Reland of Reland of "ARM64: Add NEON support"

src/arm64/simulator-logic-arm64.cc

+// Copyright 2016 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.
+
+#if V8_TARGET_ARCH_ARM64
+
+#include <cmath>
+#include "src/arm64/simulator-arm64.h"
+
+namespace v8 {
+namespace internal {
+
+#if defined(USE_SIMULATOR)
+
+namespace {
+
+// See FPRound for a description of this function.
+inline double FPRoundToDouble(int64_t sign, int64_t exponent, uint64_t mantissa,
+                              FPRounding round_mode) {
+  uint64_t bits = FPRound<uint64_t, kDoubleExponentBits, kDoubleMantissaBits>(
+      sign, exponent, mantissa, round_mode);
+  return bit_cast<double>(bits);
+}
+
+// See FPRound for a description of this function.
+inline float FPRoundToFloat(int64_t sign, int64_t exponent, uint64_t mantissa,
+                            FPRounding round_mode) {
+  uint32_t bits = FPRound<uint32_t, kFloatExponentBits, kFloatMantissaBits>(
+      sign, exponent, mantissa, round_mode);
+  return bit_cast<float>(bits);
+}
+
+// See FPRound for a description of this function.
+inline float16 FPRoundToFloat16(int64_t sign, int64_t exponent,
+                                uint64_t mantissa, FPRounding round_mode) {
+  return FPRound<float16, kFloat16ExponentBits, kFloat16MantissaBits>(
+      sign, exponent, mantissa, round_mode);
+}
+
+}  // namespace
+
+double Simulator::FixedToDouble(int64_t src, int fbits, FPRounding round) {
+  if (src >= 0) {
+    return UFixedToDouble(src, fbits, round);
+  } else if (src == INT64_MIN) {
+    return -UFixedToDouble(src, fbits, round);
+  } else {
+    return -UFixedToDouble(-src, fbits, round);
+  }
+}
+
+double Simulator::UFixedToDouble(uint64_t src, int fbits, FPRounding round) {
+  // An input of 0 is a special case because the result is effectively
+  // subnormal: The exponent is encoded as 0 and there is no implicit 1 bit.
+  if (src == 0) {
+    return 0.0;
+  }
+
+  // Calculate the exponent. The highest significant bit will have the value
+  // 2^exponent.
+  const int highest_significant_bit = 63 - CountLeadingZeros(src, 64);
+  const int64_t exponent = highest_significant_bit - fbits;
+
+  return FPRoundToDouble(0, exponent, src, round);
+}
+
+float Simulator::FixedToFloat(int64_t src, int fbits, FPRounding round) {
+  if (src >= 0) {
+    return UFixedToFloat(src, fbits, round);
+  } else if (src == INT64_MIN) {
+    return -UFixedToFloat(src, fbits, round);
+  } else {
+    return -UFixedToFloat(-src, fbits, round);
+  }
+}
+
+float Simulator::UFixedToFloat(uint64_t src, int fbits, FPRounding round) {
+  // An input of 0 is a special case because the result is effectively
+  // subnormal: The exponent is encoded as 0 and there is no implicit 1 bit.
+  if (src == 0) {
+    return 0.0f;
+  }
+
+  // Calculate the exponent. The highest significant bit will have the value
+  // 2^exponent.
+  const int highest_significant_bit = 63 - CountLeadingZeros(src, 64);
+  const int32_t exponent = highest_significant_bit - fbits;
+
+  return FPRoundToFloat(0, exponent, src, round);
+}
+
+double Simulator::FPToDouble(float value) {
+  switch (std::fpclassify(value)) {
+    case FP_NAN: {
+      if (IsSignallingNaN(value)) {
+        FPProcessException();
+      }
+      if (DN()) return kFP64DefaultNaN;
+
+      // Convert NaNs as the processor would:
+      //  - The sign is propagated.
+      //  - The mantissa is transferred entirely, except that the top bit is
+      //    forced to '1', making the result a quiet NaN. The unused (low-order)
+      //    mantissa bits are set to 0.
+      uint32_t raw = bit_cast<uint32_t>(value);
+
+      uint64_t sign = raw >> 31;
+      uint64_t exponent = (1 << kDoubleExponentBits) - 1;
+      uint64_t mantissa = unsigned_bitextract_64(21, 0, raw);
+
+      // Unused low-order bits remain zero.
+      mantissa <<= (kDoubleMantissaBits - kFloatMantissaBits);
+
+      // Force a quiet NaN.
+      mantissa |= (UINT64_C(1) << (kDoubleMantissaBits - 1));
+
+      return double_pack(sign, exponent, mantissa);
+    }
+
+    case FP_ZERO:
+    case FP_NORMAL:
+    case FP_SUBNORMAL:
+    case FP_INFINITE: {
+      // All other inputs are preserved in a standard cast, because every value
+      // representable using an IEEE-754 float is also representable using an
+      // IEEE-754 double.
+      return static_cast<double>(value);
+    }
+  }
+
+  UNREACHABLE();
+}
+
+float Simulator::FPToFloat(float16 value) {
+  uint32_t sign = value >> 15;
+  uint32_t exponent =
+      unsigned_bitextract_32(kFloat16MantissaBits + kFloat16ExponentBits - 1,
+                             kFloat16MantissaBits, value);
+  uint32_t mantissa =
+      unsigned_bitextract_32(kFloat16MantissaBits - 1, 0, value);
+
+  switch (float16classify(value)) {
+    case FP_ZERO:
+      return (sign == 0) ? 0.0f : -0.0f;
+
+    case FP_INFINITE:
+      return (sign == 0) ? kFP32PositiveInfinity : kFP32NegativeInfinity;
+
+    case FP_SUBNORMAL: {
+      // Calculate shift required to put mantissa into the most-significant bits
+      // of the destination mantissa.
+      int shift = CountLeadingZeros(mantissa << (32 - 10), 32);
+
+      // Shift mantissa and discard implicit '1'.
+      mantissa <<= (kFloatMantissaBits - kFloat16MantissaBits) + shift + 1;
+      mantissa &= (1 << kFloatMantissaBits) - 1;
+
+      // Adjust the exponent for the shift applied, and rebias.
+      exponent = exponent - shift + (kFloatExponentBias - kFloat16ExponentBias);
+      break;
+    }
+
+    case FP_NAN: {
+      if (IsSignallingNaN(value)) {
+        FPProcessException();
+      }
+      if (DN()) return kFP32DefaultNaN;
+
+      // Convert NaNs as the processor would:
+      //  - The sign is propagated.
+      //  - The mantissa is transferred entirely, except that the top bit is
+      //    forced to '1', making the result a quiet NaN. The unused (low-order)
+      //    mantissa bits are set to 0.
+      exponent = (1 << kFloatExponentBits) - 1;
+
+      // Increase bits in mantissa, making low-order bits 0.
+      mantissa <<= (kFloatMantissaBits - kFloat16MantissaBits);
+      mantissa |= 1 << (kFloatMantissaBits - 1);  // Force a quiet NaN.
+      break;
+    }
+
+    case FP_NORMAL: {
+      // Increase bits in mantissa, making low-order bits 0.
+      mantissa <<= (kFloatMantissaBits - kFloat16MantissaBits);
+
+      // Change exponent bias.
+      exponent += (kFloatExponentBias - kFloat16ExponentBias);
+      break;
+    }
+
+    default:
+      UNREACHABLE();
+  }
+  return float_pack(sign, exponent, mantissa);
+}
+
+float16 Simulator::FPToFloat16(float value, FPRounding round_mode) {
+  // Only the FPTieEven rounding mode is implemented.
+  DCHECK_EQ(round_mode, FPTieEven);
+  USE(round_mode);
+
+  int64_t sign = float_sign(value);
+  int64_t exponent =
+      static_cast<int64_t>(float_exp(value)) - kFloatExponentBias;
+  uint32_t mantissa = float_mantissa(value);
+
+  switch (std::fpclassify(value)) {
+    case FP_NAN: {
+      if (IsSignallingNaN(value)) {
+        FPProcessException();
+      }
+      if (DN()) return kFP16DefaultNaN;
+
+      // Convert NaNs as the processor would:
+      //  - The sign is propagated.
+      //  - The mantissa is transferred as much as possible, except that the top
+      //    bit is forced to '1', making the result a quiet NaN.
+      float16 result =
+          (sign == 0) ? kFP16PositiveInfinity : kFP16NegativeInfinity;
+      result |= mantissa >> (kFloatMantissaBits - kFloat16MantissaBits);
+      result |= (1 << (kFloat16MantissaBits - 1));  // Force a quiet NaN;
+      return result;
+    }
+
+    case FP_ZERO:
+      return (sign == 0) ? 0 : 0x8000;
+
+    case FP_INFINITE:
+      return (sign == 0) ? kFP16PositiveInfinity : kFP16NegativeInfinity;
+
+    case FP_NORMAL:
+    case FP_SUBNORMAL: {
+      // Convert float-to-half as the processor would, assuming that FPCR.FZ
+      // (flush-to-zero) is not set.
+
+      // Add the implicit '1' bit to the mantissa.
+      mantissa += (1 << kFloatMantissaBits);
+      return FPRoundToFloat16(sign, exponent, mantissa, round_mode);
+    }
+  }
+
+  UNREACHABLE();
+}
+
+float16 Simulator::FPToFloat16(double value, FPRounding round_mode) {
+  // Only the FPTieEven rounding mode is implemented.
+  DCHECK_EQ(round_mode, FPTieEven);
+  USE(round_mode);
+
+  int64_t sign = double_sign(value);
+  int64_t exponent =
+      static_cast<int64_t>(double_exp(value)) - kDoubleExponentBias;
+  uint64_t mantissa = double_mantissa(value);
+
+  switch (std::fpclassify(value)) {
+    case FP_NAN: {
+      if (IsSignallingNaN(value)) {
+        FPProcessException();
+      }
+      if (DN()) return kFP16DefaultNaN;
+
+      // Convert NaNs as the processor would:
+      //  - The sign is propagated.
+      //  - The mantissa is transferred as much as possible, except that the top
+      //    bit is forced to '1', making the result a quiet NaN.
+      float16 result =
+          (sign == 0) ? kFP16PositiveInfinity : kFP16NegativeInfinity;
+      result |= mantissa >> (kDoubleMantissaBits - kFloat16MantissaBits);
+      result |= (1 << (kFloat16MantissaBits - 1));  // Force a quiet NaN;
+      return result;
+    }
+
+    case FP_ZERO:
+      return (sign == 0) ? 0 : 0x8000;
+
+    case FP_INFINITE:
+      return (sign == 0) ? kFP16PositiveInfinity : kFP16NegativeInfinity;
+
+    case FP_NORMAL:
+    case FP_SUBNORMAL: {
+      // Convert double-to-half as the processor would, assuming that FPCR.FZ
+      // (flush-to-zero) is not set.
+
+      // Add the implicit '1' bit to the mantissa.
+      mantissa += (UINT64_C(1) << kDoubleMantissaBits);
+      return FPRoundToFloat16(sign, exponent, mantissa, round_mode);
+    }
+  }
+
+  UNREACHABLE();
+}
+
+float Simulator::FPToFloat(double value, FPRounding round_mode) {
+  // Only the FPTieEven rounding mode is implemented.
+  DCHECK((round_mode == FPTieEven) || (round_mode == FPRoundOdd));
+  USE(round_mode);
+
+  switch (std::fpclassify(value)) {
+    case FP_NAN: {
+      if (IsSignallingNaN(value)) {
+        FPProcessException();
+      }
+      if (DN()) return kFP32DefaultNaN;
+
+      // Convert NaNs as the processor would:
+      //  - The sign is propagated.
+      //  - The mantissa is transferred as much as possible, except that the
+      //    top bit is forced to '1', making the result a quiet NaN.
+
+      uint64_t raw = bit_cast<uint64_t>(value);
+
+      uint32_t sign = raw >> 63;
+      uint32_t exponent = (1 << 8) - 1;
+      uint32_t mantissa = static_cast<uint32_t>(unsigned_bitextract_64(
+          50, kDoubleMantissaBits - kFloatMantissaBits, raw));
+      mantissa |= (1 << (kFloatMantissaBits - 1));  // Force a quiet NaN.
+
+      return float_pack(sign, exponent, mantissa);
+    }
+
+    case FP_ZERO:
+    case FP_INFINITE: {
+      // In a C++ cast, any value representable in the target type will be
+      // unchanged. This is always the case for +/-0.0 and infinities.
+      return static_cast<float>(value);
+    }
+
+    case FP_NORMAL:
+    case FP_SUBNORMAL: {
+      // Convert double-to-float as the processor would, assuming that FPCR.FZ
+      // (flush-to-zero) is not set.
+      uint32_t sign = double_sign(value);
+      int64_t exponent =
+          static_cast<int64_t>(double_exp(value)) - kDoubleExponentBias;
+      uint64_t mantissa = double_mantissa(value);
+      if (std::fpclassify(value) == FP_NORMAL) {
+        // For normal FP values, add the hidden bit.
+        mantissa |= (UINT64_C(1) << kDoubleMantissaBits);
+      }
+      return FPRoundToFloat(sign, exponent, mantissa, round_mode);
+    }
+  }
+
+  UNREACHABLE();
+}
+
+void Simulator::ld1(VectorFormat vform, LogicVRegister dst, uint64_t addr) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.ReadUintFromMem(vform, i, addr);
+    addr += LaneSizeInBytesFromFormat(vform);
+  }
+}
+
+void Simulator::ld1(VectorFormat vform, LogicVRegister dst, int index,
+                    uint64_t addr) {
+  dst.ReadUintFromMem(vform, index, addr);
+}
+
+void Simulator::ld1r(VectorFormat vform, LogicVRegister dst, uint64_t addr) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.ReadUintFromMem(vform, i, addr);
+  }
+}
+
+void Simulator::ld2(VectorFormat vform, LogicVRegister dst1,
+                    LogicVRegister dst2, uint64_t addr1) {
+  dst1.ClearForWrite(vform);
+  dst2.ClearForWrite(vform);
+  int esize = LaneSizeInBytesFromFormat(vform);
+  uint64_t addr2 = addr1 + esize;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst1.ReadUintFromMem(vform, i, addr1);
+    dst2.ReadUintFromMem(vform, i, addr2);
+    addr1 += 2 * esize;
+    addr2 += 2 * esize;
+  }
+}
+
+void Simulator::ld2(VectorFormat vform, LogicVRegister dst1,
+                    LogicVRegister dst2, int index, uint64_t addr1) {
+  dst1.ClearForWrite(vform);
+  dst2.ClearForWrite(vform);
+  uint64_t addr2 = addr1 + LaneSizeInBytesFromFormat(vform);
+  dst1.ReadUintFromMem(vform, index, addr1);
+  dst2.ReadUintFromMem(vform, index, addr2);
+}
+
+void Simulator::ld2r(VectorFormat vform, LogicVRegister dst1,
+                     LogicVRegister dst2, uint64_t addr) {
+  dst1.ClearForWrite(vform);
+  dst2.ClearForWrite(vform);
+  uint64_t addr2 = addr + LaneSizeInBytesFromFormat(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst1.ReadUintFromMem(vform, i, addr);
+    dst2.ReadUintFromMem(vform, i, addr2);
+  }
+}
+
+void Simulator::ld3(VectorFormat vform, LogicVRegister dst1,
+                    LogicVRegister dst2, LogicVRegister dst3, uint64_t addr1) {
+  dst1.ClearForWrite(vform);
+  dst2.ClearForWrite(vform);
+  dst3.ClearForWrite(vform);
+  int esize = LaneSizeInBytesFromFormat(vform);
+  uint64_t addr2 = addr1 + esize;
+  uint64_t addr3 = addr2 + esize;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst1.ReadUintFromMem(vform, i, addr1);
+    dst2.ReadUintFromMem(vform, i, addr2);
+    dst3.ReadUintFromMem(vform, i, addr3);
+    addr1 += 3 * esize;
+    addr2 += 3 * esize;
+    addr3 += 3 * esize;
+  }
+}
+
+void Simulator::ld3(VectorFormat vform, LogicVRegister dst1,
+                    LogicVRegister dst2, LogicVRegister dst3, int index,
+                    uint64_t addr1) {
+  dst1.ClearForWrite(vform);
+  dst2.ClearForWrite(vform);
+  dst3.ClearForWrite(vform);
+  uint64_t addr2 = addr1 + LaneSizeInBytesFromFormat(vform);
+  uint64_t addr3 = addr2 + LaneSizeInBytesFromFormat(vform);
+  dst1.ReadUintFromMem(vform, index, addr1);
+  dst2.ReadUintFromMem(vform, index, addr2);
+  dst3.ReadUintFromMem(vform, index, addr3);
+}
+
+void Simulator::ld3r(VectorFormat vform, LogicVRegister dst1,
+                     LogicVRegister dst2, LogicVRegister dst3, uint64_t addr) {
+  dst1.ClearForWrite(vform);
+  dst2.ClearForWrite(vform);
+  dst3.ClearForWrite(vform);
+  uint64_t addr2 = addr + LaneSizeInBytesFromFormat(vform);
+  uint64_t addr3 = addr2 + LaneSizeInBytesFromFormat(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst1.ReadUintFromMem(vform, i, addr);
+    dst2.ReadUintFromMem(vform, i, addr2);
+    dst3.ReadUintFromMem(vform, i, addr3);
+  }
+}
+
+void Simulator::ld4(VectorFormat vform, LogicVRegister dst1,
+                    LogicVRegister dst2, LogicVRegister dst3,
+                    LogicVRegister dst4, uint64_t addr1) {
+  dst1.ClearForWrite(vform);
+  dst2.ClearForWrite(vform);
+  dst3.ClearForWrite(vform);
+  dst4.ClearForWrite(vform);
+  int esize = LaneSizeInBytesFromFormat(vform);
+  uint64_t addr2 = addr1 + esize;
+  uint64_t addr3 = addr2 + esize;
+  uint64_t addr4 = addr3 + esize;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst1.ReadUintFromMem(vform, i, addr1);
+    dst2.ReadUintFromMem(vform, i, addr2);
+    dst3.ReadUintFromMem(vform, i, addr3);
+    dst4.ReadUintFromMem(vform, i, addr4);
+    addr1 += 4 * esize;
+    addr2 += 4 * esize;
+    addr3 += 4 * esize;
+    addr4 += 4 * esize;
+  }
+}
+
+void Simulator::ld4(VectorFormat vform, LogicVRegister dst1,
+                    LogicVRegister dst2, LogicVRegister dst3,
+                    LogicVRegister dst4, int index, uint64_t addr1) {
+  dst1.ClearForWrite(vform);
+  dst2.ClearForWrite(vform);
+  dst3.ClearForWrite(vform);
+  dst4.ClearForWrite(vform);
+  uint64_t addr2 = addr1 + LaneSizeInBytesFromFormat(vform);
+  uint64_t addr3 = addr2 + LaneSizeInBytesFromFormat(vform);
+  uint64_t addr4 = addr3 + LaneSizeInBytesFromFormat(vform);
+  dst1.ReadUintFromMem(vform, index, addr1);
+  dst2.ReadUintFromMem(vform, index, addr2);
+  dst3.ReadUintFromMem(vform, index, addr3);
+  dst4.ReadUintFromMem(vform, index, addr4);
+}
+
+void Simulator::ld4r(VectorFormat vform, LogicVRegister dst1,
+                     LogicVRegister dst2, LogicVRegister dst3,
+                     LogicVRegister dst4, uint64_t addr) {
+  dst1.ClearForWrite(vform);
+  dst2.ClearForWrite(vform);
+  dst3.ClearForWrite(vform);
+  dst4.ClearForWrite(vform);
+  uint64_t addr2 = addr + LaneSizeInBytesFromFormat(vform);
+  uint64_t addr3 = addr2 + LaneSizeInBytesFromFormat(vform);
+  uint64_t addr4 = addr3 + LaneSizeInBytesFromFormat(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst1.ReadUintFromMem(vform, i, addr);
+    dst2.ReadUintFromMem(vform, i, addr2);
+    dst3.ReadUintFromMem(vform, i, addr3);
+    dst4.ReadUintFromMem(vform, i, addr4);
+  }
+}
+
+void Simulator::st1(VectorFormat vform, LogicVRegister src, uint64_t addr) {
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    src.WriteUintToMem(vform, i, addr);
+    addr += LaneSizeInBytesFromFormat(vform);
+  }
+}
+
+void Simulator::st1(VectorFormat vform, LogicVRegister src, int index,
+                    uint64_t addr) {
+  src.WriteUintToMem(vform, index, addr);
+}
+
+void Simulator::st2(VectorFormat vform, LogicVRegister dst, LogicVRegister dst2,
+                    uint64_t addr) {
+  int esize = LaneSizeInBytesFromFormat(vform);
+  uint64_t addr2 = addr + esize;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.WriteUintToMem(vform, i, addr);
+    dst2.WriteUintToMem(vform, i, addr2);
+    addr += 2 * esize;
+    addr2 += 2 * esize;
+  }
+}
+
+void Simulator::st2(VectorFormat vform, LogicVRegister dst, LogicVRegister dst2,
+                    int index, uint64_t addr) {
+  int esize = LaneSizeInBytesFromFormat(vform);
+  dst.WriteUintToMem(vform, index, addr);
+  dst2.WriteUintToMem(vform, index, addr + 1 * esize);
+}
+
+void Simulator::st3(VectorFormat vform, LogicVRegister dst, LogicVRegister dst2,
+                    LogicVRegister dst3, uint64_t addr) {
+  int esize = LaneSizeInBytesFromFormat(vform);
+  uint64_t addr2 = addr + esize;
+  uint64_t addr3 = addr2 + esize;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.WriteUintToMem(vform, i, addr);
+    dst2.WriteUintToMem(vform, i, addr2);
+    dst3.WriteUintToMem(vform, i, addr3);
+    addr += 3 * esize;
+    addr2 += 3 * esize;
+    addr3 += 3 * esize;
+  }
+}
+
+void Simulator::st3(VectorFormat vform, LogicVRegister dst, LogicVRegister dst2,
+                    LogicVRegister dst3, int index, uint64_t addr) {
+  int esize = LaneSizeInBytesFromFormat(vform);
+  dst.WriteUintToMem(vform, index, addr);
+  dst2.WriteUintToMem(vform, index, addr + 1 * esize);
+  dst3.WriteUintToMem(vform, index, addr + 2 * esize);
+}
+
+void Simulator::st4(VectorFormat vform, LogicVRegister dst, LogicVRegister dst2,
+                    LogicVRegister dst3, LogicVRegister dst4, uint64_t addr) {
+  int esize = LaneSizeInBytesFromFormat(vform);
+  uint64_t addr2 = addr + esize;
+  uint64_t addr3 = addr2 + esize;
+  uint64_t addr4 = addr3 + esize;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.WriteUintToMem(vform, i, addr);
+    dst2.WriteUintToMem(vform, i, addr2);
+    dst3.WriteUintToMem(vform, i, addr3);
+    dst4.WriteUintToMem(vform, i, addr4);
+    addr += 4 * esize;
+    addr2 += 4 * esize;
+    addr3 += 4 * esize;
+    addr4 += 4 * esize;
+  }
+}
+
+void Simulator::st4(VectorFormat vform, LogicVRegister dst, LogicVRegister dst2,
+                    LogicVRegister dst3, LogicVRegister dst4, int index,
+                    uint64_t addr) {
+  int esize = LaneSizeInBytesFromFormat(vform);
+  dst.WriteUintToMem(vform, index, addr);
+  dst2.WriteUintToMem(vform, index, addr + 1 * esize);
+  dst3.WriteUintToMem(vform, index, addr + 2 * esize);
+  dst4.WriteUintToMem(vform, index, addr + 3 * esize);
+}
+
+LogicVRegister Simulator::cmp(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2, Condition cond) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    int64_t sa = src1.Int(vform, i);
+    int64_t sb = src2.Int(vform, i);
+    uint64_t ua = src1.Uint(vform, i);
+    uint64_t ub = src2.Uint(vform, i);
+    bool result = false;
+    switch (cond) {
+      case eq:
+        result = (ua == ub);
+        break;
+      case ge:
+        result = (sa >= sb);
+        break;
+      case gt:
+        result = (sa > sb);
+        break;
+      case hi:
+        result = (ua > ub);
+        break;
+      case hs:
+        result = (ua >= ub);
+        break;
+      case lt:
+        result = (sa < sb);
+        break;
+      case le:
+        result = (sa <= sb);
+        break;
+      default:
+        UNREACHABLE();
+    }
+    dst.SetUint(vform, i, result ? MaxUintFromFormat(vform) : 0);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::cmp(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1, int imm,
+                              Condition cond) {
+  SimVRegister temp;
+  LogicVRegister imm_reg = dup_immediate(vform, temp, imm);
+  return cmp(vform, dst, src1, imm_reg, cond);
+}
+
+LogicVRegister Simulator::cmptst(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    uint64_t ua = src1.Uint(vform, i);
+    uint64_t ub = src2.Uint(vform, i);
+    dst.SetUint(vform, i, ((ua & ub) != 0) ? MaxUintFromFormat(vform) : 0);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::add(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  int lane_size = LaneSizeInBitsFromFormat(vform);
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    // Test for unsigned saturation.
+    uint64_t ua = src1.UintLeftJustified(vform, i);
+    uint64_t ub = src2.UintLeftJustified(vform, i);
+    uint64_t ur = ua + ub;
+    if (ur < ua) {
+      dst.SetUnsignedSat(i, true);
+    }
+
+    // Test for signed saturation.
+    bool pos_a = (ua >> 63) == 0;
+    bool pos_b = (ub >> 63) == 0;
+    bool pos_r = (ur >> 63) == 0;
+    // If the signs of the operands are the same, but different from the result,
+    // there was an overflow.
+    if ((pos_a == pos_b) && (pos_a != pos_r)) {
+      dst.SetSignedSat(i, pos_a);
+    }
+
+    dst.SetInt(vform, i, ur >> (64 - lane_size));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::addp(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uzp1(vform, temp1, src1, src2);
+  uzp2(vform, temp2, src1, src2);
+  add(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::mla(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  SimVRegister temp;
+  mul(vform, temp, src1, src2);
+  add(vform, dst, dst, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::mls(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  SimVRegister temp;
+  mul(vform, temp, src1, src2);
+  sub(vform, dst, dst, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::mul(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(vform, i, src1.Uint(vform, i) * src2.Uint(vform, i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::mul(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform = VectorFormatFillQ(vform);
+  return mul(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::mla(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform = VectorFormatFillQ(vform);
+  return mla(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::mls(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform = VectorFormatFillQ(vform);
+  return mls(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::smull(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return smull(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::smull2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return smull2(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::umull(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return umull(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::umull2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return umull2(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::smlal(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return smlal(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::smlal2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return smlal2(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::umlal(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return umlal(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::umlal2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return umlal2(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::smlsl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return smlsl(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::smlsl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return smlsl2(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::umlsl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return umlsl(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::umlsl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return umlsl2(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::sqdmull(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return sqdmull(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::sqdmull2(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return sqdmull2(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::sqdmlal(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return sqdmlal(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::sqdmlal2(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return sqdmlal2(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::sqdmlsl(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return sqdmlsl(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::sqdmlsl2(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform =
+      VectorFormatHalfWidthDoubleLanes(VectorFormatFillQ(vform));
+  return sqdmlsl2(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::sqdmulh(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform = VectorFormatFillQ(vform);
+  return sqdmulh(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+LogicVRegister Simulator::sqrdmulh(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2, int index) {
+  SimVRegister temp;
+  VectorFormat indexform = VectorFormatFillQ(vform);
+  return sqrdmulh(vform, dst, src1, dup_element(indexform, temp, src2, index));
+}
+
+uint16_t Simulator::PolynomialMult(uint8_t op1, uint8_t op2) {
+  uint16_t result = 0;
+  uint16_t extended_op2 = op2;
+  for (int i = 0; i < 8; ++i) {
+    if ((op1 >> i) & 1) {
+      result = result ^ (extended_op2 << i);
+    }
+  }
+  return result;
+}
+
+LogicVRegister Simulator::pmul(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(vform, i,
+                PolynomialMult(src1.Uint(vform, i), src2.Uint(vform, i)));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::pmull(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  VectorFormat vform_src = VectorFormatHalfWidth(vform);
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(
+        vform, i,
+        PolynomialMult(src1.Uint(vform_src, i), src2.Uint(vform_src, i)));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::pmull2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  VectorFormat vform_src = VectorFormatHalfWidthDoubleLanes(vform);
+  dst.ClearForWrite(vform);
+  int lane_count = LaneCountFromFormat(vform);
+  for (int i = 0; i < lane_count; i++) {
+    dst.SetUint(vform, i,
+                PolynomialMult(src1.Uint(vform_src, lane_count + i),
+                               src2.Uint(vform_src, lane_count + i)));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::sub(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  int lane_size = LaneSizeInBitsFromFormat(vform);
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    // Test for unsigned saturation.
+    uint64_t ua = src1.UintLeftJustified(vform, i);
+    uint64_t ub = src2.UintLeftJustified(vform, i);
+    uint64_t ur = ua - ub;
+    if (ub > ua) {
+      dst.SetUnsignedSat(i, false);
+    }
+
+    // Test for signed saturation.
+    bool pos_a = (ua >> 63) == 0;
+    bool pos_b = (ub >> 63) == 0;
+    bool pos_r = (ur >> 63) == 0;
+    // If the signs of the operands are different, and the sign of the first
+    // operand doesn't match the result, there was an overflow.
+    if ((pos_a != pos_b) && (pos_a != pos_r)) {
+      dst.SetSignedSat(i, pos_a);
+    }
+
+    dst.SetInt(vform, i, ur >> (64 - lane_size));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::and_(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(vform, i, src1.Uint(vform, i) & src2.Uint(vform, i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::orr(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(vform, i, src1.Uint(vform, i) | src2.Uint(vform, i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::orn(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(vform, i, src1.Uint(vform, i) | ~src2.Uint(vform, i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::eor(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(vform, i, src1.Uint(vform, i) ^ src2.Uint(vform, i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::bic(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(vform, i, src1.Uint(vform, i) & ~src2.Uint(vform, i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::bic(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src, uint64_t imm) {
+  uint64_t result[16];
+  int laneCount = LaneCountFromFormat(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    result[i] = src.Uint(vform, i) & ~imm;
+  }
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::bif(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    uint64_t operand1 = dst.Uint(vform, i);
+    uint64_t operand2 = ~src2.Uint(vform, i);
+    uint64_t operand3 = src1.Uint(vform, i);
+    uint64_t result = operand1 ^ ((operand1 ^ operand3) & operand2);
+    dst.SetUint(vform, i, result);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::bit(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    uint64_t operand1 = dst.Uint(vform, i);
+    uint64_t operand2 = src2.Uint(vform, i);
+    uint64_t operand3 = src1.Uint(vform, i);
+    uint64_t result = operand1 ^ ((operand1 ^ operand3) & operand2);
+    dst.SetUint(vform, i, result);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::bsl(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    uint64_t operand1 = src2.Uint(vform, i);
+    uint64_t operand2 = dst.Uint(vform, i);
+    uint64_t operand3 = src1.Uint(vform, i);
+    uint64_t result = operand1 ^ ((operand1 ^ operand3) & operand2);
+    dst.SetUint(vform, i, result);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::SMinMax(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2, bool max) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    int64_t src1_val = src1.Int(vform, i);
+    int64_t src2_val = src2.Int(vform, i);
+    int64_t dst_val;
+    if (max) {
+      dst_val = (src1_val > src2_val) ? src1_val : src2_val;
+    } else {
+      dst_val = (src1_val < src2_val) ? src1_val : src2_val;
+    }
+    dst.SetInt(vform, i, dst_val);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::smax(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  return SMinMax(vform, dst, src1, src2, true);
+}
+
+LogicVRegister Simulator::smin(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  return SMinMax(vform, dst, src1, src2, false);
+}
+
+LogicVRegister Simulator::SMinMaxP(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2, bool max) {
+  int lanes = LaneCountFromFormat(vform);
+  int64_t result[kMaxLanesPerVector];
+  const LogicVRegister* src = &src1;
+  for (int j = 0; j < 2; j++) {
+    for (int i = 0; i < lanes; i += 2) {
+      int64_t first_val = src->Int(vform, i);
+      int64_t second_val = src->Int(vform, i + 1);
+      int64_t dst_val;
+      if (max) {
+        dst_val = (first_val > second_val) ? first_val : second_val;
+      } else {
+        dst_val = (first_val < second_val) ? first_val : second_val;
+      }
+      DCHECK_LT((i >> 1) + (j * lanes / 2), kMaxLanesPerVector);
+      result[(i >> 1) + (j * lanes / 2)] = dst_val;
+    }
+    src = &src2;
+  }
+  dst.SetIntArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::smaxp(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  return SMinMaxP(vform, dst, src1, src2, true);
+}
+
+LogicVRegister Simulator::sminp(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  return SMinMaxP(vform, dst, src1, src2, false);
+}
+
+LogicVRegister Simulator::addp(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src) {
+  DCHECK_EQ(vform, kFormatD);
+
+  uint64_t dst_val = src.Uint(kFormat2D, 0) + src.Uint(kFormat2D, 1);
+  dst.ClearForWrite(vform);
+  dst.SetUint(vform, 0, dst_val);
+  return dst;
+}
+
+LogicVRegister Simulator::addv(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src) {
+  VectorFormat vform_dst =
+      ScalarFormatFromLaneSize(LaneSizeInBitsFromFormat(vform));
+
+  int64_t dst_val = 0;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst_val += src.Int(vform, i);
+  }
+
+  dst.ClearForWrite(vform_dst);
+  dst.SetInt(vform_dst, 0, dst_val);
+  return dst;
+}
+
+LogicVRegister Simulator::saddlv(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  VectorFormat vform_dst =
+      ScalarFormatFromLaneSize(LaneSizeInBitsFromFormat(vform) * 2);
+
+  int64_t dst_val = 0;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst_val += src.Int(vform, i);
+  }
+
+  dst.ClearForWrite(vform_dst);
+  dst.SetInt(vform_dst, 0, dst_val);
+  return dst;
+}
+
+LogicVRegister Simulator::uaddlv(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  VectorFormat vform_dst =
+      ScalarFormatFromLaneSize(LaneSizeInBitsFromFormat(vform) * 2);
+
+  uint64_t dst_val = 0;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst_val += src.Uint(vform, i);
+  }
+
+  dst.ClearForWrite(vform_dst);
+  dst.SetUint(vform_dst, 0, dst_val);
+  return dst;
+}
+
+LogicVRegister Simulator::SMinMaxV(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src, bool max) {
+  int64_t dst_val = max ? INT64_MIN : INT64_MAX;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    int64_t src_val = src.Int(vform, i);
+    if (max) {
+      dst_val = (src_val > dst_val) ? src_val : dst_val;
+    } else {
+      dst_val = (src_val < dst_val) ? src_val : dst_val;
+    }
+  }
+  dst.ClearForWrite(ScalarFormatFromFormat(vform));
+  dst.SetInt(vform, 0, dst_val);
+  return dst;
+}
+
+LogicVRegister Simulator::smaxv(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  SMinMaxV(vform, dst, src, true);
+  return dst;
+}
+
+LogicVRegister Simulator::sminv(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  SMinMaxV(vform, dst, src, false);
+  return dst;
+}
+
+LogicVRegister Simulator::UMinMax(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2, bool max) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    uint64_t src1_val = src1.Uint(vform, i);
+    uint64_t src2_val = src2.Uint(vform, i);
+    uint64_t dst_val;
+    if (max) {
+      dst_val = (src1_val > src2_val) ? src1_val : src2_val;
+    } else {
+      dst_val = (src1_val < src2_val) ? src1_val : src2_val;
+    }
+    dst.SetUint(vform, i, dst_val);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::umax(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  return UMinMax(vform, dst, src1, src2, true);
+}
+
+LogicVRegister Simulator::umin(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  return UMinMax(vform, dst, src1, src2, false);
+}
+
+LogicVRegister Simulator::UMinMaxP(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2, bool max) {
+  int lanes = LaneCountFromFormat(vform);
+  uint64_t result[kMaxLanesPerVector];
+  const LogicVRegister* src = &src1;
+  for (int j = 0; j < 2; j++) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i += 2) {
+      uint64_t first_val = src->Uint(vform, i);
+      uint64_t second_val = src->Uint(vform, i + 1);
+      uint64_t dst_val;
+      if (max) {
+        dst_val = (first_val > second_val) ? first_val : second_val;
+      } else {
+        dst_val = (first_val < second_val) ? first_val : second_val;
+      }
+      DCHECK_LT((i >> 1) + (j * lanes / 2), kMaxLanesPerVector);
+      result[(i >> 1) + (j * lanes / 2)] = dst_val;
+    }
+    src = &src2;
+  }
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::umaxp(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  return UMinMaxP(vform, dst, src1, src2, true);
+}
+
+LogicVRegister Simulator::uminp(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  return UMinMaxP(vform, dst, src1, src2, false);
+}
+
+LogicVRegister Simulator::UMinMaxV(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src, bool max) {
+  uint64_t dst_val = max ? 0 : UINT64_MAX;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    uint64_t src_val = src.Uint(vform, i);
+    if (max) {
+      dst_val = (src_val > dst_val) ? src_val : dst_val;
+    } else {
+      dst_val = (src_val < dst_val) ? src_val : dst_val;
+    }
+  }
+  dst.ClearForWrite(ScalarFormatFromFormat(vform));
+  dst.SetUint(vform, 0, dst_val);
+  return dst;
+}
+
+LogicVRegister Simulator::umaxv(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  UMinMaxV(vform, dst, src, true);
+  return dst;
+}
+
+LogicVRegister Simulator::uminv(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  UMinMaxV(vform, dst, src, false);
+  return dst;
+}
+
+LogicVRegister Simulator::shl(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp;
+  LogicVRegister shiftreg = dup_immediate(vform, temp, shift);
+  return ushl(vform, dst, src, shiftreg);
+}
+
+LogicVRegister Simulator::sshll(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp1, temp2;
+  LogicVRegister shiftreg = dup_immediate(vform, temp1, shift);
+  LogicVRegister extendedreg = sxtl(vform, temp2, src);
+  return sshl(vform, dst, extendedreg, shiftreg);
+}
+
+LogicVRegister Simulator::sshll2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp1, temp2;
+  LogicVRegister shiftreg = dup_immediate(vform, temp1, shift);
+  LogicVRegister extendedreg = sxtl2(vform, temp2, src);
+  return sshl(vform, dst, extendedreg, shiftreg);
+}
+
+LogicVRegister Simulator::shll(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src) {
+  int shift = LaneSizeInBitsFromFormat(vform) / 2;
+  return sshll(vform, dst, src, shift);
+}
+
+LogicVRegister Simulator::shll2(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  int shift = LaneSizeInBitsFromFormat(vform) / 2;
+  return sshll2(vform, dst, src, shift);
+}
+
+LogicVRegister Simulator::ushll(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp1, temp2;
+  LogicVRegister shiftreg = dup_immediate(vform, temp1, shift);
+  LogicVRegister extendedreg = uxtl(vform, temp2, src);
+  return ushl(vform, dst, extendedreg, shiftreg);
+}
+
+LogicVRegister Simulator::ushll2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp1, temp2;
+  LogicVRegister shiftreg = dup_immediate(vform, temp1, shift);
+  LogicVRegister extendedreg = uxtl2(vform, temp2, src);
+  return ushl(vform, dst, extendedreg, shiftreg);
+}
+
+LogicVRegister Simulator::sli(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src, int shift) {
+  dst.ClearForWrite(vform);
+  int laneCount = LaneCountFromFormat(vform);
+  for (int i = 0; i < laneCount; i++) {
+    uint64_t src_lane = src.Uint(vform, i);
+    uint64_t dst_lane = dst.Uint(vform, i);
+    uint64_t shifted = src_lane << shift;
+    uint64_t mask = MaxUintFromFormat(vform) << shift;
+    dst.SetUint(vform, i, (dst_lane & ~mask) | shifted);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::sqshl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp;
+  LogicVRegister shiftreg = dup_immediate(vform, temp, shift);
+  return sshl(vform, dst, src, shiftreg).SignedSaturate(vform);
+}
+
+LogicVRegister Simulator::uqshl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp;
+  LogicVRegister shiftreg = dup_immediate(vform, temp, shift);
+  return ushl(vform, dst, src, shiftreg).UnsignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sqshlu(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp;
+  LogicVRegister shiftreg = dup_immediate(vform, temp, shift);
+  return sshl(vform, dst, src, shiftreg).UnsignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sri(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src, int shift) {
+  dst.ClearForWrite(vform);
+  int laneCount = LaneCountFromFormat(vform);
+  DCHECK((shift > 0) &&
+         (shift <= static_cast<int>(LaneSizeInBitsFromFormat(vform))));
+  for (int i = 0; i < laneCount; i++) {
+    uint64_t src_lane = src.Uint(vform, i);
+    uint64_t dst_lane = dst.Uint(vform, i);
+    uint64_t shifted;
+    uint64_t mask;
+    if (shift == 64) {
+      shifted = 0;
+      mask = 0;
+    } else {
+      shifted = src_lane >> shift;
+      mask = MaxUintFromFormat(vform) >> shift;
+    }
+    dst.SetUint(vform, i, (dst_lane & ~mask) | shifted);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::ushr(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp;
+  LogicVRegister shiftreg = dup_immediate(vform, temp, -shift);
+  return ushl(vform, dst, src, shiftreg);
+}
+
+LogicVRegister Simulator::sshr(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src, int shift) {
+  DCHECK_GE(shift, 0);
+  SimVRegister temp;
+  LogicVRegister shiftreg = dup_immediate(vform, temp, -shift);
+  return sshl(vform, dst, src, shiftreg);
+}
+
+LogicVRegister Simulator::ssra(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  LogicVRegister shifted_reg = sshr(vform, temp, src, shift);
+  return add(vform, dst, dst, shifted_reg);
+}
+
+LogicVRegister Simulator::usra(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  LogicVRegister shifted_reg = ushr(vform, temp, src, shift);
+  return add(vform, dst, dst, shifted_reg);
+}
+
+LogicVRegister Simulator::srsra(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  LogicVRegister shifted_reg = sshr(vform, temp, src, shift).Round(vform);
+  return add(vform, dst, dst, shifted_reg);
+}
+
+LogicVRegister Simulator::ursra(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  LogicVRegister shifted_reg = ushr(vform, temp, src, shift).Round(vform);
+  return add(vform, dst, dst, shifted_reg);
+}
+
+LogicVRegister Simulator::cls(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src) {
+  uint64_t result[16];
+  int laneSizeInBits = LaneSizeInBitsFromFormat(vform);
+  int laneCount = LaneCountFromFormat(vform);
+  for (int i = 0; i < laneCount; i++) {
+    result[i] = CountLeadingSignBits(src.Int(vform, i), laneSizeInBits);
+  }
+
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::clz(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src) {
+  uint64_t result[16];
+  int laneSizeInBits = LaneSizeInBitsFromFormat(vform);
+  int laneCount = LaneCountFromFormat(vform);
+  for (int i = 0; i < laneCount; i++) {
+    result[i] = CountLeadingZeros(src.Uint(vform, i), laneSizeInBits);
+  }
+
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::cnt(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src) {
+  uint64_t result[16];
+  int laneSizeInBits = LaneSizeInBitsFromFormat(vform);
+  int laneCount = LaneCountFromFormat(vform);
+  for (int i = 0; i < laneCount; i++) {
+    uint64_t value = src.Uint(vform, i);
+    result[i] = 0;
+    for (int j = 0; j < laneSizeInBits; j++) {
+      result[i] += (value & 1);
+      value >>= 1;
+    }
+  }
+
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::sshl(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    int8_t shift_val = src2.Int(vform, i);
+    int64_t lj_src_val = src1.IntLeftJustified(vform, i);
+
+    // Set signed saturation state.
+    if ((shift_val > CountLeadingSignBits(lj_src_val, 64)) &&
+        (lj_src_val != 0)) {
+      dst.SetSignedSat(i, lj_src_val >= 0);
+    }
+
+    // Set unsigned saturation state.
+    if (lj_src_val < 0) {
+      dst.SetUnsignedSat(i, false);
+    } else if ((shift_val > CountLeadingZeros(lj_src_val, 64)) &&
+               (lj_src_val != 0)) {
+      dst.SetUnsignedSat(i, true);
+    }
+
+    int64_t src_val = src1.Int(vform, i);
+    bool src_is_negative = src_val < 0;
+    if (shift_val > 63) {
+      dst.SetInt(vform, i, 0);
+    } else if (shift_val < -63) {
+      dst.SetRounding(i, src_is_negative);
+      dst.SetInt(vform, i, src_is_negative ? -1 : 0);
+    } else {
+      // Use unsigned types for shifts, as behaviour is undefined for signed
+      // lhs.
+      uint64_t usrc_val = static_cast<uint64_t>(src_val);
+
+      if (shift_val < 0) {
+        // Convert to right shift.
+        shift_val = -shift_val;
+
+        // Set rounding state by testing most-significant bit shifted out.
+        // Rounding only needed on right shifts.
+        if (((usrc_val >> (shift_val - 1)) & 1) == 1) {
+          dst.SetRounding(i, true);
+        }
+
+        usrc_val >>= shift_val;
+
+        if (src_is_negative) {
+          // Simulate sign-extension.
+          usrc_val |= (~UINT64_C(0) << (64 - shift_val));
+        }
+      } else {
+        usrc_val <<= shift_val;
+      }
+      dst.SetUint(vform, i, usrc_val);
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::ushl(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    int8_t shift_val = src2.Int(vform, i);
+    uint64_t lj_src_val = src1.UintLeftJustified(vform, i);
+
+    // Set saturation state.
+    if ((shift_val > CountLeadingZeros(lj_src_val, 64)) && (lj_src_val != 0)) {
+      dst.SetUnsignedSat(i, true);
+    }
+
+    uint64_t src_val = src1.Uint(vform, i);
+    if ((shift_val > 63) || (shift_val < -64)) {
+      dst.SetUint(vform, i, 0);
+    } else {
+      if (shift_val < 0) {
+        // Set rounding state. Rounding only needed on right shifts.
+        if (((src_val >> (-shift_val - 1)) & 1) == 1) {
+          dst.SetRounding(i, true);
+        }
+
+        if (shift_val == -64) {
+          src_val = 0;
+        } else {
+          src_val >>= -shift_val;
+        }
+      } else {
+        src_val <<= shift_val;
+      }
+      dst.SetUint(vform, i, src_val);
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::neg(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    // Test for signed saturation.
+    int64_t sa = src.Int(vform, i);
+    if (sa == MinIntFromFormat(vform)) {
+      dst.SetSignedSat(i, true);
+    }
+    dst.SetInt(vform, i, (sa == INT64_MIN) ? sa : -sa);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::suqadd(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    int64_t sa = dst.IntLeftJustified(vform, i);
+    uint64_t ub = src.UintLeftJustified(vform, i);
+    uint64_t ur = sa + ub;
+
+    int64_t sr = bit_cast<int64_t>(ur);
+    if (sr < sa) {  // Test for signed positive saturation.
+      dst.SetInt(vform, i, MaxIntFromFormat(vform));
+    } else {
+      dst.SetUint(vform, i, dst.Int(vform, i) + src.Uint(vform, i));
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::usqadd(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    uint64_t ua = dst.UintLeftJustified(vform, i);
+    int64_t sb = src.IntLeftJustified(vform, i);
+    uint64_t ur = ua + sb;
+
+    if ((sb > 0) && (ur <= ua)) {
+      dst.SetUint(vform, i, MaxUintFromFormat(vform));  // Positive saturation.
+    } else if ((sb < 0) && (ur >= ua)) {
+      dst.SetUint(vform, i, 0);  // Negative saturation.
+    } else {
+      dst.SetUint(vform, i, dst.Uint(vform, i) + src.Int(vform, i));
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::abs(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    // Test for signed saturation.
+    int64_t sa = src.Int(vform, i);
+    if (sa == MinIntFromFormat(vform)) {
+      dst.SetSignedSat(i, true);
+    }
+    if (sa < 0) {
+      dst.SetInt(vform, i, (sa == INT64_MIN) ? sa : -sa);
+    } else {
+      dst.SetInt(vform, i, sa);
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::ExtractNarrow(VectorFormat dstform,
+                                        LogicVRegister dst, bool dstIsSigned,
+                                        const LogicVRegister& src,
+                                        bool srcIsSigned) {
+  bool upperhalf = false;
+  VectorFormat srcform = kFormatUndefined;
+  int64_t ssrc[8];
+  uint64_t usrc[8];
+
+  switch (dstform) {
+    case kFormat8B:
+      upperhalf = false;
+      srcform = kFormat8H;
+      break;
+    case kFormat16B:
+      upperhalf = true;
+      srcform = kFormat8H;
+      break;
+    case kFormat4H:
+      upperhalf = false;
+      srcform = kFormat4S;
+      break;
+    case kFormat8H:
+      upperhalf = true;
+      srcform = kFormat4S;
+      break;
+    case kFormat2S:
+      upperhalf = false;
+      srcform = kFormat2D;
+      break;
+    case kFormat4S:
+      upperhalf = true;
+      srcform = kFormat2D;
+      break;
+    case kFormatB:
+      upperhalf = false;
+      srcform = kFormatH;
+      break;
+    case kFormatH:
+      upperhalf = false;
+      srcform = kFormatS;
+      break;
+    case kFormatS:
+      upperhalf = false;
+      srcform = kFormatD;
+      break;
+    default:
+      UNIMPLEMENTED();
+  }
+
+  for (int i = 0; i < LaneCountFromFormat(srcform); i++) {
+    ssrc[i] = src.Int(srcform, i);
+    usrc[i] = src.Uint(srcform, i);
+  }
+
+  int offset;
+  if (upperhalf) {
+    offset = LaneCountFromFormat(dstform) / 2;
+  } else {
+    offset = 0;
+    dst.ClearForWrite(dstform);
+  }
+
+  for (int i = 0; i < LaneCountFromFormat(srcform); i++) {
+    // Test for signed saturation
+    if (ssrc[i] > MaxIntFromFormat(dstform)) {
+      dst.SetSignedSat(offset + i, true);
+    } else if (ssrc[i] < MinIntFromFormat(dstform)) {
+      dst.SetSignedSat(offset + i, false);
+    }
+
+    // Test for unsigned saturation
+    if (srcIsSigned) {
+      if (ssrc[i] > static_cast<int64_t>(MaxUintFromFormat(dstform))) {
+        dst.SetUnsignedSat(offset + i, true);
+      } else if (ssrc[i] < 0) {
+        dst.SetUnsignedSat(offset + i, false);
+      }
+    } else {
+      if (usrc[i] > MaxUintFromFormat(dstform)) {
+        dst.SetUnsignedSat(offset + i, true);
+      }
+    }
+
+    int64_t result;
+    if (srcIsSigned) {
+      result = ssrc[i] & MaxUintFromFormat(dstform);
+    } else {
+      result = usrc[i] & MaxUintFromFormat(dstform);
+    }
+
+    if (dstIsSigned) {
+      dst.SetInt(dstform, offset + i, result);
+    } else {
+      dst.SetUint(dstform, offset + i, result);
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::xtn(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src) {
+  return ExtractNarrow(vform, dst, true, src, true);
+}
+
+LogicVRegister Simulator::sqxtn(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  return ExtractNarrow(vform, dst, true, src, true).SignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sqxtun(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  return ExtractNarrow(vform, dst, false, src, true).UnsignedSaturate(vform);
+}
+
+LogicVRegister Simulator::uqxtn(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  return ExtractNarrow(vform, dst, false, src, false).UnsignedSaturate(vform);
+}
+
+LogicVRegister Simulator::AbsDiff(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2, bool issigned) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    if (issigned) {
+      int64_t sr = src1.Int(vform, i) - src2.Int(vform, i);
+      sr = sr > 0 ? sr : -sr;
+      dst.SetInt(vform, i, sr);
+    } else {
+      int64_t sr = src1.Uint(vform, i) - src2.Uint(vform, i);
+      sr = sr > 0 ? sr : -sr;
+      dst.SetUint(vform, i, sr);
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::saba(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  SimVRegister temp;
+  dst.ClearForWrite(vform);
+  AbsDiff(vform, temp, src1, src2, true);
+  add(vform, dst, dst, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::uaba(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  SimVRegister temp;
+  dst.ClearForWrite(vform);
+  AbsDiff(vform, temp, src1, src2, false);
+  add(vform, dst, dst, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::not_(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(vform, i, ~src.Uint(vform, i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::rbit(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src) {
+  uint64_t result[16];
+  int laneCount = LaneCountFromFormat(vform);
+  int laneSizeInBits = LaneSizeInBitsFromFormat(vform);
+  uint64_t reversed_value;
+  uint64_t value;
+  for (int i = 0; i < laneCount; i++) {
+    value = src.Uint(vform, i);
+    reversed_value = 0;
+    for (int j = 0; j < laneSizeInBits; j++) {
+      reversed_value = (reversed_value << 1) | (value & 1);
+      value >>= 1;
+    }
+    result[i] = reversed_value;
+  }
+
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::rev(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src, int revSize) {
+  uint64_t result[16];
+  int laneCount = LaneCountFromFormat(vform);
+  int laneSize = LaneSizeInBytesFromFormat(vform);
+  int lanesPerLoop = revSize / laneSize;
+  for (int i = 0; i < laneCount; i += lanesPerLoop) {
+    for (int j = 0; j < lanesPerLoop; j++) {
+      result[i + lanesPerLoop - 1 - j] = src.Uint(vform, i + j);
+    }
+  }
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::rev16(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  return rev(vform, dst, src, 2);
+}
+
+LogicVRegister Simulator::rev32(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  return rev(vform, dst, src, 4);
+}
+
+LogicVRegister Simulator::rev64(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  return rev(vform, dst, src, 8);
+}
+
+LogicVRegister Simulator::addlp(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, bool is_signed,
+                                bool do_accumulate) {
+  VectorFormat vformsrc = VectorFormatHalfWidthDoubleLanes(vform);
+  DCHECK_LE(LaneSizeInBitsFromFormat(vformsrc), 32U);
+  DCHECK_LE(LaneCountFromFormat(vform), 8);
+
+  uint64_t result[8];
+  int lane_count = LaneCountFromFormat(vform);
+  for (int i = 0; i < lane_count; i++) {
+    if (is_signed) {
+      result[i] = static_cast<uint64_t>(src.Int(vformsrc, 2 * i) +
+                                        src.Int(vformsrc, 2 * i + 1));
+    } else {
+      result[i] = src.Uint(vformsrc, 2 * i) + src.Uint(vformsrc, 2 * i + 1);
+    }
+  }
+
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < lane_count; ++i) {
+    if (do_accumulate) {
+      result[i] += dst.Uint(vform, i);
+    }
+    dst.SetUint(vform, i, result[i]);
+  }
+
+  return dst;
+}
+
+LogicVRegister Simulator::saddlp(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  return addlp(vform, dst, src, true, false);
+}
+
+LogicVRegister Simulator::uaddlp(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  return addlp(vform, dst, src, false, false);
+}
+
+LogicVRegister Simulator::sadalp(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  return addlp(vform, dst, src, true, true);
+}
+
+LogicVRegister Simulator::uadalp(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  return addlp(vform, dst, src, false, true);
+}
+
+LogicVRegister Simulator::ext(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src1,
+                              const LogicVRegister& src2, int index) {
+  uint8_t result[16];
+  int laneCount = LaneCountFromFormat(vform);
+  for (int i = 0; i < laneCount - index; ++i) {
+    result[i] = src1.Uint(vform, i + index);
+  }
+  for (int i = 0; i < index; ++i) {
+    result[laneCount - index + i] = src2.Uint(vform, i);
+  }
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    dst.SetUint(vform, i, result[i]);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::dup_element(VectorFormat vform, LogicVRegister dst,
+                                      const LogicVRegister& src,
+                                      int src_index) {
+  int laneCount = LaneCountFromFormat(vform);
+  uint64_t value = src.Uint(vform, src_index);
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    dst.SetUint(vform, i, value);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::dup_immediate(VectorFormat vform, LogicVRegister dst,
+                                        uint64_t imm) {
+  int laneCount = LaneCountFromFormat(vform);
+  uint64_t value = imm & MaxUintFromFormat(vform);
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    dst.SetUint(vform, i, value);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::ins_element(VectorFormat vform, LogicVRegister dst,
+                                      int dst_index, const LogicVRegister& src,
+                                      int src_index) {
+  dst.SetUint(vform, dst_index, src.Uint(vform, src_index));
+  return dst;
+}
+
+LogicVRegister Simulator::ins_immediate(VectorFormat vform, LogicVRegister dst,
+                                        int dst_index, uint64_t imm) {
+  uint64_t value = imm & MaxUintFromFormat(vform);
+  dst.SetUint(vform, dst_index, value);
+  return dst;
+}
+
+LogicVRegister Simulator::movi(VectorFormat vform, LogicVRegister dst,
+                               uint64_t imm) {
+  int laneCount = LaneCountFromFormat(vform);
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    dst.SetUint(vform, i, imm);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::mvni(VectorFormat vform, LogicVRegister dst,
+                               uint64_t imm) {
+  int laneCount = LaneCountFromFormat(vform);
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    dst.SetUint(vform, i, ~imm);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::orr(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& src, uint64_t imm) {
+  uint64_t result[16];
+  int laneCount = LaneCountFromFormat(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    result[i] = src.Uint(vform, i) | imm;
+  }
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::uxtl(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src) {
+  VectorFormat vform_half = VectorFormatHalfWidth(vform);
+
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetUint(vform, i, src.Uint(vform_half, i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::sxtl(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src) {
+  VectorFormat vform_half = VectorFormatHalfWidth(vform);
+
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetInt(vform, i, src.Int(vform_half, i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::uxtl2(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  VectorFormat vform_half = VectorFormatHalfWidth(vform);
+  int lane_count = LaneCountFromFormat(vform);
+
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < lane_count; i++) {
+    dst.SetUint(vform, i, src.Uint(vform_half, lane_count + i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::sxtl2(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  VectorFormat vform_half = VectorFormatHalfWidth(vform);
+  int lane_count = LaneCountFromFormat(vform);
+
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < lane_count; i++) {
+    dst.SetInt(vform, i, src.Int(vform_half, lane_count + i));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::shrn(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vform_src = VectorFormatDoubleWidth(vform);
+  VectorFormat vform_dst = vform;
+  LogicVRegister shifted_src = ushr(vform_src, temp, src, shift);
+  return ExtractNarrow(vform_dst, dst, false, shifted_src, false);
+}
+
+LogicVRegister Simulator::shrn2(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(VectorFormatHalfLanes(vform));
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = ushr(vformsrc, temp, src, shift);
+  return ExtractNarrow(vformdst, dst, false, shifted_src, false);
+}
+
+LogicVRegister Simulator::rshrn(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(vform);
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = ushr(vformsrc, temp, src, shift).Round(vformsrc);
+  return ExtractNarrow(vformdst, dst, false, shifted_src, false);
+}
+
+LogicVRegister Simulator::rshrn2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(VectorFormatHalfLanes(vform));
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = ushr(vformsrc, temp, src, shift).Round(vformsrc);
+  return ExtractNarrow(vformdst, dst, false, shifted_src, false);
+}
+
+LogicVRegister Simulator::Table(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& ind,
+                                bool zero_out_of_bounds,
+                                const LogicVRegister* tab1,
+                                const LogicVRegister* tab2,
+                                const LogicVRegister* tab3,
+                                const LogicVRegister* tab4) {
+  DCHECK_NOT_NULL(tab1);
+  const LogicVRegister* tab[4] = {tab1, tab2, tab3, tab4};
+  uint64_t result[kMaxLanesPerVector];
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    result[i] = zero_out_of_bounds ? 0 : dst.Uint(kFormat16B, i);
+  }
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    uint64_t j = ind.Uint(vform, i);
+    int tab_idx = static_cast<int>(j >> 4);
+    int j_idx = static_cast<int>(j & 15);
+    if ((tab_idx < 4) && (tab[tab_idx] != NULL)) {
+      result[i] = tab[tab_idx]->Uint(kFormat16B, j_idx);
+    }
+  }
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::tbl(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& tab,
+                              const LogicVRegister& ind) {
+  return Table(vform, dst, ind, true, &tab);
+}
+
+LogicVRegister Simulator::tbl(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& tab,
+                              const LogicVRegister& tab2,
+                              const LogicVRegister& ind) {
+  return Table(vform, dst, ind, true, &tab, &tab2);
+}
+
+LogicVRegister Simulator::tbl(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& tab,
+                              const LogicVRegister& tab2,
+                              const LogicVRegister& tab3,
+                              const LogicVRegister& ind) {
+  return Table(vform, dst, ind, true, &tab, &tab2, &tab3);
+}
+
+LogicVRegister Simulator::tbl(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& tab,
+                              const LogicVRegister& tab2,
+                              const LogicVRegister& tab3,
+                              const LogicVRegister& tab4,
+                              const LogicVRegister& ind) {
+  return Table(vform, dst, ind, true, &tab, &tab2, &tab3, &tab4);
+}
+
+LogicVRegister Simulator::tbx(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& tab,
+                              const LogicVRegister& ind) {
+  return Table(vform, dst, ind, false, &tab);
+}
+
+LogicVRegister Simulator::tbx(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& tab,
+                              const LogicVRegister& tab2,
+                              const LogicVRegister& ind) {
+  return Table(vform, dst, ind, false, &tab, &tab2);
+}
+
+LogicVRegister Simulator::tbx(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& tab,
+                              const LogicVRegister& tab2,
+                              const LogicVRegister& tab3,
+                              const LogicVRegister& ind) {
+  return Table(vform, dst, ind, false, &tab, &tab2, &tab3);
+}
+
+LogicVRegister Simulator::tbx(VectorFormat vform, LogicVRegister dst,
+                              const LogicVRegister& tab,
+                              const LogicVRegister& tab2,
+                              const LogicVRegister& tab3,
+                              const LogicVRegister& tab4,
+                              const LogicVRegister& ind) {
+  return Table(vform, dst, ind, false, &tab, &tab2, &tab3, &tab4);
+}
+
+LogicVRegister Simulator::uqshrn(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src, int shift) {
+  return shrn(vform, dst, src, shift).UnsignedSaturate(vform);
+}
+
+LogicVRegister Simulator::uqshrn2(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src, int shift) {
+  return shrn2(vform, dst, src, shift).UnsignedSaturate(vform);
+}
+
+LogicVRegister Simulator::uqrshrn(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src, int shift) {
+  return rshrn(vform, dst, src, shift).UnsignedSaturate(vform);
+}
+
+LogicVRegister Simulator::uqrshrn2(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src, int shift) {
+  return rshrn2(vform, dst, src, shift).UnsignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sqshrn(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(vform);
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = sshr(vformsrc, temp, src, shift);
+  return sqxtn(vformdst, dst, shifted_src);
+}
+
+LogicVRegister Simulator::sqshrn2(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(VectorFormatHalfLanes(vform));
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = sshr(vformsrc, temp, src, shift);
+  return sqxtn(vformdst, dst, shifted_src);
+}
+
+LogicVRegister Simulator::sqrshrn(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(vform);
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = sshr(vformsrc, temp, src, shift).Round(vformsrc);
+  return sqxtn(vformdst, dst, shifted_src);
+}
+
+LogicVRegister Simulator::sqrshrn2(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(VectorFormatHalfLanes(vform));
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = sshr(vformsrc, temp, src, shift).Round(vformsrc);
+  return sqxtn(vformdst, dst, shifted_src);
+}
+
+LogicVRegister Simulator::sqshrun(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(vform);
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = sshr(vformsrc, temp, src, shift);
+  return sqxtun(vformdst, dst, shifted_src);
+}
+
+LogicVRegister Simulator::sqshrun2(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(VectorFormatHalfLanes(vform));
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = sshr(vformsrc, temp, src, shift);
+  return sqxtun(vformdst, dst, shifted_src);
+}
+
+LogicVRegister Simulator::sqrshrun(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(vform);
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = sshr(vformsrc, temp, src, shift).Round(vformsrc);
+  return sqxtun(vformdst, dst, shifted_src);
+}
+
+LogicVRegister Simulator::sqrshrun2(VectorFormat vform, LogicVRegister dst,
+                                    const LogicVRegister& src, int shift) {
+  SimVRegister temp;
+  VectorFormat vformsrc = VectorFormatDoubleWidth(VectorFormatHalfLanes(vform));
+  VectorFormat vformdst = vform;
+  LogicVRegister shifted_src = sshr(vformsrc, temp, src, shift).Round(vformsrc);
+  return sqxtun(vformdst, dst, shifted_src);
+}
+
+LogicVRegister Simulator::uaddl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl(vform, temp1, src1);
+  uxtl(vform, temp2, src2);
+  add(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::uaddl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl2(vform, temp1, src1);
+  uxtl2(vform, temp2, src2);
+  add(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::uaddw(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp;
+  uxtl(vform, temp, src2);
+  add(vform, dst, src1, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::uaddw2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp;
+  uxtl2(vform, temp, src2);
+  add(vform, dst, src1, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::saddl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl(vform, temp1, src1);
+  sxtl(vform, temp2, src2);
+  add(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::saddl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl2(vform, temp1, src1);
+  sxtl2(vform, temp2, src2);
+  add(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::saddw(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp;
+  sxtl(vform, temp, src2);
+  add(vform, dst, src1, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::saddw2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp;
+  sxtl2(vform, temp, src2);
+  add(vform, dst, src1, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::usubl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl(vform, temp1, src1);
+  uxtl(vform, temp2, src2);
+  sub(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::usubl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl2(vform, temp1, src1);
+  uxtl2(vform, temp2, src2);
+  sub(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::usubw(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp;
+  uxtl(vform, temp, src2);
+  sub(vform, dst, src1, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::usubw2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp;
+  uxtl2(vform, temp, src2);
+  sub(vform, dst, src1, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::ssubl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl(vform, temp1, src1);
+  sxtl(vform, temp2, src2);
+  sub(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::ssubl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl2(vform, temp1, src1);
+  sxtl2(vform, temp2, src2);
+  sub(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::ssubw(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp;
+  sxtl(vform, temp, src2);
+  sub(vform, dst, src1, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::ssubw2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp;
+  sxtl2(vform, temp, src2);
+  sub(vform, dst, src1, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::uabal(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl(vform, temp1, src1);
+  uxtl(vform, temp2, src2);
+  uaba(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::uabal2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl2(vform, temp1, src1);
+  uxtl2(vform, temp2, src2);
+  uaba(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::sabal(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl(vform, temp1, src1);
+  sxtl(vform, temp2, src2);
+  saba(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::sabal2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl2(vform, temp1, src1);
+  sxtl2(vform, temp2, src2);
+  saba(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::uabdl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl(vform, temp1, src1);
+  uxtl(vform, temp2, src2);
+  AbsDiff(vform, dst, temp1, temp2, false);
+  return dst;
+}
+
+LogicVRegister Simulator::uabdl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl2(vform, temp1, src1);
+  uxtl2(vform, temp2, src2);
+  AbsDiff(vform, dst, temp1, temp2, false);
+  return dst;
+}
+
+LogicVRegister Simulator::sabdl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl(vform, temp1, src1);
+  sxtl(vform, temp2, src2);
+  AbsDiff(vform, dst, temp1, temp2, true);
+  return dst;
+}
+
+LogicVRegister Simulator::sabdl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl2(vform, temp1, src1);
+  sxtl2(vform, temp2, src2);
+  AbsDiff(vform, dst, temp1, temp2, true);
+  return dst;
+}
+
+LogicVRegister Simulator::umull(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl(vform, temp1, src1);
+  uxtl(vform, temp2, src2);
+  mul(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::umull2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl2(vform, temp1, src1);
+  uxtl2(vform, temp2, src2);
+  mul(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::smull(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl(vform, temp1, src1);
+  sxtl(vform, temp2, src2);
+  mul(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::smull2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl2(vform, temp1, src1);
+  sxtl2(vform, temp2, src2);
+  mul(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::umlsl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl(vform, temp1, src1);
+  uxtl(vform, temp2, src2);
+  mls(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::umlsl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl2(vform, temp1, src1);
+  uxtl2(vform, temp2, src2);
+  mls(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::smlsl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl(vform, temp1, src1);
+  sxtl(vform, temp2, src2);
+  mls(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::smlsl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl2(vform, temp1, src1);
+  sxtl2(vform, temp2, src2);
+  mls(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::umlal(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl(vform, temp1, src1);
+  uxtl(vform, temp2, src2);
+  mla(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::umlal2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  uxtl2(vform, temp1, src1);
+  uxtl2(vform, temp2, src2);
+  mla(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::smlal(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl(vform, temp1, src1);
+  sxtl(vform, temp2, src2);
+  mla(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::smlal2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp1, temp2;
+  sxtl2(vform, temp1, src1);
+  sxtl2(vform, temp2, src2);
+  mla(vform, dst, temp1, temp2);
+  return dst;
+}
+
+LogicVRegister Simulator::sqdmlal(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2) {
+  SimVRegister temp;
+  LogicVRegister product = sqdmull(vform, temp, src1, src2);
+  return add(vform, dst, dst, product).SignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sqdmlal2(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2) {
+  SimVRegister temp;
+  LogicVRegister product = sqdmull2(vform, temp, src1, src2);
+  return add(vform, dst, dst, product).SignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sqdmlsl(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2) {
+  SimVRegister temp;
+  LogicVRegister product = sqdmull(vform, temp, src1, src2);
+  return sub(vform, dst, dst, product).SignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sqdmlsl2(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2) {
+  SimVRegister temp;
+  LogicVRegister product = sqdmull2(vform, temp, src1, src2);
+  return sub(vform, dst, dst, product).SignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sqdmull(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2) {
+  SimVRegister temp;
+  LogicVRegister product = smull(vform, temp, src1, src2);
+  return add(vform, dst, product, product).SignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sqdmull2(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2) {
+  SimVRegister temp;
+  LogicVRegister product = smull2(vform, temp, src1, src2);
+  return add(vform, dst, product, product).SignedSaturate(vform);
+}
+
+LogicVRegister Simulator::sqrdmulh(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src1,
+                                   const LogicVRegister& src2, bool round) {
+  // 2 * INT_32_MIN * INT_32_MIN causes int64_t to overflow.
+  // To avoid this, we use (src1 * src2 + 1 << (esize - 2)) >> (esize - 1)
+  // which is same as (2 * src1 * src2 + 1 << (esize - 1)) >> esize.
+
+  int esize = LaneSizeInBitsFromFormat(vform);
+  int round_const = round ? (1 << (esize - 2)) : 0;
+  int64_t product;
+
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    product = src1.Int(vform, i) * src2.Int(vform, i);
+    product += round_const;
+    product = product >> (esize - 1);
+
+    if (product > MaxIntFromFormat(vform)) {
+      product = MaxIntFromFormat(vform);
+    } else if (product < MinIntFromFormat(vform)) {
+      product = MinIntFromFormat(vform);
+    }
+    dst.SetInt(vform, i, product);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::sqdmulh(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2) {
+  return sqrdmulh(vform, dst, src1, src2, false);
+}
+
+LogicVRegister Simulator::addhn(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp;
+  add(VectorFormatDoubleWidth(vform), temp, src1, src2);
+  shrn(vform, dst, temp, LaneSizeInBitsFromFormat(vform));
+  return dst;
+}
+
+LogicVRegister Simulator::addhn2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp;
+  add(VectorFormatDoubleWidth(VectorFormatHalfLanes(vform)), temp, src1, src2);
+  shrn2(vform, dst, temp, LaneSizeInBitsFromFormat(vform));
+  return dst;
+}
+
+LogicVRegister Simulator::raddhn(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp;
+  add(VectorFormatDoubleWidth(vform), temp, src1, src2);
+  rshrn(vform, dst, temp, LaneSizeInBitsFromFormat(vform));
+  return dst;
+}
+
+LogicVRegister Simulator::raddhn2(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2) {
+  SimVRegister temp;
+  add(VectorFormatDoubleWidth(VectorFormatHalfLanes(vform)), temp, src1, src2);
+  rshrn2(vform, dst, temp, LaneSizeInBitsFromFormat(vform));
+  return dst;
+}
+
+LogicVRegister Simulator::subhn(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp;
+  sub(VectorFormatDoubleWidth(vform), temp, src1, src2);
+  shrn(vform, dst, temp, LaneSizeInBitsFromFormat(vform));
+  return dst;
+}
+
+LogicVRegister Simulator::subhn2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp;
+  sub(VectorFormatDoubleWidth(VectorFormatHalfLanes(vform)), temp, src1, src2);
+  shrn2(vform, dst, temp, LaneSizeInBitsFromFormat(vform));
+  return dst;
+}
+
+LogicVRegister Simulator::rsubhn(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  SimVRegister temp;
+  sub(VectorFormatDoubleWidth(vform), temp, src1, src2);
+  rshrn(vform, dst, temp, LaneSizeInBitsFromFormat(vform));
+  return dst;
+}
+
+LogicVRegister Simulator::rsubhn2(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2) {
+  SimVRegister temp;
+  sub(VectorFormatDoubleWidth(VectorFormatHalfLanes(vform)), temp, src1, src2);
+  rshrn2(vform, dst, temp, LaneSizeInBitsFromFormat(vform));
+  return dst;
+}
+
+LogicVRegister Simulator::trn1(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  uint64_t result[16];
+  int laneCount = LaneCountFromFormat(vform);
+  int pairs = laneCount / 2;
+  for (int i = 0; i < pairs; ++i) {
+    result[2 * i] = src1.Uint(vform, 2 * i);
+    result[(2 * i) + 1] = src2.Uint(vform, 2 * i);
+  }
+
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::trn2(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  uint64_t result[16];
+  int laneCount = LaneCountFromFormat(vform);
+  int pairs = laneCount / 2;
+  for (int i = 0; i < pairs; ++i) {
+    result[2 * i] = src1.Uint(vform, (2 * i) + 1);
+    result[(2 * i) + 1] = src2.Uint(vform, (2 * i) + 1);
+  }
+
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::zip1(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  uint64_t result[16];
+  int laneCount = LaneCountFromFormat(vform);
+  int pairs = laneCount / 2;
+  for (int i = 0; i < pairs; ++i) {
+    result[2 * i] = src1.Uint(vform, i);
+    result[(2 * i) + 1] = src2.Uint(vform, i);
+  }
+
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::zip2(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  uint64_t result[16];
+  int laneCount = LaneCountFromFormat(vform);
+  int pairs = laneCount / 2;
+  for (int i = 0; i < pairs; ++i) {
+    result[2 * i] = src1.Uint(vform, pairs + i);
+    result[(2 * i) + 1] = src2.Uint(vform, pairs + i);
+  }
+
+  dst.SetUintArray(vform, result);
+  return dst;
+}
+
+LogicVRegister Simulator::uzp1(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  uint64_t result[32];
+  int laneCount = LaneCountFromFormat(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    result[i] = src1.Uint(vform, i);
+    result[laneCount + i] = src2.Uint(vform, i);
+  }
+
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    dst.SetUint(vform, i, result[2 * i]);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::uzp2(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  uint64_t result[32];
+  int laneCount = LaneCountFromFormat(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    result[i] = src1.Uint(vform, i);
+    result[laneCount + i] = src2.Uint(vform, i);
+  }
+
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < laneCount; ++i) {
+    dst.SetUint(vform, i, result[(2 * i) + 1]);
+  }
+  return dst;
+}
+
+template <typename T>
+T Simulator::FPAdd(T op1, T op2) {
+  T result = FPProcessNaNs(op1, op2);
+  if (std::isnan(result)) return result;
+
+  if (std::isinf(op1) && std::isinf(op2) && (op1 != op2)) {
+    // inf + -inf returns the default NaN.
+    FPProcessException();
+    return FPDefaultNaN<T>();
+  } else {
+    // Other cases should be handled by standard arithmetic.
+    return op1 + op2;
+  }
+}
+
+template <typename T>
+T Simulator::FPSub(T op1, T op2) {
+  // NaNs should be handled elsewhere.
+  DCHECK(!std::isnan(op1) && !std::isnan(op2));
+
+  if (std::isinf(op1) && std::isinf(op2) && (op1 == op2)) {
+    // inf - inf returns the default NaN.
+    FPProcessException();
+    return FPDefaultNaN<T>();
+  } else {
+    // Other cases should be handled by standard arithmetic.
+    return op1 - op2;
+  }
+}
+
+template <typename T>
+T Simulator::FPMul(T op1, T op2) {
+  // NaNs should be handled elsewhere.
+  DCHECK(!std::isnan(op1) && !std::isnan(op2));
+
+  if ((std::isinf(op1) && (op2 == 0.0)) || (std::isinf(op2) && (op1 == 0.0))) {
+    // inf * 0.0 returns the default NaN.
+    FPProcessException();
+    return FPDefaultNaN<T>();
+  } else {
+    // Other cases should be handled by standard arithmetic.
+    return op1 * op2;
+  }
+}
+
+template <typename T>
+T Simulator::FPMulx(T op1, T op2) {
+  if ((std::isinf(op1) && (op2 == 0.0)) || (std::isinf(op2) && (op1 == 0.0))) {
+    // inf * 0.0 returns +/-2.0.
+    T two = 2.0;
+    return copysign(1.0, op1) * copysign(1.0, op2) * two;
+  }
+  return FPMul(op1, op2);
+}
+
+template <typename T>
+T Simulator::FPMulAdd(T a, T op1, T op2) {
+  T result = FPProcessNaNs3(a, op1, op2);
+
+  T sign_a = copysign(1.0, a);
+  T sign_prod = copysign(1.0, op1) * copysign(1.0, op2);
+  bool isinf_prod = std::isinf(op1) || std::isinf(op2);
+  bool operation_generates_nan =
+      (std::isinf(op1) && (op2 == 0.0)) ||                     // inf * 0.0
+      (std::isinf(op2) && (op1 == 0.0)) ||                     // 0.0 * inf
+      (std::isinf(a) && isinf_prod && (sign_a != sign_prod));  // inf - inf
+
+  if (std::isnan(result)) {
+    // Generated NaNs override quiet NaNs propagated from a.
+    if (operation_generates_nan && IsQuietNaN(a)) {
+      FPProcessException();
+      return FPDefaultNaN<T>();
+    } else {
+      return result;
+    }
+  }
+
+  // If the operation would produce a NaN, return the default NaN.
+  if (operation_generates_nan) {
+    FPProcessException();
+    return FPDefaultNaN<T>();
+  }
+
+  // Work around broken fma implementations for exact zero results: The sign of
+  // exact 0.0 results is positive unless both a and op1 * op2 are negative.
+  if (((op1 == 0.0) || (op2 == 0.0)) && (a == 0.0)) {
+    return ((sign_a < 0) && (sign_prod < 0)) ? -0.0 : 0.0;
+  }
+
+  result = FusedMultiplyAdd(op1, op2, a);
+  DCHECK(!std::isnan(result));
+
+  // Work around broken fma implementations for rounded zero results: If a is
+  // 0.0, the sign of the result is the sign of op1 * op2 before rounding.
+  if ((a == 0.0) && (result == 0.0)) {
+    return copysign(0.0, sign_prod);
+  }
+
+  return result;
+}
+
+template <typename T>
+T Simulator::FPDiv(T op1, T op2) {
+  // NaNs should be handled elsewhere.
+  DCHECK(!std::isnan(op1) && !std::isnan(op2));
+
+  if ((std::isinf(op1) && std::isinf(op2)) || ((op1 == 0.0) && (op2 == 0.0))) {
+    // inf / inf and 0.0 / 0.0 return the default NaN.
+    FPProcessException();
+    return FPDefaultNaN<T>();
+  } else {
+    if (op2 == 0.0) {
+      FPProcessException();
+      if (!std::isnan(op1)) {
+        double op1_sign = copysign(1.0, op1);
+        double op2_sign = copysign(1.0, op2);
+        return static_cast<T>(op1_sign * op2_sign * kFP64PositiveInfinity);
+      }
+    }
+
+    // Other cases should be handled by standard arithmetic.
+    return op1 / op2;
+  }
+}
+
+template <typename T>
+T Simulator::FPSqrt(T op) {
+  if (std::isnan(op)) {
+    return FPProcessNaN(op);
+  } else if (op < 0.0) {
+    FPProcessException();
+    return FPDefaultNaN<T>();
+  } else {
+    return sqrt(op);
+  }
+}
+
+template <typename T>
+T Simulator::FPMax(T a, T b) {
+  T result = FPProcessNaNs(a, b);
+  if (std::isnan(result)) return result;
+
+  if ((a == 0.0) && (b == 0.0) && (copysign(1.0, a) != copysign(1.0, b))) {
+    // a and b are zero, and the sign differs: return +0.0.
+    return 0.0;
+  } else {
+    return (a > b) ? a : b;
+  }
+}
+
+template <typename T>
+T Simulator::FPMaxNM(T a, T b) {
+  if (IsQuietNaN(a) && !IsQuietNaN(b)) {
+    a = kFP64NegativeInfinity;
+  } else if (!IsQuietNaN(a) && IsQuietNaN(b)) {
+    b = kFP64NegativeInfinity;
+  }
+
+  T result = FPProcessNaNs(a, b);
+  return std::isnan(result) ? result : FPMax(a, b);
+}
+
+template <typename T>
+T Simulator::FPMin(T a, T b) {
+  T result = FPProcessNaNs(a, b);
+  if (std::isnan(result)) return result;
+
+  if ((a == 0.0) && (b == 0.0) && (copysign(1.0, a) != copysign(1.0, b))) {
+    // a and b are zero, and the sign differs: return -0.0.
+    return -0.0;
+  } else {
+    return (a < b) ? a : b;
+  }
+}
+
+template <typename T>
+T Simulator::FPMinNM(T a, T b) {
+  if (IsQuietNaN(a) && !IsQuietNaN(b)) {
+    a = kFP64PositiveInfinity;
+  } else if (!IsQuietNaN(a) && IsQuietNaN(b)) {
+    b = kFP64PositiveInfinity;
+  }
+
+  T result = FPProcessNaNs(a, b);
+  return std::isnan(result) ? result : FPMin(a, b);
+}
+
+template <typename T>
+T Simulator::FPRecipStepFused(T op1, T op2) {
+  const T two = 2.0;
+  if ((std::isinf(op1) && (op2 == 0.0)) ||
+      ((op1 == 0.0) && (std::isinf(op2)))) {
+    return two;
+  } else if (std::isinf(op1) || std::isinf(op2)) {
+    // Return +inf if signs match, otherwise -inf.
+    return ((op1 >= 0.0) == (op2 >= 0.0)) ? kFP64PositiveInfinity
+                                          : kFP64NegativeInfinity;
+  } else {
+    return FusedMultiplyAdd(op1, op2, two);
+  }
+}
+
+template <typename T>
+T Simulator::FPRSqrtStepFused(T op1, T op2) {
+  const T one_point_five = 1.5;
+  const T two = 2.0;
+
+  if ((std::isinf(op1) && (op2 == 0.0)) ||
+      ((op1 == 0.0) && (std::isinf(op2)))) {
+    return one_point_five;
+  } else if (std::isinf(op1) || std::isinf(op2)) {
+    // Return +inf if signs match, otherwise -inf.
+    return ((op1 >= 0.0) == (op2 >= 0.0)) ? kFP64PositiveInfinity
+                                          : kFP64NegativeInfinity;
+  } else {
+    // The multiply-add-halve operation must be fully fused, so avoid interim
+    // rounding by checking which operand can be losslessly divided by two
+    // before doing the multiply-add.
+    if (std::isnormal(op1 / two)) {
+      return FusedMultiplyAdd(op1 / two, op2, one_point_five);
+    } else if (std::isnormal(op2 / two)) {
+      return FusedMultiplyAdd(op1, op2 / two, one_point_five);
+    } else {
+      // Neither operand is normal after halving: the result is dominated by
+      // the addition term, so just return that.
+      return one_point_five;
+    }
+  }
+}
+
+double Simulator::FPRoundInt(double value, FPRounding round_mode) {
+  if ((value == 0.0) || (value == kFP64PositiveInfinity) ||
+      (value == kFP64NegativeInfinity)) {
+    return value;
+  } else if (std::isnan(value)) {
+    return FPProcessNaN(value);
+  }
+
+  double int_result = std::floor(value);
+  double error = value - int_result;
+  switch (round_mode) {
+    case FPTieAway: {
+      // Take care of correctly handling the range ]-0.5, -0.0], which must
+      // yield -0.0.
+      if ((-0.5 < value) && (value < 0.0)) {
+        int_result = -0.0;
+
+      } else if ((error > 0.5) || ((error == 0.5) && (int_result >= 0.0))) {
+        // If the error is greater than 0.5, or is equal to 0.5 and the integer
+        // result is positive, round up.
+        int_result++;
+      }
+      break;
+    }
+    case FPTieEven: {
+      // Take care of correctly handling the range [-0.5, -0.0], which must
+      // yield -0.0.
+      if ((-0.5 <= value) && (value < 0.0)) {
+        int_result = -0.0;
+
+        // If the error is greater than 0.5, or is equal to 0.5 and the integer
+        // result is odd, round up.
+      } else if ((error > 0.5) ||
+                 ((error == 0.5) && (std::fmod(int_result, 2) != 0))) {
+        int_result++;
+      }
+      break;
+    }
+    case FPZero: {
+      // If value>0 then we take floor(value)
+      // otherwise, ceil(value).
+      if (value < 0) {
+        int_result = ceil(value);
+      }
+      break;
+    }
+    case FPNegativeInfinity: {
+      // We always use floor(value).
+      break;
+    }
+    case FPPositiveInfinity: {
+      // Take care of correctly handling the range ]-1.0, -0.0], which must
+      // yield -0.0.
+      if ((-1.0 < value) && (value < 0.0)) {
+        int_result = -0.0;
+
+        // If the error is non-zero, round up.
+      } else if (error > 0.0) {
+        int_result++;
+      }
+      break;
+    }
+    default:
+      UNIMPLEMENTED();
+  }
+  return int_result;
+}
+
+int32_t Simulator::FPToInt32(double value, FPRounding rmode) {
+  value = FPRoundInt(value, rmode);
+  if (value >= kWMaxInt) {
+    return kWMaxInt;
+  } else if (value < kWMinInt) {
+    return kWMinInt;
+  }
+  return std::isnan(value) ? 0 : static_cast<int32_t>(value);
+}
+
+int64_t Simulator::FPToInt64(double value, FPRounding rmode) {
+  value = FPRoundInt(value, rmode);
+  if (value >= kXMaxInt) {
+    return kXMaxInt;
+  } else if (value < kXMinInt) {
+    return kXMinInt;
+  }
+  return std::isnan(value) ? 0 : static_cast<int64_t>(value);
+}
+
+uint32_t Simulator::FPToUInt32(double value, FPRounding rmode) {
+  value = FPRoundInt(value, rmode);
+  if (value >= kWMaxUInt) {
+    return kWMaxUInt;
+  } else if (value < 0.0) {
+    return 0;
+  }
+  return std::isnan(value) ? 0 : static_cast<uint32_t>(value);
+}
+
+uint64_t Simulator::FPToUInt64(double value, FPRounding rmode) {
+  value = FPRoundInt(value, rmode);
+  if (value >= kXMaxUInt) {
+    return kXMaxUInt;
+  } else if (value < 0.0) {
+    return 0;
+  }
+  return std::isnan(value) ? 0 : static_cast<uint64_t>(value);
+}
+
+#define DEFINE_NEON_FP_VECTOR_OP(FN, OP, PROCNAN)                      \
+  template <typename T>                                                \
+  LogicVRegister Simulator::FN(VectorFormat vform, LogicVRegister dst, \
+                               const LogicVRegister& src1,             \
+                               const LogicVRegister& src2) {           \
+    dst.ClearForWrite(vform);                                          \
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {             \
+      T op1 = src1.Float<T>(i);                                        \
+      T op2 = src2.Float<T>(i);                                        \
+      T result;                                                        \
+      if (PROCNAN) {                                                   \
+        result = FPProcessNaNs(op1, op2);                              \
+        if (!std::isnan(result)) {                                     \
+          result = OP(op1, op2);                                       \
+        }                                                              \
+      } else {                                                         \
+        result = OP(op1, op2);                                         \
+      }                                                                \
+      dst.SetFloat(i, result);                                         \
+    }                                                                  \
+    return dst;                                                        \
+  }                                                                    \
+                                                                       \
+  LogicVRegister Simulator::FN(VectorFormat vform, LogicVRegister dst, \
+                               const LogicVRegister& src1,             \
+                               const LogicVRegister& src2) {           \
+    if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {               \
+      FN<float>(vform, dst, src1, src2);                               \
+    } else {                                                           \
+      DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);          \
+      FN<double>(vform, dst, src1, src2);                              \
+    }                                                                  \
+    return dst;                                                        \
+  }
+NEON_FP3SAME_LIST(DEFINE_NEON_FP_VECTOR_OP)
+#undef DEFINE_NEON_FP_VECTOR_OP
+
+LogicVRegister Simulator::fnmul(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2) {
+  SimVRegister temp;
+  LogicVRegister product = fmul(vform, temp, src1, src2);
+  return fneg(vform, dst, product);
+}
+
+template <typename T>
+LogicVRegister Simulator::frecps(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    T op1 = -src1.Float<T>(i);
+    T op2 = src2.Float<T>(i);
+    T result = FPProcessNaNs(op1, op2);
+    dst.SetFloat(i, std::isnan(result) ? result : FPRecipStepFused(op1, op2));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::frecps(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src1,
+                                 const LogicVRegister& src2) {
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    frecps<float>(vform, dst, src1, src2);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    frecps<double>(vform, dst, src1, src2);
+  }
+  return dst;
+}
+
+template <typename T>
+LogicVRegister Simulator::frsqrts(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    T op1 = -src1.Float<T>(i);
+    T op2 = src2.Float<T>(i);
+    T result = FPProcessNaNs(op1, op2);
+    dst.SetFloat(i, std::isnan(result) ? result : FPRSqrtStepFused(op1, op2));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::frsqrts(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2) {
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    frsqrts<float>(vform, dst, src1, src2);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    frsqrts<double>(vform, dst, src1, src2);
+  }
+  return dst;
+}
+
+template <typename T>
+LogicVRegister Simulator::fcmp(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2, Condition cond) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    bool result = false;
+    T op1 = src1.Float<T>(i);
+    T op2 = src2.Float<T>(i);
+    T nan_result = FPProcessNaNs(op1, op2);
+    if (!std::isnan(nan_result)) {
+      switch (cond) {
+        case eq:
+          result = (op1 == op2);
+          break;
+        case ge:
+          result = (op1 >= op2);
+          break;
+        case gt:
+          result = (op1 > op2);
+          break;
+        case le:
+          result = (op1 <= op2);
+          break;
+        case lt:
+          result = (op1 < op2);
+          break;
+        default:
+          UNREACHABLE();
+      }
+    }
+    dst.SetUint(vform, i, result ? MaxUintFromFormat(vform) : 0);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcmp(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2, Condition cond) {
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    fcmp<float>(vform, dst, src1, src2, cond);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    fcmp<double>(vform, dst, src1, src2, cond);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcmp_zero(VectorFormat vform, LogicVRegister dst,
+                                    const LogicVRegister& src, Condition cond) {
+  SimVRegister temp;
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    LogicVRegister zero_reg =
+        dup_immediate(vform, temp, bit_cast<uint32_t>(0.0f));
+    fcmp<float>(vform, dst, src, zero_reg, cond);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    LogicVRegister zero_reg =
+        dup_immediate(vform, temp, bit_cast<uint64_t>(0.0));
+    fcmp<double>(vform, dst, src, zero_reg, cond);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fabscmp(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src1,
+                                  const LogicVRegister& src2, Condition cond) {
+  SimVRegister temp1, temp2;
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    LogicVRegister abs_src1 = fabs_<float>(vform, temp1, src1);
+    LogicVRegister abs_src2 = fabs_<float>(vform, temp2, src2);
+    fcmp<float>(vform, dst, abs_src1, abs_src2, cond);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    LogicVRegister abs_src1 = fabs_<double>(vform, temp1, src1);
+    LogicVRegister abs_src2 = fabs_<double>(vform, temp2, src2);
+    fcmp<double>(vform, dst, abs_src1, abs_src2, cond);
+  }
+  return dst;
+}
+
+template <typename T>
+LogicVRegister Simulator::fmla(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    T op1 = src1.Float<T>(i);
+    T op2 = src2.Float<T>(i);
+    T acc = dst.Float<T>(i);
+    T result = FPMulAdd(acc, op1, op2);
+    dst.SetFloat(i, result);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fmla(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    fmla<float>(vform, dst, src1, src2);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    fmla<double>(vform, dst, src1, src2);
+  }
+  return dst;
+}
+
+template <typename T>
+LogicVRegister Simulator::fmls(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    T op1 = -src1.Float<T>(i);
+    T op2 = src2.Float<T>(i);
+    T acc = dst.Float<T>(i);
+    T result = FPMulAdd(acc, op1, op2);
+    dst.SetFloat(i, result);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fmls(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    fmls<float>(vform, dst, src1, src2);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    fmls<double>(vform, dst, src1, src2);
+  }
+  return dst;
+}
+
+template <typename T>
+LogicVRegister Simulator::fneg(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    T op = src.Float<T>(i);
+    op = -op;
+    dst.SetFloat(i, op);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fneg(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src) {
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    fneg<float>(vform, dst, src);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    fneg<double>(vform, dst, src);
+  }
+  return dst;
+}
+
+template <typename T>
+LogicVRegister Simulator::fabs_(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    T op = src.Float<T>(i);
+    if (copysign(1.0, op) < 0.0) {
+      op = -op;
+    }
+    dst.SetFloat(i, op);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fabs_(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    fabs_<float>(vform, dst, src);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    fabs_<double>(vform, dst, src);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fabd(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2) {
+  SimVRegister temp;
+  fsub(vform, temp, src1, src2);
+  fabs_(vform, dst, temp);
+  return dst;
+}
+
+LogicVRegister Simulator::fsqrt(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      float result = FPSqrt(src.Float<float>(i));
+      dst.SetFloat(i, result);
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      double result = FPSqrt(src.Float<double>(i));
+      dst.SetFloat(i, result);
+    }
+  }
+  return dst;
+}
+
+#define DEFINE_NEON_FP_PAIR_OP(FNP, FN, OP)                             \
+  LogicVRegister Simulator::FNP(VectorFormat vform, LogicVRegister dst, \
+                                const LogicVRegister& src1,             \
+                                const LogicVRegister& src2) {           \
+    SimVRegister temp1, temp2;                                          \
+    uzp1(vform, temp1, src1, src2);                                     \
+    uzp2(vform, temp2, src1, src2);                                     \
+    FN(vform, dst, temp1, temp2);                                       \
+    return dst;                                                         \
+  }                                                                     \
+                                                                        \
+  LogicVRegister Simulator::FNP(VectorFormat vform, LogicVRegister dst, \
+                                const LogicVRegister& src) {            \
+    if (vform == kFormatS) {                                            \
+      float result = OP(src.Float<float>(0), src.Float<float>(1));      \
+      dst.SetFloat(0, result);                                          \
+    } else {                                                            \
+      DCHECK_EQ(vform, kFormatD);                                       \
+      double result = OP(src.Float<double>(0), src.Float<double>(1));   \
+      dst.SetFloat(0, result);                                          \
+    }                                                                   \
+    dst.ClearForWrite(vform);                                           \
+    return dst;                                                         \
+  }
+NEON_FPPAIRWISE_LIST(DEFINE_NEON_FP_PAIR_OP)
+#undef DEFINE_NEON_FP_PAIR_OP
+
+LogicVRegister Simulator::FMinMaxV(VectorFormat vform, LogicVRegister dst,
+                                   const LogicVRegister& src, FPMinMaxOp Op) {
+  DCHECK_EQ(vform, kFormat4S);
+  USE(vform);
+  float result1 = (this->*Op)(src.Float<float>(0), src.Float<float>(1));
+  float result2 = (this->*Op)(src.Float<float>(2), src.Float<float>(3));
+  float result = (this->*Op)(result1, result2);
+  dst.ClearForWrite(kFormatS);
+  dst.SetFloat<float>(0, result);
+  return dst;
+}
+
+LogicVRegister Simulator::fmaxv(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  return FMinMaxV(vform, dst, src, &Simulator::FPMax);
+}
+
+LogicVRegister Simulator::fminv(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  return FMinMaxV(vform, dst, src, &Simulator::FPMin);
+}
+
+LogicVRegister Simulator::fmaxnmv(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src) {
+  return FMinMaxV(vform, dst, src, &Simulator::FPMaxNM);
+}
+
+LogicVRegister Simulator::fminnmv(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src) {
+  return FMinMaxV(vform, dst, src, &Simulator::FPMinNM);
+}
+
+LogicVRegister Simulator::fmul(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2, int index) {
+  dst.ClearForWrite(vform);
+  SimVRegister temp;
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    LogicVRegister index_reg = dup_element(kFormat4S, temp, src2, index);
+    fmul<float>(vform, dst, src1, index_reg);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    LogicVRegister index_reg = dup_element(kFormat2D, temp, src2, index);
+    fmul<double>(vform, dst, src1, index_reg);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fmla(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2, int index) {
+  dst.ClearForWrite(vform);
+  SimVRegister temp;
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    LogicVRegister index_reg = dup_element(kFormat4S, temp, src2, index);
+    fmla<float>(vform, dst, src1, index_reg);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    LogicVRegister index_reg = dup_element(kFormat2D, temp, src2, index);
+    fmla<double>(vform, dst, src1, index_reg);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fmls(VectorFormat vform, LogicVRegister dst,
+                               const LogicVRegister& src1,
+                               const LogicVRegister& src2, int index) {
+  dst.ClearForWrite(vform);
+  SimVRegister temp;
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    LogicVRegister index_reg = dup_element(kFormat4S, temp, src2, index);
+    fmls<float>(vform, dst, src1, index_reg);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    LogicVRegister index_reg = dup_element(kFormat2D, temp, src2, index);
+    fmls<double>(vform, dst, src1, index_reg);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fmulx(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src1,
+                                const LogicVRegister& src2, int index) {
+  dst.ClearForWrite(vform);
+  SimVRegister temp;
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    LogicVRegister index_reg = dup_element(kFormat4S, temp, src2, index);
+    fmulx<float>(vform, dst, src1, index_reg);
+
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    LogicVRegister index_reg = dup_element(kFormat2D, temp, src2, index);
+    fmulx<double>(vform, dst, src1, index_reg);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::frint(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src,
+                                FPRounding rounding_mode,
+                                bool inexact_exception) {
+  dst.ClearForWrite(vform);
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      float input = src.Float<float>(i);
+      float rounded = FPRoundInt(input, rounding_mode);
+      if (inexact_exception && !std::isnan(input) && (input != rounded)) {
+        FPProcessException();
+      }
+      dst.SetFloat<float>(i, rounded);
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      double input = src.Float<double>(i);
+      double rounded = FPRoundInt(input, rounding_mode);
+      if (inexact_exception && !std::isnan(input) && (input != rounded)) {
+        FPProcessException();
+      }
+      dst.SetFloat<double>(i, rounded);
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcvts(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src,
+                                FPRounding rounding_mode, int fbits) {
+  dst.ClearForWrite(vform);
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      float op = src.Float<float>(i) * std::pow(2.0f, fbits);
+      dst.SetInt(vform, i, FPToInt32(op, rounding_mode));
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      double op = src.Float<double>(i) * std::pow(2.0, fbits);
+      dst.SetInt(vform, i, FPToInt64(op, rounding_mode));
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcvtu(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src,
+                                FPRounding rounding_mode, int fbits) {
+  dst.ClearForWrite(vform);
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      float op = src.Float<float>(i) * std::pow(2.0f, fbits);
+      dst.SetUint(vform, i, FPToUInt32(op, rounding_mode));
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      double op = src.Float<double>(i) * std::pow(2.0, fbits);
+      dst.SetUint(vform, i, FPToUInt64(op, rounding_mode));
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcvtl(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    for (int i = LaneCountFromFormat(vform) - 1; i >= 0; i--) {
+      dst.SetFloat(i, FPToFloat(src.Float<float16>(i)));
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    for (int i = LaneCountFromFormat(vform) - 1; i >= 0; i--) {
+      dst.SetFloat(i, FPToDouble(src.Float<float>(i)));
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcvtl2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  int lane_count = LaneCountFromFormat(vform);
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    for (int i = 0; i < lane_count; i++) {
+      dst.SetFloat(i, FPToFloat(src.Float<float16>(i + lane_count)));
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    for (int i = 0; i < lane_count; i++) {
+      dst.SetFloat(i, FPToDouble(src.Float<float>(i + lane_count)));
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcvtn(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src) {
+  if (LaneSizeInBytesFromFormat(vform) == kHRegSize) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      dst.SetFloat(i, FPToFloat16(src.Float<float>(i), FPTieEven));
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kSRegSize);
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      dst.SetFloat(i, FPToFloat(src.Float<double>(i), FPTieEven));
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcvtn2(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  int lane_count = LaneCountFromFormat(vform) / 2;
+  if (LaneSizeInBytesFromFormat(vform) == kHRegSize) {
+    for (int i = lane_count - 1; i >= 0; i--) {
+      dst.SetFloat(i + lane_count, FPToFloat16(src.Float<float>(i), FPTieEven));
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kSRegSize);
+    for (int i = lane_count - 1; i >= 0; i--) {
+      dst.SetFloat(i + lane_count, FPToFloat(src.Float<double>(i), FPTieEven));
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcvtxn(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kSRegSize);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    dst.SetFloat(i, FPToFloat(src.Float<double>(i), FPRoundOdd));
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::fcvtxn2(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src) {
+  DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kSRegSize);
+  int lane_count = LaneCountFromFormat(vform) / 2;
+  for (int i = lane_count - 1; i >= 0; i--) {
+    dst.SetFloat(i + lane_count, FPToFloat(src.Float<double>(i), FPRoundOdd));
+  }
+  return dst;
+}
+
+// Based on reference C function recip_sqrt_estimate from ARM ARM.
+double Simulator::recip_sqrt_estimate(double a) {
+  int q0, q1, s;
+  double r;
+  if (a < 0.5) {
+    q0 = static_cast<int>(a * 512.0);
+    r = 1.0 / sqrt((static_cast<double>(q0) + 0.5) / 512.0);
+  } else {
+    q1 = static_cast<int>(a * 256.0);
+    r = 1.0 / sqrt((static_cast<double>(q1) + 0.5) / 256.0);
+  }
+  s = static_cast<int>(256.0 * r + 0.5);
+  return static_cast<double>(s) / 256.0;
+}
+
+namespace {
+
+inline uint64_t Bits(uint64_t val, int start_bit, int end_bit) {
+  return unsigned_bitextract_64(start_bit, end_bit, val);
+}
+
+}  // anonymous namespace
+
+template <typename T>
+T Simulator::FPRecipSqrtEstimate(T op) {
+  static_assert(std::is_same<float, T>::value || std::is_same<double, T>::value,
+                "T must be a float or double");
+
+  if (std::isnan(op)) {
+    return FPProcessNaN(op);
+  } else if (op == 0.0) {
+    if (copysign(1.0, op) < 0.0) {
+      return kFP64NegativeInfinity;
+    } else {
+      return kFP64PositiveInfinity;
+    }
+  } else if (copysign(1.0, op) < 0.0) {
+    FPProcessException();
+    return FPDefaultNaN<T>();
+  } else if (std::isinf(op)) {
+    return 0.0;
+  } else {
+    uint64_t fraction;
+    int32_t exp, result_exp;
+
+    if (sizeof(T) == sizeof(float)) {
+      exp = static_cast<int32_t>(float_exp(op));
+      fraction = float_mantissa(op);
+      fraction <<= 29;
+    } else {
+      exp = static_cast<int32_t>(double_exp(op));
+      fraction = double_mantissa(op);
+    }
+
+    if (exp == 0) {
+      while (Bits(fraction, 51, 51) == 0) {
+        fraction = Bits(fraction, 50, 0) << 1;
+        exp -= 1;
+      }
+      fraction = Bits(fraction, 50, 0) << 1;
+    }
+
+    double scaled;
+    if (Bits(exp, 0, 0) == 0) {
+      scaled = double_pack(0, 1022, Bits(fraction, 51, 44) << 44);
+    } else {
+      scaled = double_pack(0, 1021, Bits(fraction, 51, 44) << 44);
+    }
+
+    if (sizeof(T) == sizeof(float)) {
+      result_exp = (380 - exp) / 2;
+    } else {
+      result_exp = (3068 - exp) / 2;
+    }
+
+    uint64_t estimate = bit_cast<uint64_t>(recip_sqrt_estimate(scaled));
+
+    if (sizeof(T) == sizeof(float)) {
+      uint32_t exp_bits = static_cast<uint32_t>(Bits(result_exp, 7, 0));
+      uint32_t est_bits = static_cast<uint32_t>(Bits(estimate, 51, 29));
+      return float_pack(0, exp_bits, est_bits);
+    } else {
+      return double_pack(0, Bits(result_exp, 10, 0), Bits(estimate, 51, 0));
+    }
+  }
+}
+
+LogicVRegister Simulator::frsqrte(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      float input = src.Float<float>(i);
+      dst.SetFloat(i, FPRecipSqrtEstimate<float>(input));
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      double input = src.Float<double>(i);
+      dst.SetFloat(i, FPRecipSqrtEstimate<double>(input));
+    }
+  }
+  return dst;
+}
+
+template <typename T>
+T Simulator::FPRecipEstimate(T op, FPRounding rounding) {
+  static_assert(std::is_same<float, T>::value || std::is_same<double, T>::value,
+                "T must be a float or double");
+  uint32_t sign;
+
+  if (sizeof(T) == sizeof(float)) {
+    sign = float_sign(op);
+  } else {
+    sign = double_sign(op);
+  }
+
+  if (std::isnan(op)) {
+    return FPProcessNaN(op);
+  } else if (std::isinf(op)) {
+    return (sign == 1) ? -0.0 : 0.0;
+  } else if (op == 0.0) {
+    FPProcessException();  // FPExc_DivideByZero exception.
+    return (sign == 1) ? kFP64NegativeInfinity : kFP64PositiveInfinity;
+  } else if (((sizeof(T) == sizeof(float)) &&
+              (std::fabs(op) < std::pow(2.0, -128.0))) ||
+             ((sizeof(T) == sizeof(double)) &&
+              (std::fabs(op) < std::pow(2.0, -1024.0)))) {
+    bool overflow_to_inf = false;
+    switch (rounding) {
+      case FPTieEven:
+        overflow_to_inf = true;
+        break;
+      case FPPositiveInfinity:
+        overflow_to_inf = (sign == 0);
+        break;
+      case FPNegativeInfinity:
+        overflow_to_inf = (sign == 1);
+        break;
+      case FPZero:
+        overflow_to_inf = false;
+        break;
+      default:
+        break;
+    }
+    FPProcessException();  // FPExc_Overflow and FPExc_Inexact.
+    if (overflow_to_inf) {
+      return (sign == 1) ? kFP64NegativeInfinity : kFP64PositiveInfinity;
+    } else {
+      // Return FPMaxNormal(sign).
+      if (sizeof(T) == sizeof(float)) {
+        return float_pack(sign, 0xfe, 0x07fffff);
+      } else {
+        return double_pack(sign, 0x7fe, 0x0fffffffffffffl);
+      }
+    }
+  } else {
+    uint64_t fraction;
+    int32_t exp, result_exp;
+    uint32_t sign;
+
+    if (sizeof(T) == sizeof(float)) {
+      sign = float_sign(op);
+      exp = static_cast<int32_t>(float_exp(op));
+      fraction = float_mantissa(op);
+      fraction <<= 29;
+    } else {
+      sign = double_sign(op);
+      exp = static_cast<int32_t>(double_exp(op));
+      fraction = double_mantissa(op);
+    }
+
+    if (exp == 0) {
+      if (Bits(fraction, 51, 51) == 0) {
+        exp -= 1;
+        fraction = Bits(fraction, 49, 0) << 2;
+      } else {
+        fraction = Bits(fraction, 50, 0) << 1;
+      }
+    }
+
+    double scaled = double_pack(0, 1022, Bits(fraction, 51, 44) << 44);
+
+    if (sizeof(T) == sizeof(float)) {
+      result_exp = 253 - exp;
+    } else {
+      result_exp = 2045 - exp;
+    }
+
+    double estimate = recip_estimate(scaled);
+
+    fraction = double_mantissa(estimate);
+    if (result_exp == 0) {
+      fraction = (UINT64_C(1) << 51) | Bits(fraction, 51, 1);
+    } else if (result_exp == -1) {
+      fraction = (UINT64_C(1) << 50) | Bits(fraction, 51, 2);
+      result_exp = 0;
+    }
+    if (sizeof(T) == sizeof(float)) {
+      uint32_t exp_bits = static_cast<uint32_t>(Bits(result_exp, 7, 0));
+      uint32_t frac_bits = static_cast<uint32_t>(Bits(fraction, 51, 29));
+      return float_pack(sign, exp_bits, frac_bits);
+    } else {
+      return double_pack(sign, Bits(result_exp, 10, 0), Bits(fraction, 51, 0));
+    }
+  }
+}
+
+LogicVRegister Simulator::frecpe(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src, FPRounding round) {
+  dst.ClearForWrite(vform);
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      float input = src.Float<float>(i);
+      dst.SetFloat(i, FPRecipEstimate<float>(input, round));
+    }
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+      double input = src.Float<double>(i);
+      dst.SetFloat(i, FPRecipEstimate<double>(input, round));
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::ursqrte(VectorFormat vform, LogicVRegister dst,
+                                  const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  uint64_t operand;
+  uint32_t result;
+  double dp_operand, dp_result;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    operand = src.Uint(vform, i);
+    if (operand <= 0x3FFFFFFF) {
+      result = 0xFFFFFFFF;
+    } else {
+      dp_operand = operand * std::pow(2.0, -32);
+      dp_result = recip_sqrt_estimate(dp_operand) * std::pow(2.0, 31);
+      result = static_cast<uint32_t>(dp_result);
+    }
+    dst.SetUint(vform, i, result);
+  }
+  return dst;
+}
+
+// Based on reference C function recip_estimate from ARM ARM.
+double Simulator::recip_estimate(double a) {
+  int q, s;
+  double r;
+  q = static_cast<int>(a * 512.0);
+  r = 1.0 / ((static_cast<double>(q) + 0.5) / 512.0);
+  s = static_cast<int>(256.0 * r + 0.5);
+  return static_cast<double>(s) / 256.0;
+}
+
+LogicVRegister Simulator::urecpe(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  uint64_t operand;
+  uint32_t result;
+  double dp_operand, dp_result;
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    operand = src.Uint(vform, i);
+    if (operand <= 0x7FFFFFFF) {
+      result = 0xFFFFFFFF;
+    } else {
+      dp_operand = operand * std::pow(2.0, -32);
+      dp_result = recip_estimate(dp_operand) * std::pow(2.0, 31);
+      result = static_cast<uint32_t>(dp_result);
+    }
+    dst.SetUint(vform, i, result);
+  }
+  return dst;
+}
+
+template <typename T>
+LogicVRegister Simulator::frecpx(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  dst.ClearForWrite(vform);
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    T op = src.Float<T>(i);
+    T result;
+    if (std::isnan(op)) {
+      result = FPProcessNaN(op);
+    } else {
+      int exp;
+      uint32_t sign;
+      if (sizeof(T) == sizeof(float)) {
+        sign = float_sign(op);
+        exp = static_cast<int>(float_exp(op));
+        exp = (exp == 0) ? (0xFF - 1) : static_cast<int>(Bits(~exp, 7, 0));
+        result = float_pack(sign, exp, 0);
+      } else {
+        sign = double_sign(op);
+        exp = static_cast<int>(double_exp(op));
+        exp = (exp == 0) ? (0x7FF - 1) : static_cast<int>(Bits(~exp, 10, 0));
+        result = double_pack(sign, exp, 0);
+      }
+    }
+    dst.SetFloat(i, result);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::frecpx(VectorFormat vform, LogicVRegister dst,
+                                 const LogicVRegister& src) {
+  if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+    frecpx<float>(vform, dst, src);
+  } else {
+    DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+    frecpx<double>(vform, dst, src);
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::scvtf(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int fbits,
+                                FPRounding round) {
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+      float result = FixedToFloat(src.Int(kFormatS, i), fbits, round);
+      dst.SetFloat<float>(i, result);
+    } else {
+      DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+      double result = FixedToDouble(src.Int(kFormatD, i), fbits, round);
+      dst.SetFloat<double>(i, result);
+    }
+  }
+  return dst;
+}
+
+LogicVRegister Simulator::ucvtf(VectorFormat vform, LogicVRegister dst,
+                                const LogicVRegister& src, int fbits,
+                                FPRounding round) {
+  for (int i = 0; i < LaneCountFromFormat(vform); i++) {
+    if (LaneSizeInBytesFromFormat(vform) == kSRegSize) {
+      float result = UFixedToFloat(src.Uint(kFormatS, i), fbits, round);
+      dst.SetFloat<float>(i, result);
+    } else {
+      DCHECK_EQ(LaneSizeInBytesFromFormat(vform), kDRegSize);
+      double result = UFixedToDouble(src.Uint(kFormatD, i), fbits, round);
+      dst.SetFloat<double>(i, result);
+    }
+  }
+  return dst;
+}
+
+#endif  // USE_SIMULATOR
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_TARGET_ARCH_ARM64