift)(Register)) {
  // If dst is rcx, compute into the scratch register first, then move to rcx.
  if (dst == rcx) {
    assm->Move(kScratchRegister, src, ValueType::Primitive(type));
    if (amount != rcx) assm->Move(rcx, amount, ValueType::Primitive(type));
    (assm->*emit_shift)(kScratchRegister);
    assm->Move(rcx, kScratchRegister, ValueType::Primitive(type));
    return;
  }

  // Move amount into rcx. If rcx is in use, move its content into the scratch
  // register. If src is rcx, src is now the scratch register.
  bool use_scratch = false;
  if (amount != rcx) {
    use_scratch =
        src == rcx || assm->cache_state()->is_used(LiftoffRegister(rcx));
    if (use_scratch) assm->movq(kScratchRegister, rcx);
    if (src == rcx) src = kScratchRegister;
    assm->Move(rcx, amount, ValueType::Primitive(type));
  }

  // Do the actual shift.
  if (dst != src) assm->Move(dst, src, ValueType::Primitive(type));
  (assm->*emit_shift)(dst);

  // Restore rcx if needed.
  if (use_scratch) assm->movq(rcx, kScratchRegister);
}
}  // namespace liftoff

void LiftoffAssembler::emit_i32_shl(Register dst, Register src,
                                    Register amount) {
  liftoff::EmitShiftOperation<ValueType::kI32>(this, dst, src, amount,
                                               &Assembler::shll_cl);
}

void LiftoffAssembler::emit_i32_shli(Register dst, Register src,
                                     int32_t amount) {
  if (dst != src) movl(dst, src);
  shll(dst, Immediate(amount & 31));
}

void LiftoffAssembler::emit_i32_sar(Register dst, Register src,
                                    Register amount) {
  liftoff::EmitShiftOperation<ValueType::kI32>(this, dst, src, amount,
                                               &Assembler::sarl_cl);
}

void LiftoffAssembler::emit_i32_sari(Register dst, Register src,
                                     int32_t amount) {
  if (dst != src) movl(dst, src);
  sarl(dst, Immediate(amount & 31));
}

void LiftoffAssembler::emit_i32_shr(Register dst, Register src,
                                    Register amount) {
  liftoff::EmitShiftOperation<ValueType::kI32>(this, dst, src, amount,
                                               &Assembler::shrl_cl);
}

void LiftoffAssembler::emit_i32_shri(Register dst, Register src,
                                     int32_t amount) {
  if (dst != src) movl(dst, src);
  shrl(dst, Immediate(amount & 31));
}

void LiftoffAssembler::emit_i32_clz(Register dst, Register src) {
  Lzcntl(dst, src);
}

void LiftoffAssembler::emit_i32_ctz(Register dst, Register src) {
  Tzcntl(dst, src);
}

bool LiftoffAssembler::emit_i32_popcnt(Register dst, Register src) {
  if (!CpuFeatures::IsSupported(POPCNT)) return false;
  CpuFeatureScope scope(this, POPCNT);
  popcntl(dst, src);
  return true;
}

void LiftoffAssembler::emit_i64_add(LiftoffRegister dst, LiftoffRegister lhs,
                                    LiftoffRegister rhs) {
  if (lhs.gp() != dst.gp()) {
    leaq(dst.gp(), Operand(lhs.gp(), rhs.gp(), times_1, 0));
  } else {
    addq(dst.gp(), rhs.gp());
  }
}

void LiftoffAssembler::emit_i64_addi(LiftoffRegister dst, LiftoffRegister lhs,
                                     int32_t imm) {
  if (lhs.gp() != dst.gp()) {
    leaq(dst.gp(), Operand(lhs.gp(), imm));
  } else {
    addq(dst.gp(), Immediate(imm));
  }
}

void LiftoffAssembler::emit_i64_sub(LiftoffRegister dst, LiftoffRegister lhs,
                                    LiftoffRegister rhs) {
  if (dst.gp() == rhs.gp()) {
    negq(dst.gp());
    addq(dst.gp(), lhs.gp());
  } else {
    if (dst.gp() != lhs.gp()) movq(dst.gp(), lhs.gp());
    subq(dst.gp(), rhs.gp());
  }
}

void LiftoffAssembler::emit_i64_mul(LiftoffRegister dst, LiftoffRegister lhs,
                                    LiftoffRegister rhs) {
  liftoff::EmitCommutativeBinOp<&Assembler::imulq, &Assembler::movq>(
      this, dst.gp(), lhs.gp(), rhs.gp());
}

bool LiftoffAssembler::emit_i64_divs(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs,
                                     Label* trap_div_by_zero,
                                     Label* trap_div_unrepresentable) {
  liftoff::EmitIntDivOrRem<int64_t, liftoff::DivOrRem::kDiv>(
      this, dst.gp(), lhs.gp(), rhs.gp(), trap_div_by_zero,
      trap_div_unrepresentable);
  return true;
}

bool LiftoffAssembler::emit_i64_divu(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs,
                                     Label* trap_div_by_zero) {
  liftoff::EmitIntDivOrRem<uint64_t, liftoff::DivOrRem::kDiv>(
      this, dst.gp(), lhs.gp(), rhs.gp(), trap_div_by_zero, nullptr);
  return true;
}

bool LiftoffAssembler::emit_i64_rems(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs,
                                     Label* trap_div_by_zero) {
  liftoff::EmitIntDivOrRem<int64_t, liftoff::DivOrRem::kRem>(
      this, dst.gp(), lhs.gp(), rhs.gp(), trap_div_by_zero, nullptr);
  return true;
}

bool LiftoffAssembler::emit_i64_remu(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs,
                                     Label* trap_div_by_zero) {
  liftoff::EmitIntDivOrRem<uint64_t, liftoff::DivOrRem::kRem>(
      this, dst.gp(), lhs.gp(), rhs.gp(), trap_div_by_zero, nullptr);
  return true;
}

void LiftoffAssembler::emit_i64_and(LiftoffRegister dst, LiftoffRegister lhs,
                                    LiftoffRegister rhs) {
  liftoff::EmitCommutativeBinOp<&Assembler::andq, &Assembler::movq>(
      this, dst.gp(), lhs.gp(), rhs.gp());
}

void LiftoffAssembler::emit_i64_andi(LiftoffRegister dst, LiftoffRegister lhs,
                                     int32_t imm) {
  liftoff::EmitCommutativeBinOpImm<&Assembler::andq, &Assembler::movq>(
      this, dst.gp(), lhs.gp(), imm);
}

void LiftoffAssembler::emit_i64_or(LiftoffRegister dst, LiftoffRegister lhs,
                                   LiftoffRegister rhs) {
  liftoff::EmitCommutativeBinOp<&Assembler::orq, &Assembler::movq>(
      this, dst.gp(), lhs.gp(), rhs.gp());
}

void LiftoffAssembler::emit_i64_ori(LiftoffRegister dst, LiftoffRegister lhs,
                                    int32_t imm) {
  liftoff::EmitCommutativeBinOpImm<&Assembler::orq, &Assembler::movq>(
      this, dst.gp(), lhs.gp(), imm);
}

void LiftoffAssembler::emit_i64_xor(LiftoffRegister dst, LiftoffRegister lhs,
                                    LiftoffRegister rhs) {
  liftoff::EmitCommutativeBinOp<&Assembler::xorq, &Assembler::movq>(
      this, dst.gp(), lhs.gp(), rhs.gp());
}

void LiftoffAssembler::emit_i64_xori(LiftoffRegister dst, LiftoffRegister lhs,
                                     int32_t imm) {
  liftoff::EmitCommutativeBinOpImm<&Assembler::xorq, &Assembler::movq>(
      this, dst.gp(), lhs.gp(), imm);
}

void LiftoffAssembler::emit_i64_shl(LiftoffRegister dst, LiftoffRegister src,
                                    Register amount) {
  liftoff::EmitShiftOperation<ValueType::kI64>(this, dst.gp(), src.gp(), amount,
                                               &Assembler::shlq_cl);
}

void LiftoffAssembler::emit_i64_shli(LiftoffRegister dst, LiftoffRegister src,
                                     int32_t amount) {
  if (dst.gp() != src.gp()) movq(dst.gp(), src.gp());
  shlq(dst.gp(), Immediate(amount & 63));
}

void LiftoffAssembler::emit_i64_sar(LiftoffRegister dst, LiftoffRegister src,
                                    Register amount) {
  liftoff::EmitShiftOperation<ValueType::kI64>(this, dst.gp(), src.gp(), amount,
                                               &Assembler::sarq_cl);
}

void LiftoffAssembler::emit_i64_sari(LiftoffRegister dst, LiftoffRegister src,
                                     int32_t amount) {
  if (dst.gp() != src.gp()) movq(dst.gp(), src.gp());
  sarq(dst.gp(), Immediate(amount & 63));
}

void LiftoffAssembler::emit_i64_shr(LiftoffRegister dst, LiftoffRegister src,
                                    Register amount) {
  liftoff::EmitShiftOperation<ValueType::kI64>(this, dst.gp(), src.gp(), amount,
                                               &Assembler::shrq_cl);
}

void LiftoffAssembler::emit_i64_shri(LiftoffRegister dst, LiftoffRegister src,
                                     int32_t amount) {
  if (dst != src) movq(dst.gp(), src.gp());
  shrq(dst.gp(), Immediate(amount & 63));
}

void LiftoffAssembler::emit_i64_clz(LiftoffRegister dst, LiftoffRegister src) {
  Lzcntq(dst.gp(), src.gp());
}

void LiftoffAssembler::emit_i64_ctz(LiftoffRegister dst, LiftoffRegister src) {
  Tzcntq(dst.gp(), src.gp());
}

bool LiftoffAssembler::emit_i64_popcnt(LiftoffRegister dst,
                                       LiftoffRegister src) {
  if (!CpuFeatures::IsSupported(POPCNT)) return false;
  CpuFeatureScope scope(this, POPCNT);
  popcntq(dst.gp(), src.gp());
  return true;
}

void LiftoffAssembler::emit_u32_to_intptr(Register dst, Register src) {
  movl(dst, src);
}

void LiftoffAssembler::emit_f32_add(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vaddss(dst, lhs, rhs);
  } else if (dst == rhs) {
    addss(dst, lhs);
  } else {
    if (dst != lhs) movss(dst, lhs);
    addss(dst, rhs);
  }
}

void LiftoffAssembler::emit_f32_sub(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vsubss(dst, lhs, rhs);
  } else if (dst == rhs) {
    movss(kScratchDoubleReg, rhs);
    movss(dst, lhs);
    subss(dst, kScratchDoubleReg);
  } else {
    if (dst != lhs) movss(dst, lhs);
    subss(dst, rhs);
  }
}

void LiftoffAssembler::emit_f32_mul(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vmulss(dst, lhs, rhs);
  } else if (dst == rhs) {
    mulss(dst, lhs);
  } else {
    if (dst != lhs) movss(dst, lhs);
    mulss(dst, rhs);
  }
}

void LiftoffAssembler::emit_f32_div(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vdivss(dst, lhs, rhs);
  } else if (dst == rhs) {
    movss(kScratchDoubleReg, rhs);
    movss(dst, lhs);
    divss(dst, kScratchDoubleReg);
  } else {
    if (dst != lhs) movss(dst, lhs);
    divss(dst, rhs);
  }
}

namespace liftoff {
enum class MinOrMax : uint8_t { kMin, kMax };
template <typename type>
inline void EmitFloatMinOrMax(LiftoffAssembler* assm, DoubleRegister dst,
                              DoubleRegister lhs, DoubleRegister rhs,
                              MinOrMax min_or_max) {
  Label is_nan;
  Label lhs_below_rhs;
  Label lhs_above_rhs;
  Label done;

#define dop(name, ...)            \
  do {                            \
    if (sizeof(type) == 4) {      \
      assm->name##s(__VA_ARGS__); \
    } else {                      \
      assm->name##d(__VA_ARGS__); \
    }                             \
  } while (false)

  // Check the easy cases first: nan (e.g. unordered), smaller and greater.
  // NaN has to be checked first, because PF=1 implies CF=1.
  dop(Ucomis, lhs, rhs);
  assm->j(parity_even, &is_nan, Label::kNear);   // PF=1
  assm->j(below, &lhs_below_rhs, Label::kNear);  // CF=1
  assm->j(above, &lhs_above_rhs, Label::kNear);  // CF=0 && ZF=0

  // If we get here, then either
  // a) {lhs == rhs},
  // b) {lhs == -0.0} and {rhs == 0.0}, or
  // c) {lhs == 0.0} and {rhs == -0.0}.
  // For a), it does not matter whether we return {lhs} or {rhs}. Check the sign
  // bit of {rhs} to differentiate b) and c).
  dop(Movmskp, kScratchRegister, rhs);
  assm->testl(kScratchRegister, Immediate(1));
  assm->j(zero, &lhs_below_rhs, Label::kNear);
  assm->jmp(&lhs_above_rhs, Label::kNear);

  assm->bind(&is_nan);
  // Create a NaN output.
  dop(Xorp, dst, dst);
  dop(Divs, dst, dst);
  assm->jmp(&done, Label::kNear);

  assm->bind(&lhs_below_rhs);
  DoubleRegister lhs_below_rhs_src = min_or_max == MinOrMax::kMin ? lhs : rhs;
  if (dst != lhs_below_rhs_src) dop(Movs, dst, lhs_below_rhs_src);
  assm->jmp(&done, Label::kNear);

  assm->bind(&lhs_above_rhs);
  DoubleRegister lhs_above_rhs_src = min_or_max == MinOrMax::kMin ? rhs : lhs;
  if (dst != lhs_above_rhs_src) dop(Movs, dst, lhs_above_rhs_src);

  assm->bind(&done);
}
}  // namespace liftoff

void LiftoffAssembler::emit_f32_min(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  liftoff::EmitFloatMinOrMax<float>(this, dst, lhs, rhs,
                                    liftoff::MinOrMax::kMin);
}

void LiftoffAssembler::emit_f32_max(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  liftoff::EmitFloatMinOrMax<float>(this, dst, lhs, rhs,
                                    liftoff::MinOrMax::kMax);
}

void LiftoffAssembler::emit_f32_copysign(DoubleRegister dst, DoubleRegister lhs,
                                         DoubleRegister rhs) {
  static constexpr int kF32SignBit = 1 << 31;
  Movd(kScratchRegister, lhs);
  andl(kScratchRegister, Immediate(~kF32SignBit));
  Movd(liftoff::kScratchRegister2, rhs);
  andl(liftoff::kScratchRegister2, Immediate(kF32SignBit));
  orl(kScratchRegister, liftoff::kScratchRegister2);
  Movd(dst, kScratchRegister);
}

void LiftoffAssembler::emit_f32_abs(DoubleRegister dst, DoubleRegister src) {
  static constexpr uint32_t kSignBit = uint32_t{1} << 31;
  if (dst == src) {
    TurboAssembler::Move(kScratchDoubleReg, kSignBit - 1);
    Andps(dst, kScratchDoubleReg);
  } else {
    TurboAssembler::Move(dst, kSignBit - 1);
    Andps(dst, src);
  }
}

void LiftoffAssembler::emit_f32_neg(DoubleRegister dst, DoubleRegister src) {
  static constexpr uint32_t kSignBit = uint32_t{1} << 31;
  if (dst == src) {
    TurboAssembler::Move(kScratchDoubleReg, kSignBit);
    Xorps(dst, kScratchDoubleReg);
  } else {
    TurboAssembler::Move(dst, kSignBit);
    Xorps(dst, src);
  }
}

bool LiftoffAssembler::emit_f32_ceil(DoubleRegister dst, DoubleRegister src) {
  RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
  Roundss(dst, src, kRoundUp);
  return true;
}

bool LiftoffAssembler::emit_f32_floor(DoubleRegister dst, DoubleRegister src) {
  RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
  Roundss(dst, src, kRoundDown);
  return true;
}

bool LiftoffAssembler::emit_f32_trunc(DoubleRegister dst, DoubleRegister src) {
  RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
  Roundss(dst, src, kRoundToZero);
  return true;
}

bool LiftoffAssembler::emit_f32_nearest_int(DoubleRegister dst,
                                            DoubleRegister src) {
  RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
  Roundss(dst, src, kRoundToNearest);
  return true;
}

void LiftoffAssembler::emit_f32_sqrt(DoubleRegister dst, DoubleRegister src) {
  Sqrtss(dst, src);
}

void LiftoffAssembler::emit_f64_add(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vaddsd(dst, lhs, rhs);
  } else if (dst == rhs) {
    addsd(dst, lhs);
  } else {
    if (dst != lhs) movsd(dst, lhs);
    addsd(dst, rhs);
  }
}

void LiftoffAssembler::emit_f64_sub(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vsubsd(dst, lhs, rhs);
  } else if (dst == rhs) {
    movsd(kScratchDoubleReg, rhs);
    movsd(dst, lhs);
    subsd(dst, kScratchDoubleReg);
  } else {
    if (dst != lhs) movsd(dst, lhs);
    subsd(dst, rhs);
  }
}

void LiftoffAssembler::emit_f64_mul(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vmulsd(dst, lhs, rhs);
  } else if (dst == rhs) {
    mulsd(dst, lhs);
  } else {
    if (dst != lhs) movsd(dst, lhs);
    mulsd(dst, rhs);
  }
}

void LiftoffAssembler::emit_f64_div(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vdivsd(dst, lhs, rhs);
  } else if (dst == rhs) {
    movsd(kScratchDoubleReg, rhs);
    movsd(dst, lhs);
    divsd(dst, kScratchDoubleReg);
  } else {
    if (dst != lhs) movsd(dst, lhs);
    divsd(dst, rhs);
  }
}

void LiftoffAssembler::emit_f64_min(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  liftoff::EmitFloatMinOrMax<double>(this, dst, lhs, rhs,
                                     liftoff::MinOrMax::kMin);
}

void LiftoffAssembler::emit_f64_copysign(DoubleRegister dst, DoubleRegister lhs,
                                         DoubleRegister rhs) {
  // Extract sign bit from {rhs} into {kScratchRegister2}.
  Movq(liftoff::kScratchRegister2, rhs);
  shrq(liftoff::kScratchRegister2, Immediate(63));
  shlq(liftoff::kScratchRegister2, Immediate(63));
  // Reset sign bit of {lhs} (in {kScratchRegister}).
  Movq(kScratchRegister, lhs);
  btrq(kScratchRegister, Immediate(63));
  // Combine both values into {kScratchRegister} and move into {dst}.
  orq(kScratchRegister, liftoff::kScratchRegister2);
  Movq(dst, kScratchRegister);
}

void LiftoffAssembler::emit_f64_max(DoubleRegister dst, DoubleRegister lhs,
                                    DoubleRegister rhs) {
  liftoff::EmitFloatMinOrMax<double>(this, dst, lhs, rhs,
                                     liftoff::MinOrMax::kMax);
}

void LiftoffAssembler::emit_f64_abs(DoubleRegister dst, DoubleRegister src) {
  static constexpr uint64_t kSignBit = uint64_t{1} << 63;
  if (dst == src) {
    TurboAssembler::Move(kScratchDoubleReg, kSignBit - 1);
    Andpd(dst, kScratchDoubleReg);
  } else {
    TurboAssembler::Move(dst, kSignBit - 1);
    Andpd(dst, src);
  }
}

void LiftoffAssembler::emit_f64_neg(DoubleRegister dst, DoubleRegister src) {
  static constexpr uint64_t kSignBit = uint64_t{1} << 63;
  if (dst == src) {
    TurboAssembler::Move(kScratchDoubleReg, kSignBit);
    Xorpd(dst, kScratchDoubleReg);
  } else {
    TurboAssembler::Move(dst, kSignBit);
    Xorpd(dst, src);
  }
}

bool LiftoffAssembler::emit_f64_ceil(DoubleRegister dst, DoubleRegister src) {
  RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
  Roundsd(dst, src, kRoundUp);
  return true;
}

bool LiftoffAssembler::emit_f64_floor(DoubleRegister dst, DoubleRegister src) {
  RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
  Roundsd(dst, src, kRoundDown);
  return true;
}

bool LiftoffAssembler::emit_f64_trunc(DoubleRegister dst, DoubleRegister src) {
  RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
  Roundsd(dst, src, kRoundToZero);
  return true;
}

bool LiftoffAssembler::emit_f64_nearest_int(DoubleRegister dst,
                                            DoubleRegister src) {
  RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
  Roundsd(dst, src, kRoundToNearest);
  return true;
}

void LiftoffAssembler::emit_f64_sqrt(DoubleRegister dst, DoubleRegister src) {
  Sqrtsd(dst, src);
}

namespace liftoff {
#define __ assm->
// Used for float to int conversions. If the value in {converted_back} equals
// {src} afterwards, the conversion succeeded.
template <typename dst_type, typename src_type>
inline void ConvertFloatToIntAndBack(LiftoffAssembler* assm, Register dst,
                                     DoubleRegister src,
                                     DoubleRegister converted_back) {
  if (std::is_same<double, src_type>::value) {  // f64
    if (std::is_same<int32_t, dst_type>::value) {  // f64 -> i32
      __ Cvttsd2si(dst, src);
      __ Cvtlsi2sd(converted_back, dst);
    } else if (std::is_same<uint32_t, dst_type>::value) {  // f64 -> u32
      __ Cvttsd2siq(dst, src);
      __ movl(dst, dst);
      __ Cvtqsi2sd(converted_back, dst);
    } else if (std::is_same<int64_t, dst_type>::value) {  // f64 -> i64
      __ Cvttsd2siq(dst, src);
      __ Cvtqsi2sd(converted_back, dst);
    } else {
      UNREACHABLE();
    }
  } else {                                  // f32
    if (std::is_same<int32_t, dst_type>::value) {  // f32 -> i32
      __ Cvttss2si(dst, src);
      __ Cvtlsi2ss(converted_back, dst);
    } else if (std::is_same<uint32_t, dst_type>::value) {  // f32 -> u32
      __ Cvttss2siq(dst, src);
      __ movl(dst, dst);
      __ Cvtqsi2ss(converted_back, dst);
    } else if (std::is_same<int64_t, dst_type>::value) {  // f32 -> i64
      __ Cvttss2siq(dst, src);
      __ Cvtqsi2ss(converted_back, dst);
    } else {
      UNREACHABLE();
    }
  }
}

template <typename dst_type, typename src_type>
inline bool EmitTruncateFloatToInt(LiftoffAssembler* assm, Register dst,
                                   DoubleRegister src, Label* trap) {
  if (!CpuFeatures::IsSupported(SSE4_1)) {
    __ bailout(kMissingCPUFeature, "no SSE4.1");
    return true;
  }
  CpuFeatureScope feature(assm, SSE4_1);

  DoubleRegister rounded = kScratchDoubleReg;
  DoubleRegister converted_back = kScratchDoubleReg2;

  if (std::is_same<double, src_type>::value) {  // f64
    __ Roundsd(rounded, src, kRoundToZero);
  } else {  // f32
    __ Roundss(rounded, src, kRoundToZero);
  }
  ConvertFloatToIntAndBack<dst_type, src_type>(assm, dst, rounded,
                                               converted_back);
  if (std::is_same<double, src_type>::value) {  // f64
    __ Ucomisd(converted_back, rounded);
  } else {  // f32
    __ Ucomiss(converted_back, rounded);
  }

  // Jump to trap if PF is 0 (one of the operands was NaN) or they are not
  // equal.
  __ j(parity_even, trap);
  __ j(not_equal, trap);
  return true;
}

template <typename dst_type, typename src_type>
inline bool EmitSatTruncateFloatToInt(LiftoffAssembler* assm, Register dst,
                                      DoubleRegister src) {
  if (!CpuFeatures::IsSupported(SSE4_1)) {
    __ bailout(kMissingCPUFeature, "no SSE4.1");
    return true;
  }
  CpuFeatureScope feature(assm, SSE4_1);

  Label done;
  Label not_nan;
  Label src_positive;

  DoubleRegister rounded = kScratchDoubleReg;
  DoubleRegister converted_back = kScratchDoubleReg2;
  DoubleRegister zero_reg = kScratchDoubleReg;

  if (std::is_same<double, src_type>::value) {  // f64
    __ Roundsd(rounded, src, kRoundToZero);
  } else {  // f32
    __ Roundss(rounded, src, kRoundToZero);
  }

  ConvertFloatToIntAndBack<dst_type, src_type>(assm, dst, rounded,
                                               converted_back);
  if (std::is_same<double, src_type>::value) {  // f64
    __ Ucomisd(converted_back, rounded);
  } else {  // f32
    __ Ucomiss(converted_back, rounded);
  }

  // Return 0 if PF is 0 (one of the operands was NaN)
  __ j(parity_odd, &not_nan);
  __ xorl(dst, dst);
  __ jmp(&done);

  __ bind(&not_nan);
  // If rounding is as expected, return result
  __ j(equal, &done);

  __ xorpd(zero_reg, zero_reg);

  // if out-of-bounds, check if src is positive
  if (std::is_same<double, src_type>::value) {  // f64
    __ Ucomisd(src, zero_reg);
  } else {  // f32
    __ Ucomiss(src, zero_reg);
  }
  __ j(above, &src_positive);
  if (std::is_same<int32_t, dst_type>::value ||
      std::is_same<uint32_t, dst_type>::value) {  // i32
    __ movl(
        dst,
        Immediate(static_cast<int32_t>(std::numeric_limits<dst_type>::min())));
  } else if (std::is_same<int64_t, dst_type>::value) {  // i64s
    __ movq(dst, Immediate64(std::numeric_limits<dst_type>::min()));
  } else {
    UNREACHABLE();
  }
  __ jmp(&done);

  __ bind(&src_positive);
  if (std::is_same<int32_t, dst_type>::value ||
      std::is_same<uint32_t, dst_type>::value) {  // i32
    __ movl(
        dst,
        Immediate(static_cast<int32_t>(std::numeric_limits<dst_type>::max())));
  } else if (std::is_same<int64_t, dst_type>::value) {  // i64s
    __ movq(dst, Immediate64(std::numeric_limits<dst_type>::max()));
  } else {
    UNREACHABLE();
  }

  __ bind(&done);
  return true;
}

template <typename src_type>
inline bool EmitSatTruncateFloatToUInt64(LiftoffAssembler* assm, Register dst,
                                         DoubleRegister src) {
  if (!CpuFeatures::IsSupported(SSE4_1)) {
    __ bailout(kMissingCPUFeature, "no SSE4.1");
    return true;
  }
  CpuFeatureScope feature(assm, SSE4_1);

  Label done;
  Label neg_or_nan;
  Label overflow;

  DoubleRegister zero_reg = kScratchDoubleReg;

  __ xorpd(zero_reg, zero_reg);
  if (std::is_same<double, src_type>::value) {  // f64
    __ Ucomisd(src, zero_reg);
  } else {  // f32
    __ Ucomiss(src, zero_reg);
  }
  // Check if NaN
  __ j(parity_even, &neg_or_nan);
  __ j(below, &neg_or_nan);
  if (std::is_same<double, src_type>::value) {  // f64
    __ Cvttsd2uiq(dst, src, &overflow);
  } else {  // f32
    __ Cvttss2uiq(dst, src, &overflow);
  }
  __ jmp(&done);

  __ bind(&neg_or_nan);
  __ movq(dst, zero_reg);
  __ jmp(&done);

  __ bind(&overflow);
  __ movq(dst, Immediate64(std::numeric_limits<uint64_t>::max()));
  __ bind(&done);
  return true;
}
#undef __
}  // namespace liftoff

bool LiftoffAssembler::emit_type_conversion(WasmOpcode opcode,
                                            LiftoffRegister dst,
                                            LiftoffRegister src, Label* trap) {
  switch (opcode) {
    case kExprI32ConvertI64:
      movl(dst.gp(), src.gp());
      return true;
    case kExprI32SConvertF32:
      return liftoff::EmitTruncateFloatToInt<int32_t, float>(this, dst.gp(),
                                                             src.fp(), trap);
    case kExprI32UConvertF32:
      return liftoff::EmitTruncateFloatToInt<uint32_t, float>(this, dst.gp(),
                                                              src.fp(), trap);
    case kExprI32SConvertF64:
      return liftoff::EmitTruncateFloatToInt<int32_t, double>(this, dst.gp(),
                                                              src.fp(), trap);
    case kExprI32UConvertF64:
      return liftoff::EmitTruncateFloatToInt<uint32_t, double>(this, dst.gp(),
                                                               src.fp(), trap);
    case kExprI32SConvertSatF32:
      return liftoff::EmitSatTruncateFloatToInt<int32_t, float>(this, dst.gp(),
                                                                src.fp());
    case kExprI32UConvertSatF32:
      return liftoff::EmitSatTruncateFloatToInt<uint32_t, float>(this, dst.gp(),
                                                                 src.fp());
    case kExprI32SConvertSatF64:
      return liftoff::EmitSatTruncateFloatToInt<int32_t, double>(this, dst.gp(),
                                                                 src.fp());
    case kExprI32UConvertSatF64:
      return liftoff::EmitSatTruncateFloatToInt<uint32_t, double>(
          this, dst.gp(), src.fp());
    case kExprI32ReinterpretF32:
      Movd(dst.gp(), src.fp());
      return true;
    case kExprI64SConvertI32:
      movsxlq(dst.gp(), src.gp());
      return true;
    case kExprI64SConvertF32:
      return liftoff::EmitTruncateFloatToInt<int64_t, float>(this, dst.gp(),
                                                             src.fp(), trap);
    case kExprI64UConvertF32: {
      RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
      Cvttss2uiq(dst.gp(), src.fp(), trap);
      return true;
    }
    case kExprI64SConvertF64:
      return liftoff::EmitTruncateFloatToInt<int64_t, double>(this, dst.gp(),
                                                              src.fp(), trap);
    case kExprI64UConvertF64: {
      RETURN_FALSE_IF_MISSING_CPU_FEATURE(SSE4_1);
      Cvttsd2uiq(dst.gp(), src.fp(), trap);
      return true;
    }
    case kExprI64SConvertSatF32:
      return liftoff::EmitSatTruncateFloatToInt<int64_t, float>(this, dst.gp(),
                                                                src.fp());
    case kExprI64UConvertSatF32: {
      return liftoff::EmitSatTruncateFloatToUInt64<float>(this, dst.gp(),
                                                          src.fp());
    }
    case kExprI64SConvertSatF64:
      return liftoff::EmitSatTruncateFloatToInt<int64_t, double>(this, dst.gp(),
                                                                 src.fp());
    case kExprI64UConvertSatF64: {
      return liftoff::EmitSatTruncateFloatToUInt64<double>(this, dst.gp(),
                                                           src.fp());
    }
    case kExprI64UConvertI32:
      AssertZeroExtended(src.gp());
      if (dst.gp() != src.gp()) movl(dst.gp(), src.gp());
      return true;
    case kExprI64ReinterpretF64:
      Movq(dst.gp(), src.fp());
      return true;
    case kExprF32SConvertI32:
      Cvtlsi2ss(dst.fp(), src.gp());
      return true;
    case kExprF32UConvertI32:
      movl(kScratchRegister, src.gp());
      Cvtqsi2ss(dst.fp(), kScratchRegister);
      return true;
    case kExprF32SConvertI64:
      Cvtqsi2ss(dst.fp(), src.gp());
      return true;
    case kExprF32UConvertI64:
      Cvtqui2ss(dst.fp(), src.gp());
      return true;
    case kExprF32ConvertF64:
      Cvtsd2ss(dst.fp(), src.fp());
      return true;
    case kExprF32ReinterpretI32:
      Movd(dst.fp(), src.gp());
      return true;
    case kExprF64SConvertI32:
      Cvtlsi2sd(dst.fp(), src.gp());
      return true;
    case kExprF64UConvertI32:
      movl(kScratchRegister, src.gp());
      Cvtqsi2sd(dst.fp(), kScratchRegister);
      return true;
    case kExprF64SConvertI64:
      Cvtqsi2sd(dst.fp(), src.gp());
      return true;
    case kExprF64UConvertI64:
      Cvtqui2sd(dst.fp(), src.gp());
      return true;
    case kExprF64ConvertF32:
      Cvtss2sd(dst.fp(), src.fp());
      return true;
    case kExprF64ReinterpretI64:
      Movq(dst.fp(), src.gp());
      return true;
    default:
      UNREACHABLE();
  }
}

void LiftoffAssembler::emit_i32_signextend_i8(Register dst, Register src) {
  movsxbl(dst, src);
}

void LiftoffAssembler::emit_i32_signextend_i16(Register dst, Register src) {
  movsxwl(dst, src);
}

void LiftoffAssembler::emit_i64_signextend_i8(LiftoffRegister dst,
                                              LiftoffRegister src) {
  movsxbq(dst.gp(), src.gp());
}

void LiftoffAssembler::emit_i64_signextend_i16(LiftoffRegister dst,
                                               LiftoffRegister src) {
  movsxwq(dst.gp(), src.gp());
}

void LiftoffAssembler::emit_i64_signextend_i32(LiftoffRegister dst,
                                               LiftoffRegister src) {
  movsxlq(dst.gp(), src.gp());
}

void LiftoffAssembler::emit_jump(Label* label) { jmp(label); }

void LiftoffAssembler::emit_jump(Register target) { jmp(target); }

void LiftoffAssembler::emit_cond_jump(Condition cond, Label* label,
                                      ValueType type, Register lhs,
                                      Register rhs) {
  if (rhs != no_reg) {
    switch (type.kind()) {
      case ValueType::kI32:
        cmpl(lhs, rhs);
        break;
      case ValueType::kI64:
        cmpq(lhs, rhs);
        break;
      default:
        UNREACHABLE();
    }
  } else {
    DCHECK_EQ(type, kWasmI32);
    testl(lhs, lhs);
  }

  j(cond, label);
}

void LiftoffAssembler::emit_i32_eqz(Register dst, Register src) {
  testl(src, src);
  setcc(equal, dst);
  movzxbl(dst, dst);
}

void LiftoffAssembler::emit_i32_set_cond(Condition cond, Register dst,
                                         Register lhs, Register rhs) {
  cmpl(lhs, rhs);
  setcc(cond, dst);
  movzxbl(dst, dst);
}

void LiftoffAssembler::emit_i64_eqz(Register dst, LiftoffRegister src) {
  testq(src.gp(), src.gp());
  setcc(equal, dst);
  movzxbl(dst, dst);
}

void LiftoffAssembler::emit_i64_set_cond(Condition cond, Register dst,
                                         LiftoffRegister lhs,
                                         LiftoffRegister rhs) {
  cmpq(lhs.gp(), rhs.gp());
  setcc(cond, dst);
  movzxbl(dst, dst);
}

namespace liftoff {
template <void (TurboAssembler::*cmp_op)(DoubleRegister, DoubleRegister)>
void EmitFloatSetCond(LiftoffAssembler* assm, Condition cond, Register dst,
                      DoubleRegister lhs, DoubleRegister rhs) {
  Label cont;
  Label not_nan;

  (assm->*cmp_op)(lhs, rhs);
  // If PF is one, one of the operands was NaN. This needs special handling.
  assm->j(parity_odd, &not_nan, Label::kNear);
  // Return 1 for f32.ne, 0 for all other cases.
  if (cond == not_equal) {
    assm->movl(dst, Immediate(1));
  } else {
    assm->xorl(dst, dst);
  }
  assm->jmp(&cont, Label::kNear);
  assm->bind(&not_nan);

  assm->setcc(cond, dst);
  assm->movzxbl(dst, dst);
  assm->bind(&cont);
}
}  // namespace liftoff

void LiftoffAssembler::emit_f32_set_cond(Condition cond, Register dst,
                                         DoubleRegister lhs,
                                         DoubleRegister rhs) {
  liftoff::EmitFloatSetCond<&TurboAssembler::Ucomiss>(this, cond, dst, lhs,
                                                      rhs);
}

void LiftoffAssembler::emit_f64_set_cond(Condition cond, Register dst,
                                         DoubleRegister lhs,
                                         DoubleRegister rhs) {
  liftoff::EmitFloatSetCond<&TurboAssembler::Ucomisd>(this, cond, dst, lhs,
                                                      rhs);
}

bool LiftoffAssembler::emit_select(LiftoffRegister dst, Register condition,
                                   LiftoffRegister true_value,
                                   LiftoffRegister false_value,
                                   ValueType type) {
  if (type != kWasmI32 && type != kWasmI64) return false;

  testl(condition, condition);

  if (type == kWasmI32) {
    if (dst == false_value) {
      cmovl(not_zero, dst.gp(), true_value.gp());
    } else {
      if (dst != true_value) movl(dst.gp(), true_value.gp());
      cmovl(zero, dst.gp(), false_value.gp());
    }
  } else {
    if (dst == false_value) {
      cmovq(not_zero, dst.gp(), true_value.gp());
    } else {
      if (dst != true_value) movq(dst.gp(), true_value.gp());
      cmovq(zero, dst.gp(), false_value.gp());
    }
  }

  return true;
}

// TODO(fanchenk): Distinguish mov* if data bypass delay matter.
namespace liftoff {
template <void (Assembler::*avx_op)(XMMRegister, XMMRegister, XMMRegister),
          void (Assembler::*sse_op)(XMMRegister, XMMRegister)>
void EmitSimdCommutativeBinOp(
    LiftoffAssembler* assm, LiftoffRegister dst, LiftoffRegister lhs,
    LiftoffRegister rhs, base::Optional<CpuFeature> feature = base::nullopt) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(assm, AVX);
    (assm->*avx_op)(dst.fp(), lhs.fp(), rhs.fp());
    return;
  }

  base::Optional<CpuFeatureScope> sse_scope;
  if (feature.has_value()) sse_scope.emplace(assm, *feature);

  if (dst.fp() == rhs.fp()) {
    (assm->*sse_op)(dst.fp(), lhs.fp());
  } else {
    if (dst.fp() != lhs.fp()) (assm->movaps)(dst.fp(), lhs.fp());
    (assm->*sse_op)(dst.fp(), rhs.fp());
  }
}

template <void (Assembler::*avx_op)(XMMRegister, XMMRegister, XMMRegister),
          void (Assembler::*sse_op)(XMMRegister, XMMRegister)>
void EmitSimdNonCommutativeBinOp(
    LiftoffAssembler* assm, LiftoffRegister dst, LiftoffRegister lhs,
    LiftoffRegister rhs, base::Optional<CpuFeature> feature = base::nullopt) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(assm, AVX);
    (assm->*avx_op)(dst.fp(), lhs.fp(), rhs.fp());
    return;
  }

  base::Optional<CpuFeatureScope> sse_scope;
  if (feature.has_value()) sse_scope.emplace(assm, *feature);

  if (dst.fp() == rhs.fp()) {
    assm->movaps(kScratchDoubleReg, rhs.fp());
    assm->movaps(dst.fp(), lhs.fp());
    (assm->*sse_op)(dst.fp(), kScratchDoubleReg);
  } else {
    if (dst.fp() != lhs.fp()) assm->movaps(dst.fp(), lhs.fp());
    (assm->*sse_op)(dst.fp(), rhs.fp());
  }
}

template <void (Assembler::*avx_op)(XMMRegister, XMMRegister, XMMRegister),
          void (Assembler::*sse_op)(XMMRegister, XMMRegister), uint8_t width>
void EmitSimdShiftOp(LiftoffAssembler* assm, LiftoffRegister dst,
                     LiftoffRegister operand, LiftoffRegister count) {
  constexpr int mask = (1 << width) - 1;
  assm->movq(kScratchRegister, count.gp());
  assm->andq(kScratchRegister, Immediate(mask));
  assm->Movq(kScratchDoubleReg, kScratchRegister);
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(assm, AVX);
    (assm->*avx_op)(dst.fp(), operand.fp(), kScratchDoubleReg);
  } else {
    if (dst.fp() != operand.fp()) assm->movaps(dst.fp(), operand.fp());
    (assm->*sse_op)(dst.fp(), kScratchDoubleReg);
  }
}

template <void (Assembler::*avx_op)(XMMRegister, XMMRegister, byte),
          void (Assembler::*sse_op)(XMMRegister, byte), uint8_t width>
void EmitSimdShiftOpImm(LiftoffAssembler* assm, LiftoffRegister dst,
                        LiftoffRegister operand, int32_t count) {
  constexpr int mask = (1 << width) - 1;
  byte shift = static_cast<byte>(count & mask);
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(assm, AVX);
    (assm->*avx_op)(dst.fp(), operand.fp(), shift);
  } else {
    if (dst.fp() != operand.fp()) assm->movaps(dst.fp(), operand.fp());
    (assm->*sse_op)(dst.fp(), shift);
  }
}

template <bool is_signed>
void EmitI8x16Shr(LiftoffAssembler* assm, LiftoffRegister dst,
                  LiftoffRegister lhs, LiftoffRegister rhs) {
  // Same algorithm as the one in code-generator-x64.cc.
  assm->Punpckhbw(kScratchDoubleReg, lhs.fp());
  assm->Punpcklbw(dst.fp(), lhs.fp());
  // Prepare shift value
  assm->movq(kScratchRegister, rhs.gp());
  // Take shift value modulo 8.
  assm->andq(kScratchRegister, Immediate(7));
  assm->addq(kScratchRegister, Immediate(8));
  assm->Movq(liftoff::kScratchDoubleReg2, kScratchRegister);
  if (is_signed) {
    assm->Psraw(kScratchDoubleReg, liftoff::kScratchDoubleReg2);
    assm->Psraw(dst.fp(), liftoff::kScratchDoubleReg2);
    assm->Packsswb(dst.fp(), kScratchDoubleReg);
  } else {
    assm->Psrlw(kScratchDoubleReg, liftoff::kScratchDoubleReg2);
    assm->Psrlw(dst.fp(), liftoff::kScratchDoubleReg2);
    assm->Packuswb(dst.fp(), kScratchDoubleReg);
  }
}

// Can be used by both the immediate and register version of the shifts. psraq
// is only available in AVX512, so we can't use it yet.
template <typename ShiftOperand>
void EmitI64x2ShrS(LiftoffAssembler* assm, LiftoffRegister dst,
                   LiftoffRegister lhs, ShiftOperand rhs,
                   bool shift_is_rcx = false) {
  bool restore_rcx = false;
  Register backup = kScratchRegister2;
  if (!shift_is_rcx) {
    if (assm->cache_state()->is_used(LiftoffRegister(rcx))) {
      restore_rcx = true;
      assm->movq(backup, rcx);
    }
    assm->movl(rcx, rhs);
  }

  Register tmp = kScratchRegister;

  assm->Pextrq(tmp, lhs.fp(), int8_t{0x0});
  assm->sarq_cl(tmp);
  assm->Pinsrq(dst.fp(), tmp, uint8_t{0x0});

  assm->Pextrq(tmp, lhs.fp(), int8_t{0x1});
  assm->sarq_cl(tmp);
  assm->Pinsrq(dst.fp(), tmp, uint8_t{0x1});

  // restore rcx.
  if (restore_rcx) {
    assm->movq(rcx, backup);
  }
}

inline void EmitAnyTrue(LiftoffAssembler* assm, LiftoffRegister dst,
                        LiftoffRegister src) {
  assm->xorq(dst.gp(), dst.gp());
  assm->Ptest(src.fp(), src.fp());
  assm->setcc(not_equal, dst.gp());
}

template <void (TurboAssembler::*pcmp)(XMMRegister, XMMRegister)>
inline void EmitAllTrue(LiftoffAssembler* assm, LiftoffRegister dst,
                        LiftoffRegister src) {
  XMMRegister tmp = kScratchDoubleReg;
  assm->xorq(dst.gp(), dst.gp());
  assm->Pxor(tmp, tmp);
  (assm->*pcmp)(tmp, src.fp());
  assm->Ptest(tmp, tmp);
  assm->setcc(equal, dst.gp());
}

}  // namespace liftoff

void LiftoffAssembler::LoadTransform(LiftoffRegister dst, Register src_addr,
                                     Register offset_reg, uint32_t offset_imm,
                                     LoadType type,
                                     LoadTransformationKind transform,
                                     uint32_t* protected_load_pc) {
  if (emit_debug_code() && offset_reg != no_reg) {
    AssertZeroExtended(offset_reg);
  }
  Operand src_op = liftoff::GetMemOp(this, src_addr, offset_reg, offset_imm);
  *protected_load_pc = pc_offset();
  MachineType memtype = type.mem_type();
  if (transform == LoadTransformationKind::kExtend) {
    if (memtype == MachineType::Int8()) {
      Pmovsxbw(dst.fp(), src_op);
    } else if (memtype == MachineType::Uint8()) {
      Pmovzxbw(dst.fp(), src_op);
    } else if (memtype == MachineType::Int16()) {
      Pmovsxwd(dst.fp(), src_op);
    } else if (memtype == MachineType::Uint16()) {
      Pmovzxwd(dst.fp(), src_op);
    } else if (memtype == MachineType::Int32()) {
      Pmovsxdq(dst.fp(), src_op);
    } else if (memtype == MachineType::Uint32()) {
      Pmovzxdq(dst.fp(), src_op);
    }
  } else if (transform == LoadTransformationKind::kZeroExtend) {
    if (memtype == MachineType::Int32()) {
      Movss(dst.fp(), src_op);
    } else {
      DCHECK_EQ(MachineType::Int64(), memtype);
      Movsd(dst.fp(), src_op);
    }
  } else {
    DCHECK_EQ(LoadTransformationKind::kSplat, transform);
    if (memtype == MachineType::Int8()) {
      Pinsrb(dst.fp(), dst.fp(), src_op, 0);
      Pxor(kScratchDoubleReg, kScratchDoubleReg);
      Pshufb(dst.fp(), kScratchDoubleReg);
    } else if (memtype == MachineType::Int16()) {
      Pinsrw(dst.fp(), dst.fp(), src_op, 0);
      Pshuflw(dst.fp(), dst.fp(), uint8_t{0});
      Punpcklqdq(dst.fp(), dst.fp());
    } else if (memtype == MachineType::Int32()) {
      if (CpuFeatures::IsSupported(AVX)) {
        CpuFeatureScope avx_scope(this, AVX);
        vbroadcastss(dst.fp(), src_op);
      } else {
        movss(dst.fp(), src_op);
        shufps(dst.fp(), dst.fp(), byte{0});
      }
    } else if (memtype == MachineType::Int64()) {
      Movddup(dst.fp(), src_op);
    }
  }
}

void LiftoffAssembler::emit_i8x16_shuffle(LiftoffRegister dst,
                                          LiftoffRegister lhs,
                                          LiftoffRegister rhs,
                                          const uint8_t shuffle[16],
                                          bool is_swizzle) {
  if (is_swizzle) {
    uint32_t imms[4];
    // Shuffles that use just 1 operand are called swizzles, rhs can be ignored.
    wasm::SimdShuffle::Pack16Lanes(imms, shuffle);
    TurboAssembler::Move(kScratchDoubleReg, make_uint64(imms[3], imms[2]),
                         make_uint64(imms[1], imms[0]));
    Pshufb(dst.fp(), lhs.fp(), kScratchDoubleReg);
    return;
  }

  uint64_t mask1[2] = {};
  for (int i = 15; i >= 0; i--) {
    uint8_t lane = shuffle[i];
    int j = i >> 3;
    mask1[j] <<= 8;
    mask1[j] |= lane < kSimd128Size ? lane : 0x80;
  }
  TurboAssembler::Move(liftoff::kScratchDoubleReg2, mask1[1], mask1[0]);
  Pshufb(kScratchDoubleReg, lhs.fp(), liftoff::kScratchDoubleReg2);

  uint64_t mask2[2] = {};
  for (int i = 15; i >= 0; i--) {
    uint8_t lane = shuffle[i];
    int j = i >> 3;
    mask2[j] <<= 8;
    mask2[j] |= lane >= kSimd128Size ? (lane & 0x0F) : 0x80;
  }
  TurboAssembler::Move(liftoff::kScratchDoubleReg2, mask2[1], mask2[0]);

  Pshufb(dst.fp(), rhs.fp(), liftoff::kScratchDoubleReg2);
  Por(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i8x16_swizzle(LiftoffRegister dst,
                                          LiftoffRegister lhs,
                                          LiftoffRegister rhs) {
  XMMRegister mask = kScratchDoubleReg;
  // Out-of-range indices should return 0, add 112 (0x70) so that any value > 15
  // saturates to 128 (top bit set), so pshufb will zero that lane.
  TurboAssembler::Move(mask, uint32_t{0x70707070});
  Pshufd(mask, mask, uint8_t{0x0});
  Paddusb(mask, rhs.fp());
  Pshufb(dst.fp(), lhs.fp(), mask);
}

void LiftoffAssembler::emit_i8x16_splat(LiftoffRegister dst,
                                        LiftoffRegister src) {
  Movd(dst.fp(), src.gp());
  Pxor(kScratchDoubleReg, kScratchDoubleReg);
  Pshufb(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i16x8_splat(LiftoffRegister dst,
                                        LiftoffRegister src) {
  Movd(dst.fp(), src.gp());
  Pshuflw(dst.fp(), dst.fp(), static_cast<uint8_t>(0));
  Pshufd(dst.fp(), dst.fp(), static_cast<uint8_t>(0));
}

void LiftoffAssembler::emit_i32x4_splat(LiftoffRegister dst,
                                        LiftoffRegister src) {
  Movd(dst.fp(), src.gp());
  Pshufd(dst.fp(), dst.fp(), static_cast<uint8_t>(0));
}

void LiftoffAssembler::emit_i64x2_splat(LiftoffRegister dst,
                                        LiftoffRegister src) {
  Movq(dst.fp(), src.gp());
  Movddup(dst.fp(), dst.fp());
}

void LiftoffAssembler::emit_f32x4_splat(LiftoffRegister dst,
                                        LiftoffRegister src) {
  Shufps(dst.fp(), src.fp(), 0);
}

void LiftoffAssembler::emit_f64x2_splat(LiftoffRegister dst,
                                        LiftoffRegister src) {
  Movddup(dst.fp(), src.fp());
}

void LiftoffAssembler::emit_i8x16_eq(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpcmpeqb, &Assembler::pcmpeqb>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_ne(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpcmpeqb, &Assembler::pcmpeqb>(
      this, dst, lhs, rhs);
  Pcmpeqb(kScratchDoubleReg, kScratchDoubleReg);
  Pxor(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i8x16_gt_s(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpcmpgtb,
                                       &Assembler::pcmpgtb>(this, dst, lhs,
                                                            rhs);
}

void LiftoffAssembler::emit_i8x16_gt_u(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  DoubleRegister ref = rhs.fp();
  if (dst == rhs) {
    Movaps(kScratchDoubleReg, rhs.fp());
    ref = kScratchDoubleReg;
  }
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaxub, &Assembler::pmaxub>(
      this, dst, lhs, rhs, SSE4_1);
  Pcmpeqb(dst.fp(), ref);
  Pcmpeqb(kScratchDoubleReg, kScratchDoubleReg);
  Pxor(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i8x16_ge_s(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  DoubleRegister ref = rhs.fp();
  if (dst == rhs) {
    Movaps(kScratchDoubleReg, rhs.fp());
    ref = kScratchDoubleReg;
  }
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminsb, &Assembler::pminsb>(
      this, dst, lhs, rhs, SSE4_1);
  Pcmpeqb(dst.fp(), ref);
}

void LiftoffAssembler::emit_i8x16_ge_u(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  DoubleRegister ref = rhs.fp();
  if (dst == rhs) {
    Movaps(kScratchDoubleReg, rhs.fp());
    ref = kScratchDoubleReg;
  }
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminub, &Assembler::pminub>(
      this, dst, lhs, rhs);
  Pcmpeqb(dst.fp(), ref);
}

void LiftoffAssembler::emit_i16x8_eq(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpcmpeqw, &Assembler::pcmpeqw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_ne(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpcmpeqw, &Assembler::pcmpeqw>(
      this, dst, lhs, rhs);
  Pcmpeqw(kScratchDoubleReg, kScratchDoubleReg);
  Pxor(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i16x8_gt_s(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpcmpgtw,
                                       &Assembler::pcmpgtw>(this, dst, lhs,
                                                            rhs);
}

void LiftoffAssembler::emit_i16x8_gt_u(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  DoubleRegister ref = rhs.fp();
  if (dst == rhs) {
    Movaps(kScratchDoubleReg, rhs.fp());
    ref = kScratchDoubleReg;
  }
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaxuw, &Assembler::pmaxuw>(
      this, dst, lhs, rhs);
  Pcmpeqw(dst.fp(), ref);
  Pcmpeqw(kScratchDoubleReg, kScratchDoubleReg);
  Pxor(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i16x8_ge_s(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  DoubleRegister ref = rhs.fp();
  if (dst == rhs) {
    Movaps(kScratchDoubleReg, rhs.fp());
    ref = kScratchDoubleReg;
  }
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminsw, &Assembler::pminsw>(
      this, dst, lhs, rhs);
  Pcmpeqw(dst.fp(), ref);
}

void LiftoffAssembler::emit_i16x8_ge_u(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  DoubleRegister ref = rhs.fp();
  if (dst == rhs) {
    Movaps(kScratchDoubleReg, rhs.fp());
    ref = kScratchDoubleReg;
  }
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminuw, &Assembler::pminuw>(
      this, dst, lhs, rhs, SSE4_1);
  Pcmpeqw(dst.fp(), ref);
}

void LiftoffAssembler::emit_i32x4_eq(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpcmpeqd, &Assembler::pcmpeqd>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i32x4_ne(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpcmpeqd, &Assembler::pcmpeqd>(
      this, dst, lhs, rhs);
  Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
  Pxor(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i32x4_gt_s(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpcmpgtd,
                                       &Assembler::pcmpgtd>(this, dst, lhs,
                                                            rhs);
}

void LiftoffAssembler::emit_i32x4_gt_u(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  DoubleRegister ref = rhs.fp();
  if (dst == rhs) {
    Movaps(kScratchDoubleReg, rhs.fp());
    ref = kScratchDoubleReg;
  }
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaxud, &Assembler::pmaxud>(
      this, dst, lhs, rhs, SSE4_1);
  Pcmpeqd(dst.fp(), ref);
  Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
  Pxor(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i32x4_ge_s(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  DoubleRegister ref = rhs.fp();
  if (dst == rhs) {
    Movaps(kScratchDoubleReg, rhs.fp());
    ref = kScratchDoubleReg;
  }
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminsd, &Assembler::pminsd>(
      this, dst, lhs, rhs, SSE4_1);
  Pcmpeqd(dst.fp(), ref);
}

void LiftoffAssembler::emit_i32x4_ge_u(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  DoubleRegister ref = rhs.fp();
  if (dst == rhs) {
    Movaps(kScratchDoubleReg, rhs.fp());
    ref = kScratchDoubleReg;
  }
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminud, &Assembler::pminud>(
      this, dst, lhs, rhs, SSE4_1);
  Pcmpeqd(dst.fp(), ref);
}

void LiftoffAssembler::emit_f32x4_eq(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vcmpeqps, &Assembler::cmpeqps>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f32x4_ne(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vcmpneqps,
                                    &Assembler::cmpneqps>(this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f32x4_lt(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vcmpltps,
                                       &Assembler::cmpltps>(this, dst, lhs,
                                                            rhs);
}

void LiftoffAssembler::emit_f32x4_le(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vcmpleps,
                                       &Assembler::cmpleps>(this, dst, lhs,
                                                            rhs);
}

void LiftoffAssembler::emit_f64x2_eq(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vcmpeqpd, &Assembler::cmpeqpd>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f64x2_ne(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vcmpneqpd,
                                    &Assembler::cmpneqpd>(this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f64x2_lt(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vcmpltpd,
                                       &Assembler::cmpltpd>(this, dst, lhs,
                                                            rhs);
}

void LiftoffAssembler::emit_f64x2_le(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vcmplepd,
                                       &Assembler::cmplepd>(this, dst, lhs,
                                                            rhs);
}

void LiftoffAssembler::emit_s128_const(LiftoffRegister dst,
                                       const uint8_t imms[16]) {
  uint64_t vals[2];
  memcpy(vals, imms, sizeof(vals));
  TurboAssembler::Move(dst.fp(), vals[0]);
  movq(kScratchRegister, vals[1]);
  Pinsrq(dst.fp(), kScratchRegister, uint8_t{1});
}

void LiftoffAssembler::emit_s128_not(LiftoffRegister dst, LiftoffRegister src) {
  if (dst.fp() != src.fp()) {
    Pcmpeqd(dst.fp(), dst.fp());
    Pxor(dst.fp(), src.fp());
  } else {
    Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
    Pxor(dst.fp(), kScratchDoubleReg);
  }
}

void LiftoffAssembler::emit_s128_and(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpand, &Assembler::pand>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_s128_or(LiftoffRegister dst, LiftoffRegister lhs,
                                    LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpor, &Assembler::por>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_s128_xor(LiftoffRegister dst, LiftoffRegister lhs,
                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpxor, &Assembler::pxor>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_s128_select(LiftoffRegister dst,
                                        LiftoffRegister src1,
                                        LiftoffRegister src2,
                                        LiftoffRegister mask) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vxorps(kScratchDoubleReg, src1.fp(), src2.fp());
    vandps(kScratchDoubleReg, kScratchDoubleReg, mask.fp());
    vxorps(dst.fp(), kScratchDoubleReg, src2.fp());
  } else {
    movaps(kScratchDoubleReg, src1.fp());
    xorps(kScratchDoubleReg, src2.fp());
    andps(kScratchDoubleReg, mask.fp());
    if (dst.fp() != src2.fp()) movaps(dst.fp(), src2.fp());
    xorps(dst.fp(), kScratchDoubleReg);
  }
}

void LiftoffAssembler::emit_i8x16_neg(LiftoffRegister dst,
                                      LiftoffRegister src) {
  if (dst.fp() == src.fp()) {
    Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
    Psignb(dst.fp(), kScratchDoubleReg);
  } else {
    Pxor(dst.fp(), dst.fp());
    Psubb(dst.fp(), src.fp());
  }
}

void LiftoffAssembler::emit_v8x16_anytrue(LiftoffRegister dst,
                                          LiftoffRegister src) {
  liftoff::EmitAnyTrue(this, dst, src);
}

void LiftoffAssembler::emit_v8x16_alltrue(LiftoffRegister dst,
                                          LiftoffRegister src) {
  liftoff::EmitAllTrue<&TurboAssembler::Pcmpeqb>(this, dst, src);
}

void LiftoffAssembler::emit_i8x16_bitmask(LiftoffRegister dst,
                                          LiftoffRegister src) {
  Pmovmskb(dst.gp(), src.fp());
}

void LiftoffAssembler::emit_i8x16_shl(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  static constexpr RegClass tmp_simd_rc = reg_class_for(ValueType::kS128);
  LiftoffRegister tmp_simd =
      GetUnusedRegister(tmp_simd_rc, LiftoffRegList::ForRegs(dst, lhs));
  // Mask off the unwanted bits before word-shifting.
  Pcmpeqw(kScratchDoubleReg, kScratchDoubleReg);
  movq(kScratchRegister, rhs.gp());
  andq(kScratchRegister, Immediate(7));
  addq(kScratchRegister, Immediate(8));
  Movq(tmp_simd.fp(), kScratchRegister);
  Psrlw(kScratchDoubleReg, tmp_simd.fp());
  Packuswb(kScratchDoubleReg, kScratchDoubleReg);

  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpand(dst.fp(), lhs.fp(), kScratchDoubleReg);
  } else {
    if (dst.fp() != lhs.fp()) movaps(dst.fp(), lhs.fp());
    pand(dst.fp(), kScratchDoubleReg);
  }
  subq(kScratchRegister, Immediate(8));
  Movq(tmp_simd.fp(), kScratchRegister);
  Psllw(dst.fp(), tmp_simd.fp());
}

void LiftoffAssembler::emit_i8x16_shli(LiftoffRegister dst, LiftoffRegister lhs,
                                       int32_t rhs) {
  byte shift = static_cast<byte>(rhs & 0x7);
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpsllw(dst.fp(), lhs.fp(), shift);
  } else {
    if (dst.fp() != lhs.fp()) movaps(dst.fp(), lhs.fp());
    psllw(dst.fp(), shift);
  }

  uint8_t bmask = static_cast<uint8_t>(0xff << shift);
  uint32_t mask = bmask << 24 | bmask << 16 | bmask << 8 | bmask;
  movl(kScratchRegister, Immediate(mask));
  Movd(kScratchDoubleReg, kScratchRegister);
  Pshufd(kScratchDoubleReg, kScratchDoubleReg, uint8_t{0});
  Pand(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i8x16_shr_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitI8x16Shr</*is_signed=*/true>(this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_shri_s(LiftoffRegister dst,
                                         LiftoffRegister lhs, int32_t rhs) {
  Punpckhbw(kScratchDoubleReg, lhs.fp());
  Punpcklbw(dst.fp(), lhs.fp());
  uint8_t shift = (rhs & 7) + 8;
  Psraw(kScratchDoubleReg, shift);
  Psraw(dst.fp(), shift);
  Packsswb(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i8x16_shr_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitI8x16Shr</*is_signed=*/false>(this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_shri_u(LiftoffRegister dst,
                                         LiftoffRegister lhs, int32_t rhs) {
  // Perform 16-bit shift, then mask away high bits.
  uint8_t shift = rhs & 7;  // i.InputInt3(1);
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpsrlw(dst.fp(), lhs.fp(), byte{shift});
  } else if (dst != lhs) {
    Movaps(dst.fp(), lhs.fp());
    psrlw(dst.fp(), byte{shift});
  }

  uint8_t bmask = 0xff >> shift;
  uint32_t mask = bmask << 24 | bmask << 16 | bmask << 8 | bmask;
  movl(kScratchRegister, Immediate(mask));
  Movd(kScratchDoubleReg, kScratchRegister);
  Pshufd(kScratchDoubleReg, kScratchDoubleReg, byte{0});
  Pand(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i8x16_add(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpaddb, &Assembler::paddb>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_add_sat_s(LiftoffRegister dst,
                                            LiftoffRegister lhs,
                                            LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpaddsb, &Assembler::paddsb>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_add_sat_u(LiftoffRegister dst,
                                            LiftoffRegister lhs,
                                            LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpaddusb, &Assembler::paddusb>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_sub(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpsubb, &Assembler::psubb>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_sub_sat_s(LiftoffRegister dst,
                                            LiftoffRegister lhs,
                                            LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpsubsb, &Assembler::psubsb>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_sub_sat_u(LiftoffRegister dst,
                                            LiftoffRegister lhs,
                                            LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpsubusb,
                                       &Assembler::psubusb>(this, dst, lhs,
                                                            rhs);
}

void LiftoffAssembler::emit_i8x16_mul(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  static constexpr RegClass tmp_rc = reg_class_for(ValueType::kS128);
  LiftoffRegister tmp =
      GetUnusedRegister(tmp_rc, LiftoffRegList::ForRegs(dst, lhs, rhs));
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    // I16x8 view of I8x16
    // left = AAaa AAaa ... AAaa AAaa
    // right= BBbb BBbb ... BBbb BBbb
    // t = 00AA 00AA ... 00AA 00AA
    // s = 00BB 00BB ... 00BB 00BB
    vpsrlw(tmp.fp(), lhs.fp(), 8);
    vpsrlw(kScratchDoubleReg, rhs.fp(), 8);
    // t = I16x8Mul(t0, t1)
    //    => __PP __PP ...  __PP  __PP
    vpmullw(tmp.fp(), tmp.fp(), kScratchDoubleReg);
    // s = left * 256
    vpsllw(kScratchDoubleReg, lhs.fp(), 8);
    // dst = I16x8Mul(left * 256, right)
    //    => pp__ pp__ ...  pp__  pp__
    vpmullw(dst.fp(), kScratchDoubleReg, rhs.fp());
    // dst = I16x8Shr(dst, 8)
    //    => 00pp 00pp ...  00pp  00pp
    vpsrlw(dst.fp(), dst.fp(), 8);
    // t = I16x8Shl(t, 8)
    //    => PP00 PP00 ...  PP00  PP00
    vpsllw(tmp.fp(), tmp.fp(), 8);
    // dst = I16x8Or(dst, t)
    //    => PPpp PPpp ...  PPpp  PPpp
    vpor(dst.fp(), dst.fp(), tmp.fp());
  } else {
    if (dst.fp() != lhs.fp()) movaps(dst.fp(), lhs.fp());
    // I16x8 view of I8x16
    // left = AAaa AAaa ... AAaa AAaa
    // right= BBbb BBbb ... BBbb BBbb
    // t = 00AA 00AA ... 00AA 00AA
    // s = 00BB 00BB ... 00BB 00BB
    movaps(tmp.fp(), dst.fp());
    movaps(kScratchDoubleReg, rhs.fp());
    psrlw(tmp.fp(), 8);
    psrlw(kScratchDoubleReg, 8);
    // dst = left * 256
    psllw(dst.fp(), 8);
    // t = I16x8Mul(t, s)
    //    => __PP __PP ...  __PP  __PP
    pmullw(tmp.fp(), kScratchDoubleReg);
    // dst = I16x8Mul(left * 256, right)
    //    => pp__ pp__ ...  pp__  pp__
    pmullw(dst.fp(), rhs.fp());
    // t = I16x8Shl(t, 8)
    //    => PP00 PP00 ...  PP00  PP00
    psllw(tmp.fp(), 8);
    // dst = I16x8Shr(dst, 8)
    //    => 00pp 00pp ...  00pp  00pp
    psrlw(dst.fp(), 8);
    // dst = I16x8Or(dst, t)
    //    => PPpp PPpp ...  PPpp  PPpp
    por(dst.fp(), tmp.fp());
  }
}

void LiftoffAssembler::emit_i8x16_min_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminsb, &Assembler::pminsb>(
      this, dst, lhs, rhs, base::Optional<CpuFeature>(SSE4_1));
}

void LiftoffAssembler::emit_i8x16_min_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminub, &Assembler::pminub>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_max_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaxsb, &Assembler::pmaxsb>(
      this, dst, lhs, rhs, base::Optional<CpuFeature>(SSE4_1));
}

void LiftoffAssembler::emit_i8x16_max_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaxub, &Assembler::pmaxub>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_neg(LiftoffRegister dst,
                                      LiftoffRegister src) {
  if (dst.fp() == src.fp()) {
    Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
    Psignw(dst.fp(), kScratchDoubleReg);
  } else {
    Pxor(dst.fp(), dst.fp());
    Psubw(dst.fp(), src.fp());
  }
}

void LiftoffAssembler::emit_v16x8_anytrue(LiftoffRegister dst,
                                          LiftoffRegister src) {
  liftoff::EmitAnyTrue(this, dst, src);
}

void LiftoffAssembler::emit_v16x8_alltrue(LiftoffRegister dst,
                                          LiftoffRegister src) {
  liftoff::EmitAllTrue<&TurboAssembler::Pcmpeqw>(this, dst, src);
}

void LiftoffAssembler::emit_i16x8_bitmask(LiftoffRegister dst,
                                          LiftoffRegister src) {
  XMMRegister tmp = kScratchDoubleReg;
  Packsswb(tmp, src.fp());
  Pmovmskb(dst.gp(), tmp);
  shrq(dst.gp(), Immediate(8));
}

void LiftoffAssembler::emit_i16x8_shl(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdShiftOp<&Assembler::vpsllw, &Assembler::psllw, 4>(this, dst,
                                                                     lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_shli(LiftoffRegister dst, LiftoffRegister lhs,
                                       int32_t rhs) {
  liftoff::EmitSimdShiftOpImm<&Assembler::vpsllw, &Assembler::psllw, 4>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_shr_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdShiftOp<&Assembler::vpsraw, &Assembler::psraw, 4>(this, dst,
                                                                     lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_shri_s(LiftoffRegister dst,
                                         LiftoffRegister lhs, int32_t rhs) {
  liftoff::EmitSimdShiftOpImm<&Assembler::vpsraw, &Assembler::psraw, 4>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_shr_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdShiftOp<&Assembler::vpsrlw, &Assembler::psrlw, 4>(this, dst,
                                                                     lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_shri_u(LiftoffRegister dst,
                                         LiftoffRegister lhs, int32_t rhs) {
  liftoff::EmitSimdShiftOpImm<&Assembler::vpsrlw, &Assembler::psrlw, 4>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_add(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpaddw, &Assembler::paddw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_add_sat_s(LiftoffRegister dst,
                                            LiftoffRegister lhs,
                                            LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpaddsw, &Assembler::paddsw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_add_sat_u(LiftoffRegister dst,
                                            LiftoffRegister lhs,
                                            LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpaddusw, &Assembler::paddusw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_sub(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpsubw, &Assembler::psubw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_sub_sat_s(LiftoffRegister dst,
                                            LiftoffRegister lhs,
                                            LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpsubsw, &Assembler::psubsw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_sub_sat_u(LiftoffRegister dst,
                                            LiftoffRegister lhs,
                                            LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpsubusw,
                                       &Assembler::psubusw>(this, dst, lhs,
                                                            rhs);
}

void LiftoffAssembler::emit_i16x8_mul(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmullw, &Assembler::pmullw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_min_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminsw, &Assembler::pminsw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_min_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminuw, &Assembler::pminuw>(
      this, dst, lhs, rhs, base::Optional<CpuFeature>(SSE4_1));
}

void LiftoffAssembler::emit_i16x8_max_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaxsw, &Assembler::pmaxsw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_max_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaxuw, &Assembler::pmaxuw>(
      this, dst, lhs, rhs, base::Optional<CpuFeature>(SSE4_1));
}

void LiftoffAssembler::emit_i32x4_neg(LiftoffRegister dst,
                                      LiftoffRegister src) {
  if (dst.fp() == src.fp()) {
    Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
    Psignd(dst.fp(), kScratchDoubleReg);
  } else {
    Pxor(dst.fp(), dst.fp());
    Psubd(dst.fp(), src.fp());
  }
}

void LiftoffAssembler::emit_v32x4_anytrue(LiftoffRegister dst,
                                          LiftoffRegister src) {
  liftoff::EmitAnyTrue(this, dst, src);
}

void LiftoffAssembler::emit_v32x4_alltrue(LiftoffRegister dst,
                                          LiftoffRegister src) {
  liftoff::EmitAllTrue<&TurboAssembler::Pcmpeqd>(this, dst, src);
}

void LiftoffAssembler::emit_i32x4_bitmask(LiftoffRegister dst,
                                          LiftoffRegister src) {
  Movmskps(dst.gp(), src.fp());
}

void LiftoffAssembler::emit_i32x4_shl(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdShiftOp<&Assembler::vpslld, &Assembler::pslld, 5>(this, dst,
                                                                     lhs, rhs);
}

void LiftoffAssembler::emit_i32x4_shli(LiftoffRegister dst, LiftoffRegister lhs,
                                       int32_t rhs) {
  liftoff::EmitSimdShiftOpImm<&Assembler::vpslld, &Assembler::pslld, 5>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i32x4_shr_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdShiftOp<&Assembler::vpsrad, &Assembler::psrad, 5>(this, dst,
                                                                     lhs, rhs);
}

void LiftoffAssembler::emit_i32x4_shri_s(LiftoffRegister dst,
                                         LiftoffRegister lhs, int32_t rhs) {
  liftoff::EmitSimdShiftOpImm<&Assembler::vpsrad, &Assembler::psrad, 5>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i32x4_shr_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdShiftOp<&Assembler::vpsrld, &Assembler::psrld, 5>(this, dst,
                                                                     lhs, rhs);
}

void LiftoffAssembler::emit_i32x4_shri_u(LiftoffRegister dst,
                                         LiftoffRegister lhs, int32_t rhs) {
  liftoff::EmitSimdShiftOpImm<&Assembler::vpsrld, &Assembler::psrld, 5>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i32x4_add(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpaddd, &Assembler::paddd>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i32x4_sub(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpsubd, &Assembler::psubd>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i32x4_mul(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmulld, &Assembler::pmulld>(
      this, dst, lhs, rhs, base::Optional<CpuFeature>(SSE4_1));
}

void LiftoffAssembler::emit_i32x4_min_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminsd, &Assembler::pminsd>(
      this, dst, lhs, rhs, base::Optional<CpuFeature>(SSE4_1));
}

void LiftoffAssembler::emit_i32x4_min_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpminud, &Assembler::pminud>(
      this, dst, lhs, rhs, base::Optional<CpuFeature>(SSE4_1));
}

void LiftoffAssembler::emit_i32x4_max_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaxsd, &Assembler::pmaxsd>(
      this, dst, lhs, rhs, base::Optional<CpuFeature>(SSE4_1));
}

void LiftoffAssembler::emit_i32x4_max_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaxud, &Assembler::pmaxud>(
      this, dst, lhs, rhs, base::Optional<CpuFeature>(SSE4_1));
}

void LiftoffAssembler::emit_i32x4_dot_i16x8_s(LiftoffRegister dst,
                                              LiftoffRegister lhs,
                                              LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmaddwd, &Assembler::pmaddwd>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i64x2_neg(LiftoffRegister dst,
                                      LiftoffRegister src) {
  DoubleRegister reg = dst.fp() == src.fp() ? kScratchDoubleReg : dst.fp();
  Pxor(reg, reg);
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpsubq(dst.fp(), reg, src.fp());
  } else {
    psubq(reg, src.fp());
    if (dst.fp() != reg) movapd(dst.fp(), reg);
  }
}

void LiftoffAssembler::emit_i64x2_shl(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdShiftOp<&Assembler::vpsllq, &Assembler::psllq, 6>(this, dst,
                                                                     lhs, rhs);
}

void LiftoffAssembler::emit_i64x2_shli(LiftoffRegister dst, LiftoffRegister lhs,
                                       int32_t rhs) {
  liftoff::EmitSimdShiftOpImm<&Assembler::vpsllq, &Assembler::psllq, 6>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i64x2_shr_s(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitI64x2ShrS(this, dst, lhs, rhs.gp(),
                         /*shift_is_rcx=*/rhs.gp() == rcx);
}

void LiftoffAssembler::emit_i64x2_shri_s(LiftoffRegister dst,
                                         LiftoffRegister lhs, int32_t rhs) {
  liftoff::EmitI64x2ShrS(this, dst, lhs, Immediate(rhs));
}

void LiftoffAssembler::emit_i64x2_shr_u(LiftoffRegister dst,
                                        LiftoffRegister lhs,
                                        LiftoffRegister rhs) {
  liftoff::EmitSimdShiftOp<&Assembler::vpsrlq, &Assembler::psrlq, 6>(this, dst,
                                                                     lhs, rhs);
}

void LiftoffAssembler::emit_i64x2_shri_u(LiftoffRegister dst,
                                         LiftoffRegister lhs, int32_t rhs) {
  liftoff::EmitSimdShiftOpImm<&Assembler::vpsrlq, &Assembler::psrlq, 6>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i64x2_add(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpaddq, &Assembler::paddq>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i64x2_sub(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpsubq, &Assembler::psubq>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i64x2_mul(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  static constexpr RegClass tmp_rc = reg_class_for(ValueType::kS128);
  LiftoffRegister tmp1 =
      GetUnusedRegister(tmp_rc, LiftoffRegList::ForRegs(dst, lhs, rhs));
  LiftoffRegister tmp2 =
      GetUnusedRegister(tmp_rc, LiftoffRegList::ForRegs(dst, lhs, rhs, tmp1));
  Movaps(tmp1.fp(), lhs.fp());
  Movaps(tmp2.fp(), rhs.fp());
  // Multiply high dword of each qword of left with right.
  Psrlq(tmp1.fp(), 32);
  Pmuludq(tmp1.fp(), rhs.fp());
  // Multiply high dword of each qword of right with left.
  Psrlq(tmp2.fp(), 32);
  Pmuludq(tmp2.fp(), lhs.fp());
  Paddq(tmp2.fp(), tmp1.fp());
  Psllq(tmp2.fp(), 32);
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpmuludq(dst.fp(), lhs.fp(), rhs.fp());
  } else {
    if (dst.fp() != lhs.fp()) movaps(dst.fp(), lhs.fp());
    pmuludq(dst.fp(), rhs.fp());
  }
  Paddq(dst.fp(), tmp2.fp());
}

void LiftoffAssembler::emit_f32x4_abs(LiftoffRegister dst,
                                      LiftoffRegister src) {
  if (dst.fp() == src.fp()) {
    Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
    Psrld(kScratchDoubleReg, static_cast<byte>(1));
    Andps(dst.fp(), kScratchDoubleReg);
  } else {
    Pcmpeqd(dst.fp(), dst.fp());
    Psrld(dst.fp(), static_cast<byte>(1));
    Andps(dst.fp(), src.fp());
  }
}

void LiftoffAssembler::emit_f32x4_neg(LiftoffRegister dst,
                                      LiftoffRegister src) {
  if (dst.fp() == src.fp()) {
    Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
    Pslld(kScratchDoubleReg, static_cast<byte>(31));
    Xorps(dst.fp(), kScratchDoubleReg);
  } else {
    Pcmpeqd(dst.fp(), dst.fp());
    Pslld(dst.fp(), static_cast<byte>(31));
    Xorps(dst.fp(), src.fp());
  }
}

void LiftoffAssembler::emit_f32x4_sqrt(LiftoffRegister dst,
                                       LiftoffRegister src) {
  Sqrtps(dst.fp(), src.fp());
}

bool LiftoffAssembler::emit_f32x4_ceil(LiftoffRegister dst,
                                       LiftoffRegister src) {
  DCHECK(CpuFeatures::IsSupported(SSE4_1));
  Roundps(dst.fp(), src.fp(), kRoundUp);
  return true;
}

bool LiftoffAssembler::emit_f32x4_floor(LiftoffRegister dst,
                                        LiftoffRegister src) {
  DCHECK(CpuFeatures::IsSupported(SSE4_1));
  Roundps(dst.fp(), src.fp(), kRoundDown);
  return true;
}

bool LiftoffAssembler::emit_f32x4_trunc(LiftoffRegister dst,
                                        LiftoffRegister src) {
  DCHECK(CpuFeatures::IsSupported(SSE4_1));
  Roundps(dst.fp(), src.fp(), kRoundToZero);
  return true;
}

bool LiftoffAssembler::emit_f32x4_nearest_int(LiftoffRegister dst,
                                              LiftoffRegister src) {
  DCHECK(CpuFeatures::IsSupported(SSE4_1));
  Roundps(dst.fp(), src.fp(), kRoundToNearest);
  return true;
}

void LiftoffAssembler::emit_f32x4_add(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vaddps, &Assembler::addps>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f32x4_sub(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vsubps, &Assembler::subps>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f32x4_mul(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vmulps, &Assembler::mulps>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f32x4_div(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vdivps, &Assembler::divps>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f32x4_min(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  // The minps instruction doesn't propagate NaNs and +0's in its first
  // operand. Perform minps in both orders, merge the results, and adjust.
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vminps(kScratchDoubleReg, lhs.fp(), rhs.fp());
    vminps(dst.fp(), rhs.fp(), lhs.fp());
  } else if (dst.fp() == lhs.fp() || dst.fp() == rhs.fp()) {
    XMMRegister src = dst.fp() == lhs.fp() ? rhs.fp() : lhs.fp();
    movaps(kScratchDoubleReg, src);
    minps(kScratchDoubleReg, dst.fp());
    minps(dst.fp(), src);
  } else {
    movaps(kScratchDoubleReg, lhs.fp());
    minps(kScratchDoubleReg, rhs.fp());
    movaps(dst.fp(), rhs.fp());
    minps(dst.fp(), lhs.fp());
  }
  // propagate -0's and NaNs, which may be non-canonical.
  Orps(kScratchDoubleReg, dst.fp());
  // Canonicalize NaNs by quieting and clearing the payload.
  Cmpps(dst.fp(), kScratchDoubleReg, int8_t{3});
  Orps(kScratchDoubleReg, dst.fp());
  Psrld(dst.fp(), byte{10});
  Andnps(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_f32x4_max(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  // The maxps instruction doesn't propagate NaNs and +0's in its first
  // operand. Perform maxps in both orders, merge the results, and adjust.
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vmaxps(kScratchDoubleReg, lhs.fp(), rhs.fp());
    vmaxps(dst.fp(), rhs.fp(), lhs.fp());
  } else if (dst.fp() == lhs.fp() || dst.fp() == rhs.fp()) {
    XMMRegister src = dst.fp() == lhs.fp() ? rhs.fp() : lhs.fp();
    movaps(kScratchDoubleReg, src);
    maxps(kScratchDoubleReg, dst.fp());
    maxps(dst.fp(), src);
  } else {
    movaps(kScratchDoubleReg, lhs.fp());
    maxps(kScratchDoubleReg, rhs.fp());
    movaps(dst.fp(), rhs.fp());
    maxps(dst.fp(), lhs.fp());
  }
  // Find discrepancies.
  Xorps(dst.fp(), kScratchDoubleReg);
  // Propagate NaNs, which may be non-canonical.
  Orps(kScratchDoubleReg, dst.fp());
  // Propagate sign discrepancy and (subtle) quiet NaNs.
  Subps(kScratchDoubleReg, dst.fp());
  // Canonicalize NaNs by clearing the payload. Sign is non-deterministic.
  Cmpps(dst.fp(), kScratchDoubleReg, int8_t{3});
  Psrld(dst.fp(), byte{10});
  Andnps(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_f32x4_pmin(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  // Due to the way minps works, pmin(a, b) = minps(b, a).
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vminps, &Assembler::minps>(
      this, dst, rhs, lhs);
}

void LiftoffAssembler::emit_f32x4_pmax(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  // Due to the way maxps works, pmax(a, b) = maxps(b, a).
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vmaxps, &Assembler::maxps>(
      this, dst, rhs, lhs);
}

void LiftoffAssembler::emit_f64x2_abs(LiftoffRegister dst,
                                      LiftoffRegister src) {
  if (dst.fp() == src.fp()) {
    Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
    Psrlq(kScratchDoubleReg, static_cast<byte>(1));
    Andpd(dst.fp(), kScratchDoubleReg);
  } else {
    Pcmpeqd(dst.fp(), dst.fp());
    Psrlq(dst.fp(), static_cast<byte>(1));
    Andpd(dst.fp(), src.fp());
  }
}

void LiftoffAssembler::emit_f64x2_neg(LiftoffRegister dst,
                                      LiftoffRegister src) {
  if (dst.fp() == src.fp()) {
    Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
    Psllq(kScratchDoubleReg, static_cast<byte>(63));
    Xorpd(dst.fp(), kScratchDoubleReg);
  } else {
    Pcmpeqd(dst.fp(), dst.fp());
    Psllq(dst.fp(), static_cast<byte>(63));
    Xorpd(dst.fp(), src.fp());
  }
}

void LiftoffAssembler::emit_f64x2_sqrt(LiftoffRegister dst,
                                       LiftoffRegister src) {
  Sqrtpd(dst.fp(), src.fp());
}

bool LiftoffAssembler::emit_f64x2_ceil(LiftoffRegister dst,
                                       LiftoffRegister src) {
  DCHECK(CpuFeatures::IsSupported(SSE4_1));
  Roundpd(dst.fp(), src.fp(), kRoundUp);
  return true;
}

bool LiftoffAssembler::emit_f64x2_floor(LiftoffRegister dst,
                                        LiftoffRegister src) {
  DCHECK(CpuFeatures::IsSupported(SSE4_1));
  Roundpd(dst.fp(), src.fp(), kRoundDown);
  return true;
}

bool LiftoffAssembler::emit_f64x2_trunc(LiftoffRegister dst,
                                        LiftoffRegister src) {
  DCHECK(CpuFeatures::IsSupported(SSE4_1));
  Roundpd(dst.fp(), src.fp(), kRoundToZero);
  return true;
}

bool LiftoffAssembler::emit_f64x2_nearest_int(LiftoffRegister dst,
                                              LiftoffRegister src) {
  DCHECK(CpuFeatures::IsSupported(SSE4_1));
  Roundpd(dst.fp(), src.fp(), kRoundToNearest);
  return true;
}

void LiftoffAssembler::emit_f64x2_add(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vaddpd, &Assembler::addpd>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f64x2_sub(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vsubpd, &Assembler::subpd>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f64x2_mul(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vmulpd, &Assembler::mulpd>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f64x2_div(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vdivpd, &Assembler::divpd>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_f64x2_min(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  // The minpd instruction doesn't propagate NaNs and +0's in its first
  // operand. Perform minpd in both orders, merge the results, and adjust.
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vminpd(kScratchDoubleReg, lhs.fp(), rhs.fp());
    vminpd(dst.fp(), rhs.fp(), lhs.fp());
  } else if (dst.fp() == lhs.fp() || dst.fp() == rhs.fp()) {
    XMMRegister src = dst.fp() == lhs.fp() ? rhs.fp() : lhs.fp();
    movapd(kScratchDoubleReg, src);
    minpd(kScratchDoubleReg, dst.fp());
    minpd(dst.fp(), src);
  } else {
    movapd(kScratchDoubleReg, lhs.fp());
    minpd(kScratchDoubleReg, rhs.fp());
    movapd(dst.fp(), rhs.fp());
    minpd(dst.fp(), lhs.fp());
  }
  // propagate -0's and NaNs, which may be non-canonical.
  Orpd(kScratchDoubleReg, dst.fp());
  // Canonicalize NaNs by quieting and clearing the payload.
  Cmppd(dst.fp(), kScratchDoubleReg, int8_t{3});
  Orpd(kScratchDoubleReg, dst.fp());
  Psrlq(dst.fp(), 13);
  Andnpd(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_f64x2_max(LiftoffRegister dst, LiftoffRegister lhs,
                                      LiftoffRegister rhs) {
  // The maxpd instruction doesn't propagate NaNs and +0's in its first
  // operand. Perform maxpd in both orders, merge the results, and adjust.
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vmaxpd(kScratchDoubleReg, lhs.fp(), rhs.fp());
    vmaxpd(dst.fp(), rhs.fp(), lhs.fp());
  } else if (dst.fp() == lhs.fp() || dst.fp() == rhs.fp()) {
    XMMRegister src = dst.fp() == lhs.fp() ? rhs.fp() : lhs.fp();
    movapd(kScratchDoubleReg, src);
    maxpd(kScratchDoubleReg, dst.fp());
    maxpd(dst.fp(), src);
  } else {
    movapd(kScratchDoubleReg, lhs.fp());
    maxpd(kScratchDoubleReg, rhs.fp());
    movapd(dst.fp(), rhs.fp());
    maxpd(dst.fp(), lhs.fp());
  }
  // Find discrepancies.
  Xorpd(dst.fp(), kScratchDoubleReg);
  // Propagate NaNs, which may be non-canonical.
  Orpd(kScratchDoubleReg, dst.fp());
  // Propagate sign discrepancy and (subtle) quiet NaNs.
  Subpd(kScratchDoubleReg, dst.fp());
  // Canonicalize NaNs by clearing the payload. Sign is non-deterministic.
  Cmppd(dst.fp(), kScratchDoubleReg, int8_t{3});
  Psrlq(dst.fp(), 13);
  Andnpd(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_f64x2_pmin(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  // Due to the way minpd works, pmin(a, b) = minpd(b, a).
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vminpd, &Assembler::minpd>(
      this, dst, rhs, lhs);
}

void LiftoffAssembler::emit_f64x2_pmax(LiftoffRegister dst, LiftoffRegister lhs,
                                       LiftoffRegister rhs) {
  // Due to the way maxpd works, pmax(a, b) = maxpd(b, a).
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vmaxpd, &Assembler::maxpd>(
      this, dst, rhs, lhs);
}

void LiftoffAssembler::emit_i32x4_sconvert_f32x4(LiftoffRegister dst,
                                                 LiftoffRegister src) {
  // NAN->0
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vcmpeqps(kScratchDoubleReg, src.fp(), src.fp());
    vpand(dst.fp(), src.fp(), kScratchDoubleReg);
  } else {
    movaps(kScratchDoubleReg, src.fp());
    cmpeqps(kScratchDoubleReg, kScratchDoubleReg);
    if (dst.fp() != src.fp()) movaps(dst.fp(), src.fp());
    pand(dst.fp(), kScratchDoubleReg);
  }
  // Set top bit if >= 0 (but not -0.0!).
  Pxor(kScratchDoubleReg, dst.fp());
  // Convert to int.
  Cvttps2dq(dst.fp(), dst.fp());
  // Set top bit if >=0 is now < 0.
  Pand(kScratchDoubleReg, dst.fp());
  Psrad(kScratchDoubleReg, byte{31});
  // Set positive overflow lanes to 0x7FFFFFFF.
  Pxor(dst.fp(), kScratchDoubleReg);
}

void LiftoffAssembler::emit_i32x4_uconvert_f32x4(LiftoffRegister dst,
                                                 LiftoffRegister src) {
  // NAN->0, negative->0.
  Pxor(kScratchDoubleReg, kScratchDoubleReg);
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vmaxps(dst.fp(), src.fp(), kScratchDoubleReg);
  } else {
    if (dst.fp() != src.fp()) movaps(dst.fp(), src.fp());
    maxps(dst.fp(), kScratchDoubleReg);
  }
  // scratch: float representation of max_signed.
  Pcmpeqd(kScratchDoubleReg, kScratchDoubleReg);
  Psrld(kScratchDoubleReg, uint8_t{1});            // 0x7fffffff
  Cvtdq2ps(kScratchDoubleReg, kScratchDoubleReg);  // 0x4f000000
  // scratch2: convert (src-max_signed).
  // Set positive overflow lanes to 0x7FFFFFFF.
  // Set negative lanes to 0.
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vsubps(liftoff::kScratchDoubleReg2, dst.fp(), kScratchDoubleReg);
  } else {
    movaps(liftoff::kScratchDoubleReg2, dst.fp());
    subps(liftoff::kScratchDoubleReg2, kScratchDoubleReg);
  }
  Cmpleps(kScratchDoubleReg, liftoff::kScratchDoubleReg2);
  Cvttps2dq(liftoff::kScratchDoubleReg2, liftoff::kScratchDoubleReg2);
  Pxor(liftoff::kScratchDoubleReg2, kScratchDoubleReg);
  Pxor(kScratchDoubleReg, kScratchDoubleReg);
  Pmaxsd(liftoff::kScratchDoubleReg2, kScratchDoubleReg);
  // Convert to int. Overflow lanes above max_signed will be 0x80000000.
  Cvttps2dq(dst.fp(), dst.fp());
  // Add (src-max_signed) for overflow lanes.
  Paddd(dst.fp(), liftoff::kScratchDoubleReg2);
}

void LiftoffAssembler::emit_f32x4_sconvert_i32x4(LiftoffRegister dst,
                                                 LiftoffRegister src) {
  Cvtdq2ps(dst.fp(), src.fp());
}

void LiftoffAssembler::emit_f32x4_uconvert_i32x4(LiftoffRegister dst,
                                                 LiftoffRegister src) {
  Pxor(kScratchDoubleReg, kScratchDoubleReg);           // Zeros.
  Pblendw(kScratchDoubleReg, src.fp(), uint8_t{0x55});  // Get lo 16 bits.
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpsubd(dst.fp(), src.fp(), kScratchDoubleReg);  // Get hi 16 bits.
  } else {
    if (dst.fp() != src.fp()) movaps(dst.fp(), src.fp());
    psubd(dst.fp(), kScratchDoubleReg);
  }
  Cvtdq2ps(kScratchDoubleReg, kScratchDoubleReg);  // Convert lo exactly.
  Psrld(dst.fp(), byte{1});            // Divide by 2 to get in unsigned range.
  Cvtdq2ps(dst.fp(), dst.fp());        // Convert hi, exactly.
  Addps(dst.fp(), dst.fp());           // Double hi, exactly.
  Addps(dst.fp(), kScratchDoubleReg);  // Add hi and lo, may round.
}

void LiftoffAssembler::emit_i8x16_sconvert_i16x8(LiftoffRegister dst,
                                                 LiftoffRegister lhs,
                                                 LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpacksswb,
                                       &Assembler::packsswb>(this, dst, lhs,
                                                             rhs);
}

void LiftoffAssembler::emit_i8x16_uconvert_i16x8(LiftoffRegister dst,
                                                 LiftoffRegister lhs,
                                                 LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpackuswb,
                                       &Assembler::packuswb>(this, dst, lhs,
                                                             rhs);
}

void LiftoffAssembler::emit_i16x8_sconvert_i32x4(LiftoffRegister dst,
                                                 LiftoffRegister lhs,
                                                 LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpackssdw,
                                       &Assembler::packssdw>(this, dst, lhs,
                                                             rhs);
}

void LiftoffAssembler::emit_i16x8_uconvert_i32x4(LiftoffRegister dst,
                                                 LiftoffRegister lhs,
                                                 LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vpackusdw,
                                       &Assembler::packusdw>(this, dst, lhs,
                                                             rhs, SSE4_1);
}

void LiftoffAssembler::emit_i16x8_sconvert_i8x16_low(LiftoffRegister dst,
                                                     LiftoffRegister src) {
  Pmovsxbw(dst.fp(), src.fp());
}

void LiftoffAssembler::emit_i16x8_sconvert_i8x16_high(LiftoffRegister dst,
                                                      LiftoffRegister src) {
  Palignr(dst.fp(), src.fp(), static_cast<uint8_t>(8));
  Pmovsxbw(dst.fp(), dst.fp());
}

void LiftoffAssembler::emit_i16x8_uconvert_i8x16_low(LiftoffRegister dst,
                                                     LiftoffRegister src) {
  Pmovzxbw(dst.fp(), src.fp());
}

void LiftoffAssembler::emit_i16x8_uconvert_i8x16_high(LiftoffRegister dst,
                                                      LiftoffRegister src) {
  Palignr(dst.fp(), src.fp(), static_cast<uint8_t>(8));
  Pmovzxbw(dst.fp(), dst.fp());
}

void LiftoffAssembler::emit_i32x4_sconvert_i16x8_low(LiftoffRegister dst,
                                                     LiftoffRegister src) {
  Pmovsxwd(dst.fp(), src.fp());
}

void LiftoffAssembler::emit_i32x4_sconvert_i16x8_high(LiftoffRegister dst,
                                                      LiftoffRegister src) {
  Palignr(dst.fp(), src.fp(), static_cast<uint8_t>(8));
  Pmovsxwd(dst.fp(), dst.fp());
}

void LiftoffAssembler::emit_i32x4_uconvert_i16x8_low(LiftoffRegister dst,
                                                     LiftoffRegister src) {
  Pmovzxwd(dst.fp(), src.fp());
}

void LiftoffAssembler::emit_i32x4_uconvert_i16x8_high(LiftoffRegister dst,
                                                      LiftoffRegister src) {
  Palignr(dst.fp(), src.fp(), static_cast<uint8_t>(8));
  Pmovzxwd(dst.fp(), dst.fp());
}

void LiftoffAssembler::emit_s128_and_not(LiftoffRegister dst,
                                         LiftoffRegister lhs,
                                         LiftoffRegister rhs) {
  liftoff::EmitSimdNonCommutativeBinOp<&Assembler::vandnps, &Assembler::andnps>(
      this, dst, rhs, lhs);
}

void LiftoffAssembler::emit_i8x16_rounding_average_u(LiftoffRegister dst,
                                                     LiftoffRegister lhs,
                                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpavgb, &Assembler::pavgb>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i16x8_rounding_average_u(LiftoffRegister dst,
                                                     LiftoffRegister lhs,
                                                     LiftoffRegister rhs) {
  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpavgw, &Assembler::pavgw>(
      this, dst, lhs, rhs);
}

void LiftoffAssembler::emit_i8x16_abs(LiftoffRegister dst,
                                      LiftoffRegister src) {
  Pabsb(dst.fp(), src.fp());
}

void LiftoffAssembler::emit_i16x8_abs(LiftoffRegister dst,
                                      LiftoffRegister src) {
  Pabsw(dst.fp(), src.fp());
}

void LiftoffAssembler::emit_i32x4_abs(LiftoffRegister dst,
                                      LiftoffRegister src) {
  Pabsd(dst.fp(), src.fp());
}

void LiftoffAssembler::emit_i8x16_extract_lane_s(LiftoffRegister dst,
                                                 LiftoffRegister lhs,
                                                 uint8_t imm_lane_idx) {
  Pextrb(dst.gp(), lhs.fp(), imm_lane_idx);
  movsxbl(dst.gp(), dst.gp());
}

void LiftoffAssembler::emit_i8x16_extract_lane_u(LiftoffRegister dst,
                                                 LiftoffRegister lhs,
                                                 uint8_t imm_lane_idx) {
  Pextrb(dst.gp(), lhs.fp(), imm_lane_idx);
}

void LiftoffAssembler::emit_i16x8_extract_lane_s(LiftoffRegister dst,
                                                 LiftoffRegister lhs,
                                                 uint8_t imm_lane_idx) {
  Pextrw(dst.gp(), lhs.fp(), imm_lane_idx);
  movsxwl(dst.gp(), dst.gp());
}

void LiftoffAssembler::emit_i16x8_extract_lane_u(LiftoffRegister dst,
                                                 LiftoffRegister lhs,
                                                 uint8_t imm_lane_idx) {
  Pextrw(dst.gp(), lhs.fp(), imm_lane_idx);
}

void LiftoffAssembler::emit_i32x4_extract_lane(LiftoffRegister dst,
                                               LiftoffRegister lhs,
                                               uint8_t imm_lane_idx) {
  Pextrd(dst.gp(), lhs.fp(), imm_lane_idx);
}

void LiftoffAssembler::emit_i64x2_extract_lane(LiftoffRegister dst,
                                               LiftoffRegister lhs,
                                               uint8_t imm_lane_idx) {
  Pextrq(dst.gp(), lhs.fp(), static_cast<int8_t>(imm_lane_idx));
}

void LiftoffAssembler::emit_f32x4_extract_lane(LiftoffRegister dst,
                                               LiftoffRegister lhs,
                                               uint8_t imm_lane_idx) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vshufps(dst.fp(), lhs.fp(), lhs.fp(), imm_lane_idx);
  } else {
    if (dst.fp() != lhs.fp()) movaps(dst.fp(), lhs.fp());
    if (imm_lane_idx != 0) shufps(dst.fp(), dst.fp(), imm_lane_idx);
  }
}

void LiftoffAssembler::emit_f64x2_extract_lane(LiftoffRegister dst,
                                               LiftoffRegister lhs,
                                               uint8_t imm_lane_idx) {
  Pextrq(kScratchRegister, lhs.fp(), static_cast<int8_t>(imm_lane_idx));
  Movq(dst.fp(), kScratchRegister);
}

void LiftoffAssembler::emit_i8x16_replace_lane(LiftoffRegister dst,
                                               LiftoffRegister src1,
                                               LiftoffRegister src2,
                                               uint8_t imm_lane_idx) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpinsrb(dst.fp(), src1.fp(), src2.gp(), imm_lane_idx);
  } else {
    CpuFeatureScope scope(this, SSE4_1);
    if (dst.fp() != src1.fp()) movaps(dst.fp(), src1.fp());
    pinsrb(dst.fp(), src2.gp(), imm_lane_idx);
  }
}

void LiftoffAssembler::emit_i16x8_replace_lane(LiftoffRegister dst,
                                               LiftoffRegister src1,
                                               LiftoffRegister src2,
                                               uint8_t imm_lane_idx) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpinsrw(dst.fp(), src1.fp(), src2.gp(), imm_lane_idx);
  } else {
    if (dst.fp() != src1.fp()) movaps(dst.fp(), src1.fp());
    pinsrw(dst.fp(), src2.gp(), imm_lane_idx);
  }
}

void LiftoffAssembler::emit_i32x4_replace_lane(LiftoffRegister dst,
                                               LiftoffRegister src1,
                                               LiftoffRegister src2,
                                               uint8_t imm_lane_idx) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpinsrd(dst.fp(), src1.fp(), src2.gp(), imm_lane_idx);
  } else {
    CpuFeatureScope scope(this, SSE4_1);
    if (dst.fp() != src1.fp()) movaps(dst.fp(), src1.fp());
    pinsrd(dst.fp(), src2.gp(), imm_lane_idx);
  }
}

void LiftoffAssembler::emit_i64x2_replace_lane(LiftoffRegister dst,
                                               LiftoffRegister src1,
                                               LiftoffRegister src2,
                                               uint8_t imm_lane_idx) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vpinsrq(dst.fp(), src1.fp(), src2.gp(), imm_lane_idx);
  } else {
    CpuFeatureScope scope(this, SSE4_1);
    if (dst.fp() != src1.fp()) movaps(dst.fp(), src1.fp());
    pinsrq(dst.fp(), src2.gp(), imm_lane_idx);
  }
}

void LiftoffAssembler::emit_f32x4_replace_lane(LiftoffRegister dst,
                                               LiftoffRegister src1,
                                               LiftoffRegister src2,
                                               uint8_t imm_lane_idx) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    vinsertps(dst.fp(), src1.fp(), src2.fp(), (imm_lane_idx << 4) & 0x30);
  } else {
    CpuFeatureScope scope(this, SSE4_1);
    if (dst.fp() != src1.fp()) movaps(dst.fp(), src1.fp());
    insertps(dst.fp(), src2.fp(), (imm_lane_idx << 4) & 0x30);
  }
}

void LiftoffAssembler::emit_f64x2_replace_lane(LiftoffRegister dst,
                                               LiftoffRegister src1,
                                               LiftoffRegister src2,
                                               uint8_t imm_lane_idx) {
  if (CpuFeatures::IsSupported(AVX)) {
    CpuFeatureScope scope(this, AVX);
    if (imm_lane_idx == 0) {
      vpblendw(dst.fp(), src1.fp(), src2.fp(), 0b00001111);
    } else {
      vmovlhps(dst.fp(), src1.fp(), src2.fp());
    }
  } else {
    CpuFeatureScope scope(this, SSE4_1);
    if (dst.fp() != src1.fp()) movaps(dst.fp(), src1.fp());
    if (imm_lane_idx == 0) {
      pblendw(dst.fp(), src2.fp(), 0b00001111);
    } else {
      movlhps(dst.fp(), src2.fp());
    }
  }
}

void LiftoffAssembler::StackCheck(Label* ool_code, Register limit_address) {
  cmpq(rsp, Operand(limit_address, 0));
  j(below_equal, ool_code);
}

void LiftoffAssembler::CallTrapCallbackForTesting() {
  PrepareCallCFunction(0);
  CallCFunction(ExternalReference::wasm_call_trap_callback_for_testing(), 0);
}

void LiftoffAssembler::AssertUnreachable(AbortReason reason) {
  TurboAssembler::AssertUnreachable(reason);
}

void LiftoffAssembler::PushRegisters(LiftoffRegList regs) {
  LiftoffRegList gp_regs = regs & kGpCacheRegList;
  while (!gp_regs.is_empty()) {
    LiftoffRegister reg = gp_regs.GetFirstRegSet();
    pushq(reg.gp());
    gp_regs.clear(reg);
  }
  LiftoffRegList fp_regs = regs & kFpCacheRegList;
  unsigned num_fp_regs = fp_regs.GetNumRegsSet();
  if (num_fp_regs) {
    AllocateStackSpace(num_fp_regs * kSimd128Size);
    unsigned offset = 0;
    while (!fp_regs.is_empty()) {
      LiftoffRegister reg = fp_regs.GetFirstRegSet();
      Movdqu(Operand(rsp, offset), reg.fp());
      fp_regs.clear(reg);
      offset += kSimd128Size;
    }
    DCHECK_EQ(offset, num_fp_regs * kSimd128Size);
  }
}

void LiftoffAssembler::PopRegisters(LiftoffRegList regs) {
  LiftoffRegList fp_regs = regs & kFpCacheRegList;
  unsigned fp_offset = 0;
  while (!fp_regs.is_empty()) {
    LiftoffRegister reg = fp_regs.GetFirstRegSet();
    Movdqu(reg.fp(), Operand(rsp, fp_offset));
    fp_regs.clear(reg);
    fp_offset += kSimd128Size;
  }
  if (fp_offset) addq(rsp, Immediate(fp_offset));
  LiftoffRegList gp_regs = regs & kGpCacheRegList;
  while (!gp_regs.is_empty()) {
    LiftoffRegister reg = gp_regs.GetLastRegSet();
    popq(reg.gp());
    gp_regs.clear(reg);
  }
}

void LiftoffAssembler::DropStackSlotsAndRet(uint32_t num_stack_slots) {
  DCHECK_LT(num_stack_slots,
            (1 << 16) / kSystemPointerSize);  // 16 bit immediate
  ret(static_cast<int>(num_stack_slots * kSystemPointerSize));
}

void LiftoffAssembler::CallC(const wasm::FunctionSig* sig,
                             const LiftoffRegister* args,
                             const LiftoffRegister* rets,
                             ValueType out_argument_type, int stack_bytes,
                             ExternalReference ext_ref) {
  AllocateStackSpace(stack_bytes);

  int arg_bytes = 0;
  for (ValueType param_type : sig->parameters()) {
    liftoff::Store(this, Operand(rsp, arg_bytes), *args++, param_type);
    arg_bytes += param_type.element_size_bytes();
  }
  DCHECK_LE(arg_bytes, stack_bytes);

  // Pass a pointer to the buffer with the arguments to the C function.
  movq(arg_reg_1, rsp);

  constexpr int kNumCCallArgs = 1;

  // Now call the C function.
  PrepareCallCFunction(kNumCCallArgs);
  CallCFunction(ext_ref, kNumCCallArgs);

  // Move return value to the right register.
  const LiftoffRegister* next_result_reg = rets;
  if (sig->return_count() > 0) {
    DCHECK_EQ(1, sig->return_count());
    constexpr Register kReturnReg = rax;
    if (kReturnReg != next_result_reg->gp()) {
      Move(*next_result_reg, LiftoffRegister(kReturnReg), sig->GetReturn(0));
    }
    ++next_result_reg;
  }

  // Load potential output value from the buffer on the stack.
  if (out_argument_type != kWasmStmt) {
    liftoff::Load(this, *next_result_reg, Operand(rsp, 0), out_argument_type);
  }

  addq(rsp, Immediate(stack_bytes));
}

void LiftoffAssembler::CallNativeWasmCode(Address addr) {
  near_call(addr, RelocInfo::WASM_CALL);
}

void LiftoffAssembler::TailCallNativeWasmCode(Address addr) {
  near_jmp(addr, RelocInfo::WASM_CALL);
}

void LiftoffAssembler::CallIndirect(const wasm::FunctionSig* sig,
                                    compiler::CallDescriptor* call_descriptor,
                                    Register target) {
  if (target == no_reg) {
    popq(kScratchRegister);
    target = kScratchRegister;
  }
  if (FLAG_untrusted_code_mitigations) {
    RetpolineCall(target);
  } else {
    call(target);
  }
}

void LiftoffAssembler::TailCallIndirect(Register target) {
  if (target == no_reg) {
    popq(kScratchRegister);
    target = kScratchRegister;
  }
  if (FLAG_untrusted_code_mitigations) {
    RetpolineJump(target);
  } else {
    jmp(target);
  }
}

void LiftoffAssembler::CallRuntimeStub(WasmCode::RuntimeStubId sid) {
  // A direct call to a wasm runtime stub defined in this module.
  // Just encode the stub index. This will be patched at relocation.
  near_call(static_cast<Address>(sid), RelocInfo::WASM_STUB_CALL);
}

void LiftoffAssembler::AllocateStackSlot(Register addr, uint32_t size) {
  AllocateStackSpace(size);
  movq(addr, rsp);
}

void LiftoffAssembler::DeallocateStackSlot(uint32_t size) {
  addq(rsp, Immediate(size));
}

void LiftoffStackSlots::Construct() {
  for (auto& slot : slots_) {
    const LiftoffAssembler::VarState& src = slot.src_;
    switch (src.loc()) {
      case LiftoffAssembler::VarState::kStack:
        if (src.type() == kWasmI32) {
          // Load i32 values to a register first to ensure they are zero
          // extended.
          asm_->movl(kScratchRegister, liftoff::GetStackSlot(slot.src_offset_));
          asm_->pushq(kScratchRegister);
        } else if (src.type() == kWasmS128) {
          // Since offsets are subtracted from sp, we need a smaller offset to
          // push the top of a s128 value.
          asm_->pushq(liftoff::GetStackSlot(slot.src_offset_ - 8));
          asm_->pushq(liftoff::GetStackSlot(slot.src_offset_));
        } else {
          // For all other types, just push the whole (8-byte) stack slot.
          // This is also ok for f32 values (even though we copy 4 uninitialized
          // bytes), because f32 and f64 values are clearly distinguished in
          // Turbofan, so the uninitialized bytes are never accessed.
          asm_->pushq(liftoff::GetStackSlot(slot.src_offset_));
        }
        break;
      case LiftoffAssembler::VarState::kRegister:
        liftoff::push(asm_, src.reg(), src.type());
        break;
      case LiftoffAssembler::VarState::kIntConst:
        asm_->pushq(Immediate(src.i32_const()));
        break;
    }
  }
}

#undef RETURN_FALSE_IF_MISSING_CPU_FEATURE

}  // namespace wasm
}  // namespace internal
}  // namespace v8

#endif  // V8_WASM_BASELINE_X64_LIFTOFF_ASSEMBLER_X64_H_