Contribution of PowerPC port.

src/ppc/macro-assembler-ppc.cc

+// Copyright 2012 the V8 project authors. All rights reserved.
+//
+// Copyright IBM Corp. 2012, 2013. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <assert.h>  // For assert
+#include <limits.h>  // For LONG_MIN, LONG_MAX.
+
+#include "src/v8.h"
+
+#if V8_TARGET_ARCH_PPC
+
+#include "src/bootstrapper.h"
+#include "src/codegen.h"
+#include "src/cpu-profiler.h"
+#include "src/debug.h"
+#include "src/isolate-inl.h"
+#include "src/runtime.h"
+
+namespace v8 {
+namespace internal {
+
+MacroAssembler::MacroAssembler(Isolate* arg_isolate, void* buffer, int size)
+    : Assembler(arg_isolate, buffer, size),
+      generating_stub_(false),
+      has_frame_(false) {
+  if (isolate() != NULL) {
+    code_object_ =
+        Handle<Object>(isolate()->heap()->undefined_value(), isolate());
+  }
+}
+
+
+void MacroAssembler::Jump(Register target, Condition cond) {
+  DCHECK(cond == al);
+  mtctr(target);
+  bctr();
+}
+
+
+void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode,
+                          Condition cond, CRegister cr) {
+  Label skip;
+
+  if (cond != al) b(NegateCondition(cond), &skip, cr);
+
+  DCHECK(rmode == RelocInfo::CODE_TARGET || rmode == RelocInfo::RUNTIME_ENTRY);
+
+  mov(r0, Operand(target, rmode));
+  mtctr(r0);
+  bctr();
+
+  bind(&skip);
+  //  mov(pc, Operand(target, rmode), LeaveCC, cond);
+}
+
+
+void MacroAssembler::Jump(Address target, RelocInfo::Mode rmode, Condition cond,
+                          CRegister cr) {
+  DCHECK(!RelocInfo::IsCodeTarget(rmode));
+  Jump(reinterpret_cast<intptr_t>(target), rmode, cond, cr);
+}
+
+
+void MacroAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode,
+                          Condition cond) {
+  DCHECK(RelocInfo::IsCodeTarget(rmode));
+  // 'code' is always generated ppc code, never THUMB code
+  AllowDeferredHandleDereference embedding_raw_address;
+  Jump(reinterpret_cast<intptr_t>(code.location()), rmode, cond);
+}
+
+
+int MacroAssembler::CallSize(Register target, Condition cond) {
+  return 2 * kInstrSize;
+}
+
+
+void MacroAssembler::Call(Register target, Condition cond) {
+  BlockTrampolinePoolScope block_trampoline_pool(this);
+  Label start;
+  bind(&start);
+  DCHECK(cond == al);  // in prep of removal of condition
+
+  // Statement positions are expected to be recorded when the target
+  // address is loaded.
+  positions_recorder()->WriteRecordedPositions();
+
+  // branch via link register and set LK bit for return point
+  mtlr(target);
+  bclr(BA, SetLK);
+
+  DCHECK_EQ(CallSize(target, cond), SizeOfCodeGeneratedSince(&start));
+}
+
+
+int MacroAssembler::CallSize(Address target, RelocInfo::Mode rmode,
+                             Condition cond) {
+  Operand mov_operand = Operand(reinterpret_cast<intptr_t>(target), rmode);
+  return (2 + instructions_required_for_mov(mov_operand)) * kInstrSize;
+}
+
+
+int MacroAssembler::CallSizeNotPredictableCodeSize(Address target,
+                                                   RelocInfo::Mode rmode,
+                                                   Condition cond) {
+  return (2 + kMovInstructionsNoConstantPool) * kInstrSize;
+}
+
+
+void MacroAssembler::Call(Address target, RelocInfo::Mode rmode,
+                          Condition cond) {
+  BlockTrampolinePoolScope block_trampoline_pool(this);
+  DCHECK(cond == al);
+
+#ifdef DEBUG
+  // Check the expected size before generating code to ensure we assume the same
+  // constant pool availability (e.g., whether constant pool is full or not).
+  int expected_size = CallSize(target, rmode, cond);
+  Label start;
+  bind(&start);
+#endif
+
+  // Statement positions are expected to be recorded when the target
+  // address is loaded.
+  positions_recorder()->WriteRecordedPositions();
+
+  // This can likely be optimized to make use of bc() with 24bit relative
+  //
+  // RecordRelocInfo(x.rmode_, x.imm_);
+  // bc( BA, .... offset, LKset);
+  //
+
+  mov(ip, Operand(reinterpret_cast<intptr_t>(target), rmode));
+  mtlr(ip);
+  bclr(BA, SetLK);
+
+  DCHECK_EQ(expected_size, SizeOfCodeGeneratedSince(&start));
+}
+
+
+int MacroAssembler::CallSize(Handle<Code> code, RelocInfo::Mode rmode,
+                             TypeFeedbackId ast_id, Condition cond) {
+  AllowDeferredHandleDereference using_raw_address;
+  return CallSize(reinterpret_cast<Address>(code.location()), rmode, cond);
+}
+
+
+void MacroAssembler::Call(Handle<Code> code, RelocInfo::Mode rmode,
+                          TypeFeedbackId ast_id, Condition cond) {
+  BlockTrampolinePoolScope block_trampoline_pool(this);
+  DCHECK(RelocInfo::IsCodeTarget(rmode));
+
+#ifdef DEBUG
+  // Check the expected size before generating code to ensure we assume the same
+  // constant pool availability (e.g., whether constant pool is full or not).
+  int expected_size = CallSize(code, rmode, ast_id, cond);
+  Label start;
+  bind(&start);
+#endif
+
+  if (rmode == RelocInfo::CODE_TARGET && !ast_id.IsNone()) {
+    SetRecordedAstId(ast_id);
+    rmode = RelocInfo::CODE_TARGET_WITH_ID;
+  }
+  AllowDeferredHandleDereference using_raw_address;
+  Call(reinterpret_cast<Address>(code.location()), rmode, cond);
+  DCHECK_EQ(expected_size, SizeOfCodeGeneratedSince(&start));
+}
+
+
+void MacroAssembler::Ret(Condition cond) {
+  DCHECK(cond == al);
+  blr();
+}
+
+
+void MacroAssembler::Drop(int count, Condition cond) {
+  DCHECK(cond == al);
+  if (count > 0) {
+    Add(sp, sp, count * kPointerSize, r0);
+  }
+}
+
+
+void MacroAssembler::Ret(int drop, Condition cond) {
+  Drop(drop, cond);
+  Ret(cond);
+}
+
+
+void MacroAssembler::Call(Label* target) { b(target, SetLK); }
+
+
+void MacroAssembler::Push(Handle<Object> handle) {
+  mov(ip, Operand(handle));
+  push(ip);
+}
+
+
+void MacroAssembler::Move(Register dst, Handle<Object> value) {
+  AllowDeferredHandleDereference smi_check;
+  if (value->IsSmi()) {
+    LoadSmiLiteral(dst, reinterpret_cast<Smi*>(*value));
+  } else {
+    DCHECK(value->IsHeapObject());
+    if (isolate()->heap()->InNewSpace(*value)) {
+      Handle<Cell> cell = isolate()->factory()->NewCell(value);
+      mov(dst, Operand(cell));
+      LoadP(dst, FieldMemOperand(dst, Cell::kValueOffset));
+    } else {
+      mov(dst, Operand(value));
+    }
+  }
+}
+
+
+void MacroAssembler::Move(Register dst, Register src, Condition cond) {
+  DCHECK(cond == al);
+  if (!dst.is(src)) {
+    mr(dst, src);
+  }
+}
+
+
+void MacroAssembler::Move(DoubleRegister dst, DoubleRegister src) {
+  if (!dst.is(src)) {
+    fmr(dst, src);
+  }
+}
+
+
+void MacroAssembler::MultiPush(RegList regs) {
+  int16_t num_to_push = NumberOfBitsSet(regs);
+  int16_t stack_offset = num_to_push * kPointerSize;
+
+  subi(sp, sp, Operand(stack_offset));
+  for (int16_t i = kNumRegisters - 1; i >= 0; i--) {
+    if ((regs & (1 << i)) != 0) {
+      stack_offset -= kPointerSize;
+      StoreP(ToRegister(i), MemOperand(sp, stack_offset));
+    }
+  }
+}
+
+
+void MacroAssembler::MultiPop(RegList regs) {
+  int16_t stack_offset = 0;
+
+  for (int16_t i = 0; i < kNumRegisters; i++) {
+    if ((regs & (1 << i)) != 0) {
+      LoadP(ToRegister(i), MemOperand(sp, stack_offset));
+      stack_offset += kPointerSize;
+    }
+  }
+  addi(sp, sp, Operand(stack_offset));
+}
+
+
+void MacroAssembler::LoadRoot(Register destination, Heap::RootListIndex index,
+                              Condition cond) {
+  DCHECK(cond == al);
+  LoadP(destination, MemOperand(kRootRegister, index << kPointerSizeLog2), r0);
+}
+
+
+void MacroAssembler::StoreRoot(Register source, Heap::RootListIndex index,
+                               Condition cond) {
+  DCHECK(cond == al);
+  StoreP(source, MemOperand(kRootRegister, index << kPointerSizeLog2), r0);
+}
+
+
+void MacroAssembler::InNewSpace(Register object, Register scratch,
+                                Condition cond, Label* branch) {
+  // N.B. scratch may be same register as object
+  DCHECK(cond == eq || cond == ne);
+  mov(r0, Operand(ExternalReference::new_space_mask(isolate())));
+  and_(scratch, object, r0);
+  mov(r0, Operand(ExternalReference::new_space_start(isolate())));
+  cmp(scratch, r0);
+  b(cond, branch);
+}
+
+
+void MacroAssembler::RecordWriteField(
+    Register object, int offset, Register value, Register dst,
+    LinkRegisterStatus lr_status, SaveFPRegsMode save_fp,
+    RememberedSetAction remembered_set_action, SmiCheck smi_check,
+    PointersToHereCheck pointers_to_here_check_for_value) {
+  // First, check if a write barrier is even needed. The tests below
+  // catch stores of Smis.
+  Label done;
+
+  // Skip 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 so offset must be a multiple of kPointerSize.
+  DCHECK(IsAligned(offset, kPointerSize));
+
+  Add(dst, object, offset - kHeapObjectTag, r0);
+  if (emit_debug_code()) {
+    Label ok;
+    andi(r0, dst, Operand((1 << kPointerSizeLog2) - 1));
+    beq(&ok, cr0);
+    stop("Unaligned cell in write barrier");
+    bind(&ok);
+  }
+
+  RecordWrite(object, dst, value, lr_status, save_fp, remembered_set_action,
+              OMIT_SMI_CHECK, pointers_to_here_check_for_value);
+
+  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<intptr_t>(kZapValue + 4)));
+    mov(dst, Operand(BitCast<intptr_t>(kZapValue + 8)));
+  }
+}
+
+
+// Will clobber 4 registers: object, map, dst, ip.  The
+// register 'object' contains a heap object pointer.
+void MacroAssembler::RecordWriteForMap(Register object, Register map,
+                                       Register dst,
+                                       LinkRegisterStatus lr_status,
+                                       SaveFPRegsMode fp_mode) {
+  if (emit_debug_code()) {
+    LoadP(dst, FieldMemOperand(map, HeapObject::kMapOffset));
+    Cmpi(dst, Operand(isolate()->factory()->meta_map()), r0);
+    Check(eq, kWrongAddressOrValuePassedToRecordWrite);
+  }
+
+  if (!FLAG_incremental_marking) {
+    return;
+  }
+
+  if (emit_debug_code()) {
+    LoadP(ip, FieldMemOperand(object, HeapObject::kMapOffset));
+    cmp(ip, map);
+    Check(eq, kWrongAddressOrValuePassedToRecordWrite);
+  }
+
+  Label done;
+
+  // A single check of the map's pages interesting flag suffices, since it is
+  // only set during incremental collection, and then it's also guaranteed that
+  // the from object's page's interesting flag is also set.  This optimization
+  // relies on the fact that maps can never be in new space.
+  CheckPageFlag(map,
+                map,  // Used as scratch.
+                MemoryChunk::kPointersToHereAreInterestingMask, eq, &done);
+
+  addi(dst, object, Operand(HeapObject::kMapOffset - kHeapObjectTag));
+  if (emit_debug_code()) {
+    Label ok;
+    andi(r0, dst, Operand((1 << kPointerSizeLog2) - 1));
+    beq(&ok, cr0);
+    stop("Unaligned cell in write barrier");
+    bind(&ok);
+  }
+
+  // Record the actual write.
+  if (lr_status == kLRHasNotBeenSaved) {
+    mflr(r0);
+    push(r0);
+  }
+  RecordWriteStub stub(isolate(), object, map, dst, OMIT_REMEMBERED_SET,
+                       fp_mode);
+  CallStub(&stub);
+  if (lr_status == kLRHasNotBeenSaved) {
+    pop(r0);
+    mtlr(r0);
+  }
+
+  bind(&done);
+
+  // Count number of write barriers in generated code.
+  isolate()->counters()->write_barriers_static()->Increment();
+  IncrementCounter(isolate()->counters()->write_barriers_dynamic(), 1, ip, dst);
+
+  // Clobber clobbered registers when running with the debug-code flag
+  // turned on to provoke errors.
+  if (emit_debug_code()) {
+    mov(dst, Operand(BitCast<intptr_t>(kZapValue + 12)));
+    mov(map, Operand(BitCast<intptr_t>(kZapValue + 16)));
+  }
+}
+
+
+// Will clobber 4 registers: object, address, scratch, ip.  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,
+    PointersToHereCheck pointers_to_here_check_for_value) {
+  DCHECK(!object.is(value));
+  if (emit_debug_code()) {
+    LoadP(ip, MemOperand(address));
+    cmp(ip, value);
+    Check(eq, kWrongAddressOrValuePassedToRecordWrite);
+  }
+
+  if (remembered_set_action == OMIT_REMEMBERED_SET &&
+      !FLAG_incremental_marking) {
+    return;
+  }
+
+  // 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) {
+    JumpIfSmi(value, &done);
+  }
+
+  if (pointers_to_here_check_for_value != kPointersToHereAreAlwaysInteresting) {
+    CheckPageFlag(value,
+                  value,  // Used as scratch.
+                  MemoryChunk::kPointersToHereAreInterestingMask, eq, &done);
+  }
+  CheckPageFlag(object,
+                value,  // Used as scratch.
+                MemoryChunk::kPointersFromHereAreInterestingMask, eq, &done);
+
+  // Record the actual write.
+  if (lr_status == kLRHasNotBeenSaved) {
+    mflr(r0);
+    push(r0);
+  }
+  RecordWriteStub stub(isolate(), object, value, address, remembered_set_action,
+                       fp_mode);
+  CallStub(&stub);
+  if (lr_status == kLRHasNotBeenSaved) {
+    pop(r0);
+    mtlr(r0);
+  }
+
+  bind(&done);
+
+  // Count number of write barriers in generated code.
+  isolate()->counters()->write_barriers_static()->Increment();
+  IncrementCounter(isolate()->counters()->write_barriers_dynamic(), 1, ip,
+                   value);
+
+  // Clobber clobbered registers when running with the debug-code flag
+  // turned on to provoke errors.
+  if (emit_debug_code()) {
+    mov(address, Operand(BitCast<intptr_t>(kZapValue + 12)));
+    mov(value, Operand(BitCast<intptr_t>(kZapValue + 16)));
+  }
+}
+
+
+void MacroAssembler::RememberedSetHelper(Register object,  // For debug tests.
+                                         Register address, Register scratch,
+                                         SaveFPRegsMode fp_mode,
+                                         RememberedSetFinalAction and_then) {
+  Label done;
+  if (emit_debug_code()) {
+    Label ok;
+    JumpIfNotInNewSpace(object, scratch, &ok);
+    stop("Remembered set pointer is in new space");
+    bind(&ok);
+  }
+  // Load store buffer top.
+  ExternalReference store_buffer =
+      ExternalReference::store_buffer_top(isolate());
+  mov(ip, Operand(store_buffer));
+  LoadP(scratch, MemOperand(ip));
+  // Store pointer to buffer and increment buffer top.
+  StoreP(address, MemOperand(scratch));
+  addi(scratch, scratch, Operand(kPointerSize));
+  // Write back new top of buffer.
+  StoreP(scratch, MemOperand(ip));
+  // Call stub on end of buffer.
+  // Check for end of buffer.
+  mov(r0, Operand(StoreBuffer::kStoreBufferOverflowBit));
+  and_(r0, scratch, r0, SetRC);
+
+  if (and_then == kFallThroughAtEnd) {
+    beq(&done, cr0);
+  } else {
+    DCHECK(and_then == kReturnAtEnd);
+    beq(&done, cr0);
+  }
+  mflr(r0);
+  push(r0);
+  StoreBufferOverflowStub store_buffer_overflow =
+      StoreBufferOverflowStub(isolate(), fp_mode);
+  CallStub(&store_buffer_overflow);
+  pop(r0);
+  mtlr(r0);
+  bind(&done);
+  if (and_then == kReturnAtEnd) {
+    Ret();
+  }
+}
+
+
+void MacroAssembler::PushFixedFrame(Register marker_reg) {
+  mflr(r0);
+#if V8_OOL_CONSTANT_POOL
+  if (marker_reg.is_valid()) {
+    Push(r0, fp, kConstantPoolRegister, cp, marker_reg);
+  } else {
+    Push(r0, fp, kConstantPoolRegister, cp);
+  }
+#else
+  if (marker_reg.is_valid()) {
+    Push(r0, fp, cp, marker_reg);
+  } else {
+    Push(r0, fp, cp);
+  }
+#endif
+}
+
+
+void MacroAssembler::PopFixedFrame(Register marker_reg) {
+#if V8_OOL_CONSTANT_POOL
+  if (marker_reg.is_valid()) {
+    Pop(r0, fp, kConstantPoolRegister, cp, marker_reg);
+  } else {
+    Pop(r0, fp, kConstantPoolRegister, cp);
+  }
+#else
+  if (marker_reg.is_valid()) {
+    Pop(r0, fp, cp, marker_reg);
+  } else {
+    Pop(r0, fp, cp);
+  }
+#endif
+  mtlr(r0);
+}
+
+
+// Push and pop all registers that can hold pointers.
+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;
+  DCHECK(num_unsaved >= 0);
+  if (num_unsaved > 0) {
+    subi(sp, sp, Operand(num_unsaved * kPointerSize));
+  }
+  MultiPush(kSafepointSavedRegisters);
+}
+
+
+void MacroAssembler::PopSafepointRegisters() {
+  const int num_unsaved = kNumSafepointRegisters - kNumSafepointSavedRegisters;
+  MultiPop(kSafepointSavedRegisters);
+  if (num_unsaved > 0) {
+    addi(sp, sp, Operand(num_unsaved * kPointerSize));
+  }
+}
+
+
+void MacroAssembler::StoreToSafepointRegisterSlot(Register src, Register dst) {
+  StoreP(src, SafepointRegisterSlot(dst));
+}
+
+
+void MacroAssembler::LoadFromSafepointRegisterSlot(Register dst, Register src) {
+  LoadP(dst, SafepointRegisterSlot(src));
+}
+
+
+int MacroAssembler::SafepointRegisterStackIndex(int reg_code) {
+  // The registers are pushed starting with the highest encoding,
+  // which means that lowest encodings are closest to the stack pointer.
+  RegList regs = kSafepointSavedRegisters;
+  int index = 0;
+
+  DCHECK(reg_code >= 0 && reg_code < kNumRegisters);
+
+  for (int16_t i = 0; i < reg_code; i++) {
+    if ((regs & (1 << i)) != 0) {
+      index++;
+    }
+  }
+
+  return index;
+}
+
+
+MemOperand MacroAssembler::SafepointRegisterSlot(Register reg) {
+  return MemOperand(sp, SafepointRegisterStackIndex(reg.code()) * kPointerSize);
+}
+
+
+MemOperand MacroAssembler::SafepointRegistersAndDoublesSlot(Register reg) {
+  // General purpose registers are pushed last on the stack.
+  int doubles_size = DoubleRegister::NumAllocatableRegisters() * kDoubleSize;
+  int register_offset = SafepointRegisterStackIndex(reg.code()) * kPointerSize;
+  return MemOperand(sp, doubles_size + register_offset);
+}
+
+
+void MacroAssembler::CanonicalizeNaN(const DoubleRegister dst,
+                                     const DoubleRegister src) {
+  Label done;
+
+  // Test for NaN
+  fcmpu(src, src);
+
+  if (dst.is(src)) {
+    bordered(&done);
+  } else {
+    Label is_nan;
+    bunordered(&is_nan);
+    fmr(dst, src);
+    b(&done);
+    bind(&is_nan);
+  }
+
+  // Replace with canonical NaN.
+  double nan_value = FixedDoubleArray::canonical_not_the_hole_nan_as_double();
+  LoadDoubleLiteral(dst, nan_value, r0);
+
+  bind(&done);
+}
+
+
+void MacroAssembler::ConvertIntToDouble(Register src,
+                                        DoubleRegister double_dst) {
+  MovIntToDouble(double_dst, src, r0);
+  fcfid(double_dst, double_dst);
+}
+
+
+void MacroAssembler::ConvertUnsignedIntToDouble(Register src,
+                                                DoubleRegister double_dst) {
+  MovUnsignedIntToDouble(double_dst, src, r0);
+  fcfid(double_dst, double_dst);
+}
+
+
+void MacroAssembler::ConvertIntToFloat(const DoubleRegister dst,
+                                       const Register src,
+                                       const Register int_scratch) {
+  MovIntToDouble(dst, src, int_scratch);
+  fcfid(dst, dst);
+  frsp(dst, dst);
+}
+
+
+void MacroAssembler::ConvertDoubleToInt64(const DoubleRegister double_input,
+#if !V8_TARGET_ARCH_PPC64
+                                          const Register dst_hi,
+#endif
+                                          const Register dst,
+                                          const DoubleRegister double_dst,
+                                          FPRoundingMode rounding_mode) {
+  if (rounding_mode == kRoundToZero) {
+    fctidz(double_dst, double_input);
+  } else {
+    SetRoundingMode(rounding_mode);
+    fctid(double_dst, double_input);
+    ResetRoundingMode();
+  }
+
+  MovDoubleToInt64(
+#if !V8_TARGET_ARCH_PPC64
+      dst_hi,
+#endif
+      dst, double_dst);
+}
+
+
+#if V8_OOL_CONSTANT_POOL
+void MacroAssembler::LoadConstantPoolPointerRegister() {
+  ConstantPoolUnavailableScope constant_pool_unavailable(this);
+
+  // CheckBuffer() is called too frequently. This will pre-grow
+  // the buffer if needed to avoid spliting the relocation and instructions
+  EnsureSpaceFor(kMovInstructionsNoConstantPool * kInstrSize);
+
+  uintptr_t code_start = reinterpret_cast<uintptr_t>(pc_) - pc_offset();
+  int constant_pool_offset = Code::kConstantPoolOffset - Code::kHeaderSize;
+  mov(kConstantPoolRegister,
+      Operand(code_start, RelocInfo::INTERNAL_REFERENCE));
+  LoadP(kConstantPoolRegister,
+        MemOperand(kConstantPoolRegister, constant_pool_offset));
+}
+#endif
+
+
+void MacroAssembler::StubPrologue() {
+  PushFixedFrame();
+  Push(Smi::FromInt(StackFrame::STUB));
+  // Adjust FP to point to saved FP.
+  addi(fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp));
+#if V8_OOL_CONSTANT_POOL
+  LoadConstantPoolPointerRegister();
+  set_constant_pool_available(true);
+#endif
+}
+
+
+void MacroAssembler::Prologue(bool code_pre_aging) {
+  {
+    PredictableCodeSizeScope predictible_code_size_scope(
+        this, kNoCodeAgeSequenceLength);
+    Assembler::BlockTrampolinePoolScope block_trampoline_pool(this);
+    // The following instructions must remain together and unmodified
+    // for code aging to work properly.
+    if (code_pre_aging) {
+      // Pre-age the code.
+      // This matches the code found in PatchPlatformCodeAge()
+      Code* stub = Code::GetPreAgedCodeAgeStub(isolate());
+      intptr_t target = reinterpret_cast<intptr_t>(stub->instruction_start());
+      mflr(ip);
+      mov(r3, Operand(target));
+      Call(r3);
+      for (int i = 0; i < kCodeAgingSequenceNops; i++) {
+        nop();
+      }
+    } else {
+      // This matches the code found in GetNoCodeAgeSequence()
+      PushFixedFrame(r4);
+      // Adjust fp to point to saved fp.
+      addi(fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp));
+      for (int i = 0; i < kNoCodeAgeSequenceNops; i++) {
+        nop();
+      }
+    }
+  }
+#if V8_OOL_CONSTANT_POOL
+  LoadConstantPoolPointerRegister();
+  set_constant_pool_available(true);
+#endif
+}
+
+
+void MacroAssembler::EnterFrame(StackFrame::Type type,
+                                bool load_constant_pool) {
+  PushFixedFrame();
+#if V8_OOL_CONSTANT_POOL
+  if (load_constant_pool) {
+    LoadConstantPoolPointerRegister();
+  }
+#endif
+  LoadSmiLiteral(r0, Smi::FromInt(type));
+  push(r0);
+  mov(r0, Operand(CodeObject()));
+  push(r0);
+  // Adjust FP to point to saved FP.
+  addi(fp, sp,
+       Operand(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize));
+}
+
+
+int MacroAssembler::LeaveFrame(StackFrame::Type type) {
+  // r3: preserved
+  // r4: preserved
+  // r5: preserved
+
+  // Drop the execution stack down to the frame pointer and restore
+  // the caller frame pointer, return address and constant pool pointer.
+  int frame_ends;
+#if V8_OOL_CONSTANT_POOL
+  addi(sp, fp, Operand(StandardFrameConstants::kConstantPoolOffset));
+  frame_ends = pc_offset();
+  Pop(r0, fp, kConstantPoolRegister);
+#else
+  mr(sp, fp);
+  frame_ends = pc_offset();
+  Pop(r0, fp);
+#endif
+  mtlr(r0);
+  return frame_ends;
+}
+
+
+// ExitFrame layout (probably wrongish.. needs updating)
+//
+//  SP -> previousSP
+//        LK reserved
+//        code
+//        sp_on_exit (for debug?)
+// oldSP->prev SP
+//        LK
+//        <parameters on stack>
+
+// Prior to calling EnterExitFrame, we've got a bunch of parameters
+// on the stack that we need to wrap a real frame around.. so first
+// we reserve a slot for LK and push the previous SP which is captured
+// in the fp register (r31)
+// Then - we buy a new frame
+
+void MacroAssembler::EnterExitFrame(bool save_doubles, int stack_space) {
+  // Set up the frame structure on the stack.
+  DCHECK_EQ(2 * kPointerSize, ExitFrameConstants::kCallerSPDisplacement);
+  DCHECK_EQ(1 * kPointerSize, ExitFrameConstants::kCallerPCOffset);
+  DCHECK_EQ(0 * kPointerSize, ExitFrameConstants::kCallerFPOffset);
+  DCHECK(stack_space > 0);
+
+  // This is an opportunity to build a frame to wrap
+  // all of the pushes that have happened inside of V8
+  // since we were called from C code
+
+  // replicate ARM frame - TODO make this more closely follow PPC ABI
+  mflr(r0);
+  Push(r0, fp);
+  mr(fp, sp);
+  // Reserve room for saved entry sp and code object.
+  subi(sp, sp, Operand(ExitFrameConstants::kFrameSize));
+
+  if (emit_debug_code()) {
+    li(r8, Operand::Zero());
+    StoreP(r8, MemOperand(fp, ExitFrameConstants::kSPOffset));
+  }
+#if V8_OOL_CONSTANT_POOL
+  StoreP(kConstantPoolRegister,
+         MemOperand(fp, ExitFrameConstants::kConstantPoolOffset));
+#endif
+  mov(r8, Operand(CodeObject()));
+  StoreP(r8, MemOperand(fp, ExitFrameConstants::kCodeOffset));
+
+  // Save the frame pointer and the context in top.
+  mov(r8, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
+  StoreP(fp, MemOperand(r8));
+  mov(r8, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
+  StoreP(cp, MemOperand(r8));
+
+  // Optionally save all volatile double registers.
+  if (save_doubles) {
+    SaveFPRegs(sp, 0, DoubleRegister::kNumVolatileRegisters);
+    // Note that d0 will be accessible at
+    //   fp - ExitFrameConstants::kFrameSize -
+    //   kNumVolatileRegisters * kDoubleSize,
+    // since the sp slot and code slot were pushed after the fp.
+  }
+
+  addi(sp, sp, Operand(-stack_space * kPointerSize));
+
+  // Allocate and align the frame preparing for calling the runtime
+  // function.
+  const int frame_alignment = ActivationFrameAlignment();
+  if (frame_alignment > kPointerSize) {
+    DCHECK(IsPowerOf2(frame_alignment));
+    ClearRightImm(sp, sp, Operand(WhichPowerOf2(frame_alignment)));
+  }
+  li(r0, Operand::Zero());
+  StorePU(r0, MemOperand(sp, -kNumRequiredStackFrameSlots * kPointerSize));
+
+  // Set the exit frame sp value to point just before the return address
+  // location.
+  addi(r8, sp, Operand((kStackFrameExtraParamSlot + 1) * kPointerSize));
+  StoreP(r8, MemOperand(fp, ExitFrameConstants::kSPOffset));
+}
+
+
+void MacroAssembler::InitializeNewString(Register string, Register length,
+                                         Heap::RootListIndex map_index,
+                                         Register scratch1, Register scratch2) {
+  SmiTag(scratch1, length);
+  LoadRoot(scratch2, map_index);
+  StoreP(scratch1, FieldMemOperand(string, String::kLengthOffset), r0);
+  li(scratch1, Operand(String::kEmptyHashField));
+  StoreP(scratch2, FieldMemOperand(string, HeapObject::kMapOffset), r0);
+  StoreP(scratch1, FieldMemOperand(string, String::kHashFieldSlot), r0);
+}
+
+
+int MacroAssembler::ActivationFrameAlignment() {
+#if !defined(USE_SIMULATOR)
+  // 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 PPC
+  // platform for another PPC platform with a different alignment.
+  return base::OS::ActivationFrameAlignment();
+#else  // Simulated
+  // 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
+}
+
+
+void MacroAssembler::LeaveExitFrame(bool save_doubles, Register argument_count,
+                                    bool restore_context) {
+#if V8_OOL_CONSTANT_POOL
+  ConstantPoolUnavailableScope constant_pool_unavailable(this);
+#endif
+  // Optionally restore all double registers.
+  if (save_doubles) {
+    // Calculate the stack location of the saved doubles and restore them.
+    const int kNumRegs = DoubleRegister::kNumVolatileRegisters;
+    const int offset =
+        (ExitFrameConstants::kFrameSize + kNumRegs * kDoubleSize);
+    addi(r6, fp, Operand(-offset));
+    RestoreFPRegs(r6, 0, kNumRegs);
+  }
+
+  // Clear top frame.
+  li(r6, Operand::Zero());
+  mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
+  StoreP(r6, MemOperand(ip));
+
+  // Restore current context from top and clear it in debug mode.
+  if (restore_context) {
+    mov(ip, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
+    LoadP(cp, MemOperand(ip));
+  }
+#ifdef DEBUG
+  mov(ip, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
+  StoreP(r6, MemOperand(ip));
+#endif
+
+// Tear down the exit frame, pop the arguments, and return.
+#if V8_OOL_CONSTANT_POOL
+  LoadP(kConstantPoolRegister,
+        MemOperand(fp, ExitFrameConstants::kConstantPoolOffset));
+#endif
+  mr(sp, fp);
+  pop(fp);
+  pop(r0);
+  mtlr(r0);
+
+  if (argument_count.is_valid()) {
+    ShiftLeftImm(argument_count, argument_count, Operand(kPointerSizeLog2));
+    add(sp, sp, argument_count);
+  }
+}
+
+
+void MacroAssembler::MovFromFloatResult(const DoubleRegister dst) {
+  Move(dst, d1);
+}
+
+
+void MacroAssembler::MovFromFloatParameter(const DoubleRegister dst) {
+  Move(dst, d1);
+}
+
+
+void MacroAssembler::InvokePrologue(const ParameterCount& expected,
+                                    const ParameterCount& actual,
+                                    Handle<Code> code_constant,
+                                    Register code_reg, Label* done,
+                                    bool* definitely_mismatches,
+                                    InvokeFlag flag,
+                                    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:
+  //  r3: actual arguments count
+  //  r4: function (passed through to callee)
+  //  r5: 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.
+
+  // roohack - remove these 3 checks temporarily
+  //  DCHECK(actual.is_immediate() || actual.reg().is(r3));
+  //  DCHECK(expected.is_immediate() || expected.reg().is(r5));
+  //  DCHECK((!code_constant.is_null() && code_reg.is(no_reg))
+  //          || code_reg.is(r6));
+
+  if (expected.is_immediate()) {
+    DCHECK(actual.is_immediate());
+    if (expected.immediate() == actual.immediate()) {
+      definitely_matches = true;
+    } else {
+      mov(r3, Operand(actual.immediate()));
+      const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel;
+      if (expected.immediate() == sentinel) {
+        // 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;
+        mov(r5, Operand(expected.immediate()));
+      }
+    }
+  } else {
+    if (actual.is_immediate()) {
+      cmpi(expected.reg(), Operand(actual.immediate()));
+      beq(&regular_invoke);
+      mov(r3, Operand(actual.immediate()));
+    } else {
+      cmp(expected.reg(), actual.reg());
+      beq(&regular_invoke);
+    }
+  }
+
+  if (!definitely_matches) {
+    if (!code_constant.is_null()) {
+      mov(r6, Operand(code_constant));
+      addi(r6, r6, Operand(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) {
+        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.
+  DCHECK(flag == JUMP_FUNCTION || has_frame());
+
+  Label done;
+  bool definitely_mismatches = false;
+  InvokePrologue(expected, actual, Handle<Code>::null(), code, &done,
+                 &definitely_mismatches, flag, call_wrapper);
+  if (!definitely_mismatches) {
+    if (flag == CALL_FUNCTION) {
+      call_wrapper.BeforeCall(CallSize(code));
+      Call(code);
+      call_wrapper.AfterCall();
+    } else {
+      DCHECK(flag == JUMP_FUNCTION);
+      Jump(code);
+    }
+
+    // Continue here if InvokePrologue does handle the invocation due to
+    // mismatched parameter counts.
+    bind(&done);
+  }
+}
+
+
+void MacroAssembler::InvokeFunction(Register fun, const ParameterCount& actual,
+                                    InvokeFlag flag,
+                                    const CallWrapper& call_wrapper) {
+  // You can't call a function without a valid frame.
+  DCHECK(flag == JUMP_FUNCTION || has_frame());
+
+  // Contract with called JS functions requires that function is passed in r4.
+  DCHECK(fun.is(r4));
+
+  Register expected_reg = r5;
+  Register code_reg = r6;
+
+  LoadP(code_reg, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
+  LoadP(cp, FieldMemOperand(r4, JSFunction::kContextOffset));
+  LoadWordArith(expected_reg,
+                FieldMemOperand(
+                    code_reg, SharedFunctionInfo::kFormalParameterCountOffset));
+#if !defined(V8_TARGET_ARCH_PPC64)
+  SmiUntag(expected_reg);
+#endif
+  LoadP(code_reg, FieldMemOperand(r4, 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.
+  DCHECK(flag == JUMP_FUNCTION || has_frame());
+
+  // Contract with called JS functions requires that function is passed in r4.
+  DCHECK(function.is(r4));
+
+  // Get the function and setup the context.
+  LoadP(cp, FieldMemOperand(r4, 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.
+  LoadP(r6, FieldMemOperand(r4, JSFunction::kCodeEntryOffset));
+  InvokeCode(r6, expected, actual, flag, call_wrapper);
+}
+
+
+void MacroAssembler::InvokeFunction(Handle<JSFunction> function,
+                                    const ParameterCount& expected,
+                                    const ParameterCount& actual,
+                                    InvokeFlag flag,
+                                    const CallWrapper& call_wrapper) {
+  Move(r4, function);
+  InvokeFunction(r4, expected, actual, flag, call_wrapper);
+}
+
+
+void MacroAssembler::IsObjectJSObjectType(Register heap_object, Register map,
+                                          Register scratch, Label* fail) {
+  LoadP(map, FieldMemOperand(heap_object, HeapObject::kMapOffset));
+  IsInstanceJSObjectType(map, scratch, fail);
+}
+
+
+void MacroAssembler::IsInstanceJSObjectType(Register map, Register scratch,
+                                            Label* fail) {
+  lbz(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset));
+  cmpi(scratch, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
+  blt(fail);
+  cmpi(scratch, Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE));
+  bgt(fail);
+}
+
+
+void MacroAssembler::IsObjectJSStringType(Register object, Register scratch,
+                                          Label* fail) {
+  DCHECK(kNotStringTag != 0);
+
+  LoadP(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
+  lbz(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
+  andi(r0, scratch, Operand(kIsNotStringMask));
+  bne(fail, cr0);
+}
+
+
+void MacroAssembler::IsObjectNameType(Register object, Register scratch,
+                                      Label* fail) {
+  LoadP(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
+  lbz(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
+  cmpi(scratch, Operand(LAST_NAME_TYPE));
+  bgt(fail);
+}
+
+
+void MacroAssembler::DebugBreak() {
+  li(r3, Operand::Zero());
+  mov(r4, Operand(ExternalReference(Runtime::kDebugBreak, isolate())));
+  CEntryStub ces(isolate(), 1);
+  DCHECK(AllowThisStubCall(&ces));
+  Call(ces.GetCode(), RelocInfo::DEBUG_BREAK);
+}
+
+
+void MacroAssembler::PushTryHandler(StackHandler::Kind kind,
+                                    int handler_index) {
+  // 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);
+
+  // For the JSEntry handler, we must preserve r1-r7, r0,r8-r15 are available.
+  // We want the stack to look like
+  // sp -> NextOffset
+  //       CodeObject
+  //       state
+  //       context
+  //       frame pointer
+
+  // Link the current handler as the next handler.
+  mov(r8, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
+  LoadP(r0, MemOperand(r8));
+  StorePU(r0, MemOperand(sp, -StackHandlerConstants::kSize));
+  // Set this new handler as the current one.
+  StoreP(sp, MemOperand(r8));
+
+  if (kind == StackHandler::JS_ENTRY) {
+    li(r8, Operand::Zero());  // NULL frame pointer.
+    StoreP(r8, MemOperand(sp, StackHandlerConstants::kFPOffset));
+    LoadSmiLiteral(r8, Smi::FromInt(0));  // Indicates no context.
+    StoreP(r8, MemOperand(sp, StackHandlerConstants::kContextOffset));
+  } else {
+    // still not sure if fp is right
+    StoreP(fp, MemOperand(sp, StackHandlerConstants::kFPOffset));
+    StoreP(cp, MemOperand(sp, StackHandlerConstants::kContextOffset));
+  }
+  unsigned state = StackHandler::IndexField::encode(handler_index) |
+                   StackHandler::KindField::encode(kind);
+  LoadIntLiteral(r8, state);
+  StoreP(r8, MemOperand(sp, StackHandlerConstants::kStateOffset));
+  mov(r8, Operand(CodeObject()));
+  StoreP(r8, MemOperand(sp, StackHandlerConstants::kCodeOffset));
+}
+
+
+void MacroAssembler::PopTryHandler() {
+  STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
+  pop(r4);
+  mov(ip, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
+  addi(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize));
+  StoreP(r4, MemOperand(ip));
+}
+
+
+// PPC - make use of ip as a temporary register
+void MacroAssembler::JumpToHandlerEntry() {
+// Compute the handler entry address and jump to it.  The handler table is
+// a fixed array of (smi-tagged) code offsets.
+// r3 = exception, r4 = code object, r5 = state.
+#if V8_OOL_CONSTANT_POOL
+  ConstantPoolUnavailableScope constant_pool_unavailable(this);
+  LoadP(kConstantPoolRegister, FieldMemOperand(r4, Code::kConstantPoolOffset));
+#endif
+  LoadP(r6, FieldMemOperand(r4, Code::kHandlerTableOffset));  // Handler table.
+  addi(r6, r6, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  srwi(r5, r5, Operand(StackHandler::kKindWidth));  // Handler index.
+  slwi(ip, r5, Operand(kPointerSizeLog2));
+  add(ip, r6, ip);
+  LoadP(r5, MemOperand(ip));  // Smi-tagged offset.
+  addi(r4, r4, Operand(Code::kHeaderSize - kHeapObjectTag));  // Code start.
+  SmiUntag(ip, r5);
+  add(r0, r4, ip);
+  mtctr(r0);
+  bctr();
+}
+
+
+void MacroAssembler::Throw(Register value) {
+  // 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);
+  Label skip;
+
+  // The exception is expected in r3.
+  if (!value.is(r3)) {
+    mr(r3, value);
+  }
+  // Drop the stack pointer to the top of the top handler.
+  mov(r6, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
+  LoadP(sp, MemOperand(r6));
+  // Restore the next handler.
+  pop(r5);
+  StoreP(r5, MemOperand(r6));
+
+  // Get the code object (r4) and state (r5).  Restore the context and frame
+  // pointer.
+  pop(r4);
+  pop(r5);
+  pop(cp);
+  pop(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.
+  cmpi(cp, Operand::Zero());
+  beq(&skip);
+  StoreP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+  bind(&skip);
+
+  JumpToHandlerEntry();
+}
+
+
+void MacroAssembler::ThrowUncatchable(Register value) {
+  // 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 exception is expected in r3.
+  if (!value.is(r3)) {
+    mr(r3, value);
+  }
+  // Drop the stack pointer to the top of the top stack handler.
+  mov(r6, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
+  LoadP(sp, MemOperand(r6));
+
+  // Unwind the handlers until the ENTRY handler is found.
+  Label fetch_next, check_kind;
+  b(&check_kind);
+  bind(&fetch_next);
+  LoadP(sp, MemOperand(sp, StackHandlerConstants::kNextOffset));
+
+  bind(&check_kind);
+  STATIC_ASSERT(StackHandler::JS_ENTRY == 0);
+  LoadP(r5, MemOperand(sp, StackHandlerConstants::kStateOffset));
+  andi(r0, r5, Operand(StackHandler::KindField::kMask));
+  bne(&fetch_next, cr0);
+
+  // Set the top handler address to next handler past the top ENTRY handler.
+  pop(r5);
+  StoreP(r5, MemOperand(r6));
+  // Get the code object (r4) and state (r5).  Clear the context and frame
+  // pointer (0 was saved in the handler).
+  pop(r4);
+  pop(r5);
+  pop(cp);
+  pop(fp);
+
+  JumpToHandlerEntry();
+}
+
+
+void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
+                                            Register scratch, Label* miss) {
+  Label same_contexts;
+
+  DCHECK(!holder_reg.is(scratch));
+  DCHECK(!holder_reg.is(ip));
+  DCHECK(!scratch.is(ip));
+
+  // Load current lexical context from the stack frame.
+  LoadP(scratch, MemOperand(fp, StandardFrameConstants::kContextOffset));
+// In debug mode, make sure the lexical context is set.
+#ifdef DEBUG
+  cmpi(scratch, Operand::Zero());
+  Check(ne, kWeShouldNotHaveAnEmptyLexicalContext);
+#endif
+
+  // Load the native context of the current context.
+  int offset =
+      Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
+  LoadP(scratch, FieldMemOperand(scratch, offset));
+  LoadP(scratch, FieldMemOperand(scratch, GlobalObject::kNativeContextOffset));
+
+  // Check the context is a native context.
+  if (emit_debug_code()) {
+    // Cannot use ip as a temporary in this verification code. Due to the fact
+    // that ip is clobbered as part of cmp with an object Operand.
+    push(holder_reg);  // Temporarily save holder on the stack.
+    // Read the first word and compare to the native_context_map.
+    LoadP(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset));
+    LoadRoot(ip, Heap::kNativeContextMapRootIndex);
+    cmp(holder_reg, ip);
+    Check(eq, kJSGlobalObjectNativeContextShouldBeANativeContext);
+    pop(holder_reg);  // Restore holder.
+  }
+
+  // Check if both contexts are the same.
+  LoadP(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kNativeContextOffset));
+  cmp(scratch, ip);
+  beq(&same_contexts);
+
+  // Check the context is a native context.
+  if (emit_debug_code()) {
+    // Cannot use ip as a temporary in this verification code. Due to the fact
+    // that ip is clobbered as part of cmp with an object Operand.
+    push(holder_reg);    // Temporarily save holder on the stack.
+    mr(holder_reg, ip);  // Move ip to its holding place.
+    LoadRoot(ip, Heap::kNullValueRootIndex);
+    cmp(holder_reg, ip);
+    Check(ne, kJSGlobalProxyContextShouldNotBeNull);
+
+    LoadP(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset));
+    LoadRoot(ip, Heap::kNativeContextMapRootIndex);
+    cmp(holder_reg, ip);
+    Check(eq, kJSGlobalObjectNativeContextShouldBeANativeContext);
+    // Restore ip is not needed. ip is reloaded below.
+    pop(holder_reg);  // Restore holder.
+    // Restore ip to holder's context.
+    LoadP(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kNativeContextOffset));
+  }
+
+  // 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;
+
+  LoadP(scratch, FieldMemOperand(scratch, token_offset));
+  LoadP(ip, FieldMemOperand(ip, token_offset));
+  cmp(scratch, ip);
+  bne(miss);
+
+  bind(&same_contexts);
+}
+
+
+// Compute the hash code from the untagged key.  This must be kept in sync with
+// ComputeIntegerHash in utils.h and KeyedLoadGenericStub in
+// code-stub-hydrogen.cc
+void MacroAssembler::GetNumberHash(Register t0, Register scratch) {
+  // First of all we assign the hash seed to scratch.
+  LoadRoot(scratch, Heap::kHashSeedRootIndex);
+  SmiUntag(scratch);
+
+  // Xor original key with a seed.
+  xor_(t0, t0, scratch);
+
+  // Compute the hash code from the untagged key.  This must be kept in sync
+  // with ComputeIntegerHash in utils.h.
+  //
+  // hash = ~hash + (hash << 15);
+  notx(scratch, t0);
+  slwi(t0, t0, Operand(15));
+  add(t0, scratch, t0);
+  // hash = hash ^ (hash >> 12);
+  srwi(scratch, t0, Operand(12));
+  xor_(t0, t0, scratch);
+  // hash = hash + (hash << 2);
+  slwi(scratch, t0, Operand(2));
+  add(t0, t0, scratch);
+  // hash = hash ^ (hash >> 4);
+  srwi(scratch, t0, Operand(4));
+  xor_(t0, t0, scratch);
+  // hash = hash * 2057;
+  mr(r0, t0);
+  slwi(scratch, t0, Operand(3));
+  add(t0, t0, scratch);
+  slwi(scratch, r0, Operand(11));
+  add(t0, t0, scratch);
+  // hash = hash ^ (hash >> 16);
+  srwi(scratch, t0, Operand(16));
+  xor_(t0, t0, scratch);
+}
+
+
+void MacroAssembler::LoadFromNumberDictionary(Label* miss, Register elements,
+                                              Register key, Register result,
+                                              Register t0, Register t1,
+                                              Register t2) {
+  // Register use:
+  //
+  // elements - holds the slow-case elements of the receiver on entry.
+  //            Unchanged unless 'result' is the same register.
+  //
+  // key      - holds the smi key on entry.
+  //            Unchanged unless 'result' is the same register.
+  //
+  // result   - holds the result on exit if the load succeeded.
+  //            Allowed to be the same as 'key' or 'result'.
+  //            Unchanged on bailout so 'key' or 'result' can be used
+  //            in further computation.
+  //
+  // Scratch registers:
+  //
+  // t0 - holds the untagged key on entry and holds the hash once computed.
+  //
+  // t1 - used to hold the capacity mask of the dictionary
+  //
+  // t2 - used for the index into the dictionary.
+  Label done;
+
+  GetNumberHash(t0, t1);
+
+  // Compute the capacity mask.
+  LoadP(t1, FieldMemOperand(elements, SeededNumberDictionary::kCapacityOffset));
+  SmiUntag(t1);
+  subi(t1, t1, Operand(1));
+
+  // Generate an unrolled loop that performs a few probes before giving up.
+  for (int i = 0; i < kNumberDictionaryProbes; i++) {
+    // Use t2 for index calculations and keep the hash intact in t0.
+    mr(t2, t0);
+    // Compute the masked index: (hash + i + i * i) & mask.
+    if (i > 0) {
+      addi(t2, t2, Operand(SeededNumberDictionary::GetProbeOffset(i)));
+    }
+    and_(t2, t2, t1);
+
+    // Scale the index by multiplying by the element size.
+    DCHECK(SeededNumberDictionary::kEntrySize == 3);
+    slwi(ip, t2, Operand(1));
+    add(t2, t2, ip);  // t2 = t2 * 3
+
+    // Check if the key is identical to the name.
+    slwi(t2, t2, Operand(kPointerSizeLog2));
+    add(t2, elements, t2);
+    LoadP(ip,
+          FieldMemOperand(t2, SeededNumberDictionary::kElementsStartOffset));
+    cmp(key, ip);
+    if (i != kNumberDictionaryProbes - 1) {
+      beq(&done);
+    } else {
+      bne(miss);
+    }
+  }
+
+  bind(&done);
+  // Check that the value is a normal property.
+  // t2: elements + (index * kPointerSize)
+  const int kDetailsOffset =
+      SeededNumberDictionary::kElementsStartOffset + 2 * kPointerSize;
+  LoadP(t1, FieldMemOperand(t2, kDetailsOffset));
+  LoadSmiLiteral(ip, Smi::FromInt(PropertyDetails::TypeField::kMask));
+  and_(r0, t1, ip, SetRC);
+  bne(miss, cr0);
+
+  // Get the value at the masked, scaled index and return.
+  const int kValueOffset =
+      SeededNumberDictionary::kElementsStartOffset + kPointerSize;
+  LoadP(result, FieldMemOperand(t2, kValueOffset));
+}
+
+
+void MacroAssembler::Allocate(int object_size, Register result,
+                              Register scratch1, Register scratch2,
+                              Label* gc_required, AllocationFlags flags) {
+  DCHECK(object_size <= Page::kMaxRegularHeapObjectSize);
+  if (!FLAG_inline_new) {
+    if (emit_debug_code()) {
+      // Trash the registers to simulate an allocation failure.
+      li(result, Operand(0x7091));
+      li(scratch1, Operand(0x7191));
+      li(scratch2, Operand(0x7291));
+    }
+    b(gc_required);
+    return;
+  }
+
+  DCHECK(!result.is(scratch1));
+  DCHECK(!result.is(scratch2));
+  DCHECK(!scratch1.is(scratch2));
+  DCHECK(!scratch1.is(ip));
+  DCHECK(!scratch2.is(ip));
+
+  // Make object size into bytes.
+  if ((flags & SIZE_IN_WORDS) != 0) {
+    object_size *= kPointerSize;
+  }
+  DCHECK_EQ(0, static_cast<int>(object_size & kObjectAlignmentMask));
+
+  // Check relative positions of allocation top and limit addresses.
+  ExternalReference allocation_top =
+      AllocationUtils::GetAllocationTopReference(isolate(), flags);
+  ExternalReference allocation_limit =
+      AllocationUtils::GetAllocationLimitReference(isolate(), flags);
+
+  intptr_t top = reinterpret_cast<intptr_t>(allocation_top.address());
+  intptr_t limit = reinterpret_cast<intptr_t>(allocation_limit.address());
+  DCHECK((limit - top) == kPointerSize);
+
+  // Set up allocation top address register.
+  Register topaddr = scratch1;
+  mov(topaddr, Operand(allocation_top));
+
+  // This code stores a temporary value in ip. This is OK, as the code below
+  // does not need ip for implicit literal generation.
+  if ((flags & RESULT_CONTAINS_TOP) == 0) {
+    // Load allocation top into result and allocation limit into ip.
+    LoadP(result, MemOperand(topaddr));
+    LoadP(ip, MemOperand(topaddr, kPointerSize));
+  } else {
+    if (emit_debug_code()) {
+      // Assert that result actually contains top on entry. ip is used
+      // immediately below so this use of ip does not cause difference with
+      // respect to register content between debug and release mode.
+      LoadP(ip, MemOperand(topaddr));
+      cmp(result, ip);
+      Check(eq, kUnexpectedAllocationTop);
+    }
+    // Load allocation limit into ip. Result already contains allocation top.
+    LoadP(ip, MemOperand(topaddr, limit - top), r0);
+  }
+
+  if ((flags & DOUBLE_ALIGNMENT) != 0) {
+    // Align the next allocation. Storing the filler map without checking top is
+    // safe in new-space because the limit of the heap is aligned there.
+    DCHECK((flags & PRETENURE_OLD_POINTER_SPACE) == 0);
+#if V8_TARGET_ARCH_PPC64
+    STATIC_ASSERT(kPointerAlignment == kDoubleAlignment);
+#else
+    STATIC_ASSERT(kPointerAlignment * 2 == kDoubleAlignment);
+    andi(scratch2, result, Operand(kDoubleAlignmentMask));
+    Label aligned;
+    beq(&aligned, cr0);
+    if ((flags & PRETENURE_OLD_DATA_SPACE) != 0) {
+      cmpl(result, ip);
+      bge(gc_required);
+    }
+    mov(scratch2, Operand(isolate()->factory()->one_pointer_filler_map()));
+    stw(scratch2, MemOperand(result));
+    addi(result, result, Operand(kDoubleSize / 2));
+    bind(&aligned);
+#endif
+  }
+
+  // Calculate new top and bail out if new space is exhausted. Use result
+  // to calculate the new top.
+  li(r0, Operand(-1));
+  if (is_int16(object_size)) {
+    addic(scratch2, result, Operand(object_size));
+  } else {
+    mov(scratch2, Operand(object_size));
+    addc(scratch2, result, scratch2);
+  }
+  addze(r0, r0, LeaveOE, SetRC);
+  beq(gc_required, cr0);
+  cmpl(scratch2, ip);
+  bgt(gc_required);
+  StoreP(scratch2, MemOperand(topaddr));
+
+  // Tag object if requested.
+  if ((flags & TAG_OBJECT) != 0) {
+    addi(result, result, Operand(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.
+      li(result, Operand(0x7091));
+      li(scratch1, Operand(0x7191));
+      li(scratch2, Operand(0x7291));
+    }
+    b(gc_required);
+    return;
+  }
+
+  // Assert that the register arguments are different and that none of
+  // them are ip. ip is used explicitly in the code generated below.
+  DCHECK(!result.is(scratch1));
+  DCHECK(!result.is(scratch2));
+  DCHECK(!scratch1.is(scratch2));
+  DCHECK(!object_size.is(ip));
+  DCHECK(!result.is(ip));
+  DCHECK(!scratch1.is(ip));
+  DCHECK(!scratch2.is(ip));
+
+  // Check relative positions of allocation top and limit addresses.
+  ExternalReference allocation_top =
+      AllocationUtils::GetAllocationTopReference(isolate(), flags);
+  ExternalReference allocation_limit =
+      AllocationUtils::GetAllocationLimitReference(isolate(), flags);
+  intptr_t top = reinterpret_cast<intptr_t>(allocation_top.address());
+  intptr_t limit = reinterpret_cast<intptr_t>(allocation_limit.address());
+  DCHECK((limit - top) == kPointerSize);
+
+  // Set up allocation top address.
+  Register topaddr = scratch1;
+  mov(topaddr, Operand(allocation_top));
+
+  // This code stores a temporary value in ip. This is OK, as the code below
+  // does not need ip for implicit literal generation.
+  if ((flags & RESULT_CONTAINS_TOP) == 0) {
+    // Load allocation top into result and allocation limit into ip.
+    LoadP(result, MemOperand(topaddr));
+    LoadP(ip, MemOperand(topaddr, kPointerSize));
+  } else {
+    if (emit_debug_code()) {
+      // Assert that result actually contains top on entry. ip is used
+      // immediately below so this use of ip does not cause difference with
+      // respect to register content between debug and release mode.
+      LoadP(ip, MemOperand(topaddr));
+      cmp(result, ip);
+      Check(eq, kUnexpectedAllocationTop);
+    }
+    // Load allocation limit into ip. Result already contains allocation top.
+    LoadP(ip, MemOperand(topaddr, limit - top));
+  }
+
+  if ((flags & DOUBLE_ALIGNMENT) != 0) {
+    // Align the next allocation. Storing the filler map without checking top is
+    // safe in new-space because the limit of the heap is aligned there.
+    DCHECK((flags & PRETENURE_OLD_POINTER_SPACE) == 0);
+#if V8_TARGET_ARCH_PPC64
+    STATIC_ASSERT(kPointerAlignment == kDoubleAlignment);
+#else
+    STATIC_ASSERT(kPointerAlignment * 2 == kDoubleAlignment);
+    andi(scratch2, result, Operand(kDoubleAlignmentMask));
+    Label aligned;
+    beq(&aligned, cr0);
+    if ((flags & PRETENURE_OLD_DATA_SPACE) != 0) {
+      cmpl(result, ip);
+      bge(gc_required);
+    }
+    mov(scratch2, Operand(isolate()->factory()->one_pointer_filler_map()));
+    stw(scratch2, MemOperand(result));
+    addi(result, result, Operand(kDoubleSize / 2));
+    bind(&aligned);
+#endif
+  }
+
+  // Calculate new top and bail out if new space is exhausted. Use result
+  // to calculate the new top. Object size may be in words so a shift is
+  // required to get the number of bytes.
+  li(r0, Operand(-1));
+  if ((flags & SIZE_IN_WORDS) != 0) {
+    ShiftLeftImm(scratch2, object_size, Operand(kPointerSizeLog2));
+    addc(scratch2, result, scratch2);
+  } else {
+    addc(scratch2, result, object_size);
+  }
+  addze(r0, r0, LeaveOE, SetRC);
+  beq(gc_required, cr0);
+  cmpl(scratch2, ip);
+  bgt(gc_required);
+
+  // Update allocation top. result temporarily holds the new top.
+  if (emit_debug_code()) {
+    andi(r0, scratch2, Operand(kObjectAlignmentMask));
+    Check(eq, kUnalignedAllocationInNewSpace, cr0);
+  }
+  StoreP(scratch2, MemOperand(topaddr));
+
+  // Tag object if requested.
+  if ((flags & TAG_OBJECT) != 0) {
+    addi(result, result, Operand(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.
+  mov(r0, Operand(~kHeapObjectTagMask));
+  and_(object, object, r0);
+// was.. and_(object, object, Operand(~kHeapObjectTagMask));
+#ifdef DEBUG
+  // Check that the object un-allocated is below the current top.
+  mov(scratch, Operand(new_space_allocation_top));
+  LoadP(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, Operand(new_space_allocation_top));
+  StoreP(object, MemOperand(scratch));
+}
+
+
+void MacroAssembler::AllocateTwoByteString(Register result, Register length,
+                                           Register scratch1, Register scratch2,
+                                           Register scratch3,
+                                           Label* gc_required) {
+  // Calculate the number of bytes needed for the characters in the string while
+  // observing object alignment.
+  DCHECK((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0);
+  slwi(scratch1, length, Operand(1));  // Length in bytes, not chars.
+  addi(scratch1, scratch1,
+       Operand(kObjectAlignmentMask + SeqTwoByteString::kHeaderSize));
+  mov(r0, Operand(~kObjectAlignmentMask));
+  and_(scratch1, scratch1, r0);
+
+  // 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) {
+  // Calculate the number of bytes needed for the characters in the string while
+  // observing object alignment.
+  DCHECK((SeqOneByteString::kHeaderSize & kObjectAlignmentMask) == 0);
+  DCHECK(kCharSize == 1);
+  addi(scratch1, length,
+       Operand(kObjectAlignmentMask + SeqOneByteString::kHeaderSize));
+  li(r0, Operand(~kObjectAlignmentMask));
+  and_(scratch1, scratch1, r0);
+
+  // 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) {
+  Allocate(ConsString::kSize, result, scratch1, scratch2, gc_required,
+           TAG_OBJECT);
+
+  InitializeNewString(result, length, Heap::kConsAsciiStringMapRootIndex,
+                      scratch1, scratch2);
+}
+
+
+void MacroAssembler::AllocateTwoByteSlicedString(Register result,
+                                                 Register length,
+                                                 Register scratch1,
+                                                 Register scratch2,
+                                                 Label* gc_required) {
+  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) {
+  Allocate(SlicedString::kSize, result, scratch1, scratch2, gc_required,
+           TAG_OBJECT);
+
+  InitializeNewString(result, length, Heap::kSlicedAsciiStringMapRootIndex,
+                      scratch1, scratch2);
+}
+
+
+void MacroAssembler::CompareObjectType(Register object, Register map,
+                                       Register type_reg, InstanceType type) {
+  const Register temp = type_reg.is(no_reg) ? ip : type_reg;
+
+  LoadP(map, FieldMemOperand(object, HeapObject::kMapOffset));
+  CompareInstanceType(map, temp, type);
+}
+
+
+void MacroAssembler::CheckObjectTypeRange(Register object, Register map,
+                                          InstanceType min_type,
+                                          InstanceType max_type,
+                                          Label* false_label) {
+  STATIC_ASSERT(Map::kInstanceTypeOffset < 4096);
+  STATIC_ASSERT(LAST_TYPE < 256);
+  LoadP(map, FieldMemOperand(object, HeapObject::kMapOffset));
+  lbz(ip, FieldMemOperand(map, Map::kInstanceTypeOffset));
+  subi(ip, ip, Operand(min_type));
+  cmpli(ip, Operand(max_type - min_type));
+  bgt(false_label);
+}
+
+
+void MacroAssembler::CompareInstanceType(Register map, Register type_reg,
+                                         InstanceType type) {
+  STATIC_ASSERT(Map::kInstanceTypeOffset < 4096);
+  STATIC_ASSERT(LAST_TYPE < 256);
+  lbz(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
+  cmpi(type_reg, Operand(type));
+}
+
+
+void MacroAssembler::CompareRoot(Register obj, Heap::RootListIndex index) {
+  DCHECK(!obj.is(ip));
+  LoadRoot(ip, index);
+  cmp(obj, ip);
+}
+
+
+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);
+  lbz(scratch, FieldMemOperand(map, Map::kBitField2Offset));
+  STATIC_ASSERT(Map::kMaximumBitField2FastHoleyElementValue < 0x8000);
+  cmpli(scratch, Operand(Map::kMaximumBitField2FastHoleyElementValue));
+  bgt(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);
+  lbz(scratch, FieldMemOperand(map, Map::kBitField2Offset));
+  cmpli(scratch, Operand(Map::kMaximumBitField2FastHoleySmiElementValue));
+  ble(fail);
+  cmpli(scratch, Operand(Map::kMaximumBitField2FastHoleyElementValue));
+  bgt(fail);
+}
+
+
+void MacroAssembler::CheckFastSmiElements(Register map, Register scratch,
+                                          Label* fail) {
+  STATIC_ASSERT(FAST_SMI_ELEMENTS == 0);
+  STATIC_ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
+  lbz(scratch, FieldMemOperand(map, Map::kBitField2Offset));
+  cmpli(scratch, Operand(Map::kMaximumBitField2FastHoleySmiElementValue));
+  bgt(fail);
+}
+
+
+void MacroAssembler::StoreNumberToDoubleElements(
+    Register value_reg, Register key_reg, Register elements_reg,
+    Register scratch1, DoubleRegister double_scratch, Label* fail,
+    int elements_offset) {
+  Label smi_value, store;
+
+  // Handle smi values specially.
+  JumpIfSmi(value_reg, &smi_value);
+
+  // Ensure that the object is a heap number
+  CheckMap(value_reg, scratch1, isolate()->factory()->heap_number_map(), fail,
+           DONT_DO_SMI_CHECK);
+
+  lfd(double_scratch, FieldMemOperand(value_reg, HeapNumber::kValueOffset));
+  // Force a canonical NaN.
+  CanonicalizeNaN(double_scratch);
+  b(&store);
+
+  bind(&smi_value);
+  SmiToDouble(double_scratch, value_reg);
+
+  bind(&store);
+  SmiToDoubleArrayOffset(scratch1, key_reg);
+  add(scratch1, elements_reg, scratch1);
+  stfd(double_scratch, FieldMemOperand(scratch1, FixedDoubleArray::kHeaderSize -
+                                                     elements_offset));
+}
+
+
+void MacroAssembler::AddAndCheckForOverflow(Register dst, Register left,
+                                            Register right,
+                                            Register overflow_dst,
+                                            Register scratch) {
+  DCHECK(!dst.is(overflow_dst));
+  DCHECK(!dst.is(scratch));
+  DCHECK(!overflow_dst.is(scratch));
+  DCHECK(!overflow_dst.is(left));
+  DCHECK(!overflow_dst.is(right));
+
+  // C = A+B; C overflows if A/B have same sign and C has diff sign than A
+  if (dst.is(left)) {
+    mr(scratch, left);            // Preserve left.
+    add(dst, left, right);        // Left is overwritten.
+    xor_(scratch, dst, scratch);  // Original left.
+    xor_(overflow_dst, dst, right);
+    and_(overflow_dst, overflow_dst, scratch, SetRC);
+  } else if (dst.is(right)) {
+    mr(scratch, right);           // Preserve right.
+    add(dst, left, right);        // Right is overwritten.
+    xor_(scratch, dst, scratch);  // Original right.
+    xor_(overflow_dst, dst, left);
+    and_(overflow_dst, overflow_dst, scratch, SetRC);
+  } else {
+    add(dst, left, right);
+    xor_(overflow_dst, dst, left);
+    xor_(scratch, dst, right);
+    and_(overflow_dst, scratch, overflow_dst, SetRC);
+  }
+}
+
+void MacroAssembler::SubAndCheckForOverflow(Register dst, Register left,
+                                            Register right,
+                                            Register overflow_dst,
+                                            Register scratch) {
+  DCHECK(!dst.is(overflow_dst));
+  DCHECK(!dst.is(scratch));
+  DCHECK(!overflow_dst.is(scratch));
+  DCHECK(!overflow_dst.is(left));
+  DCHECK(!overflow_dst.is(right));
+
+  // C = A-B; C overflows if A/B have diff signs and C has diff sign than A
+  if (dst.is(left)) {
+    mr(scratch, left);      // Preserve left.
+    sub(dst, left, right);  // Left is overwritten.
+    xor_(overflow_dst, dst, scratch);
+    xor_(scratch, scratch, right);
+    and_(overflow_dst, overflow_dst, scratch, SetRC);
+  } else if (dst.is(right)) {
+    mr(scratch, right);     // Preserve right.
+    sub(dst, left, right);  // Right is overwritten.
+    xor_(overflow_dst, dst, left);
+    xor_(scratch, left, scratch);
+    and_(overflow_dst, overflow_dst, scratch, SetRC);
+  } else {
+    sub(dst, left, right);
+    xor_(overflow_dst, dst, left);
+    xor_(scratch, left, right);
+    and_(overflow_dst, scratch, overflow_dst, SetRC);
+  }
+}
+
+
+void MacroAssembler::CompareMap(Register obj, Register scratch, Handle<Map> map,
+                                Label* early_success) {
+  LoadP(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
+  CompareMap(scratch, map, early_success);
+}
+
+
+void MacroAssembler::CompareMap(Register obj_map, Handle<Map> map,
+                                Label* early_success) {
+  mov(r0, Operand(map));
+  cmp(obj_map, r0);
+}
+
+
+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);
+  }
+
+  Label success;
+  CompareMap(obj, scratch, map, &success);
+  bne(fail);
+  bind(&success);
+}
+
+
+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);
+  }
+  LoadP(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
+  LoadRoot(ip, index);
+  cmp(scratch, ip);
+  bne(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);
+  }
+  LoadP(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
+  mov(ip, Operand(map));
+  cmp(scratch, ip);
+  bne(&fail);
+  Jump(success, RelocInfo::CODE_TARGET, al);
+  bind(&fail);
+}
+
+
+void MacroAssembler::TryGetFunctionPrototype(Register function, Register result,
+                                             Register scratch, Label* miss,
+                                             bool miss_on_bound_function) {
+  Label non_instance;
+  if (miss_on_bound_function) {
+    // Check that the receiver isn't a smi.
+    JumpIfSmi(function, miss);
+
+    // Check that the function really is a function.  Load map into result reg.
+    CompareObjectType(function, result, scratch, JS_FUNCTION_TYPE);
+    bne(miss);
+
+    LoadP(scratch,
+          FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
+    lwz(scratch,
+        FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset));
+    TestBit(scratch,
+#if V8_TARGET_ARCH_PPC64
+            SharedFunctionInfo::kBoundFunction,
+#else
+            SharedFunctionInfo::kBoundFunction + kSmiTagSize,
+#endif
+            r0);
+    bne(miss, cr0);
+
+    // Make sure that the function has an instance prototype.
+    lbz(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
+    andi(r0, scratch, Operand(1 << Map::kHasNonInstancePrototype));
+    bne(&non_instance, cr0);
+  }
+
+  // Get the prototype or initial map from the function.
+  LoadP(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.
+  LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+  cmp(result, ip);
+  beq(miss);
+
+  // If the function does not have an initial map, we're done.
+  Label done;
+  CompareObjectType(result, scratch, scratch, MAP_TYPE);
+  bne(&done);
+
+  // Get the prototype from the initial map.
+  LoadP(result, FieldMemOperand(result, Map::kPrototypeOffset));
+
+  if (miss_on_bound_function) {
+    b(&done);
+
+    // Non-instance prototype: Fetch prototype from constructor field
+    // in initial map.
+    bind(&non_instance);
+    LoadP(result, FieldMemOperand(result, Map::kConstructorOffset));
+  }
+
+  // All done.
+  bind(&done);
+}
+
+
+void MacroAssembler::CallStub(CodeStub* stub, TypeFeedbackId ast_id,
+                              Condition cond) {
+  DCHECK(AllowThisStubCall(stub));  // Stub calls are not allowed in some stubs.
+  Call(stub->GetCode(), RelocInfo::CODE_TARGET, ast_id, cond);
+}
+
+
+void MacroAssembler::TailCallStub(CodeStub* stub, Condition cond) {
+  Jump(stub->GetCode(), RelocInfo::CODE_TARGET, cond);
+}
+
+
+static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
+  return ref0.address() - ref1.address();
+}
+
+
+void MacroAssembler::CallApiFunctionAndReturn(
+    Register function_address, ExternalReference thunk_ref, int stack_space,
+    MemOperand return_value_operand, MemOperand* context_restore_operand) {
+  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);
+
+  DCHECK(function_address.is(r4) || function_address.is(r5));
+  Register scratch = r6;
+
+  Label profiler_disabled;
+  Label end_profiler_check;
+  mov(scratch, Operand(ExternalReference::is_profiling_address(isolate())));
+  lbz(scratch, MemOperand(scratch, 0));
+  cmpi(scratch, Operand::Zero());
+  beq(&profiler_disabled);
+
+  // Additional parameter is the address of the actual callback.
+  mov(scratch, Operand(thunk_ref));
+  jmp(&end_profiler_check);
+
+  bind(&profiler_disabled);
+  mr(scratch, function_address);
+  bind(&end_profiler_check);
+
+  // Allocate HandleScope in callee-save registers.
+  // r17 - next_address
+  // r14 - next_address->kNextOffset
+  // r15 - next_address->kLimitOffset
+  // r16 - next_address->kLevelOffset
+  mov(r17, Operand(next_address));
+  LoadP(r14, MemOperand(r17, kNextOffset));
+  LoadP(r15, MemOperand(r17, kLimitOffset));
+  lwz(r16, MemOperand(r17, kLevelOffset));
+  addi(r16, r16, Operand(1));
+  stw(r16, MemOperand(r17, kLevelOffset));
+
+  if (FLAG_log_timer_events) {
+    FrameScope frame(this, StackFrame::MANUAL);
+    PushSafepointRegisters();
+    PrepareCallCFunction(1, r3);
+    mov(r3, Operand(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(isolate());
+  stub.GenerateCall(this, scratch);
+
+  if (FLAG_log_timer_events) {
+    FrameScope frame(this, StackFrame::MANUAL);
+    PushSafepointRegisters();
+    PrepareCallCFunction(1, r3);
+    mov(r3, Operand(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
+  LoadP(r3, return_value_operand);
+  bind(&return_value_loaded);
+  // No more valid handles (the result handle was the last one). Restore
+  // previous handle scope.
+  StoreP(r14, MemOperand(r17, kNextOffset));
+  if (emit_debug_code()) {
+    lwz(r4, MemOperand(r17, kLevelOffset));
+    cmp(r4, r16);
+    Check(eq, kUnexpectedLevelAfterReturnFromApiCall);
+  }
+  subi(r16, r16, Operand(1));
+  stw(r16, MemOperand(r17, kLevelOffset));
+  LoadP(ip, MemOperand(r17, kLimitOffset));
+  cmp(r15, ip);
+  bne(&delete_allocated_handles);
+
+  // Check if the function scheduled an exception.
+  bind(&leave_exit_frame);
+  LoadRoot(r14, Heap::kTheHoleValueRootIndex);
+  mov(ip, Operand(ExternalReference::scheduled_exception_address(isolate())));
+  LoadP(r15, MemOperand(ip));
+  cmp(r14, r15);
+  bne(&promote_scheduled_exception);
+  bind(&exception_handled);
+
+  bool restore_context = context_restore_operand != NULL;
+  if (restore_context) {
+    LoadP(cp, *context_restore_operand);
+  }
+  // LeaveExitFrame expects unwind space to be in a register.
+  mov(r14, Operand(stack_space));
+  LeaveExitFrame(false, r14, !restore_context);
+  blr();
+
+  bind(&promote_scheduled_exception);
+  {
+    FrameScope frame(this, StackFrame::INTERNAL);
+    CallExternalReference(
+        ExternalReference(Runtime::kPromoteScheduledException, isolate()), 0);
+  }
+  jmp(&exception_handled);
+
+  // HandleScope limit has changed. Delete allocated extensions.
+  bind(&delete_allocated_handles);
+  StoreP(r15, MemOperand(r17, kLimitOffset));
+  mr(r14, r3);
+  PrepareCallCFunction(1, r15);
+  mov(r3, Operand(ExternalReference::isolate_address(isolate())));
+  CallCFunction(ExternalReference::delete_handle_scope_extensions(isolate()),
+                1);
+  mr(r3, r14);
+  b(&leave_exit_frame);
+}
+
+
+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.
+  DCHECK(TenToThe(String::kMaxCachedArrayIndexLength) <
+         (1 << String::kArrayIndexValueBits));
+  DecodeFieldToSmi<String::ArrayIndexValueBits>(index, hash);
+}
+
+
+void MacroAssembler::SmiToDouble(DoubleRegister value, Register smi) {
+  SmiUntag(ip, smi);
+  ConvertIntToDouble(ip, value);
+}
+
+
+void MacroAssembler::TestDoubleIsInt32(DoubleRegister double_input,
+                                       Register scratch1, Register scratch2,
+                                       DoubleRegister double_scratch) {
+  TryDoubleToInt32Exact(scratch1, double_input, scratch2, double_scratch);
+}
+
+
+void MacroAssembler::TryDoubleToInt32Exact(Register result,
+                                           DoubleRegister double_input,
+                                           Register scratch,
+                                           DoubleRegister double_scratch) {
+  Label done;
+  DCHECK(!double_input.is(double_scratch));
+
+  ConvertDoubleToInt64(double_input,
+#if !V8_TARGET_ARCH_PPC64
+                       scratch,
+#endif
+                       result, double_scratch);
+
+#if V8_TARGET_ARCH_PPC64
+  TestIfInt32(result, scratch, r0);
+#else
+  TestIfInt32(scratch, result, r0);
+#endif
+  bne(&done);
+
+  // convert back and compare
+  fcfid(double_scratch, double_scratch);
+  fcmpu(double_scratch, double_input);
+  bind(&done);
+}
+
+
+void MacroAssembler::TryInt32Floor(Register result, DoubleRegister double_input,
+                                   Register input_high, Register scratch,
+                                   DoubleRegister double_scratch, Label* done,
+                                   Label* exact) {
+  DCHECK(!result.is(input_high));
+  DCHECK(!double_input.is(double_scratch));
+  Label exception;
+
+  MovDoubleHighToInt(input_high, double_input);
+
+  // Test for NaN/Inf
+  ExtractBitMask(result, input_high, HeapNumber::kExponentMask);
+  cmpli(result, Operand(0x7ff));
+  beq(&exception);
+
+  // Convert (rounding to -Inf)
+  ConvertDoubleToInt64(double_input,
+#if !V8_TARGET_ARCH_PPC64
+                       scratch,
+#endif
+                       result, double_scratch, kRoundToMinusInf);
+
+// Test for overflow
+#if V8_TARGET_ARCH_PPC64
+  TestIfInt32(result, scratch, r0);
+#else
+  TestIfInt32(scratch, result, r0);
+#endif
+  bne(&exception);
+
+  // Test for exactness
+  fcfid(double_scratch, double_scratch);
+  fcmpu(double_scratch, double_input);
+  beq(exact);
+  b(done);
+
+  bind(&exception);
+}
+
+
+void MacroAssembler::TryInlineTruncateDoubleToI(Register result,
+                                                DoubleRegister double_input,
+                                                Label* done) {
+  DoubleRegister double_scratch = kScratchDoubleReg;
+  Register scratch = ip;
+
+  ConvertDoubleToInt64(double_input,
+#if !V8_TARGET_ARCH_PPC64
+                       scratch,
+#endif
+                       result, double_scratch);
+
+// Test for overflow
+#if V8_TARGET_ARCH_PPC64
+  TestIfInt32(result, scratch, r0);
+#else
+  TestIfInt32(scratch, result, r0);
+#endif
+  beq(done);
+}
+
+
+void MacroAssembler::TruncateDoubleToI(Register result,
+                                       DoubleRegister double_input) {
+  Label done;
+
+  TryInlineTruncateDoubleToI(result, double_input, &done);
+
+  // If we fell through then inline version didn't succeed - call stub instead.
+  mflr(r0);
+  push(r0);
+  // Put input on stack.
+  stfdu(double_input, MemOperand(sp, -kDoubleSize));
+
+  DoubleToIStub stub(isolate(), sp, result, 0, true, true);
+  CallStub(&stub);
+
+  addi(sp, sp, Operand(kDoubleSize));
+  pop(r0);
+  mtlr(r0);
+
+  bind(&done);
+}
+
+
+void MacroAssembler::TruncateHeapNumberToI(Register result, Register object) {
+  Label done;
+  DoubleRegister double_scratch = kScratchDoubleReg;
+  DCHECK(!result.is(object));
+
+  lfd(double_scratch, FieldMemOperand(object, HeapNumber::kValueOffset));
+  TryInlineTruncateDoubleToI(result, double_scratch, &done);
+
+  // If we fell through then inline version didn't succeed - call stub instead.
+  mflr(r0);
+  push(r0);
+  DoubleToIStub stub(isolate(), object, result,
+                     HeapNumber::kValueOffset - kHeapObjectTag, true, true);
+  CallStub(&stub);
+  pop(r0);
+  mtlr(r0);
+
+  bind(&done);
+}
+
+
+void MacroAssembler::TruncateNumberToI(Register object, Register result,
+                                       Register heap_number_map,
+                                       Register scratch1, Label* not_number) {
+  Label done;
+  DCHECK(!result.is(object));
+
+  UntagAndJumpIfSmi(result, object, &done);
+  JumpIfNotHeapNumber(object, heap_number_map, scratch1, not_number);
+  TruncateHeapNumberToI(result, object);
+
+  bind(&done);
+}
+
+
+void MacroAssembler::GetLeastBitsFromSmi(Register dst, Register src,
+                                         int num_least_bits) {
+#if V8_TARGET_ARCH_PPC64
+  rldicl(dst, src, kBitsPerPointer - kSmiShift,
+         kBitsPerPointer - num_least_bits);
+#else
+  rlwinm(dst, src, kBitsPerPointer - kSmiShift,
+         kBitsPerPointer - num_least_bits, 31);
+#endif
+}
+
+
+void MacroAssembler::GetLeastBitsFromInt32(Register dst, Register src,
+                                           int num_least_bits) {
+  rlwinm(dst, src, 0, 32 - num_least_bits, 31);
+}
+
+
+void MacroAssembler::CallRuntime(const Runtime::Function* f, int num_arguments,
+                                 SaveFPRegsMode save_doubles) {
+  // All parameters are on the stack.  r3 has the return value after call.
+
+  // If the expected number of arguments of the runtime function is
+  // constant, we check that the actual number of arguments match the
+  // expectation.
+  CHECK(f->nargs < 0 || f->nargs == num_arguments);
+
+  // 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(r3, Operand(num_arguments));
+  mov(r4, Operand(ExternalReference(f, isolate())));
+  CEntryStub stub(isolate(),
+#if V8_TARGET_ARCH_PPC64
+                  f->result_size,
+#else
+                  1,
+#endif
+                  save_doubles);
+  CallStub(&stub);
+}
+
+
+void MacroAssembler::CallExternalReference(const ExternalReference& ext,
+                                           int num_arguments) {
+  mov(r3, Operand(num_arguments));
+  mov(r4, Operand(ext));
+
+  CEntryStub stub(isolate(), 1);
+  CallStub(&stub);
+}
+
+
+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(r3, Operand(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::JumpToExternalReference(const ExternalReference& builtin) {
+  mov(r4, Operand(builtin));
+  CEntryStub stub(isolate(), 1);
+  Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
+void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id, InvokeFlag flag,
+                                   const CallWrapper& call_wrapper) {
+  // You can't call a builtin without a valid frame.
+  DCHECK(flag == JUMP_FUNCTION || has_frame());
+
+  GetBuiltinEntry(r5, id);
+  if (flag == CALL_FUNCTION) {
+    call_wrapper.BeforeCall(CallSize(r5));
+    Call(r5);
+    call_wrapper.AfterCall();
+  } else {
+    DCHECK(flag == JUMP_FUNCTION);
+    Jump(r5);
+  }
+}
+
+
+void MacroAssembler::GetBuiltinFunction(Register target,
+                                        Builtins::JavaScript id) {
+  // Load the builtins object into target register.
+  LoadP(target,
+        MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
+  LoadP(target, FieldMemOperand(target, GlobalObject::kBuiltinsOffset));
+  // Load the JavaScript builtin function from the builtins object.
+  LoadP(target,
+        FieldMemOperand(target, JSBuiltinsObject::OffsetOfFunctionWithId(id)),
+        r0);
+}
+
+
+void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) {
+  DCHECK(!target.is(r4));
+  GetBuiltinFunction(r4, id);
+  // Load the code entry point from the builtins object.
+  LoadP(target, FieldMemOperand(r4, JSFunction::kCodeEntryOffset));
+}
+
+
+void MacroAssembler::SetCounter(StatsCounter* counter, int value,
+                                Register scratch1, Register scratch2) {
+  if (FLAG_native_code_counters && counter->Enabled()) {
+    mov(scratch1, Operand(value));
+    mov(scratch2, Operand(ExternalReference(counter)));
+    stw(scratch1, MemOperand(scratch2));
+  }
+}
+
+
+void MacroAssembler::IncrementCounter(StatsCounter* counter, int value,
+                                      Register scratch1, Register scratch2) {
+  DCHECK(value > 0);
+  if (FLAG_native_code_counters && counter->Enabled()) {
+    mov(scratch2, Operand(ExternalReference(counter)));
+    lwz(scratch1, MemOperand(scratch2));
+    addi(scratch1, scratch1, Operand(value));
+    stw(scratch1, MemOperand(scratch2));
+  }
+}
+
+
+void MacroAssembler::DecrementCounter(StatsCounter* counter, int value,
+                                      Register scratch1, Register scratch2) {
+  DCHECK(value > 0);
+  if (FLAG_native_code_counters && counter->Enabled()) {
+    mov(scratch2, Operand(ExternalReference(counter)));
+    lwz(scratch1, MemOperand(scratch2));
+    subi(scratch1, scratch1, Operand(value));
+    stw(scratch1, MemOperand(scratch2));
+  }
+}
+
+
+void MacroAssembler::Assert(Condition cond, BailoutReason reason,
+                            CRegister cr) {
+  if (emit_debug_code()) Check(cond, reason, cr);
+}
+
+
+void MacroAssembler::AssertFastElements(Register elements) {
+  if (emit_debug_code()) {
+    DCHECK(!elements.is(ip));
+    Label ok;
+    push(elements);
+    LoadP(elements, FieldMemOperand(elements, HeapObject::kMapOffset));
+    LoadRoot(ip, Heap::kFixedArrayMapRootIndex);
+    cmp(elements, ip);
+    beq(&ok);
+    LoadRoot(ip, Heap::kFixedDoubleArrayMapRootIndex);
+    cmp(elements, ip);
+    beq(&ok);
+    LoadRoot(ip, Heap::kFixedCOWArrayMapRootIndex);
+    cmp(elements, ip);
+    beq(&ok);
+    Abort(kJSObjectWithFastElementsMapHasSlowElements);
+    bind(&ok);
+    pop(elements);
+  }
+}
+
+
+void MacroAssembler::Check(Condition cond, BailoutReason reason, CRegister cr) {
+  Label L;
+  b(cond, &L, cr);
+  Abort(reason);
+  // will not return here
+  bind(&L);
+}
+
+
+void MacroAssembler::Abort(BailoutReason reason) {
+  Label abort_start;
+  bind(&abort_start);
+#ifdef DEBUG
+  const char* msg = GetBailoutReason(reason);
+  if (msg != NULL) {
+    RecordComment("Abort message: ");
+    RecordComment(msg);
+  }
+
+  if (FLAG_trap_on_abort) {
+    stop(msg);
+    return;
+  }
+#endif
+
+  LoadSmiLiteral(r0, Smi::FromInt(reason));
+  push(r0);
+  // Disable stub call restrictions to always allow calls to abort.
+  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);
+  }
+  // will not return here
+}
+
+
+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.
+    LoadP(dst, MemOperand(cp, Context::SlotOffset(Context::PREVIOUS_INDEX)));
+    for (int i = 1; i < context_chain_length; i++) {
+      LoadP(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 esi).
+    mr(dst, cp);
+  }
+}
+
+
+void MacroAssembler::LoadTransitionedArrayMapConditional(
+    ElementsKind expected_kind, ElementsKind transitioned_kind,
+    Register map_in_out, Register scratch, Label* no_map_match) {
+  // Load the global or builtins object from the current context.
+  LoadP(scratch,
+        MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
+  LoadP(scratch, FieldMemOperand(scratch, GlobalObject::kNativeContextOffset));
+
+  // Check that the function's map is the same as the expected cached map.
+  LoadP(scratch,
+        MemOperand(scratch, Context::SlotOffset(Context::JS_ARRAY_MAPS_INDEX)));
+  size_t offset = expected_kind * kPointerSize + FixedArrayBase::kHeaderSize;
+  LoadP(ip, FieldMemOperand(scratch, offset));
+  cmp(map_in_out, ip);
+  bne(no_map_match);
+
+  // Use the transitioned cached map.
+  offset = transitioned_kind * kPointerSize + FixedArrayBase::kHeaderSize;
+  LoadP(map_in_out, FieldMemOperand(scratch, offset));
+}
+
+
+void MacroAssembler::LoadGlobalFunction(int index, Register function) {
+  // Load the global or builtins object from the current context.
+  LoadP(function,
+        MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
+  // Load the native context from the global or builtins object.
+  LoadP(function,
+        FieldMemOperand(function, GlobalObject::kNativeContextOffset));
+  // Load the function from the native context.
+  LoadP(function, MemOperand(function, Context::SlotOffset(index)), r0);
+}
+
+
+void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
+                                                  Register map,
+                                                  Register scratch) {
+  // Load the initial map. The global functions all have initial maps.
+  LoadP(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);
+  }
+}
+
+
+void MacroAssembler::JumpIfNotPowerOfTwoOrZero(
+    Register reg, Register scratch, Label* not_power_of_two_or_zero) {
+  subi(scratch, reg, Operand(1));
+  cmpi(scratch, Operand::Zero());
+  blt(not_power_of_two_or_zero);
+  and_(r0, scratch, reg, SetRC);
+  bne(not_power_of_two_or_zero, cr0);
+}
+
+
+void MacroAssembler::JumpIfNotPowerOfTwoOrZeroAndNeg(Register reg,
+                                                     Register scratch,
+                                                     Label* zero_and_neg,
+                                                     Label* not_power_of_two) {
+  subi(scratch, reg, Operand(1));
+  cmpi(scratch, Operand::Zero());
+  blt(zero_and_neg);
+  and_(r0, scratch, reg, SetRC);
+  bne(not_power_of_two, cr0);
+}
+
+#if !V8_TARGET_ARCH_PPC64
+void MacroAssembler::SmiTagCheckOverflow(Register reg, Register overflow) {
+  DCHECK(!reg.is(overflow));
+  mr(overflow, reg);  // Save original value.
+  SmiTag(reg);
+  xor_(overflow, overflow, reg, SetRC);  // Overflow if (value ^ 2 * value) < 0.
+}
+
+
+void MacroAssembler::SmiTagCheckOverflow(Register dst, Register src,
+                                         Register overflow) {
+  if (dst.is(src)) {
+    // Fall back to slower case.
+    SmiTagCheckOverflow(dst, overflow);
+  } else {
+    DCHECK(!dst.is(src));
+    DCHECK(!dst.is(overflow));
+    DCHECK(!src.is(overflow));
+    SmiTag(dst, src);
+    xor_(overflow, dst, src, SetRC);  // Overflow if (value ^ 2 * value) < 0.
+  }
+}
+#endif
+
+void MacroAssembler::JumpIfNotBothSmi(Register reg1, Register reg2,
+                                      Label* on_not_both_smi) {
+  STATIC_ASSERT(kSmiTag == 0);
+  DCHECK_EQ(1, static_cast<int>(kSmiTagMask));
+  orx(r0, reg1, reg2, LeaveRC);
+  JumpIfNotSmi(r0, on_not_both_smi);
+}
+
+
+void MacroAssembler::UntagAndJumpIfSmi(Register dst, Register src,
+                                       Label* smi_case) {
+  STATIC_ASSERT(kSmiTag == 0);
+  STATIC_ASSERT(kSmiTagSize == 1);
+  TestBit(src, 0, r0);
+  SmiUntag(dst, src);
+  beq(smi_case, cr0);
+}
+
+
+void MacroAssembler::UntagAndJumpIfNotSmi(Register dst, Register src,
+                                          Label* non_smi_case) {
+  STATIC_ASSERT(kSmiTag == 0);
+  STATIC_ASSERT(kSmiTagSize == 1);
+  TestBit(src, 0, r0);
+  SmiUntag(dst, src);
+  bne(non_smi_case, cr0);
+}
+
+
+void MacroAssembler::JumpIfEitherSmi(Register reg1, Register reg2,
+                                     Label* on_either_smi) {
+  STATIC_ASSERT(kSmiTag == 0);
+  JumpIfSmi(reg1, on_either_smi);
+  JumpIfSmi(reg2, on_either_smi);
+}
+
+
+void MacroAssembler::AssertNotSmi(Register object) {
+  if (emit_debug_code()) {
+    STATIC_ASSERT(kSmiTag == 0);
+    TestIfSmi(object, r0);
+    Check(ne, kOperandIsASmi, cr0);
+  }
+}
+
+
+void MacroAssembler::AssertSmi(Register object) {
+  if (emit_debug_code()) {
+    STATIC_ASSERT(kSmiTag == 0);
+    TestIfSmi(object, r0);
+    Check(eq, kOperandIsNotSmi, cr0);
+  }
+}
+
+
+void MacroAssembler::AssertString(Register object) {
+  if (emit_debug_code()) {
+    STATIC_ASSERT(kSmiTag == 0);
+    TestIfSmi(object, r0);
+    Check(ne, kOperandIsASmiAndNotAString, cr0);
+    push(object);
+    LoadP(object, FieldMemOperand(object, HeapObject::kMapOffset));
+    CompareInstanceType(object, object, FIRST_NONSTRING_TYPE);
+    pop(object);
+    Check(lt, kOperandIsNotAString);
+  }
+}
+
+
+void MacroAssembler::AssertName(Register object) {
+  if (emit_debug_code()) {
+    STATIC_ASSERT(kSmiTag == 0);
+    TestIfSmi(object, r0);
+    Check(ne, kOperandIsASmiAndNotAName, cr0);
+    push(object);
+    LoadP(object, FieldMemOperand(object, HeapObject::kMapOffset));
+    CompareInstanceType(object, object, LAST_NAME_TYPE);
+    pop(object);
+    Check(le, kOperandIsNotAName);
+  }
+}
+
+
+void MacroAssembler::AssertUndefinedOrAllocationSite(Register object,
+                                                     Register scratch) {
+  if (emit_debug_code()) {
+    Label done_checking;
+    AssertNotSmi(object);
+    CompareRoot(object, Heap::kUndefinedValueRootIndex);
+    beq(&done_checking);
+    LoadP(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
+    CompareRoot(scratch, Heap::kAllocationSiteMapRootIndex);
+    Assert(eq, kExpectedUndefinedOrCell);
+    bind(&done_checking);
+  }
+}
+
+
+void MacroAssembler::AssertIsRoot(Register reg, Heap::RootListIndex index) {
+  if (emit_debug_code()) {
+    CompareRoot(reg, index);
+    Check(eq, kHeapNumberMapRegisterClobbered);
+  }
+}
+
+
+void MacroAssembler::JumpIfNotHeapNumber(Register object,
+                                         Register heap_number_map,
+                                         Register scratch,
+                                         Label* on_not_heap_number) {
+  LoadP(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
+  AssertIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
+  cmp(scratch, heap_number_map);
+  bne(on_not_heap_number);
+}
+
+
+void MacroAssembler::LookupNumberStringCache(Register object, Register result,
+                                             Register scratch1,
+                                             Register scratch2,
+                                             Register scratch3,
+                                             Label* not_found) {
+  // 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.
+  LoadP(mask, FieldMemOperand(number_string_cache, FixedArray::kLengthOffset));
+  // Divide length by two (length is a smi).
+  ShiftRightArithImm(mask, mask, kSmiTagSize + kSmiShiftSize + 1);
+  subi(mask, mask, Operand(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(8 == kDoubleSize);
+  lwz(scratch1, FieldMemOperand(object, HeapNumber::kExponentOffset));
+  lwz(scratch2, FieldMemOperand(object, HeapNumber::kMantissaOffset));
+  xor_(scratch1, scratch1, scratch2);
+  and_(scratch1, scratch1, mask);
+
+  // Calculate address of entry in string cache: each entry consists
+  // of two pointer sized fields.
+  ShiftLeftImm(scratch1, scratch1, Operand(kPointerSizeLog2 + 1));
+  add(scratch1, number_string_cache, scratch1);
+
+  Register probe = mask;
+  LoadP(probe, FieldMemOperand(scratch1, FixedArray::kHeaderSize));
+  JumpIfSmi(probe, not_found);
+  lfd(d0, FieldMemOperand(object, HeapNumber::kValueOffset));
+  lfd(d1, FieldMemOperand(probe, HeapNumber::kValueOffset));
+  fcmpu(d0, d1);
+  bne(not_found);  // The cache did not contain this value.
+  b(&load_result_from_cache);
+
+  bind(&is_smi);
+  Register scratch = scratch1;
+  SmiUntag(scratch, object);
+  and_(scratch, mask, scratch);
+  // Calculate address of entry in string cache: each entry consists
+  // of two pointer sized fields.
+  ShiftLeftImm(scratch, scratch, Operand(kPointerSizeLog2 + 1));
+  add(scratch, number_string_cache, scratch);
+
+  // Check if the entry is the smi we are looking for.
+  LoadP(probe, FieldMemOperand(scratch, FixedArray::kHeaderSize));
+  cmp(object, probe);
+  bne(not_found);
+
+  // Get the result from the cache.
+  bind(&load_result_from_cache);
+  LoadP(result,
+        FieldMemOperand(scratch, FixedArray::kHeaderSize + kPointerSize));
+  IncrementCounter(isolate()->counters()->number_to_string_native(), 1,
+                   scratch1, scratch2);
+}
+
+
+void MacroAssembler::JumpIfNonSmisNotBothSequentialAsciiStrings(
+    Register first, Register second, Register scratch1, Register scratch2,
+    Label* failure) {
+  // Test that both first and second are sequential ASCII strings.
+  // Assume that they are non-smis.
+  LoadP(scratch1, FieldMemOperand(first, HeapObject::kMapOffset));
+  LoadP(scratch2, FieldMemOperand(second, HeapObject::kMapOffset));
+  lbz(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset));
+  lbz(scratch2, FieldMemOperand(scratch2, Map::kInstanceTypeOffset));
+
+  JumpIfBothInstanceTypesAreNotSequentialAscii(scratch1, scratch2, scratch1,
+                                               scratch2, failure);
+}
+
+void MacroAssembler::JumpIfNotBothSequentialAsciiStrings(Register first,
+                                                         Register second,
+                                                         Register scratch1,
+                                                         Register scratch2,
+                                                         Label* failure) {
+  // Check that neither is a smi.
+  and_(scratch1, first, second);
+  JumpIfSmi(scratch1, failure);
+  JumpIfNonSmisNotBothSequentialAsciiStrings(first, second, scratch1, scratch2,
+                                             failure);
+}
+
+
+void MacroAssembler::JumpIfNotUniqueName(Register reg, Label* not_unique_name) {
+  STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
+  Label succeed;
+  andi(r0, reg, Operand(kIsNotStringMask | kIsNotInternalizedMask));
+  beq(&succeed, cr0);
+  cmpi(reg, Operand(SYMBOL_TYPE));
+  bne(not_unique_name);
+
+  bind(&succeed);
+}
+
+
+// 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, Register scratch1,
+                                        Register scratch2,
+                                        Register heap_number_map,
+                                        Label* gc_required,
+                                        TaggingMode tagging_mode,
+                                        MutableMode mode) {
+  // 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,
+           tagging_mode == TAG_RESULT ? TAG_OBJECT : NO_ALLOCATION_FLAGS);
+
+  Heap::RootListIndex map_index = mode == MUTABLE
+                                      ? Heap::kMutableHeapNumberMapRootIndex
+                                      : Heap::kHeapNumberMapRootIndex;
+  AssertIsRoot(heap_number_map, map_index);
+
+  // Store heap number map in the allocated object.
+  if (tagging_mode == TAG_RESULT) {
+    StoreP(heap_number_map, FieldMemOperand(result, HeapObject::kMapOffset),
+           r0);
+  } else {
+    StoreP(heap_number_map, MemOperand(result, HeapObject::kMapOffset));
+  }
+}
+
+
+void MacroAssembler::AllocateHeapNumberWithValue(
+    Register result, DoubleRegister value, Register scratch1, Register scratch2,
+    Register heap_number_map, Label* gc_required) {
+  AllocateHeapNumber(result, scratch1, scratch2, heap_number_map, gc_required);
+  stfd(value, FieldMemOperand(result, HeapNumber::kValueOffset));
+}
+
+
+// Copies a fixed number of fields of heap objects from src to dst.
+void MacroAssembler::CopyFields(Register dst, Register src, RegList temps,
+                                int field_count) {
+  // At least one bit set in the first 15 registers.
+  DCHECK((temps & ((1 << 15) - 1)) != 0);
+  DCHECK((temps & dst.bit()) == 0);
+  DCHECK((temps & src.bit()) == 0);
+  // Primitive implementation using only one temporary register.
+
+  Register tmp = no_reg;
+  // Find a temp register in temps list.
+  for (int i = 0; i < 15; i++) {
+    if ((temps & (1 << i)) != 0) {
+      tmp.set_code(i);
+      break;
+    }
+  }
+  DCHECK(!tmp.is(no_reg));
+
+  for (int i = 0; i < field_count; i++) {
+    LoadP(tmp, FieldMemOperand(src, i * kPointerSize), r0);
+    StoreP(tmp, FieldMemOperand(dst, i * kPointerSize), r0);
+  }
+}
+
+
+void MacroAssembler::CopyBytes(Register src, Register dst, Register length,
+                               Register scratch) {
+  Label align_loop, aligned, word_loop, byte_loop, byte_loop_1, done;
+
+  DCHECK(!scratch.is(r0));
+
+  cmpi(length, Operand::Zero());
+  beq(&done);
+
+  // Check src alignment and length to see whether word_loop is possible
+  andi(scratch, src, Operand(kPointerSize - 1));
+  beq(&aligned, cr0);
+  subfic(scratch, scratch, Operand(kPointerSize * 2));
+  cmp(length, scratch);
+  blt(&byte_loop);
+
+  // Align src before copying in word size chunks.
+  subi(scratch, scratch, Operand(kPointerSize));
+  mtctr(scratch);
+  bind(&align_loop);
+  lbz(scratch, MemOperand(src));
+  addi(src, src, Operand(1));
+  subi(length, length, Operand(1));
+  stb(scratch, MemOperand(dst));
+  addi(dst, dst, Operand(1));
+  bdnz(&align_loop);
+
+  bind(&aligned);
+
+  // Copy bytes in word size chunks.
+  if (emit_debug_code()) {
+    andi(r0, src, Operand(kPointerSize - 1));
+    Assert(eq, kExpectingAlignmentForCopyBytes, cr0);
+  }
+
+  ShiftRightImm(scratch, length, Operand(kPointerSizeLog2));
+  cmpi(scratch, Operand::Zero());
+  beq(&byte_loop);
+
+  mtctr(scratch);
+  bind(&word_loop);
+  LoadP(scratch, MemOperand(src));
+  addi(src, src, Operand(kPointerSize));
+  subi(length, length, Operand(kPointerSize));
+  if (CpuFeatures::IsSupported(UNALIGNED_ACCESSES)) {
+    // currently false for PPC - but possible future opt
+    StoreP(scratch, MemOperand(dst));
+    addi(dst, dst, Operand(kPointerSize));
+  } else {
+#if V8_TARGET_LITTLE_ENDIAN
+    stb(scratch, MemOperand(dst, 0));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 1));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 2));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 3));
+#if V8_TARGET_ARCH_PPC64
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 4));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 5));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 6));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 7));
+#endif
+#else
+#if V8_TARGET_ARCH_PPC64
+    stb(scratch, MemOperand(dst, 7));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 6));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 5));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 4));
+    ShiftRightImm(scratch, scratch, Operand(8));
+#endif
+    stb(scratch, MemOperand(dst, 3));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 2));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 1));
+    ShiftRightImm(scratch, scratch, Operand(8));
+    stb(scratch, MemOperand(dst, 0));
+#endif
+    addi(dst, dst, Operand(kPointerSize));
+  }
+  bdnz(&word_loop);
+
+  // Copy the last bytes if any left.
+  cmpi(length, Operand::Zero());
+  beq(&done);
+
+  bind(&byte_loop);
+  mtctr(length);
+  bind(&byte_loop_1);
+  lbz(scratch, MemOperand(src));
+  addi(src, src, Operand(1));
+  stb(scratch, MemOperand(dst));
+  addi(dst, dst, Operand(1));
+  bdnz(&byte_loop_1);
+
+  bind(&done);
+}
+
+
+void MacroAssembler::InitializeNFieldsWithFiller(Register start_offset,
+                                                 Register count,
+                                                 Register filler) {
+  Label loop;
+  mtctr(count);
+  bind(&loop);
+  StoreP(filler, MemOperand(start_offset));
+  addi(start_offset, start_offset, Operand(kPointerSize));
+  bdnz(&loop);
+}
+
+void MacroAssembler::InitializeFieldsWithFiller(Register start_offset,
+                                                Register end_offset,
+                                                Register filler) {
+  Label done;
+  sub(r0, end_offset, start_offset, LeaveOE, SetRC);
+  beq(&done, cr0);
+  ShiftRightImm(r0, r0, Operand(kPointerSizeLog2));
+  InitializeNFieldsWithFiller(start_offset, r0, filler);
+  bind(&done);
+}
+
+
+void MacroAssembler::SaveFPRegs(Register location, int first, int count) {
+  DCHECK(count > 0);
+  int cur = first;
+  subi(location, location, Operand(count * kDoubleSize));
+  for (int i = 0; i < count; i++) {
+    DoubleRegister reg = DoubleRegister::from_code(cur++);
+    stfd(reg, MemOperand(location, i * kDoubleSize));
+  }
+}
+
+
+void MacroAssembler::RestoreFPRegs(Register location, int first, int count) {
+  DCHECK(count > 0);
+  int cur = first + count - 1;
+  for (int i = count - 1; i >= 0; i--) {
+    DoubleRegister reg = DoubleRegister::from_code(cur--);
+    lfd(reg, MemOperand(location, i * kDoubleSize));
+  }
+  addi(location, location, Operand(count * kDoubleSize));
+}
+
+
+void MacroAssembler::JumpIfBothInstanceTypesAreNotSequentialAscii(
+    Register first, Register second, Register scratch1, Register scratch2,
+    Label* failure) {
+  const int kFlatAsciiStringMask =
+      kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
+  const int kFlatAsciiStringTag =
+      kStringTag | kOneByteStringTag | kSeqStringTag;
+  andi(scratch1, first, Operand(kFlatAsciiStringMask));
+  andi(scratch2, second, Operand(kFlatAsciiStringMask));
+  cmpi(scratch1, Operand(kFlatAsciiStringTag));
+  bne(failure);
+  cmpi(scratch2, Operand(kFlatAsciiStringTag));
+  bne(failure);
+}
+
+
+void MacroAssembler::JumpIfInstanceTypeIsNotSequentialAscii(Register type,
+                                                            Register scratch,
+                                                            Label* failure) {
+  const int kFlatAsciiStringMask =
+      kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
+  const int kFlatAsciiStringTag =
+      kStringTag | kOneByteStringTag | kSeqStringTag;
+  andi(scratch, type, Operand(kFlatAsciiStringMask));
+  cmpi(scratch, Operand(kFlatAsciiStringTag));
+  bne(failure);
+}
+
+static const int kRegisterPassedArguments = 8;
+
+
+int MacroAssembler::CalculateStackPassedWords(int num_reg_arguments,
+                                              int num_double_arguments) {
+  int stack_passed_words = 0;
+  if (num_double_arguments > DoubleRegister::kNumRegisters) {
+    stack_passed_words +=
+        2 * (num_double_arguments - DoubleRegister::kNumRegisters);
+  }
+  // Up to 8 simple arguments are passed in registers r3..r10.
+  if (num_reg_arguments > kRegisterPassedArguments) {
+    stack_passed_words += num_reg_arguments - kRegisterPassedArguments;
+  }
+  return stack_passed_words;
+}
+
+
+void MacroAssembler::EmitSeqStringSetCharCheck(Register string, Register index,
+                                               Register value,
+                                               uint32_t encoding_mask) {
+  Label is_object;
+  TestIfSmi(string, r0);
+  Check(ne, kNonObject, cr0);
+
+  LoadP(ip, FieldMemOperand(string, HeapObject::kMapOffset));
+  lbz(ip, FieldMemOperand(ip, Map::kInstanceTypeOffset));
+
+  andi(ip, ip, Operand(kStringRepresentationMask | kStringEncodingMask));
+  cmpi(ip, Operand(encoding_mask));
+  Check(eq, kUnexpectedStringType);
+
+// The index is assumed to be untagged coming in, tag it to compare with the
+// string length without using a temp register, it is restored at the end of
+// this function.
+#if !V8_TARGET_ARCH_PPC64
+  Label index_tag_ok, index_tag_bad;
+  JumpIfNotSmiCandidate(index, r0, &index_tag_bad);
+#endif
+  SmiTag(index, index);
+#if !V8_TARGET_ARCH_PPC64
+  b(&index_tag_ok);
+  bind(&index_tag_bad);
+  Abort(kIndexIsTooLarge);
+  bind(&index_tag_ok);
+#endif
+
+  LoadP(ip, FieldMemOperand(string, String::kLengthOffset));
+  cmp(index, ip);
+  Check(lt, kIndexIsTooLarge);
+
+  DCHECK(Smi::FromInt(0) == 0);
+  cmpi(index, Operand::Zero());
+  Check(ge, kIndexIsNegative);
+
+  SmiUntag(index, index);
+}
+
+
+void MacroAssembler::PrepareCallCFunction(int num_reg_arguments,
+                                          int num_double_arguments,
+                                          Register scratch) {
+  int frame_alignment = ActivationFrameAlignment();
+  int stack_passed_arguments =
+      CalculateStackPassedWords(num_reg_arguments, num_double_arguments);
+  int stack_space = kNumRequiredStackFrameSlots;
+
+  if (frame_alignment > kPointerSize) {
+    // Make stack end at alignment and make room for stack arguments
+    // -- preserving original value of sp.
+    mr(scratch, sp);
+    addi(sp, sp, Operand(-(stack_passed_arguments + 1) * kPointerSize));
+    DCHECK(IsPowerOf2(frame_alignment));
+    ClearRightImm(sp, sp, Operand(WhichPowerOf2(frame_alignment)));
+    StoreP(scratch, MemOperand(sp, stack_passed_arguments * kPointerSize));
+  } else {
+    // Make room for stack arguments
+    stack_space += stack_passed_arguments;
+  }
+
+  // Allocate frame with required slots to make ABI work.
+  li(r0, Operand::Zero());
+  StorePU(r0, MemOperand(sp, -stack_space * kPointerSize));
+}
+
+
+void MacroAssembler::PrepareCallCFunction(int num_reg_arguments,
+                                          Register scratch) {
+  PrepareCallCFunction(num_reg_arguments, 0, scratch);
+}
+
+
+void MacroAssembler::MovToFloatParameter(DoubleRegister src) { Move(d1, src); }
+
+
+void MacroAssembler::MovToFloatResult(DoubleRegister src) { Move(d1, src); }
+
+
+void MacroAssembler::MovToFloatParameters(DoubleRegister src1,
+                                          DoubleRegister src2) {
+  if (src2.is(d1)) {
+    DCHECK(!src1.is(d2));
+    Move(d2, src2);
+    Move(d1, src1);
+  } else {
+    Move(d1, src1);
+    Move(d2, src2);
+  }
+}
+
+
+void MacroAssembler::CallCFunction(ExternalReference function,
+                                   int num_reg_arguments,
+                                   int num_double_arguments) {
+  mov(ip, Operand(function));
+  CallCFunctionHelper(ip, num_reg_arguments, num_double_arguments);
+}
+
+
+void MacroAssembler::CallCFunction(Register function, int num_reg_arguments,
+                                   int num_double_arguments) {
+  CallCFunctionHelper(function, num_reg_arguments, num_double_arguments);
+}
+
+
+void MacroAssembler::CallCFunction(ExternalReference function,
+                                   int num_arguments) {
+  CallCFunction(function, num_arguments, 0);
+}
+
+
+void MacroAssembler::CallCFunction(Register function, int num_arguments) {
+  CallCFunction(function, num_arguments, 0);
+}
+
+
+void MacroAssembler::CallCFunctionHelper(Register function,
+                                         int num_reg_arguments,
+                                         int num_double_arguments) {
+  DCHECK(has_frame());
+// Just call directly. The function called cannot cause a GC, or
+// allow preemption, so the return address in the link register
+// stays correct.
+#if ABI_USES_FUNCTION_DESCRIPTORS && !defined(USE_SIMULATOR)
+  // AIX uses a function descriptor. When calling C code be aware
+  // of this descriptor and pick up values from it
+  LoadP(ToRegister(ABI_TOC_REGISTER), MemOperand(function, kPointerSize));
+  LoadP(ip, MemOperand(function, 0));
+  Register dest = ip;
+#elif ABI_TOC_ADDRESSABILITY_VIA_IP
+  Move(ip, function);
+  Register dest = ip;
+#else
+  Register dest = function;
+#endif
+
+  Call(dest);
+
+  // Remove frame bought in PrepareCallCFunction
+  int stack_passed_arguments =
+      CalculateStackPassedWords(num_reg_arguments, num_double_arguments);
+  int stack_space = kNumRequiredStackFrameSlots + stack_passed_arguments;
+  if (ActivationFrameAlignment() > kPointerSize) {
+    LoadP(sp, MemOperand(sp, stack_space * kPointerSize));
+  } else {
+    addi(sp, sp, Operand(stack_space * kPointerSize));
+  }
+}
+
+
+void MacroAssembler::FlushICache(Register address, size_t size,
+                                 Register scratch) {
+  Label done;
+
+  dcbf(r0, address);
+  sync();
+  icbi(r0, address);
+  isync();
+
+  // This code handles ranges which cross a single cacheline boundary.
+  // scratch is last cacheline which intersects range.
+  const int kCacheLineSizeLog2 = WhichPowerOf2(CpuFeatures::cache_line_size());
+
+  DCHECK(size > 0 && size <= (size_t)(1 << kCacheLineSizeLog2));
+  addi(scratch, address, Operand(size - 1));
+  ClearRightImm(scratch, scratch, Operand(kCacheLineSizeLog2));
+  cmpl(scratch, address);
+  ble(&done);
+
+  dcbf(r0, scratch);
+  sync();
+  icbi(r0, scratch);
+  isync();
+
+  bind(&done);
+}
+
+
+void MacroAssembler::SetRelocatedValue(Register location, Register scratch,
+                                       Register new_value) {
+  lwz(scratch, MemOperand(location));
+
+#if V8_OOL_CONSTANT_POOL
+  if (emit_debug_code()) {
+// Check that the instruction sequence is a load from the constant pool
+#if V8_TARGET_ARCH_PPC64
+    And(scratch, scratch, Operand(kOpcodeMask | (0x1f * B16)));
+    Cmpi(scratch, Operand(ADDI), r0);
+    Check(eq, kTheInstructionShouldBeALi);
+    lwz(scratch, MemOperand(location, kInstrSize));
+#endif
+    ExtractBitMask(scratch, scratch, 0x1f * B16);
+    cmpi(scratch, Operand(kConstantPoolRegister.code()));
+    Check(eq, kTheInstructionToPatchShouldBeALoadFromConstantPool);
+    // Scratch was clobbered. Restore it.
+    lwz(scratch, MemOperand(location));
+  }
+  // Get the address of the constant and patch it.
+  andi(scratch, scratch, Operand(kImm16Mask));
+  StorePX(new_value, MemOperand(kConstantPoolRegister, scratch));
+#else
+  // This code assumes a FIXED_SEQUENCE for lis/ori
+
+  // At this point scratch is a lis instruction.
+  if (emit_debug_code()) {
+    And(scratch, scratch, Operand(kOpcodeMask | (0x1f * B16)));
+    Cmpi(scratch, Operand(ADDIS), r0);
+    Check(eq, kTheInstructionToPatchShouldBeALis);
+    lwz(scratch, MemOperand(location));
+  }
+
+// insert new high word into lis instruction
+#if V8_TARGET_ARCH_PPC64
+  srdi(ip, new_value, Operand(32));
+  rlwimi(scratch, ip, 16, 16, 31);
+#else
+  rlwimi(scratch, new_value, 16, 16, 31);
+#endif
+
+  stw(scratch, MemOperand(location));
+
+  lwz(scratch, MemOperand(location, kInstrSize));
+  // scratch is now ori.
+  if (emit_debug_code()) {
+    And(scratch, scratch, Operand(kOpcodeMask));
+    Cmpi(scratch, Operand(ORI), r0);
+    Check(eq, kTheInstructionShouldBeAnOri);
+    lwz(scratch, MemOperand(location, kInstrSize));
+  }
+
+// insert new low word into ori instruction
+#if V8_TARGET_ARCH_PPC64
+  rlwimi(scratch, ip, 0, 16, 31);
+#else
+  rlwimi(scratch, new_value, 0, 16, 31);
+#endif
+  stw(scratch, MemOperand(location, kInstrSize));
+
+#if V8_TARGET_ARCH_PPC64
+  if (emit_debug_code()) {
+    lwz(scratch, MemOperand(location, 2 * kInstrSize));
+    // scratch is now sldi.
+    And(scratch, scratch, Operand(kOpcodeMask | kExt5OpcodeMask));
+    Cmpi(scratch, Operand(EXT5 | RLDICR), r0);
+    Check(eq, kTheInstructionShouldBeASldi);
+  }
+
+  lwz(scratch, MemOperand(location, 3 * kInstrSize));
+  // scratch is now ori.
+  if (emit_debug_code()) {
+    And(scratch, scratch, Operand(kOpcodeMask));
+    Cmpi(scratch, Operand(ORIS), r0);
+    Check(eq, kTheInstructionShouldBeAnOris);
+    lwz(scratch, MemOperand(location, 3 * kInstrSize));
+  }
+
+  rlwimi(scratch, new_value, 16, 16, 31);
+  stw(scratch, MemOperand(location, 3 * kInstrSize));
+
+  lwz(scratch, MemOperand(location, 4 * kInstrSize));
+  // scratch is now ori.
+  if (emit_debug_code()) {
+    And(scratch, scratch, Operand(kOpcodeMask));
+    Cmpi(scratch, Operand(ORI), r0);
+    Check(eq, kTheInstructionShouldBeAnOri);
+    lwz(scratch, MemOperand(location, 4 * kInstrSize));
+  }
+  rlwimi(scratch, new_value, 0, 16, 31);
+  stw(scratch, MemOperand(location, 4 * kInstrSize));
+#endif
+
+// Update the I-cache so the new lis and addic can be executed.
+#if V8_TARGET_ARCH_PPC64
+  FlushICache(location, 5 * kInstrSize, scratch);
+#else
+  FlushICache(location, 2 * kInstrSize, scratch);
+#endif
+#endif
+}
+
+
+void MacroAssembler::GetRelocatedValue(Register location, Register result,
+                                       Register scratch) {
+  lwz(result, MemOperand(location));
+
+#if V8_OOL_CONSTANT_POOL
+  if (emit_debug_code()) {
+// Check that the instruction sequence is a load from the constant pool
+#if V8_TARGET_ARCH_PPC64
+    And(result, result, Operand(kOpcodeMask | (0x1f * B16)));
+    Cmpi(result, Operand(ADDI), r0);
+    Check(eq, kTheInstructionShouldBeALi);
+    lwz(result, MemOperand(location, kInstrSize));
+#endif
+    ExtractBitMask(result, result, 0x1f * B16);
+    cmpi(result, Operand(kConstantPoolRegister.code()));
+    Check(eq, kTheInstructionToPatchShouldBeALoadFromConstantPool);
+    lwz(result, MemOperand(location));
+  }
+  // Get the address of the constant and retrieve it.
+  andi(result, result, Operand(kImm16Mask));
+  LoadPX(result, MemOperand(kConstantPoolRegister, result));
+#else
+  // This code assumes a FIXED_SEQUENCE for lis/ori
+  if (emit_debug_code()) {
+    And(result, result, Operand(kOpcodeMask | (0x1f * B16)));
+    Cmpi(result, Operand(ADDIS), r0);
+    Check(eq, kTheInstructionShouldBeALis);
+    lwz(result, MemOperand(location));
+  }
+
+  // result now holds a lis instruction. Extract the immediate.
+  slwi(result, result, Operand(16));
+
+  lwz(scratch, MemOperand(location, kInstrSize));
+  if (emit_debug_code()) {
+    And(scratch, scratch, Operand(kOpcodeMask));
+    Cmpi(scratch, Operand(ORI), r0);
+    Check(eq, kTheInstructionShouldBeAnOri);
+    lwz(scratch, MemOperand(location, kInstrSize));
+  }
+  // Copy the low 16bits from ori instruction into result
+  rlwimi(result, scratch, 0, 16, 31);
+
+#if V8_TARGET_ARCH_PPC64
+  if (emit_debug_code()) {
+    lwz(scratch, MemOperand(location, 2 * kInstrSize));
+    // scratch is now sldi.
+    And(scratch, scratch, Operand(kOpcodeMask | kExt5OpcodeMask));
+    Cmpi(scratch, Operand(EXT5 | RLDICR), r0);
+    Check(eq, kTheInstructionShouldBeASldi);
+  }
+
+  lwz(scratch, MemOperand(location, 3 * kInstrSize));
+  // scratch is now ori.
+  if (emit_debug_code()) {
+    And(scratch, scratch, Operand(kOpcodeMask));
+    Cmpi(scratch, Operand(ORIS), r0);
+    Check(eq, kTheInstructionShouldBeAnOris);
+    lwz(scratch, MemOperand(location, 3 * kInstrSize));
+  }
+  sldi(result, result, Operand(16));
+  rldimi(result, scratch, 0, 48);
+
+  lwz(scratch, MemOperand(location, 4 * kInstrSize));
+  // scratch is now ori.
+  if (emit_debug_code()) {
+    And(scratch, scratch, Operand(kOpcodeMask));
+    Cmpi(scratch, Operand(ORI), r0);
+    Check(eq, kTheInstructionShouldBeAnOri);
+    lwz(scratch, MemOperand(location, 4 * kInstrSize));
+  }
+  sldi(result, result, Operand(16));
+  rldimi(result, scratch, 0, 48);
+#endif
+#endif
+}
+
+
+void MacroAssembler::CheckPageFlag(
+    Register object,
+    Register scratch,  // scratch may be same register as object
+    int mask, Condition cc, Label* condition_met) {
+  DCHECK(cc == ne || cc == eq);
+  ClearRightImm(scratch, object, Operand(kPageSizeBits));
+  LoadP(scratch, MemOperand(scratch, MemoryChunk::kFlagsOffset));
+
+  And(r0, scratch, Operand(mask), SetRC);
+
+  if (cc == ne) {
+    bne(condition_met, cr0);
+  }
+  if (cc == eq) {
+    beq(condition_met, cr0);
+  }
+}
+
+
+void MacroAssembler::CheckMapDeprecated(Handle<Map> map, Register scratch,
+                                        Label* if_deprecated) {
+  if (map->CanBeDeprecated()) {
+    mov(scratch, Operand(map));
+    lwz(scratch, FieldMemOperand(scratch, Map::kBitField3Offset));
+    ExtractBitMask(scratch, scratch, Map::Deprecated::kMask, SetRC);
+    bne(if_deprecated, cr0);
+  }
+}
+
+
+void MacroAssembler::JumpIfBlack(Register object, Register scratch0,
+                                 Register scratch1, Label* on_black) {
+  HasColor(object, scratch0, scratch1, on_black, 1, 0);  // kBlackBitPattern.
+  DCHECK(strcmp(Marking::kBlackBitPattern, "10") == 0);
+}
+
+
+void MacroAssembler::HasColor(Register object, Register bitmap_scratch,
+                              Register mask_scratch, Label* has_color,
+                              int first_bit, int second_bit) {
+  DCHECK(!AreAliased(object, bitmap_scratch, mask_scratch, no_reg));
+
+  GetMarkBits(object, bitmap_scratch, mask_scratch);
+
+  Label other_color, word_boundary;
+  lwz(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
+  // Test the first bit
+  and_(r0, ip, mask_scratch, SetRC);
+  b(first_bit == 1 ? eq : ne, &other_color, cr0);
+  // Shift left 1
+  // May need to load the next cell
+  slwi(mask_scratch, mask_scratch, Operand(1), SetRC);
+  beq(&word_boundary, cr0);
+  // Test the second bit
+  and_(r0, ip, mask_scratch, SetRC);
+  b(second_bit == 1 ? ne : eq, has_color, cr0);
+  b(&other_color);
+
+  bind(&word_boundary);
+  lwz(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize + kIntSize));
+  andi(r0, ip, Operand(1));
+  b(second_bit == 1 ? ne : eq, has_color, cr0);
+  bind(&other_color);
+}
+
+
+// Detect some, but not all, common pointer-free objects.  This is used by the
+// incremental write barrier which doesn't care about oddballs (they are always
+// marked black immediately so this code is not hit).
+void MacroAssembler::JumpIfDataObject(Register value, Register scratch,
+                                      Label* not_data_object) {
+  Label is_data_object;
+  LoadP(scratch, FieldMemOperand(value, HeapObject::kMapOffset));
+  CompareRoot(scratch, Heap::kHeapNumberMapRootIndex);
+  beq(&is_data_object);
+  DCHECK(kIsIndirectStringTag == 1 && kIsIndirectStringMask == 1);
+  DCHECK(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.
+  lbz(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
+  STATIC_ASSERT((kIsIndirectStringMask | kIsNotStringMask) == 0x81);
+  andi(scratch, scratch, Operand(kIsIndirectStringMask | kIsNotStringMask));
+  bne(not_data_object, cr0);
+  bind(&is_data_object);
+}
+
+
+void MacroAssembler::GetMarkBits(Register addr_reg, Register bitmap_reg,
+                                 Register mask_reg) {
+  DCHECK(!AreAliased(addr_reg, bitmap_reg, mask_reg, no_reg));
+  DCHECK((~Page::kPageAlignmentMask & 0xffff) == 0);
+  lis(r0, Operand((~Page::kPageAlignmentMask >> 16)));
+  and_(bitmap_reg, addr_reg, r0);
+  const int kLowBits = kPointerSizeLog2 + Bitmap::kBitsPerCellLog2;
+  ExtractBitRange(mask_reg, addr_reg, kLowBits - 1, kPointerSizeLog2);
+  ExtractBitRange(ip, addr_reg, kPageSizeBits - 1, kLowBits);
+  ShiftLeftImm(ip, ip, Operand(Bitmap::kBytesPerCellLog2));
+  add(bitmap_reg, bitmap_reg, ip);
+  li(ip, Operand(1));
+  slw(mask_reg, ip, mask_reg);
+}
+
+
+void MacroAssembler::EnsureNotWhite(Register value, Register bitmap_scratch,
+                                    Register mask_scratch,
+                                    Register load_scratch,
+                                    Label* value_is_white_and_not_data) {
+  DCHECK(!AreAliased(value, bitmap_scratch, mask_scratch, ip));
+  GetMarkBits(value, bitmap_scratch, mask_scratch);
+
+  // If the value is black or grey we don't need to do anything.
+  DCHECK(strcmp(Marking::kWhiteBitPattern, "00") == 0);
+  DCHECK(strcmp(Marking::kBlackBitPattern, "10") == 0);
+  DCHECK(strcmp(Marking::kGreyBitPattern, "11") == 0);
+  DCHECK(strcmp(Marking::kImpossibleBitPattern, "01") == 0);
+
+  Label done;
+
+  // 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.
+  lwz(load_scratch, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
+  and_(r0, mask_scratch, load_scratch, SetRC);
+  bne(&done, cr0);
+
+  if (emit_debug_code()) {
+    // Check for impossible bit pattern.
+    Label ok;
+    // LSL may overflow, making the check conservative.
+    slwi(r0, mask_scratch, Operand(1));
+    and_(r0, load_scratch, r0, SetRC);
+    beq(&ok, cr0);
+    stop("Impossible marking bit pattern");
+    bind(&ok);
+  }
+
+  // Value is white.  We check whether it is data that doesn't need scanning.
+  // Currently only checks for HeapNumber and non-cons strings.
+  Register map = load_scratch;     // Holds map while checking type.
+  Register length = load_scratch;  // Holds length of object after testing type.
+  Label is_data_object, maybe_string_object, is_string_object, is_encoded;
+#if V8_TARGET_ARCH_PPC64
+  Label length_computed;
+#endif
+
+
+  // Check for heap-number
+  LoadP(map, FieldMemOperand(value, HeapObject::kMapOffset));
+  CompareRoot(map, Heap::kHeapNumberMapRootIndex);
+  bne(&maybe_string_object);
+  li(length, Operand(HeapNumber::kSize));
+  b(&is_data_object);
+  bind(&maybe_string_object);
+
+  // Check for strings.
+  DCHECK(kIsIndirectStringTag == 1 && kIsIndirectStringMask == 1);
+  DCHECK(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;
+  lbz(instance_type, FieldMemOperand(map, Map::kInstanceTypeOffset));
+  andi(r0, instance_type, Operand(kIsIndirectStringMask | kIsNotStringMask));
+  bne(value_is_white_and_not_data, cr0);
+  // 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.
+  DCHECK_EQ(0, kSeqStringTag & kExternalStringTag);
+  DCHECK_EQ(0, kConsStringTag & kExternalStringTag);
+  andi(r0, instance_type, Operand(kExternalStringTag));
+  beq(&is_string_object, cr0);
+  li(length, Operand(ExternalString::kSize));
+  b(&is_data_object);
+  bind(&is_string_object);
+
+  // Sequential string, either ASCII or UC16.
+  // For ASCII (char-size of 1) we untag the smi to get the length.
+  // For UC16 (char-size of 2):
+  //   - (32-bit) we just leave the smi tag in place, thereby getting
+  //              the length multiplied by 2.
+  //   - (64-bit) we compute the offset in the 2-byte array
+  DCHECK(kOneByteStringTag == 4 && kStringEncodingMask == 4);
+  LoadP(ip, FieldMemOperand(value, String::kLengthOffset));
+  andi(r0, instance_type, Operand(kStringEncodingMask));
+  beq(&is_encoded, cr0);
+  SmiUntag(ip);
+#if V8_TARGET_ARCH_PPC64
+  b(&length_computed);
+#endif
+  bind(&is_encoded);
+#if V8_TARGET_ARCH_PPC64
+  SmiToShortArrayOffset(ip, ip);
+  bind(&length_computed);
+#else
+  DCHECK(kSmiShift == 1);
+#endif
+  addi(length, ip, Operand(SeqString::kHeaderSize + kObjectAlignmentMask));
+  li(r0, Operand(~kObjectAlignmentMask));
+  and_(length, length, r0);
+
+  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.
+  lwz(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
+  orx(ip, ip, mask_scratch);
+  stw(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
+
+  mov(ip, Operand(~Page::kPageAlignmentMask));
+  and_(bitmap_scratch, bitmap_scratch, ip);
+  lwz(ip, MemOperand(bitmap_scratch, MemoryChunk::kLiveBytesOffset));
+  add(ip, ip, length);
+  stw(ip, MemOperand(bitmap_scratch, MemoryChunk::kLiveBytesOffset));
+
+  bind(&done);
+}
+
+
+// Saturate a value into 8-bit unsigned integer
+//   if input_value < 0, output_value is 0
+//   if input_value > 255, output_value is 255
+//   otherwise output_value is the input_value
+void MacroAssembler::ClampUint8(Register output_reg, Register input_reg) {
+  Label done, negative_label, overflow_label;
+  int satval = (1 << 8) - 1;
+
+  cmpi(input_reg, Operand::Zero());
+  blt(&negative_label);
+
+  cmpi(input_reg, Operand(satval));
+  bgt(&overflow_label);
+  if (!output_reg.is(input_reg)) {
+    mr(output_reg, input_reg);
+  }
+  b(&done);
+
+  bind(&negative_label);
+  li(output_reg, Operand::Zero());  // set to 0 if negative
+  b(&done);
+
+
+  bind(&overflow_label);  // set to satval if > satval
+  li(output_reg, Operand(satval));
+
+  bind(&done);
+}
+
+
+void MacroAssembler::SetRoundingMode(FPRoundingMode RN) { mtfsfi(7, RN); }
+
+
+void MacroAssembler::ResetRoundingMode() {
+  mtfsfi(7, kRoundToNearest);  // reset (default is kRoundToNearest)
+}
+
+
+void MacroAssembler::ClampDoubleToUint8(Register result_reg,
+                                        DoubleRegister input_reg,
+                                        DoubleRegister double_scratch) {
+  Label above_zero;
+  Label done;
+  Label in_bounds;
+
+  LoadDoubleLiteral(double_scratch, 0.0, result_reg);
+  fcmpu(input_reg, double_scratch);
+  bgt(&above_zero);
+
+  // Double value is less than zero, NaN or Inf, return 0.
+  LoadIntLiteral(result_reg, 0);
+  b(&done);
+
+  // Double value is >= 255, return 255.
+  bind(&above_zero);
+  LoadDoubleLiteral(double_scratch, 255.0, result_reg);
+  fcmpu(input_reg, double_scratch);
+  ble(&in_bounds);
+  LoadIntLiteral(result_reg, 255);
+  b(&done);
+
+  // In 0-255 range, round and truncate.
+  bind(&in_bounds);
+
+  // round to nearest (default rounding mode)
+  fctiw(double_scratch, input_reg);
+  MovDoubleLowToInt(result_reg, double_scratch);
+  bind(&done);
+}
+
+
+void MacroAssembler::LoadInstanceDescriptors(Register map,
+                                             Register descriptors) {
+  LoadP(descriptors, FieldMemOperand(map, Map::kDescriptorsOffset));
+}
+
+
+void MacroAssembler::NumberOfOwnDescriptors(Register dst, Register map) {
+  lwz(dst, FieldMemOperand(map, Map::kBitField3Offset));
+  DecodeField<Map::NumberOfOwnDescriptorsBits>(dst);
+}
+
+
+void MacroAssembler::EnumLength(Register dst, Register map) {
+  STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
+  lwz(dst, FieldMemOperand(map, Map::kBitField3Offset));
+  ExtractBitMask(dst, dst, Map::EnumLengthBits::kMask);
+  SmiTag(dst);
+}
+
+
+void MacroAssembler::CheckEnumCache(Register null_value, Label* call_runtime) {
+  Register empty_fixed_array_value = r9;
+  LoadRoot(empty_fixed_array_value, Heap::kEmptyFixedArrayRootIndex);
+  Label next, start;
+  mr(r5, r3);
+
+  // Check if the enum length field is properly initialized, indicating that
+  // there is an enum cache.
+  LoadP(r4, FieldMemOperand(r5, HeapObject::kMapOffset));
+
+  EnumLength(r6, r4);
+  CmpSmiLiteral(r6, Smi::FromInt(kInvalidEnumCacheSentinel), r0);
+  beq(call_runtime);
+
+  b(&start);
+
+  bind(&next);
+  LoadP(r4, FieldMemOperand(r5, HeapObject::kMapOffset));
+
+  // For all objects but the receiver, check that the cache is empty.
+  EnumLength(r6, r4);
+  CmpSmiLiteral(r6, Smi::FromInt(0), r0);
+  bne(call_runtime);
+
+  bind(&start);
+
+  // Check that there are no elements. Register r5 contains the current JS
+  // object we've reached through the prototype chain.
+  Label no_elements;
+  LoadP(r5, FieldMemOperand(r5, JSObject::kElementsOffset));
+  cmp(r5, empty_fixed_array_value);
+  beq(&no_elements);
+
+  // Second chance, the object may be using the empty slow element dictionary.
+  CompareRoot(r5, Heap::kEmptySlowElementDictionaryRootIndex);
+  bne(call_runtime);
+
+  bind(&no_elements);
+  LoadP(r5, FieldMemOperand(r4, Map::kPrototypeOffset));
+  cmp(r5, null_value);
+  bne(&next);
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// New MacroAssembler Interfaces added for PPC
+//
+////////////////////////////////////////////////////////////////////////////////
+void MacroAssembler::LoadIntLiteral(Register dst, int value) {
+  mov(dst, Operand(value));
+}
+
+
+void MacroAssembler::LoadSmiLiteral(Register dst, Smi* smi) {
+  mov(dst, Operand(smi));
+}
+
+
+void MacroAssembler::LoadDoubleLiteral(DoubleRegister result, double value,
+                                       Register scratch) {
+#if V8_OOL_CONSTANT_POOL
+  // TODO(mbrandy): enable extended constant pool usage for doubles.
+  //                See ARM commit e27ab337 for a reference.
+  if (is_constant_pool_available() && !is_constant_pool_full()) {
+    RelocInfo rinfo(pc_, value);
+    ConstantPoolAddEntry(rinfo);
+#if V8_TARGET_ARCH_PPC64
+    // We use 2 instruction sequence here for consistency with mov.
+    li(scratch, Operand::Zero());
+    lfdx(result, MemOperand(kConstantPoolRegister, scratch));
+#else
+    lfd(result, MemOperand(kConstantPoolRegister, 0));
+#endif
+    return;
+  }
+#endif
+
+  // avoid gcc strict aliasing error using union cast
+  union {
+    double dval;
+#if V8_TARGET_ARCH_PPC64
+    intptr_t ival;
+#else
+    intptr_t ival[2];
+#endif
+  } litVal;
+
+  litVal.dval = value;
+
+#if V8_TARGET_ARCH_PPC64
+  if (CpuFeatures::IsSupported(FPR_GPR_MOV)) {
+    mov(scratch, Operand(litVal.ival));
+    mtfprd(result, scratch);
+    return;
+  }
+#endif
+
+  addi(sp, sp, Operand(-kDoubleSize));
+#if V8_TARGET_ARCH_PPC64
+  mov(scratch, Operand(litVal.ival));
+  std(scratch, MemOperand(sp));
+#else
+  LoadIntLiteral(scratch, litVal.ival[0]);
+  stw(scratch, MemOperand(sp, 0));
+  LoadIntLiteral(scratch, litVal.ival[1]);
+  stw(scratch, MemOperand(sp, 4));
+#endif
+  nop();  // LHS/RAW optimization
+  lfd(result, MemOperand(sp, 0));
+  addi(sp, sp, Operand(kDoubleSize));
+}
+
+
+void MacroAssembler::MovIntToDouble(DoubleRegister dst, Register src,
+                                    Register scratch) {
+// sign-extend src to 64-bit
+#if V8_TARGET_ARCH_PPC64
+  if (CpuFeatures::IsSupported(FPR_GPR_MOV)) {
+    mtfprwa(dst, src);
+    return;
+  }
+#endif
+
+  DCHECK(!src.is(scratch));
+  subi(sp, sp, Operand(kDoubleSize));
+#if V8_TARGET_ARCH_PPC64
+  extsw(scratch, src);
+  std(scratch, MemOperand(sp, 0));
+#else
+  srawi(scratch, src, 31);
+  stw(scratch, MemOperand(sp, Register::kExponentOffset));
+  stw(src, MemOperand(sp, Register::kMantissaOffset));
+#endif
+  nop();  // LHS/RAW optimization
+  lfd(dst, MemOperand(sp, 0));
+  addi(sp, sp, Operand(kDoubleSize));
+}
+
+
+void MacroAssembler::MovUnsignedIntToDouble(DoubleRegister dst, Register src,
+                                            Register scratch) {
+// zero-extend src to 64-bit
+#if V8_TARGET_ARCH_PPC64
+  if (CpuFeatures::IsSupported(FPR_GPR_MOV)) {
+    mtfprwz(dst, src);
+    return;
+  }
+#endif
+
+  DCHECK(!src.is(scratch));
+  subi(sp, sp, Operand(kDoubleSize));
+#if V8_TARGET_ARCH_PPC64
+  clrldi(scratch, src, Operand(32));
+  std(scratch, MemOperand(sp, 0));
+#else
+  li(scratch, Operand::Zero());
+  stw(scratch, MemOperand(sp, Register::kExponentOffset));
+  stw(src, MemOperand(sp, Register::kMantissaOffset));
+#endif
+  nop();  // LHS/RAW optimization
+  lfd(dst, MemOperand(sp, 0));
+  addi(sp, sp, Operand(kDoubleSize));
+}
+
+
+void MacroAssembler::MovInt64ToDouble(DoubleRegister dst,
+#if !V8_TARGET_ARCH_PPC64
+                                      Register src_hi,
+#endif
+                                      Register src) {
+#if V8_TARGET_ARCH_PPC64
+  if (CpuFeatures::IsSupported(FPR_GPR_MOV)) {
+    mtfprd(dst, src);
+    return;
+  }
+#endif
+
+  subi(sp, sp, Operand(kDoubleSize));
+#if V8_TARGET_ARCH_PPC64
+  std(src, MemOperand(sp, 0));
+#else
+  stw(src_hi, MemOperand(sp, Register::kExponentOffset));
+  stw(src, MemOperand(sp, Register::kMantissaOffset));
+#endif
+  nop();  // LHS/RAW optimization
+  lfd(dst, MemOperand(sp, 0));
+  addi(sp, sp, Operand(kDoubleSize));
+}
+
+
+#if V8_TARGET_ARCH_PPC64
+void MacroAssembler::MovInt64ComponentsToDouble(DoubleRegister dst,
+                                                Register src_hi,
+                                                Register src_lo,
+                                                Register scratch) {
+  if (CpuFeatures::IsSupported(FPR_GPR_MOV)) {
+    sldi(scratch, src_hi, Operand(32));
+    rldimi(scratch, src_lo, 0, 32);
+    mtfprd(dst, scratch);
+    return;
+  }
+
+  subi(sp, sp, Operand(kDoubleSize));
+  stw(src_hi, MemOperand(sp, Register::kExponentOffset));
+  stw(src_lo, MemOperand(sp, Register::kMantissaOffset));
+  nop();  // LHS/RAW optimization
+  lfd(dst, MemOperand(sp));
+  addi(sp, sp, Operand(kDoubleSize));
+}
+#endif
+
+
+void MacroAssembler::MovDoubleLowToInt(Register dst, DoubleRegister src) {
+#if V8_TARGET_ARCH_PPC64
+  if (CpuFeatures::IsSupported(FPR_GPR_MOV)) {
+    mffprwz(dst, src);
+    return;
+  }
+#endif
+
+  subi(sp, sp, Operand(kDoubleSize));
+  stfd(src, MemOperand(sp));
+  nop();  // LHS/RAW optimization
+  lwz(dst, MemOperand(sp, Register::kMantissaOffset));
+  addi(sp, sp, Operand(kDoubleSize));
+}
+
+
+void MacroAssembler::MovDoubleHighToInt(Register dst, DoubleRegister src) {
+#if V8_TARGET_ARCH_PPC64
+  if (CpuFeatures::IsSupported(FPR_GPR_MOV)) {
+    mffprd(dst, src);
+    srdi(dst, dst, Operand(32));
+    return;
+  }
+#endif
+
+  subi(sp, sp, Operand(kDoubleSize));
+  stfd(src, MemOperand(sp));
+  nop();  // LHS/RAW optimization
+  lwz(dst, MemOperand(sp, Register::kExponentOffset));
+  addi(sp, sp, Operand(kDoubleSize));
+}
+
+
+void MacroAssembler::MovDoubleToInt64(
+#if !V8_TARGET_ARCH_PPC64
+    Register dst_hi,
+#endif
+    Register dst, DoubleRegister src) {
+#if V8_TARGET_ARCH_PPC64
+  if (CpuFeatures::IsSupported(FPR_GPR_MOV)) {
+    mffprd(dst, src);
+    return;
+  }
+#endif
+
+  subi(sp, sp, Operand(kDoubleSize));
+  stfd(src, MemOperand(sp));
+  nop();  // LHS/RAW optimization
+#if V8_TARGET_ARCH_PPC64
+  ld(dst, MemOperand(sp, 0));
+#else
+  lwz(dst_hi, MemOperand(sp, Register::kExponentOffset));
+  lwz(dst, MemOperand(sp, Register::kMantissaOffset));
+#endif
+  addi(sp, sp, Operand(kDoubleSize));
+}
+
+
+void MacroAssembler::Add(Register dst, Register src, intptr_t value,
+                         Register scratch) {
+  if (is_int16(value)) {
+    addi(dst, src, Operand(value));
+  } else {
+    mov(scratch, Operand(value));
+    add(dst, src, scratch);
+  }
+}
+
+
+void MacroAssembler::Cmpi(Register src1, const Operand& src2, Register scratch,
+                          CRegister cr) {
+  intptr_t value = src2.immediate();
+  if (is_int16(value)) {
+    cmpi(src1, src2, cr);
+  } else {
+    mov(scratch, src2);
+    cmp(src1, scratch, cr);
+  }
+}
+
+
+void MacroAssembler::Cmpli(Register src1, const Operand& src2, Register scratch,
+                           CRegister cr) {
+  intptr_t value = src2.immediate();
+  if (is_uint16(value)) {
+    cmpli(src1, src2, cr);
+  } else {
+    mov(scratch, src2);
+    cmpl(src1, scratch, cr);
+  }
+}
+
+
+void MacroAssembler::Cmpwi(Register src1, const Operand& src2, Register scratch,
+                           CRegister cr) {
+  intptr_t value = src2.immediate();
+  if (is_int16(value)) {
+    cmpwi(src1, src2, cr);
+  } else {
+    mov(scratch, src2);
+    cmpw(src1, scratch, cr);
+  }
+}
+
+
+void MacroAssembler::Cmplwi(Register src1, const Operand& src2,
+                            Register scratch, CRegister cr) {
+  intptr_t value = src2.immediate();
+  if (is_uint16(value)) {
+    cmplwi(src1, src2, cr);
+  } else {
+    mov(scratch, src2);
+    cmplw(src1, scratch, cr);
+  }
+}
+
+
+void MacroAssembler::And(Register ra, Register rs, const Operand& rb,
+                         RCBit rc) {
+  if (rb.is_reg()) {
+    and_(ra, rs, rb.rm(), rc);
+  } else {
+    if (is_uint16(rb.imm_) && RelocInfo::IsNone(rb.rmode_) && rc == SetRC) {
+      andi(ra, rs, rb);
+    } else {
+      // mov handles the relocation.
+      DCHECK(!rs.is(r0));
+      mov(r0, rb);
+      and_(ra, rs, r0, rc);
+    }
+  }
+}
+
+
+void MacroAssembler::Or(Register ra, Register rs, const Operand& rb, RCBit rc) {
+  if (rb.is_reg()) {
+    orx(ra, rs, rb.rm(), rc);
+  } else {
+    if (is_uint16(rb.imm_) && RelocInfo::IsNone(rb.rmode_) && rc == LeaveRC) {
+      ori(ra, rs, rb);
+    } else {
+      // mov handles the relocation.
+      DCHECK(!rs.is(r0));
+      mov(r0, rb);
+      orx(ra, rs, r0, rc);
+    }
+  }
+}
+
+
+void MacroAssembler::Xor(Register ra, Register rs, const Operand& rb,
+                         RCBit rc) {
+  if (rb.is_reg()) {
+    xor_(ra, rs, rb.rm(), rc);
+  } else {
+    if (is_uint16(rb.imm_) && RelocInfo::IsNone(rb.rmode_) && rc == LeaveRC) {
+      xori(ra, rs, rb);
+    } else {
+      // mov handles the relocation.
+      DCHECK(!rs.is(r0));
+      mov(r0, rb);
+      xor_(ra, rs, r0, rc);
+    }
+  }
+}
+
+
+void MacroAssembler::CmpSmiLiteral(Register src1, Smi* smi, Register scratch,
+                                   CRegister cr) {
+#if V8_TARGET_ARCH_PPC64
+  LoadSmiLiteral(scratch, smi);
+  cmp(src1, scratch, cr);
+#else
+  Cmpi(src1, Operand(smi), scratch, cr);
+#endif
+}
+
+
+void MacroAssembler::CmplSmiLiteral(Register src1, Smi* smi, Register scratch,
+                                    CRegister cr) {
+#if V8_TARGET_ARCH_PPC64
+  LoadSmiLiteral(scratch, smi);
+  cmpl(src1, scratch, cr);
+#else
+  Cmpli(src1, Operand(smi), scratch, cr);
+#endif
+}
+
+
+void MacroAssembler::AddSmiLiteral(Register dst, Register src, Smi* smi,
+                                   Register scratch) {
+#if V8_TARGET_ARCH_PPC64
+  LoadSmiLiteral(scratch, smi);
+  add(dst, src, scratch);
+#else
+  Add(dst, src, reinterpret_cast<intptr_t>(smi), scratch);
+#endif
+}
+
+
+void MacroAssembler::SubSmiLiteral(Register dst, Register src, Smi* smi,
+                                   Register scratch) {
+#if V8_TARGET_ARCH_PPC64
+  LoadSmiLiteral(scratch, smi);
+  sub(dst, src, scratch);
+#else
+  Add(dst, src, -(reinterpret_cast<intptr_t>(smi)), scratch);
+#endif
+}
+
+
+void MacroAssembler::AndSmiLiteral(Register dst, Register src, Smi* smi,
+                                   Register scratch, RCBit rc) {
+#if V8_TARGET_ARCH_PPC64
+  LoadSmiLiteral(scratch, smi);
+  and_(dst, src, scratch, rc);
+#else
+  And(dst, src, Operand(smi), rc);
+#endif
+}
+
+
+// Load a "pointer" sized value from the memory location
+void MacroAssembler::LoadP(Register dst, const MemOperand& mem,
+                           Register scratch) {
+  int offset = mem.offset();
+
+  if (!scratch.is(no_reg) && !is_int16(offset)) {
+    /* cannot use d-form */
+    LoadIntLiteral(scratch, offset);
+#if V8_TARGET_ARCH_PPC64
+    ldx(dst, MemOperand(mem.ra(), scratch));
+#else
+    lwzx(dst, MemOperand(mem.ra(), scratch));
+#endif
+  } else {
+#if V8_TARGET_ARCH_PPC64
+    int misaligned = (offset & 3);
+    if (misaligned) {
+      // adjust base to conform to offset alignment requirements
+      // Todo: enhance to use scratch if dst is unsuitable
+      DCHECK(!dst.is(r0));
+      addi(dst, mem.ra(), Operand((offset & 3) - 4));
+      ld(dst, MemOperand(dst, (offset & ~3) + 4));
+    } else {
+      ld(dst, mem);
+    }
+#else
+    lwz(dst, mem);
+#endif
+  }
+}
+
+
+// Store a "pointer" sized value to the memory location
+void MacroAssembler::StoreP(Register src, const MemOperand& mem,
+                            Register scratch) {
+  int offset = mem.offset();
+
+  if (!scratch.is(no_reg) && !is_int16(offset)) {
+    /* cannot use d-form */
+    LoadIntLiteral(scratch, offset);
+#if V8_TARGET_ARCH_PPC64
+    stdx(src, MemOperand(mem.ra(), scratch));
+#else
+    stwx(src, MemOperand(mem.ra(), scratch));
+#endif
+  } else {
+#if V8_TARGET_ARCH_PPC64
+    int misaligned = (offset & 3);
+    if (misaligned) {
+      // adjust base to conform to offset alignment requirements
+      // a suitable scratch is required here
+      DCHECK(!scratch.is(no_reg));
+      if (scratch.is(r0)) {
+        LoadIntLiteral(scratch, offset);
+        stdx(src, MemOperand(mem.ra(), scratch));
+      } else {
+        addi(scratch, mem.ra(), Operand((offset & 3) - 4));
+        std(src, MemOperand(scratch, (offset & ~3) + 4));
+      }
+    } else {
+      std(src, mem);
+    }
+#else
+    stw(src, mem);
+#endif
+  }
+}
+
+void MacroAssembler::LoadWordArith(Register dst, const MemOperand& mem,
+                                   Register scratch) {
+  int offset = mem.offset();
+
+  if (!scratch.is(no_reg) && !is_int16(offset)) {
+    /* cannot use d-form */
+    LoadIntLiteral(scratch, offset);
+#if V8_TARGET_ARCH_PPC64
+    // lwax(dst, MemOperand(mem.ra(), scratch));
+    DCHECK(0);  // lwax not yet implemented
+#else
+    lwzx(dst, MemOperand(mem.ra(), scratch));
+#endif
+  } else {
+#if V8_TARGET_ARCH_PPC64
+    int misaligned = (offset & 3);
+    if (misaligned) {
+      // adjust base to conform to offset alignment requirements
+      // Todo: enhance to use scratch if dst is unsuitable
+      DCHECK(!dst.is(r0));
+      addi(dst, mem.ra(), Operand((offset & 3) - 4));
+      lwa(dst, MemOperand(dst, (offset & ~3) + 4));
+    } else {
+      lwa(dst, mem);
+    }
+#else
+    lwz(dst, mem);
+#endif
+  }
+}
+
+
+// Variable length depending on whether offset fits into immediate field
+// MemOperand currently only supports d-form
+void MacroAssembler::LoadWord(Register dst, const MemOperand& mem,
+                              Register scratch, bool updateForm) {
+  Register base = mem.ra();
+  int offset = mem.offset();
+
+  bool use_dform = true;
+  if (!is_int16(offset)) {
+    use_dform = false;
+    LoadIntLiteral(scratch, offset);
+  }
+
+  if (!updateForm) {
+    if (use_dform) {
+      lwz(dst, mem);
+    } else {
+      lwzx(dst, MemOperand(base, scratch));
+    }
+  } else {
+    if (use_dform) {
+      lwzu(dst, mem);
+    } else {
+      lwzux(dst, MemOperand(base, scratch));
+    }
+  }
+}
+
+
+// Variable length depending on whether offset fits into immediate field
+// MemOperand current only supports d-form
+void MacroAssembler::StoreWord(Register src, const MemOperand& mem,
+                               Register scratch, bool updateForm) {
+  Register base = mem.ra();
+  int offset = mem.offset();
+
+  bool use_dform = true;
+  if (!is_int16(offset)) {
+    use_dform = false;
+    LoadIntLiteral(scratch, offset);
+  }
+
+  if (!updateForm) {
+    if (use_dform) {
+      stw(src, mem);
+    } else {
+      stwx(src, MemOperand(base, scratch));
+    }
+  } else {
+    if (use_dform) {
+      stwu(src, mem);
+    } else {
+      stwux(src, MemOperand(base, scratch));
+    }
+  }
+}
+
+
+// Variable length depending on whether offset fits into immediate field
+// MemOperand currently only supports d-form
+void MacroAssembler::LoadHalfWord(Register dst, const MemOperand& mem,
+                                  Register scratch, bool updateForm) {
+  Register base = mem.ra();
+  int offset = mem.offset();
+
+  bool use_dform = true;
+  if (!is_int16(offset)) {
+    use_dform = false;
+    LoadIntLiteral(scratch, offset);
+  }
+
+  if (!updateForm) {
+    if (use_dform) {
+      lhz(dst, mem);
+    } else {
+      lhzx(dst, MemOperand(base, scratch));
+    }
+  } else {
+    // If updateForm is ever true, then lhzu will
+    // need to be implemented
+    assert(0);
+#if 0  // LoadHalfWord w\ update not yet needed
+    if (use_dform) {
+      lhzu(dst, mem);
+    } else {
+      lhzux(dst, MemOperand(base, scratch));
+    }
+#endif
+  }
+}
+
+
+// Variable length depending on whether offset fits into immediate field
+// MemOperand current only supports d-form
+void MacroAssembler::StoreHalfWord(Register src, const MemOperand& mem,
+                                   Register scratch, bool updateForm) {
+  Register base = mem.ra();
+  int offset = mem.offset();
+
+  bool use_dform = true;
+  if (!is_int16(offset)) {
+    use_dform = false;
+    LoadIntLiteral(scratch, offset);
+  }
+
+  if (!updateForm) {
+    if (use_dform) {
+      sth(src, mem);
+    } else {
+      sthx(src, MemOperand(base, scratch));
+    }
+  } else {
+    // If updateForm is ever true, then sthu will
+    // need to be implemented
+    assert(0);
+#if 0  // StoreHalfWord w\ update not yet needed
+    if (use_dform) {
+      sthu(src, mem);
+    } else {
+      sthux(src, MemOperand(base, scratch));
+    }
+#endif
+  }
+}
+
+
+// Variable length depending on whether offset fits into immediate field
+// MemOperand currently only supports d-form
+void MacroAssembler::LoadByte(Register dst, const MemOperand& mem,
+                              Register scratch, bool updateForm) {
+  Register base = mem.ra();
+  int offset = mem.offset();
+
+  bool use_dform = true;
+  if (!is_int16(offset)) {
+    use_dform = false;
+    LoadIntLiteral(scratch, offset);
+  }
+
+  if (!updateForm) {
+    if (use_dform) {
+      lbz(dst, mem);
+    } else {
+      lbzx(dst, MemOperand(base, scratch));
+    }
+  } else {
+    // If updateForm is ever true, then lbzu will
+    // need to be implemented
+    assert(0);
+#if 0  // LoadByte w\ update not yet needed
+    if (use_dform) {
+      lbzu(dst, mem);
+    } else {
+      lbzux(dst, MemOperand(base, scratch));
+    }
+#endif
+  }
+}
+
+
+// Variable length depending on whether offset fits into immediate field
+// MemOperand current only supports d-form
+void MacroAssembler::StoreByte(Register src, const MemOperand& mem,
+                               Register scratch, bool updateForm) {
+  Register base = mem.ra();
+  int offset = mem.offset();
+
+  bool use_dform = true;
+  if (!is_int16(offset)) {
+    use_dform = false;
+    LoadIntLiteral(scratch, offset);
+  }
+
+  if (!updateForm) {
+    if (use_dform) {
+      stb(src, mem);
+    } else {
+      stbx(src, MemOperand(base, scratch));
+    }
+  } else {
+    // If updateForm is ever true, then stbu will
+    // need to be implemented
+    assert(0);
+#if 0  // StoreByte w\ update not yet needed
+    if (use_dform) {
+      stbu(src, mem);
+    } else {
+      stbux(src, MemOperand(base, scratch));
+    }
+#endif
+  }
+}
+
+
+void MacroAssembler::LoadRepresentation(Register dst, const MemOperand& mem,
+                                        Representation r, Register scratch) {
+  DCHECK(!r.IsDouble());
+  if (r.IsInteger8()) {
+    LoadByte(dst, mem, scratch);
+    extsb(dst, dst);
+  } else if (r.IsUInteger8()) {
+    LoadByte(dst, mem, scratch);
+  } else if (r.IsInteger16()) {
+    LoadHalfWord(dst, mem, scratch);
+    extsh(dst, dst);
+  } else if (r.IsUInteger16()) {
+    LoadHalfWord(dst, mem, scratch);
+#if V8_TARGET_ARCH_PPC64
+  } else if (r.IsInteger32()) {
+    LoadWord(dst, mem, scratch);
+#endif
+  } else {
+    LoadP(dst, mem, scratch);
+  }
+}
+
+
+void MacroAssembler::StoreRepresentation(Register src, const MemOperand& mem,
+                                         Representation r, Register scratch) {
+  DCHECK(!r.IsDouble());
+  if (r.IsInteger8() || r.IsUInteger8()) {
+    StoreByte(src, mem, scratch);
+  } else if (r.IsInteger16() || r.IsUInteger16()) {
+    StoreHalfWord(src, mem, scratch);
+#if V8_TARGET_ARCH_PPC64
+  } else if (r.IsInteger32()) {
+    StoreWord(src, mem, scratch);
+#endif
+  } else {
+    if (r.IsHeapObject()) {
+      AssertNotSmi(src);
+    } else if (r.IsSmi()) {
+      AssertSmi(src);
+    }
+    StoreP(src, mem, scratch);
+  }
+}
+
+
+void MacroAssembler::TestJSArrayForAllocationMemento(Register receiver_reg,
+                                                     Register scratch_reg,
+                                                     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());
+  addi(scratch_reg, receiver_reg,
+       Operand(JSArray::kSize + AllocationMemento::kSize - kHeapObjectTag));
+  Cmpi(scratch_reg, Operand(new_space_start), r0);
+  blt(no_memento_found);
+  mov(ip, Operand(new_space_allocation_top));
+  LoadP(ip, MemOperand(ip));
+  cmp(scratch_reg, ip);
+  bgt(no_memento_found);
+  LoadP(scratch_reg, MemOperand(scratch_reg, -AllocationMemento::kSize));
+  Cmpi(scratch_reg, Operand(isolate()->factory()->allocation_memento_map()),
+       r0);
+}
+
+
+Register GetRegisterThatIsNotOneOf(Register reg1, Register reg2, Register reg3,
+                                   Register reg4, Register reg5,
+                                   Register reg6) {
+  RegList regs = 0;
+  if (reg1.is_valid()) regs |= reg1.bit();
+  if (reg2.is_valid()) regs |= reg2.bit();
+  if (reg3.is_valid()) regs |= reg3.bit();
+  if (reg4.is_valid()) regs |= reg4.bit();
+  if (reg5.is_valid()) regs |= reg5.bit();
+  if (reg6.is_valid()) regs |= reg6.bit();
+
+  for (int i = 0; i < Register::NumAllocatableRegisters(); i++) {
+    Register candidate = Register::FromAllocationIndex(i);
+    if (regs & candidate.bit()) continue;
+    return candidate;
+  }
+  UNREACHABLE();
+  return no_reg;
+}
+
+
+void MacroAssembler::JumpIfDictionaryInPrototypeChain(Register object,
+                                                      Register scratch0,
+                                                      Register scratch1,
+                                                      Label* found) {
+  DCHECK(!scratch1.is(scratch0));
+  Factory* factory = isolate()->factory();
+  Register current = scratch0;
+  Label loop_again;
+
+  // scratch contained elements pointer.
+  mr(current, object);
+
+  // Loop based on the map going up the prototype chain.
+  bind(&loop_again);
+  LoadP(current, FieldMemOperand(current, HeapObject::kMapOffset));
+  lbz(scratch1, FieldMemOperand(current, Map::kBitField2Offset));
+  DecodeField<Map::ElementsKindBits>(scratch1);
+  cmpi(scratch1, Operand(DICTIONARY_ELEMENTS));
+  beq(found);
+  LoadP(current, FieldMemOperand(current, Map::kPrototypeOffset));
+  Cmpi(current, Operand(factory->null_value()), r0);
+  bne(&loop_again);
+}
+
+
+#ifdef DEBUG
+bool AreAliased(Register reg1, Register reg2, Register reg3, Register reg4,
+                Register reg5, Register reg6, Register reg7, Register reg8) {
+  int n_of_valid_regs = reg1.is_valid() + reg2.is_valid() + reg3.is_valid() +
+                        reg4.is_valid() + reg5.is_valid() + reg6.is_valid() +
+                        reg7.is_valid() + reg8.is_valid();
+
+  RegList regs = 0;
+  if (reg1.is_valid()) regs |= reg1.bit();
+  if (reg2.is_valid()) regs |= reg2.bit();
+  if (reg3.is_valid()) regs |= reg3.bit();
+  if (reg4.is_valid()) regs |= reg4.bit();
+  if (reg5.is_valid()) regs |= reg5.bit();
+  if (reg6.is_valid()) regs |= reg6.bit();
+  if (reg7.is_valid()) regs |= reg7.bit();
+  if (reg8.is_valid()) regs |= reg8.bit();
+  int n_of_non_aliasing_regs = NumRegs(regs);
+
+  return n_of_valid_regs != n_of_non_aliasing_regs;
+}
+#endif
+
+
+CodePatcher::CodePatcher(byte* address, int instructions,
+                         FlushICache flush_cache)
+    : address_(address),
+      size_(instructions * Assembler::kInstrSize),
+      masm_(NULL, address, size_ + Assembler::kGap),
+      flush_cache_(flush_cache) {
+  // Create a new macro assembler pointing to the address of the code to patch.
+  // The size is adjusted with kGap on order for the assembler to generate size
+  // bytes of instructions without failing with buffer size constraints.
+  DCHECK(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
+}
+
+
+CodePatcher::~CodePatcher() {
+  // Indicate that code has changed.
+  if (flush_cache_ == FLUSH) {
+    CpuFeatures::FlushICache(address_, size_);
+  }
+
+  // Check that the code was patched as expected.
+  DCHECK(masm_.pc_ == address_ + size_);
+  DCHECK(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
+}
+
+
+void CodePatcher::Emit(Instr instr) { masm()->emit(instr); }
+
+
+void CodePatcher::EmitCondition(Condition cond) {
+  Instr instr = Assembler::instr_at(masm_.pc_);
+  switch (cond) {
+    case eq:
+      instr = (instr & ~kCondMask) | BT;
+      break;
+    case ne:
+      instr = (instr & ~kCondMask) | BF;
+      break;
+    default:
+      UNIMPLEMENTED();
+  }
+  masm_.emit(instr);
+}
+
+
+void MacroAssembler::TruncatingDiv(Register result, Register dividend,
+                                   int32_t divisor) {
+  DCHECK(!dividend.is(result));
+  DCHECK(!dividend.is(r0));
+  DCHECK(!result.is(r0));
+  MultiplierAndShift ms(divisor);
+  mov(r0, Operand(ms.multiplier()));
+  mulhw(result, dividend, r0);
+  if (divisor > 0 && ms.multiplier() < 0) {
+    add(result, result, dividend);
+  }
+  if (divisor < 0 && ms.multiplier() > 0) {
+    sub(result, result, dividend);
+  }
+  if (ms.shift() > 0) srawi(result, result, ms.shift());
+  ExtractBit(r0, dividend, 31);
+  add(result, result, r0);
+}
+}
+}  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_PPC