Rename A64 port to ARM64 port

src/a64/macro-assembler-a64.cc

-// Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if V8_TARGET_ARCH_A64
-
-#include "bootstrapper.h"
-#include "codegen.h"
-#include "cpu-profiler.h"
-#include "debug.h"
-#include "isolate-inl.h"
-#include "runtime.h"
-
-namespace v8 {
-namespace internal {
-
-// Define a fake double underscore to use with the ASM_UNIMPLEMENTED macros.
-#define __
-
-
-MacroAssembler::MacroAssembler(Isolate* arg_isolate,
-                               byte * buffer,
-                               unsigned buffer_size)
-    : Assembler(arg_isolate, buffer, buffer_size),
-      generating_stub_(false),
-#if DEBUG
-      allow_macro_instructions_(true),
-#endif
-      has_frame_(false),
-      use_real_aborts_(true),
-      sp_(jssp), tmp_list_(ip0, ip1), fptmp_list_(fp_scratch) {
-  if (isolate() != NULL) {
-    code_object_ = Handle<Object>(isolate()->heap()->undefined_value(),
-                                  isolate());
-  }
-}
-
-
-void MacroAssembler::LogicalMacro(const Register& rd,
-                                  const Register& rn,
-                                  const Operand& operand,
-                                  LogicalOp op) {
-  UseScratchRegisterScope temps(this);
-
-  if (operand.NeedsRelocation()) {
-    Register temp = temps.AcquireX();
-    LoadRelocated(temp, operand);
-    Logical(rd, rn, temp, op);
-
-  } else if (operand.IsImmediate()) {
-    int64_t immediate = operand.immediate();
-    unsigned reg_size = rd.SizeInBits();
-    ASSERT(rd.Is64Bits() || is_uint32(immediate));
-
-    // If the operation is NOT, invert the operation and immediate.
-    if ((op & NOT) == NOT) {
-      op = static_cast<LogicalOp>(op & ~NOT);
-      immediate = ~immediate;
-      if (rd.Is32Bits()) {
-        immediate &= kWRegMask;
-      }
-    }
-
-    // Special cases for all set or all clear immediates.
-    if (immediate == 0) {
-      switch (op) {
-        case AND:
-          Mov(rd, 0);
-          return;
-        case ORR:  // Fall through.
-        case EOR:
-          Mov(rd, rn);
-          return;
-        case ANDS:  // Fall through.
-        case BICS:
-          break;
-        default:
-          UNREACHABLE();
-      }
-    } else if ((rd.Is64Bits() && (immediate == -1L)) ||
-               (rd.Is32Bits() && (immediate == 0xffffffffL))) {
-      switch (op) {
-        case AND:
-          Mov(rd, rn);
-          return;
-        case ORR:
-          Mov(rd, immediate);
-          return;
-        case EOR:
-          Mvn(rd, rn);
-          return;
-        case ANDS:  // Fall through.
-        case BICS:
-          break;
-        default:
-          UNREACHABLE();
-      }
-    }
-
-    unsigned n, imm_s, imm_r;
-    if (IsImmLogical(immediate, reg_size, &n, &imm_s, &imm_r)) {
-      // Immediate can be encoded in the instruction.
-      LogicalImmediate(rd, rn, n, imm_s, imm_r, op);
-    } else {
-      // Immediate can't be encoded: synthesize using move immediate.
-      Register temp = temps.AcquireSameSizeAs(rn);
-      Mov(temp, immediate);
-      if (rd.Is(csp)) {
-        // If rd is the stack pointer we cannot use it as the destination
-        // register so we use the temp register as an intermediate again.
-        Logical(temp, rn, temp, op);
-        Mov(csp, temp);
-      } else {
-        Logical(rd, rn, temp, op);
-      }
-    }
-
-  } else if (operand.IsExtendedRegister()) {
-    ASSERT(operand.reg().SizeInBits() <= rd.SizeInBits());
-    // Add/sub extended supports shift <= 4. We want to support exactly the
-    // same modes here.
-    ASSERT(operand.shift_amount() <= 4);
-    ASSERT(operand.reg().Is64Bits() ||
-           ((operand.extend() != UXTX) && (operand.extend() != SXTX)));
-    Register temp = temps.AcquireSameSizeAs(rn);
-    EmitExtendShift(temp, operand.reg(), operand.extend(),
-                    operand.shift_amount());
-    Logical(rd, rn, temp, op);
-
-  } else {
-    // The operand can be encoded in the instruction.
-    ASSERT(operand.IsShiftedRegister());
-    Logical(rd, rn, operand, op);
-  }
-}
-
-
-void MacroAssembler::Mov(const Register& rd, uint64_t imm) {
-  ASSERT(allow_macro_instructions_);
-  ASSERT(is_uint32(imm) || is_int32(imm) || rd.Is64Bits());
-  ASSERT(!rd.IsZero());
-
-  // TODO(all) extend to support more immediates.
-  //
-  // Immediates on Aarch64 can be produced using an initial value, and zero to
-  // three move keep operations.
-  //
-  // Initial values can be generated with:
-  //  1. 64-bit move zero (movz).
-  //  2. 32-bit move inverted (movn).
-  //  3. 64-bit move inverted.
-  //  4. 32-bit orr immediate.
-  //  5. 64-bit orr immediate.
-  // Move-keep may then be used to modify each of the 16-bit half-words.
-  //
-  // The code below supports all five initial value generators, and
-  // applying move-keep operations to move-zero and move-inverted initial
-  // values.
-
-  unsigned reg_size = rd.SizeInBits();
-  unsigned n, imm_s, imm_r;
-  if (IsImmMovz(imm, reg_size) && !rd.IsSP()) {
-    // Immediate can be represented in a move zero instruction. Movz can't
-    // write to the stack pointer.
-    movz(rd, imm);
-  } else if (IsImmMovn(imm, reg_size) && !rd.IsSP()) {
-    // Immediate can be represented in a move inverted instruction. Movn can't
-    // write to the stack pointer.
-    movn(rd, rd.Is64Bits() ? ~imm : (~imm & kWRegMask));
-  } else if (IsImmLogical(imm, reg_size, &n, &imm_s, &imm_r)) {
-    // Immediate can be represented in a logical orr instruction.
-    LogicalImmediate(rd, AppropriateZeroRegFor(rd), n, imm_s, imm_r, ORR);
-  } else {
-    // Generic immediate case. Imm will be represented by
-    //   [imm3, imm2, imm1, imm0], where each imm is 16 bits.
-    // A move-zero or move-inverted is generated for the first non-zero or
-    // non-0xffff immX, and a move-keep for subsequent non-zero immX.
-
-    uint64_t ignored_halfword = 0;
-    bool invert_move = false;
-    // If the number of 0xffff halfwords is greater than the number of 0x0000
-    // halfwords, it's more efficient to use move-inverted.
-    if (CountClearHalfWords(~imm, reg_size) >
-        CountClearHalfWords(imm, reg_size)) {
-      ignored_halfword = 0xffffL;
-      invert_move = true;
-    }
-
-    // Mov instructions can't move immediate values into the stack pointer, so
-    // set up a temporary register, if needed.
-    UseScratchRegisterScope temps(this);
-    Register temp = rd.IsSP() ? temps.AcquireSameSizeAs(rd) : rd;
-
-    // Iterate through the halfwords. Use movn/movz for the first non-ignored
-    // halfword, and movk for subsequent halfwords.
-    ASSERT((reg_size % 16) == 0);
-    bool first_mov_done = false;
-    for (unsigned i = 0; i < (rd.SizeInBits() / 16); i++) {
-      uint64_t imm16 = (imm >> (16 * i)) & 0xffffL;
-      if (imm16 != ignored_halfword) {
-        if (!first_mov_done) {
-          if (invert_move) {
-            movn(temp, (~imm16) & 0xffffL, 16 * i);
-          } else {
-            movz(temp, imm16, 16 * i);
-          }
-          first_mov_done = true;
-        } else {
-          // Construct a wider constant.
-          movk(temp, imm16, 16 * i);
-        }
-      }
-    }
-    ASSERT(first_mov_done);
-
-    // Move the temporary if the original destination register was the stack
-    // pointer.
-    if (rd.IsSP()) {
-      mov(rd, temp);
-    }
-  }
-}
-
-
-void MacroAssembler::Mov(const Register& rd,
-                         const Operand& operand,
-                         DiscardMoveMode discard_mode) {
-  ASSERT(allow_macro_instructions_);
-  ASSERT(!rd.IsZero());
-
-  // Provide a swap register for instructions that need to write into the
-  // system stack pointer (and can't do this inherently).
-  UseScratchRegisterScope temps(this);
-  Register dst = (rd.IsSP()) ? temps.AcquireSameSizeAs(rd) : rd;
-
-  if (operand.NeedsRelocation()) {
-    LoadRelocated(dst, operand);
-
-  } else if (operand.IsImmediate()) {
-    // Call the macro assembler for generic immediates.
-    Mov(dst, operand.immediate());
-
-  } else if (operand.IsShiftedRegister() && (operand.shift_amount() != 0)) {
-    // Emit a shift instruction if moving a shifted register. This operation
-    // could also be achieved using an orr instruction (like orn used by Mvn),
-    // but using a shift instruction makes the disassembly clearer.
-    EmitShift(dst, operand.reg(), operand.shift(), operand.shift_amount());
-
-  } else if (operand.IsExtendedRegister()) {
-    // Emit an extend instruction if moving an extended register. This handles
-    // extend with post-shift operations, too.
-    EmitExtendShift(dst, operand.reg(), operand.extend(),
-                    operand.shift_amount());
-
-  } else {
-    // Otherwise, emit a register move only if the registers are distinct, or
-    // if they are not X registers.
-    //
-    // Note that mov(w0, w0) is not a no-op because it clears the top word of
-    // x0. A flag is provided (kDiscardForSameWReg) if a move between the same W
-    // registers is not required to clear the top word of the X register. In
-    // this case, the instruction is discarded.
-    //
-    // If csp is an operand, add #0 is emitted, otherwise, orr #0.
-    if (!rd.Is(operand.reg()) || (rd.Is32Bits() &&
-                                  (discard_mode == kDontDiscardForSameWReg))) {
-      Assembler::mov(rd, operand.reg());
-    }
-    // This case can handle writes into the system stack pointer directly.
-    dst = rd;
-  }
-
-  // Copy the result to the system stack pointer.
-  if (!dst.Is(rd)) {
-    ASSERT(rd.IsSP());
-    Assembler::mov(rd, dst);
-  }
-}
-
-
-void MacroAssembler::Mvn(const Register& rd, const Operand& operand) {
-  ASSERT(allow_macro_instructions_);
-
-  if (operand.NeedsRelocation()) {
-    LoadRelocated(rd, operand);
-    mvn(rd, rd);
-
-  } else if (operand.IsImmediate()) {
-    // Call the macro assembler for generic immediates.
-    Mov(rd, ~operand.immediate());
-
-  } else if (operand.IsExtendedRegister()) {
-    // Emit two instructions for the extend case. This differs from Mov, as
-    // the extend and invert can't be achieved in one instruction.
-    EmitExtendShift(rd, operand.reg(), operand.extend(),
-                    operand.shift_amount());
-    mvn(rd, rd);
-
-  } else {
-    mvn(rd, operand);
-  }
-}
-
-
-unsigned MacroAssembler::CountClearHalfWords(uint64_t imm, unsigned reg_size) {
-  ASSERT((reg_size % 8) == 0);
-  int count = 0;
-  for (unsigned i = 0; i < (reg_size / 16); i++) {
-    if ((imm & 0xffff) == 0) {
-      count++;
-    }
-    imm >>= 16;
-  }
-  return count;
-}
-
-
-// The movz instruction can generate immediates containing an arbitrary 16-bit
-// half-word, with remaining bits clear, eg. 0x00001234, 0x0000123400000000.
-bool MacroAssembler::IsImmMovz(uint64_t imm, unsigned reg_size) {
-  ASSERT((reg_size == kXRegSizeInBits) || (reg_size == kWRegSizeInBits));
-  return CountClearHalfWords(imm, reg_size) >= ((reg_size / 16) - 1);
-}
-
-
-// The movn instruction can generate immediates containing an arbitrary 16-bit
-// half-word, with remaining bits set, eg. 0xffff1234, 0xffff1234ffffffff.
-bool MacroAssembler::IsImmMovn(uint64_t imm, unsigned reg_size) {
-  return IsImmMovz(~imm, reg_size);
-}
-
-
-void MacroAssembler::ConditionalCompareMacro(const Register& rn,
-                                             const Operand& operand,
-                                             StatusFlags nzcv,
-                                             Condition cond,
-                                             ConditionalCompareOp op) {
-  ASSERT((cond != al) && (cond != nv));
-  if (operand.NeedsRelocation()) {
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireX();
-    LoadRelocated(temp, operand);
-    ConditionalCompareMacro(rn, temp, nzcv, cond, op);
-
-  } else if ((operand.IsShiftedRegister() && (operand.shift_amount() == 0)) ||
-      (operand.IsImmediate() && IsImmConditionalCompare(operand.immediate()))) {
-    // The immediate can be encoded in the instruction, or the operand is an
-    // unshifted register: call the assembler.
-    ConditionalCompare(rn, operand, nzcv, cond, op);
-
-  } else {
-    // The operand isn't directly supported by the instruction: perform the
-    // operation on a temporary register.
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireSameSizeAs(rn);
-    Mov(temp, operand);
-    ConditionalCompare(rn, temp, nzcv, cond, op);
-  }
-}
-
-
-void MacroAssembler::Csel(const Register& rd,
-                          const Register& rn,
-                          const Operand& operand,
-                          Condition cond) {
-  ASSERT(allow_macro_instructions_);
-  ASSERT(!rd.IsZero());
-  ASSERT((cond != al) && (cond != nv));
-  if (operand.IsImmediate()) {
-    // Immediate argument. Handle special cases of 0, 1 and -1 using zero
-    // register.
-    int64_t imm = operand.immediate();
-    Register zr = AppropriateZeroRegFor(rn);
-    if (imm == 0) {
-      csel(rd, rn, zr, cond);
-    } else if (imm == 1) {
-      csinc(rd, rn, zr, cond);
-    } else if (imm == -1) {
-      csinv(rd, rn, zr, cond);
-    } else {
-      UseScratchRegisterScope temps(this);
-      Register temp = temps.AcquireSameSizeAs(rn);
-      Mov(temp, operand.immediate());
-      csel(rd, rn, temp, cond);
-    }
-  } else if (operand.IsShiftedRegister() && (operand.shift_amount() == 0)) {
-    // Unshifted register argument.
-    csel(rd, rn, operand.reg(), cond);
-  } else {
-    // All other arguments.
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireSameSizeAs(rn);
-    Mov(temp, operand);
-    csel(rd, rn, temp, cond);
-  }
-}
-
-
-void MacroAssembler::AddSubMacro(const Register& rd,
-                                 const Register& rn,
-                                 const Operand& operand,
-                                 FlagsUpdate S,
-                                 AddSubOp op) {
-  if (operand.IsZero() && rd.Is(rn) && rd.Is64Bits() && rn.Is64Bits() &&
-      !operand.NeedsRelocation() && (S == LeaveFlags)) {
-    // The instruction would be a nop. Avoid generating useless code.
-    return;
-  }
-
-  if (operand.NeedsRelocation()) {
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireX();
-    LoadRelocated(temp, operand);
-    AddSubMacro(rd, rn, temp, S, op);
-  } else if ((operand.IsImmediate() && !IsImmAddSub(operand.immediate())) ||
-             (rn.IsZero() && !operand.IsShiftedRegister())                ||
-             (operand.IsShiftedRegister() && (operand.shift() == ROR))) {
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireSameSizeAs(rn);
-    Mov(temp, operand);
-    AddSub(rd, rn, temp, S, op);
-  } else {
-    AddSub(rd, rn, operand, S, op);
-  }
-}
-
-
-void MacroAssembler::AddSubWithCarryMacro(const Register& rd,
-                                          const Register& rn,
-                                          const Operand& operand,
-                                          FlagsUpdate S,
-                                          AddSubWithCarryOp op) {
-  ASSERT(rd.SizeInBits() == rn.SizeInBits());
-  UseScratchRegisterScope temps(this);
-
-  if (operand.NeedsRelocation()) {
-    Register temp = temps.AcquireX();
-    LoadRelocated(temp, operand);
-    AddSubWithCarryMacro(rd, rn, temp, S, op);
-
-  } else if (operand.IsImmediate() ||
-             (operand.IsShiftedRegister() && (operand.shift() == ROR))) {
-    // Add/sub with carry (immediate or ROR shifted register.)
-    Register temp = temps.AcquireSameSizeAs(rn);
-    Mov(temp, operand);
-    AddSubWithCarry(rd, rn, temp, S, op);
-
-  } else if (operand.IsShiftedRegister() && (operand.shift_amount() != 0)) {
-    // Add/sub with carry (shifted register).
-    ASSERT(operand.reg().SizeInBits() == rd.SizeInBits());
-    ASSERT(operand.shift() != ROR);
-    ASSERT(is_uintn(operand.shift_amount(),
-          rd.SizeInBits() == kXRegSizeInBits ? kXRegSizeInBitsLog2
-                                             : kWRegSizeInBitsLog2));
-    Register temp = temps.AcquireSameSizeAs(rn);
-    EmitShift(temp, operand.reg(), operand.shift(), operand.shift_amount());
-    AddSubWithCarry(rd, rn, temp, S, op);
-
-  } else if (operand.IsExtendedRegister()) {
-    // Add/sub with carry (extended register).
-    ASSERT(operand.reg().SizeInBits() <= rd.SizeInBits());
-    // Add/sub extended supports a shift <= 4. We want to support exactly the
-    // same modes.
-    ASSERT(operand.shift_amount() <= 4);
-    ASSERT(operand.reg().Is64Bits() ||
-           ((operand.extend() != UXTX) && (operand.extend() != SXTX)));
-    Register temp = temps.AcquireSameSizeAs(rn);
-    EmitExtendShift(temp, operand.reg(), operand.extend(),
-                    operand.shift_amount());
-    AddSubWithCarry(rd, rn, temp, S, op);
-
-  } else {
-    // The addressing mode is directly supported by the instruction.
-    AddSubWithCarry(rd, rn, operand, S, op);
-  }
-}
-
-
-void MacroAssembler::LoadStoreMacro(const CPURegister& rt,
-                                    const MemOperand& addr,
-                                    LoadStoreOp op) {
-  int64_t offset = addr.offset();
-  LSDataSize size = CalcLSDataSize(op);
-
-  // Check if an immediate offset fits in the immediate field of the
-  // appropriate instruction. If not, emit two instructions to perform
-  // the operation.
-  if (addr.IsImmediateOffset() && !IsImmLSScaled(offset, size) &&
-      !IsImmLSUnscaled(offset)) {
-    // Immediate offset that can't be encoded using unsigned or unscaled
-    // addressing modes.
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireSameSizeAs(addr.base());
-    Mov(temp, addr.offset());
-    LoadStore(rt, MemOperand(addr.base(), temp), op);
-  } else if (addr.IsPostIndex() && !IsImmLSUnscaled(offset)) {
-    // Post-index beyond unscaled addressing range.
-    LoadStore(rt, MemOperand(addr.base()), op);
-    add(addr.base(), addr.base(), offset);
-  } else if (addr.IsPreIndex() && !IsImmLSUnscaled(offset)) {
-    // Pre-index beyond unscaled addressing range.
-    add(addr.base(), addr.base(), offset);
-    LoadStore(rt, MemOperand(addr.base()), op);
-  } else {
-    // Encodable in one load/store instruction.
-    LoadStore(rt, addr, op);
-  }
-}
-
-
-void MacroAssembler::Load(const Register& rt,
-                          const MemOperand& addr,
-                          Representation r) {
-  ASSERT(!r.IsDouble());
-
-  if (r.IsInteger8()) {
-    Ldrsb(rt, addr);
-  } else if (r.IsUInteger8()) {
-    Ldrb(rt, addr);
-  } else if (r.IsInteger16()) {
-    Ldrsh(rt, addr);
-  } else if (r.IsUInteger16()) {
-    Ldrh(rt, addr);
-  } else if (r.IsInteger32()) {
-    Ldr(rt.W(), addr);
-  } else {
-    ASSERT(rt.Is64Bits());
-    Ldr(rt, addr);
-  }
-}
-
-
-void MacroAssembler::Store(const Register& rt,
-                           const MemOperand& addr,
-                           Representation r) {
-  ASSERT(!r.IsDouble());
-
-  if (r.IsInteger8() || r.IsUInteger8()) {
-    Strb(rt, addr);
-  } else if (r.IsInteger16() || r.IsUInteger16()) {
-    Strh(rt, addr);
-  } else if (r.IsInteger32()) {
-    Str(rt.W(), addr);
-  } else {
-    ASSERT(rt.Is64Bits());
-    Str(rt, addr);
-  }
-}
-
-
-bool MacroAssembler::NeedExtraInstructionsOrRegisterBranch(
-    Label *label, ImmBranchType b_type) {
-  bool need_longer_range = false;
-  // There are two situations in which we care about the offset being out of
-  // range:
-  //  - The label is bound but too far away.
-  //  - The label is not bound but linked, and the previous branch
-  //    instruction in the chain is too far away.
-  if (label->is_bound() || label->is_linked()) {
-    need_longer_range =
-      !Instruction::IsValidImmPCOffset(b_type, label->pos() - pc_offset());
-  }
-  if (!need_longer_range && !label->is_bound()) {
-    int max_reachable_pc = pc_offset() + Instruction::ImmBranchRange(b_type);
-    unresolved_branches_.insert(
-        std::pair<int, FarBranchInfo>(max_reachable_pc,
-                                      FarBranchInfo(pc_offset(), label)));
-    // Also maintain the next pool check.
-    next_veneer_pool_check_ =
-      Min(next_veneer_pool_check_,
-          max_reachable_pc - kVeneerDistanceCheckMargin);
-  }
-  return need_longer_range;
-}
-
-
-void MacroAssembler::B(Label* label, BranchType type, Register reg, int bit) {
-  ASSERT((reg.Is(NoReg) || type >= kBranchTypeFirstUsingReg) &&
-         (bit == -1 || type >= kBranchTypeFirstUsingBit));
-  if (kBranchTypeFirstCondition <= type && type <= kBranchTypeLastCondition) {
-    B(static_cast<Condition>(type), label);
-  } else {
-    switch (type) {
-      case always:        B(label);              break;
-      case never:         break;
-      case reg_zero:      Cbz(reg, label);       break;
-      case reg_not_zero:  Cbnz(reg, label);      break;
-      case reg_bit_clear: Tbz(reg, bit, label);  break;
-      case reg_bit_set:   Tbnz(reg, bit, label); break;
-      default:
-        UNREACHABLE();
-    }
-  }
-}
-
-
-void MacroAssembler::B(Label* label, Condition cond) {
-  ASSERT(allow_macro_instructions_);
-  ASSERT((cond != al) && (cond != nv));
-
-  Label done;
-  bool need_extra_instructions =
-    NeedExtraInstructionsOrRegisterBranch(label, CondBranchType);
-
-  if (need_extra_instructions) {
-    b(&done, InvertCondition(cond));
-    B(label);
-  } else {
-    b(label, cond);
-  }
-  bind(&done);
-}
-
-
-void MacroAssembler::Tbnz(const Register& rt, unsigned bit_pos, Label* label) {
-  ASSERT(allow_macro_instructions_);
-
-  Label done;
-  bool need_extra_instructions =
-    NeedExtraInstructionsOrRegisterBranch(label, TestBranchType);
-
-  if (need_extra_instructions) {
-    tbz(rt, bit_pos, &done);
-    B(label);
-  } else {
-    tbnz(rt, bit_pos, label);
-  }
-  bind(&done);
-}
-
-
-void MacroAssembler::Tbz(const Register& rt, unsigned bit_pos, Label* label) {
-  ASSERT(allow_macro_instructions_);
-
-  Label done;
-  bool need_extra_instructions =
-    NeedExtraInstructionsOrRegisterBranch(label, TestBranchType);
-
-  if (need_extra_instructions) {
-    tbnz(rt, bit_pos, &done);
-    B(label);
-  } else {
-    tbz(rt, bit_pos, label);
-  }
-  bind(&done);
-}
-
-
-void MacroAssembler::Cbnz(const Register& rt, Label* label) {
-  ASSERT(allow_macro_instructions_);
-
-  Label done;
-  bool need_extra_instructions =
-    NeedExtraInstructionsOrRegisterBranch(label, CompareBranchType);
-
-  if (need_extra_instructions) {
-    cbz(rt, &done);
-    B(label);
-  } else {
-    cbnz(rt, label);
-  }
-  bind(&done);
-}
-
-
-void MacroAssembler::Cbz(const Register& rt, Label* label) {
-  ASSERT(allow_macro_instructions_);
-
-  Label done;
-  bool need_extra_instructions =
-    NeedExtraInstructionsOrRegisterBranch(label, CompareBranchType);
-
-  if (need_extra_instructions) {
-    cbnz(rt, &done);
-    B(label);
-  } else {
-    cbz(rt, label);
-  }
-  bind(&done);
-}
-
-
-// Pseudo-instructions.
-
-
-void MacroAssembler::Abs(const Register& rd, const Register& rm,
-                         Label* is_not_representable,
-                         Label* is_representable) {
-  ASSERT(allow_macro_instructions_);
-  ASSERT(AreSameSizeAndType(rd, rm));
-
-  Cmp(rm, 1);
-  Cneg(rd, rm, lt);
-
-  // If the comparison sets the v flag, the input was the smallest value
-  // representable by rm, and the mathematical result of abs(rm) is not
-  // representable using two's complement.
-  if ((is_not_representable != NULL) && (is_representable != NULL)) {
-    B(is_not_representable, vs);
-    B(is_representable);
-  } else if (is_not_representable != NULL) {
-    B(is_not_representable, vs);
-  } else if (is_representable != NULL) {
-    B(is_representable, vc);
-  }
-}
-
-
-// Abstracted stack operations.
-
-
-void MacroAssembler::Push(const CPURegister& src0, const CPURegister& src1,
-                          const CPURegister& src2, const CPURegister& src3) {
-  ASSERT(AreSameSizeAndType(src0, src1, src2, src3));
-
-  int count = 1 + src1.IsValid() + src2.IsValid() + src3.IsValid();
-  int size = src0.SizeInBytes();
-
-  PrepareForPush(count, size);
-  PushHelper(count, size, src0, src1, src2, src3);
-}
-
-
-void MacroAssembler::Push(const CPURegister& src0, const CPURegister& src1,
-                          const CPURegister& src2, const CPURegister& src3,
-                          const CPURegister& src4, const CPURegister& src5,
-                          const CPURegister& src6, const CPURegister& src7) {
-  ASSERT(AreSameSizeAndType(src0, src1, src2, src3, src4, src5, src6, src7));
-
-  int count = 5 + src5.IsValid() + src6.IsValid() + src6.IsValid();
-  int size = src0.SizeInBytes();
-
-  PrepareForPush(count, size);
-  PushHelper(4, size, src0, src1, src2, src3);
-  PushHelper(count - 4, size, src4, src5, src6, src7);
-}
-
-
-void MacroAssembler::Pop(const CPURegister& dst0, const CPURegister& dst1,
-                         const CPURegister& dst2, const CPURegister& dst3) {
-  // It is not valid to pop into the same register more than once in one
-  // instruction, not even into the zero register.
-  ASSERT(!AreAliased(dst0, dst1, dst2, dst3));
-  ASSERT(AreSameSizeAndType(dst0, dst1, dst2, dst3));
-  ASSERT(dst0.IsValid());
-
-  int count = 1 + dst1.IsValid() + dst2.IsValid() + dst3.IsValid();
-  int size = dst0.SizeInBytes();
-
-  PrepareForPop(count, size);
-  PopHelper(count, size, dst0, dst1, dst2, dst3);
-
-  if (!csp.Is(StackPointer()) && emit_debug_code()) {
-    // It is safe to leave csp where it is when unwinding the JavaScript stack,
-    // but if we keep it matching StackPointer, the simulator can detect memory
-    // accesses in the now-free part of the stack.
-    Mov(csp, StackPointer());
-  }
-}
-
-
-void MacroAssembler::PushPopQueue::PushQueued() {
-  if (queued_.empty()) return;
-
-  masm_->PrepareForPush(size_);
-
-  int count = queued_.size();
-  int index = 0;
-  while (index < count) {
-    // PushHelper can only handle registers with the same size and type, and it
-    // can handle only four at a time. Batch them up accordingly.
-    CPURegister batch[4] = {NoReg, NoReg, NoReg, NoReg};
-    int batch_index = 0;
-    do {
-      batch[batch_index++] = queued_[index++];
-    } while ((batch_index < 4) && (index < count) &&
-             batch[0].IsSameSizeAndType(queued_[index]));
-
-    masm_->PushHelper(batch_index, batch[0].SizeInBytes(),
-                      batch[0], batch[1], batch[2], batch[3]);
-  }
-
-  queued_.clear();
-}
-
-
-void MacroAssembler::PushPopQueue::PopQueued() {
-  if (queued_.empty()) return;
-
-  masm_->PrepareForPop(size_);
-
-  int count = queued_.size();
-  int index = 0;
-  while (index < count) {
-    // PopHelper can only handle registers with the same size and type, and it
-    // can handle only four at a time. Batch them up accordingly.
-    CPURegister batch[4] = {NoReg, NoReg, NoReg, NoReg};
-    int batch_index = 0;
-    do {
-      batch[batch_index++] = queued_[index++];
-    } while ((batch_index < 4) && (index < count) &&
-             batch[0].IsSameSizeAndType(queued_[index]));
-
-    masm_->PopHelper(batch_index, batch[0].SizeInBytes(),
-                     batch[0], batch[1], batch[2], batch[3]);
-  }
-
-  queued_.clear();
-}
-
-
-void MacroAssembler::PushCPURegList(CPURegList registers) {
-  int size = registers.RegisterSizeInBytes();
-
-  PrepareForPush(registers.Count(), size);
-  // Push up to four registers at a time because if the current stack pointer is
-  // csp and reg_size is 32, registers must be pushed in blocks of four in order
-  // to maintain the 16-byte alignment for csp.
-  while (!registers.IsEmpty()) {
-    int count_before = registers.Count();
-    const CPURegister& src0 = registers.PopHighestIndex();
-    const CPURegister& src1 = registers.PopHighestIndex();
-    const CPURegister& src2 = registers.PopHighestIndex();
-    const CPURegister& src3 = registers.PopHighestIndex();
-    int count = count_before - registers.Count();
-    PushHelper(count, size, src0, src1, src2, src3);
-  }
-}
-
-
-void MacroAssembler::PopCPURegList(CPURegList registers) {
-  int size = registers.RegisterSizeInBytes();
-
-  PrepareForPop(registers.Count(), size);
-  // Pop up to four registers at a time because if the current stack pointer is
-  // csp and reg_size is 32, registers must be pushed in blocks of four in
-  // order to maintain the 16-byte alignment for csp.
-  while (!registers.IsEmpty()) {
-    int count_before = registers.Count();
-    const CPURegister& dst0 = registers.PopLowestIndex();
-    const CPURegister& dst1 = registers.PopLowestIndex();
-    const CPURegister& dst2 = registers.PopLowestIndex();
-    const CPURegister& dst3 = registers.PopLowestIndex();
-    int count = count_before - registers.Count();
-    PopHelper(count, size, dst0, dst1, dst2, dst3);
-  }
-
-  if (!csp.Is(StackPointer()) && emit_debug_code()) {
-    // It is safe to leave csp where it is when unwinding the JavaScript stack,
-    // but if we keep it matching StackPointer, the simulator can detect memory
-    // accesses in the now-free part of the stack.
-    Mov(csp, StackPointer());
-  }
-}
-
-
-void MacroAssembler::PushMultipleTimes(CPURegister src, int count) {
-  int size = src.SizeInBytes();
-
-  PrepareForPush(count, size);
-
-  if (FLAG_optimize_for_size && count > 8) {
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireX();
-
-    Label loop;
-    __ Mov(temp, count / 2);
-    __ Bind(&loop);
-    PushHelper(2, size, src, src, NoReg, NoReg);
-    __ Subs(temp, temp, 1);
-    __ B(ne, &loop);
-
-    count %= 2;
-  }
-
-  // Push up to four registers at a time if possible because if the current
-  // stack pointer is csp and the register size is 32, registers must be pushed
-  // in blocks of four in order to maintain the 16-byte alignment for csp.
-  while (count >= 4) {
-    PushHelper(4, size, src, src, src, src);
-    count -= 4;
-  }
-  if (count >= 2) {
-    PushHelper(2, size, src, src, NoReg, NoReg);
-    count -= 2;
-  }
-  if (count == 1) {
-    PushHelper(1, size, src, NoReg, NoReg, NoReg);
-    count -= 1;
-  }
-  ASSERT(count == 0);
-}
-
-
-void MacroAssembler::PushMultipleTimes(CPURegister src, Register count) {
-  PrepareForPush(Operand(count, UXTW, WhichPowerOf2(src.SizeInBytes())));
-
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireSameSizeAs(count);
-
-  if (FLAG_optimize_for_size) {
-    Label loop, done;
-
-    Subs(temp, count, 1);
-    B(mi, &done);
-
-    // Push all registers individually, to save code size.
-    Bind(&loop);
-    Subs(temp, temp, 1);
-    PushHelper(1, src.SizeInBytes(), src, NoReg, NoReg, NoReg);
-    B(pl, &loop);
-
-    Bind(&done);
-  } else {
-    Label loop, leftover2, leftover1, done;
-
-    Subs(temp, count, 4);
-    B(mi, &leftover2);
-
-    // Push groups of four first.
-    Bind(&loop);
-    Subs(temp, temp, 4);
-    PushHelper(4, src.SizeInBytes(), src, src, src, src);
-    B(pl, &loop);
-
-    // Push groups of two.
-    Bind(&leftover2);
-    Tbz(count, 1, &leftover1);
-    PushHelper(2, src.SizeInBytes(), src, src, NoReg, NoReg);
-
-    // Push the last one (if required).
-    Bind(&leftover1);
-    Tbz(count, 0, &done);
-    PushHelper(1, src.SizeInBytes(), src, NoReg, NoReg, NoReg);
-
-    Bind(&done);
-  }
-}
-
-
-void MacroAssembler::PushHelper(int count, int size,
-                                const CPURegister& src0,
-                                const CPURegister& src1,
-                                const CPURegister& src2,
-                                const CPURegister& src3) {
-  // Ensure that we don't unintentially modify scratch or debug registers.
-  InstructionAccurateScope scope(this);
-
-  ASSERT(AreSameSizeAndType(src0, src1, src2, src3));
-  ASSERT(size == src0.SizeInBytes());
-
-  // When pushing multiple registers, the store order is chosen such that
-  // Push(a, b) is equivalent to Push(a) followed by Push(b).
-  switch (count) {
-    case 1:
-      ASSERT(src1.IsNone() && src2.IsNone() && src3.IsNone());
-      str(src0, MemOperand(StackPointer(), -1 * size, PreIndex));
-      break;
-    case 2:
-      ASSERT(src2.IsNone() && src3.IsNone());
-      stp(src1, src0, MemOperand(StackPointer(), -2 * size, PreIndex));
-      break;
-    case 3:
-      ASSERT(src3.IsNone());
-      stp(src2, src1, MemOperand(StackPointer(), -3 * size, PreIndex));
-      str(src0, MemOperand(StackPointer(), 2 * size));
-      break;
-    case 4:
-      // Skip over 4 * size, then fill in the gap. This allows four W registers
-      // to be pushed using csp, whilst maintaining 16-byte alignment for csp
-      // at all times.
-      stp(src3, src2, MemOperand(StackPointer(), -4 * size, PreIndex));
-      stp(src1, src0, MemOperand(StackPointer(), 2 * size));
-      break;
-    default:
-      UNREACHABLE();
-  }
-}
-
-
-void MacroAssembler::PopHelper(int count, int size,
-                               const CPURegister& dst0,
-                               const CPURegister& dst1,
-                               const CPURegister& dst2,
-                               const CPURegister& dst3) {
-  // Ensure that we don't unintentially modify scratch or debug registers.
-  InstructionAccurateScope scope(this);
-
-  ASSERT(AreSameSizeAndType(dst0, dst1, dst2, dst3));
-  ASSERT(size == dst0.SizeInBytes());
-
-  // When popping multiple registers, the load order is chosen such that
-  // Pop(a, b) is equivalent to Pop(a) followed by Pop(b).
-  switch (count) {
-    case 1:
-      ASSERT(dst1.IsNone() && dst2.IsNone() && dst3.IsNone());
-      ldr(dst0, MemOperand(StackPointer(), 1 * size, PostIndex));
-      break;
-    case 2:
-      ASSERT(dst2.IsNone() && dst3.IsNone());
-      ldp(dst0, dst1, MemOperand(StackPointer(), 2 * size, PostIndex));
-      break;
-    case 3:
-      ASSERT(dst3.IsNone());
-      ldr(dst2, MemOperand(StackPointer(), 2 * size));
-      ldp(dst0, dst1, MemOperand(StackPointer(), 3 * size, PostIndex));
-      break;
-    case 4:
-      // Load the higher addresses first, then load the lower addresses and
-      // skip the whole block in the second instruction. This allows four W
-      // registers to be popped using csp, whilst maintaining 16-byte alignment
-      // for csp at all times.
-      ldp(dst2, dst3, MemOperand(StackPointer(), 2 * size));
-      ldp(dst0, dst1, MemOperand(StackPointer(), 4 * size, PostIndex));
-      break;
-    default:
-      UNREACHABLE();
-  }
-}
-
-
-void MacroAssembler::PrepareForPush(Operand total_size) {
-  // TODO(jbramley): This assertion generates too much code in some debug tests.
-  // AssertStackConsistency();
-  if (csp.Is(StackPointer())) {
-    // If the current stack pointer is csp, then it must be aligned to 16 bytes
-    // on entry and the total size of the specified registers must also be a
-    // multiple of 16 bytes.
-    if (total_size.IsImmediate()) {
-      ASSERT((total_size.immediate() % 16) == 0);
-    }
-
-    // Don't check access size for non-immediate sizes. It's difficult to do
-    // well, and it will be caught by hardware (or the simulator) anyway.
-  } else {
-    // Even if the current stack pointer is not the system stack pointer (csp),
-    // the system stack pointer will still be modified in order to comply with
-    // ABI rules about accessing memory below the system stack pointer.
-    BumpSystemStackPointer(total_size);
-  }
-}
-
-
-void MacroAssembler::PrepareForPop(Operand total_size) {
-  AssertStackConsistency();
-  if (csp.Is(StackPointer())) {
-    // If the current stack pointer is csp, then it must be aligned to 16 bytes
-    // on entry and the total size of the specified registers must also be a
-    // multiple of 16 bytes.
-    if (total_size.IsImmediate()) {
-      ASSERT((total_size.immediate() % 16) == 0);
-    }
-
-    // Don't check access size for non-immediate sizes. It's difficult to do
-    // well, and it will be caught by hardware (or the simulator) anyway.
-  }
-}
-
-
-void MacroAssembler::Poke(const CPURegister& src, const Operand& offset) {
-  if (offset.IsImmediate()) {
-    ASSERT(offset.immediate() >= 0);
-  } else if (emit_debug_code()) {
-    Cmp(xzr, offset);
-    Check(le, kStackAccessBelowStackPointer);
-  }
-
-  Str(src, MemOperand(StackPointer(), offset));
-}
-
-
-void MacroAssembler::Peek(const CPURegister& dst, const Operand& offset) {
-  if (offset.IsImmediate()) {
-    ASSERT(offset.immediate() >= 0);
-  } else if (emit_debug_code()) {
-    Cmp(xzr, offset);
-    Check(le, kStackAccessBelowStackPointer);
-  }
-
-  Ldr(dst, MemOperand(StackPointer(), offset));
-}
-
-
-void MacroAssembler::PokePair(const CPURegister& src1,
-                              const CPURegister& src2,
-                              int offset) {
-  ASSERT(AreSameSizeAndType(src1, src2));
-  ASSERT((offset >= 0) && ((offset % src1.SizeInBytes()) == 0));
-  Stp(src1, src2, MemOperand(StackPointer(), offset));
-}
-
-
-void MacroAssembler::PeekPair(const CPURegister& dst1,
-                              const CPURegister& dst2,
-                              int offset) {
-  ASSERT(AreSameSizeAndType(dst1, dst2));
-  ASSERT((offset >= 0) && ((offset % dst1.SizeInBytes()) == 0));
-  Ldp(dst1, dst2, MemOperand(StackPointer(), offset));
-}
-
-
-void MacroAssembler::PushCalleeSavedRegisters() {
-  // Ensure that the macro-assembler doesn't use any scratch registers.
-  InstructionAccurateScope scope(this);
-
-  // This method must not be called unless the current stack pointer is the
-  // system stack pointer (csp).
-  ASSERT(csp.Is(StackPointer()));
-
-  MemOperand tos(csp, -2 * kXRegSize, PreIndex);
-
-  stp(d14, d15, tos);
-  stp(d12, d13, tos);
-  stp(d10, d11, tos);
-  stp(d8, d9, tos);
-
-  stp(x29, x30, tos);
-  stp(x27, x28, tos);    // x28 = jssp
-  stp(x25, x26, tos);
-  stp(x23, x24, tos);
-  stp(x21, x22, tos);
-  stp(x19, x20, tos);
-}
-
-
-void MacroAssembler::PopCalleeSavedRegisters() {
-  // Ensure that the macro-assembler doesn't use any scratch registers.
-  InstructionAccurateScope scope(this);
-
-  // This method must not be called unless the current stack pointer is the
-  // system stack pointer (csp).
-  ASSERT(csp.Is(StackPointer()));
-
-  MemOperand tos(csp, 2 * kXRegSize, PostIndex);
-
-  ldp(x19, x20, tos);
-  ldp(x21, x22, tos);
-  ldp(x23, x24, tos);
-  ldp(x25, x26, tos);
-  ldp(x27, x28, tos);    // x28 = jssp
-  ldp(x29, x30, tos);
-
-  ldp(d8, d9, tos);
-  ldp(d10, d11, tos);
-  ldp(d12, d13, tos);
-  ldp(d14, d15, tos);
-}
-
-
-void MacroAssembler::AssertStackConsistency() {
-  if (emit_debug_code()) {
-    if (csp.Is(StackPointer())) {
-      // We can't check the alignment of csp without using a scratch register
-      // (or clobbering the flags), but the processor (or simulator) will abort
-      // if it is not properly aligned during a load.
-      ldr(xzr, MemOperand(csp, 0));
-    } else if (FLAG_enable_slow_asserts) {
-      Label ok;
-      // Check that csp <= StackPointer(), preserving all registers and NZCV.
-      sub(StackPointer(), csp, StackPointer());
-      cbz(StackPointer(), &ok);                 // Ok if csp == StackPointer().
-      tbnz(StackPointer(), kXSignBit, &ok);     // Ok if csp < StackPointer().
-
-      Abort(kTheCurrentStackPointerIsBelowCsp);
-
-      bind(&ok);
-      // Restore StackPointer().
-      sub(StackPointer(), csp, StackPointer());
-    }
-  }
-}
-
-
-void MacroAssembler::LoadRoot(Register destination,
-                              Heap::RootListIndex index) {
-  // TODO(jbramley): Most root values are constants, and can be synthesized
-  // without a load. Refer to the ARM back end for details.
-  Ldr(destination, MemOperand(root, index << kPointerSizeLog2));
-}
-
-
-void MacroAssembler::StoreRoot(Register source,
-                               Heap::RootListIndex index) {
-  Str(source, MemOperand(root, index << kPointerSizeLog2));
-}
-
-
-void MacroAssembler::LoadTrueFalseRoots(Register true_root,
-                                        Register false_root) {
-  STATIC_ASSERT((Heap::kTrueValueRootIndex + 1) == Heap::kFalseValueRootIndex);
-  Ldp(true_root, false_root,
-      MemOperand(root, Heap::kTrueValueRootIndex << kPointerSizeLog2));
-}
-
-
-void MacroAssembler::LoadHeapObject(Register result,
-                                    Handle<HeapObject> object) {
-  AllowDeferredHandleDereference using_raw_address;
-  if (isolate()->heap()->InNewSpace(*object)) {
-    Handle<Cell> cell = isolate()->factory()->NewCell(object);
-    Mov(result, Operand(cell));
-    Ldr(result, FieldMemOperand(result, Cell::kValueOffset));
-  } else {
-    Mov(result, Operand(object));
-  }
-}
-
-
-void MacroAssembler::LoadInstanceDescriptors(Register map,
-                                             Register descriptors) {
-  Ldr(descriptors, FieldMemOperand(map, Map::kDescriptorsOffset));
-}
-
-
-void MacroAssembler::NumberOfOwnDescriptors(Register dst, Register map) {
-  Ldr(dst, FieldMemOperand(map, Map::kBitField3Offset));
-  DecodeField<Map::NumberOfOwnDescriptorsBits>(dst);
-}
-
-
-void MacroAssembler::EnumLengthUntagged(Register dst, Register map) {
-  STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
-  Ldrsw(dst, UntagSmiFieldMemOperand(map, Map::kBitField3Offset));
-  And(dst, dst, Map::EnumLengthBits::kMask);
-}
-
-
-void MacroAssembler::EnumLengthSmi(Register dst, Register map) {
-  STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
-  Ldr(dst, FieldMemOperand(map, Map::kBitField3Offset));
-  And(dst, dst, Smi::FromInt(Map::EnumLengthBits::kMask));
-}
-
-
-void MacroAssembler::CheckEnumCache(Register object,
-                                    Register null_value,
-                                    Register scratch0,
-                                    Register scratch1,
-                                    Register scratch2,
-                                    Register scratch3,
-                                    Label* call_runtime) {
-  ASSERT(!AreAliased(object, null_value, scratch0, scratch1, scratch2,
-                     scratch3));
-
-  Register empty_fixed_array_value = scratch0;
-  Register current_object = scratch1;
-
-  LoadRoot(empty_fixed_array_value, Heap::kEmptyFixedArrayRootIndex);
-  Label next, start;
-
-  Mov(current_object, object);
-
-  // Check if the enum length field is properly initialized, indicating that
-  // there is an enum cache.
-  Register map = scratch2;
-  Register enum_length = scratch3;
-  Ldr(map, FieldMemOperand(current_object, HeapObject::kMapOffset));
-
-  EnumLengthUntagged(enum_length, map);
-  Cmp(enum_length, kInvalidEnumCacheSentinel);
-  B(eq, call_runtime);
-
-  B(&start);
-
-  Bind(&next);
-  Ldr(map, FieldMemOperand(current_object, HeapObject::kMapOffset));
-
-  // For all objects but the receiver, check that the cache is empty.
-  EnumLengthUntagged(enum_length, map);
-  Cbnz(enum_length, call_runtime);
-
-  Bind(&start);
-
-  // Check that there are no elements. Register current_object contains the
-  // current JS object we've reached through the prototype chain.
-  Label no_elements;
-  Ldr(current_object, FieldMemOperand(current_object,
-                                      JSObject::kElementsOffset));
-  Cmp(current_object, empty_fixed_array_value);
-  B(eq, &no_elements);
-
-  // Second chance, the object may be using the empty slow element dictionary.
-  CompareRoot(current_object, Heap::kEmptySlowElementDictionaryRootIndex);
-  B(ne, call_runtime);
-
-  Bind(&no_elements);
-  Ldr(current_object, FieldMemOperand(map, Map::kPrototypeOffset));
-  Cmp(current_object, null_value);
-  B(ne, &next);
-}
-
-
-void MacroAssembler::TestJSArrayForAllocationMemento(Register receiver,
-                                                     Register scratch1,
-                                                     Register scratch2,
-                                                     Label* no_memento_found) {
-  ExternalReference new_space_start =
-      ExternalReference::new_space_start(isolate());
-  ExternalReference new_space_allocation_top =
-      ExternalReference::new_space_allocation_top_address(isolate());
-
-  Add(scratch1, receiver,
-      JSArray::kSize + AllocationMemento::kSize - kHeapObjectTag);
-  Cmp(scratch1, new_space_start);
-  B(lt, no_memento_found);
-
-  Mov(scratch2, new_space_allocation_top);
-  Ldr(scratch2, MemOperand(scratch2));
-  Cmp(scratch1, scratch2);
-  B(gt, no_memento_found);
-
-  Ldr(scratch1, MemOperand(scratch1, -AllocationMemento::kSize));
-  Cmp(scratch1,
-      Operand(isolate()->factory()->allocation_memento_map()));
-}
-
-
-void MacroAssembler::JumpToHandlerEntry(Register exception,
-                                        Register object,
-                                        Register state,
-                                        Register scratch1,
-                                        Register scratch2) {
-  // Handler expects argument in x0.
-  ASSERT(exception.Is(x0));
-
-  // Compute the handler entry address and jump to it. The handler table is
-  // a fixed array of (smi-tagged) code offsets.
-  Ldr(scratch1, FieldMemOperand(object, Code::kHandlerTableOffset));
-  Add(scratch1, scratch1, FixedArray::kHeaderSize - kHeapObjectTag);
-  STATIC_ASSERT(StackHandler::kKindWidth < kPointerSizeLog2);
-  Lsr(scratch2, state, StackHandler::kKindWidth);
-  Ldr(scratch2, MemOperand(scratch1, scratch2, LSL, kPointerSizeLog2));
-  Add(scratch1, object, Code::kHeaderSize - kHeapObjectTag);
-  Add(scratch1, scratch1, Operand::UntagSmi(scratch2));
-  Br(scratch1);
-}
-
-
-void MacroAssembler::InNewSpace(Register object,
-                                Condition cond,
-                                Label* branch) {
-  ASSERT(cond == eq || cond == ne);
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireX();
-  And(temp, object, ExternalReference::new_space_mask(isolate()));
-  Cmp(temp, ExternalReference::new_space_start(isolate()));
-  B(cond, branch);
-}
-
-
-void MacroAssembler::Throw(Register value,
-                           Register scratch1,
-                           Register scratch2,
-                           Register scratch3,
-                           Register scratch4) {
-  // Adjust this code if not the case.
-  STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
-  STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
-
-  // The handler expects the exception in x0.
-  ASSERT(value.Is(x0));
-
-  // Drop the stack pointer to the top of the top handler.
-  ASSERT(jssp.Is(StackPointer()));
-  Mov(scratch1, Operand(ExternalReference(Isolate::kHandlerAddress,
-                                          isolate())));
-  Ldr(jssp, MemOperand(scratch1));
-  // Restore the next handler.
-  Pop(scratch2);
-  Str(scratch2, MemOperand(scratch1));
-
-  // Get the code object and state.  Restore the context and frame pointer.
-  Register object = scratch1;
-  Register state = scratch2;
-  Pop(object, state, cp, fp);
-
-  // If the handler is a JS frame, restore the context to the frame.
-  // (kind == ENTRY) == (fp == 0) == (cp == 0), so we could test either fp
-  // or cp.
-  Label not_js_frame;
-  Cbz(cp, &not_js_frame);
-  Str(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
-  Bind(&not_js_frame);
-
-  JumpToHandlerEntry(value, object, state, scratch3, scratch4);
-}
-
-
-void MacroAssembler::ThrowUncatchable(Register value,
-                                      Register scratch1,
-                                      Register scratch2,
-                                      Register scratch3,
-                                      Register scratch4) {
-  // Adjust this code if not the case.
-  STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
-
-  // The handler expects the exception in x0.
-  ASSERT(value.Is(x0));
-
-  // Drop the stack pointer to the top of the top stack handler.
-  ASSERT(jssp.Is(StackPointer()));
-  Mov(scratch1, Operand(ExternalReference(Isolate::kHandlerAddress,
-                                          isolate())));
-  Ldr(jssp, MemOperand(scratch1));
-
-  // Unwind the handlers until the ENTRY handler is found.
-  Label fetch_next, check_kind;
-  B(&check_kind);
-  Bind(&fetch_next);
-  Peek(jssp, StackHandlerConstants::kNextOffset);
-
-  Bind(&check_kind);
-  STATIC_ASSERT(StackHandler::JS_ENTRY == 0);
-  Peek(scratch2, StackHandlerConstants::kStateOffset);
-  TestAndBranchIfAnySet(scratch2, StackHandler::KindField::kMask, &fetch_next);
-
-  // Set the top handler address to next handler past the top ENTRY handler.
-  Pop(scratch2);
-  Str(scratch2, MemOperand(scratch1));
-
-  // Get the code object and state.  Clear the context and frame pointer (0 was
-  // saved in the handler).
-  Register object = scratch1;
-  Register state = scratch2;
-  Pop(object, state, cp, fp);
-
-  JumpToHandlerEntry(value, object, state, scratch3, scratch4);
-}
-
-
-void MacroAssembler::Throw(BailoutReason reason) {
-  Label throw_start;
-  Bind(&throw_start);
-#ifdef DEBUG
-  const char* msg = GetBailoutReason(reason);
-  RecordComment("Throw message: ");
-  RecordComment((msg != NULL) ? msg : "UNKNOWN");
-#endif
-
-  Mov(x0, Smi::FromInt(reason));
-  Push(x0);
-
-  // Disable stub call restrictions to always allow calls to throw.
-  if (!has_frame_) {
-    // We don't actually want to generate a pile of code for this, so just
-    // claim there is a stack frame, without generating one.
-    FrameScope scope(this, StackFrame::NONE);
-    CallRuntime(Runtime::kThrowMessage, 1);
-  } else {
-    CallRuntime(Runtime::kThrowMessage, 1);
-  }
-  // ThrowMessage should not return here.
-  Unreachable();
-}
-
-
-void MacroAssembler::ThrowIf(Condition cc, BailoutReason reason) {
-  Label ok;
-  B(InvertCondition(cc), &ok);
-  Throw(reason);
-  Bind(&ok);
-}
-
-
-void MacroAssembler::ThrowIfSmi(const Register& value, BailoutReason reason) {
-  Label ok;
-  JumpIfNotSmi(value, &ok);
-  Throw(reason);
-  Bind(&ok);
-}
-
-
-void MacroAssembler::SmiAbs(const Register& smi, Label* slow) {
-  ASSERT(smi.Is64Bits());
-  Abs(smi, smi, slow);
-}
-
-
-void MacroAssembler::AssertSmi(Register object, BailoutReason reason) {
-  if (emit_debug_code()) {
-    STATIC_ASSERT(kSmiTag == 0);
-    Tst(object, kSmiTagMask);
-    Check(eq, reason);
-  }
-}
-
-
-void MacroAssembler::AssertNotSmi(Register object, BailoutReason reason) {
-  if (emit_debug_code()) {
-    STATIC_ASSERT(kSmiTag == 0);
-    Tst(object, kSmiTagMask);
-    Check(ne, reason);
-  }
-}
-
-
-void MacroAssembler::AssertName(Register object) {
-  if (emit_debug_code()) {
-    AssertNotSmi(object, kOperandIsASmiAndNotAName);
-
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireX();
-
-    Ldr(temp, FieldMemOperand(object, HeapObject::kMapOffset));
-    CompareInstanceType(temp, temp, LAST_NAME_TYPE);
-    Check(ls, kOperandIsNotAName);
-  }
-}
-
-
-void MacroAssembler::AssertUndefinedOrAllocationSite(Register object,
-                                                     Register scratch) {
-  if (emit_debug_code()) {
-    Label done_checking;
-    AssertNotSmi(object);
-    JumpIfRoot(object, Heap::kUndefinedValueRootIndex, &done_checking);
-    Ldr(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
-    CompareRoot(scratch, Heap::kAllocationSiteMapRootIndex);
-    Assert(eq, kExpectedUndefinedOrCell);
-    Bind(&done_checking);
-  }
-}
-
-
-void MacroAssembler::AssertString(Register object) {
-  if (emit_debug_code()) {
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireX();
-    STATIC_ASSERT(kSmiTag == 0);
-    Tst(object, kSmiTagMask);
-    Check(ne, kOperandIsASmiAndNotAString);
-    Ldr(temp, FieldMemOperand(object, HeapObject::kMapOffset));
-    CompareInstanceType(temp, temp, FIRST_NONSTRING_TYPE);
-    Check(lo, kOperandIsNotAString);
-  }
-}
-
-
-void MacroAssembler::CallStub(CodeStub* stub, TypeFeedbackId ast_id) {
-  ASSERT(AllowThisStubCall(stub));  // Stub calls are not allowed in some stubs.
-  Call(stub->GetCode(isolate()), RelocInfo::CODE_TARGET, ast_id);
-}
-
-
-void MacroAssembler::TailCallStub(CodeStub* stub) {
-  Jump(stub->GetCode(isolate()), RelocInfo::CODE_TARGET);
-}
-
-
-void MacroAssembler::CallRuntime(const Runtime::Function* f,
-                                 int num_arguments,
-                                 SaveFPRegsMode save_doubles) {
-  // All arguments must be on the stack before this function is called.
-  // x0 holds the return value after the call.
-
-  // Check that the number of arguments matches what the function expects.
-  // If f->nargs is -1, the function can accept a variable number of arguments.
-  if (f->nargs >= 0 && f->nargs != num_arguments) {
-    // Illegal operation: drop the stack arguments and return undefined.
-    if (num_arguments > 0) {
-      Drop(num_arguments);
-    }
-    LoadRoot(x0, Heap::kUndefinedValueRootIndex);
-    return;
-  }
-
-  // Place the necessary arguments.
-  Mov(x0, num_arguments);
-  Mov(x1, ExternalReference(f, isolate()));
-
-  CEntryStub stub(1, save_doubles);
-  CallStub(&stub);
-}
-
-
-static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
-  return ref0.address() - ref1.address();
-}
-
-
-void MacroAssembler::CallApiFunctionAndReturn(
-    Register function_address,
-    ExternalReference thunk_ref,
-    int stack_space,
-    int spill_offset,
-    MemOperand return_value_operand,
-    MemOperand* context_restore_operand) {
-  ASM_LOCATION("CallApiFunctionAndReturn");
-  ExternalReference next_address =
-      ExternalReference::handle_scope_next_address(isolate());
-  const int kNextOffset = 0;
-  const int kLimitOffset = AddressOffset(
-      ExternalReference::handle_scope_limit_address(isolate()),
-      next_address);
-  const int kLevelOffset = AddressOffset(
-      ExternalReference::handle_scope_level_address(isolate()),
-      next_address);
-
-  ASSERT(function_address.is(x1) || function_address.is(x2));
-
-  Label profiler_disabled;
-  Label end_profiler_check;
-  bool* is_profiling_flag = isolate()->cpu_profiler()->is_profiling_address();
-  STATIC_ASSERT(sizeof(*is_profiling_flag) == 1);
-  Mov(x10, reinterpret_cast<uintptr_t>(is_profiling_flag));
-  Ldrb(w10, MemOperand(x10));
-  Cbz(w10, &profiler_disabled);
-  Mov(x3, thunk_ref);
-  B(&end_profiler_check);
-
-  Bind(&profiler_disabled);
-  Mov(x3, function_address);
-  Bind(&end_profiler_check);
-
-  // Save the callee-save registers we are going to use.
-  // TODO(all): Is this necessary? ARM doesn't do it.
-  STATIC_ASSERT(kCallApiFunctionSpillSpace == 4);
-  Poke(x19, (spill_offset + 0) * kXRegSize);
-  Poke(x20, (spill_offset + 1) * kXRegSize);
-  Poke(x21, (spill_offset + 2) * kXRegSize);
-  Poke(x22, (spill_offset + 3) * kXRegSize);
-
-  // Allocate HandleScope in callee-save registers.
-  // We will need to restore the HandleScope after the call to the API function,
-  // by allocating it in callee-save registers they will be preserved by C code.
-  Register handle_scope_base = x22;
-  Register next_address_reg = x19;
-  Register limit_reg = x20;
-  Register level_reg = w21;
-
-  Mov(handle_scope_base, next_address);
-  Ldr(next_address_reg, MemOperand(handle_scope_base, kNextOffset));
-  Ldr(limit_reg, MemOperand(handle_scope_base, kLimitOffset));
-  Ldr(level_reg, MemOperand(handle_scope_base, kLevelOffset));
-  Add(level_reg, level_reg, 1);
-  Str(level_reg, MemOperand(handle_scope_base, kLevelOffset));
-
-  if (FLAG_log_timer_events) {
-    FrameScope frame(this, StackFrame::MANUAL);
-    PushSafepointRegisters();
-    Mov(x0, ExternalReference::isolate_address(isolate()));
-    CallCFunction(ExternalReference::log_enter_external_function(isolate()), 1);
-    PopSafepointRegisters();
-  }
-
-  // Native call returns to the DirectCEntry stub which redirects to the
-  // return address pushed on stack (could have moved after GC).
-  // DirectCEntry stub itself is generated early and never moves.
-  DirectCEntryStub stub;
-  stub.GenerateCall(this, x3);
-
-  if (FLAG_log_timer_events) {
-    FrameScope frame(this, StackFrame::MANUAL);
-    PushSafepointRegisters();
-    Mov(x0, ExternalReference::isolate_address(isolate()));
-    CallCFunction(ExternalReference::log_leave_external_function(isolate()), 1);
-    PopSafepointRegisters();
-  }
-
-  Label promote_scheduled_exception;
-  Label exception_handled;
-  Label delete_allocated_handles;
-  Label leave_exit_frame;
-  Label return_value_loaded;
-
-  // Load value from ReturnValue.
-  Ldr(x0, return_value_operand);
-  Bind(&return_value_loaded);
-  // No more valid handles (the result handle was the last one). Restore
-  // previous handle scope.
-  Str(next_address_reg, MemOperand(handle_scope_base, kNextOffset));
-  if (emit_debug_code()) {
-    Ldr(w1, MemOperand(handle_scope_base, kLevelOffset));
-    Cmp(w1, level_reg);
-    Check(eq, kUnexpectedLevelAfterReturnFromApiCall);
-  }
-  Sub(level_reg, level_reg, 1);
-  Str(level_reg, MemOperand(handle_scope_base, kLevelOffset));
-  Ldr(x1, MemOperand(handle_scope_base, kLimitOffset));
-  Cmp(limit_reg, x1);
-  B(ne, &delete_allocated_handles);
-
-  Bind(&leave_exit_frame);
-  // Restore callee-saved registers.
-  Peek(x19, (spill_offset + 0) * kXRegSize);
-  Peek(x20, (spill_offset + 1) * kXRegSize);
-  Peek(x21, (spill_offset + 2) * kXRegSize);
-  Peek(x22, (spill_offset + 3) * kXRegSize);
-
-  // Check if the function scheduled an exception.
-  Mov(x5, ExternalReference::scheduled_exception_address(isolate()));
-  Ldr(x5, MemOperand(x5));
-  JumpIfNotRoot(x5, Heap::kTheHoleValueRootIndex, &promote_scheduled_exception);
-  Bind(&exception_handled);
-
-  bool restore_context = context_restore_operand != NULL;
-  if (restore_context) {
-    Ldr(cp, *context_restore_operand);
-  }
-
-  LeaveExitFrame(false, x1, !restore_context);
-  Drop(stack_space);
-  Ret();
-
-  Bind(&promote_scheduled_exception);
-  {
-    FrameScope frame(this, StackFrame::INTERNAL);
-    CallExternalReference(
-        ExternalReference(Runtime::kPromoteScheduledException, isolate()), 0);
-  }
-  B(&exception_handled);
-
-  // HandleScope limit has changed. Delete allocated extensions.
-  Bind(&delete_allocated_handles);
-  Str(limit_reg, MemOperand(handle_scope_base, kLimitOffset));
-  // Save the return value in a callee-save register.
-  Register saved_result = x19;
-  Mov(saved_result, x0);
-  Mov(x0, ExternalReference::isolate_address(isolate()));
-  CallCFunction(
-      ExternalReference::delete_handle_scope_extensions(isolate()), 1);
-  Mov(x0, saved_result);
-  B(&leave_exit_frame);
-}
-
-
-void MacroAssembler::CallExternalReference(const ExternalReference& ext,
-                                           int num_arguments) {
-  Mov(x0, num_arguments);
-  Mov(x1, ext);
-
-  CEntryStub stub(1);
-  CallStub(&stub);
-}
-
-
-void MacroAssembler::JumpToExternalReference(const ExternalReference& builtin) {
-  Mov(x1, builtin);
-  CEntryStub stub(1);
-  Jump(stub.GetCode(isolate()), RelocInfo::CODE_TARGET);
-}
-
-
-void MacroAssembler::GetBuiltinFunction(Register target,
-                                        Builtins::JavaScript id) {
-  // Load the builtins object into target register.
-  Ldr(target, GlobalObjectMemOperand());
-  Ldr(target, FieldMemOperand(target, GlobalObject::kBuiltinsOffset));
-  // Load the JavaScript builtin function from the builtins object.
-  Ldr(target, FieldMemOperand(target,
-                          JSBuiltinsObject::OffsetOfFunctionWithId(id)));
-}
-
-
-void MacroAssembler::GetBuiltinEntry(Register target,
-                                     Register function,
-                                     Builtins::JavaScript id) {
-  ASSERT(!AreAliased(target, function));
-  GetBuiltinFunction(function, id);
-  // Load the code entry point from the builtins object.
-  Ldr(target, FieldMemOperand(function, JSFunction::kCodeEntryOffset));
-}
-
-
-void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id,
-                                   InvokeFlag flag,
-                                   const CallWrapper& call_wrapper) {
-  ASM_LOCATION("MacroAssembler::InvokeBuiltin");
-  // You can't call a builtin without a valid frame.
-  ASSERT(flag == JUMP_FUNCTION || has_frame());
-
-  // Get the builtin entry in x2 and setup the function object in x1.
-  GetBuiltinEntry(x2, x1, id);
-  if (flag == CALL_FUNCTION) {
-    call_wrapper.BeforeCall(CallSize(x2));
-    Call(x2);
-    call_wrapper.AfterCall();
-  } else {
-    ASSERT(flag == JUMP_FUNCTION);
-    Jump(x2);
-  }
-}
-
-
-void MacroAssembler::TailCallExternalReference(const ExternalReference& ext,
-                                               int num_arguments,
-                                               int result_size) {
-  // TODO(1236192): Most runtime routines don't need the number of
-  // arguments passed in because it is constant. At some point we
-  // should remove this need and make the runtime routine entry code
-  // smarter.
-  Mov(x0, num_arguments);
-  JumpToExternalReference(ext);
-}
-
-
-void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid,
-                                     int num_arguments,
-                                     int result_size) {
-  TailCallExternalReference(ExternalReference(fid, isolate()),
-                            num_arguments,
-                            result_size);
-}
-
-
-void MacroAssembler::InitializeNewString(Register string,
-                                         Register length,
-                                         Heap::RootListIndex map_index,
-                                         Register scratch1,
-                                         Register scratch2) {
-  ASSERT(!AreAliased(string, length, scratch1, scratch2));
-  LoadRoot(scratch2, map_index);
-  SmiTag(scratch1, length);
-  Str(scratch2, FieldMemOperand(string, HeapObject::kMapOffset));
-
-  Mov(scratch2, String::kEmptyHashField);
-  Str(scratch1, FieldMemOperand(string, String::kLengthOffset));
-  Str(scratch2, FieldMemOperand(string, String::kHashFieldOffset));
-}
-
-
-int MacroAssembler::ActivationFrameAlignment() {
-#if V8_HOST_ARCH_A64
-  // Running on the real platform. Use the alignment as mandated by the local
-  // environment.
-  // Note: This will break if we ever start generating snapshots on one ARM
-  // platform for another ARM platform with a different alignment.
-  return OS::ActivationFrameAlignment();
-#else  // V8_HOST_ARCH_A64
-  // If we are using the simulator then we should always align to the expected
-  // alignment. As the simulator is used to generate snapshots we do not know
-  // if the target platform will need alignment, so this is controlled from a
-  // flag.
-  return FLAG_sim_stack_alignment;
-#endif  // V8_HOST_ARCH_A64
-}
-
-
-void MacroAssembler::CallCFunction(ExternalReference function,
-                                   int num_of_reg_args) {
-  CallCFunction(function, num_of_reg_args, 0);
-}
-
-
-void MacroAssembler::CallCFunction(ExternalReference function,
-                                   int num_of_reg_args,
-                                   int num_of_double_args) {
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireX();
-  Mov(temp, function);
-  CallCFunction(temp, num_of_reg_args, num_of_double_args);
-}
-
-
-void MacroAssembler::CallCFunction(Register function,
-                                   int num_of_reg_args,
-                                   int num_of_double_args) {
-  ASSERT(has_frame());
-  // We can pass 8 integer arguments in registers. If we need to pass more than
-  // that, we'll need to implement support for passing them on the stack.
-  ASSERT(num_of_reg_args <= 8);
-
-  // If we're passing doubles, we're limited to the following prototypes
-  // (defined by ExternalReference::Type):
-  //  BUILTIN_COMPARE_CALL:  int f(double, double)
-  //  BUILTIN_FP_FP_CALL:    double f(double, double)
-  //  BUILTIN_FP_CALL:       double f(double)
-  //  BUILTIN_FP_INT_CALL:   double f(double, int)
-  if (num_of_double_args > 0) {
-    ASSERT(num_of_reg_args <= 1);
-    ASSERT((num_of_double_args + num_of_reg_args) <= 2);
-  }
-
-
-  // If the stack pointer is not csp, we need to derive an aligned csp from the
-  // current stack pointer.
-  const Register old_stack_pointer = StackPointer();
-  if (!csp.Is(old_stack_pointer)) {
-    AssertStackConsistency();
-
-    int sp_alignment = ActivationFrameAlignment();
-    // The ABI mandates at least 16-byte alignment.
-    ASSERT(sp_alignment >= 16);
-    ASSERT(IsPowerOf2(sp_alignment));
-
-    // The current stack pointer is a callee saved register, and is preserved
-    // across the call.
-    ASSERT(kCalleeSaved.IncludesAliasOf(old_stack_pointer));
-
-    // Align and synchronize the system stack pointer with jssp.
-    Bic(csp, old_stack_pointer, sp_alignment - 1);
-    SetStackPointer(csp);
-  }
-
-  // Call directly. The function called cannot cause a GC, or allow preemption,
-  // so the return address in the link register stays correct.
-  Call(function);
-
-  if (!csp.Is(old_stack_pointer)) {
-    if (emit_debug_code()) {
-      // Because the stack pointer must be aligned on a 16-byte boundary, the
-      // aligned csp can be up to 12 bytes below the jssp. This is the case
-      // where we only pushed one W register on top of an aligned jssp.
-      UseScratchRegisterScope temps(this);
-      Register temp = temps.AcquireX();
-      ASSERT(ActivationFrameAlignment() == 16);
-      Sub(temp, csp, old_stack_pointer);
-      // We want temp <= 0 && temp >= -12.
-      Cmp(temp, 0);
-      Ccmp(temp, -12, NFlag, le);
-      Check(ge, kTheStackWasCorruptedByMacroAssemblerCall);
-    }
-    SetStackPointer(old_stack_pointer);
-  }
-}
-
-
-void MacroAssembler::Jump(Register target) {
-  Br(target);
-}
-
-
-void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode) {
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireX();
-  Mov(temp, Operand(target, rmode));
-  Br(temp);
-}
-
-
-void MacroAssembler::Jump(Address target, RelocInfo::Mode rmode) {
-  ASSERT(!RelocInfo::IsCodeTarget(rmode));
-  Jump(reinterpret_cast<intptr_t>(target), rmode);
-}
-
-
-void MacroAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode) {
-  ASSERT(RelocInfo::IsCodeTarget(rmode));
-  AllowDeferredHandleDereference embedding_raw_address;
-  Jump(reinterpret_cast<intptr_t>(code.location()), rmode);
-}
-
-
-void MacroAssembler::Call(Register target) {
-  BlockPoolsScope scope(this);
-#ifdef DEBUG
-  Label start_call;
-  Bind(&start_call);
-#endif
-
-  Blr(target);
-
-#ifdef DEBUG
-  AssertSizeOfCodeGeneratedSince(&start_call, CallSize(target));
-#endif
-}
-
-
-void MacroAssembler::Call(Label* target) {
-  BlockPoolsScope scope(this);
-#ifdef DEBUG
-  Label start_call;
-  Bind(&start_call);
-#endif
-
-  Bl(target);
-
-#ifdef DEBUG
-  AssertSizeOfCodeGeneratedSince(&start_call, CallSize(target));
-#endif
-}
-
-
-// MacroAssembler::CallSize is sensitive to changes in this function, as it
-// requires to know how many instructions are used to branch to the target.
-void MacroAssembler::Call(Address target, RelocInfo::Mode rmode) {
-  BlockPoolsScope scope(this);
-#ifdef DEBUG
-  Label start_call;
-  Bind(&start_call);
-#endif
-  // Statement positions are expected to be recorded when the target
-  // address is loaded.
-  positions_recorder()->WriteRecordedPositions();
-
-  // Addresses always have 64 bits, so we shouldn't encounter NONE32.
-  ASSERT(rmode != RelocInfo::NONE32);
-
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireX();
-
-  if (rmode == RelocInfo::NONE64) {
-    uint64_t imm = reinterpret_cast<uint64_t>(target);
-    movz(temp, (imm >> 0) & 0xffff, 0);
-    movk(temp, (imm >> 16) & 0xffff, 16);
-    movk(temp, (imm >> 32) & 0xffff, 32);
-    movk(temp, (imm >> 48) & 0xffff, 48);
-  } else {
-    LoadRelocated(temp, Operand(reinterpret_cast<intptr_t>(target), rmode));
-  }
-  Blr(temp);
-#ifdef DEBUG
-  AssertSizeOfCodeGeneratedSince(&start_call, CallSize(target, rmode));
-#endif
-}
-
-
-void MacroAssembler::Call(Handle<Code> code,
-                          RelocInfo::Mode rmode,
-                          TypeFeedbackId ast_id) {
-#ifdef DEBUG
-  Label start_call;
-  Bind(&start_call);
-#endif
-
-  if ((rmode == RelocInfo::CODE_TARGET) && (!ast_id.IsNone())) {
-    SetRecordedAstId(ast_id);
-    rmode = RelocInfo::CODE_TARGET_WITH_ID;
-  }
-
-  AllowDeferredHandleDereference embedding_raw_address;
-  Call(reinterpret_cast<Address>(code.location()), rmode);
-
-#ifdef DEBUG
-  // Check the size of the code generated.
-  AssertSizeOfCodeGeneratedSince(&start_call, CallSize(code, rmode, ast_id));
-#endif
-}
-
-
-int MacroAssembler::CallSize(Register target) {
-  USE(target);
-  return kInstructionSize;
-}
-
-
-int MacroAssembler::CallSize(Label* target) {
-  USE(target);
-  return kInstructionSize;
-}
-
-
-int MacroAssembler::CallSize(Address target, RelocInfo::Mode rmode) {
-  USE(target);
-
-  // Addresses always have 64 bits, so we shouldn't encounter NONE32.
-  ASSERT(rmode != RelocInfo::NONE32);
-
-  if (rmode == RelocInfo::NONE64) {
-    return kCallSizeWithoutRelocation;
-  } else {
-    return kCallSizeWithRelocation;
-  }
-}
-
-
-int MacroAssembler::CallSize(Handle<Code> code,
-                             RelocInfo::Mode rmode,
-                             TypeFeedbackId ast_id) {
-  USE(code);
-  USE(ast_id);
-
-  // Addresses always have 64 bits, so we shouldn't encounter NONE32.
-  ASSERT(rmode != RelocInfo::NONE32);
-
-  if (rmode == RelocInfo::NONE64) {
-    return kCallSizeWithoutRelocation;
-  } else {
-    return kCallSizeWithRelocation;
-  }
-}
-
-
-
-
-
-void MacroAssembler::JumpForHeapNumber(Register object,
-                                       Register heap_number_map,
-                                       Label* on_heap_number,
-                                       Label* on_not_heap_number) {
-  ASSERT(on_heap_number || on_not_heap_number);
-  AssertNotSmi(object);
-
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireX();
-
-  // Load the HeapNumber map if it is not passed.
-  if (heap_number_map.Is(NoReg)) {
-    heap_number_map = temps.AcquireX();
-    LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
-  } else {
-    AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
-  }
-
-  ASSERT(!AreAliased(temp, heap_number_map));
-
-  Ldr(temp, FieldMemOperand(object, HeapObject::kMapOffset));
-  Cmp(temp, heap_number_map);
-
-  if (on_heap_number) {
-    B(eq, on_heap_number);
-  }
-  if (on_not_heap_number) {
-    B(ne, on_not_heap_number);
-  }
-}
-
-
-void MacroAssembler::JumpIfHeapNumber(Register object,
-                                      Label* on_heap_number,
-                                      Register heap_number_map) {
-  JumpForHeapNumber(object,
-                    heap_number_map,
-                    on_heap_number,
-                    NULL);
-}
-
-
-void MacroAssembler::JumpIfNotHeapNumber(Register object,
-                                         Label* on_not_heap_number,
-                                         Register heap_number_map) {
-  JumpForHeapNumber(object,
-                    heap_number_map,
-                    NULL,
-                    on_not_heap_number);
-}
-
-
-void MacroAssembler::LookupNumberStringCache(Register object,
-                                             Register result,
-                                             Register scratch1,
-                                             Register scratch2,
-                                             Register scratch3,
-                                             Label* not_found) {
-  ASSERT(!AreAliased(object, result, scratch1, scratch2, scratch3));
-
-  // Use of registers. Register result is used as a temporary.
-  Register number_string_cache = result;
-  Register mask = scratch3;
-
-  // Load the number string cache.
-  LoadRoot(number_string_cache, Heap::kNumberStringCacheRootIndex);
-
-  // Make the hash mask from the length of the number string cache. It
-  // contains two elements (number and string) for each cache entry.
-  Ldrsw(mask, UntagSmiFieldMemOperand(number_string_cache,
-                                      FixedArray::kLengthOffset));
-  Asr(mask, mask, 1);  // Divide length by two.
-  Sub(mask, mask, 1);  // Make mask.
-
-  // Calculate the entry in the number string cache. The hash value in the
-  // number string cache for smis is just the smi value, and the hash for
-  // doubles is the xor of the upper and lower words. See
-  // Heap::GetNumberStringCache.
-  Label is_smi;
-  Label load_result_from_cache;
-
-  JumpIfSmi(object, &is_smi);
-  CheckMap(object, scratch1, Heap::kHeapNumberMapRootIndex, not_found,
-           DONT_DO_SMI_CHECK);
-
-  STATIC_ASSERT(kDoubleSize == (kWRegSize * 2));
-  Add(scratch1, object, HeapNumber::kValueOffset - kHeapObjectTag);
-  Ldp(scratch1.W(), scratch2.W(), MemOperand(scratch1));
-  Eor(scratch1, scratch1, scratch2);
-  And(scratch1, scratch1, mask);
-
-  // Calculate address of entry in string cache: each entry consists of two
-  // pointer sized fields.
-  Add(scratch1, number_string_cache,
-      Operand(scratch1, LSL, kPointerSizeLog2 + 1));
-
-  Register probe = mask;
-  Ldr(probe, FieldMemOperand(scratch1, FixedArray::kHeaderSize));
-  JumpIfSmi(probe, not_found);
-  Ldr(d0, FieldMemOperand(object, HeapNumber::kValueOffset));
-  Ldr(d1, FieldMemOperand(probe, HeapNumber::kValueOffset));
-  Fcmp(d0, d1);
-  B(ne, not_found);
-  B(&load_result_from_cache);
-
-  Bind(&is_smi);
-  Register scratch = scratch1;
-  And(scratch, mask, Operand::UntagSmi(object));
-  // Calculate address of entry in string cache: each entry consists
-  // of two pointer sized fields.
-  Add(scratch, number_string_cache,
-      Operand(scratch, LSL, kPointerSizeLog2 + 1));
-
-  // Check if the entry is the smi we are looking for.
-  Ldr(probe, FieldMemOperand(scratch, FixedArray::kHeaderSize));
-  Cmp(object, probe);
-  B(ne, not_found);
-
-  // Get the result from the cache.
-  Bind(&load_result_from_cache);
-  Ldr(result, FieldMemOperand(scratch, FixedArray::kHeaderSize + kPointerSize));
-  IncrementCounter(isolate()->counters()->number_to_string_native(), 1,
-                   scratch1, scratch2);
-}
-
-
-void MacroAssembler::TryConvertDoubleToInt(Register as_int,
-                                           FPRegister value,
-                                           FPRegister scratch_d,
-                                           Label* on_successful_conversion,
-                                           Label* on_failed_conversion) {
-  // Convert to an int and back again, then compare with the original value.
-  Fcvtzs(as_int, value);
-  Scvtf(scratch_d, as_int);
-  Fcmp(value, scratch_d);
-
-  if (on_successful_conversion) {
-    B(on_successful_conversion, eq);
-  }
-  if (on_failed_conversion) {
-    B(on_failed_conversion, ne);
-  }
-}
-
-
-void MacroAssembler::TestForMinusZero(DoubleRegister input) {
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireX();
-  // Floating point -0.0 is kMinInt as an integer, so subtracting 1 (cmp) will
-  // cause overflow.
-  Fmov(temp, input);
-  Cmp(temp, 1);
-}
-
-
-void MacroAssembler::JumpIfMinusZero(DoubleRegister input,
-                                     Label* on_negative_zero) {
-  TestForMinusZero(input);
-  B(vs, on_negative_zero);
-}
-
-
-void MacroAssembler::ClampInt32ToUint8(Register output, Register input) {
-  // Clamp the value to [0..255].
-  Cmp(input.W(), Operand(input.W(), UXTB));
-  // If input < input & 0xff, it must be < 0, so saturate to 0.
-  Csel(output.W(), wzr, input.W(), lt);
-  // If input <= input & 0xff, it must be <= 255. Otherwise, saturate to 255.
-  Csel(output.W(), output.W(), 255, le);
-}
-
-
-void MacroAssembler::ClampInt32ToUint8(Register in_out) {
-  ClampInt32ToUint8(in_out, in_out);
-}
-
-
-void MacroAssembler::ClampDoubleToUint8(Register output,
-                                        DoubleRegister input,
-                                        DoubleRegister dbl_scratch) {
-  // This conversion follows the WebIDL "[Clamp]" rules for PIXEL types:
-  //   - Inputs lower than 0 (including -infinity) produce 0.
-  //   - Inputs higher than 255 (including +infinity) produce 255.
-  // Also, it seems that PIXEL types use round-to-nearest rather than
-  // round-towards-zero.
-
-  // Squash +infinity before the conversion, since Fcvtnu will normally
-  // convert it to 0.
-  Fmov(dbl_scratch, 255);
-  Fmin(dbl_scratch, dbl_scratch, input);
-
-  // Convert double to unsigned integer. Values less than zero become zero.
-  // Values greater than 255 have already been clamped to 255.
-  Fcvtnu(output, dbl_scratch);
-}
-
-
-void MacroAssembler::CopyFieldsLoopPairsHelper(Register dst,
-                                               Register src,
-                                               unsigned count,
-                                               Register scratch1,
-                                               Register scratch2,
-                                               Register scratch3,
-                                               Register scratch4,
-                                               Register scratch5) {
-  // Untag src and dst into scratch registers.
-  // Copy src->dst in a tight loop.
-  ASSERT(!AreAliased(dst, src,
-                     scratch1, scratch2, scratch3, scratch4, scratch5));
-  ASSERT(count >= 2);
-
-  const Register& remaining = scratch3;
-  Mov(remaining, count / 2);
-
-  const Register& dst_untagged = scratch1;
-  const Register& src_untagged = scratch2;
-  Sub(dst_untagged, dst, kHeapObjectTag);
-  Sub(src_untagged, src, kHeapObjectTag);
-
-  // Copy fields in pairs.
-  Label loop;
-  Bind(&loop);
-  Ldp(scratch4, scratch5,
-      MemOperand(src_untagged, kXRegSize* 2, PostIndex));
-  Stp(scratch4, scratch5,
-      MemOperand(dst_untagged, kXRegSize* 2, PostIndex));
-  Sub(remaining, remaining, 1);
-  Cbnz(remaining, &loop);
-
-  // Handle the leftovers.
-  if (count & 1) {
-    Ldr(scratch4, MemOperand(src_untagged));
-    Str(scratch4, MemOperand(dst_untagged));
-  }
-}
-
-
-void MacroAssembler::CopyFieldsUnrolledPairsHelper(Register dst,
-                                                   Register src,
-                                                   unsigned count,
-                                                   Register scratch1,
-                                                   Register scratch2,
-                                                   Register scratch3,
-                                                   Register scratch4) {
-  // Untag src and dst into scratch registers.
-  // Copy src->dst in an unrolled loop.
-  ASSERT(!AreAliased(dst, src, scratch1, scratch2, scratch3, scratch4));
-
-  const Register& dst_untagged = scratch1;
-  const Register& src_untagged = scratch2;
-  sub(dst_untagged, dst, kHeapObjectTag);
-  sub(src_untagged, src, kHeapObjectTag);
-
-  // Copy fields in pairs.
-  for (unsigned i = 0; i < count / 2; i++) {
-    Ldp(scratch3, scratch4, MemOperand(src_untagged, kXRegSize * 2, PostIndex));
-    Stp(scratch3, scratch4, MemOperand(dst_untagged, kXRegSize * 2, PostIndex));
-  }
-
-  // Handle the leftovers.
-  if (count & 1) {
-    Ldr(scratch3, MemOperand(src_untagged));
-    Str(scratch3, MemOperand(dst_untagged));
-  }
-}
-
-
-void MacroAssembler::CopyFieldsUnrolledHelper(Register dst,
-                                              Register src,
-                                              unsigned count,
-                                              Register scratch1,
-                                              Register scratch2,
-                                              Register scratch3) {
-  // Untag src and dst into scratch registers.
-  // Copy src->dst in an unrolled loop.
-  ASSERT(!AreAliased(dst, src, scratch1, scratch2, scratch3));
-
-  const Register& dst_untagged = scratch1;
-  const Register& src_untagged = scratch2;
-  Sub(dst_untagged, dst, kHeapObjectTag);
-  Sub(src_untagged, src, kHeapObjectTag);
-
-  // Copy fields one by one.
-  for (unsigned i = 0; i < count; i++) {
-    Ldr(scratch3, MemOperand(src_untagged, kXRegSize, PostIndex));
-    Str(scratch3, MemOperand(dst_untagged, kXRegSize, PostIndex));
-  }
-}
-
-
-void MacroAssembler::CopyFields(Register dst, Register src, CPURegList temps,
-                                unsigned count) {
-  // One of two methods is used:
-  //
-  // For high 'count' values where many scratch registers are available:
-  //    Untag src and dst into scratch registers.
-  //    Copy src->dst in a tight loop.
-  //
-  // For low 'count' values or where few scratch registers are available:
-  //    Untag src and dst into scratch registers.
-  //    Copy src->dst in an unrolled loop.
-  //
-  // In both cases, fields are copied in pairs if possible, and left-overs are
-  // handled separately.
-  ASSERT(!AreAliased(dst, src));
-  ASSERT(!temps.IncludesAliasOf(dst));
-  ASSERT(!temps.IncludesAliasOf(src));
-  ASSERT(!temps.IncludesAliasOf(xzr));
-
-  if (emit_debug_code()) {
-    Cmp(dst, src);
-    Check(ne, kTheSourceAndDestinationAreTheSame);
-  }
-
-  // The value of 'count' at which a loop will be generated (if there are
-  // enough scratch registers).
-  static const unsigned kLoopThreshold = 8;
-
-  UseScratchRegisterScope masm_temps(this);
-  if ((temps.Count() >= 3) && (count >= kLoopThreshold)) {
-    CopyFieldsLoopPairsHelper(dst, src, count,
-                              Register(temps.PopLowestIndex()),
-                              Register(temps.PopLowestIndex()),
-                              Register(temps.PopLowestIndex()),
-                              masm_temps.AcquireX(),
-                              masm_temps.AcquireX());
-  } else if (temps.Count() >= 2) {
-    CopyFieldsUnrolledPairsHelper(dst, src, count,
-                                  Register(temps.PopLowestIndex()),
-                                  Register(temps.PopLowestIndex()),
-                                  masm_temps.AcquireX(),
-                                  masm_temps.AcquireX());
-  } else if (temps.Count() == 1) {
-    CopyFieldsUnrolledHelper(dst, src, count,
-                             Register(temps.PopLowestIndex()),
-                             masm_temps.AcquireX(),
-                             masm_temps.AcquireX());
-  } else {
-    UNREACHABLE();
-  }
-}
-
-
-void MacroAssembler::CopyBytes(Register dst,
-                               Register src,
-                               Register length,
-                               Register scratch,
-                               CopyHint hint) {
-  UseScratchRegisterScope temps(this);
-  Register tmp1 = temps.AcquireX();
-  Register tmp2 = temps.AcquireX();
-  ASSERT(!AreAliased(src, dst, length, scratch, tmp1, tmp2));
-  ASSERT(!AreAliased(src, dst, csp));
-
-  if (emit_debug_code()) {
-    // Check copy length.
-    Cmp(length, 0);
-    Assert(ge, kUnexpectedNegativeValue);
-
-    // Check src and dst buffers don't overlap.
-    Add(scratch, src, length);  // Calculate end of src buffer.
-    Cmp(scratch, dst);
-    Add(scratch, dst, length);  // Calculate end of dst buffer.
-    Ccmp(scratch, src, ZFlag, gt);
-    Assert(le, kCopyBuffersOverlap);
-  }
-
-  Label short_copy, short_loop, bulk_loop, done;
-
-  if ((hint == kCopyLong || hint == kCopyUnknown) && !FLAG_optimize_for_size) {
-    Register bulk_length = scratch;
-    int pair_size = 2 * kXRegSize;
-    int pair_mask = pair_size - 1;
-
-    Bic(bulk_length, length, pair_mask);
-    Cbz(bulk_length, &short_copy);
-    Bind(&bulk_loop);
-    Sub(bulk_length, bulk_length, pair_size);
-    Ldp(tmp1, tmp2, MemOperand(src, pair_size, PostIndex));
-    Stp(tmp1, tmp2, MemOperand(dst, pair_size, PostIndex));
-    Cbnz(bulk_length, &bulk_loop);
-
-    And(length, length, pair_mask);
-  }
-
-  Bind(&short_copy);
-  Cbz(length, &done);
-  Bind(&short_loop);
-  Sub(length, length, 1);
-  Ldrb(tmp1, MemOperand(src, 1, PostIndex));
-  Strb(tmp1, MemOperand(dst, 1, PostIndex));
-  Cbnz(length, &short_loop);
-
-
-  Bind(&done);
-}
-
-
-void MacroAssembler::FillFields(Register dst,
-                                Register field_count,
-                                Register filler) {
-  ASSERT(!dst.Is(csp));
-  UseScratchRegisterScope temps(this);
-  Register field_ptr = temps.AcquireX();
-  Register counter = temps.AcquireX();
-  Label done;
-
-  // Decrement count. If the result < zero, count was zero, and there's nothing
-  // to do. If count was one, flags are set to fail the gt condition at the end
-  // of the pairs loop.
-  Subs(counter, field_count, 1);
-  B(lt, &done);
-
-  // There's at least one field to fill, so do this unconditionally.
-  Str(filler, MemOperand(dst, kPointerSize, PostIndex));
-
-  // If the bottom bit of counter is set, there are an even number of fields to
-  // fill, so pull the start pointer back by one field, allowing the pairs loop
-  // to overwrite the field that was stored above.
-  And(field_ptr, counter, 1);
-  Sub(field_ptr, dst, Operand(field_ptr, LSL, kPointerSizeLog2));
-
-  // Store filler to memory in pairs.
-  Label entry, loop;
-  B(&entry);
-  Bind(&loop);
-  Stp(filler, filler, MemOperand(field_ptr, 2 * kPointerSize, PostIndex));
-  Subs(counter, counter, 2);
-  Bind(&entry);
-  B(gt, &loop);
-
-  Bind(&done);
-}
-
-
-void MacroAssembler::JumpIfEitherIsNotSequentialAsciiStrings(
-    Register first,
-    Register second,
-    Register scratch1,
-    Register scratch2,
-    Label* failure,
-    SmiCheckType smi_check) {
-
-  if (smi_check == DO_SMI_CHECK) {
-    JumpIfEitherSmi(first, second, failure);
-  } else if (emit_debug_code()) {
-    ASSERT(smi_check == DONT_DO_SMI_CHECK);
-    Label not_smi;
-    JumpIfEitherSmi(first, second, NULL, &not_smi);
-
-    // At least one input is a smi, but the flags indicated a smi check wasn't
-    // needed.
-    Abort(kUnexpectedSmi);
-
-    Bind(&not_smi);
-  }
-
-  // Test that both first and second are sequential ASCII strings.
-  Ldr(scratch1, FieldMemOperand(first, HeapObject::kMapOffset));
-  Ldr(scratch2, FieldMemOperand(second, HeapObject::kMapOffset));
-  Ldrb(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset));
-  Ldrb(scratch2, FieldMemOperand(scratch2, Map::kInstanceTypeOffset));
-
-  JumpIfEitherInstanceTypeIsNotSequentialAscii(scratch1,
-                                               scratch2,
-                                               scratch1,
-                                               scratch2,
-                                               failure);
-}
-
-
-void MacroAssembler::JumpIfEitherInstanceTypeIsNotSequentialAscii(
-    Register first,
-    Register second,
-    Register scratch1,
-    Register scratch2,
-    Label* failure) {
-  ASSERT(!AreAliased(scratch1, second));
-  ASSERT(!AreAliased(scratch1, scratch2));
-  static const int kFlatAsciiStringMask =
-      kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
-  static const int kFlatAsciiStringTag = ASCII_STRING_TYPE;
-  And(scratch1, first, kFlatAsciiStringMask);
-  And(scratch2, second, kFlatAsciiStringMask);
-  Cmp(scratch1, kFlatAsciiStringTag);
-  Ccmp(scratch2, kFlatAsciiStringTag, NoFlag, eq);
-  B(ne, failure);
-}
-
-
-void MacroAssembler::JumpIfInstanceTypeIsNotSequentialAscii(Register type,
-                                                            Register scratch,
-                                                            Label* failure) {
-  const int kFlatAsciiStringMask =
-      kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
-  const int kFlatAsciiStringTag =
-      kStringTag | kOneByteStringTag | kSeqStringTag;
-  And(scratch, type, kFlatAsciiStringMask);
-  Cmp(scratch, kFlatAsciiStringTag);
-  B(ne, failure);
-}
-
-
-void MacroAssembler::JumpIfBothInstanceTypesAreNotSequentialAscii(
-    Register first,
-    Register second,
-    Register scratch1,
-    Register scratch2,
-    Label* failure) {
-  ASSERT(!AreAliased(first, second, scratch1, scratch2));
-  const int kFlatAsciiStringMask =
-      kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
-  const int kFlatAsciiStringTag =
-      kStringTag | kOneByteStringTag | kSeqStringTag;
-  And(scratch1, first, kFlatAsciiStringMask);
-  And(scratch2, second, kFlatAsciiStringMask);
-  Cmp(scratch1, kFlatAsciiStringTag);
-  Ccmp(scratch2, kFlatAsciiStringTag, NoFlag, eq);
-  B(ne, failure);
-}
-
-
-void MacroAssembler::JumpIfNotUniqueName(Register type,
-                                         Label* not_unique_name) {
-  STATIC_ASSERT((kInternalizedTag == 0) && (kStringTag == 0));
-  // if ((type is string && type is internalized) || type == SYMBOL_TYPE) {
-  //   continue
-  // } else {
-  //   goto not_unique_name
-  // }
-  Tst(type, kIsNotStringMask | kIsNotInternalizedMask);
-  Ccmp(type, SYMBOL_TYPE, ZFlag, ne);
-  B(ne, not_unique_name);
-}
-
-
-void MacroAssembler::InvokePrologue(const ParameterCount& expected,
-                                    const ParameterCount& actual,
-                                    Handle<Code> code_constant,
-                                    Register code_reg,
-                                    Label* done,
-                                    InvokeFlag flag,
-                                    bool* definitely_mismatches,
-                                    const CallWrapper& call_wrapper) {
-  bool definitely_matches = false;
-  *definitely_mismatches = false;
-  Label regular_invoke;
-
-  // Check whether the expected and actual arguments count match. If not,
-  // setup registers according to contract with ArgumentsAdaptorTrampoline:
-  //  x0: actual arguments count.
-  //  x1: function (passed through to callee).
-  //  x2: expected arguments count.
-
-  // The code below is made a lot easier because the calling code already sets
-  // up actual and expected registers according to the contract if values are
-  // passed in registers.
-  ASSERT(actual.is_immediate() || actual.reg().is(x0));
-  ASSERT(expected.is_immediate() || expected.reg().is(x2));
-  ASSERT((!code_constant.is_null() && code_reg.is(no_reg)) || code_reg.is(x3));
-
-  if (expected.is_immediate()) {
-    ASSERT(actual.is_immediate());
-    if (expected.immediate() == actual.immediate()) {
-      definitely_matches = true;
-
-    } else {
-      Mov(x0, actual.immediate());
-      if (expected.immediate() ==
-          SharedFunctionInfo::kDontAdaptArgumentsSentinel) {
-        // Don't worry about adapting arguments for builtins that
-        // don't want that done. Skip adaption code by making it look
-        // like we have a match between expected and actual number of
-        // arguments.
-        definitely_matches = true;
-      } else {
-        *definitely_mismatches = true;
-        // Set up x2 for the argument adaptor.
-        Mov(x2, expected.immediate());
-      }
-    }
-
-  } else {  // expected is a register.
-    Operand actual_op = actual.is_immediate() ? Operand(actual.immediate())
-                                              : Operand(actual.reg());
-    // If actual == expected perform a regular invocation.
-    Cmp(expected.reg(), actual_op);
-    B(eq, &regular_invoke);
-    // Otherwise set up x0 for the argument adaptor.
-    Mov(x0, actual_op);
-  }
-
-  // If the argument counts may mismatch, generate a call to the argument
-  // adaptor.
-  if (!definitely_matches) {
-    if (!code_constant.is_null()) {
-      Mov(x3, Operand(code_constant));
-      Add(x3, x3, Code::kHeaderSize - kHeapObjectTag);
-    }
-
-    Handle<Code> adaptor =
-        isolate()->builtins()->ArgumentsAdaptorTrampoline();
-    if (flag == CALL_FUNCTION) {
-      call_wrapper.BeforeCall(CallSize(adaptor));
-      Call(adaptor);
-      call_wrapper.AfterCall();
-      if (!*definitely_mismatches) {
-        // If the arg counts don't match, no extra code is emitted by
-        // MAsm::InvokeCode and we can just fall through.
-        B(done);
-      }
-    } else {
-      Jump(adaptor, RelocInfo::CODE_TARGET);
-    }
-  }
-  Bind(&regular_invoke);
-}
-
-
-void MacroAssembler::InvokeCode(Register code,
-                                const ParameterCount& expected,
-                                const ParameterCount& actual,
-                                InvokeFlag flag,
-                                const CallWrapper& call_wrapper) {
-  // You can't call a function without a valid frame.
-  ASSERT(flag == JUMP_FUNCTION || has_frame());
-
-  Label done;
-
-  bool definitely_mismatches = false;
-  InvokePrologue(expected, actual, Handle<Code>::null(), code, &done, flag,
-                 &definitely_mismatches, call_wrapper);
-
-  // If we are certain that actual != expected, then we know InvokePrologue will
-  // have handled the call through the argument adaptor mechanism.
-  // The called function expects the call kind in x5.
-  if (!definitely_mismatches) {
-    if (flag == CALL_FUNCTION) {
-      call_wrapper.BeforeCall(CallSize(code));
-      Call(code);
-      call_wrapper.AfterCall();
-    } else {
-      ASSERT(flag == JUMP_FUNCTION);
-      Jump(code);
-    }
-  }
-
-  // Continue here if InvokePrologue does handle the invocation due to
-  // mismatched parameter counts.
-  Bind(&done);
-}
-
-
-void MacroAssembler::InvokeFunction(Register function,
-                                    const ParameterCount& actual,
-                                    InvokeFlag flag,
-                                    const CallWrapper& call_wrapper) {
-  // You can't call a function without a valid frame.
-  ASSERT(flag == JUMP_FUNCTION || has_frame());
-
-  // Contract with called JS functions requires that function is passed in x1.
-  // (See FullCodeGenerator::Generate().)
-  ASSERT(function.is(x1));
-
-  Register expected_reg = x2;
-  Register code_reg = x3;
-
-  Ldr(cp, FieldMemOperand(function, JSFunction::kContextOffset));
-  // The number of arguments is stored as an int32_t, and -1 is a marker
-  // (SharedFunctionInfo::kDontAdaptArgumentsSentinel), so we need sign
-  // extension to correctly handle it.
-  Ldr(expected_reg, FieldMemOperand(function,
-                                    JSFunction::kSharedFunctionInfoOffset));
-  Ldrsw(expected_reg,
-        FieldMemOperand(expected_reg,
-                        SharedFunctionInfo::kFormalParameterCountOffset));
-  Ldr(code_reg,
-      FieldMemOperand(function, JSFunction::kCodeEntryOffset));
-
-  ParameterCount expected(expected_reg);
-  InvokeCode(code_reg, expected, actual, flag, call_wrapper);
-}
-
-
-void MacroAssembler::InvokeFunction(Register function,
-                                    const ParameterCount& expected,
-                                    const ParameterCount& actual,
-                                    InvokeFlag flag,
-                                    const CallWrapper& call_wrapper) {
-  // You can't call a function without a valid frame.
-  ASSERT(flag == JUMP_FUNCTION || has_frame());
-
-  // Contract with called JS functions requires that function is passed in x1.
-  // (See FullCodeGenerator::Generate().)
-  ASSERT(function.Is(x1));
-
-  Register code_reg = x3;
-
-  // Set up the context.
-  Ldr(cp, FieldMemOperand(function, JSFunction::kContextOffset));
-
-  // We call indirectly through the code field in the function to
-  // allow recompilation to take effect without changing any of the
-  // call sites.
-  Ldr(code_reg, FieldMemOperand(function, JSFunction::kCodeEntryOffset));
-  InvokeCode(code_reg, expected, actual, flag, call_wrapper);
-}
-
-
-void MacroAssembler::InvokeFunction(Handle<JSFunction> function,
-                                    const ParameterCount& expected,
-                                    const ParameterCount& actual,
-                                    InvokeFlag flag,
-                                    const CallWrapper& call_wrapper) {
-  // Contract with called JS functions requires that function is passed in x1.
-  // (See FullCodeGenerator::Generate().)
-  __ LoadObject(x1, function);
-  InvokeFunction(x1, expected, actual, flag, call_wrapper);
-}
-
-
-void MacroAssembler::TryConvertDoubleToInt64(Register result,
-                                             DoubleRegister double_input,
-                                             Label* done) {
-  // Try to convert with an FPU convert instruction. It's trivial to compute
-  // the modulo operation on an integer register so we convert to a 64-bit
-  // integer.
-  //
-  // Fcvtzs will saturate to INT64_MIN (0x800...00) or INT64_MAX (0x7ff...ff)
-  // when the double is out of range. NaNs and infinities will be converted to 0
-  // (as ECMA-262 requires).
-  Fcvtzs(result.X(), double_input);
-
-  // The values INT64_MIN (0x800...00) or INT64_MAX (0x7ff...ff) are not
-  // representable using a double, so if the result is one of those then we know
-  // that saturation occured, and we need to manually handle the conversion.
-  //
-  // It is easy to detect INT64_MIN and INT64_MAX because adding or subtracting
-  // 1 will cause signed overflow.
-  Cmp(result.X(), 1);
-  Ccmp(result.X(), -1, VFlag, vc);
-
-  B(vc, done);
-}
-
-
-void MacroAssembler::TruncateDoubleToI(Register result,
-                                       DoubleRegister double_input) {
-  Label done;
-  ASSERT(jssp.Is(StackPointer()));
-
-  // Try to convert the double to an int64. If successful, the bottom 32 bits
-  // contain our truncated int32 result.
-  TryConvertDoubleToInt64(result, double_input, &done);
-
-  // If we fell through then inline version didn't succeed - call stub instead.
-  Push(lr);
-  Push(double_input);  // Put input on stack.
-
-  DoubleToIStub stub(jssp,
-                     result,
-                     0,
-                     true,   // is_truncating
-                     true);  // skip_fastpath
-  CallStub(&stub);  // DoubleToIStub preserves any registers it needs to clobber
-
-  Drop(1, kDoubleSize);  // Drop the double input on the stack.
-  Pop(lr);
-
-  Bind(&done);
-}
-
-
-void MacroAssembler::TruncateHeapNumberToI(Register result,
-                                           Register object) {
-  Label done;
-  ASSERT(!result.is(object));
-  ASSERT(jssp.Is(StackPointer()));
-
-  Ldr(fp_scratch, FieldMemOperand(object, HeapNumber::kValueOffset));
-
-  // Try to convert the double to an int64. If successful, the bottom 32 bits
-  // contain our truncated int32 result.
-  TryConvertDoubleToInt64(result, fp_scratch, &done);
-
-  // If we fell through then inline version didn't succeed - call stub instead.
-  Push(lr);
-  DoubleToIStub stub(object,
-                     result,
-                     HeapNumber::kValueOffset - kHeapObjectTag,
-                     true,   // is_truncating
-                     true);  // skip_fastpath
-  CallStub(&stub);  // DoubleToIStub preserves any registers it needs to clobber
-  Pop(lr);
-
-  Bind(&done);
-}
-
-
-void MacroAssembler::Prologue(PrologueFrameMode frame_mode) {
-  if (frame_mode == BUILD_STUB_FRAME) {
-    ASSERT(StackPointer().Is(jssp));
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireX();
-    __ Mov(temp, Smi::FromInt(StackFrame::STUB));
-    // Compiled stubs don't age, and so they don't need the predictable code
-    // ageing sequence.
-    __ Push(lr, fp, cp, temp);
-    __ Add(fp, jssp, StandardFrameConstants::kFixedFrameSizeFromFp);
-  } else {
-    if (isolate()->IsCodePreAgingActive()) {
-      Code* stub = Code::GetPreAgedCodeAgeStub(isolate());
-      __ EmitCodeAgeSequence(stub);
-    } else {
-      __ EmitFrameSetupForCodeAgePatching();
-    }
-  }
-}
-
-
-void MacroAssembler::EnterFrame(StackFrame::Type type) {
-  ASSERT(jssp.Is(StackPointer()));
-  UseScratchRegisterScope temps(this);
-  Register type_reg = temps.AcquireX();
-  Register code_reg = temps.AcquireX();
-
-  Push(lr, fp, cp);
-  Mov(type_reg, Smi::FromInt(type));
-  Mov(code_reg, Operand(CodeObject()));
-  Push(type_reg, code_reg);
-  // jssp[4] : lr
-  // jssp[3] : fp
-  // jssp[2] : cp
-  // jssp[1] : type
-  // jssp[0] : code object
-
-  // Adjust FP to point to saved FP.
-  Add(fp, jssp, StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize);
-}
-
-
-void MacroAssembler::LeaveFrame(StackFrame::Type type) {
-  ASSERT(jssp.Is(StackPointer()));
-  // Drop the execution stack down to the frame pointer and restore
-  // the caller frame pointer and return address.
-  Mov(jssp, fp);
-  AssertStackConsistency();
-  Pop(fp, lr);
-}
-
-
-void MacroAssembler::ExitFramePreserveFPRegs() {
-  PushCPURegList(kCallerSavedFP);
-}
-
-
-void MacroAssembler::ExitFrameRestoreFPRegs() {
-  // Read the registers from the stack without popping them. The stack pointer
-  // will be reset as part of the unwinding process.
-  CPURegList saved_fp_regs = kCallerSavedFP;
-  ASSERT(saved_fp_regs.Count() % 2 == 0);
-
-  int offset = ExitFrameConstants::kLastExitFrameField;
-  while (!saved_fp_regs.IsEmpty()) {
-    const CPURegister& dst0 = saved_fp_regs.PopHighestIndex();
-    const CPURegister& dst1 = saved_fp_regs.PopHighestIndex();
-    offset -= 2 * kDRegSize;
-    Ldp(dst1, dst0, MemOperand(fp, offset));
-  }
-}
-
-
-void MacroAssembler::EnterExitFrame(bool save_doubles,
-                                    const Register& scratch,
-                                    int extra_space) {
-  ASSERT(jssp.Is(StackPointer()));
-
-  // Set up the new stack frame.
-  Mov(scratch, Operand(CodeObject()));
-  Push(lr, fp);
-  Mov(fp, StackPointer());
-  Push(xzr, scratch);
-  //          fp[8]: CallerPC (lr)
-  //    fp -> fp[0]: CallerFP (old fp)
-  //          fp[-8]: Space reserved for SPOffset.
-  //  jssp -> fp[-16]: CodeObject()
-  STATIC_ASSERT((2 * kPointerSize) ==
-                ExitFrameConstants::kCallerSPDisplacement);
-  STATIC_ASSERT((1 * kPointerSize) == ExitFrameConstants::kCallerPCOffset);
-  STATIC_ASSERT((0 * kPointerSize) == ExitFrameConstants::kCallerFPOffset);
-  STATIC_ASSERT((-1 * kPointerSize) == ExitFrameConstants::kSPOffset);
-  STATIC_ASSERT((-2 * kPointerSize) == ExitFrameConstants::kCodeOffset);
-
-  // Save the frame pointer and context pointer in the top frame.
-  Mov(scratch, Operand(ExternalReference(Isolate::kCEntryFPAddress,
-                                         isolate())));
-  Str(fp, MemOperand(scratch));
-  Mov(scratch, Operand(ExternalReference(Isolate::kContextAddress,
-                                         isolate())));
-  Str(cp, MemOperand(scratch));
-
-  STATIC_ASSERT((-2 * kPointerSize) ==
-                ExitFrameConstants::kLastExitFrameField);
-  if (save_doubles) {
-    ExitFramePreserveFPRegs();
-  }
-
-  // Reserve space for the return address and for user requested memory.
-  // We do this before aligning to make sure that we end up correctly
-  // aligned with the minimum of wasted space.
-  Claim(extra_space + 1, kXRegSize);
-  //         fp[8]: CallerPC (lr)
-  //   fp -> fp[0]: CallerFP (old fp)
-  //         fp[-8]: Space reserved for SPOffset.
-  //         fp[-16]: CodeObject()
-  //         fp[-16 - fp_size]: Saved doubles (if save_doubles is true).
-  //         jssp[8]: Extra space reserved for caller (if extra_space != 0).
-  // jssp -> jssp[0]: Space reserved for the return address.
-
-  // Align and synchronize the system stack pointer with jssp.
-  AlignAndSetCSPForFrame();
-  ASSERT(csp.Is(StackPointer()));
-
-  //         fp[8]: CallerPC (lr)
-  //   fp -> fp[0]: CallerFP (old fp)
-  //         fp[-8]: Space reserved for SPOffset.
-  //         fp[-16]: CodeObject()
-  //         fp[-16 - fp_size]: Saved doubles (if save_doubles is true).
-  //         csp[8]: Memory reserved for the caller if extra_space != 0.
-  //                 Alignment padding, if necessary.
-  //  csp -> csp[0]: Space reserved for the return address.
-
-  // ExitFrame::GetStateForFramePointer expects to find the return address at
-  // the memory address immediately below the pointer stored in SPOffset.
-  // It is not safe to derive much else from SPOffset, because the size of the
-  // padding can vary.
-  Add(scratch, csp, kXRegSize);
-  Str(scratch, MemOperand(fp, ExitFrameConstants::kSPOffset));
-}
-
-
-// Leave the current exit frame.
-void MacroAssembler::LeaveExitFrame(bool restore_doubles,
-                                    const Register& scratch,
-                                    bool restore_context) {
-  ASSERT(csp.Is(StackPointer()));
-
-  if (restore_doubles) {
-    ExitFrameRestoreFPRegs();
-  }
-
-  // Restore the context pointer from the top frame.
-  if (restore_context) {
-    Mov(scratch, Operand(ExternalReference(Isolate::kContextAddress,
-                                           isolate())));
-    Ldr(cp, MemOperand(scratch));
-  }
-
-  if (emit_debug_code()) {
-    // Also emit debug code to clear the cp in the top frame.
-    Mov(scratch, Operand(ExternalReference(Isolate::kContextAddress,
-                                           isolate())));
-    Str(xzr, MemOperand(scratch));
-  }
-  // Clear the frame pointer from the top frame.
-  Mov(scratch, Operand(ExternalReference(Isolate::kCEntryFPAddress,
-                                         isolate())));
-  Str(xzr, MemOperand(scratch));
-
-  // Pop the exit frame.
-  //         fp[8]: CallerPC (lr)
-  //   fp -> fp[0]: CallerFP (old fp)
-  //         fp[...]: The rest of the frame.
-  Mov(jssp, fp);
-  SetStackPointer(jssp);
-  AssertStackConsistency();
-  Pop(fp, lr);
-}
-
-
-void MacroAssembler::SetCounter(StatsCounter* counter, int value,
-                                Register scratch1, Register scratch2) {
-  if (FLAG_native_code_counters && counter->Enabled()) {
-    Mov(scratch1, value);
-    Mov(scratch2, ExternalReference(counter));
-    Str(scratch1, MemOperand(scratch2));
-  }
-}
-
-
-void MacroAssembler::IncrementCounter(StatsCounter* counter, int value,
-                                      Register scratch1, Register scratch2) {
-  ASSERT(value != 0);
-  if (FLAG_native_code_counters && counter->Enabled()) {
-    Mov(scratch2, ExternalReference(counter));
-    Ldr(scratch1, MemOperand(scratch2));
-    Add(scratch1, scratch1, value);
-    Str(scratch1, MemOperand(scratch2));
-  }
-}
-
-
-void MacroAssembler::DecrementCounter(StatsCounter* counter, int value,
-                                      Register scratch1, Register scratch2) {
-  IncrementCounter(counter, -value, scratch1, scratch2);
-}
-
-
-void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
-  if (context_chain_length > 0) {
-    // Move up the chain of contexts to the context containing the slot.
-    Ldr(dst, MemOperand(cp, Context::SlotOffset(Context::PREVIOUS_INDEX)));
-    for (int i = 1; i < context_chain_length; i++) {
-      Ldr(dst, MemOperand(dst, Context::SlotOffset(Context::PREVIOUS_INDEX)));
-    }
-  } else {
-    // Slot is in the current function context.  Move it into the
-    // destination register in case we store into it (the write barrier
-    // cannot be allowed to destroy the context in cp).
-    Mov(dst, cp);
-  }
-}
-
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
-void MacroAssembler::DebugBreak() {
-  Mov(x0, 0);
-  Mov(x1, ExternalReference(Runtime::kDebugBreak, isolate()));
-  CEntryStub ces(1);
-  ASSERT(AllowThisStubCall(&ces));
-  Call(ces.GetCode(isolate()), RelocInfo::DEBUG_BREAK);
-}
-#endif
-
-
-void MacroAssembler::PushTryHandler(StackHandler::Kind kind,
-                                    int handler_index) {
-  ASSERT(jssp.Is(StackPointer()));
-  // Adjust this code if the asserts don't hold.
-  STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
-
-  // For the JSEntry handler, we must preserve the live registers x0-x4.
-  // (See JSEntryStub::GenerateBody().)
-
-  unsigned state =
-      StackHandler::IndexField::encode(handler_index) |
-      StackHandler::KindField::encode(kind);
-
-  // Set up the code object and the state for pushing.
-  Mov(x10, Operand(CodeObject()));
-  Mov(x11, state);
-
-  // Push the frame pointer, context, state, and code object.
-  if (kind == StackHandler::JS_ENTRY) {
-    ASSERT(Smi::FromInt(0) == 0);
-    Push(xzr, xzr, x11, x10);
-  } else {
-    Push(fp, cp, x11, x10);
-  }
-
-  // Link the current handler as the next handler.
-  Mov(x11, ExternalReference(Isolate::kHandlerAddress, isolate()));
-  Ldr(x10, MemOperand(x11));
-  Push(x10);
-  // Set this new handler as the current one.
-  Str(jssp, MemOperand(x11));
-}
-
-
-void MacroAssembler::PopTryHandler() {
-  STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
-  Pop(x10);
-  Mov(x11, ExternalReference(Isolate::kHandlerAddress, isolate()));
-  Drop(StackHandlerConstants::kSize - kXRegSize, kByteSizeInBytes);
-  Str(x10, MemOperand(x11));
-}
-
-
-void MacroAssembler::Allocate(int object_size,
-                              Register result,
-                              Register scratch1,
-                              Register scratch2,
-                              Label* gc_required,
-                              AllocationFlags flags) {
-  ASSERT(object_size <= Page::kMaxRegularHeapObjectSize);
-  if (!FLAG_inline_new) {
-    if (emit_debug_code()) {
-      // Trash the registers to simulate an allocation failure.
-      // We apply salt to the original zap value to easily spot the values.
-      Mov(result, (kDebugZapValue & ~0xffL) | 0x11L);
-      Mov(scratch1, (kDebugZapValue & ~0xffL) | 0x21L);
-      Mov(scratch2, (kDebugZapValue & ~0xffL) | 0x21L);
-    }
-    B(gc_required);
-    return;
-  }
-
-  UseScratchRegisterScope temps(this);
-  Register scratch3 = temps.AcquireX();
-
-  ASSERT(!AreAliased(result, scratch1, scratch2, scratch3));
-  ASSERT(result.Is64Bits() && scratch1.Is64Bits() && scratch2.Is64Bits());
-
-  // Make object size into bytes.
-  if ((flags & SIZE_IN_WORDS) != 0) {
-    object_size *= kPointerSize;
-  }
-  ASSERT(0 == (object_size & kObjectAlignmentMask));
-
-  // Check relative positions of allocation top and limit addresses.
-  // The values must be adjacent in memory to allow the use of LDP.
-  ExternalReference heap_allocation_top =
-      AllocationUtils::GetAllocationTopReference(isolate(), flags);
-  ExternalReference heap_allocation_limit =
-      AllocationUtils::GetAllocationLimitReference(isolate(), flags);
-  intptr_t top = reinterpret_cast<intptr_t>(heap_allocation_top.address());
-  intptr_t limit = reinterpret_cast<intptr_t>(heap_allocation_limit.address());
-  ASSERT((limit - top) == kPointerSize);
-
-  // Set up allocation top address and object size registers.
-  Register top_address = scratch1;
-  Register allocation_limit = scratch2;
-  Mov(top_address, Operand(heap_allocation_top));
-
-  if ((flags & RESULT_CONTAINS_TOP) == 0) {
-    // Load allocation top into result and the allocation limit.
-    Ldp(result, allocation_limit, MemOperand(top_address));
-  } else {
-    if (emit_debug_code()) {
-      // Assert that result actually contains top on entry.
-      Ldr(scratch3, MemOperand(top_address));
-      Cmp(result, scratch3);
-      Check(eq, kUnexpectedAllocationTop);
-    }
-    // Load the allocation limit. 'result' already contains the allocation top.
-    Ldr(allocation_limit, MemOperand(top_address, limit - top));
-  }
-
-  // We can ignore DOUBLE_ALIGNMENT flags here because doubles and pointers have
-  // the same alignment on A64.
-  STATIC_ASSERT(kPointerAlignment == kDoubleAlignment);
-
-  // Calculate new top and bail out if new space is exhausted.
-  Adds(scratch3, result, object_size);
-  B(vs, gc_required);
-  Cmp(scratch3, allocation_limit);
-  B(hi, gc_required);
-  Str(scratch3, MemOperand(top_address));
-
-  // Tag the object if requested.
-  if ((flags & TAG_OBJECT) != 0) {
-    Orr(result, result, kHeapObjectTag);
-  }
-}
-
-
-void MacroAssembler::Allocate(Register object_size,
-                              Register result,
-                              Register scratch1,
-                              Register scratch2,
-                              Label* gc_required,
-                              AllocationFlags flags) {
-  if (!FLAG_inline_new) {
-    if (emit_debug_code()) {
-      // Trash the registers to simulate an allocation failure.
-      // We apply salt to the original zap value to easily spot the values.
-      Mov(result, (kDebugZapValue & ~0xffL) | 0x11L);
-      Mov(scratch1, (kDebugZapValue & ~0xffL) | 0x21L);
-      Mov(scratch2, (kDebugZapValue & ~0xffL) | 0x21L);
-    }
-    B(gc_required);
-    return;
-  }
-
-  UseScratchRegisterScope temps(this);
-  Register scratch3 = temps.AcquireX();
-
-  ASSERT(!AreAliased(object_size, result, scratch1, scratch2, scratch3));
-  ASSERT(object_size.Is64Bits() && result.Is64Bits() &&
-         scratch1.Is64Bits() && scratch2.Is64Bits());
-
-  // Check relative positions of allocation top and limit addresses.
-  // The values must be adjacent in memory to allow the use of LDP.
-  ExternalReference heap_allocation_top =
-      AllocationUtils::GetAllocationTopReference(isolate(), flags);
-  ExternalReference heap_allocation_limit =
-      AllocationUtils::GetAllocationLimitReference(isolate(), flags);
-  intptr_t top = reinterpret_cast<intptr_t>(heap_allocation_top.address());
-  intptr_t limit = reinterpret_cast<intptr_t>(heap_allocation_limit.address());
-  ASSERT((limit - top) == kPointerSize);
-
-  // Set up allocation top address and object size registers.
-  Register top_address = scratch1;
-  Register allocation_limit = scratch2;
-  Mov(top_address, heap_allocation_top);
-
-  if ((flags & RESULT_CONTAINS_TOP) == 0) {
-    // Load allocation top into result and the allocation limit.
-    Ldp(result, allocation_limit, MemOperand(top_address));
-  } else {
-    if (emit_debug_code()) {
-      // Assert that result actually contains top on entry.
-      Ldr(scratch3, MemOperand(top_address));
-      Cmp(result, scratch3);
-      Check(eq, kUnexpectedAllocationTop);
-    }
-    // Load the allocation limit. 'result' already contains the allocation top.
-    Ldr(allocation_limit, MemOperand(top_address, limit - top));
-  }
-
-  // We can ignore DOUBLE_ALIGNMENT flags here because doubles and pointers have
-  // the same alignment on A64.
-  STATIC_ASSERT(kPointerAlignment == kDoubleAlignment);
-
-  // Calculate new top and bail out if new space is exhausted
-  if ((flags & SIZE_IN_WORDS) != 0) {
-    Adds(scratch3, result, Operand(object_size, LSL, kPointerSizeLog2));
-  } else {
-    Adds(scratch3, result, object_size);
-  }
-
-  if (emit_debug_code()) {
-    Tst(scratch3, kObjectAlignmentMask);
-    Check(eq, kUnalignedAllocationInNewSpace);
-  }
-
-  B(vs, gc_required);
-  Cmp(scratch3, allocation_limit);
-  B(hi, gc_required);
-  Str(scratch3, MemOperand(top_address));
-
-  // Tag the object if requested.
-  if ((flags & TAG_OBJECT) != 0) {
-    Orr(result, result, kHeapObjectTag);
-  }
-}
-
-
-void MacroAssembler::UndoAllocationInNewSpace(Register object,
-                                              Register scratch) {
-  ExternalReference new_space_allocation_top =
-      ExternalReference::new_space_allocation_top_address(isolate());
-
-  // Make sure the object has no tag before resetting top.
-  Bic(object, object, kHeapObjectTagMask);
-#ifdef DEBUG
-  // Check that the object un-allocated is below the current top.
-  Mov(scratch, new_space_allocation_top);
-  Ldr(scratch, MemOperand(scratch));
-  Cmp(object, scratch);
-  Check(lt, kUndoAllocationOfNonAllocatedMemory);
-#endif
-  // Write the address of the object to un-allocate as the current top.
-  Mov(scratch, new_space_allocation_top);
-  Str(object, MemOperand(scratch));
-}
-
-
-void MacroAssembler::AllocateTwoByteString(Register result,
-                                           Register length,
-                                           Register scratch1,
-                                           Register scratch2,
-                                           Register scratch3,
-                                           Label* gc_required) {
-  ASSERT(!AreAliased(result, length, scratch1, scratch2, scratch3));
-  // Calculate the number of bytes needed for the characters in the string while
-  // observing object alignment.
-  STATIC_ASSERT((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0);
-  Add(scratch1, length, length);  // Length in bytes, not chars.
-  Add(scratch1, scratch1, kObjectAlignmentMask + SeqTwoByteString::kHeaderSize);
-  Bic(scratch1, scratch1, kObjectAlignmentMask);
-
-  // Allocate two-byte string in new space.
-  Allocate(scratch1,
-           result,
-           scratch2,
-           scratch3,
-           gc_required,
-           TAG_OBJECT);
-
-  // Set the map, length and hash field.
-  InitializeNewString(result,
-                      length,
-                      Heap::kStringMapRootIndex,
-                      scratch1,
-                      scratch2);
-}
-
-
-void MacroAssembler::AllocateAsciiString(Register result,
-                                         Register length,
-                                         Register scratch1,
-                                         Register scratch2,
-                                         Register scratch3,
-                                         Label* gc_required) {
-  ASSERT(!AreAliased(result, length, scratch1, scratch2, scratch3));
-  // Calculate the number of bytes needed for the characters in the string while
-  // observing object alignment.
-  STATIC_ASSERT((SeqOneByteString::kHeaderSize & kObjectAlignmentMask) == 0);
-  STATIC_ASSERT(kCharSize == 1);
-  Add(scratch1, length, kObjectAlignmentMask + SeqOneByteString::kHeaderSize);
-  Bic(scratch1, scratch1, kObjectAlignmentMask);
-
-  // Allocate ASCII string in new space.
-  Allocate(scratch1,
-           result,
-           scratch2,
-           scratch3,
-           gc_required,
-           TAG_OBJECT);
-
-  // Set the map, length and hash field.
-  InitializeNewString(result,
-                      length,
-                      Heap::kAsciiStringMapRootIndex,
-                      scratch1,
-                      scratch2);
-}
-
-
-void MacroAssembler::AllocateTwoByteConsString(Register result,
-                                               Register length,
-                                               Register scratch1,
-                                               Register scratch2,
-                                               Label* gc_required) {
-  Allocate(ConsString::kSize, result, scratch1, scratch2, gc_required,
-           TAG_OBJECT);
-
-  InitializeNewString(result,
-                      length,
-                      Heap::kConsStringMapRootIndex,
-                      scratch1,
-                      scratch2);
-}
-
-
-void MacroAssembler::AllocateAsciiConsString(Register result,
-                                             Register length,
-                                             Register scratch1,
-                                             Register scratch2,
-                                             Label* gc_required) {
-  Label allocate_new_space, install_map;
-  AllocationFlags flags = TAG_OBJECT;
-
-  ExternalReference high_promotion_mode = ExternalReference::
-      new_space_high_promotion_mode_active_address(isolate());
-  Mov(scratch1, high_promotion_mode);
-  Ldr(scratch1, MemOperand(scratch1));
-  Cbz(scratch1, &allocate_new_space);
-
-  Allocate(ConsString::kSize,
-           result,
-           scratch1,
-           scratch2,
-           gc_required,
-           static_cast<AllocationFlags>(flags | PRETENURE_OLD_POINTER_SPACE));
-
-  B(&install_map);
-
-  Bind(&allocate_new_space);
-  Allocate(ConsString::kSize,
-           result,
-           scratch1,
-           scratch2,
-           gc_required,
-           flags);
-
-  Bind(&install_map);
-
-  InitializeNewString(result,
-                      length,
-                      Heap::kConsAsciiStringMapRootIndex,
-                      scratch1,
-                      scratch2);
-}
-
-
-void MacroAssembler::AllocateTwoByteSlicedString(Register result,
-                                                 Register length,
-                                                 Register scratch1,
-                                                 Register scratch2,
-                                                 Label* gc_required) {
-  ASSERT(!AreAliased(result, length, scratch1, scratch2));
-  Allocate(SlicedString::kSize, result, scratch1, scratch2, gc_required,
-           TAG_OBJECT);
-
-  InitializeNewString(result,
-                      length,
-                      Heap::kSlicedStringMapRootIndex,
-                      scratch1,
-                      scratch2);
-}
-
-
-void MacroAssembler::AllocateAsciiSlicedString(Register result,
-                                               Register length,
-                                               Register scratch1,
-                                               Register scratch2,
-                                               Label* gc_required) {
-  ASSERT(!AreAliased(result, length, scratch1, scratch2));
-  Allocate(SlicedString::kSize, result, scratch1, scratch2, gc_required,
-           TAG_OBJECT);
-
-  InitializeNewString(result,
-                      length,
-                      Heap::kSlicedAsciiStringMapRootIndex,
-                      scratch1,
-                      scratch2);
-}
-
-
-// Allocates a heap number or jumps to the need_gc label if the young space
-// is full and a scavenge is needed.
-void MacroAssembler::AllocateHeapNumber(Register result,
-                                        Label* gc_required,
-                                        Register scratch1,
-                                        Register scratch2,
-                                        Register heap_number_map) {
-  // Allocate an object in the heap for the heap number and tag it as a heap
-  // object.
-  Allocate(HeapNumber::kSize, result, scratch1, scratch2, gc_required,
-           TAG_OBJECT);
-
-  // Store heap number map in the allocated object.
-  if (heap_number_map.Is(NoReg)) {
-    heap_number_map = scratch1;
-    LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
-  }
-  AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
-  Str(heap_number_map, FieldMemOperand(result, HeapObject::kMapOffset));
-}
-
-
-void MacroAssembler::AllocateHeapNumberWithValue(Register result,
-                                                 DoubleRegister value,
-                                                 Label* gc_required,
-                                                 Register scratch1,
-                                                 Register scratch2,
-                                                 Register heap_number_map) {
-  // TODO(all): Check if it would be more efficient to use STP to store both
-  // the map and the value.
-  AllocateHeapNumber(result, gc_required, scratch1, scratch2, heap_number_map);
-  Str(value, FieldMemOperand(result, HeapNumber::kValueOffset));
-}
-
-
-void MacroAssembler::JumpIfObjectType(Register object,
-                                      Register map,
-                                      Register type_reg,
-                                      InstanceType type,
-                                      Label* if_cond_pass,
-                                      Condition cond) {
-  CompareObjectType(object, map, type_reg, type);
-  B(cond, if_cond_pass);
-}
-
-
-void MacroAssembler::JumpIfNotObjectType(Register object,
-                                         Register map,
-                                         Register type_reg,
-                                         InstanceType type,
-                                         Label* if_not_object) {
-  JumpIfObjectType(object, map, type_reg, type, if_not_object, ne);
-}
-
-
-// Sets condition flags based on comparison, and returns type in type_reg.
-void MacroAssembler::CompareObjectType(Register object,
-                                       Register map,
-                                       Register type_reg,
-                                       InstanceType type) {
-  Ldr(map, FieldMemOperand(object, HeapObject::kMapOffset));
-  CompareInstanceType(map, type_reg, type);
-}
-
-
-// Sets condition flags based on comparison, and returns type in type_reg.
-void MacroAssembler::CompareInstanceType(Register map,
-                                         Register type_reg,
-                                         InstanceType type) {
-  Ldrb(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
-  Cmp(type_reg, type);
-}
-
-
-void MacroAssembler::CompareMap(Register obj,
-                                Register scratch,
-                                Handle<Map> map) {
-  Ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
-  CompareMap(scratch, map);
-}
-
-
-void MacroAssembler::CompareMap(Register obj_map,
-                                Handle<Map> map) {
-  Cmp(obj_map, Operand(map));
-}
-
-
-void MacroAssembler::CheckMap(Register obj,
-                              Register scratch,
-                              Handle<Map> map,
-                              Label* fail,
-                              SmiCheckType smi_check_type) {
-  if (smi_check_type == DO_SMI_CHECK) {
-    JumpIfSmi(obj, fail);
-  }
-
-  CompareMap(obj, scratch, map);
-  B(ne, fail);
-}
-
-
-void MacroAssembler::CheckMap(Register obj,
-                              Register scratch,
-                              Heap::RootListIndex index,
-                              Label* fail,
-                              SmiCheckType smi_check_type) {
-  if (smi_check_type == DO_SMI_CHECK) {
-    JumpIfSmi(obj, fail);
-  }
-  Ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
-  JumpIfNotRoot(scratch, index, fail);
-}
-
-
-void MacroAssembler::CheckMap(Register obj_map,
-                              Handle<Map> map,
-                              Label* fail,
-                              SmiCheckType smi_check_type) {
-  if (smi_check_type == DO_SMI_CHECK) {
-    JumpIfSmi(obj_map, fail);
-  }
-
-  CompareMap(obj_map, map);
-  B(ne, fail);
-}
-
-
-void MacroAssembler::DispatchMap(Register obj,
-                                 Register scratch,
-                                 Handle<Map> map,
-                                 Handle<Code> success,
-                                 SmiCheckType smi_check_type) {
-  Label fail;
-  if (smi_check_type == DO_SMI_CHECK) {
-    JumpIfSmi(obj, &fail);
-  }
-  Ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
-  Cmp(scratch, Operand(map));
-  B(ne, &fail);
-  Jump(success, RelocInfo::CODE_TARGET);
-  Bind(&fail);
-}
-
-
-void MacroAssembler::TestMapBitfield(Register object, uint64_t mask) {
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireX();
-  Ldr(temp, FieldMemOperand(object, HeapObject::kMapOffset));
-  Ldrb(temp, FieldMemOperand(temp, Map::kBitFieldOffset));
-  Tst(temp, mask);
-}
-
-
-void MacroAssembler::LoadElementsKindFromMap(Register result, Register map) {
-  // Load the map's "bit field 2".
-  __ Ldrb(result, FieldMemOperand(map, Map::kBitField2Offset));
-  // Retrieve elements_kind from bit field 2.
-  __ Ubfx(result, result, Map::kElementsKindShift, Map::kElementsKindBitCount);
-}
-
-
-void MacroAssembler::TryGetFunctionPrototype(Register function,
-                                             Register result,
-                                             Register scratch,
-                                             Label* miss,
-                                             BoundFunctionAction action) {
-  ASSERT(!AreAliased(function, result, scratch));
-
-  // Check that the receiver isn't a smi.
-  JumpIfSmi(function, miss);
-
-  // Check that the function really is a function. Load map into result reg.
-  JumpIfNotObjectType(function, result, scratch, JS_FUNCTION_TYPE, miss);
-
-  if (action == kMissOnBoundFunction) {
-    Register scratch_w = scratch.W();
-    Ldr(scratch,
-        FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
-    // On 64-bit platforms, compiler hints field is not a smi. See definition of
-    // kCompilerHintsOffset in src/objects.h.
-    Ldr(scratch_w,
-        FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset));
-    Tbnz(scratch, SharedFunctionInfo::kBoundFunction, miss);
-  }
-
-  // Make sure that the function has an instance prototype.
-  Label non_instance;
-  Ldrb(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
-  Tbnz(scratch, Map::kHasNonInstancePrototype, &non_instance);
-
-  // Get the prototype or initial map from the function.
-  Ldr(result,
-      FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
-
-  // If the prototype or initial map is the hole, don't return it and simply
-  // miss the cache instead. This will allow us to allocate a prototype object
-  // on-demand in the runtime system.
-  JumpIfRoot(result, Heap::kTheHoleValueRootIndex, miss);
-
-  // If the function does not have an initial map, we're done.
-  Label done;
-  JumpIfNotObjectType(result, scratch, scratch, MAP_TYPE, &done);
-
-  // Get the prototype from the initial map.
-  Ldr(result, FieldMemOperand(result, Map::kPrototypeOffset));
-  B(&done);
-
-  // Non-instance prototype: fetch prototype from constructor field in initial
-  // map.
-  Bind(&non_instance);
-  Ldr(result, FieldMemOperand(result, Map::kConstructorOffset));
-
-  // All done.
-  Bind(&done);
-}
-
-
-void MacroAssembler::CompareRoot(const Register& obj,
-                                 Heap::RootListIndex index) {
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireX();
-  ASSERT(!AreAliased(obj, temp));
-  LoadRoot(temp, index);
-  Cmp(obj, temp);
-}
-
-
-void MacroAssembler::JumpIfRoot(const Register& obj,
-                                Heap::RootListIndex index,
-                                Label* if_equal) {
-  CompareRoot(obj, index);
-  B(eq, if_equal);
-}
-
-
-void MacroAssembler::JumpIfNotRoot(const Register& obj,
-                                   Heap::RootListIndex index,
-                                   Label* if_not_equal) {
-  CompareRoot(obj, index);
-  B(ne, if_not_equal);
-}
-
-
-void MacroAssembler::CompareAndSplit(const Register& lhs,
-                                     const Operand& rhs,
-                                     Condition cond,
-                                     Label* if_true,
-                                     Label* if_false,
-                                     Label* fall_through) {
-  if ((if_true == if_false) && (if_false == fall_through)) {
-    // Fall through.
-  } else if (if_true == if_false) {
-    B(if_true);
-  } else if (if_false == fall_through) {
-    CompareAndBranch(lhs, rhs, cond, if_true);
-  } else if (if_true == fall_through) {
-    CompareAndBranch(lhs, rhs, InvertCondition(cond), if_false);
-  } else {
-    CompareAndBranch(lhs, rhs, cond, if_true);
-    B(if_false);
-  }
-}
-
-
-void MacroAssembler::TestAndSplit(const Register& reg,
-                                  uint64_t bit_pattern,
-                                  Label* if_all_clear,
-                                  Label* if_any_set,
-                                  Label* fall_through) {
-  if ((if_all_clear == if_any_set) && (if_any_set == fall_through)) {
-    // Fall through.
-  } else if (if_all_clear == if_any_set) {
-    B(if_all_clear);
-  } else if (if_all_clear == fall_through) {
-    TestAndBranchIfAnySet(reg, bit_pattern, if_any_set);
-  } else if (if_any_set == fall_through) {
-    TestAndBranchIfAllClear(reg, bit_pattern, if_all_clear);
-  } else {
-    TestAndBranchIfAnySet(reg, bit_pattern, if_any_set);
-    B(if_all_clear);
-  }
-}
-
-
-void MacroAssembler::CheckFastElements(Register map,
-                                       Register scratch,
-                                       Label* fail) {
-  STATIC_ASSERT(FAST_SMI_ELEMENTS == 0);
-  STATIC_ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
-  STATIC_ASSERT(FAST_ELEMENTS == 2);
-  STATIC_ASSERT(FAST_HOLEY_ELEMENTS == 3);
-  Ldrb(scratch, FieldMemOperand(map, Map::kBitField2Offset));
-  Cmp(scratch, Map::kMaximumBitField2FastHoleyElementValue);
-  B(hi, fail);
-}
-
-
-void MacroAssembler::CheckFastObjectElements(Register map,
-                                             Register scratch,
-                                             Label* fail) {
-  STATIC_ASSERT(FAST_SMI_ELEMENTS == 0);
-  STATIC_ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
-  STATIC_ASSERT(FAST_ELEMENTS == 2);
-  STATIC_ASSERT(FAST_HOLEY_ELEMENTS == 3);
-  Ldrb(scratch, FieldMemOperand(map, Map::kBitField2Offset));
-  Cmp(scratch, Operand(Map::kMaximumBitField2FastHoleySmiElementValue));
-  // If cond==ls, set cond=hi, otherwise compare.
-  Ccmp(scratch,
-       Operand(Map::kMaximumBitField2FastHoleyElementValue), CFlag, hi);
-  B(hi, fail);
-}
-
-
-// Note: The ARM version of this clobbers elements_reg, but this version does
-// not. Some uses of this in A64 assume that elements_reg will be preserved.
-void MacroAssembler::StoreNumberToDoubleElements(Register value_reg,
-                                                 Register key_reg,
-                                                 Register elements_reg,
-                                                 Register scratch1,
-                                                 FPRegister fpscratch1,
-                                                 FPRegister fpscratch2,
-                                                 Label* fail,
-                                                 int elements_offset) {
-  ASSERT(!AreAliased(value_reg, key_reg, elements_reg, scratch1));
-  Label store_num;
-
-  // Speculatively convert the smi to a double - all smis can be exactly
-  // represented as a double.
-  SmiUntagToDouble(fpscratch1, value_reg, kSpeculativeUntag);
-
-  // If value_reg is a smi, we're done.
-  JumpIfSmi(value_reg, &store_num);
-
-  // Ensure that the object is a heap number.
-  CheckMap(value_reg, scratch1, isolate()->factory()->heap_number_map(),
-           fail, DONT_DO_SMI_CHECK);
-
-  Ldr(fpscratch1, FieldMemOperand(value_reg, HeapNumber::kValueOffset));
-  Fmov(fpscratch2, FixedDoubleArray::canonical_not_the_hole_nan_as_double());
-
-  // Check for NaN by comparing the number to itself: NaN comparison will
-  // report unordered, indicated by the overflow flag being set.
-  Fcmp(fpscratch1, fpscratch1);
-  Fcsel(fpscratch1, fpscratch2, fpscratch1, vs);
-
-  // Store the result.
-  Bind(&store_num);
-  Add(scratch1, elements_reg,
-      Operand::UntagSmiAndScale(key_reg, kDoubleSizeLog2));
-  Str(fpscratch1,
-      FieldMemOperand(scratch1,
-                      FixedDoubleArray::kHeaderSize - elements_offset));
-}
-
-
-bool MacroAssembler::AllowThisStubCall(CodeStub* stub) {
-  return has_frame_ || !stub->SometimesSetsUpAFrame();
-}
-
-
-void MacroAssembler::IndexFromHash(Register hash, Register index) {
-  // If the hash field contains an array index pick it out. The assert checks
-  // that the constants for the maximum number of digits for an array index
-  // cached in the hash field and the number of bits reserved for it does not
-  // conflict.
-  ASSERT(TenToThe(String::kMaxCachedArrayIndexLength) <
-         (1 << String::kArrayIndexValueBits));
-  // We want the smi-tagged index in key.  kArrayIndexValueMask has zeros in
-  // the low kHashShift bits.
-  STATIC_ASSERT(kSmiTag == 0);
-  Ubfx(hash, hash, String::kHashShift, String::kArrayIndexValueBits);
-  SmiTag(index, hash);
-}
-
-
-void MacroAssembler::EmitSeqStringSetCharCheck(
-    Register string,
-    Register index,
-    SeqStringSetCharCheckIndexType index_type,
-    Register scratch,
-    uint32_t encoding_mask) {
-  ASSERT(!AreAliased(string, index, scratch));
-
-  if (index_type == kIndexIsSmi) {
-    AssertSmi(index);
-  }
-
-  // Check that string is an object.
-  AssertNotSmi(string, kNonObject);
-
-  // Check that string has an appropriate map.
-  Ldr(scratch, FieldMemOperand(string, HeapObject::kMapOffset));
-  Ldrb(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
-
-  And(scratch, scratch, kStringRepresentationMask | kStringEncodingMask);
-  Cmp(scratch, encoding_mask);
-  Check(eq, kUnexpectedStringType);
-
-  Ldr(scratch, FieldMemOperand(string, String::kLengthOffset));
-  Cmp(index, index_type == kIndexIsSmi ? scratch : Operand::UntagSmi(scratch));
-  Check(lt, kIndexIsTooLarge);
-
-  ASSERT_EQ(0, Smi::FromInt(0));
-  Cmp(index, 0);
-  Check(ge, kIndexIsNegative);
-}
-
-
-void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
-                                            Register scratch1,
-                                            Register scratch2,
-                                            Label* miss) {
-  ASSERT(!AreAliased(holder_reg, scratch1, scratch2));
-  Label same_contexts;
-
-  // Load current lexical context from the stack frame.
-  Ldr(scratch1, MemOperand(fp, StandardFrameConstants::kContextOffset));
-  // In debug mode, make sure the lexical context is set.
-#ifdef DEBUG
-  Cmp(scratch1, 0);
-  Check(ne, kWeShouldNotHaveAnEmptyLexicalContext);
-#endif
-
-  // Load the native context of the current context.
-  int offset =
-      Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
-  Ldr(scratch1, FieldMemOperand(scratch1, offset));
-  Ldr(scratch1, FieldMemOperand(scratch1, GlobalObject::kNativeContextOffset));
-
-  // Check the context is a native context.
-  if (emit_debug_code()) {
-    // Read the first word and compare to the global_context_map.
-    Ldr(scratch2, FieldMemOperand(scratch1, HeapObject::kMapOffset));
-    CompareRoot(scratch2, Heap::kNativeContextMapRootIndex);
-    Check(eq, kExpectedNativeContext);
-  }
-
-  // Check if both contexts are the same.
-  Ldr(scratch2, FieldMemOperand(holder_reg,
-                                JSGlobalProxy::kNativeContextOffset));
-  Cmp(scratch1, scratch2);
-  B(&same_contexts, eq);
-
-  // Check the context is a native context.
-  if (emit_debug_code()) {
-    // We're short on scratch registers here, so use holder_reg as a scratch.
-    Push(holder_reg);
-    Register scratch3 = holder_reg;
-
-    CompareRoot(scratch2, Heap::kNullValueRootIndex);
-    Check(ne, kExpectedNonNullContext);
-
-    Ldr(scratch3, FieldMemOperand(scratch2, HeapObject::kMapOffset));
-    CompareRoot(scratch3, Heap::kNativeContextMapRootIndex);
-    Check(eq, kExpectedNativeContext);
-    Pop(holder_reg);
-  }
-
-  // Check that the security token in the calling global object is
-  // compatible with the security token in the receiving global
-  // object.
-  int token_offset = Context::kHeaderSize +
-                     Context::SECURITY_TOKEN_INDEX * kPointerSize;
-
-  Ldr(scratch1, FieldMemOperand(scratch1, token_offset));
-  Ldr(scratch2, FieldMemOperand(scratch2, token_offset));
-  Cmp(scratch1, scratch2);
-  B(miss, ne);
-
-  Bind(&same_contexts);
-}
-
-
-// Compute the hash code from the untagged key. This must be kept in sync with
-// ComputeIntegerHash in utils.h and KeyedLoadGenericElementStub in
-// code-stub-hydrogen.cc
-void MacroAssembler::GetNumberHash(Register key, Register scratch) {
-  ASSERT(!AreAliased(key, scratch));
-
-  // Xor original key with a seed.
-  LoadRoot(scratch, Heap::kHashSeedRootIndex);
-  Eor(key, key, Operand::UntagSmi(scratch));
-
-  // The algorithm uses 32-bit integer values.
-  key = key.W();
-  scratch = scratch.W();
-
-  // Compute the hash code from the untagged key.  This must be kept in sync
-  // with ComputeIntegerHash in utils.h.
-  //
-  // hash = ~hash + (hash <<1 15);
-  Mvn(scratch, key);
-  Add(key, scratch, Operand(key, LSL, 15));
-  // hash = hash ^ (hash >> 12);
-  Eor(key, key, Operand(key, LSR, 12));
-  // hash = hash + (hash << 2);
-  Add(key, key, Operand(key, LSL, 2));
-  // hash = hash ^ (hash >> 4);
-  Eor(key, key, Operand(key, LSR, 4));
-  // hash = hash * 2057;
-  Mov(scratch, Operand(key, LSL, 11));
-  Add(key, key, Operand(key, LSL, 3));
-  Add(key, key, scratch);
-  // hash = hash ^ (hash >> 16);
-  Eor(key, key, Operand(key, LSR, 16));
-}
-
-
-void MacroAssembler::LoadFromNumberDictionary(Label* miss,
-                                              Register elements,
-                                              Register key,
-                                              Register result,
-                                              Register scratch0,
-                                              Register scratch1,
-                                              Register scratch2,
-                                              Register scratch3) {
-  ASSERT(!AreAliased(elements, key, scratch0, scratch1, scratch2, scratch3));
-
-  Label done;
-
-  SmiUntag(scratch0, key);
-  GetNumberHash(scratch0, scratch1);
-
-  // Compute the capacity mask.
-  Ldrsw(scratch1,
-        UntagSmiFieldMemOperand(elements,
-                                SeededNumberDictionary::kCapacityOffset));
-  Sub(scratch1, scratch1, 1);
-
-  // Generate an unrolled loop that performs a few probes before giving up.
-  for (int i = 0; i < kNumberDictionaryProbes; i++) {
-    // Compute the masked index: (hash + i + i * i) & mask.
-    if (i > 0) {
-      Add(scratch2, scratch0, SeededNumberDictionary::GetProbeOffset(i));
-    } else {
-      Mov(scratch2, scratch0);
-    }
-    And(scratch2, scratch2, scratch1);
-
-    // Scale the index by multiplying by the element size.
-    ASSERT(SeededNumberDictionary::kEntrySize == 3);
-    Add(scratch2, scratch2, Operand(scratch2, LSL, 1));
-
-    // Check if the key is identical to the name.
-    Add(scratch2, elements, Operand(scratch2, LSL, kPointerSizeLog2));
-    Ldr(scratch3,
-        FieldMemOperand(scratch2,
-                        SeededNumberDictionary::kElementsStartOffset));
-    Cmp(key, scratch3);
-    if (i != (kNumberDictionaryProbes - 1)) {
-      B(eq, &done);
-    } else {
-      B(ne, miss);
-    }
-  }
-
-  Bind(&done);
-  // Check that the value is a normal property.
-  const int kDetailsOffset =
-      SeededNumberDictionary::kElementsStartOffset + 2 * kPointerSize;
-  Ldrsw(scratch1, UntagSmiFieldMemOperand(scratch2, kDetailsOffset));
-  TestAndBranchIfAnySet(scratch1, PropertyDetails::TypeField::kMask, miss);
-
-  // Get the value at the masked, scaled index and return.
-  const int kValueOffset =
-      SeededNumberDictionary::kElementsStartOffset + kPointerSize;
-  Ldr(result, FieldMemOperand(scratch2, kValueOffset));
-}
-
-
-void MacroAssembler::RememberedSetHelper(Register object,  // For debug tests.
-                                         Register address,
-                                         Register scratch1,
-                                         SaveFPRegsMode fp_mode,
-                                         RememberedSetFinalAction and_then) {
-  ASSERT(!AreAliased(object, address, scratch1));
-  Label done, store_buffer_overflow;
-  if (emit_debug_code()) {
-    Label ok;
-    JumpIfNotInNewSpace(object, &ok);
-    Abort(kRememberedSetPointerInNewSpace);
-    bind(&ok);
-  }
-  UseScratchRegisterScope temps(this);
-  Register scratch2 = temps.AcquireX();
-
-  // Load store buffer top.
-  Mov(scratch2, ExternalReference::store_buffer_top(isolate()));
-  Ldr(scratch1, MemOperand(scratch2));
-  // Store pointer to buffer and increment buffer top.
-  Str(address, MemOperand(scratch1, kPointerSize, PostIndex));
-  // Write back new top of buffer.
-  Str(scratch1, MemOperand(scratch2));
-  // Call stub on end of buffer.
-  // Check for end of buffer.
-  ASSERT(StoreBuffer::kStoreBufferOverflowBit ==
-         (1 << (14 + kPointerSizeLog2)));
-  if (and_then == kFallThroughAtEnd) {
-    Tbz(scratch1, (14 + kPointerSizeLog2), &done);
-  } else {
-    ASSERT(and_then == kReturnAtEnd);
-    Tbnz(scratch1, (14 + kPointerSizeLog2), &store_buffer_overflow);
-    Ret();
-  }
-
-  Bind(&store_buffer_overflow);
-  Push(lr);
-  StoreBufferOverflowStub store_buffer_overflow_stub =
-      StoreBufferOverflowStub(fp_mode);
-  CallStub(&store_buffer_overflow_stub);
-  Pop(lr);
-
-  Bind(&done);
-  if (and_then == kReturnAtEnd) {
-    Ret();
-  }
-}
-
-
-void MacroAssembler::PopSafepointRegisters() {
-  const int num_unsaved = kNumSafepointRegisters - kNumSafepointSavedRegisters;
-  PopXRegList(kSafepointSavedRegisters);
-  Drop(num_unsaved);
-}
-
-
-void MacroAssembler::PushSafepointRegisters() {
-  // Safepoints expect a block of kNumSafepointRegisters values on the stack, so
-  // adjust the stack for unsaved registers.
-  const int num_unsaved = kNumSafepointRegisters - kNumSafepointSavedRegisters;
-  ASSERT(num_unsaved >= 0);
-  Claim(num_unsaved);
-  PushXRegList(kSafepointSavedRegisters);
-}
-
-
-void MacroAssembler::PushSafepointFPRegisters() {
-  PushCPURegList(CPURegList(CPURegister::kFPRegister, kDRegSizeInBits,
-                            FPRegister::kAllocatableFPRegisters));
-}
-
-
-void MacroAssembler::PopSafepointFPRegisters() {
-  PopCPURegList(CPURegList(CPURegister::kFPRegister, kDRegSizeInBits,
-                           FPRegister::kAllocatableFPRegisters));
-}
-
-
-int MacroAssembler::SafepointRegisterStackIndex(int reg_code) {
-  // Make sure the safepoint registers list is what we expect.
-  ASSERT(CPURegList::GetSafepointSavedRegisters().list() == 0x6ffcffff);
-
-  // Safepoint registers are stored contiguously on the stack, but not all the
-  // registers are saved. The following registers are excluded:
-  //  - x16 and x17 (ip0 and ip1) because they shouldn't be preserved outside of
-  //    the macro assembler.
-  //  - x28 (jssp) because JS stack pointer doesn't need to be included in
-  //    safepoint registers.
-  //  - x31 (csp) because the system stack pointer doesn't need to be included
-  //    in safepoint registers.
-  //
-  // This function implements the mapping of register code to index into the
-  // safepoint register slots.
-  if ((reg_code >= 0) && (reg_code <= 15)) {
-    return reg_code;
-  } else if ((reg_code >= 18) && (reg_code <= 27)) {
-    // Skip ip0 and ip1.
-    return reg_code - 2;
-  } else if ((reg_code == 29) || (reg_code == 30)) {
-    // Also skip jssp.
-    return reg_code - 3;
-  } else {
-    // This register has no safepoint register slot.
-    UNREACHABLE();
-    return -1;
-  }
-}
-
-
-void MacroAssembler::CheckPageFlagSet(const Register& object,
-                                      const Register& scratch,
-                                      int mask,
-                                      Label* if_any_set) {
-  And(scratch, object, ~Page::kPageAlignmentMask);
-  Ldr(scratch, MemOperand(scratch, MemoryChunk::kFlagsOffset));
-  TestAndBranchIfAnySet(scratch, mask, if_any_set);
-}
-
-
-void MacroAssembler::CheckPageFlagClear(const Register& object,
-                                        const Register& scratch,
-                                        int mask,
-                                        Label* if_all_clear) {
-  And(scratch, object, ~Page::kPageAlignmentMask);
-  Ldr(scratch, MemOperand(scratch, MemoryChunk::kFlagsOffset));
-  TestAndBranchIfAllClear(scratch, mask, if_all_clear);
-}
-
-
-void MacroAssembler::RecordWriteField(
-    Register object,
-    int offset,
-    Register value,
-    Register scratch,
-    LinkRegisterStatus lr_status,
-    SaveFPRegsMode save_fp,
-    RememberedSetAction remembered_set_action,
-    SmiCheck smi_check) {
-  // First, check if a write barrier is even needed. The tests below
-  // catch stores of Smis.
-  Label done;
-
-  // Skip the barrier if writing a smi.
-  if (smi_check == INLINE_SMI_CHECK) {
-    JumpIfSmi(value, &done);
-  }
-
-  // Although the object register is tagged, the offset is relative to the start
-  // of the object, so offset must be a multiple of kPointerSize.
-  ASSERT(IsAligned(offset, kPointerSize));
-
-  Add(scratch, object, offset - kHeapObjectTag);
-  if (emit_debug_code()) {
-    Label ok;
-    Tst(scratch, (1 << kPointerSizeLog2) - 1);
-    B(eq, &ok);
-    Abort(kUnalignedCellInWriteBarrier);
-    Bind(&ok);
-  }
-
-  RecordWrite(object,
-              scratch,
-              value,
-              lr_status,
-              save_fp,
-              remembered_set_action,
-              OMIT_SMI_CHECK);
-
-  Bind(&done);
-
-  // Clobber clobbered input registers when running with the debug-code flag
-  // turned on to provoke errors.
-  if (emit_debug_code()) {
-    Mov(value, Operand(BitCast<int64_t>(kZapValue + 4)));
-    Mov(scratch, Operand(BitCast<int64_t>(kZapValue + 8)));
-  }
-}
-
-
-// Will clobber: object, address, value.
-// If lr_status is kLRHasBeenSaved, lr will also be clobbered.
-//
-// The register 'object' contains a heap object pointer. The heap object tag is
-// shifted away.
-void MacroAssembler::RecordWrite(Register object,
-                                 Register address,
-                                 Register value,
-                                 LinkRegisterStatus lr_status,
-                                 SaveFPRegsMode fp_mode,
-                                 RememberedSetAction remembered_set_action,
-                                 SmiCheck smi_check) {
-  ASM_LOCATION("MacroAssembler::RecordWrite");
-  ASSERT(!AreAliased(object, value));
-
-  if (emit_debug_code()) {
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireX();
-
-    Ldr(temp, MemOperand(address));
-    Cmp(temp, value);
-    Check(eq, kWrongAddressOrValuePassedToRecordWrite);
-  }
-
-  // Count number of write barriers in generated code.
-  isolate()->counters()->write_barriers_static()->Increment();
-  // TODO(mstarzinger): Dynamic counter missing.
-
-  // First, check if a write barrier is even needed. The tests below
-  // catch stores of smis and stores into the young generation.
-  Label done;
-
-  if (smi_check == INLINE_SMI_CHECK) {
-    ASSERT_EQ(0, kSmiTag);
-    JumpIfSmi(value, &done);
-  }
-
-  CheckPageFlagClear(value,
-                     value,  // Used as scratch.
-                     MemoryChunk::kPointersToHereAreInterestingMask,
-                     &done);
-  CheckPageFlagClear(object,
-                     value,  // Used as scratch.
-                     MemoryChunk::kPointersFromHereAreInterestingMask,
-                     &done);
-
-  // Record the actual write.
-  if (lr_status == kLRHasNotBeenSaved) {
-    Push(lr);
-  }
-  RecordWriteStub stub(object, value, address, remembered_set_action, fp_mode);
-  CallStub(&stub);
-  if (lr_status == kLRHasNotBeenSaved) {
-    Pop(lr);
-  }
-
-  Bind(&done);
-
-  // Clobber clobbered registers when running with the debug-code flag
-  // turned on to provoke errors.
-  if (emit_debug_code()) {
-    Mov(address, Operand(BitCast<int64_t>(kZapValue + 12)));
-    Mov(value, Operand(BitCast<int64_t>(kZapValue + 16)));
-  }
-}
-
-
-void MacroAssembler::AssertHasValidColor(const Register& reg) {
-  if (emit_debug_code()) {
-    // The bit sequence is backward. The first character in the string
-    // represents the least significant bit.
-    ASSERT(strcmp(Marking::kImpossibleBitPattern, "01") == 0);
-
-    Label color_is_valid;
-    Tbnz(reg, 0, &color_is_valid);
-    Tbz(reg, 1, &color_is_valid);
-    Abort(kUnexpectedColorFound);
-    Bind(&color_is_valid);
-  }
-}
-
-
-void MacroAssembler::GetMarkBits(Register addr_reg,
-                                 Register bitmap_reg,
-                                 Register shift_reg) {
-  ASSERT(!AreAliased(addr_reg, bitmap_reg, shift_reg));
-  ASSERT(addr_reg.Is64Bits() && bitmap_reg.Is64Bits() && shift_reg.Is64Bits());
-  // addr_reg is divided into fields:
-  // |63        page base        20|19    high      8|7   shift   3|2  0|
-  // 'high' gives the index of the cell holding color bits for the object.
-  // 'shift' gives the offset in the cell for this object's color.
-  const int kShiftBits = kPointerSizeLog2 + Bitmap::kBitsPerCellLog2;
-  UseScratchRegisterScope temps(this);
-  Register temp = temps.AcquireX();
-  Ubfx(temp, addr_reg, kShiftBits, kPageSizeBits - kShiftBits);
-  Bic(bitmap_reg, addr_reg, Page::kPageAlignmentMask);
-  Add(bitmap_reg, bitmap_reg, Operand(temp, LSL, Bitmap::kBytesPerCellLog2));
-  // bitmap_reg:
-  // |63        page base        20|19 zeros 15|14      high      3|2  0|
-  Ubfx(shift_reg, addr_reg, kPointerSizeLog2, Bitmap::kBitsPerCellLog2);
-}
-
-
-void MacroAssembler::HasColor(Register object,
-                              Register bitmap_scratch,
-                              Register shift_scratch,
-                              Label* has_color,
-                              int first_bit,
-                              int second_bit) {
-  // See mark-compact.h for color definitions.
-  ASSERT(!AreAliased(object, bitmap_scratch, shift_scratch));
-
-  GetMarkBits(object, bitmap_scratch, shift_scratch);
-  Ldr(bitmap_scratch, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
-  // Shift the bitmap down to get the color of the object in bits [1:0].
-  Lsr(bitmap_scratch, bitmap_scratch, shift_scratch);
-
-  AssertHasValidColor(bitmap_scratch);
-
-  // These bit sequences are backwards. The first character in the string
-  // represents the least significant bit.
-  ASSERT(strcmp(Marking::kWhiteBitPattern, "00") == 0);
-  ASSERT(strcmp(Marking::kBlackBitPattern, "10") == 0);
-  ASSERT(strcmp(Marking::kGreyBitPattern, "11") == 0);
-
-  // Check for the color.
-  if (first_bit == 0) {
-    // Checking for white.
-    ASSERT(second_bit == 0);
-    // We only need to test the first bit.
-    Tbz(bitmap_scratch, 0, has_color);
-  } else {
-    Label other_color;
-    // Checking for grey or black.
-    Tbz(bitmap_scratch, 0, &other_color);
-    if (second_bit == 0) {
-      Tbz(bitmap_scratch, 1, has_color);
-    } else {
-      Tbnz(bitmap_scratch, 1, has_color);
-    }
-    Bind(&other_color);
-  }
-
-  // Fall through if it does not have the right color.
-}
-
-
-void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
-                                        Register scratch,
-                                        Label* if_deprecated) {
-  if (map->CanBeDeprecated()) {
-    Mov(scratch, Operand(map));
-    Ldrsw(scratch, UntagSmiFieldMemOperand(scratch, Map::kBitField3Offset));
-    TestAndBranchIfAnySet(scratch, Map::Deprecated::kMask, if_deprecated);
-  }
-}
-
-
-void MacroAssembler::JumpIfBlack(Register object,
-                                 Register scratch0,
-                                 Register scratch1,
-                                 Label* on_black) {
-  ASSERT(strcmp(Marking::kBlackBitPattern, "10") == 0);
-  HasColor(object, scratch0, scratch1, on_black, 1, 0);  // kBlackBitPattern.
-}
-
-
-void MacroAssembler::JumpIfDictionaryInPrototypeChain(
-    Register object,
-    Register scratch0,
-    Register scratch1,
-    Label* found) {
-  ASSERT(!AreAliased(object, scratch0, scratch1));
-  Factory* factory = isolate()->factory();
-  Register current = scratch0;
-  Label loop_again;
-
-  // Scratch contains elements pointer.
-  Mov(current, object);
-
-  // Loop based on the map going up the prototype chain.
-  Bind(&loop_again);
-  Ldr(current, FieldMemOperand(current, HeapObject::kMapOffset));
-  Ldrb(scratch1, FieldMemOperand(current, Map::kBitField2Offset));
-  Ubfx(scratch1, scratch1, Map::kElementsKindShift, Map::kElementsKindBitCount);
-  CompareAndBranch(scratch1, DICTIONARY_ELEMENTS, eq, found);
-  Ldr(current, FieldMemOperand(current, Map::kPrototypeOffset));
-  CompareAndBranch(current, Operand(factory->null_value()), ne, &loop_again);
-}
-
-
-void MacroAssembler::GetRelocatedValueLocation(Register ldr_location,
-                                               Register result) {
-  ASSERT(!result.Is(ldr_location));
-  const uint32_t kLdrLitOffset_lsb = 5;
-  const uint32_t kLdrLitOffset_width = 19;
-  Ldr(result, MemOperand(ldr_location));
-  if (emit_debug_code()) {
-    And(result, result, LoadLiteralFMask);
-    Cmp(result, LoadLiteralFixed);
-    Check(eq, kTheInstructionToPatchShouldBeAnLdrLiteral);
-    // The instruction was clobbered. Reload it.
-    Ldr(result, MemOperand(ldr_location));
-  }
-  Sbfx(result, result, kLdrLitOffset_lsb, kLdrLitOffset_width);
-  Add(result, ldr_location, Operand(result, LSL, kWordSizeInBytesLog2));
-}
-
-
-void MacroAssembler::EnsureNotWhite(
-    Register value,
-    Register bitmap_scratch,
-    Register shift_scratch,
-    Register load_scratch,
-    Register length_scratch,
-    Label* value_is_white_and_not_data) {
-  ASSERT(!AreAliased(
-      value, bitmap_scratch, shift_scratch, load_scratch, length_scratch));
-
-  // These bit sequences are backwards. The first character in the string
-  // represents the least significant bit.
-  ASSERT(strcmp(Marking::kWhiteBitPattern, "00") == 0);
-  ASSERT(strcmp(Marking::kBlackBitPattern, "10") == 0);
-  ASSERT(strcmp(Marking::kGreyBitPattern, "11") == 0);
-
-  GetMarkBits(value, bitmap_scratch, shift_scratch);
-  Ldr(load_scratch, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
-  Lsr(load_scratch, load_scratch, shift_scratch);
-
-  AssertHasValidColor(load_scratch);
-
-  // If the value is black or grey we don't need to do anything.
-  // Since both black and grey have a 1 in the first position and white does
-  // not have a 1 there we only need to check one bit.
-  Label done;
-  Tbnz(load_scratch, 0, &done);
-
-  // Value is white.  We check whether it is data that doesn't need scanning.
-  Register map = load_scratch;  // Holds map while checking type.
-  Label is_data_object;
-
-  // Check for heap-number.
-  Ldr(map, FieldMemOperand(value, HeapObject::kMapOffset));
-  Mov(length_scratch, HeapNumber::kSize);
-  JumpIfRoot(map, Heap::kHeapNumberMapRootIndex, &is_data_object);
-
-  // Check for strings.
-  ASSERT(kIsIndirectStringTag == 1 && kIsIndirectStringMask == 1);
-  ASSERT(kNotStringTag == 0x80 && kIsNotStringMask == 0x80);
-  // If it's a string and it's not a cons string then it's an object containing
-  // no GC pointers.
-  Register instance_type = load_scratch;
-  Ldrb(instance_type, FieldMemOperand(map, Map::kInstanceTypeOffset));
-  TestAndBranchIfAnySet(instance_type,
-                        kIsIndirectStringMask | kIsNotStringMask,
-                        value_is_white_and_not_data);
-
-  // It's a non-indirect (non-cons and non-slice) string.
-  // If it's external, the length is just ExternalString::kSize.
-  // Otherwise it's String::kHeaderSize + string->length() * (1 or 2).
-  // External strings are the only ones with the kExternalStringTag bit
-  // set.
-  ASSERT_EQ(0, kSeqStringTag & kExternalStringTag);
-  ASSERT_EQ(0, kConsStringTag & kExternalStringTag);
-  Mov(length_scratch, ExternalString::kSize);
-  TestAndBranchIfAnySet(instance_type, kExternalStringTag, &is_data_object);
-
-  // Sequential string, either ASCII or UC16.
-  // For ASCII (char-size of 1) we shift the smi tag away to get the length.
-  // For UC16 (char-size of 2) we just leave the smi tag in place, thereby
-  // getting the length multiplied by 2.
-  ASSERT(kOneByteStringTag == 4 && kStringEncodingMask == 4);
-  Ldrsw(length_scratch, UntagSmiFieldMemOperand(value,
-                                                String::kLengthOffset));
-  Tst(instance_type, kStringEncodingMask);
-  Cset(load_scratch, eq);
-  Lsl(length_scratch, length_scratch, load_scratch);
-  Add(length_scratch,
-      length_scratch,
-      SeqString::kHeaderSize + kObjectAlignmentMask);
-  Bic(length_scratch, length_scratch, kObjectAlignmentMask);
-
-  Bind(&is_data_object);
-  // Value is a data object, and it is white.  Mark it black.  Since we know
-  // that the object is white we can make it black by flipping one bit.
-  Register mask = shift_scratch;
-  Mov(load_scratch, 1);
-  Lsl(mask, load_scratch, shift_scratch);
-
-  Ldr(load_scratch, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
-  Orr(load_scratch, load_scratch, mask);
-  Str(load_scratch, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
-
-  Bic(bitmap_scratch, bitmap_scratch, Page::kPageAlignmentMask);
-  Ldr(load_scratch, MemOperand(bitmap_scratch, MemoryChunk::kLiveBytesOffset));
-  Add(load_scratch, load_scratch, length_scratch);
-  Str(load_scratch, MemOperand(bitmap_scratch, MemoryChunk::kLiveBytesOffset));
-
-  Bind(&done);
-}
-
-
-void MacroAssembler::Assert(Condition cond, BailoutReason reason) {
-  if (emit_debug_code()) {
-    Check(cond, reason);
-  }
-}
-
-
-
-void MacroAssembler::AssertRegisterIsClear(Register reg, BailoutReason reason) {
-  if (emit_debug_code()) {
-    CheckRegisterIsClear(reg, reason);
-  }
-}
-
-
-void MacroAssembler::AssertRegisterIsRoot(Register reg,
-                                          Heap::RootListIndex index,
-                                          BailoutReason reason) {
-  if (emit_debug_code()) {
-    CompareRoot(reg, index);
-    Check(eq, reason);
-  }
-}
-
-
-void MacroAssembler::AssertFastElements(Register elements) {
-  if (emit_debug_code()) {
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireX();
-    Label ok;
-    Ldr(temp, FieldMemOperand(elements, HeapObject::kMapOffset));
-    JumpIfRoot(temp, Heap::kFixedArrayMapRootIndex, &ok);
-    JumpIfRoot(temp, Heap::kFixedDoubleArrayMapRootIndex, &ok);
-    JumpIfRoot(temp, Heap::kFixedCOWArrayMapRootIndex, &ok);
-    Abort(kJSObjectWithFastElementsMapHasSlowElements);
-    Bind(&ok);
-  }
-}
-
-
-void MacroAssembler::AssertIsString(const Register& object) {
-  if (emit_debug_code()) {
-    UseScratchRegisterScope temps(this);
-    Register temp = temps.AcquireX();
-    STATIC_ASSERT(kSmiTag == 0);
-    Tst(object, kSmiTagMask);
-    Check(ne, kOperandIsNotAString);
-    Ldr(temp, FieldMemOperand(object, HeapObject::kMapOffset));
-    CompareInstanceType(temp, temp, FIRST_NONSTRING_TYPE);
-    Check(lo, kOperandIsNotAString);
-  }
-}
-
-
-void MacroAssembler::Check(Condition cond, BailoutReason reason) {
-  Label ok;
-  B(cond, &ok);
-  Abort(reason);
-  // Will not return here.
-  Bind(&ok);
-}
-
-
-void MacroAssembler::CheckRegisterIsClear(Register reg, BailoutReason reason) {
-  Label ok;
-  Cbz(reg, &ok);
-  Abort(reason);
-  // Will not return here.
-  Bind(&ok);
-}
-
-
-void MacroAssembler::Abort(BailoutReason reason) {
-#ifdef DEBUG
-  RecordComment("Abort message: ");
-  RecordComment(GetBailoutReason(reason));
-
-  if (FLAG_trap_on_abort) {
-    Brk(0);
-    return;
-  }
-#endif
-
-  // Abort is used in some contexts where csp is the stack pointer. In order to
-  // simplify the CallRuntime code, make sure that jssp is the stack pointer.
-  // There is no risk of register corruption here because Abort doesn't return.
-  Register old_stack_pointer = StackPointer();
-  SetStackPointer(jssp);
-  Mov(jssp, old_stack_pointer);
-
-  // We need some scratch registers for the MacroAssembler, so make sure we have
-  // some. This is safe here because Abort never returns.
-  RegList old_tmp_list = TmpList()->list();
-  TmpList()->Combine(ip0);
-  TmpList()->Combine(ip1);
-
-  if (use_real_aborts()) {
-    // Avoid infinite recursion; Push contains some assertions that use Abort.
-    NoUseRealAbortsScope no_real_aborts(this);
-
-    Mov(x0, Smi::FromInt(reason));
-    Push(x0);
-
-    if (!has_frame_) {
-      // We don't actually want to generate a pile of code for this, so just
-      // claim there is a stack frame, without generating one.
-      FrameScope scope(this, StackFrame::NONE);
-      CallRuntime(Runtime::kAbort, 1);
-    } else {
-      CallRuntime(Runtime::kAbort, 1);
-    }
-  } else {
-    // Load the string to pass to Printf.
-    Label msg_address;
-    Adr(x0, &msg_address);
-
-    // Call Printf directly to report the error.
-    CallPrintf();
-
-    // We need a way to stop execution on both the simulator and real hardware,
-    // and Unreachable() is the best option.
-    Unreachable();
-
-    // Emit the message string directly in the instruction stream.
-    {
-      BlockPoolsScope scope(this);
-      Bind(&msg_address);
-      EmitStringData(GetBailoutReason(reason));
-    }
-  }
-
-  SetStackPointer(old_stack_pointer);
-  TmpList()->set_list(old_tmp_list);
-}
-
-
-void MacroAssembler::LoadTransitionedArrayMapConditional(
-    ElementsKind expected_kind,
-    ElementsKind transitioned_kind,
-    Register map_in_out,
-    Register scratch1,
-    Register scratch2,
-    Label* no_map_match) {
-  // Load the global or builtins object from the current context.
-  Ldr(scratch1, GlobalObjectMemOperand());
-  Ldr(scratch1, FieldMemOperand(scratch1, GlobalObject::kNativeContextOffset));
-
-  // Check that the function's map is the same as the expected cached map.
-  Ldr(scratch1, ContextMemOperand(scratch1, Context::JS_ARRAY_MAPS_INDEX));
-  size_t offset = (expected_kind * kPointerSize) + FixedArrayBase::kHeaderSize;
-  Ldr(scratch2, FieldMemOperand(scratch1, offset));
-  Cmp(map_in_out, scratch2);
-  B(ne, no_map_match);
-
-  // Use the transitioned cached map.
-  offset = (transitioned_kind * kPointerSize) + FixedArrayBase::kHeaderSize;
-  Ldr(map_in_out, FieldMemOperand(scratch1, offset));
-}
-
-
-void MacroAssembler::LoadGlobalFunction(int index, Register function) {
-  // Load the global or builtins object from the current context.
-  Ldr(function, GlobalObjectMemOperand());
-  // Load the native context from the global or builtins object.
-  Ldr(function, FieldMemOperand(function,
-                                GlobalObject::kNativeContextOffset));
-  // Load the function from the native context.
-  Ldr(function, ContextMemOperand(function, index));
-}
-
-
-void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
-                                                  Register map,
-                                                  Register scratch) {
-  // Load the initial map. The global functions all have initial maps.
-  Ldr(map, FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
-  if (emit_debug_code()) {
-    Label ok, fail;
-    CheckMap(map, scratch, Heap::kMetaMapRootIndex, &fail, DO_SMI_CHECK);
-    B(&ok);
-    Bind(&fail);
-    Abort(kGlobalFunctionsMustHaveInitialMap);
-    Bind(&ok);
-  }
-}
-
-
-// This is the main Printf implementation. All other Printf variants call
-// PrintfNoPreserve after setting up one or more PreserveRegisterScopes.
-void MacroAssembler::PrintfNoPreserve(const char * format,
-                                      const CPURegister& arg0,
-                                      const CPURegister& arg1,
-                                      const CPURegister& arg2,
-                                      const CPURegister& arg3) {
-  // We cannot handle a caller-saved stack pointer. It doesn't make much sense
-  // in most cases anyway, so this restriction shouldn't be too serious.
-  ASSERT(!kCallerSaved.IncludesAliasOf(__ StackPointer()));
-
-  // Make sure that the macro assembler doesn't try to use any of our arguments
-  // as scratch registers.
-  ASSERT(!TmpList()->IncludesAliasOf(arg0, arg1, arg2, arg3));
-  ASSERT(!FPTmpList()->IncludesAliasOf(arg0, arg1, arg2, arg3));
-
-  // We cannot print the stack pointer because it is typically used to preserve
-  // caller-saved registers (using other Printf variants which depend on this
-  // helper).
-  ASSERT(!AreAliased(arg0, StackPointer()));
-  ASSERT(!AreAliased(arg1, StackPointer()));
-  ASSERT(!AreAliased(arg2, StackPointer()));
-  ASSERT(!AreAliased(arg3, StackPointer()));
-
-  static const int kMaxArgCount = 4;
-  // Assume that we have the maximum number of arguments until we know
-  // otherwise.
-  int arg_count = kMaxArgCount;
-
-  // The provided arguments.
-  CPURegister args[kMaxArgCount] = {arg0, arg1, arg2, arg3};
-
-  // The PCS registers where the arguments need to end up.
-  CPURegister pcs[kMaxArgCount] = {NoCPUReg, NoCPUReg, NoCPUReg, NoCPUReg};
-
-  // Promote FP arguments to doubles, and integer arguments to X registers.
-  // Note that FP and integer arguments cannot be mixed, but we'll check
-  // AreSameSizeAndType once we've processed these promotions.
-  for (int i = 0; i < kMaxArgCount; i++) {
-    if (args[i].IsRegister()) {
-      // Note that we use x1 onwards, because x0 will hold the format string.
-      pcs[i] = Register::XRegFromCode(i + 1);
-      // For simplicity, we handle all integer arguments as X registers. An X
-      // register argument takes the same space as a W register argument in the
-      // PCS anyway. The only limitation is that we must explicitly clear the
-      // top word for W register arguments as the callee will expect it to be
-      // clear.
-      if (!args[i].Is64Bits()) {
-        const Register& as_x = args[i].X();
-        And(as_x, as_x, 0x00000000ffffffff);
-        args[i] = as_x;
-      }
-    } else if (args[i].IsFPRegister()) {
-      pcs[i] = FPRegister::DRegFromCode(i);
-      // C and C++ varargs functions (such as printf) implicitly promote float
-      // arguments to doubles.
-      if (!args[i].Is64Bits()) {
-        FPRegister s(args[i]);
-        const FPRegister& as_d = args[i].D();
-        Fcvt(as_d, s);
-        args[i] = as_d;
-      }
-    } else {
-      // This is the first empty (NoCPUReg) argument, so use it to set the
-      // argument count and bail out.
-      arg_count = i;
-      break;
-    }
-  }
-  ASSERT((arg_count >= 0) && (arg_count <= kMaxArgCount));
-  // Check that every remaining argument is NoCPUReg.
-  for (int i = arg_count; i < kMaxArgCount; i++) {
-    ASSERT(args[i].IsNone());
-  }
-  ASSERT((arg_count == 0) || AreSameSizeAndType(args[0], args[1],
-                                                args[2], args[3],
-                                                pcs[0], pcs[1],
-                                                pcs[2], pcs[3]));
-
-  // Move the arguments into the appropriate PCS registers.
-  //
-  // Arranging an arbitrary list of registers into x1-x4 (or d0-d3) is
-  // surprisingly complicated.
-  //
-  //  * For even numbers of registers, we push the arguments and then pop them
-  //    into their final registers. This maintains 16-byte stack alignment in
-  //    case csp is the stack pointer, since we're only handling X or D
-  //    registers at this point.
-  //
-  //  * For odd numbers of registers, we push and pop all but one register in
-  //    the same way, but the left-over register is moved directly, since we
-  //    can always safely move one register without clobbering any source.
-  if (arg_count >= 4) {
-    Push(args[3], args[2], args[1], args[0]);
-  } else if (arg_count >= 2) {
-    Push(args[1], args[0]);
-  }
-
-  if ((arg_count % 2) != 0) {
-    // Move the left-over register directly.
-    const CPURegister& leftover_arg = args[arg_count - 1];
-    const CPURegister& leftover_pcs = pcs[arg_count - 1];
-    if (leftover_arg.IsRegister()) {
-      Mov(Register(leftover_pcs), Register(leftover_arg));
-    } else {
-      Fmov(FPRegister(leftover_pcs), FPRegister(leftover_arg));
-    }
-  }
-
-  if (arg_count >= 4) {
-    Pop(pcs[0], pcs[1], pcs[2], pcs[3]);
-  } else if (arg_count >= 2) {
-    Pop(pcs[0], pcs[1]);
-  }
-
-  // Load the format string into x0, as per the procedure-call standard.
-  //
-  // To make the code as portable as possible, the format string is encoded
-  // directly in the instruction stream. It might be cleaner to encode it in a
-  // literal pool, but since Printf is usually used for debugging, it is
-  // beneficial for it to be minimally dependent on other features.
-  Label format_address;
-  Adr(x0, &format_address);
-
-  // Emit the format string directly in the instruction stream.
-  { BlockPoolsScope scope(this);
-    Label after_data;
-    B(&after_data);
-    Bind(&format_address);
-    EmitStringData(format);
-    Unreachable();
-    Bind(&after_data);
-  }
-
-  // We don't pass any arguments on the stack, but we still need to align the C
-  // stack pointer to a 16-byte boundary for PCS compliance.
-  if (!csp.Is(StackPointer())) {
-    Bic(csp, StackPointer(), 0xf);
-  }
-
-  CallPrintf(pcs[0].type());
-}
-
-
-void MacroAssembler::CallPrintf(CPURegister::RegisterType type) {
-  // A call to printf needs special handling for the simulator, since the system
-  // printf function will use a different instruction set and the procedure-call
-  // standard will not be compatible.
-#ifdef USE_SIMULATOR
-  { InstructionAccurateScope scope(this, kPrintfLength / kInstructionSize);
-    hlt(kImmExceptionIsPrintf);
-    dc32(type);
-  }
-#else
-  Call(FUNCTION_ADDR(printf), RelocInfo::EXTERNAL_REFERENCE);
-#endif
-}
-
-
-void MacroAssembler::Printf(const char * format,
-                            const CPURegister& arg0,
-                            const CPURegister& arg1,
-                            const CPURegister& arg2,
-                            const CPURegister& arg3) {
-  // Printf is expected to preserve all registers, so make sure that none are
-  // available as scratch registers until we've preserved them.
-  RegList old_tmp_list = TmpList()->list();
-  RegList old_fp_tmp_list = FPTmpList()->list();
-  TmpList()->set_list(0);
-  FPTmpList()->set_list(0);
-
-  // Preserve all caller-saved registers as well as NZCV.
-  // If csp is the stack pointer, PushCPURegList asserts that the size of each
-  // list is a multiple of 16 bytes.
-  PushCPURegList(kCallerSaved);
-  PushCPURegList(kCallerSavedFP);
-
-  // We can use caller-saved registers as scratch values (except for argN).
-  CPURegList tmp_list = kCallerSaved;
-  CPURegList fp_tmp_list = kCallerSavedFP;
-  tmp_list.Remove(arg0, arg1, arg2, arg3);
-  fp_tmp_list.Remove(arg0, arg1, arg2, arg3);
-  TmpList()->set_list(tmp_list.list());
-  FPTmpList()->set_list(fp_tmp_list.list());
-
-  // Preserve NZCV.
-  { UseScratchRegisterScope temps(this);
-    Register tmp = temps.AcquireX();
-    Mrs(tmp, NZCV);
-    Push(tmp, xzr);
-  }
-
-  PrintfNoPreserve(format, arg0, arg1, arg2, arg3);
-
-  { UseScratchRegisterScope temps(this);
-    Register tmp = temps.AcquireX();
-    Pop(xzr, tmp);
-    Msr(NZCV, tmp);
-  }
-
-  PopCPURegList(kCallerSavedFP);
-  PopCPURegList(kCallerSaved);
-
-  TmpList()->set_list(old_tmp_list);
-  FPTmpList()->set_list(old_fp_tmp_list);
-}
-
-
-void MacroAssembler::EmitFrameSetupForCodeAgePatching() {
-  // TODO(jbramley): Other architectures use the internal memcpy to copy the
-  // sequence. If this is a performance bottleneck, we should consider caching
-  // the sequence and copying it in the same way.
-  InstructionAccurateScope scope(this, kCodeAgeSequenceSize / kInstructionSize);
-  ASSERT(jssp.Is(StackPointer()));
-  EmitFrameSetupForCodeAgePatching(this);
-}
-
-
-
-void MacroAssembler::EmitCodeAgeSequence(Code* stub) {
-  InstructionAccurateScope scope(this, kCodeAgeSequenceSize / kInstructionSize);
-  ASSERT(jssp.Is(StackPointer()));
-  EmitCodeAgeSequence(this, stub);
-}
-
-
-#undef __
-#define __ assm->
-
-
-void MacroAssembler::EmitFrameSetupForCodeAgePatching(Assembler * assm) {
-  Label start;
-  __ bind(&start);
-
-  // We can do this sequence using four instructions, but the code ageing
-  // sequence that patches it needs five, so we use the extra space to try to
-  // simplify some addressing modes and remove some dependencies (compared to
-  // using two stp instructions with write-back).
-  __ sub(jssp, jssp, 4 * kXRegSize);
-  __ sub(csp, csp, 4 * kXRegSize);
-  __ stp(x1, cp, MemOperand(jssp, 0 * kXRegSize));
-  __ stp(fp, lr, MemOperand(jssp, 2 * kXRegSize));
-  __ add(fp, jssp, StandardFrameConstants::kFixedFrameSizeFromFp);
-
-  __ AssertSizeOfCodeGeneratedSince(&start, kCodeAgeSequenceSize);
-}
-
-
-void MacroAssembler::EmitCodeAgeSequence(Assembler * assm,
-                                         Code * stub) {
-  Label start;
-  __ bind(&start);
-  // When the stub is called, the sequence is replaced with the young sequence
-  // (as in EmitFrameSetupForCodeAgePatching). After the code is replaced, the
-  // stub jumps to &start, stored in x0. The young sequence does not call the
-  // stub so there is no infinite loop here.
-  //
-  // A branch (br) is used rather than a call (blr) because this code replaces
-  // the frame setup code that would normally preserve lr.
-  __ LoadLiteral(ip0, kCodeAgeStubEntryOffset);
-  __ adr(x0, &start);
-  __ br(ip0);
-  // IsCodeAgeSequence in codegen-a64.cc assumes that the code generated up
-  // until now (kCodeAgeStubEntryOffset) is the same for all code age sequences.
-  __ AssertSizeOfCodeGeneratedSince(&start, kCodeAgeStubEntryOffset);
-  if (stub) {
-    __ dc64(reinterpret_cast<uint64_t>(stub->instruction_start()));
-    __ AssertSizeOfCodeGeneratedSince(&start, kCodeAgeSequenceSize);
-  }
-}
-
-
-bool MacroAssembler::IsYoungSequence(byte* sequence) {
-  // Generate a young sequence to compare with.
-  const int length = kCodeAgeSequenceSize / kInstructionSize;
-  static bool initialized = false;
-  static byte young[kCodeAgeSequenceSize];
-  if (!initialized) {
-    PatchingAssembler patcher(young, length);
-    // The young sequence is the frame setup code for FUNCTION code types. It is
-    // generated by FullCodeGenerator::Generate.
-    MacroAssembler::EmitFrameSetupForCodeAgePatching(&patcher);
-    initialized = true;
-  }
-
-  bool is_young = (memcmp(sequence, young, kCodeAgeSequenceSize) == 0);
-  ASSERT(is_young || IsCodeAgeSequence(sequence));
-  return is_young;
-}
-
-
-#ifdef DEBUG
-bool MacroAssembler::IsCodeAgeSequence(byte* sequence) {
-  // The old sequence varies depending on the code age. However, the code up
-  // until kCodeAgeStubEntryOffset does not change, so we can check that part to
-  // get a reasonable level of verification.
-  const int length = kCodeAgeStubEntryOffset / kInstructionSize;
-  static bool initialized = false;
-  static byte old[kCodeAgeStubEntryOffset];
-  if (!initialized) {
-    PatchingAssembler patcher(old, length);
-    MacroAssembler::EmitCodeAgeSequence(&patcher, NULL);
-    initialized = true;
-  }
-  return memcmp(sequence, old, kCodeAgeStubEntryOffset) == 0;
-}
-#endif
-
-
-void MacroAssembler::TruncatingDiv(Register result,
-                                   Register dividend,
-                                   int32_t divisor) {
-  ASSERT(!AreAliased(result, dividend));
-  ASSERT(result.Is32Bits() && dividend.Is32Bits());
-  MultiplierAndShift ms(divisor);
-  Mov(result, ms.multiplier());
-  Smull(result.X(), dividend, result);
-  Asr(result.X(), result.X(), 32);
-  if (divisor > 0 && ms.multiplier() < 0) Add(result, result, dividend);
-  if (divisor < 0 && ms.multiplier() > 0) Sub(result, result, dividend);
-  if (ms.shift() > 0) Asr(result, result, ms.shift());
-  Add(result, result, Operand(dividend, LSR, 31));
-}
-
-
-#undef __
-
-
-UseScratchRegisterScope::~UseScratchRegisterScope() {
-  available_->set_list(old_available_);
-  availablefp_->set_list(old_availablefp_);
-}
-
-
-Register UseScratchRegisterScope::AcquireSameSizeAs(const Register& reg) {
-  int code = AcquireNextAvailable(available_).code();
-  return Register::Create(code, reg.SizeInBits());
-}
-
-
-FPRegister UseScratchRegisterScope::AcquireSameSizeAs(const FPRegister& reg) {
-  int code = AcquireNextAvailable(availablefp_).code();
-  return FPRegister::Create(code, reg.SizeInBits());
-}
-
-
-CPURegister UseScratchRegisterScope::AcquireNextAvailable(
-    CPURegList* available) {
-  CHECK(!available->IsEmpty());
-  CPURegister result = available->PopLowestIndex();
-  ASSERT(!AreAliased(result, xzr, csp));
-  return result;
-}
-
-
-#define __ masm->
-
-
-void InlineSmiCheckInfo::Emit(MacroAssembler* masm, const Register& reg,
-                              const Label* smi_check) {
-  Assembler::BlockPoolsScope scope(masm);
-  if (reg.IsValid()) {
-    ASSERT(smi_check->is_bound());
-    ASSERT(reg.Is64Bits());
-
-    // Encode the register (x0-x30) in the lowest 5 bits, then the offset to
-    // 'check' in the other bits. The possible offset is limited in that we
-    // use BitField to pack the data, and the underlying data type is a
-    // uint32_t.
-    uint32_t delta = __ InstructionsGeneratedSince(smi_check);
-    __ InlineData(RegisterBits::encode(reg.code()) | DeltaBits::encode(delta));
-  } else {
-    ASSERT(!smi_check->is_bound());
-
-    // An offset of 0 indicates that there is no patch site.
-    __ InlineData(0);
-  }
-}
-
-
-InlineSmiCheckInfo::InlineSmiCheckInfo(Address info)
-    : reg_(NoReg), smi_check_(NULL) {
-  InstructionSequence* inline_data = InstructionSequence::At(info);
-  ASSERT(inline_data->IsInlineData());
-  if (inline_data->IsInlineData()) {
-    uint64_t payload = inline_data->InlineData();
-    // We use BitField to decode the payload, and BitField can only handle
-    // 32-bit values.
-    ASSERT(is_uint32(payload));
-    if (payload != 0) {
-      int reg_code = RegisterBits::decode(payload);
-      reg_ = Register::XRegFromCode(reg_code);
-      uint64_t smi_check_delta = DeltaBits::decode(payload);
-      ASSERT(smi_check_delta != 0);
-      smi_check_ = inline_data->preceding(smi_check_delta);
-    }
-  }
-}
-
-
-#undef __
-
-
-} }  // namespace v8::internal
-
-#endif  // V8_TARGET_ARCH_A64