Revision control
++ // Copyright (C) 2016 The Qt Company Ltd.
++ // Copyright (C) 2018 Intel Corporation.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant reason:default
++
++ #include "qendian.h"
++
++ #include "qalgorithms.h"
++ #include <private/qsimd_p.h>
++
++ QT_BEGIN_NAMESPACE
++
++ /*!
++ \headerfile <QtEndian>
++ \inmodule QtCore
++ \title Endian Conversion Functions
++ \ingroup funclists
++ \brief The <QtEndian> header provides functions to convert between
++ little and big endian representations of numbers.
++ */
++
++ /*!
++ \fn template <typename T> T qFromUnaligned(const void *ptr)
++ \internal
++ \since 5.5
++
++ Loads a \c{T} from address \a ptr, which may be misaligned.
++
++ Use of this function avoids the undefined behavior that the C++ standard
++ otherwise attributes to unaligned loads.
++ */
++
++ /*!
++ \fn template <typename T> void qToUnaligned(const T t, void *ptr)
++ \internal
++ \since 4.5
++
++ Stores \a t to address \a ptr, which may be misaligned.
++
++ Use of this function avoids the undefined behavior that the C++ standard
++ otherwise attributes to unaligned stores.
++ */
++
++
++ /*!
++ \fn template <typename T> T qFromBigEndian(const void *src)
++ \since 4.3
++ \relates <QtEndian>
++
++ Reads a big-endian number from memory location \a src and returns the number in the
++ host byte order representation.
++ On CPU architectures where the host byte order is little-endian (such as x86) this
++ will swap the byte order; otherwise it will just read from \a src.
++
++ \note Template type \c{T} can either be a quint16, qint16, quint32, qint32,
++ quint64, or qint64. Other types of integers, e.g., qlong, are not
++ applicable.
++
++ \note Since Qt 5.7, the type of the \a src parameter is a void pointer.
++
++ There are no data alignment constraints for \a src.
++
++ \sa qFromLittleEndian()
++ \sa qToBigEndian()
++ \sa qToLittleEndian()
++ */
++ /*!
++ \fn template <typename T> T qFromBigEndian(T src)
++ \since 4.3
++ \relates <QtEndian>
++ \overload
++
++ Converts \a src from big-endian byte order and returns the number in host byte order
++ representation of that number.
++ On CPU architectures where the host byte order is little-endian (such as x86) this
++ will return \a src with the byte order swapped; otherwise it will return \a src
++ unmodified.
++ */
++ /*!
++ \fn template <typename T> T qFromBigEndian(const void *src, qsizetype count, void *dest)
++ \since 5.12
++ \relates <QtEndian>
++
++ Reads \a count big-endian numbers from memory location \a src and stores
++ them in the host byte order representation at \a dest. On CPU architectures
++ where the host byte order is little-endian (such as x86) this will swap the
++ byte order; otherwise it will just perform a \c memcpy from \a src to \a
++ dest.
++
++ \note Template type \c{T} can either be a quint16, qint16, quint32, qint32,
++ quint64, or qint64. Other types of integers, e.g., qlong, are not
++ applicable.
++
++ There are no data alignment constraints for \a src. However, \a dest is
++ expected to be naturally aligned for type \c{T}.
++
++ If \a src and \a dest can be the same pointer, this function will perform
++ an in-place swap (if necessary). If they are not the same, the memory
++ regions must not overlap.
++
++ \sa qFromLittleEndian()
++ \sa qToBigEndian()
++ \sa qToLittleEndian()
++ */
++ /*!
++ \fn template <typename T> inline T qFromLittleEndian(const void *src)
++ \since 4.3
++ \relates <QtEndian>
++
++ Reads a little-endian number from memory location \a src and returns the number in
++ the host byte order representation.
++ On CPU architectures where the host byte order is big-endian (such as PowerPC) this
++ will swap the byte order; otherwise it will just read from \a src.
++
++ \note Template type \c{T} can either be a quint16, qint16, quint32, qint32,
++ quint64, or qint64. Other types of integers, e.g., qlong, are not
++ applicable.
++
++ \note Since Qt 5.7, the type of the \a src parameter is a void pointer.
++
++ There are no data alignment constraints for \a src.
++
++ \sa qFromBigEndian()
++ \sa qToBigEndian()
++ \sa qToLittleEndian()
++ */
++ /*!
++ \fn template <typename T> inline T qFromLittleEndian(T src)
++ \since 4.3
++ \relates <QtEndian>
++ \overload
++
++ Converts \a src from little-endian byte order and returns the number in host byte
++ order representation of that number.
++ On CPU architectures where the host byte order is big-endian (such as PowerPC) this
++ will return \a src with the byte order swapped; otherwise it will return \a src
++ unmodified.
++ */
++ /*!
++ \fn template <typename T> inline T qFromLittleEndian(const void *src, qsizetype count, void *dest)
++ \since 5.12
++ \relates <QtEndian>
++
++ Reads \a count little-endian numbers from memory location \a src and stores
++ them in the host byte order representation at \a dest. On CPU architectures
++ where the host byte order is big-endian (such as PowerPC) this will swap the
++ byte order; otherwise it will just perform a \c memcpy from \a src to \a
++ dest.
++
++ \note Template type \c{T} can either be a quint16, qint16, quint32, qint32,
++ quint64, or qint64. Other types of integers, e.g., qlong, are not
++ applicable.
++
++ There are no data alignment constraints for \a src. However, \a dest is
++ expected to be naturally aligned for type \c{T}.
++
++ If \a src and \a dest can be the same pointer, this function will perform
++ an in-place swap (if necessary). If they are not the same, the memory
++ regions must not overlap.
++
++ \sa qToBigEndian()
++ \sa qToLittleEndian()
++ */
++ /*!
++ \fn template <typename T> void qToBigEndian(T src, void *dest)
++ \since 4.3
++ \relates <QtEndian>
++
++ Writes the number \a src with template type \c{T} to the memory location at \a dest
++ in big-endian byte order.
++
++ \note Template type \c{T} can either be a quint16, qint16, quint32, qint32,
++ quint64, or qint64. Other types of integers, e.g., qlong, are not
++ applicable.
++
++ There are no data alignment constraints for \a dest.
++
++ \note Since Qt 5.7, the type of the \a dest parameter is a void pointer.
++
++ \sa qFromBigEndian()
++ \sa qFromLittleEndian()
++ \sa qToLittleEndian()
++ */
++ /*!
++ \fn template <typename T> T qToBigEndian(T src)
++ \since 4.3
++ \relates <QtEndian>
++ \overload
++
++ Converts \a src from host byte order and returns the number in big-endian byte order
++ representation of that number.
++ On CPU architectures where the host byte order is little-endian (such as x86) this
++ will return \a src with the byte order swapped; otherwise it will return \a src
++ unmodified.
++ */
++ /*!
++ \fn template <typename T> T qToBigEndian(const void *src, qsizetype count, void *dest)
++ \since 5.12
++ \relates <QtEndian>
++
++ Reads \a count numbers from memory location \a src in the host byte order
++ and stores them in big-endian representation at \a dest. On CPU
++ architectures where the host byte order is little-endian (such as x86) this
++ will swap the byte order; otherwise it will just perform a \c memcpy from
++ \a src to \a dest.
++
++ \note Template type \c{T} can either be a quint16, qint16, quint32, qint32,
++ quint64, or qint64. Other types of integers, e.g., qlong, are not
++ applicable.
++
++ There are no data alignment constraints for \a dest. However, \a src is
++ expected to be naturally aligned for type \c{T}.
++
++ If \a src and \a dest can be the same pointer, this function will perform
++ an in-place swap (if necessary). If they are not the same, the memory
++ regions must not overlap.
++
++ \sa qFromLittleEndian()
++ \sa qToBigEndian()
++ \sa qToLittleEndian()
++ */
++ /*!
++ \fn template <typename T> void qToLittleEndian(T src, void *dest)
++ \since 4.3
++ \relates <QtEndian>
++
++ Writes the number \a src with template type \c{T} to the memory location at \a dest
++ in little-endian byte order.
++
++ \note Template type \c{T} can either be a quint16, qint16, quint32, qint32,
++ quint64, or qint64. Other types of integers, e.g., qlong, are not
++ applicable.
++
++ There are no data alignment constraints for \a dest.
++
++ \note Since Qt 5.7, the type of the \a dest parameter is a void pointer.
++
++ \sa qFromBigEndian()
++ \sa qFromLittleEndian()
++ \sa qToBigEndian()
++ */
++ /*!
++ \fn template <typename T> T qToLittleEndian(T src)
++ \since 4.3
++ \relates <QtEndian>
++ \overload
++
++ Converts \a src from host byte order and returns the number in little-endian byte
++ order representation of that number.
++ On CPU architectures where the host byte order is big-endian (such as PowerPC) this
++ will return \a src with the byte order swapped; otherwise it will return \a src
++ unmodified.
++ */
++ /*!
++ \fn template <typename T> T qToLittleEndian(const void *src, qsizetype count, void *dest)
++ \since 5.12
++ \relates <QtEndian>
++
++ Reads \a count numbers from memory location \a src in the host byte order
++ and stores them in little-endian representation at \a dest. On CPU
++ architectures where the host byte order is big-endian (such as PowerPC)
++ this will swap the byte order; otherwise it will just perform a \c memcpy
++ from \a src to \a dest.
++
++ \note Template type \c{T} can either be a quint16, qint16, quint32, qint32,
++ quint64, or qint64. Other types of integers, e.g., qlong, are not
++ applicable.
++
++ There are no data alignment constraints for \a dest. However, \a src is
++ expected to be naturally aligned for type \c{T}.
++
++ If \a src and \a dest can be the same pointer, this function will perform
++ an in-place swap (if necessary). If they are not the same, the memory
++ regions must not overlap.
++
++ \sa qFromLittleEndian()
++ \sa qToBigEndian()
++ \sa qToLittleEndian()
++ */
++
++ /*!
++ \class QLEInteger
++ \inmodule QtCore
++ \brief The QLEInteger class provides platform-independent little-endian integers.
++ \since 5.10
++
++ QLEInteger\<T\> stores an integer value in little-endian byte order, where
++ \a T specifies the underlying C++ integer type. The template parameter \a T
++ must be a C++ integer type:
++ \list
++ \li 8-bit: char, signed char, unsigned char, qint8, quint8
++ \li 16-bit: short, unsigned short, qint16, quint16, char16_t
++ \li 32-bit: int, unsigned int, qint32, quint32, char32_t
++ \li 64-bit: long long, unsigned long long, qint64, quint64
++ \li platform-specific size: long, unsigned long
++ \li pointer size: qintptr, quintptr, qptrdiff
++ \endlist
++
++ \note Using this class may be slower than using native integers, so only use it when
++ an exact endianness is needed.
++ */
++
++ /*! \fn template <typename T> QLEInteger<T>::QLEInteger(T value)
++
++ Constructs a QLEInteger with the given \a value.
++ */
++
++ /*! \fn template <typename T> QLEInteger &QLEInteger<T>::operator=(T i)
++
++ Assigns \a i to this QLEInteger and returns a reference to
++ this QLEInteger.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger<T>::operator T() const
++
++ Returns the value of this QLEInteger as a native integer.
++ */
++
++ /*!
++ \fn template <typename T> bool QLEInteger<T>::operator==(QLEInteger other) const
++
++ Returns \c true if the value of this QLEInteger is equal to the value of \a other.
++ */
++
++ /*!
++ \fn template <typename T> bool QLEInteger<T>::operator!=(QLEInteger other) const
++
++ Returns \c true if the value of this QLEInteger is not equal to the value of \a other.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator+=(T i)
++
++ Adds \a i to this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator-=(T i)
++
++ Subtracts \a i from this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator*=(T i)
++
++ Multiplies \a i with this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator/=(T i)
++
++ Divides this QLEInteger with \a i and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator%=(T i)
++
++ Sets this QLEInteger to the remainder of a division by \a i and
++ returns a reference to this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator>>=(T i)
++
++ Performs a left-shift by \a i on this QLEInteger and returns a
++ reference to this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator<<=(T i)
++
++ Performs a right-shift by \a i on this QLEInteger and returns a
++ reference to this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator|=(T i)
++
++ Performs a bitwise OR with \a i onto this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator&=(T i)
++
++ Performs a bitwise AND with \a i onto this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator^=(T i)
++
++ Performs a bitwise XOR with \a i onto this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator++()
++
++ Performs a prefix \c{++} (increment) on this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger QLEInteger<T>::operator++(int)
++
++ Performs a postfix \c{++} (increment) on this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger &QLEInteger<T>::operator--()
++
++ Performs a prefix \c{--} (decrement) on this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger QLEInteger<T>::operator--(int)
++
++ Performs a postfix \c{--} (decrement) on this QLEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger QLEInteger<T>::max()
++
++ Returns the maximum (finite) value representable by the numeric type T.
++ */
++
++ /*!
++ \fn template <typename T> QLEInteger QLEInteger<T>::min()
++
++ Returns the minimum (finite) value representable by the numeric type T.
++ */
++
++ /*!
++ \class QBEInteger
++ \inmodule QtCore
++ \brief The QBEInteger class provides platform-independent big-endian integers.
++ \since 5.10
++
++ QBEInteger\<T\> stores an integer value in big-endian byte order, where
++ \a T specifies the underlying C++ integer type. The template parameter \a T
++ must be a C++ integer type:
++ \list
++ \li 8-bit: char, signed char, unsigned char, qint8, quint8
++ \li 16-bit: short, unsigned short, qint16, quint16, char16_t
++ \li 32-bit: int, unsigned int, qint32, quint32, char32_t
++ \li 64-bit: long long, unsigned long long, qint64, quint64
++ \li platform-specific size: long, unsigned long
++ \li pointer size: qintptr, quintptr, qptrdiff
++ \endlist
++
++ \note Using this class may be slower than using native integers, so only use it when
++ an exact endianness is needed.
++ */
++
++ /*! \fn template <typename T> QBEInteger<T>::QBEInteger(T value)
++
++ Constructs a QBEInteger with the given \a value.
++ */
++
++ /*! \fn template <typename T> QBEInteger &QBEInteger<T>::operator=(T i)
++
++ Assigns \a i to this QBEInteger and returns a reference to
++ this QBEInteger.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger<T>::operator T() const
++
++ Returns the value of this QBEInteger as a native integer.
++ */
++
++ /*!
++ \fn template <typename T> bool QBEInteger<T>::operator==(QBEInteger other) const
++
++ Returns \c true if the value of this QBEInteger is equal to the value of \a other.
++ */
++
++ /*!
++ \fn template <typename T> bool QBEInteger<T>::operator!=(QBEInteger other) const
++
++ Returns \c true if the value of this QBEInteger is not equal to the value of \a other.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator+=(T i)
++
++ Adds \a i to this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator-=(T i)
++
++ Subtracts \a i from this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator*=(T i)
++
++ Multiplies \a i with this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator/=(T i)
++
++ Divides this QBEInteger with \a i and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator%=(T i)
++
++ Sets this QBEInteger to the remainder of a division by \a i and
++ returns a reference to this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator>>=(T i)
++
++ Performs a left-shift by \a i on this QBEInteger and returns a
++ reference to this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator<<=(T i)
++
++ Performs a right-shift by \a i on this QBEInteger and returns a
++ reference to this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator|=(T i)
++
++ Performs a bitwise OR with \a i onto this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator&=(T i)
++
++ Performs a bitwise AND with \a i onto this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator^=(T i)
++
++ Performs a bitwise XOR with \a i onto this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator++()
++
++ Performs a prefix \c{++} (increment) on this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger QBEInteger<T>::operator++(int)
++
++ Performs a postfix \c{++} (increment) on this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger &QBEInteger<T>::operator--()
++
++ Performs a prefix \c{--} (decrement) on this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger QBEInteger<T>::operator--(int)
++
++ Performs a postfix \c{--} (decrement) on this QBEInteger and returns a reference to
++ this object.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger QBEInteger<T>::max()
++
++ Returns the maximum (finite) value representable by the numeric type T.
++ */
++
++ /*!
++ \fn template <typename T> QBEInteger QBEInteger<T>::min()
++
++ Returns the minimum (finite) value representable by the numeric type T.
++ */
++
++ /*!
++ \typedef quint16_le
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QLEInteger<quint16>. This type is guaranteed to be stored in memory as
++ a 16-bit little-endian unsigned integer on all platforms supported by Qt.
++
++ \sa quint16
++ */
++
++ /*!
++ \typedef quint32_le
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QLEInteger<quint32>. This type is guaranteed to be stored in memory as
++ a 32-bit little-endian unsigned integer on all platforms supported by Qt.
++
++ \sa quint32
++ */
++
++ /*!
++ \typedef quint64_le
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QLEInteger<quint64>. This type is guaranteed to be stored in memory as
++ a 64-bit little-endian unsigned integer on all platforms supported by Qt.
++
++ \sa quint64
++ */
++
++ /*!
++ \typedef quint16_be
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QBEInteger<quint16>. This type is guaranteed to be stored in memory as
++ a 16-bit big-endian unsigned integer on all platforms supported by Qt.
++
++ \sa quint16
++ */
++
++ /*!
++ \typedef quint32_be
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QBEInteger<quint32>. This type is guaranteed to be stored in memory as
++ a 32-bit big-endian unsigned integer on all platforms supported by Qt.
++
++ \sa quint32
++ */
++
++ /*!
++ \typedef quint64_be
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QBEInteger<quint64>. This type is guaranteed to be stored in memory as
++ a 64-bit big-endian unsigned integer on all platforms supported by Qt.
++
++ \sa quint64
++ */
++
++ /*!
++ \typedef qint16_le
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QLEInteger<qint16>. This type is guaranteed to be stored in memory as
++ a 16-bit little-endian signed integer on all platforms supported by Qt.
++
++ \sa qint16
++ */
++
++ /*!
++ \typedef qint32_le
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QLEInteger<qint32>. This type is guaranteed to be stored in memory as
++ a 32-bit little-endian signed integer on all platforms supported by Qt.
++
++ \sa qint32
++ */
++
++ /*!
++ \typedef qint64_le
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QLEInteger<qint64>. This type is guaranteed to be stored in memory as
++ a 64-bit little-endian signed integer on all platforms supported by Qt.
++
++ \sa qint64
++ */
++
++ /*!
++ \typedef qint16_be
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QBEInteger<qint16>. This type is guaranteed to be stored in memory as
++ a 16-bit big-endian signed integer on all platforms supported by Qt.
++
++ \sa qint16
++ */
++
++ /*!
++ \typedef qint32_be
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QBEInteger<qint32>. This type is guaranteed to be stored in memory as
++ a 32-bit big-endian signed integer on all platforms supported by Qt.
++
++ \sa qint32
++ */
++
++ /*!
++ \typedef qint64_be
++ \relates <QtEndian>
++ \since 5.10
++
++ Typedef for QBEInteger<qint64>. This type is guaranteed to be stored in memory as
++ a 64-bit big-endian signed integer on all platforms supported by Qt.
++
++ \sa qint64
++ */
++
++ #if defined(__SSSE3__)
++ using ShuffleMask = uchar[16];
++ alignas(16) static const ShuffleMask shuffleMasks[3] = {
++ // 16-bit
++ {1, 0, 3, 2, 5, 4, 7, 6, 9, 8, 11, 10, 13, 12, 15, 14},
++ // 32-bit
++ {3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12},
++ // 64-bit
++ {7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8}
++ };
++
++ static size_t sseSwapLoop(const uchar *src, size_t bytes, uchar *dst,
++ const __m128i *shuffleMaskPtr) noexcept
++ {
++ size_t i = 0;
++ const __m128i shuffleMask = _mm_load_si128(shuffleMaskPtr);
++
++ # ifdef __AVX2__
++ const __m256i shuffleMask256 = _mm256_inserti128_si256(_mm256_castsi128_si256(shuffleMask), shuffleMask, 1);
++ for ( ; i + sizeof(__m256i) <= bytes; i += sizeof(__m256i)) {
++ __m256i data = _mm256_loadu_si256(reinterpret_cast<const __m256i *>(src + i));
++ data = _mm256_shuffle_epi8(data, shuffleMask256);
++ _mm256_storeu_si256(reinterpret_cast<__m256i *>(dst + i), data);
++ }
++ # else
++ for ( ; i + 2 * sizeof(__m128i) <= bytes; i += 2 * sizeof(__m128i)) {
++ __m128i data1 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(src + i));
++ __m128i data2 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(src + i) + 1);
++ data1 = _mm_shuffle_epi8(data1, shuffleMask);
++ data2 = _mm_shuffle_epi8(data2, shuffleMask);
++ _mm_storeu_si128(reinterpret_cast<__m128i *>(dst + i), data1);
++ _mm_storeu_si128(reinterpret_cast<__m128i *>(dst + i) + 1, data2);
++ }
++ # endif
++
++ if (i + sizeof(__m128i) <= bytes) {
++ __m128i data = _mm_loadu_si128(reinterpret_cast<const __m128i *>(src + i));
++ data = _mm_shuffle_epi8(data, shuffleMask);
++ _mm_storeu_si128(reinterpret_cast<__m128i *>(dst + i), data);
++ i += sizeof(__m128i);
++ }
++
++ return i;
++ }
++
++ template <typename T> static Q_ALWAYS_INLINE
++ size_t simdSwapLoop(const uchar *src, size_t bytes, uchar *dst) noexcept
++ {
++ auto shuffleMaskPtr = reinterpret_cast<const __m128i *>(shuffleMasks[0]);
++ shuffleMaskPtr += qCountTrailingZeroBits(sizeof(T)) - 1;
++ size_t i = sseSwapLoop(src, bytes, dst, shuffleMaskPtr);
++
++ // epilogue
++ for (size_t _i = 0; i < bytes && _i < sizeof(__m128i); i += sizeof(T), _i += sizeof(T))
++ qbswap(qFromUnaligned<T>(src + i), dst + i);
++
++ // return the total, so the bswapLoop below does nothing
++ return bytes;
++ }
++ #elif defined(__SSE2__)
++ template <typename T> static
++ size_t simdSwapLoop(const uchar *, size_t, uchar *) noexcept
++ {
++ // no generic version: we can't do 32- and 64-bit swaps easily,
++ // so we won't try
++ return 0;
++ }
++
++ template <> size_t simdSwapLoop<quint16>(const uchar *src, size_t bytes, uchar *dst) noexcept
++ {
++ auto swapEndian = [](__m128i &data) {
++ __m128i lows = _mm_srli_epi16(data, 8);
++ __m128i highs = _mm_slli_epi16(data, 8);
++ data = _mm_xor_si128(lows, highs);
++ };
++
++ size_t i = 0;
++ for ( ; i + 2 * sizeof(__m128i) <= bytes; i += 2 * sizeof(__m128i)) {
++ __m128i data1 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(src + i));
++ __m128i data2 = _mm_loadu_si128(reinterpret_cast<const __m128i *>(src + i) + 1);
++ swapEndian(data1);
++ swapEndian(data2);
++ _mm_storeu_si128(reinterpret_cast<__m128i *>(dst + i), data1);
++ _mm_storeu_si128(reinterpret_cast<__m128i *>(dst + i) + 1, data2);
++ }
++
++ if (i + sizeof(__m128i) <= bytes) {
++ __m128i data = _mm_loadu_si128(reinterpret_cast<const __m128i *>(src + i));
++ swapEndian(data);
++ _mm_storeu_si128(reinterpret_cast<__m128i *>(dst + i), data);
++ i += sizeof(__m128i);
++ }
++
++ // epilogue
++ for (size_t _i = 0 ; i < bytes && _i < sizeof(__m128i); i += sizeof(quint16), _i += sizeof(quint16))
++ qbswap(qFromUnaligned<quint16>(src + i), dst + i);
++
++ // return the total, so the bswapLoop below does nothing
++ return bytes;
++ }
++ #else
++ template <typename T> static Q_ALWAYS_INLINE
++ size_t simdSwapLoop(const uchar *, size_t, uchar *) noexcept
++ {
++ return 0;
++ }
++ #endif
++
++ template <typename T> Q_ALWAYS_INLINE static
++ void *bswapLoop(const uchar *src, size_t n, uchar *dst) noexcept
++ {
++ // Buffers cannot partially overlap: either they're identical or totally
++ // disjoint (note: they can be adjacent).
++ if (src != dst) {
++ quintptr s = quintptr(src);
++ quintptr d = quintptr(dst);
++ if (s < d)
++ Q_ASSERT(s + n <= d);
++ else
++ Q_ASSERT(d + n <= s);
++ }
++
++ size_t i = simdSwapLoop<T>(src, n, dst);
++
++ for (; i < n; i += sizeof(T))
++ qbswap(qFromUnaligned<T>(src + i), dst + i);
++ return dst + i;
++ }
++
++ template<>
++ void *qbswap<2>(const void *source, qsizetype n, void *dest) noexcept
++ {
++ const uchar *src = reinterpret_cast<const uchar *>(source);
++ uchar *dst = reinterpret_cast<uchar *>(dest);
++
++ return bswapLoop<quint16>(src, n << 1, dst);
++ }
++
++ template<>
++ void *qbswap<4>(const void *source, qsizetype n, void *dest) noexcept
++ {
++ const uchar *src = reinterpret_cast<const uchar *>(source);
++ uchar *dst = reinterpret_cast<uchar *>(dest);
++
++ return bswapLoop<quint32>(src, n << 2, dst);
++ }
++
++ template<>
++ void *qbswap<8>(const void *source, qsizetype n, void *dest) noexcept
++ {
++ const uchar *src = reinterpret_cast<const uchar *>(source);
++ uchar *dst = reinterpret_cast<uchar *>(dest);
++
++ return bswapLoop<quint64>(src, n << 3, dst);
++ }
++
++ QT_END_NAMESPACE