Reland of Reland of "ARM64: Add NEON support"

src/arm64/simulator-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARM64_SIMULATOR_ARM64_H_
 #define V8_ARM64_SIMULATOR_ARM64_H_
 
 #include <stdarg.h>
 #include <vector>
 
@@ skipping 49 matching lines @@
     return try_catch_address;
   }
 
   static void UnregisterCTryCatch(v8::internal::Isolate* isolate) {
     USE(isolate);
   }
 };
 
 #else  // !defined(USE_SIMULATOR)
 
+// Assemble the specified IEEE-754 components into the target type and apply
+// appropriate rounding.
+//  sign:     0 = positive, 1 = negative
+//  exponent: Unbiased IEEE-754 exponent.
+//  mantissa: The mantissa of the input. The top bit (which is not encoded for
+//            normal IEEE-754 values) must not be omitted. This bit has the
+//            value 'pow(2, exponent)'.
+//
+// The input value is assumed to be a normalized value. That is, the input may
+// not be infinity or NaN. If the source value is subnormal, it must be
+// normalized before calling this function such that the highest set bit in the
+// mantissa has the value 'pow(2, exponent)'.
+//
+// Callers should use FPRoundToFloat or FPRoundToDouble directly, rather than
+// calling a templated FPRound.
+template <class T, int ebits, int mbits>
+T FPRound(int64_t sign, int64_t exponent, uint64_t mantissa,
+          FPRounding round_mode) {
+  static_assert((sizeof(T) * 8) >= (1 + ebits + mbits),
+                "destination type T not large enough");
+  static_assert(sizeof(T) <= sizeof(uint64_t),
+                "maximum size of destination type T is 64 bits");
+  static_assert(std::is_unsigned<T>::value,
+                "destination type T must be unsigned");
+
+  DCHECK((sign == 0) || (sign == 1));
+
+  // Only FPTieEven and FPRoundOdd rounding modes are implemented.
+  DCHECK((round_mode == FPTieEven) || (round_mode == FPRoundOdd));
+
+  // Rounding can promote subnormals to normals, and normals to infinities. For
+  // example, a double with exponent 127 (FLT_MAX_EXP) would appear to be
+  // encodable as a float, but rounding based on the low-order mantissa bits
+  // could make it overflow. With ties-to-even rounding, this value would become
+  // an infinity.
+
+  // ---- Rounding Method ----
+  //
+  // The exponent is irrelevant in the rounding operation, so we treat the
+  // lowest-order bit that will fit into the result ('onebit') as having
+  // the value '1'. Similarly, the highest-order bit that won't fit into
+  // the result ('halfbit') has the value '0.5'. The 'point' sits between
+  // 'onebit' and 'halfbit':
+  //
+  //            These bits fit into the result.
+  //               |---------------------|
+  //  mantissa = 0bxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+  //                                     ||
+  //                                    / |
+  //                                   /  halfbit
+  //                               onebit
+  //
+  // For subnormal outputs, the range of representable bits is smaller and
+  // the position of onebit and halfbit depends on the exponent of the
+  // input, but the method is otherwise similar.
+  //
+  //   onebit(frac)
+  //     |
+  //     | halfbit(frac)          halfbit(adjusted)
+  //     | /                      /
+  //     | |                      |
+  //  0b00.0 (exact)      -> 0b00.0 (exact)                    -> 0b00
+  //  0b00.0...           -> 0b00.0...                         -> 0b00
+  //  0b00.1 (exact)      -> 0b00.0111..111                    -> 0b00
+  //  0b00.1...           -> 0b00.1...                         -> 0b01
+  //  0b01.0 (exact)      -> 0b01.0 (exact)                    -> 0b01
+  //  0b01.0...           -> 0b01.0...                         -> 0b01
+  //  0b01.1 (exact)      -> 0b01.1 (exact)                    -> 0b10
+  //  0b01.1...           -> 0b01.1...                         -> 0b10
+  //  0b10.0 (exact)      -> 0b10.0 (exact)                    -> 0b10
+  //  0b10.0...           -> 0b10.0...                         -> 0b10
+  //  0b10.1 (exact)      -> 0b10.0111..111                    -> 0b10
+  //  0b10.1...           -> 0b10.1...                         -> 0b11
+  //  0b11.0 (exact)      -> 0b11.0 (exact)                    -> 0b11
+  //  ...                   /             |                      /   |
+  //                       /              |                     /    |
+  //                                                           /     |
+  // adjusted = frac - (halfbit(mantissa) & ~onebit(frac));   /      |
+  //
+  //                   mantissa = (mantissa >> shift) + halfbit(adjusted);
+
+  const int mantissa_offset = 0;
+  const int exponent_offset = mantissa_offset + mbits;
+  const int sign_offset = exponent_offset + ebits;
+  DCHECK_EQ(sign_offset, static_cast<int>(sizeof(T) * 8 - 1));
+
+  // Bail out early for zero inputs.
+  if (mantissa == 0) {
+    return static_cast<T>(sign << sign_offset);
+  }
+
+  // If all bits in the exponent are set, the value is infinite or NaN.
+  // This is true for all binary IEEE-754 formats.
+  const int infinite_exponent = (1 << ebits) - 1;
+  const int max_normal_exponent = infinite_exponent - 1;
+
+  // Apply the exponent bias to encode it for the result. Doing this early makes
+  // it easy to detect values that will be infinite or subnormal.
+  exponent += max_normal_exponent >> 1;
+
+  if (exponent > max_normal_exponent) {
+    // Overflow: the input is too large for the result type to represent.
+    if (round_mode == FPTieEven) {
+      // FPTieEven rounding mode handles overflows using infinities.
+      exponent = infinite_exponent;
+      mantissa = 0;
+    } else {
+      DCHECK_EQ(round_mode, FPRoundOdd);
+      // FPRoundOdd rounding mode handles overflows using the largest magnitude
+      // normal number.
+      exponent = max_normal_exponent;
+      mantissa = (UINT64_C(1) << exponent_offset) - 1;
+    }
+    return static_cast<T>((sign << sign_offset) |
+                          (exponent << exponent_offset) |
+                          (mantissa << mantissa_offset));
+  }
+
+  // Calculate the shift required to move the top mantissa bit to the proper
+  // place in the destination type.
+  const int highest_significant_bit = 63 - CountLeadingZeros(mantissa, 64);
+  int shift = highest_significant_bit - mbits;
+
+  if (exponent <= 0) {
+    // The output will be subnormal (before rounding).
+    // For subnormal outputs, the shift must be adjusted by the exponent. The +1
+    // is necessary because the exponent of a subnormal value (encoded as 0) is
+    // the same as the exponent of the smallest normal value (encoded as 1).
+    shift += -exponent + 1;
+
+    // Handle inputs that would produce a zero output.
+    //
+    // Shifts higher than highest_significant_bit+1 will always produce a zero
+    // result. A shift of exactly highest_significant_bit+1 might produce a
+    // non-zero result after rounding.
+    if (shift > (highest_significant_bit + 1)) {
+      if (round_mode == FPTieEven) {
+        // The result will always be +/-0.0.
+        return static_cast<T>(sign << sign_offset);
+      } else {
+        DCHECK_EQ(round_mode, FPRoundOdd);
+        DCHECK_NE(mantissa, 0U);
+        // For FPRoundOdd, if the mantissa is too small to represent and
+        // non-zero return the next "odd" value.
+        return static_cast<T>((sign << sign_offset) | 1);
+      }
+    }
+
+    // Properly encode the exponent for a subnormal output.
+    exponent = 0;
+  } else {
+    // Clear the topmost mantissa bit, since this is not encoded in IEEE-754
+    // normal values.
+    mantissa &= ~(UINT64_C(1) << highest_significant_bit);
+  }
+
+  if (shift > 0) {
+    if (round_mode == FPTieEven) {
+      // We have to shift the mantissa to the right. Some precision is lost, so
+      // we need to apply rounding.
+      uint64_t onebit_mantissa = (mantissa >> (shift)) & 1;
+      uint64_t halfbit_mantissa = (mantissa >> (shift - 1)) & 1;
+      uint64_t adjustment = (halfbit_mantissa & ~onebit_mantissa);
+      uint64_t adjusted = mantissa - adjustment;
+      T halfbit_adjusted = (adjusted >> (shift - 1)) & 1;
+
+      T result =
+          static_cast<T>((sign << sign_offset) | (exponent << exponent_offset) |
+                         ((mantissa >> shift) << mantissa_offset));
+
+      // A very large mantissa can overflow during rounding. If this happens,
+      // the exponent should be incremented and the mantissa set to 1.0
+      // (encoded as 0). Applying halfbit_adjusted after assembling the float
+      // has the nice side-effect that this case is handled for free.
+      //
+      // This also handles cases where a very large finite value overflows to
+      // infinity, or where a very large subnormal value overflows to become
+      // normal.
+      return result + halfbit_adjusted;
+    } else {
+      DCHECK_EQ(round_mode, FPRoundOdd);
+      // If any bits at position halfbit or below are set, onebit (ie. the
+      // bottom bit of the resulting mantissa) must be set.
+      uint64_t fractional_bits = mantissa & ((UINT64_C(1) << shift) - 1);
+      if (fractional_bits != 0) {
+        mantissa |= UINT64_C(1) << shift;
+      }
+
+      return static_cast<T>((sign << sign_offset) |
+                            (exponent << exponent_offset) |
+                            ((mantissa >> shift) << mantissa_offset));
+    }
+  } else {
+    // We have to shift the mantissa to the left (or not at all). The input
+    // mantissa is exactly representable in the output mantissa, so apply no
+    // rounding correction.
+    return static_cast<T>((sign << sign_offset) |
+                          (exponent << exponent_offset) |
+                          ((mantissa << -shift) << mantissa_offset));
+  }
+}
+
+// Representation of memory, with typed getters and setters for access.
+class SimMemory {
+ public:
+  template <typename T>
+  static T AddressUntag(T address) {
+    // Cast the address using a C-style cast. A reinterpret_cast would be
+    // appropriate, but it can't cast one integral type to another.
+    uint64_t bits = (uint64_t)address;
+    return (T)(bits & ~kAddressTagMask);
+  }
+
+  template <typename T, typename A>
+  static T Read(A address) {
+    T value;
+    address = AddressUntag(address);
+    DCHECK((sizeof(value) == 1) || (sizeof(value) == 2) ||
+           (sizeof(value) == 4) || (sizeof(value) == 8) ||
+           (sizeof(value) == 16));
+    memcpy(&value, reinterpret_cast<const char*>(address), sizeof(value));
+    return value;
+  }
+
+  template <typename T, typename A>
+  static void Write(A address, T value) {
+    address = AddressUntag(address);
+    DCHECK((sizeof(value) == 1) || (sizeof(value) == 2) ||
+           (sizeof(value) == 4) || (sizeof(value) == 8) ||
+           (sizeof(value) == 16));
+    memcpy(reinterpret_cast<char*>(address), &value, sizeof(value));
+  }
+};
 
 // The proper way to initialize a simulated system register (such as NZCV) is as
 // follows:
 //  SimSystemRegister nzcv = SimSystemRegister::DefaultValueFor(NZCV);
 class SimSystemRegister {
  public:
   // The default constructor represents a register which has no writable bits.
   // It is not possible to set its value to anything other than 0.
   SimSystemRegister() : value_(0), write_ignore_mask_(0xffffffff) { }
 
@@ skipping 35 matching lines @@
   // describes the bits which are not modifiable.
   SimSystemRegister(uint32_t value, uint32_t write_ignore_mask)
       : value_(value), write_ignore_mask_(write_ignore_mask) { }
 
   uint32_t value_;
   uint32_t write_ignore_mask_;
 };
 
 
 // Represent a register (r0-r31, v0-v31).
+template <int kSizeInBytes>
 class SimRegisterBase {
  public:
   template<typename T>
   void Set(T new_value) {
-    value_ = 0;
+    static_assert(sizeof(new_value) <= kSizeInBytes,
+                  "Size of new_value must be <= size of template type.");
+    if (sizeof(new_value) < kSizeInBytes) {
+      // All AArch64 registers are zero-extending.
+      memset(value_ + sizeof(new_value), 0, kSizeInBytes - sizeof(new_value));
+    }
     memcpy(&value_, &new_value, sizeof(T));
-  }
-
-  template<typename T>
-  T Get() const {
+    NotifyRegisterWrite();
+  }
+
+  // Insert a typed value into a register, leaving the rest of the register
+  // unchanged. The lane parameter indicates where in the register the value
+  // should be inserted, in the range [ 0, sizeof(value_) / sizeof(T) ), where
+  // 0 represents the least significant bits.
+  template <typename T>
+  void Insert(int lane, T new_value) {
+    DCHECK_GE(lane, 0);
+    DCHECK_LE(sizeof(new_value) + (lane * sizeof(new_value)),
+              static_cast<unsigned>(kSizeInBytes));
+    memcpy(&value_[lane * sizeof(new_value)], &new_value, sizeof(new_value));
+    NotifyRegisterWrite();
+  }
+
+  template <typename T>
+  T Get(int lane = 0) const {
     T result;
-    memcpy(&result, &value_, sizeof(T));
+    DCHECK_GE(lane, 0);
+    DCHECK_LE(sizeof(result) + (lane * sizeof(result)),
+              static_cast<unsigned>(kSizeInBytes));
+    memcpy(&result, &value_[lane * sizeof(result)], sizeof(result));
     return result;
   }
 
+  // TODO(all): Make this return a map of updated bytes, so that we can
+  // highlight updated lanes for load-and-insert. (That never happens for scalar
+  // code, but NEON has some instructions that can update individual lanes.)
+  bool WrittenSinceLastLog() const { return written_since_last_log_; }
+
+  void NotifyRegisterLogged() { written_since_last_log_ = false; }
+
  protected:
-  int64_t value_;
+  uint8_t value_[kSizeInBytes];
+
+  // Helpers to aid with register tracing.
+  bool written_since_last_log_;
+
+  void NotifyRegisterWrite() { written_since_last_log_ = true; }
 };
 
-
-typedef SimRegisterBase SimRegister;      // r0-r31
-typedef SimRegisterBase SimFPRegister;    // v0-v31
-
+typedef SimRegisterBase<kXRegSize> SimRegister;   // r0-r31
+typedef SimRegisterBase<kQRegSize> SimVRegister;  // v0-v31
+
+// Representation of a vector register, with typed getters and setters for lanes
+// and additional information to represent lane state.
+class LogicVRegister {
+ public:
+  inline LogicVRegister(SimVRegister& other)  // NOLINT
+      : register_(other) {
+    for (unsigned i = 0; i < arraysize(saturated_); i++) {
+      saturated_[i] = kNotSaturated;
+    }
+    for (unsigned i = 0; i < arraysize(round_); i++) {
+      round_[i] = false;
+    }
+  }
+
+  int64_t Int(VectorFormat vform, int index) const {
+    int64_t element;
+    switch (LaneSizeInBitsFromFormat(vform)) {
+      case 8:
+        element = register_.Get<int8_t>(index);
+        break;
+      case 16:
+        element = register_.Get<int16_t>(index);
+        break;
+      case 32:
+        element = register_.Get<int32_t>(index);
+        break;
+      case 64:
+        element = register_.Get<int64_t>(index);
+        break;
+      default:
+        UNREACHABLE();
+        return 0;
+    }
+    return element;
+  }
+
+  uint64_t Uint(VectorFormat vform, int index) const {
+    uint64_t element;
+    switch (LaneSizeInBitsFromFormat(vform)) {
+      case 8:
+        element = register_.Get<uint8_t>(index);
+        break;
+      case 16:
+        element = register_.Get<uint16_t>(index);
+        break;
+      case 32:
+        element = register_.Get<uint32_t>(index);
+        break;
+      case 64:
+        element = register_.Get<uint64_t>(index);
+        break;
+      default:
+        UNREACHABLE();
+        return 0;
+    }
+    return element;
+  }
+
+  uint64_t UintLeftJustified(VectorFormat vform, int index) const {
+    return Uint(vform, index) << (64 - LaneSizeInBitsFromFormat(vform));
+  }
+
+  int64_t IntLeftJustified(VectorFormat vform, int index) const {
+    uint64_t value = UintLeftJustified(vform, index);
+    int64_t result;
+    memcpy(&result, &value, sizeof(result));
+    return result;
+  }
+
+  void SetInt(VectorFormat vform, int index, int64_t value) const {
+    switch (LaneSizeInBitsFromFormat(vform)) {
+      case 8:
+        register_.Insert(index, static_cast<int8_t>(value));
+        break;
+      case 16:
+        register_.Insert(index, static_cast<int16_t>(value));
+        break;
+      case 32:
+        register_.Insert(index, static_cast<int32_t>(value));
+        break;
+      case 64:
+        register_.Insert(index, static_cast<int64_t>(value));
+        break;
+      default:
+        UNREACHABLE();
+        return;
+    }
+  }
+
+  void SetIntArray(VectorFormat vform, const int64_t* src) const {
+    ClearForWrite(vform);
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      SetInt(vform, i, src[i]);
+    }
+  }
+
+  void SetUint(VectorFormat vform, int index, uint64_t value) const {
+    switch (LaneSizeInBitsFromFormat(vform)) {
+      case 8:
+        register_.Insert(index, static_cast<uint8_t>(value));
+        break;
+      case 16:
+        register_.Insert(index, static_cast<uint16_t>(value));
+        break;
+      case 32:
+        register_.Insert(index, static_cast<uint32_t>(value));
+        break;
+      case 64:
+        register_.Insert(index, static_cast<uint64_t>(value));
+        break;
+      default:
+        UNREACHABLE();
+        return;
+    }
+  }
+
+  void SetUintArray(VectorFormat vform, const uint64_t* src) const {
+    ClearForWrite(vform);
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      SetUint(vform, i, src[i]);
+    }
+  }
+
+  void ReadUintFromMem(VectorFormat vform, int index, uint64_t addr) const;
+
+  void WriteUintToMem(VectorFormat vform, int index, uint64_t addr) const;
+
+  template <typename T>
+  T Float(int index) const {
+    return register_.Get<T>(index);
+  }
+
+  template <typename T>
+  void SetFloat(int index, T value) const {
+    register_.Insert(index, value);
+  }
+
+  // When setting a result in a register of size less than Q, the top bits of
+  // the Q register must be cleared.
+  void ClearForWrite(VectorFormat vform) const {
+    unsigned size = RegisterSizeInBytesFromFormat(vform);
+    for (unsigned i = size; i < kQRegSize; i++) {
+      SetUint(kFormat16B, i, 0);
+    }
+  }
+
+  // Saturation state for each lane of a vector.
+  enum Saturation {
+    kNotSaturated = 0,
+    kSignedSatPositive = 1 << 0,
+    kSignedSatNegative = 1 << 1,
+    kSignedSatMask = kSignedSatPositive | kSignedSatNegative,
+    kSignedSatUndefined = kSignedSatMask,
+    kUnsignedSatPositive = 1 << 2,
+    kUnsignedSatNegative = 1 << 3,
+    kUnsignedSatMask = kUnsignedSatPositive | kUnsignedSatNegative,
+    kUnsignedSatUndefined = kUnsignedSatMask
+  };
+
+  // Getters for saturation state.
+  Saturation GetSignedSaturation(int index) {
+    return static_cast<Saturation>(saturated_[index] & kSignedSatMask);
+  }
+
+  Saturation GetUnsignedSaturation(int index) {
+    return static_cast<Saturation>(saturated_[index] & kUnsignedSatMask);
+  }
+
+  // Setters for saturation state.
+  void ClearSat(int index) { saturated_[index] = kNotSaturated; }
+
+  void SetSignedSat(int index, bool positive) {
+    SetSatFlag(index, positive ? kSignedSatPositive : kSignedSatNegative);
+  }
+
+  void SetUnsignedSat(int index, bool positive) {
+    SetSatFlag(index, positive ? kUnsignedSatPositive : kUnsignedSatNegative);
+  }
+
+  void SetSatFlag(int index, Saturation sat) {
+    saturated_[index] = static_cast<Saturation>(saturated_[index] | sat);
+    DCHECK_NE(sat & kUnsignedSatMask, kUnsignedSatUndefined);
+    DCHECK_NE(sat & kSignedSatMask, kSignedSatUndefined);
+  }
+
+  // Saturate lanes of a vector based on saturation state.
+  LogicVRegister& SignedSaturate(VectorFormat vform) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      Saturation sat = GetSignedSaturation(i);
+      if (sat == kSignedSatPositive) {
+        SetInt(vform, i, MaxIntFromFormat(vform));
+      } else if (sat == kSignedSatNegative) {
+        SetInt(vform, i, MinIntFromFormat(vform));
+      }
+    }
+    return *this;
+  }
+
+  LogicVRegister& UnsignedSaturate(VectorFormat vform) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      Saturation sat = GetUnsignedSaturation(i);
+      if (sat == kUnsignedSatPositive) {
+        SetUint(vform, i, MaxUintFromFormat(vform));
+      } else if (sat == kUnsignedSatNegative) {
+        SetUint(vform, i, 0);
+      }
+    }
+    return *this;
+  }
+
+  // Getter for rounding state.
+  bool GetRounding(int index) { return round_[index]; }
+
+  // Setter for rounding state.
+  void SetRounding(int index, bool round) { round_[index] = round; }
+
+  // Round lanes of a vector based on rounding state.
+  LogicVRegister& Round(VectorFormat vform) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      SetUint(vform, i, Uint(vform, i) + (GetRounding(i) ? 1 : 0));
+    }
+    return *this;
+  }
+
+  // Unsigned halve lanes of a vector, and use the saturation state to set the
+  // top bit.
+  LogicVRegister& Uhalve(VectorFormat vform) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      uint64_t val = Uint(vform, i);
+      SetRounding(i, (val & 1) == 1);
+      val >>= 1;
+      if (GetUnsignedSaturation(i) != kNotSaturated) {
+        // If the operation causes unsigned saturation, the bit shifted into the
+        // most significant bit must be set.
+        val |= (MaxUintFromFormat(vform) >> 1) + 1;
+      }
+      SetInt(vform, i, val);
+    }
+    return *this;
+  }
+
+  // Signed halve lanes of a vector, and use the carry state to set the top bit.
+  LogicVRegister& Halve(VectorFormat vform) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      int64_t val = Int(vform, i);
+      SetRounding(i, (val & 1) == 1);
+      val >>= 1;
+      if (GetSignedSaturation(i) != kNotSaturated) {
+        // If the operation causes signed saturation, the sign bit must be
+        // inverted.
+        val ^= (MaxUintFromFormat(vform) >> 1) + 1;
+      }
+      SetInt(vform, i, val);
+    }
+    return *this;
+  }
+
+ private:
+  SimVRegister& register_;
+
+  // Allocate one saturation state entry per lane; largest register is type Q,
+  // and lanes can be a minimum of one byte wide.
+  Saturation saturated_[kQRegSize];
+
+  // Allocate one rounding state entry per lane.
+  bool round_[kQRegSize];
+};
 
 class Simulator : public DecoderVisitor {
  public:
   static void FlushICache(base::CustomMatcherHashMap* i_cache, void* start,
                           size_t size) {
     USE(i_cache);
     USE(start);
     USE(size);
   }
 
@@ skipping 146 matching lines @@
 
   virtual void Decode(Instruction* instr) {
     decoder_->Decode(instr);
   }
 
   void ExecuteInstruction() {
     DCHECK(IsAligned(reinterpret_cast<uintptr_t>(pc_), kInstructionSize));
     CheckBreakNext();
     Decode(pc_);
     increment_pc();
+    LogAllWrittenRegisters();
     CheckBreakpoints();
   }
 
   // Declare all Visitor functions.
   #define DECLARE(A)  void Visit##A(Instruction* instr);
   VISITOR_LIST(DECLARE)
   #undef DECLARE
 
   bool IsZeroRegister(unsigned code, Reg31Mode r31mode) const {
     return ((code == 31) && (r31mode == Reg31IsZeroRegister));
   }
 
   // Register accessors.
   // Return 'size' bits of the value of an integer register, as the specified
   // type. The value is zero-extended to fill the result.
   //
   template<typename T>
   T reg(unsigned code, Reg31Mode r31mode = Reg31IsZeroRegister) const {
-    DCHECK(code < kNumberOfRegisters);
+    DCHECK_LT(code, static_cast<unsigned>(kNumberOfRegisters));
     if (IsZeroRegister(code, r31mode)) {
       return 0;
     }
     return registers_[code].Get<T>();
   }
 
   // Common specialized accessors for the reg() template.
   int32_t wreg(unsigned code, Reg31Mode r31mode = Reg31IsZeroRegister) const {
     return reg<int32_t>(code, r31mode);
   }
 
   int64_t xreg(unsigned code, Reg31Mode r31mode = Reg31IsZeroRegister) const {
     return reg<int64_t>(code, r31mode);
   }
 
+  enum RegLogMode { LogRegWrites, NoRegLog };
+
   // Write 'value' into an integer register. The value is zero-extended. This
   // behaviour matches AArch64 register writes.
   template<typename T>
   void set_reg(unsigned code, T value,
                Reg31Mode r31mode = Reg31IsZeroRegister) {
     set_reg_no_log(code, value, r31mode);
     LogRegister(code, r31mode);
   }
 
   // Common specialized accessors for the set_reg() template.
   void set_wreg(unsigned code, int32_t value,
                 Reg31Mode r31mode = Reg31IsZeroRegister) {
     set_reg(code, value, r31mode);
   }
 
   void set_xreg(unsigned code, int64_t value,
                 Reg31Mode r31mode = Reg31IsZeroRegister) {
     set_reg(code, value, r31mode);
   }
 
   // As above, but don't automatically log the register update.
   template <typename T>
   void set_reg_no_log(unsigned code, T value,
                       Reg31Mode r31mode = Reg31IsZeroRegister) {
-    DCHECK(code < kNumberOfRegisters);
+    DCHECK_LT(code, static_cast<unsigned>(kNumberOfRegisters));
     if (!IsZeroRegister(code, r31mode)) {
       registers_[code].Set(value);
     }
   }
 
   void set_wreg_no_log(unsigned code, int32_t value,
                        Reg31Mode r31mode = Reg31IsZeroRegister) {
     set_reg_no_log(code, value, r31mode);
   }
 
   void set_xreg_no_log(unsigned code, int64_t value,
                        Reg31Mode r31mode = Reg31IsZeroRegister) {
     set_reg_no_log(code, value, r31mode);
   }
 
   // Commonly-used special cases.
   template<typename T>
   void set_lr(T value) {
-    DCHECK(sizeof(T) == kPointerSize);
+    DCHECK_EQ(sizeof(T), static_cast<unsigned>(kPointerSize));
     set_reg(kLinkRegCode, value);
   }
 
   template<typename T>
   void set_sp(T value) {
-    DCHECK(sizeof(T) == kPointerSize);
+    DCHECK_EQ(sizeof(T), static_cast<unsigned>(kPointerSize));
     set_reg(31, value, Reg31IsStackPointer);
   }
 
+  // Vector register accessors.
+  // These are equivalent to the integer register accessors, but for vector
+  // registers.
+
+  // A structure for representing a 128-bit Q register.
+  struct qreg_t {
+    uint8_t val[kQRegSize];
+  };
+
+  // Basic accessor: read the register as the specified type.
+  template <typename T>
+  T vreg(unsigned code) const {
+    static_assert((sizeof(T) == kBRegSize) || (sizeof(T) == kHRegSize) ||
+                      (sizeof(T) == kSRegSize) || (sizeof(T) == kDRegSize) ||
+                      (sizeof(T) == kQRegSize),
+                  "Template type must match size of register.");
+    DCHECK_LT(code, static_cast<unsigned>(kNumberOfVRegisters));
+
+    return vregisters_[code].Get<T>();
+  }
+
+  inline SimVRegister& vreg(unsigned code) { return vregisters_[code]; }
+
   int64_t sp() { return xreg(31, Reg31IsStackPointer); }
   int64_t jssp() { return xreg(kJSSPCode, Reg31IsStackPointer); }
   int64_t fp() {
       return xreg(kFramePointerRegCode, Reg31IsStackPointer);
   }
   Instruction* lr() { return reg<Instruction*>(kLinkRegCode); }
 
   Address get_sp() const { return reg<Address>(31, Reg31IsStackPointer); }
 
-  template<typename T>
-  T fpreg(unsigned code) const {
-    DCHECK(code < kNumberOfRegisters);
-    return fpregisters_[code].Get<T>();
-  }
+  // Common specialized accessors for the vreg() template.
+  uint8_t breg(unsigned code) const { return vreg<uint8_t>(code); }
 
-  // Common specialized accessors for the fpreg() template.
-  float sreg(unsigned code) const {
-    return fpreg<float>(code);
-  }
+  float hreg(unsigned code) const { return vreg<uint16_t>(code); }
 
-  uint32_t sreg_bits(unsigned code) const {
-    return fpreg<uint32_t>(code);
-  }
+  float sreg(unsigned code) const { return vreg<float>(code); }
 
-  double dreg(unsigned code) const {
-    return fpreg<double>(code);
-  }
+  uint32_t sreg_bits(unsigned code) const { return vreg<uint32_t>(code); }
 
-  uint64_t dreg_bits(unsigned code) const {
-    return fpreg<uint64_t>(code);
-  }
+  double dreg(unsigned code) const { return vreg<double>(code); }
 
-  double fpreg(unsigned size, unsigned code) const {
+  uint64_t dreg_bits(unsigned code) const { return vreg<uint64_t>(code); }
+
+  qreg_t qreg(unsigned code) const { return vreg<qreg_t>(code); }
+
+  // As above, with parameterized size and return type. The value is
+  // either zero-extended or truncated to fit, as required.
+  template <typename T>
+  T vreg(unsigned size, unsigned code) const {
+    uint64_t raw = 0;
+    T result;
+
     switch (size) {
-      case kSRegSizeInBits: return sreg(code);
-      case kDRegSizeInBits: return dreg(code);
+      case kSRegSize:
+        raw = vreg<uint32_t>(code);
+        break;
+      case kDRegSize:
+        raw = vreg<uint64_t>(code);
+        break;
       default:
         UNREACHABLE();
     }
+
+    static_assert(sizeof(result) <= sizeof(raw),
+                  "Template type must be <= 64 bits.");
+    // Copy the result and truncate to fit. This assumes a little-endian host.
+    memcpy(&result, &raw, sizeof(result));
+    return result;
   }
 
   // Write 'value' into a floating-point register. The value is zero-extended.
   // This behaviour matches AArch64 register writes.
-  template<typename T>
-  void set_fpreg(unsigned code, T value) {
-    set_fpreg_no_log(code, value);
+  template <typename T>
+  void set_vreg(unsigned code, T value, RegLogMode log_mode = LogRegWrites) {
+    static_assert(
+        (sizeof(value) == kBRegSize) || (sizeof(value) == kHRegSize) ||
+            (sizeof(value) == kSRegSize) || (sizeof(value) == kDRegSize) ||
+            (sizeof(value) == kQRegSize),
+        "Template type must match size of register.");
+    DCHECK_LT(code, static_cast<unsigned>(kNumberOfVRegisters));
+    vregisters_[code].Set(value);
 
-    if (sizeof(value) <= kSRegSize) {
-      LogFPRegister(code, kPrintSRegValue);
-    } else {
-      LogFPRegister(code, kPrintDRegValue);
+    if (log_mode == LogRegWrites) {
+      LogVRegister(code, GetPrintRegisterFormat(value));
     }
   }
 
-  // Common specialized accessors for the set_fpreg() template.
-  void set_sreg(unsigned code, float value) {
-    set_fpreg(code, value);
+  // Common specialized accessors for the set_vreg() template.
+  void set_breg(unsigned code, int8_t value,
+                RegLogMode log_mode = LogRegWrites) {
+    set_vreg(code, value, log_mode);
   }
 
-  void set_sreg_bits(unsigned code, uint32_t value) {
-    set_fpreg(code, value);
+  void set_hreg(unsigned code, int16_t value,
+                RegLogMode log_mode = LogRegWrites) {
+    set_vreg(code, value, log_mode);
   }
 
-  void set_dreg(unsigned code, double value) {
-    set_fpreg(code, value);
+  void set_sreg(unsigned code, float value,
+                RegLogMode log_mode = LogRegWrites) {
+    set_vreg(code, value, log_mode);
   }
 
-  void set_dreg_bits(unsigned code, uint64_t value) {
-    set_fpreg(code, value);
+  void set_sreg_bits(unsigned code, uint32_t value,
+                     RegLogMode log_mode = LogRegWrites) {
+    set_vreg(code, value, log_mode);
+  }
+
+  void set_dreg(unsigned code, double value,
+                RegLogMode log_mode = LogRegWrites) {
+    set_vreg(code, value, log_mode);
+  }
+
+  void set_dreg_bits(unsigned code, uint64_t value,
+                     RegLogMode log_mode = LogRegWrites) {
+    set_vreg(code, value, log_mode);
+  }
+
+  void set_qreg(unsigned code, qreg_t value,
+                RegLogMode log_mode = LogRegWrites) {
+    set_vreg(code, value, log_mode);
   }
 
   // As above, but don't automatically log the register update.
   template <typename T>
-  void set_fpreg_no_log(unsigned code, T value) {
-    DCHECK((sizeof(value) == kDRegSize) || (sizeof(value) == kSRegSize));
-    DCHECK(code < kNumberOfFPRegisters);
-    fpregisters_[code].Set(value);
+  void set_vreg_no_log(unsigned code, T value) {
+    STATIC_ASSERT((sizeof(value) == kBRegSize) ||
+                  (sizeof(value) == kHRegSize) ||
+                  (sizeof(value) == kSRegSize) ||
+                  (sizeof(value) == kDRegSize) || (sizeof(value) == kQRegSize));
+    DCHECK_LT(code, static_cast<unsigned>(kNumberOfVRegisters));
+    vregisters_[code].Set(value);
+  }
+
+  void set_breg_no_log(unsigned code, uint8_t value) {
+    set_vreg_no_log(code, value);
+  }
+
+  void set_hreg_no_log(unsigned code, uint16_t value) {
+    set_vreg_no_log(code, value);
   }
 
   void set_sreg_no_log(unsigned code, float value) {
-    set_fpreg_no_log(code, value);
+    set_vreg_no_log(code, value);
   }
 
   void set_dreg_no_log(unsigned code, double value) {
-    set_fpreg_no_log(code, value);
+    set_vreg_no_log(code, value);
+  }
+
+  void set_qreg_no_log(unsigned code, qreg_t value) {
+    set_vreg_no_log(code, value);
   }
 
   SimSystemRegister& nzcv() { return nzcv_; }
   SimSystemRegister& fpcr() { return fpcr_; }
+  FPRounding RMode() { return static_cast<FPRounding>(fpcr_.RMode()); }
+  bool DN() { return fpcr_.DN() != 0; }
 
   // Debug helpers
 
   // Simulator breakpoints.
   struct Breakpoint {
     Instruction* location;
     bool enabled;
   };
   std::vector<Breakpoint> breakpoints_;
   void SetBreakpoint(Instruction* breakpoint);
   void ListBreakpoints();
   void CheckBreakpoints();
 
   // Helpers for the 'next' command.
   // When this is set, the Simulator will insert a breakpoint after the next BL
   // instruction it meets.
   bool break_on_next_;
   // Check if the Simulator should insert a break after the current instruction
   // for the 'next' command.
   void CheckBreakNext();
 
   // Disassemble instruction at the given address.
   void PrintInstructionsAt(Instruction* pc, uint64_t count);
 
   // Print all registers of the specified types.
   void PrintRegisters();
-  void PrintFPRegisters();
+  void PrintVRegisters();
   void PrintSystemRegisters();
 
-  // Like Print* (above), but respect log_parameters().
-  void LogSystemRegisters() {
-    if (log_parameters() & LOG_SYS_REGS) PrintSystemRegisters();
+  // As above, but only print the registers that have been updated.
+  void PrintWrittenRegisters();
+  void PrintWrittenVRegisters();
+
+  // As above, but respect LOG_REG and LOG_VREG.
+  void LogWrittenRegisters() {
+    if (log_parameters() & LOG_REGS) PrintWrittenRegisters();
   }
-  void LogRegisters() {
-    if (log_parameters() & LOG_REGS) PrintRegisters();
+  void LogWrittenVRegisters() {
+    if (log_parameters() & LOG_VREGS) PrintWrittenVRegisters();
   }
-  void LogFPRegisters() {
-    if (log_parameters() & LOG_FP_REGS) PrintFPRegisters();
+  void LogAllWrittenRegisters() {
+    LogWrittenRegisters();
+    LogWrittenVRegisters();
   }
 
-  // Specify relevant register sizes, for PrintFPRegister.
-  //
-  // These values are bit masks; they can be combined in case multiple views of
-  // a machine register are interesting.
-  enum PrintFPRegisterSizes {
-    kPrintDRegValue = 1 << kDRegSize,
-    kPrintSRegValue = 1 << kSRegSize,
-    kPrintAllFPRegValues = kPrintDRegValue | kPrintSRegValue
+  // Specify relevant register formats for Print(V)Register and related helpers.
+  enum PrintRegisterFormat {
+    // The lane size.
+    kPrintRegLaneSizeB = 0 << 0,
+    kPrintRegLaneSizeH = 1 << 0,
+    kPrintRegLaneSizeS = 2 << 0,
+    kPrintRegLaneSizeW = kPrintRegLaneSizeS,
+    kPrintRegLaneSizeD = 3 << 0,
+    kPrintRegLaneSizeX = kPrintRegLaneSizeD,
+    kPrintRegLaneSizeQ = 4 << 0,
+
+    kPrintRegLaneSizeOffset = 0,
+    kPrintRegLaneSizeMask = 7 << 0,
+
+    // The lane count.
+    kPrintRegAsScalar = 0,
+    kPrintRegAsDVector = 1 << 3,
+    kPrintRegAsQVector = 2 << 3,
+
+    kPrintRegAsVectorMask = 3 << 3,
+
+    // Indicate floating-point format lanes. (This flag is only supported for S-
+    // and D-sized lanes.)
+    kPrintRegAsFP = 1 << 5,
+
+    // Supported combinations.
+
+    kPrintXReg = kPrintRegLaneSizeX | kPrintRegAsScalar,
+    kPrintWReg = kPrintRegLaneSizeW | kPrintRegAsScalar,
+    kPrintSReg = kPrintRegLaneSizeS | kPrintRegAsScalar | kPrintRegAsFP,
+    kPrintDReg = kPrintRegLaneSizeD | kPrintRegAsScalar | kPrintRegAsFP,
+
+    kPrintReg1B = kPrintRegLaneSizeB | kPrintRegAsScalar,
+    kPrintReg8B = kPrintRegLaneSizeB | kPrintRegAsDVector,
+    kPrintReg16B = kPrintRegLaneSizeB | kPrintRegAsQVector,
+    kPrintReg1H = kPrintRegLaneSizeH | kPrintRegAsScalar,
+    kPrintReg4H = kPrintRegLaneSizeH | kPrintRegAsDVector,
+    kPrintReg8H = kPrintRegLaneSizeH | kPrintRegAsQVector,
+    kPrintReg1S = kPrintRegLaneSizeS | kPrintRegAsScalar,
+    kPrintReg2S = kPrintRegLaneSizeS | kPrintRegAsDVector,
+    kPrintReg4S = kPrintRegLaneSizeS | kPrintRegAsQVector,
+    kPrintReg1SFP = kPrintRegLaneSizeS | kPrintRegAsScalar | kPrintRegAsFP,
+    kPrintReg2SFP = kPrintRegLaneSizeS | kPrintRegAsDVector | kPrintRegAsFP,
+    kPrintReg4SFP = kPrintRegLaneSizeS | kPrintRegAsQVector | kPrintRegAsFP,
+    kPrintReg1D = kPrintRegLaneSizeD | kPrintRegAsScalar,
+    kPrintReg2D = kPrintRegLaneSizeD | kPrintRegAsQVector,
+    kPrintReg1DFP = kPrintRegLaneSizeD | kPrintRegAsScalar | kPrintRegAsFP,
+    kPrintReg2DFP = kPrintRegLaneSizeD | kPrintRegAsQVector | kPrintRegAsFP,
+    kPrintReg1Q = kPrintRegLaneSizeQ | kPrintRegAsScalar
   };
 
+  unsigned GetPrintRegLaneSizeInBytesLog2(PrintRegisterFormat format) {
+    return (format & kPrintRegLaneSizeMask) >> kPrintRegLaneSizeOffset;
+  }
+
+  unsigned GetPrintRegLaneSizeInBytes(PrintRegisterFormat format) {
+    return 1 << GetPrintRegLaneSizeInBytesLog2(format);
+  }
+
+  unsigned GetPrintRegSizeInBytesLog2(PrintRegisterFormat format) {
+    if (format & kPrintRegAsDVector) return kDRegSizeLog2;
+    if (format & kPrintRegAsQVector) return kQRegSizeLog2;
+
+    // Scalar types.
+    return GetPrintRegLaneSizeInBytesLog2(format);
+  }
+
+  unsigned GetPrintRegSizeInBytes(PrintRegisterFormat format) {
+    return 1 << GetPrintRegSizeInBytesLog2(format);
+  }
+
+  unsigned GetPrintRegLaneCount(PrintRegisterFormat format) {
+    unsigned reg_size_log2 = GetPrintRegSizeInBytesLog2(format);
+    unsigned lane_size_log2 = GetPrintRegLaneSizeInBytesLog2(format);
+    DCHECK_GE(reg_size_log2, lane_size_log2);
+    return 1 << (reg_size_log2 - lane_size_log2);
+  }
+
+  template <typename T>
+  PrintRegisterFormat GetPrintRegisterFormat(T value) {
+    return GetPrintRegisterFormatForSize(sizeof(value));
+  }
+
+  PrintRegisterFormat GetPrintRegisterFormat(double value) {
+    static_assert(sizeof(value) == kDRegSize,
+                  "D register must be size of double.");
+    return GetPrintRegisterFormatForSizeFP(sizeof(value));
+  }
+
+  PrintRegisterFormat GetPrintRegisterFormat(float value) {
+    static_assert(sizeof(value) == kSRegSize,
+                  "S register must be size of float.");
+    return GetPrintRegisterFormatForSizeFP(sizeof(value));
+  }
+
+  PrintRegisterFormat GetPrintRegisterFormat(VectorFormat vform);
+  PrintRegisterFormat GetPrintRegisterFormatFP(VectorFormat vform);
+
+  PrintRegisterFormat GetPrintRegisterFormatForSize(size_t reg_size,
+                                                    size_t lane_size);
+
+  PrintRegisterFormat GetPrintRegisterFormatForSize(size_t size) {
+    return GetPrintRegisterFormatForSize(size, size);
+  }
+
+  PrintRegisterFormat GetPrintRegisterFormatForSizeFP(size_t size) {
+    switch (size) {
+      default:
+        UNREACHABLE();
+      case kDRegSize:
+        return kPrintDReg;
+      case kSRegSize:
+        return kPrintSReg;
+    }
+  }
+
+  PrintRegisterFormat GetPrintRegisterFormatTryFP(PrintRegisterFormat format) {
+    if ((GetPrintRegLaneSizeInBytes(format) == kSRegSize) ||
+        (GetPrintRegLaneSizeInBytes(format) == kDRegSize)) {
+      return static_cast<PrintRegisterFormat>(format | kPrintRegAsFP);
+    }
+    return format;
+  }
+
   // Print individual register values (after update).
   void PrintRegister(unsigned code, Reg31Mode r31mode = Reg31IsStackPointer);
-  void PrintFPRegister(unsigned code,
-                       PrintFPRegisterSizes sizes = kPrintAllFPRegValues);
+  void PrintVRegister(unsigned code, PrintRegisterFormat sizes);
   void PrintSystemRegister(SystemRegister id);
 
   // Like Print* (above), but respect log_parameters().
   void LogRegister(unsigned code, Reg31Mode r31mode = Reg31IsStackPointer) {
     if (log_parameters() & LOG_REGS) PrintRegister(code, r31mode);
   }
-  void LogFPRegister(unsigned code,
-                     PrintFPRegisterSizes sizes = kPrintAllFPRegValues) {
-    if (log_parameters() & LOG_FP_REGS) PrintFPRegister(code, sizes);
+  void LogVRegister(unsigned code, PrintRegisterFormat format) {
+    if (log_parameters() & LOG_VREGS) PrintVRegister(code, format);
   }
   void LogSystemRegister(SystemRegister id) {
     if (log_parameters() & LOG_SYS_REGS) PrintSystemRegister(id);
   }
 
   // Print memory accesses.
-  void PrintRead(uintptr_t address, size_t size, unsigned reg_code);
-  void PrintReadFP(uintptr_t address, size_t size, unsigned reg_code);
-  void PrintWrite(uintptr_t address, size_t size, unsigned reg_code);
-  void PrintWriteFP(uintptr_t address, size_t size, unsigned reg_code);
+  void PrintRead(uintptr_t address, unsigned reg_code,
+                 PrintRegisterFormat format);
+  void PrintWrite(uintptr_t address, unsigned reg_code,
+                  PrintRegisterFormat format);
+  void PrintVRead(uintptr_t address, unsigned reg_code,
+                  PrintRegisterFormat format, unsigned lane);
+  void PrintVWrite(uintptr_t address, unsigned reg_code,
+                   PrintRegisterFormat format, unsigned lane);
 
   // Like Print* (above), but respect log_parameters().
-  void LogRead(uintptr_t address, size_t size, unsigned reg_code) {
-    if (log_parameters() & LOG_REGS) PrintRead(address, size, reg_code);
+  void LogRead(uintptr_t address, unsigned reg_code,
+               PrintRegisterFormat format) {
+    if (log_parameters() & LOG_REGS) PrintRead(address, reg_code, format);
   }
-  void LogReadFP(uintptr_t address, size_t size, unsigned reg_code) {
-    if (log_parameters() & LOG_FP_REGS) PrintReadFP(address, size, reg_code);
+  void LogWrite(uintptr_t address, unsigned reg_code,
+                PrintRegisterFormat format) {
+    if (log_parameters() & LOG_WRITE) PrintWrite(address, reg_code, format);
   }
-  void LogWrite(uintptr_t address, size_t size, unsigned reg_code) {
-    if (log_parameters() & LOG_WRITE) PrintWrite(address, size, reg_code);
+  void LogVRead(uintptr_t address, unsigned reg_code,
+                PrintRegisterFormat format, unsigned lane = 0) {
+    if (log_parameters() & LOG_VREGS) {
+      PrintVRead(address, reg_code, format, lane);
+    }
   }
-  void LogWriteFP(uintptr_t address, size_t size, unsigned reg_code) {
-    if (log_parameters() & LOG_WRITE) PrintWriteFP(address, size, reg_code);
+  void LogVWrite(uintptr_t address, unsigned reg_code,
+                 PrintRegisterFormat format, unsigned lane = 0) {
+    if (log_parameters() & LOG_WRITE) {
+      PrintVWrite(address, reg_code, format, lane);
+    }
   }
 
   int log_parameters() { return log_parameters_; }
   void set_log_parameters(int new_parameters) {
     log_parameters_ = new_parameters;
     if (!decoder_) {
       if (new_parameters & LOG_DISASM) {
         PrintF("Run --debug-sim to dynamically turn on disassembler\n");
       }
       return;
     }
     if (new_parameters & LOG_DISASM) {
       decoder_->InsertVisitorBefore(print_disasm_, this);
     } else {
       decoder_->RemoveVisitor(print_disasm_);
     }
   }
 
+  // Helper functions for register tracing.
+  void PrintRegisterRawHelper(unsigned code, Reg31Mode r31mode,
+                              int size_in_bytes = kXRegSize);
+  void PrintVRegisterRawHelper(unsigned code, int bytes = kQRegSize,
+                               int lsb = 0);
+  void PrintVRegisterFPHelper(unsigned code, unsigned lane_size_in_bytes,
+                              int lane_count = 1, int rightmost_lane = 0);
+
   static inline const char* WRegNameForCode(unsigned code,
       Reg31Mode mode = Reg31IsZeroRegister);
   static inline const char* XRegNameForCode(unsigned code,
       Reg31Mode mode = Reg31IsZeroRegister);
   static inline const char* SRegNameForCode(unsigned code);
   static inline const char* DRegNameForCode(unsigned code);
   static inline const char* VRegNameForCode(unsigned code);
   static inline int CodeFromName(const char* name);
 
  protected:
@@ skipping 53 matching lines @@
   void ConditionalCompareHelper(Instruction* instr, T op2);
   void LoadStoreHelper(Instruction* instr,
                        int64_t offset,
                        AddrMode addrmode);
   void LoadStorePairHelper(Instruction* instr, AddrMode addrmode);
   uintptr_t LoadStoreAddress(unsigned addr_reg, int64_t offset,
                              AddrMode addrmode);
   void LoadStoreWriteBack(unsigned addr_reg,
                           int64_t offset,
                           AddrMode addrmode);
+  void NEONLoadStoreMultiStructHelper(const Instruction* instr,
+                                      AddrMode addr_mode);
+  void NEONLoadStoreSingleStructHelper(const Instruction* instr,
+                                       AddrMode addr_mode);
   void CheckMemoryAccess(uintptr_t address, uintptr_t stack);
 
   // Memory read helpers.
   template <typename T, typename A>
   T MemoryRead(A address) {
     T value;
     STATIC_ASSERT((sizeof(value) == 1) || (sizeof(value) == 2) ||
-                  (sizeof(value) == 4) || (sizeof(value) == 8));
+                  (sizeof(value) == 4) || (sizeof(value) == 8) ||
+                  (sizeof(value) == 16));
     memcpy(&value, reinterpret_cast<const void*>(address), sizeof(value));
     return value;
   }
 
   // Memory write helpers.
   template <typename T, typename A>
   void MemoryWrite(A address, T value) {
     STATIC_ASSERT((sizeof(value) == 1) || (sizeof(value) == 2) ||
-                  (sizeof(value) == 4) || (sizeof(value) == 8));
+                  (sizeof(value) == 4) || (sizeof(value) == 8) ||
+                  (sizeof(value) == 16));
     memcpy(reinterpret_cast<void*>(address), &value, sizeof(value));
   }
 
   template <typename T>
   T ShiftOperand(T value,
                  Shift shift_type,
                  unsigned amount);
   template <typename T>
   T ExtendValue(T value,
                 Extend extend_type,
                 unsigned left_shift = 0);
   template <typename T>
   void Extract(Instruction* instr);
   template <typename T>
   void DataProcessing2Source(Instruction* instr);
   template <typename T>
   void BitfieldHelper(Instruction* instr);
-
-  template <typename T>
-  T FPDefaultNaN() const;
+  uint16_t PolynomialMult(uint8_t op1, uint8_t op2);
+
+  void ld1(VectorFormat vform, LogicVRegister dst, uint64_t addr);
+  void ld1(VectorFormat vform, LogicVRegister dst, int index, uint64_t addr);
+  void ld1r(VectorFormat vform, LogicVRegister dst, uint64_t addr);
+  void ld2(VectorFormat vform, LogicVRegister dst1, LogicVRegister dst2,
+           uint64_t addr);
+  void ld2(VectorFormat vform, LogicVRegister dst1, LogicVRegister dst2,
+           int index, uint64_t addr);
+  void ld2r(VectorFormat vform, LogicVRegister dst1, LogicVRegister dst2,
+            uint64_t addr);
+  void ld3(VectorFormat vform, LogicVRegister dst1, LogicVRegister dst2,
+           LogicVRegister dst3, uint64_t addr);
+  void ld3(VectorFormat vform, LogicVRegister dst1, LogicVRegister dst2,
+           LogicVRegister dst3, int index, uint64_t addr);
+  void ld3r(VectorFormat vform, LogicVRegister dst1, LogicVRegister dst2,
+            LogicVRegister dst3, uint64_t addr);
+  void ld4(VectorFormat vform, LogicVRegister dst1, LogicVRegister dst2,
+           LogicVRegister dst3, LogicVRegister dst4, uint64_t addr);
+  void ld4(VectorFormat vform, LogicVRegister dst1, LogicVRegister dst2,
+           LogicVRegister dst3, LogicVRegister dst4, int index, uint64_t addr);
+  void ld4r(VectorFormat vform, LogicVRegister dst1, LogicVRegister dst2,
+            LogicVRegister dst3, LogicVRegister dst4, uint64_t addr);
+  void st1(VectorFormat vform, LogicVRegister src, uint64_t addr);
+  void st1(VectorFormat vform, LogicVRegister src, int index, uint64_t addr);
+  void st2(VectorFormat vform, LogicVRegister src, LogicVRegister src2,
+           uint64_t addr);
+  void st2(VectorFormat vform, LogicVRegister src, LogicVRegister src2,
+           int index, uint64_t addr);
+  void st3(VectorFormat vform, LogicVRegister src, LogicVRegister src2,
+           LogicVRegister src3, uint64_t addr);
+  void st3(VectorFormat vform, LogicVRegister src, LogicVRegister src2,
+           LogicVRegister src3, int index, uint64_t addr);
+  void st4(VectorFormat vform, LogicVRegister src, LogicVRegister src2,
+           LogicVRegister src3, LogicVRegister src4, uint64_t addr);
+  void st4(VectorFormat vform, LogicVRegister src, LogicVRegister src2,
+           LogicVRegister src3, LogicVRegister src4, int index, uint64_t addr);
+  LogicVRegister cmp(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2,
+                     Condition cond);
+  LogicVRegister cmp(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, int imm, Condition cond);
+  LogicVRegister cmptst(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister add(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister addp(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister mla(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister mls(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister mul(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister mul(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2,
+                     int index);
+  LogicVRegister mla(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2,
+                     int index);
+  LogicVRegister mls(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2,
+                     int index);
+  LogicVRegister pmul(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+
+  typedef LogicVRegister (Simulator::*ByElementOp)(VectorFormat vform,
+                                                   LogicVRegister dst,
+                                                   const LogicVRegister& src1,
+                                                   const LogicVRegister& src2,
+                                                   int index);
+  LogicVRegister fmul(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2,
+                      int index);
+  LogicVRegister fmla(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2,
+                      int index);
+  LogicVRegister fmls(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2,
+                      int index);
+  LogicVRegister fmulx(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2,
+                       int index);
+  LogicVRegister smull(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2,
+                       int index);
+  LogicVRegister smull2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2,
+                        int index);
+  LogicVRegister umull(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2,
+                       int index);
+  LogicVRegister umull2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2,
+                        int index);
+  LogicVRegister smlal(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2,
+                       int index);
+  LogicVRegister smlal2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2,
+                        int index);
+  LogicVRegister umlal(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2,
+                       int index);
+  LogicVRegister umlal2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2,
+                        int index);
+  LogicVRegister smlsl(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2,
+                       int index);
+  LogicVRegister smlsl2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2,
+                        int index);
+  LogicVRegister umlsl(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2,
+                       int index);
+  LogicVRegister umlsl2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2,
+                        int index);
+  LogicVRegister sqdmull(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1, const LogicVRegister& src2,
+                         int index);
+  LogicVRegister sqdmull2(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src1,
+                          const LogicVRegister& src2, int index);
+  LogicVRegister sqdmlal(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1, const LogicVRegister& src2,
+                         int index);
+  LogicVRegister sqdmlal2(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src1,
+                          const LogicVRegister& src2, int index);
+  LogicVRegister sqdmlsl(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1, const LogicVRegister& src2,
+                         int index);
+  LogicVRegister sqdmlsl2(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src1,
+                          const LogicVRegister& src2, int index);
+  LogicVRegister sqdmulh(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1, const LogicVRegister& src2,
+                         int index);
+  LogicVRegister sqrdmulh(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src1,
+                          const LogicVRegister& src2, int index);
+  LogicVRegister sub(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister and_(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister orr(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister orn(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister eor(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister bic(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister bic(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src, uint64_t imm);
+  LogicVRegister bif(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister bit(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister bsl(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister cls(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src);
+  LogicVRegister clz(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src);
+  LogicVRegister cnt(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src);
+  LogicVRegister not_(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src);
+  LogicVRegister rbit(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src);
+  LogicVRegister rev(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src, int revSize);
+  LogicVRegister rev16(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister rev32(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister rev64(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister addlp(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, bool is_signed,
+                       bool do_accumulate);
+  LogicVRegister saddlp(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister uaddlp(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister sadalp(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister uadalp(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister ext(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src1, const LogicVRegister& src2,
+                     int index);
+  LogicVRegister ins_element(VectorFormat vform, LogicVRegister dst,
+                             int dst_index, const LogicVRegister& src,
+                             int src_index);
+  LogicVRegister ins_immediate(VectorFormat vform, LogicVRegister dst,
+                               int dst_index, uint64_t imm);
+  LogicVRegister dup_element(VectorFormat vform, LogicVRegister dst,
+                             const LogicVRegister& src, int src_index);
+  LogicVRegister dup_immediate(VectorFormat vform, LogicVRegister dst,
+                               uint64_t imm);
+  LogicVRegister movi(VectorFormat vform, LogicVRegister dst, uint64_t imm);
+  LogicVRegister mvni(VectorFormat vform, LogicVRegister dst, uint64_t imm);
+  LogicVRegister orr(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src, uint64_t imm);
+  LogicVRegister sshl(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister ushl(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister SMinMax(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1, const LogicVRegister& src2,
+                         bool max);
+  LogicVRegister smax(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister smin(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister SMinMaxP(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src1,
+                          const LogicVRegister& src2, bool max);
+  LogicVRegister smaxp(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister sminp(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister addp(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src);
+  LogicVRegister addv(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src);
+  LogicVRegister uaddlv(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister saddlv(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister SMinMaxV(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src, bool max);
+  LogicVRegister smaxv(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister sminv(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister uxtl(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src);
+  LogicVRegister uxtl2(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister sxtl(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src);
+  LogicVRegister sxtl2(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister Table(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& ind, bool zero_out_of_bounds,
+                       const LogicVRegister* tab1,
+                       const LogicVRegister* tab2 = NULL,
+                       const LogicVRegister* tab3 = NULL,
+                       const LogicVRegister* tab4 = NULL);
+  LogicVRegister tbl(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& tab, const LogicVRegister& ind);
+  LogicVRegister tbl(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& tab, const LogicVRegister& tab2,
+                     const LogicVRegister& ind);
+  LogicVRegister tbl(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& tab, const LogicVRegister& tab2,
+                     const LogicVRegister& tab3, const LogicVRegister& ind);
+  LogicVRegister tbl(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& tab, const LogicVRegister& tab2,
+                     const LogicVRegister& tab3, const LogicVRegister& tab4,
+                     const LogicVRegister& ind);
+  LogicVRegister tbx(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& tab, const LogicVRegister& ind);
+  LogicVRegister tbx(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& tab, const LogicVRegister& tab2,
+                     const LogicVRegister& ind);
+  LogicVRegister tbx(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& tab, const LogicVRegister& tab2,
+                     const LogicVRegister& tab3, const LogicVRegister& ind);
+  LogicVRegister tbx(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& tab, const LogicVRegister& tab2,
+                     const LogicVRegister& tab3, const LogicVRegister& tab4,
+                     const LogicVRegister& ind);
+  LogicVRegister uaddl(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister uaddl2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister uaddw(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister uaddw2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister saddl(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister saddl2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister saddw(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister saddw2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister usubl(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister usubl2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister usubw(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister usubw2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister ssubl(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister ssubl2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister ssubw(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister ssubw2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister UMinMax(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1, const LogicVRegister& src2,
+                         bool max);
+  LogicVRegister umax(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister umin(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister UMinMaxP(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src1,
+                          const LogicVRegister& src2, bool max);
+  LogicVRegister umaxp(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister uminp(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister UMinMaxV(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src, bool max);
+  LogicVRegister umaxv(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister uminv(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister trn1(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister trn2(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister zip1(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister zip2(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister uzp1(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister uzp2(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister shl(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src, int shift);
+  LogicVRegister scvtf(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int fbits,
+                       FPRounding rounding_mode);
+  LogicVRegister ucvtf(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int fbits,
+                       FPRounding rounding_mode);
+  LogicVRegister sshll(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int shift);
+  LogicVRegister sshll2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src, int shift);
+  LogicVRegister shll(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src);
+  LogicVRegister shll2(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister ushll(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int shift);
+  LogicVRegister ushll2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src, int shift);
+  LogicVRegister sli(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src, int shift);
+  LogicVRegister sri(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src, int shift);
+  LogicVRegister sshr(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src, int shift);
+  LogicVRegister ushr(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src, int shift);
+  LogicVRegister ssra(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src, int shift);
+  LogicVRegister usra(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src, int shift);
+  LogicVRegister srsra(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int shift);
+  LogicVRegister ursra(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int shift);
+  LogicVRegister suqadd(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister usqadd(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister sqshl(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int shift);
+  LogicVRegister uqshl(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int shift);
+  LogicVRegister sqshlu(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src, int shift);
+  LogicVRegister abs(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src);
+  LogicVRegister neg(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src);
+  LogicVRegister ExtractNarrow(VectorFormat vform, LogicVRegister dst,
+                               bool dstIsSigned, const LogicVRegister& src,
+                               bool srcIsSigned);
+  LogicVRegister xtn(VectorFormat vform, LogicVRegister dst,
+                     const LogicVRegister& src);
+  LogicVRegister sqxtn(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister uqxtn(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister sqxtun(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister AbsDiff(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1, const LogicVRegister& src2,
+                         bool issigned);
+  LogicVRegister saba(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister uaba(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister shrn(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src, int shift);
+  LogicVRegister shrn2(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int shift);
+  LogicVRegister rshrn(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, int shift);
+  LogicVRegister rshrn2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src, int shift);
+  LogicVRegister uqshrn(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src, int shift);
+  LogicVRegister uqshrn2(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src, int shift);
+  LogicVRegister uqrshrn(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src, int shift);
+  LogicVRegister uqrshrn2(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src, int shift);
+  LogicVRegister sqshrn(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src, int shift);
+  LogicVRegister sqshrn2(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src, int shift);
+  LogicVRegister sqrshrn(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src, int shift);
+  LogicVRegister sqrshrn2(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src, int shift);
+  LogicVRegister sqshrun(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src, int shift);
+  LogicVRegister sqshrun2(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src, int shift);
+  LogicVRegister sqrshrun(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src, int shift);
+  LogicVRegister sqrshrun2(VectorFormat vform, LogicVRegister dst,
+                           const LogicVRegister& src, int shift);
+  LogicVRegister sqrdmulh(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src1,
+                          const LogicVRegister& src2, bool round = true);
+  LogicVRegister sqdmulh(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1,
+                         const LogicVRegister& src2);
+#define NEON_3VREG_LOGIC_LIST(V) \
+  V(addhn)                       \
+  V(addhn2)                      \
+  V(raddhn)                      \
+  V(raddhn2)                     \
+  V(subhn)                       \
+  V(subhn2)                      \
+  V(rsubhn)                      \
+  V(rsubhn2)                     \
+  V(pmull)                       \
+  V(pmull2)                      \
+  V(sabal)                       \
+  V(sabal2)                      \
+  V(uabal)                       \
+  V(uabal2)                      \
+  V(sabdl)                       \
+  V(sabdl2)                      \
+  V(uabdl)                       \
+  V(uabdl2)                      \
+  V(smull)                       \
+  V(smull2)                      \
+  V(umull)                       \
+  V(umull2)                      \
+  V(smlal)                       \
+  V(smlal2)                      \
+  V(umlal)                       \
+  V(umlal2)                      \
+  V(smlsl)                       \
+  V(smlsl2)                      \
+  V(umlsl)                       \
+  V(umlsl2)                      \
+  V(sqdmlal)                     \
+  V(sqdmlal2)                    \
+  V(sqdmlsl)                     \
+  V(sqdmlsl2)                    \
+  V(sqdmull)                     \
+  V(sqdmull2)
+
+#define DEFINE_LOGIC_FUNC(FXN)                               \
+  LogicVRegister FXN(VectorFormat vform, LogicVRegister dst, \
+                     const LogicVRegister& src1, const LogicVRegister& src2);
+  NEON_3VREG_LOGIC_LIST(DEFINE_LOGIC_FUNC)
+#undef DEFINE_LOGIC_FUNC
+
+#define NEON_FP3SAME_LIST(V) \
+  V(fadd, FPAdd, false)      \
+  V(fsub, FPSub, true)       \
+  V(fmul, FPMul, true)       \
+  V(fmulx, FPMulx, true)     \
+  V(fdiv, FPDiv, true)       \
+  V(fmax, FPMax, false)      \
+  V(fmin, FPMin, false)      \
+  V(fmaxnm, FPMaxNM, false)  \
+  V(fminnm, FPMinNM, false)
+
+#define DECLARE_NEON_FP_VECTOR_OP(FN, OP, PROCNAN)                           \
+  template <typename T>                                                      \
+  LogicVRegister FN(VectorFormat vform, LogicVRegister dst,                  \
+                    const LogicVRegister& src1, const LogicVRegister& src2); \
+  LogicVRegister FN(VectorFormat vform, LogicVRegister dst,                  \
+                    const LogicVRegister& src1, const LogicVRegister& src2);
+  NEON_FP3SAME_LIST(DECLARE_NEON_FP_VECTOR_OP)
+#undef DECLARE_NEON_FP_VECTOR_OP
+
+#define NEON_FPPAIRWISE_LIST(V) \
+  V(faddp, fadd, FPAdd)         \
+  V(fmaxp, fmax, FPMax)         \
+  V(fmaxnmp, fmaxnm, FPMaxNM)   \
+  V(fminp, fmin, FPMin)         \
+  V(fminnmp, fminnm, FPMinNM)
+
+#define DECLARE_NEON_FP_PAIR_OP(FNP, FN, OP)                                  \
+  LogicVRegister FNP(VectorFormat vform, LogicVRegister dst,                  \
+                     const LogicVRegister& src1, const LogicVRegister& src2); \
+  LogicVRegister FNP(VectorFormat vform, LogicVRegister dst,                  \
+                     const LogicVRegister& src);
+  NEON_FPPAIRWISE_LIST(DECLARE_NEON_FP_PAIR_OP)
+#undef DECLARE_NEON_FP_PAIR_OP
+
+  template <typename T>
+  LogicVRegister frecps(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister frecps(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src1, const LogicVRegister& src2);
+  template <typename T>
+  LogicVRegister frsqrts(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1,
+                         const LogicVRegister& src2);
+  LogicVRegister frsqrts(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1,
+                         const LogicVRegister& src2);
+  template <typename T>
+  LogicVRegister fmla(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister fmla(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  template <typename T>
+  LogicVRegister fmls(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister fmls(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister fnmul(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src1, const LogicVRegister& src2);
+
+  template <typename T>
+  LogicVRegister fcmp(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2,
+                      Condition cond);
+  LogicVRegister fcmp(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2,
+                      Condition cond);
+  LogicVRegister fabscmp(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src1, const LogicVRegister& src2,
+                         Condition cond);
+  LogicVRegister fcmp_zero(VectorFormat vform, LogicVRegister dst,
+                           const LogicVRegister& src, Condition cond);
+
+  template <typename T>
+  LogicVRegister fneg(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src);
+  LogicVRegister fneg(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src);
+  template <typename T>
+  LogicVRegister frecpx(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister frecpx(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  template <typename T>
+  LogicVRegister fabs_(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister fabs_(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister fabd(VectorFormat vform, LogicVRegister dst,
+                      const LogicVRegister& src1, const LogicVRegister& src2);
+  LogicVRegister frint(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, FPRounding rounding_mode,
+                       bool inexact_exception = false);
+  LogicVRegister fcvts(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, FPRounding rounding_mode,
+                       int fbits = 0);
+  LogicVRegister fcvtu(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src, FPRounding rounding_mode,
+                       int fbits = 0);
+  LogicVRegister fcvtl(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister fcvtl2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister fcvtn(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister fcvtn2(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister fcvtxn(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+  LogicVRegister fcvtxn2(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src);
+  LogicVRegister fsqrt(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister frsqrte(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src);
+  LogicVRegister frecpe(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src, FPRounding rounding);
+  LogicVRegister ursqrte(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src);
+  LogicVRegister urecpe(VectorFormat vform, LogicVRegister dst,
+                        const LogicVRegister& src);
+
+  typedef float (Simulator::*FPMinMaxOp)(float a, float b);
+
+  LogicVRegister FMinMaxV(VectorFormat vform, LogicVRegister dst,
+                          const LogicVRegister& src, FPMinMaxOp Op);
+
+  LogicVRegister fminv(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister fmaxv(VectorFormat vform, LogicVRegister dst,
+                       const LogicVRegister& src);
+  LogicVRegister fminnmv(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src);
+  LogicVRegister fmaxnmv(VectorFormat vform, LogicVRegister dst,
+                         const LogicVRegister& src);
+
+  template <typename T>
+  T FPRecipSqrtEstimate(T op);
+  template <typename T>
+  T FPRecipEstimate(T op, FPRounding rounding);
+  template <typename T, typename R>
+  R FPToFixed(T op, int fbits, bool is_signed, FPRounding rounding);
 
   void FPCompare(double val0, double val1);
   double FPRoundInt(double value, FPRounding round_mode);
   double FPToDouble(float value);
   float FPToFloat(double value, FPRounding round_mode);
+  float FPToFloat(float16 value);
+  float16 FPToFloat16(float value, FPRounding round_mode);
+  float16 FPToFloat16(double value, FPRounding round_mode);
+  double recip_sqrt_estimate(double a);
+  double recip_estimate(double a);
+  double FPRecipSqrtEstimate(double a);
+  double FPRecipEstimate(double a);
   double FixedToDouble(int64_t src, int fbits, FPRounding round_mode);
   double UFixedToDouble(uint64_t src, int fbits, FPRounding round_mode);
   float FixedToFloat(int64_t src, int fbits, FPRounding round_mode);
   float UFixedToFloat(uint64_t src, int fbits, FPRounding round_mode);
   int32_t FPToInt32(double value, FPRounding rmode);
   int64_t FPToInt64(double value, FPRounding rmode);
   uint32_t FPToUInt32(double value, FPRounding rmode);
   uint64_t FPToUInt64(double value, FPRounding rmode);
 
   template <typename T>
@@ skipping 11 matching lines @@
   template <typename T>
   T FPMin(T a, T b);
 
   template <typename T>
   T FPMinNM(T a, T b);
 
   template <typename T>
   T FPMul(T op1, T op2);
 
   template <typename T>
+  T FPMulx(T op1, T op2);
+
+  template <typename T>
   T FPMulAdd(T a, T op1, T op2);
 
   template <typename T>
   T FPSqrt(T op);
 
   template <typename T>
   T FPSub(T op1, T op2);
 
-  // Standard NaN processing.
   template <typename T>
-  T FPProcessNaN(T op);
-
-  bool FPProcessNaNs(Instruction* instr);
+  T FPRecipStepFused(T op1, T op2);
 
   template <typename T>
-  T FPProcessNaNs(T op1, T op2);
+  T FPRSqrtStepFused(T op1, T op2);
 
-  template <typename T>
-  T FPProcessNaNs3(T op1, T op2, T op3);
+  // This doesn't do anything at the moment. We'll need it if we want support
+  // for cumulative exception bits or floating-point exceptions.
+  void FPProcessException() {}
+
+  // Standard NaN processing.
+  bool FPProcessNaNs(Instruction* instr);
 
   void CheckStackAlignment();
 
   inline void CheckPCSComplianceAndRun();
 
 #ifdef DEBUG
   // Corruption values should have their least significant byte cleared to
   // allow the code of the register being corrupted to be inserted.
   static const uint64_t kCallerSavedRegisterCorruptionValue =
       0xca11edc0de000000UL;
   // This value is a NaN in both 32-bit and 64-bit FP.
-  static const uint64_t kCallerSavedFPRegisterCorruptionValue =
+  static const uint64_t kCallerSavedVRegisterCorruptionValue =
       0x7ff000007f801000UL;
   // This value is a mix of 32/64-bits NaN and "verbose" immediate.
   static const uint64_t kDefaultCPURegisterCorruptionValue =
       0x7ffbad007f8bad00UL;
 
   void CorruptRegisters(CPURegList* list,
                         uint64_t value = kDefaultCPURegisterCorruptionValue);
   void CorruptAllCallerSavedCPURegisters();
 #endif
 
   // Pseudo Printf instruction
   void DoPrintf(Instruction* instr);
 
   // Processor state ---------------------------------------
 
   // Output stream.
   FILE* stream_;
   PrintDisassembler* print_disasm_;
   void PRINTF_FORMAT(2, 3) TraceSim(const char* format, ...);
 
   // Instrumentation.
   Instrument* instrument_;
 
   // General purpose registers. Register 31 is the stack pointer.
   SimRegister registers_[kNumberOfRegisters];
 
   // Floating point registers
-  SimFPRegister fpregisters_[kNumberOfFPRegisters];
+  SimVRegister vregisters_[kNumberOfVRegisters];
 
   // Processor state
   // bits[31, 27]: Condition flags N, Z, C, and V.
   //               (Negative, Zero, Carry, Overflow)
   SimSystemRegister nzcv_;
 
   // Floating-Point Control Register
   SimSystemRegister fpcr_;
 
   // Only a subset of FPCR features are supported by the simulator. This helper
@@ skipping 137 matching lines @@
     Processor* head_;
   };
 
   LocalMonitor local_monitor_;
   GlobalMonitor::Processor global_monitor_processor_;
   static base::LazyInstance<GlobalMonitor>::type global_monitor_;
 
  private:
   void Init(FILE* stream);
 
+  template <typename T>
+  static T FPDefaultNaN();
+
+  template <typename T>
+  T FPProcessNaN(T op) {
+    DCHECK(std::isnan(op));
+    return fpcr().DN() ? FPDefaultNaN<T>() : ToQuietNaN(op);
+  }
+
+  template <typename T>
+  T FPProcessNaNs(T op1, T op2) {
+    if (IsSignallingNaN(op1)) {
+      return FPProcessNaN(op1);
+    } else if (IsSignallingNaN(op2)) {
+      return FPProcessNaN(op2);
+    } else if (std::isnan(op1)) {
+      DCHECK(IsQuietNaN(op1));
+      return FPProcessNaN(op1);
+    } else if (std::isnan(op2)) {
+      DCHECK(IsQuietNaN(op2));
+      return FPProcessNaN(op2);
+    } else {
+      return 0.0;
+    }
+  }
+
+  template <typename T>
+  T FPProcessNaNs3(T op1, T op2, T op3) {
+    if (IsSignallingNaN(op1)) {
+      return FPProcessNaN(op1);
+    } else if (IsSignallingNaN(op2)) {
+      return FPProcessNaN(op2);
+    } else if (IsSignallingNaN(op3)) {
+      return FPProcessNaN(op3);
+    } else if (std::isnan(op1)) {
+      DCHECK(IsQuietNaN(op1));
+      return FPProcessNaN(op1);
+    } else if (std::isnan(op2)) {
+      DCHECK(IsQuietNaN(op2));
+      return FPProcessNaN(op2);
+    } else if (std::isnan(op3)) {
+      DCHECK(IsQuietNaN(op3));
+      return FPProcessNaN(op3);
+    } else {
+      return 0.0;
+    }
+  }
+
   int  log_parameters_;
   Isolate* isolate_;
 };
 
+template <>
+inline double Simulator::FPDefaultNaN<double>() {
+  return kFP64DefaultNaN;
+}
+
+template <>
+inline float Simulator::FPDefaultNaN<float>() {
+  return kFP32DefaultNaN;
+}
 
 // When running with the simulator transition into simulated execution at this
 // point.
 #define CALL_GENERATED_CODE(isolate, entry, p0, p1, p2, p3, p4)  \
   reinterpret_cast<Object*>(Simulator::current(isolate)->CallJS( \
       FUNCTION_ADDR(entry), p0, p1, p2, p3, p4))
 
 #define CALL_GENERATED_REGEXP_CODE(isolate, entry, p0, p1, p2, p3, p4, p5, p6, \
                                    p7, p8)                                     \
   static_cast<int>(Simulator::current(isolate)->CallRegExp(                    \
@@ skipping 20 matching lines @@
     Simulator::current(isolate)->PopAddress();
   }
 };
 
 #endif  // !defined(USE_SIMULATOR)
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM64_SIMULATOR_ARM64_H_