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 //
 // Copyright 2017 The Abseil Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 // This file contains :int128 implementation details that depend on internal
 // representation when ABSL_HAVE_INTRINSIC_INT128 is defined. This file is
 // included by int128.h and relies on ABSL_INTERNAL_WCHAR_T being defined.
 
 namespace int128_internal {
 
 // Casts from unsigned to signed while preserving the underlying binary
 // representation.
 constexpr __int128 BitCastToSigned(unsigned __int128 v) {
   // Casting an unsigned integer to a signed integer of the same
   // width is implementation defined behavior if the source value would not fit
   // in the destination type. We step around it with a roundtrip bitwise not
   // operation to make sure this function remains constexpr. Clang and GCC
   // optimize this to a no-op on x86-64.
   return v & (static_cast<unsigned __int128>(1) << 127)
              ? ~static_cast<__int128>(~v)
              : static_cast<__int128>(v);
 }
 
 }  // namespace int128_internal
 
 inline int128& int128::operator=(__int128 v) {
   v_ = v;
   return *this;
 }
 
 constexpr uint64_t Int128Low64(int128 v) {
   return static_cast<uint64_t>(v.v_ & ~uint64_t{0});
 }
 
 constexpr int64_t Int128High64(int128 v) {
   // Initially cast to unsigned to prevent a right shift on a negative value.
   return int128_internal::BitCastToSigned(
       static_cast<uint64_t>(static_cast<unsigned __int128>(v.v_) >> 64));
 }
 
 constexpr int128::int128(int64_t high, uint64_t low)
     // Initially cast to unsigned to prevent a left shift that overflows.
     : v_(int128_internal::BitCastToSigned(static_cast<unsigned __int128>(high)
                                            << 64) |
          low) {}
 
 
 constexpr int128::int128(int v) : v_{v} {}
 
 constexpr int128::int128(long v) : v_{v} {}       // NOLINT(runtime/int)
 
 constexpr int128::int128(long long v) : v_{v} {}  // NOLINT(runtime/int)
 
 constexpr int128::int128(__int128 v) : v_{v} {}
 
 constexpr int128::int128(unsigned int v) : v_{v} {}
 
 constexpr int128::int128(unsigned long v) : v_{v} {}  // NOLINT(runtime/int)
 
 // NOLINTNEXTLINE(runtime/int)
 constexpr int128::int128(unsigned long long v) : v_{v} {}
 
 constexpr int128::int128(unsigned __int128 v) : v_{static_cast<__int128>(v)} {}
 
 inline int128::int128(float v) {
   v_ = static_cast<__int128>(v);
 }
 
 inline int128::int128(double v) {
   v_ = static_cast<__int128>(v);
 }
 
 inline int128::int128(long double v) {
   v_ = static_cast<__int128>(v);
 }
 
 constexpr int128::int128(uint128 v) : v_{static_cast<__int128>(v)} {}
 
 constexpr int128::operator bool() const { return static_cast<bool>(v_); }
 
 constexpr int128::operator char() const { return static_cast<char>(v_); }
 
 constexpr int128::operator signed char() const {
   return static_cast<signed char>(v_);
 }
 
 constexpr int128::operator unsigned char() const {
   return static_cast<unsigned char>(v_);
 }
 
 constexpr int128::operator char16_t() const {
   return static_cast<char16_t>(v_);
 }
 
 constexpr int128::operator char32_t() const {
   return static_cast<char32_t>(v_);
 }
 
 constexpr int128::operator ABSL_INTERNAL_WCHAR_T() const {
   return static_cast<ABSL_INTERNAL_WCHAR_T>(v_);
 }
 
 constexpr int128::operator short() const {  // NOLINT(runtime/int)
   return static_cast<short>(v_);            // NOLINT(runtime/int)
 }
 
 constexpr int128::operator unsigned short() const {  // NOLINT(runtime/int)
   return static_cast<unsigned short>(v_);            // NOLINT(runtime/int)
 }
 
 constexpr int128::operator int() const {
   return static_cast<int>(v_);
 }
 
 constexpr int128::operator unsigned int() const {
   return static_cast<unsigned int>(v_);
 }
 
 constexpr int128::operator long() const {  // NOLINT(runtime/int)
   return static_cast<long>(v_);            // NOLINT(runtime/int)
 }
 
 constexpr int128::operator unsigned long() const {  // NOLINT(runtime/int)
   return static_cast<unsigned long>(v_);            // NOLINT(runtime/int)
 }
 
 constexpr int128::operator long long() const {  // NOLINT(runtime/int)
   return static_cast<long long>(v_);            // NOLINT(runtime/int)
 }
 
 constexpr int128::operator unsigned long long() const {  // NOLINT(runtime/int)
   return static_cast<unsigned long long>(v_);            // NOLINT(runtime/int)
 }
 
 constexpr int128::operator __int128() const { return v_; }
 
 constexpr int128::operator unsigned __int128() const {
   return static_cast<unsigned __int128>(v_);
 }
 
 // Clang on PowerPC sometimes produces incorrect __int128 to floating point
 // conversions. In that case, we do the conversion with a similar implementation
 // to the conversion operators in int128_no_intrinsic.inc.
 #if defined(__clang__) && !defined(__ppc64__)
 inline int128::operator float() const { return static_cast<float>(v_); }
 
 inline int128::operator double() const { return static_cast<double>(v_); }
 
 inline int128::operator long double() const {
   return static_cast<long double>(v_);
 }
 
 #else  // Clang on PowerPC
 
 inline int128::operator float() const {
   // We must convert the absolute value and then negate as needed, because
   // floating point types are typically sign-magnitude. Otherwise, the
   // difference between the high and low 64 bits when interpreted as two's
   // complement overwhelms the precision of the mantissa.
   //
   // Also check to make sure we don't negate Int128Min()
   return v_ < 0 && *this != Int128Min()
              ? -static_cast<float>(-*this)
              : static_cast<float>(Int128Low64(*this)) +
                    std::ldexp(static_cast<float>(Int128High64(*this)), 64);
 }
 
 inline int128::operator double() const {
   // See comment in int128::operator float() above.
   return v_ < 0 && *this != Int128Min()
              ? -static_cast<double>(-*this)
              : static_cast<double>(Int128Low64(*this)) +
                    std::ldexp(static_cast<double>(Int128High64(*this)), 64);
 }
 
 inline int128::operator long double() const {
   // See comment in int128::operator float() above.
   return v_ < 0 && *this != Int128Min()
              ? -static_cast<long double>(-*this)
              : static_cast<long double>(Int128Low64(*this)) +
                    std::ldexp(static_cast<long double>(Int128High64(*this)),
                               64);
 }
 #endif  // Clang on PowerPC
 
 // Comparison operators.
 
 constexpr bool operator==(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) == static_cast<__int128>(rhs);
 }
 
 constexpr bool operator!=(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) != static_cast<__int128>(rhs);
 }
 
 constexpr bool operator<(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) < static_cast<__int128>(rhs);
 }
 
 constexpr bool operator>(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) > static_cast<__int128>(rhs);
 }
 
 constexpr bool operator<=(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) <= static_cast<__int128>(rhs);
 }
 
 constexpr bool operator>=(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) >= static_cast<__int128>(rhs);
 }
 
 #ifdef __cpp_impl_three_way_comparison
 constexpr absl::strong_ordering operator<=>(int128 lhs, int128 rhs) {
   if (auto lhs_128 = static_cast<__int128>(lhs),
       rhs_128 = static_cast<__int128>(rhs);
       lhs_128 < rhs_128) {
     return absl::strong_ordering::less;
   } else if (lhs_128 > rhs_128) {
     return absl::strong_ordering::greater;
   } else {
     return absl::strong_ordering::equal;
   }
 }
 #endif
 
 // Unary operators.
 
 constexpr int128 operator-(int128 v) { return -static_cast<__int128>(v); }
 
 constexpr bool operator!(int128 v) { return !static_cast<__int128>(v); }
 
 constexpr int128 operator~(int128 val) { return ~static_cast<__int128>(val); }
 
 // Arithmetic operators.
 
 constexpr int128 operator+(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) + static_cast<__int128>(rhs);
 }
 
 constexpr int128 operator-(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) - static_cast<__int128>(rhs);
 }
 
 inline int128 operator*(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) * static_cast<__int128>(rhs);
 }
 
 inline int128 operator/(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) / static_cast<__int128>(rhs);
 }
 
 inline int128 operator%(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) % static_cast<__int128>(rhs);
 }
 
 inline int128 int128::operator++(int) {
   int128 tmp(*this);
   ++v_;
   return tmp;
 }
 
 inline int128 int128::operator--(int) {
   int128 tmp(*this);
   --v_;
   return tmp;
 }
 
 inline int128& int128::operator++() {
   ++v_;
   return *this;
 }
 
 inline int128& int128::operator--() {
   --v_;
   return *this;
 }
 
 constexpr int128 operator|(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) | static_cast<__int128>(rhs);
 }
 
 constexpr int128 operator&(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) & static_cast<__int128>(rhs);
 }
 
 constexpr int128 operator^(int128 lhs, int128 rhs) {
   return static_cast<__int128>(lhs) ^ static_cast<__int128>(rhs);
 }
 
 constexpr int128 operator<<(int128 lhs, int amount) {
   return static_cast<__int128>(lhs) << amount;
 }
 
 constexpr int128 operator>>(int128 lhs, int amount) {
   return static_cast<__int128>(lhs) >> amount;
 }

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