bit_pack-inl.h - mozsearch

// Copyright 2022 Google LLC

// SPDX-License-Identifier: Apache-2.0

//

// 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

//

//      http://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.

// Per-target include guard

#if defined(HIGHWAY_HWY_CONTRIB_BIT_PACK_INL_H_) == defined(HWY_TARGET_TOGGLE)

#ifdef HIGHWAY_HWY_CONTRIB_BIT_PACK_INL_H_

#undef HIGHWAY_HWY_CONTRIB_BIT_PACK_INL_H_

#else

#define HIGHWAY_HWY_CONTRIB_BIT_PACK_INL_H_

#endif

#include "hwy/highway.h"

HWY_BEFORE_NAMESPACE();

namespace hwy {

namespace HWY_NAMESPACE {

// The entry points are class templates specialized below for each number of

// bits. Each provides Pack and Unpack member functions which load (Pack) or

// store (Unpack) B raw vectors, and store (Pack) or load (Unpack) a number of

// packed vectors equal to kBits. B denotes the bits per lane: 8 for Pack8, 16

// for Pack16, which is also the upper bound for kBits.

template <size_t kBits>  // <= 8

struct Pack8 {};

template <size_t kBits>  // <= 16

struct Pack16 {};

template <>

struct Pack8<1> {

  template <class D8>

  HWY_INLINE void Pack(D8 d8, const uint8_t* HWY_RESTRICT raw,

                       uint8_t* HWY_RESTRICT packed_out) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    // 16-bit shifts avoid masking (bits will not cross 8-bit lanes).

    const VU16 raw0 = BitCast(d16, LoadU(d8, raw + 0 * N8));

    const VU16 raw1 = BitCast(d16, LoadU(d8, raw + 1 * N8));

    const VU16 raw2 = BitCast(d16, LoadU(d8, raw + 2 * N8));

    const VU16 raw3 = BitCast(d16, LoadU(d8, raw + 3 * N8));

    const VU16 raw4 = BitCast(d16, LoadU(d8, raw + 4 * N8));

    const VU16 raw5 = BitCast(d16, LoadU(d8, raw + 5 * N8));

    const VU16 raw6 = BitCast(d16, LoadU(d8, raw + 6 * N8));

    const VU16 raw7 = BitCast(d16, LoadU(d8, raw + 7 * N8));

    const VU16 packed =

        Xor3(Or(ShiftLeft<7>(raw7), ShiftLeft<6>(raw6)),

             Xor3(ShiftLeft<5>(raw5), ShiftLeft<4>(raw4), ShiftLeft<3>(raw3)),

             Xor3(ShiftLeft<2>(raw2), ShiftLeft<1>(raw1), raw0));

    StoreU(BitCast(d8, packed), d8, packed_out);

  template <class D8>

  HWY_INLINE void Unpack(D8 d8, const uint8_t* HWY_RESTRICT packed_in,

                         uint8_t* HWY_RESTRICT raw) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 mask = Set(d16, 0x0101u);  // LSB in each byte

    const VU16 packed = BitCast(d16, LoadU(d8, packed_in));

    const VU16 raw0 = And(packed, mask);

    StoreU(BitCast(d8, raw0), d8, raw + 0 * N8);

    const VU16 raw1 = And(ShiftRight<1>(packed), mask);

    StoreU(BitCast(d8, raw1), d8, raw + 1 * N8);

    const VU16 raw2 = And(ShiftRight<2>(packed), mask);

    StoreU(BitCast(d8, raw2), d8, raw + 2 * N8);

    const VU16 raw3 = And(ShiftRight<3>(packed), mask);

    StoreU(BitCast(d8, raw3), d8, raw + 3 * N8);

    const VU16 raw4 = And(ShiftRight<4>(packed), mask);

    StoreU(BitCast(d8, raw4), d8, raw + 4 * N8);

    const VU16 raw5 = And(ShiftRight<5>(packed), mask);

    StoreU(BitCast(d8, raw5), d8, raw + 5 * N8);

    const VU16 raw6 = And(ShiftRight<6>(packed), mask);

    StoreU(BitCast(d8, raw6), d8, raw + 6 * N8);

    const VU16 raw7 = And(ShiftRight<7>(packed), mask);

    StoreU(BitCast(d8, raw7), d8, raw + 7 * N8);

};  // Pack8<1>

template <>

struct Pack8<2> {

  template <class D8>

  HWY_INLINE void Pack(D8 d8, const uint8_t* HWY_RESTRICT raw,

                       uint8_t* HWY_RESTRICT packed_out) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    // 16-bit shifts avoid masking (bits will not cross 8-bit lanes).

    const VU16 raw0 = BitCast(d16, LoadU(d8, raw + 0 * N8));

    const VU16 raw1 = BitCast(d16, LoadU(d8, raw + 1 * N8));

    const VU16 raw2 = BitCast(d16, LoadU(d8, raw + 2 * N8));

    const VU16 raw3 = BitCast(d16, LoadU(d8, raw + 3 * N8));

    const VU16 raw4 = BitCast(d16, LoadU(d8, raw + 4 * N8));

    const VU16 raw5 = BitCast(d16, LoadU(d8, raw + 5 * N8));

    const VU16 raw6 = BitCast(d16, LoadU(d8, raw + 6 * N8));

    const VU16 raw7 = BitCast(d16, LoadU(d8, raw + 7 * N8));

    const VU16 packed0 = Xor3(ShiftLeft<6>(raw6), ShiftLeft<4>(raw4),

                              Or(ShiftLeft<2>(raw2), raw0));

    const VU16 packed1 = Xor3(ShiftLeft<6>(raw7), ShiftLeft<4>(raw5),

                              Or(ShiftLeft<2>(raw3), raw1));

    StoreU(BitCast(d8, packed0), d8, packed_out + 0 * N8);

    StoreU(BitCast(d8, packed1), d8, packed_out + 1 * N8);

  template <class D8>

  HWY_INLINE void Unpack(D8 d8, const uint8_t* HWY_RESTRICT packed_in,

                         uint8_t* HWY_RESTRICT raw) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 mask = Set(d16, 0x0303u);  // Lowest 2 bits per byte

    const VU16 packed0 = BitCast(d16, LoadU(d8, packed_in + 0 * N8));

    const VU16 packed1 = BitCast(d16, LoadU(d8, packed_in + 1 * N8));

    const VU16 raw0 = And(packed0, mask);

    StoreU(BitCast(d8, raw0), d8, raw + 0 * N8);

    const VU16 raw1 = And(packed1, mask);

    StoreU(BitCast(d8, raw1), d8, raw + 1 * N8);

    const VU16 raw2 = And(ShiftRight<2>(packed0), mask);

    StoreU(BitCast(d8, raw2), d8, raw + 2 * N8);

    const VU16 raw3 = And(ShiftRight<2>(packed1), mask);

    StoreU(BitCast(d8, raw3), d8, raw + 3 * N8);

    const VU16 raw4 = And(ShiftRight<4>(packed0), mask);

    StoreU(BitCast(d8, raw4), d8, raw + 4 * N8);

    const VU16 raw5 = And(ShiftRight<4>(packed1), mask);

    StoreU(BitCast(d8, raw5), d8, raw + 5 * N8);

    const VU16 raw6 = And(ShiftRight<6>(packed0), mask);

    StoreU(BitCast(d8, raw6), d8, raw + 6 * N8);

    const VU16 raw7 = And(ShiftRight<6>(packed1), mask);

    StoreU(BitCast(d8, raw7), d8, raw + 7 * N8);

};  // Pack8<2>

template <>

struct Pack8<3> {

  template <class D8>

  HWY_INLINE void Pack(D8 d8, const uint8_t* HWY_RESTRICT raw,

                       uint8_t* HWY_RESTRICT packed_out) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 raw0 = BitCast(d16, LoadU(d8, raw + 0 * N8));

    const VU16 raw1 = BitCast(d16, LoadU(d8, raw + 1 * N8));

    const VU16 raw2 = BitCast(d16, LoadU(d8, raw + 2 * N8));

    const VU16 raw3 = BitCast(d16, LoadU(d8, raw + 3 * N8));

    const VU16 raw4 = BitCast(d16, LoadU(d8, raw + 4 * N8));

    const VU16 raw5 = BitCast(d16, LoadU(d8, raw + 5 * N8));

    const VU16 raw6 = BitCast(d16, LoadU(d8, raw + 6 * N8));

    const VU16 raw7 = BitCast(d16, LoadU(d8, raw + 7 * N8));

    // The upper two bits of these three will be filled with packed3 (6 bits).

    VU16 packed0 = Or(ShiftLeft<3>(raw4), raw0);

    VU16 packed1 = Or(ShiftLeft<3>(raw5), raw1);

    VU16 packed2 = Or(ShiftLeft<3>(raw6), raw2);

    const VU16 packed3 = Or(ShiftLeft<3>(raw7), raw3);

    const VU16 hi2 = Set(d16, 0xC0C0u);

    packed0 = OrAnd(packed0, ShiftLeft<2>(packed3), hi2);

    packed1 = OrAnd(packed1, ShiftLeft<4>(packed3), hi2);

    packed2 = OrAnd(packed2, ShiftLeft<6>(packed3), hi2);

    StoreU(BitCast(d8, packed0), d8, packed_out + 0 * N8);

    StoreU(BitCast(d8, packed1), d8, packed_out + 1 * N8);

    StoreU(BitCast(d8, packed2), d8, packed_out + 2 * N8);

  template <class D8>

  HWY_INLINE void Unpack(D8 d8, const uint8_t* HWY_RESTRICT packed_in,

                         uint8_t* HWY_RESTRICT raw) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 mask = Set(d16, 0x0707u);  // Lowest 3 bits per byte

    const VU16 packed0 = BitCast(d16, LoadU(d8, packed_in + 0 * N8));

    const VU16 packed1 = BitCast(d16, LoadU(d8, packed_in + 1 * N8));

    const VU16 packed2 = BitCast(d16, LoadU(d8, packed_in + 2 * N8));

    const VU16 raw0 = And(packed0, mask);

    StoreU(BitCast(d8, raw0), d8, raw + 0 * N8);

    const VU16 raw1 = And(packed1, mask);

    StoreU(BitCast(d8, raw1), d8, raw + 1 * N8);

    const VU16 raw2 = And(packed2, mask);

    StoreU(BitCast(d8, raw2), d8, raw + 2 * N8);

    const VU16 raw4 = And(ShiftRight<3>(packed0), mask);

    StoreU(BitCast(d8, raw4), d8, raw + 4 * N8);

    const VU16 raw5 = And(ShiftRight<3>(packed1), mask);

    StoreU(BitCast(d8, raw5), d8, raw + 5 * N8);

    const VU16 raw6 = And(ShiftRight<3>(packed2), mask);

    StoreU(BitCast(d8, raw6), d8, raw + 6 * N8);

    // raw73 is the concatenation of the upper two bits in packed0..2.

    const VU16 hi2 = Set(d16, 0xC0C0u);

    const VU16 raw73 = Xor3(ShiftRight<6>(And(packed2, hi2)),  //

                            ShiftRight<4>(And(packed1, hi2)),

                            ShiftRight<2>(And(packed0, hi2)));

    const VU16 raw3 = And(mask, raw73);

    StoreU(BitCast(d8, raw3), d8, raw + 3 * N8);

    const VU16 raw7 = And(mask, ShiftRight<3>(raw73));

    StoreU(BitCast(d8, raw7), d8, raw + 7 * N8);

};  // Pack8<3>

template <>

struct Pack8<4> {

  template <class D8>

  HWY_INLINE void Pack(D8 d8, const uint8_t* HWY_RESTRICT raw,

                       uint8_t* HWY_RESTRICT packed_out) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    // 16-bit shifts avoid masking (bits will not cross 8-bit lanes).

    const VU16 raw0 = BitCast(d16, LoadU(d8, raw + 0 * N8));

    const VU16 raw1 = BitCast(d16, LoadU(d8, raw + 1 * N8));

    const VU16 raw2 = BitCast(d16, LoadU(d8, raw + 2 * N8));

    const VU16 raw3 = BitCast(d16, LoadU(d8, raw + 3 * N8));

    const VU16 raw4 = BitCast(d16, LoadU(d8, raw + 4 * N8));

    const VU16 raw5 = BitCast(d16, LoadU(d8, raw + 5 * N8));

    const VU16 raw6 = BitCast(d16, LoadU(d8, raw + 6 * N8));

    const VU16 raw7 = BitCast(d16, LoadU(d8, raw + 7 * N8));

    const VU16 packed0 = Or(ShiftLeft<4>(raw2), raw0);

    const VU16 packed1 = Or(ShiftLeft<4>(raw3), raw1);

    const VU16 packed2 = Or(ShiftLeft<4>(raw6), raw4);

    const VU16 packed3 = Or(ShiftLeft<4>(raw7), raw5);

    StoreU(BitCast(d8, packed0), d8, packed_out + 0 * N8);

    StoreU(BitCast(d8, packed1), d8, packed_out + 1 * N8);

    StoreU(BitCast(d8, packed2), d8, packed_out + 2 * N8);

    StoreU(BitCast(d8, packed3), d8, packed_out + 3 * N8);

  template <class D8>

  HWY_INLINE void Unpack(D8 d8, const uint8_t* HWY_RESTRICT packed_in,

                         uint8_t* HWY_RESTRICT raw) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 mask = Set(d16, 0x0F0Fu);  // Lowest 4 bits per byte

    const VU16 packed0 = BitCast(d16, LoadU(d8, packed_in + 0 * N8));

    const VU16 packed1 = BitCast(d16, LoadU(d8, packed_in + 1 * N8));

    const VU16 packed2 = BitCast(d16, LoadU(d8, packed_in + 2 * N8));

    const VU16 packed3 = BitCast(d16, LoadU(d8, packed_in + 3 * N8));

    const VU16 raw0 = And(packed0, mask);

    StoreU(BitCast(d8, raw0), d8, raw + 0 * N8);

    const VU16 raw1 = And(packed1, mask);

    StoreU(BitCast(d8, raw1), d8, raw + 1 * N8);

    const VU16 raw2 = And(ShiftRight<4>(packed0), mask);

    StoreU(BitCast(d8, raw2), d8, raw + 2 * N8);

    const VU16 raw3 = And(ShiftRight<4>(packed1), mask);

    StoreU(BitCast(d8, raw3), d8, raw + 3 * N8);

    const VU16 raw4 = And(packed2, mask);

    StoreU(BitCast(d8, raw4), d8, raw + 4 * N8);

    const VU16 raw5 = And(packed3, mask);

    StoreU(BitCast(d8, raw5), d8, raw + 5 * N8);

    const VU16 raw6 = And(ShiftRight<4>(packed2), mask);

    StoreU(BitCast(d8, raw6), d8, raw + 6 * N8);

    const VU16 raw7 = And(ShiftRight<4>(packed3), mask);

    StoreU(BitCast(d8, raw7), d8, raw + 7 * N8);

};  // Pack8<4>

template <>

struct Pack8<5> {

  template <class D8>

  HWY_INLINE void Pack(D8 d8, const uint8_t* HWY_RESTRICT raw,

                       uint8_t* HWY_RESTRICT packed_out) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 raw0 = BitCast(d16, LoadU(d8, raw + 0 * N8));

    const VU16 raw1 = BitCast(d16, LoadU(d8, raw + 1 * N8));

    const VU16 raw2 = BitCast(d16, LoadU(d8, raw + 2 * N8));

    const VU16 raw3 = BitCast(d16, LoadU(d8, raw + 3 * N8));

    const VU16 raw4 = BitCast(d16, LoadU(d8, raw + 4 * N8));

    const VU16 raw5 = BitCast(d16, LoadU(d8, raw + 5 * N8));

    const VU16 raw6 = BitCast(d16, LoadU(d8, raw + 6 * N8));

    const VU16 raw7 = BitCast(d16, LoadU(d8, raw + 7 * N8));

    // Fill upper three bits with upper bits from raw4..7.

    const VU16 hi3 = Set(d16, 0xE0E0u);

    const VU16 packed0 = OrAnd(raw0, ShiftLeft<3>(raw4), hi3);

    const VU16 packed1 = OrAnd(raw1, ShiftLeft<3>(raw5), hi3);

    const VU16 packed2 = OrAnd(raw2, ShiftLeft<3>(raw6), hi3);

    const VU16 packed3 = OrAnd(raw3, ShiftLeft<3>(raw7), hi3);

    StoreU(BitCast(d8, packed0), d8, packed_out + 0 * N8);

    StoreU(BitCast(d8, packed1), d8, packed_out + 1 * N8);

    StoreU(BitCast(d8, packed2), d8, packed_out + 2 * N8);

    StoreU(BitCast(d8, packed3), d8, packed_out + 3 * N8);

    // Combine lower two bits of raw4..7 into packed4.

    const VU16 lo2 = Set(d16, 0x0303u);

    const VU16 packed4 = Or(And(raw4, lo2), Xor3(ShiftLeft<2>(And(raw5, lo2)),

                                                 ShiftLeft<4>(And(raw6, lo2)),

                                                 ShiftLeft<6>(And(raw7, lo2))));

    StoreU(BitCast(d8, packed4), d8, packed_out + 4 * N8);

  template <class D8>

  HWY_INLINE void Unpack(D8 d8, const uint8_t* HWY_RESTRICT packed_in,

                         uint8_t* HWY_RESTRICT raw) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 packed0 = BitCast(d16, LoadU(d8, packed_in + 0 * N8));

    const VU16 packed1 = BitCast(d16, LoadU(d8, packed_in + 1 * N8));

    const VU16 packed2 = BitCast(d16, LoadU(d8, packed_in + 2 * N8));

    const VU16 packed3 = BitCast(d16, LoadU(d8, packed_in + 3 * N8));

    const VU16 packed4 = BitCast(d16, LoadU(d8, packed_in + 4 * N8));

    const VU16 mask = Set(d16, 0x1F1Fu);  // Lowest 5 bits per byte

    const VU16 raw0 = And(packed0, mask);

    StoreU(BitCast(d8, raw0), d8, raw + 0 * N8);

    const VU16 raw1 = And(packed1, mask);

    StoreU(BitCast(d8, raw1), d8, raw + 1 * N8);

    const VU16 raw2 = And(packed2, mask);

    StoreU(BitCast(d8, raw2), d8, raw + 2 * N8);

    const VU16 raw3 = And(packed3, mask);

    StoreU(BitCast(d8, raw3), d8, raw + 3 * N8);

    // The upper bits are the top 3 bits shifted right by three.

    const VU16 top4 = ShiftRight<3>(AndNot(mask, packed0));

    const VU16 top5 = ShiftRight<3>(AndNot(mask, packed1));

    const VU16 top6 = ShiftRight<3>(AndNot(mask, packed2));

    const VU16 top7 = ShiftRight<3>(AndNot(mask, packed3));

    // Insert the lower 2 bits, which were concatenated into a byte.

    const VU16 lo2 = Set(d16, 0x0303u);

    const VU16 raw4 = OrAnd(top4, lo2, packed4);

    const VU16 raw5 = OrAnd(top5, lo2, ShiftRight<2>(packed4));

    const VU16 raw6 = OrAnd(top6, lo2, ShiftRight<4>(packed4));

    const VU16 raw7 = OrAnd(top7, lo2, ShiftRight<6>(packed4));

    StoreU(BitCast(d8, raw4), d8, raw + 4 * N8);

    StoreU(BitCast(d8, raw5), d8, raw + 5 * N8);

    StoreU(BitCast(d8, raw6), d8, raw + 6 * N8);

    StoreU(BitCast(d8, raw7), d8, raw + 7 * N8);

};  // Pack8<5>

template <>

struct Pack8<6> {

  template <class D8>

  HWY_INLINE void Pack(D8 d8, const uint8_t* HWY_RESTRICT raw,

                       uint8_t* HWY_RESTRICT packed_out) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 raw0 = BitCast(d16, LoadU(d8, raw + 0 * N8));

    const VU16 raw1 = BitCast(d16, LoadU(d8, raw + 1 * N8));

    const VU16 raw2 = BitCast(d16, LoadU(d8, raw + 2 * N8));

    const VU16 raw3 = BitCast(d16, LoadU(d8, raw + 3 * N8));

    const VU16 raw4 = BitCast(d16, LoadU(d8, raw + 4 * N8));

    const VU16 raw5 = BitCast(d16, LoadU(d8, raw + 5 * N8));

    const VU16 raw6 = BitCast(d16, LoadU(d8, raw + 6 * N8));

    const VU16 raw7 = BitCast(d16, LoadU(d8, raw + 7 * N8));

    const VU16 hi2 = Set(d16, 0xC0C0u);

    // Each triplet of these stores raw3/raw7 (6 bits) in the upper 2 bits.

    const VU16 packed0 = OrAnd(raw0, ShiftLeft<2>(raw3), hi2);

    const VU16 packed1 = OrAnd(raw1, ShiftLeft<4>(raw3), hi2);

    const VU16 packed2 = OrAnd(raw2, ShiftLeft<6>(raw3), hi2);

    const VU16 packed3 = OrAnd(raw4, ShiftLeft<2>(raw7), hi2);

    const VU16 packed4 = OrAnd(raw5, ShiftLeft<4>(raw7), hi2);

    const VU16 packed5 = OrAnd(raw6, ShiftLeft<6>(raw7), hi2);

    StoreU(BitCast(d8, packed0), d8, packed_out + 0 * N8);

    StoreU(BitCast(d8, packed1), d8, packed_out + 1 * N8);

    StoreU(BitCast(d8, packed2), d8, packed_out + 2 * N8);

    StoreU(BitCast(d8, packed3), d8, packed_out + 3 * N8);

    StoreU(BitCast(d8, packed4), d8, packed_out + 4 * N8);

    StoreU(BitCast(d8, packed5), d8, packed_out + 5 * N8);

  template <class D8>

  HWY_INLINE void Unpack(D8 d8, const uint8_t* HWY_RESTRICT packed_in,

                         uint8_t* HWY_RESTRICT raw) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 mask = Set(d16, 0x3F3Fu);  // Lowest 6 bits per byte

    const VU16 packed0 = BitCast(d16, LoadU(d8, packed_in + 0 * N8));

    const VU16 packed1 = BitCast(d16, LoadU(d8, packed_in + 1 * N8));

    const VU16 packed2 = BitCast(d16, LoadU(d8, packed_in + 2 * N8));

    const VU16 packed3 = BitCast(d16, LoadU(d8, packed_in + 3 * N8));

    const VU16 packed4 = BitCast(d16, LoadU(d8, packed_in + 4 * N8));

    const VU16 packed5 = BitCast(d16, LoadU(d8, packed_in + 5 * N8));

    const VU16 raw0 = And(packed0, mask);

    StoreU(BitCast(d8, raw0), d8, raw + 0 * N8);

    const VU16 raw1 = And(packed1, mask);

    StoreU(BitCast(d8, raw1), d8, raw + 1 * N8);

    const VU16 raw2 = And(packed2, mask);

    StoreU(BitCast(d8, raw2), d8, raw + 2 * N8);

    const VU16 raw4 = And(packed3, mask);

    StoreU(BitCast(d8, raw4), d8, raw + 4 * N8);

    const VU16 raw5 = And(packed4, mask);

    StoreU(BitCast(d8, raw5), d8, raw + 5 * N8);

    const VU16 raw6 = And(packed5, mask);

    StoreU(BitCast(d8, raw6), d8, raw + 6 * N8);

    // raw3/7 are the concatenation of the upper two bits in packed0..2.

    const VU16 raw3 = Xor3(ShiftRight<6>(AndNot(mask, packed2)),

                           ShiftRight<4>(AndNot(mask, packed1)),

                           ShiftRight<2>(AndNot(mask, packed0)));

    const VU16 raw7 = Xor3(ShiftRight<6>(AndNot(mask, packed5)),

                           ShiftRight<4>(AndNot(mask, packed4)),

                           ShiftRight<2>(AndNot(mask, packed3)));

    StoreU(BitCast(d8, raw3), d8, raw + 3 * N8);

    StoreU(BitCast(d8, raw7), d8, raw + 7 * N8);

};  // Pack8<6>

template <>

struct Pack8<7> {

  template <class D8>

  HWY_INLINE void Pack(D8 d8, const uint8_t* HWY_RESTRICT raw,

                       uint8_t* HWY_RESTRICT packed_out) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 raw0 = BitCast(d16, LoadU(d8, raw + 0 * N8));

    const VU16 raw1 = BitCast(d16, LoadU(d8, raw + 1 * N8));

    const VU16 raw2 = BitCast(d16, LoadU(d8, raw + 2 * N8));

    const VU16 raw3 = BitCast(d16, LoadU(d8, raw + 3 * N8));

    const VU16 raw4 = BitCast(d16, LoadU(d8, raw + 4 * N8));

    const VU16 raw5 = BitCast(d16, LoadU(d8, raw + 5 * N8));

    const VU16 raw6 = BitCast(d16, LoadU(d8, raw + 6 * N8));

    // Inserted into top bit of packed0..6.

    const VU16 raw7 = BitCast(d16, LoadU(d8, raw + 7 * N8));

    const VU16 hi1 = Set(d16, 0x8080u);

    const VU16 packed0 = OrAnd(raw0, Add(raw7, raw7), hi1);

    const VU16 packed1 = OrAnd(raw1, ShiftLeft<2>(raw7), hi1);

    const VU16 packed2 = OrAnd(raw2, ShiftLeft<3>(raw7), hi1);

    const VU16 packed3 = OrAnd(raw3, ShiftLeft<4>(raw7), hi1);

    const VU16 packed4 = OrAnd(raw4, ShiftLeft<5>(raw7), hi1);

    const VU16 packed5 = OrAnd(raw5, ShiftLeft<6>(raw7), hi1);

    const VU16 packed6 = OrAnd(raw6, ShiftLeft<7>(raw7), hi1);

    StoreU(BitCast(d8, packed0), d8, packed_out + 0 * N8);

    StoreU(BitCast(d8, packed1), d8, packed_out + 1 * N8);

    StoreU(BitCast(d8, packed2), d8, packed_out + 2 * N8);

    StoreU(BitCast(d8, packed3), d8, packed_out + 3 * N8);

    StoreU(BitCast(d8, packed4), d8, packed_out + 4 * N8);

    StoreU(BitCast(d8, packed5), d8, packed_out + 5 * N8);

    StoreU(BitCast(d8, packed6), d8, packed_out + 6 * N8);

  template <class D8>

  HWY_INLINE void Unpack(D8 d8, const uint8_t* HWY_RESTRICT packed_in,

                         uint8_t* HWY_RESTRICT raw) const {

    const RepartitionToWide<decltype(d8)> d16;

    using VU16 = Vec<decltype(d16)>;

    const size_t N8 = Lanes(d8);

    const VU16 packed0 = BitCast(d16, LoadU(d8, packed_in + 0 * N8));

    const VU16 packed1 = BitCast(d16, LoadU(d8, packed_in + 1 * N8));

    const VU16 packed2 = BitCast(d16, LoadU(d8, packed_in + 2 * N8));

    const VU16 packed3 = BitCast(d16, LoadU(d8, packed_in + 3 * N8));

    const VU16 packed4 = BitCast(d16, LoadU(d8, packed_in + 4 * N8));

    const VU16 packed5 = BitCast(d16, LoadU(d8, packed_in + 5 * N8));

    const VU16 packed6 = BitCast(d16, LoadU(d8, packed_in + 6 * N8));

    const VU16 mask = Set(d16, 0x7F7Fu);  // Lowest 7 bits per byte

    const VU16 raw0 = And(packed0, mask);

    StoreU(BitCast(d8, raw0), d8, raw + 0 * N8);

    const VU16 raw1 = And(packed1, mask);

    StoreU(BitCast(d8, raw1), d8, raw + 1 * N8);

    const VU16 raw2 = And(packed2, mask);

    StoreU(BitCast(d8, raw2), d8, raw + 2 * N8);

    const VU16 raw3 = And(packed3, mask);

    StoreU(BitCast(d8, raw3), d8, raw + 3 * N8);

    const VU16 raw4 = And(packed4, mask);

    StoreU(BitCast(d8, raw4), d8, raw + 4 * N8);

    const VU16 raw5 = And(packed5, mask);

    StoreU(BitCast(d8, raw5), d8, raw + 5 * N8);

    const VU16 raw6 = And(packed6, mask);

    StoreU(BitCast(d8, raw6), d8, raw + 6 * N8);

    const VU16 p0 = Xor3(ShiftRight<7>(AndNot(mask, packed6)),

                         ShiftRight<6>(AndNot(mask, packed5)),

                         ShiftRight<5>(AndNot(mask, packed4)));

    const VU16 p1 = Xor3(ShiftRight<4>(AndNot(mask, packed3)),

                         ShiftRight<3>(AndNot(mask, packed2)),

                         ShiftRight<2>(AndNot(mask, packed1)));

    const VU16 raw7 = Xor3(ShiftRight<1>(AndNot(mask, packed0)), p0, p1);

    StoreU(BitCast(d8, raw7), d8, raw + 7 * N8);

};  // Pack8<7>

template <>

struct Pack8<8> {

  template <class D8>

  HWY_INLINE void Pack(D8 d8, const uint8_t* HWY_RESTRICT raw,

                       uint8_t* HWY_RESTRICT packed_out) const {

    using VU8 = Vec<decltype(d8)>;

    const size_t N8 = Lanes(d8);

    const VU8 raw0 = LoadU(d8, raw + 0 * N8);

    const VU8 raw1 = LoadU(d8, raw + 1 * N8);

    const VU8 raw2 = LoadU(d8, raw + 2 * N8);

    const VU8 raw3 = LoadU(d8, raw + 3 * N8);

    const VU8 raw4 = LoadU(d8, raw + 4 * N8);

    const VU8 raw5 = LoadU(d8, raw + 5 * N8);

    const VU8 raw6 = LoadU(d8, raw + 6 * N8);

    const VU8 raw7 = LoadU(d8, raw + 7 * N8);

    StoreU(raw0, d8, packed_out + 0 * N8);

    StoreU(raw1, d8, packed_out + 1 * N8);

    StoreU(raw2, d8, packed_out + 2 * N8);

    StoreU(raw3, d8, packed_out + 3 * N8);

    StoreU(raw4, d8, packed_out + 4 * N8);

    StoreU(raw5, d8, packed_out + 5 * N8);

    StoreU(raw6, d8, packed_out + 6 * N8);

    StoreU(raw7, d8, packed_out + 7 * N8);

  template <class D8>

  HWY_INLINE void Unpack(D8 d8, const uint8_t* HWY_RESTRICT packed_in,

                         uint8_t* HWY_RESTRICT raw) const {

    using VU8 = Vec<decltype(d8)>;

    const size_t N8 = Lanes(d8);

    const VU8 raw0 = LoadU(d8, packed_in + 0 * N8);

    const VU8 raw1 = LoadU(d8, packed_in + 1 * N8);

    const VU8 raw2 = LoadU(d8, packed_in + 2 * N8);

    const VU8 raw3 = LoadU(d8, packed_in + 3 * N8);

    const VU8 raw4 = LoadU(d8, packed_in + 4 * N8);

    const VU8 raw5 = LoadU(d8, packed_in + 5 * N8);

    const VU8 raw6 = LoadU(d8, packed_in + 6 * N8);

    const VU8 raw7 = LoadU(d8, packed_in + 7 * N8);

    StoreU(raw0, d8, raw + 0 * N8);

    StoreU(raw1, d8, raw + 1 * N8);

    StoreU(raw2, d8, raw + 2 * N8);

    StoreU(raw3, d8, raw + 3 * N8);

    StoreU(raw4, d8, raw + 4 * N8);

    StoreU(raw5, d8, raw + 5 * N8);

    StoreU(raw6, d8, raw + 6 * N8);

    StoreU(raw7, d8, raw + 7 * N8);

};  // Pack8<8>

template <>

struct Pack16<1> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    const VU16 p0 = Xor3(ShiftLeft<2>(raw2), Add(raw1, raw1), raw0);

    const VU16 p1 =

        Xor3(ShiftLeft<5>(raw5), ShiftLeft<4>(raw4), ShiftLeft<3>(raw3));

    const VU16 p2 =

        Xor3(ShiftLeft<8>(raw8), ShiftLeft<7>(raw7), ShiftLeft<6>(raw6));

    const VU16 p3 =

        Xor3(ShiftLeft<0xB>(rawB), ShiftLeft<0xA>(rawA), ShiftLeft<9>(raw9));

    const VU16 p4 =

        Xor3(ShiftLeft<0xE>(rawE), ShiftLeft<0xD>(rawD), ShiftLeft<0xC>(rawC));

    const VU16 packed =

        Or(Xor3(ShiftLeft<0xF>(rawF), p0, p1), Xor3(p2, p3, p4));

    StoreU(packed, d, packed_out);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 mask = Set(d, 1u);  // Lowest bit

    const VU16 packed = LoadU(d, packed_in);

    const VU16 raw0 = And(packed, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(ShiftRight<1>(packed), mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(ShiftRight<2>(packed), mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(ShiftRight<3>(packed), mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(ShiftRight<4>(packed), mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(ShiftRight<5>(packed), mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(ShiftRight<6>(packed), mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = And(ShiftRight<7>(packed), mask);

    StoreU(raw7, d, raw + 7 * N);

    const VU16 raw8 = And(ShiftRight<8>(packed), mask);

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(ShiftRight<9>(packed), mask);

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = And(ShiftRight<0xA>(packed), mask);

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawB = And(ShiftRight<0xB>(packed), mask);

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 rawC = And(ShiftRight<0xC>(packed), mask);

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(ShiftRight<0xD>(packed), mask);

    StoreU(rawD, d, raw + 0xD * N);

    const VU16 rawE = And(ShiftRight<0xE>(packed), mask);

    StoreU(rawE, d, raw + 0xE * N);

    const VU16 rawF = ShiftRight<0xF>(packed);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<1>

template <>

struct Pack16<2> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    VU16 packed0 = Xor3(ShiftLeft<4>(raw4), ShiftLeft<2>(raw2), raw0);

    VU16 packed1 = Xor3(ShiftLeft<4>(raw5), ShiftLeft<2>(raw3), raw1);

    packed0 = Xor3(packed0, ShiftLeft<8>(raw8), ShiftLeft<6>(raw6));

    packed1 = Xor3(packed1, ShiftLeft<8>(raw9), ShiftLeft<6>(raw7));

    packed0 = Xor3(packed0, ShiftLeft<12>(rawC), ShiftLeft<10>(rawA));

    packed1 = Xor3(packed1, ShiftLeft<12>(rawD), ShiftLeft<10>(rawB));

    packed0 = Or(packed0, ShiftLeft<14>(rawE));

    packed1 = Or(packed1, ShiftLeft<14>(rawF));

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 mask = Set(d, 0x3u);  // Lowest 2 bits

    const VU16 packed0 = LoadU(d, packed_in + 0 * N);

    const VU16 packed1 = LoadU(d, packed_in + 1 * N);

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(ShiftRight<2>(packed0), mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(ShiftRight<2>(packed1), mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(ShiftRight<4>(packed0), mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(ShiftRight<4>(packed1), mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(ShiftRight<6>(packed0), mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = And(ShiftRight<6>(packed1), mask);

    StoreU(raw7, d, raw + 7 * N);

    const VU16 raw8 = And(ShiftRight<8>(packed0), mask);

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(ShiftRight<8>(packed1), mask);

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = And(ShiftRight<0xA>(packed0), mask);

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawB = And(ShiftRight<0xA>(packed1), mask);

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 rawC = And(ShiftRight<0xC>(packed0), mask);

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(ShiftRight<0xC>(packed1), mask);

    StoreU(rawD, d, raw + 0xD * N);

    const VU16 rawE = ShiftRight<0xE>(packed0);

    StoreU(rawE, d, raw + 0xE * N);

    const VU16 rawF = ShiftRight<0xE>(packed1);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<2>

template <>

struct Pack16<3> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // We can fit 15 raw vectors in three packed vectors (five each).

    VU16 packed0 = Xor3(ShiftLeft<6>(raw6), ShiftLeft<3>(raw3), raw0);

    VU16 packed1 = Xor3(ShiftLeft<6>(raw7), ShiftLeft<3>(raw4), raw1);

    VU16 packed2 = Xor3(ShiftLeft<6>(raw8), ShiftLeft<3>(raw5), raw2);

    // rawF will be scattered into the upper bit of these three.

    packed0 = Xor3(packed0, ShiftLeft<12>(rawC), ShiftLeft<9>(raw9));

    packed1 = Xor3(packed1, ShiftLeft<12>(rawD), ShiftLeft<9>(rawA));

    packed2 = Xor3(packed2, ShiftLeft<12>(rawE), ShiftLeft<9>(rawB));

    const VU16 hi1 = Set(d, 0x8000u);

    packed0 = Or(packed0, ShiftLeft<15>(rawF));  // MSB only, no mask

    packed1 = OrAnd(packed1, ShiftLeft<14>(rawF), hi1);

    packed2 = OrAnd(packed2, ShiftLeft<13>(rawF), hi1);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 mask = Set(d, 0x7u);  // Lowest 3 bits

    const VU16 packed0 = LoadU(d, packed_in + 0 * N);

    const VU16 packed1 = LoadU(d, packed_in + 1 * N);

    const VU16 packed2 = LoadU(d, packed_in + 2 * N);

    const VU16 raw0 = And(mask, packed0);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(mask, packed1);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(mask, packed2);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(mask, ShiftRight<3>(packed0));

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(mask, ShiftRight<3>(packed1));

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(mask, ShiftRight<3>(packed2));

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(mask, ShiftRight<6>(packed0));

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = And(mask, ShiftRight<6>(packed1));

    StoreU(raw7, d, raw + 7 * N);

    const VU16 raw8 = And(mask, ShiftRight<6>(packed2));

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(mask, ShiftRight<9>(packed0));

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = And(mask, ShiftRight<9>(packed1));

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawB = And(mask, ShiftRight<9>(packed2));

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 rawC = And(mask, ShiftRight<12>(packed0));

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(mask, ShiftRight<12>(packed1));

    StoreU(rawD, d, raw + 0xD * N);

    const VU16 rawE = And(mask, ShiftRight<12>(packed2));

    StoreU(rawE, d, raw + 0xE * N);

    // rawF is the concatenation of the upper bit of packed0..2.

    const VU16 down0 = ShiftRight<15>(packed0);

    const VU16 down1 = ShiftRight<15>(packed1);

    const VU16 down2 = ShiftRight<15>(packed2);

    const VU16 rawF = Xor3(ShiftLeft<2>(down2), Add(down1, down1), down0);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<3>

template <>

struct Pack16<4> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    VU16 packed0 = Xor3(ShiftLeft<8>(raw4), ShiftLeft<4>(raw2), raw0);

    VU16 packed1 = Xor3(ShiftLeft<8>(raw5), ShiftLeft<4>(raw3), raw1);

    packed0 = Or(packed0, ShiftLeft<12>(raw6));

    packed1 = Or(packed1, ShiftLeft<12>(raw7));

    VU16 packed2 = Xor3(ShiftLeft<8>(rawC), ShiftLeft<4>(rawA), raw8);

    VU16 packed3 = Xor3(ShiftLeft<8>(rawD), ShiftLeft<4>(rawB), raw9);

    packed2 = Or(packed2, ShiftLeft<12>(rawE));

    packed3 = Or(packed3, ShiftLeft<12>(rawF));

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 mask = Set(d, 0xFu);  // Lowest 4 bits

    const VU16 packed0 = LoadU(d, packed_in + 0 * N);

    const VU16 packed1 = LoadU(d, packed_in + 1 * N);

    const VU16 packed2 = LoadU(d, packed_in + 2 * N);

    const VU16 packed3 = LoadU(d, packed_in + 3 * N);

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(ShiftRight<4>(packed0), mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(ShiftRight<4>(packed1), mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(ShiftRight<8>(packed0), mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(ShiftRight<8>(packed1), mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = ShiftRight<12>(packed0);  // no mask required

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = ShiftRight<12>(packed1);  // no mask required

    StoreU(raw7, d, raw + 7 * N);

    const VU16 raw8 = And(packed2, mask);

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(packed3, mask);

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = And(ShiftRight<4>(packed2), mask);

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawB = And(ShiftRight<4>(packed3), mask);

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 rawC = And(ShiftRight<8>(packed2), mask);

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(ShiftRight<8>(packed3), mask);

    StoreU(rawD, d, raw + 0xD * N);

    const VU16 rawE = ShiftRight<12>(packed2);  // no mask required

    StoreU(rawE, d, raw + 0xE * N);

    const VU16 rawF = ShiftRight<12>(packed3);  // no mask required

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<4>

template <>

struct Pack16<5> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // We can fit 15 raw vectors in five packed vectors (three each).

    VU16 packed0 = Xor3(ShiftLeft<10>(rawA), ShiftLeft<5>(raw5), raw0);

    VU16 packed1 = Xor3(ShiftLeft<10>(rawB), ShiftLeft<5>(raw6), raw1);

    VU16 packed2 = Xor3(ShiftLeft<10>(rawC), ShiftLeft<5>(raw7), raw2);

    VU16 packed3 = Xor3(ShiftLeft<10>(rawD), ShiftLeft<5>(raw8), raw3);

    VU16 packed4 = Xor3(ShiftLeft<10>(rawE), ShiftLeft<5>(raw9), raw4);

    // rawF will be scattered into the upper bits of these five.

    const VU16 hi1 = Set(d, 0x8000u);

    packed0 = Or(packed0, ShiftLeft<15>(rawF));  // MSB only, no mask

    packed1 = OrAnd(packed1, ShiftLeft<14>(rawF), hi1);

    packed2 = OrAnd(packed2, ShiftLeft<13>(rawF), hi1);

    packed3 = OrAnd(packed3, ShiftLeft<12>(rawF), hi1);

    packed4 = OrAnd(packed4, ShiftLeft<11>(rawF), hi1);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = LoadU(d, packed_in + 0 * N);

    const VU16 packed1 = LoadU(d, packed_in + 1 * N);

    const VU16 packed2 = LoadU(d, packed_in + 2 * N);

    const VU16 packed3 = LoadU(d, packed_in + 3 * N);

    const VU16 packed4 = LoadU(d, packed_in + 4 * N);

    const VU16 mask = Set(d, 0x1Fu);  // Lowest 5 bits

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(packed2, mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(packed3, mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(packed4, mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(ShiftRight<5>(packed0), mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(ShiftRight<5>(packed1), mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = And(ShiftRight<5>(packed2), mask);

    StoreU(raw7, d, raw + 7 * N);

    const VU16 raw8 = And(ShiftRight<5>(packed3), mask);

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(ShiftRight<5>(packed4), mask);

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = And(ShiftRight<10>(packed0), mask);

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawB = And(ShiftRight<10>(packed1), mask);

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 rawC = And(ShiftRight<10>(packed2), mask);

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(ShiftRight<10>(packed3), mask);

    StoreU(rawD, d, raw + 0xD * N);

    const VU16 rawE = And(ShiftRight<10>(packed4), mask);

    StoreU(rawE, d, raw + 0xE * N);

    // rawF is the concatenation of the lower bit of packed0..4.

    const VU16 down0 = ShiftRight<15>(packed0);

    const VU16 down1 = ShiftRight<15>(packed1);

    const VU16 hi1 = Set(d, 0x8000u);

    const VU16 p0 =

        Xor3(ShiftRight<13>(And(packed2, hi1)), Add(down1, down1), down0);

    const VU16 rawF = Xor3(ShiftRight<11>(And(packed4, hi1)),

                           ShiftRight<12>(And(packed3, hi1)), p0);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<5>

template <>

struct Pack16<6> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    const VU16 packed3 = Or(ShiftLeft<6>(raw7), raw3);

    const VU16 packed7 = Or(ShiftLeft<6>(rawF), rawB);

    // Three vectors, two 6-bit raw each; packed3 (12 bits) is spread over the

    // four remainder bits at the top of each vector.

    const VU16 packed0 = Xor3(ShiftLeft<12>(packed3), ShiftLeft<6>(raw4), raw0);

    VU16 packed1 = Or(ShiftLeft<6>(raw5), raw1);

    VU16 packed2 = Or(ShiftLeft<6>(raw6), raw2);

    const VU16 packed4 = Xor3(ShiftLeft<12>(packed7), ShiftLeft<6>(rawC), raw8);

    VU16 packed5 = Or(ShiftLeft<6>(rawD), raw9);

    VU16 packed6 = Or(ShiftLeft<6>(rawE), rawA);

    const VU16 hi4 = Set(d, 0xF000u);

    packed1 = OrAnd(packed1, ShiftLeft<8>(packed3), hi4);

    packed2 = OrAnd(packed2, ShiftLeft<4>(packed3), hi4);

    packed5 = OrAnd(packed5, ShiftLeft<8>(packed7), hi4);

    packed6 = OrAnd(packed6, ShiftLeft<4>(packed7), hi4);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed4, d, packed_out + 3 * N);

    StoreU(packed5, d, packed_out + 4 * N);

    StoreU(packed6, d, packed_out + 5 * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 mask = Set(d, 0x3Fu);  // Lowest 6 bits

    const VU16 packed0 = LoadU(d, packed_in + 0 * N);

    const VU16 packed1 = LoadU(d, packed_in + 1 * N);

    const VU16 packed2 = LoadU(d, packed_in + 2 * N);

    const VU16 packed4 = LoadU(d, packed_in + 3 * N);

    const VU16 packed5 = LoadU(d, packed_in + 4 * N);

    const VU16 packed6 = LoadU(d, packed_in + 5 * N);

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(packed2, mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw4 = And(ShiftRight<6>(packed0), mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(ShiftRight<6>(packed1), mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(ShiftRight<6>(packed2), mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw8 = And(packed4, mask);

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(packed5, mask);

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = And(packed6, mask);

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawC = And(ShiftRight<6>(packed4), mask);

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(ShiftRight<6>(packed5), mask);

    StoreU(rawD, d, raw + 0xD * N);

    const VU16 rawE = And(ShiftRight<6>(packed6), mask);

    StoreU(rawE, d, raw + 0xE * N);

    // packed3 is the concatenation of the four upper bits in packed0..2.

    const VU16 down0 = ShiftRight<12>(packed0);

    const VU16 down4 = ShiftRight<12>(packed4);

    const VU16 hi4 = Set(d, 0xF000u);

    const VU16 packed3 = Xor3(ShiftRight<4>(And(packed2, hi4)),

                              ShiftRight<8>(And(packed1, hi4)), down0);

    const VU16 packed7 = Xor3(ShiftRight<4>(And(packed6, hi4)),

                              ShiftRight<8>(And(packed5, hi4)), down4);

    const VU16 raw3 = And(packed3, mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 rawB = And(packed7, mask);

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 raw7 = ShiftRight<6>(packed3);  // upper bits already zero

    StoreU(raw7, d, raw + 7 * N);

    const VU16 rawF = ShiftRight<6>(packed7);  // upper bits already zero

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<6>

template <>

struct Pack16<7> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    const VU16 packed7 = Or(ShiftLeft<7>(rawF), raw7);

    // Seven vectors, two 7-bit raw each; packed7 (14 bits) is spread over the

    // two remainder bits at the top of each vector.

    const VU16 packed0 = Xor3(ShiftLeft<14>(packed7), ShiftLeft<7>(raw8), raw0);

    VU16 packed1 = Or(ShiftLeft<7>(raw9), raw1);

    VU16 packed2 = Or(ShiftLeft<7>(rawA), raw2);

    VU16 packed3 = Or(ShiftLeft<7>(rawB), raw3);

    VU16 packed4 = Or(ShiftLeft<7>(rawC), raw4);

    VU16 packed5 = Or(ShiftLeft<7>(rawD), raw5);

    VU16 packed6 = Or(ShiftLeft<7>(rawE), raw6);

    const VU16 hi2 = Set(d, 0xC000u);

    packed1 = OrAnd(packed1, ShiftLeft<12>(packed7), hi2);

    packed2 = OrAnd(packed2, ShiftLeft<10>(packed7), hi2);

    packed3 = OrAnd(packed3, ShiftLeft<8>(packed7), hi2);

    packed4 = OrAnd(packed4, ShiftLeft<6>(packed7), hi2);

    packed5 = OrAnd(packed5, ShiftLeft<4>(packed7), hi2);

    packed6 = OrAnd(packed6, ShiftLeft<2>(packed7), hi2);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

    StoreU(packed5, d, packed_out + 5 * N);

    StoreU(packed6, d, packed_out + 6 * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 packed1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 packed2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 packed3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 packed4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 packed5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 packed6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 mask = Set(d, 0x7Fu);  // Lowest 7 bits

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(packed2, mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(packed3, mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(packed4, mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(packed5, mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(packed6, mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw8 = And(ShiftRight<7>(packed0), mask);

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(ShiftRight<7>(packed1), mask);

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = And(ShiftRight<7>(packed2), mask);

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawB = And(ShiftRight<7>(packed3), mask);

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 rawC = And(ShiftRight<7>(packed4), mask);

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(ShiftRight<7>(packed5), mask);

    StoreU(rawD, d, raw + 0xD * N);

    const VU16 rawE = And(ShiftRight<7>(packed6), mask);

    StoreU(rawE, d, raw + 0xE * N);

    // packed7 is the concatenation of the two upper bits in packed0..6.

    const VU16 down0 = ShiftRight<14>(packed0);

    const VU16 hi2 = Set(d, 0xC000u);

    const VU16 p0 = Xor3(ShiftRight<12>(And(packed1, hi2)),

                         ShiftRight<10>(And(packed2, hi2)), down0);

    const VU16 p1 = Xor3(ShiftRight<8>(And(packed3, hi2)),  //

                         ShiftRight<6>(And(packed4, hi2)),

                         ShiftRight<4>(And(packed5, hi2)));

    const VU16 packed7 = Xor3(ShiftRight<2>(And(packed6, hi2)), p1, p0);

    const VU16 raw7 = And(packed7, mask);

    StoreU(raw7, d, raw + 7 * N);

    const VU16 rawF = ShiftRight<7>(packed7);  // upper bits already zero

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<7>

template <>

struct Pack16<8> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // This is equivalent to ConcatEven with 8-bit lanes, but much more

    // efficient on RVV and slightly less efficient on SVE2.

    const VU16 packed0 = Or(ShiftLeft<8>(raw2), raw0);

    const VU16 packed1 = Or(ShiftLeft<8>(raw3), raw1);

    const VU16 packed2 = Or(ShiftLeft<8>(raw6), raw4);

    const VU16 packed3 = Or(ShiftLeft<8>(raw7), raw5);

    const VU16 packed4 = Or(ShiftLeft<8>(rawA), raw8);

    const VU16 packed5 = Or(ShiftLeft<8>(rawB), raw9);

    const VU16 packed6 = Or(ShiftLeft<8>(rawE), rawC);

    const VU16 packed7 = Or(ShiftLeft<8>(rawF), rawD);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

    StoreU(packed5, d, packed_out + 5 * N);

    StoreU(packed6, d, packed_out + 6 * N);

    StoreU(packed7, d, packed_out + 7 * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 packed1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 packed2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 packed3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 packed4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 packed5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 packed6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 packed7 = BitCast(d, LoadU(d, packed_in + 7 * N));

    const VU16 mask = Set(d, 0xFFu);  // Lowest 8 bits

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = ShiftRight<8>(packed0);  // upper bits already zero

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = ShiftRight<8>(packed1);  // upper bits already zero

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(packed2, mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(packed3, mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = ShiftRight<8>(packed2);  // upper bits already zero

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = ShiftRight<8>(packed3);  // upper bits already zero

    StoreU(raw7, d, raw + 7 * N);

    const VU16 raw8 = And(packed4, mask);

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(packed5, mask);

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = ShiftRight<8>(packed4);  // upper bits already zero

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawB = ShiftRight<8>(packed5);  // upper bits already zero

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 rawC = And(packed6, mask);

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(packed7, mask);

    StoreU(rawD, d, raw + 0xD * N);

    const VU16 rawE = ShiftRight<8>(packed6);  // upper bits already zero

    StoreU(rawE, d, raw + 0xE * N);

    const VU16 rawF = ShiftRight<8>(packed7);  // upper bits already zero

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<8>

template <>

struct Pack16<9> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // 8 vectors, each with 9+7 bits; top 2 bits are concatenated into packed8.

    const VU16 packed0 = Or(ShiftLeft<9>(raw8), raw0);

    const VU16 packed1 = Or(ShiftLeft<9>(raw9), raw1);

    const VU16 packed2 = Or(ShiftLeft<9>(rawA), raw2);

    const VU16 packed3 = Or(ShiftLeft<9>(rawB), raw3);

    const VU16 packed4 = Or(ShiftLeft<9>(rawC), raw4);

    const VU16 packed5 = Or(ShiftLeft<9>(rawD), raw5);

    const VU16 packed6 = Or(ShiftLeft<9>(rawE), raw6);

    const VU16 packed7 = Or(ShiftLeft<9>(rawF), raw7);

    // We could shift down, OR and shift up, but two shifts are typically more

    // expensive than AND, shift into position, and OR (which can be further

    // reduced via Xor3).

    const VU16 mid2 = Set(d, 0x180u);  // top 2 in lower 9

    const VU16 part8 = ShiftRight<7>(And(raw8, mid2));

    const VU16 part9 = ShiftRight<5>(And(raw9, mid2));

    const VU16 partA = ShiftRight<3>(And(rawA, mid2));

    const VU16 partB = ShiftRight<1>(And(rawB, mid2));

    const VU16 partC = ShiftLeft<1>(And(rawC, mid2));

    const VU16 partD = ShiftLeft<3>(And(rawD, mid2));

    const VU16 partE = ShiftLeft<5>(And(rawE, mid2));

    const VU16 partF = ShiftLeft<7>(And(rawF, mid2));

    const VU16 packed8 = Xor3(Xor3(part8, part9, partA),

                              Xor3(partB, partC, partD), Or(partE, partF));

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

    StoreU(packed5, d, packed_out + 5 * N);

    StoreU(packed6, d, packed_out + 6 * N);

    StoreU(packed7, d, packed_out + 7 * N);

    StoreU(packed8, d, packed_out + 8 * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 packed1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 packed2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 packed3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 packed4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 packed5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 packed6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 packed7 = BitCast(d, LoadU(d, packed_in + 7 * N));

    const VU16 packed8 = BitCast(d, LoadU(d, packed_in + 8 * N));

    const VU16 mask = Set(d, 0x1FFu);  // Lowest 9 bits

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(packed2, mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(packed3, mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(packed4, mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(packed5, mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(packed6, mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = And(packed7, mask);

    StoreU(raw7, d, raw + 7 * N);

    const VU16 mid2 = Set(d, 0x180u);  // top 2 in lower 9

    const VU16 raw8 =

        OrAnd(ShiftRight<9>(packed0), ShiftLeft<7>(packed8), mid2);

    const VU16 raw9 =

        OrAnd(ShiftRight<9>(packed1), ShiftLeft<5>(packed8), mid2);

    const VU16 rawA =

        OrAnd(ShiftRight<9>(packed2), ShiftLeft<3>(packed8), mid2);

    const VU16 rawB =

        OrAnd(ShiftRight<9>(packed3), ShiftLeft<1>(packed8), mid2);

    const VU16 rawC =

        OrAnd(ShiftRight<9>(packed4), ShiftRight<1>(packed8), mid2);

    const VU16 rawD =

        OrAnd(ShiftRight<9>(packed5), ShiftRight<3>(packed8), mid2);

    const VU16 rawE =

        OrAnd(ShiftRight<9>(packed6), ShiftRight<5>(packed8), mid2);

    const VU16 rawF =

        OrAnd(ShiftRight<9>(packed7), ShiftRight<7>(packed8), mid2);

    StoreU(raw8, d, raw + 8 * N);

    StoreU(raw9, d, raw + 9 * N);

    StoreU(rawA, d, raw + 0xA * N);

    StoreU(rawB, d, raw + 0xB * N);

    StoreU(rawC, d, raw + 0xC * N);

    StoreU(rawD, d, raw + 0xD * N);

    StoreU(rawE, d, raw + 0xE * N);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<9>

template <>

struct Pack16<10> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // 8 vectors, each with 10+6 bits; top 4 bits are concatenated into

    // packed8 and packed9.

    const VU16 packed0 = Or(ShiftLeft<10>(raw8), raw0);

    const VU16 packed1 = Or(ShiftLeft<10>(raw9), raw1);

    const VU16 packed2 = Or(ShiftLeft<10>(rawA), raw2);

    const VU16 packed3 = Or(ShiftLeft<10>(rawB), raw3);

    const VU16 packed4 = Or(ShiftLeft<10>(rawC), raw4);

    const VU16 packed5 = Or(ShiftLeft<10>(rawD), raw5);

    const VU16 packed6 = Or(ShiftLeft<10>(rawE), raw6);

    const VU16 packed7 = Or(ShiftLeft<10>(rawF), raw7);

    // We could shift down, OR and shift up, but two shifts are typically more

    // expensive than AND, shift into position, and OR (which can be further

    // reduced via Xor3).

    const VU16 mid4 = Set(d, 0x3C0u);  // top 4 in lower 10

    const VU16 part8 = ShiftRight<6>(And(raw8, mid4));

    const VU16 part9 = ShiftRight<2>(And(raw9, mid4));

    const VU16 partA = ShiftLeft<2>(And(rawA, mid4));

    const VU16 partB = ShiftLeft<6>(And(rawB, mid4));

    const VU16 partC = ShiftRight<6>(And(rawC, mid4));

    const VU16 partD = ShiftRight<2>(And(rawD, mid4));

    const VU16 partE = ShiftLeft<2>(And(rawE, mid4));

    const VU16 partF = ShiftLeft<6>(And(rawF, mid4));

    const VU16 packed8 = Or(Xor3(part8, part9, partA), partB);

    const VU16 packed9 = Or(Xor3(partC, partD, partE), partF);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

    StoreU(packed5, d, packed_out + 5 * N);

    StoreU(packed6, d, packed_out + 6 * N);

    StoreU(packed7, d, packed_out + 7 * N);

    StoreU(packed8, d, packed_out + 8 * N);

    StoreU(packed9, d, packed_out + 9 * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 packed1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 packed2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 packed3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 packed4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 packed5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 packed6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 packed7 = BitCast(d, LoadU(d, packed_in + 7 * N));

    const VU16 packed8 = BitCast(d, LoadU(d, packed_in + 8 * N));

    const VU16 packed9 = BitCast(d, LoadU(d, packed_in + 9 * N));

    const VU16 mask = Set(d, 0x3FFu);  // Lowest 10 bits

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(packed2, mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(packed3, mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(packed4, mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(packed5, mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(packed6, mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = And(packed7, mask);

    StoreU(raw7, d, raw + 7 * N);

    const VU16 mid4 = Set(d, 0x3C0u);  // top 4 in lower 10

    const VU16 raw8 =

        OrAnd(ShiftRight<10>(packed0), ShiftLeft<6>(packed8), mid4);

    const VU16 raw9 =

        OrAnd(ShiftRight<10>(packed1), ShiftLeft<2>(packed8), mid4);

    const VU16 rawA =

        OrAnd(ShiftRight<10>(packed2), ShiftRight<2>(packed8), mid4);

    const VU16 rawB =

        OrAnd(ShiftRight<10>(packed3), ShiftRight<6>(packed8), mid4);

    const VU16 rawC =

        OrAnd(ShiftRight<10>(packed4), ShiftLeft<6>(packed9), mid4);

    const VU16 rawD =

        OrAnd(ShiftRight<10>(packed5), ShiftLeft<2>(packed9), mid4);

    const VU16 rawE =

        OrAnd(ShiftRight<10>(packed6), ShiftRight<2>(packed9), mid4);

    const VU16 rawF =

        OrAnd(ShiftRight<10>(packed7), ShiftRight<6>(packed9), mid4);

    StoreU(raw8, d, raw + 8 * N);

    StoreU(raw9, d, raw + 9 * N);

    StoreU(rawA, d, raw + 0xA * N);

    StoreU(rawB, d, raw + 0xB * N);

    StoreU(rawC, d, raw + 0xC * N);

    StoreU(rawD, d, raw + 0xD * N);

    StoreU(rawE, d, raw + 0xE * N);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<10>

template <>

struct Pack16<11> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // It is not obvious what the optimal partitioning looks like. To reduce the

    // number of constants, we want to minimize the number of distinct bit

    // lengths. 11+5 also requires 6-bit remnants with 4-bit leftovers.

    // 8+3 seems better: it is easier to scatter 3 bits into the MSBs.

    const VU16 lo8 = Set(d, 0xFFu);

    // Lower 8 bits of all raw

    const VU16 packed0 = OrAnd(ShiftLeft<8>(raw1), raw0, lo8);

    const VU16 packed1 = OrAnd(ShiftLeft<8>(raw3), raw2, lo8);

    const VU16 packed2 = OrAnd(ShiftLeft<8>(raw5), raw4, lo8);

    const VU16 packed3 = OrAnd(ShiftLeft<8>(raw7), raw6, lo8);

    const VU16 packed4 = OrAnd(ShiftLeft<8>(raw9), raw8, lo8);

    const VU16 packed5 = OrAnd(ShiftLeft<8>(rawB), rawA, lo8);

    const VU16 packed6 = OrAnd(ShiftLeft<8>(rawD), rawC, lo8);

    const VU16 packed7 = OrAnd(ShiftLeft<8>(rawF), rawE, lo8);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

    StoreU(packed5, d, packed_out + 5 * N);

    StoreU(packed6, d, packed_out + 6 * N);

    StoreU(packed7, d, packed_out + 7 * N);

    // Three vectors, five 3bit remnants each, plus one 3bit in their MSB.

    const VU16 top0 = ShiftRight<8>(raw0);

    const VU16 top1 = ShiftRight<8>(raw1);

    const VU16 top2 = ShiftRight<8>(raw2);

    // Insert top raw bits into 3-bit groups within packed8..A. Moving the

    // mask along avoids masking each of raw0..E and enables OrAnd.

    VU16 next = Set(d, 0x38u);  // 0x7 << 3

    VU16 packed8 = OrAnd(top0, ShiftRight<5>(raw3), next);

    VU16 packed9 = OrAnd(top1, ShiftRight<5>(raw4), next);

    VU16 packedA = OrAnd(top2, ShiftRight<5>(raw5), next);

    next = ShiftLeft<3>(next);

    packed8 = OrAnd(packed8, ShiftRight<2>(raw6), next);

    packed9 = OrAnd(packed9, ShiftRight<2>(raw7), next);

    packedA = OrAnd(packedA, ShiftRight<2>(raw8), next);

    next = ShiftLeft<3>(next);

    packed8 = OrAnd(packed8, Add(raw9, raw9), next);

    packed9 = OrAnd(packed9, Add(rawA, rawA), next);

    packedA = OrAnd(packedA, Add(rawB, rawB), next);

    next = ShiftLeft<3>(next);

    packed8 = OrAnd(packed8, ShiftLeft<4>(rawC), next);

    packed9 = OrAnd(packed9, ShiftLeft<4>(rawD), next);

    packedA = OrAnd(packedA, ShiftLeft<4>(rawE), next);

    // Scatter upper 3 bits of rawF into the upper bits.

    next = ShiftLeft<3>(next);  // = 0x8000u

    packed8 = OrAnd(packed8, ShiftLeft<7>(rawF), next);

    packed9 = OrAnd(packed9, ShiftLeft<6>(rawF), next);

    packedA = OrAnd(packedA, ShiftLeft<5>(rawF), next);

    StoreU(packed8, d, packed_out + 8 * N);

    StoreU(packed9, d, packed_out + 9 * N);

    StoreU(packedA, d, packed_out + 0xA * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 packed1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 packed2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 packed3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 packed4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 packed5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 packed6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 packed7 = BitCast(d, LoadU(d, packed_in + 7 * N));

    const VU16 packed8 = BitCast(d, LoadU(d, packed_in + 8 * N));

    const VU16 packed9 = BitCast(d, LoadU(d, packed_in + 9 * N));

    const VU16 packedA = BitCast(d, LoadU(d, packed_in + 0xA * N));

    const VU16 mask = Set(d, 0xFFu);  // Lowest 8 bits

    const VU16 down0 = And(packed0, mask);

    const VU16 down1 = ShiftRight<8>(packed0);

    const VU16 down2 = And(packed1, mask);

    const VU16 down3 = ShiftRight<8>(packed1);

    const VU16 down4 = And(packed2, mask);

    const VU16 down5 = ShiftRight<8>(packed2);

    const VU16 down6 = And(packed3, mask);

    const VU16 down7 = ShiftRight<8>(packed3);

    const VU16 down8 = And(packed4, mask);

    const VU16 down9 = ShiftRight<8>(packed4);

    const VU16 downA = And(packed5, mask);

    const VU16 downB = ShiftRight<8>(packed5);

    const VU16 downC = And(packed6, mask);

    const VU16 downD = ShiftRight<8>(packed6);

    const VU16 downE = And(packed7, mask);

    const VU16 downF = ShiftRight<8>(packed7);

    // Three bits from packed8..A, eight bits from down0..F.

    const VU16 hi3 = Set(d, 0x700u);

    const VU16 raw0 = OrAnd(down0, ShiftLeft<8>(packed8), hi3);

    const VU16 raw1 = OrAnd(down1, ShiftLeft<8>(packed9), hi3);

    const VU16 raw2 = OrAnd(down2, ShiftLeft<8>(packedA), hi3);

    const VU16 raw3 = OrAnd(down3, ShiftLeft<5>(packed8), hi3);

    const VU16 raw4 = OrAnd(down4, ShiftLeft<5>(packed9), hi3);

    const VU16 raw5 = OrAnd(down5, ShiftLeft<5>(packedA), hi3);

    const VU16 raw6 = OrAnd(down6, ShiftLeft<2>(packed8), hi3);

    const VU16 raw7 = OrAnd(down7, ShiftLeft<2>(packed9), hi3);

    const VU16 raw8 = OrAnd(down8, ShiftLeft<2>(packedA), hi3);

    const VU16 raw9 = OrAnd(down9, ShiftRight<1>(packed8), hi3);

    const VU16 rawA = OrAnd(downA, ShiftRight<1>(packed9), hi3);

    const VU16 rawB = OrAnd(downB, ShiftRight<1>(packedA), hi3);

    const VU16 rawC = OrAnd(downC, ShiftRight<4>(packed8), hi3);

    const VU16 rawD = OrAnd(downD, ShiftRight<4>(packed9), hi3);

    const VU16 rawE = OrAnd(downE, ShiftRight<4>(packedA), hi3);

    // Shift MSB into the top 3-of-11 and mask.

    const VU16 rawF = Or(downF, Xor3(And(ShiftRight<7>(packed8), hi3),

                                     And(ShiftRight<6>(packed9), hi3),

                                     And(ShiftRight<5>(packedA), hi3)));

    StoreU(raw0, d, raw + 0 * N);

    StoreU(raw1, d, raw + 1 * N);

    StoreU(raw2, d, raw + 2 * N);

    StoreU(raw3, d, raw + 3 * N);

    StoreU(raw4, d, raw + 4 * N);

    StoreU(raw5, d, raw + 5 * N);

    StoreU(raw6, d, raw + 6 * N);

    StoreU(raw7, d, raw + 7 * N);

    StoreU(raw8, d, raw + 8 * N);

    StoreU(raw9, d, raw + 9 * N);

    StoreU(rawA, d, raw + 0xA * N);

    StoreU(rawB, d, raw + 0xB * N);

    StoreU(rawC, d, raw + 0xC * N);

    StoreU(rawD, d, raw + 0xD * N);

    StoreU(rawE, d, raw + 0xE * N);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<11>

template <>

struct Pack16<12> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // 8 vectors, each with 12+4 bits; top 8 bits are concatenated into

    // packed8 to packedB.

    const VU16 packed0 = Or(ShiftLeft<12>(raw8), raw0);

    const VU16 packed1 = Or(ShiftLeft<12>(raw9), raw1);

    const VU16 packed2 = Or(ShiftLeft<12>(rawA), raw2);

    const VU16 packed3 = Or(ShiftLeft<12>(rawB), raw3);

    const VU16 packed4 = Or(ShiftLeft<12>(rawC), raw4);

    const VU16 packed5 = Or(ShiftLeft<12>(rawD), raw5);

    const VU16 packed6 = Or(ShiftLeft<12>(rawE), raw6);

    const VU16 packed7 = Or(ShiftLeft<12>(rawF), raw7);

    // Masking after shifting left enables OrAnd.

    const VU16 hi8 = Set(d, 0xFF00u);

    const VU16 packed8 = OrAnd(ShiftRight<4>(raw8), ShiftLeft<4>(raw9), hi8);

    const VU16 packed9 = OrAnd(ShiftRight<4>(rawA), ShiftLeft<4>(rawB), hi8);

    const VU16 packedA = OrAnd(ShiftRight<4>(rawC), ShiftLeft<4>(rawD), hi8);

    const VU16 packedB = OrAnd(ShiftRight<4>(rawE), ShiftLeft<4>(rawF), hi8);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

    StoreU(packed5, d, packed_out + 5 * N);

    StoreU(packed6, d, packed_out + 6 * N);

    StoreU(packed7, d, packed_out + 7 * N);

    StoreU(packed8, d, packed_out + 8 * N);

    StoreU(packed9, d, packed_out + 9 * N);

    StoreU(packedA, d, packed_out + 0xA * N);

    StoreU(packedB, d, packed_out + 0xB * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 packed1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 packed2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 packed3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 packed4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 packed5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 packed6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 packed7 = BitCast(d, LoadU(d, packed_in + 7 * N));

    const VU16 packed8 = BitCast(d, LoadU(d, packed_in + 8 * N));

    const VU16 packed9 = BitCast(d, LoadU(d, packed_in + 9 * N));

    const VU16 packedA = BitCast(d, LoadU(d, packed_in + 0xA * N));

    const VU16 packedB = BitCast(d, LoadU(d, packed_in + 0xB * N));

    const VU16 mask = Set(d, 0xFFFu);  // Lowest 12 bits

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(packed2, mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(packed3, mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(packed4, mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(packed5, mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(packed6, mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = And(packed7, mask);

    StoreU(raw7, d, raw + 7 * N);

    const VU16 mid8 = Set(d, 0xFF0u);  // upper 8 in lower 12

    const VU16 raw8 =

        OrAnd(ShiftRight<12>(packed0), ShiftLeft<4>(packed8), mid8);

    const VU16 raw9 =

        OrAnd(ShiftRight<12>(packed1), ShiftRight<4>(packed8), mid8);

    const VU16 rawA =

        OrAnd(ShiftRight<12>(packed2), ShiftLeft<4>(packed9), mid8);

    const VU16 rawB =

        OrAnd(ShiftRight<12>(packed3), ShiftRight<4>(packed9), mid8);

    const VU16 rawC =

        OrAnd(ShiftRight<12>(packed4), ShiftLeft<4>(packedA), mid8);

    const VU16 rawD =

        OrAnd(ShiftRight<12>(packed5), ShiftRight<4>(packedA), mid8);

    const VU16 rawE =

        OrAnd(ShiftRight<12>(packed6), ShiftLeft<4>(packedB), mid8);

    const VU16 rawF =

        OrAnd(ShiftRight<12>(packed7), ShiftRight<4>(packedB), mid8);

    StoreU(raw8, d, raw + 8 * N);

    StoreU(raw9, d, raw + 9 * N);

    StoreU(rawA, d, raw + 0xA * N);

    StoreU(rawB, d, raw + 0xB * N);

    StoreU(rawC, d, raw + 0xC * N);

    StoreU(rawD, d, raw + 0xD * N);

    StoreU(rawE, d, raw + 0xE * N);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<12>

template <>

struct Pack16<13> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // As with 11 bits, it is not obvious what the optimal partitioning looks

    // like. We similarly go with an 8+5 split.

    const VU16 lo8 = Set(d, 0xFFu);

    // Lower 8 bits of all raw

    const VU16 packed0 = OrAnd(ShiftLeft<8>(raw1), raw0, lo8);

    const VU16 packed1 = OrAnd(ShiftLeft<8>(raw3), raw2, lo8);

    const VU16 packed2 = OrAnd(ShiftLeft<8>(raw5), raw4, lo8);

    const VU16 packed3 = OrAnd(ShiftLeft<8>(raw7), raw6, lo8);

    const VU16 packed4 = OrAnd(ShiftLeft<8>(raw9), raw8, lo8);

    const VU16 packed5 = OrAnd(ShiftLeft<8>(rawB), rawA, lo8);

    const VU16 packed6 = OrAnd(ShiftLeft<8>(rawD), rawC, lo8);

    const VU16 packed7 = OrAnd(ShiftLeft<8>(rawF), rawE, lo8);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

    StoreU(packed5, d, packed_out + 5 * N);

    StoreU(packed6, d, packed_out + 6 * N);

    StoreU(packed7, d, packed_out + 7 * N);

    // Five vectors, three 5bit remnants each, plus one 5bit in their MSB.

    const VU16 top0 = ShiftRight<8>(raw0);

    const VU16 top1 = ShiftRight<8>(raw1);

    const VU16 top2 = ShiftRight<8>(raw2);

    const VU16 top3 = ShiftRight<8>(raw3);

    const VU16 top4 = ShiftRight<8>(raw4);

    // Insert top raw bits into 5-bit groups within packed8..C. Moving the

    // mask along avoids masking each of raw0..E and enables OrAnd.

    VU16 next = Set(d, 0x3E0u);  // 0x1F << 5

    VU16 packed8 = OrAnd(top0, ShiftRight<3>(raw5), next);

    VU16 packed9 = OrAnd(top1, ShiftRight<3>(raw6), next);

    VU16 packedA = OrAnd(top2, ShiftRight<3>(raw7), next);

    VU16 packedB = OrAnd(top3, ShiftRight<3>(raw8), next);

    VU16 packedC = OrAnd(top4, ShiftRight<3>(raw9), next);

    next = ShiftLeft<5>(next);

    packed8 = OrAnd(packed8, ShiftLeft<2>(rawA), next);

    packed9 = OrAnd(packed9, ShiftLeft<2>(rawB), next);

    packedA = OrAnd(packedA, ShiftLeft<2>(rawC), next);

    packedB = OrAnd(packedB, ShiftLeft<2>(rawD), next);

    packedC = OrAnd(packedC, ShiftLeft<2>(rawE), next);

    // Scatter upper 5 bits of rawF into the upper bits.

    next = ShiftLeft<3>(next);  // = 0x8000u

    packed8 = OrAnd(packed8, ShiftLeft<7>(rawF), next);

    packed9 = OrAnd(packed9, ShiftLeft<6>(rawF), next);

    packedA = OrAnd(packedA, ShiftLeft<5>(rawF), next);

    packedB = OrAnd(packedB, ShiftLeft<4>(rawF), next);

    packedC = OrAnd(packedC, ShiftLeft<3>(rawF), next);

    StoreU(packed8, d, packed_out + 8 * N);

    StoreU(packed9, d, packed_out + 9 * N);

    StoreU(packedA, d, packed_out + 0xA * N);

    StoreU(packedB, d, packed_out + 0xB * N);

    StoreU(packedC, d, packed_out + 0xC * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 packed1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 packed2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 packed3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 packed4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 packed5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 packed6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 packed7 = BitCast(d, LoadU(d, packed_in + 7 * N));

    const VU16 packed8 = BitCast(d, LoadU(d, packed_in + 8 * N));

    const VU16 packed9 = BitCast(d, LoadU(d, packed_in + 9 * N));

    const VU16 packedA = BitCast(d, LoadU(d, packed_in + 0xA * N));

    const VU16 packedB = BitCast(d, LoadU(d, packed_in + 0xB * N));

    const VU16 packedC = BitCast(d, LoadU(d, packed_in + 0xC * N));

    const VU16 mask = Set(d, 0xFFu);  // Lowest 8 bits

    const VU16 down0 = And(packed0, mask);

    const VU16 down1 = ShiftRight<8>(packed0);

    const VU16 down2 = And(packed1, mask);

    const VU16 down3 = ShiftRight<8>(packed1);

    const VU16 down4 = And(packed2, mask);

    const VU16 down5 = ShiftRight<8>(packed2);

    const VU16 down6 = And(packed3, mask);

    const VU16 down7 = ShiftRight<8>(packed3);

    const VU16 down8 = And(packed4, mask);

    const VU16 down9 = ShiftRight<8>(packed4);

    const VU16 downA = And(packed5, mask);

    const VU16 downB = ShiftRight<8>(packed5);

    const VU16 downC = And(packed6, mask);

    const VU16 downD = ShiftRight<8>(packed6);

    const VU16 downE = And(packed7, mask);

    const VU16 downF = ShiftRight<8>(packed7);

    // Upper five bits from packed8..C, eight bits from down0..F.

    const VU16 hi5 = Set(d, 0x1F00u);

    const VU16 raw0 = OrAnd(down0, ShiftLeft<8>(packed8), hi5);

    const VU16 raw1 = OrAnd(down1, ShiftLeft<8>(packed9), hi5);

    const VU16 raw2 = OrAnd(down2, ShiftLeft<8>(packedA), hi5);

    const VU16 raw3 = OrAnd(down3, ShiftLeft<8>(packedB), hi5);

    const VU16 raw4 = OrAnd(down4, ShiftLeft<8>(packedC), hi5);

    const VU16 raw5 = OrAnd(down5, ShiftLeft<3>(packed8), hi5);

    const VU16 raw6 = OrAnd(down6, ShiftLeft<3>(packed9), hi5);

    const VU16 raw7 = OrAnd(down7, ShiftLeft<3>(packedA), hi5);

    const VU16 raw8 = OrAnd(down8, ShiftLeft<3>(packed9), hi5);

    const VU16 raw9 = OrAnd(down9, ShiftLeft<3>(packedA), hi5);

    const VU16 rawA = OrAnd(downA, ShiftRight<2>(packed8), hi5);

    const VU16 rawB = OrAnd(downB, ShiftRight<2>(packed9), hi5);

    const VU16 rawC = OrAnd(downC, ShiftRight<2>(packedA), hi5);

    const VU16 rawD = OrAnd(downD, ShiftRight<2>(packed9), hi5);

    const VU16 rawE = OrAnd(downE, ShiftRight<2>(packedA), hi5);

    // Shift MSB into the top 5-of-11 and mask.

    const VU16 p0 = Xor3(And(ShiftRight<7>(packed8), hi5),  //

                         And(ShiftRight<6>(packed9), hi5),

                         And(ShiftRight<5>(packedA), hi5));

    const VU16 p1 = Xor3(And(ShiftRight<4>(packedB), hi5),

                         And(ShiftRight<3>(packedC), hi5), downF);

    const VU16 rawF = Or(p0, p1);

    StoreU(raw0, d, raw + 0 * N);

    StoreU(raw1, d, raw + 1 * N);

    StoreU(raw2, d, raw + 2 * N);

    StoreU(raw3, d, raw + 3 * N);

    StoreU(raw4, d, raw + 4 * N);

    StoreU(raw5, d, raw + 5 * N);

    StoreU(raw6, d, raw + 6 * N);

    StoreU(raw7, d, raw + 7 * N);

    StoreU(raw8, d, raw + 8 * N);

    StoreU(raw9, d, raw + 9 * N);

    StoreU(rawA, d, raw + 0xA * N);

    StoreU(rawB, d, raw + 0xB * N);

    StoreU(rawC, d, raw + 0xC * N);

    StoreU(rawD, d, raw + 0xD * N);

    StoreU(rawE, d, raw + 0xE * N);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<13>

template <>

struct Pack16<14> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // 14 vectors, each with 14+2 bits; two raw vectors are scattered

    // across the upper 2 bits.

    const VU16 hi2 = Set(d, 0xC000u);

    const VU16 packed0 = Or(raw0, ShiftLeft<14>(rawE));

    const VU16 packed1 = OrAnd(raw1, ShiftLeft<12>(rawE), hi2);

    const VU16 packed2 = OrAnd(raw2, ShiftLeft<10>(rawE), hi2);

    const VU16 packed3 = OrAnd(raw3, ShiftLeft<8>(rawE), hi2);

    const VU16 packed4 = OrAnd(raw4, ShiftLeft<6>(rawE), hi2);

    const VU16 packed5 = OrAnd(raw5, ShiftLeft<4>(rawE), hi2);

    const VU16 packed6 = OrAnd(raw6, ShiftLeft<2>(rawE), hi2);

    const VU16 packed7 = Or(raw7, ShiftLeft<14>(rawF));

    const VU16 packed8 = OrAnd(raw8, ShiftLeft<12>(rawF), hi2);

    const VU16 packed9 = OrAnd(raw9, ShiftLeft<10>(rawF), hi2);

    const VU16 packedA = OrAnd(rawA, ShiftLeft<8>(rawF), hi2);

    const VU16 packedB = OrAnd(rawB, ShiftLeft<6>(rawF), hi2);

    const VU16 packedC = OrAnd(rawC, ShiftLeft<4>(rawF), hi2);

    const VU16 packedD = OrAnd(rawD, ShiftLeft<2>(rawF), hi2);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

    StoreU(packed5, d, packed_out + 5 * N);

    StoreU(packed6, d, packed_out + 6 * N);

    StoreU(packed7, d, packed_out + 7 * N);

    StoreU(packed8, d, packed_out + 8 * N);

    StoreU(packed9, d, packed_out + 9 * N);

    StoreU(packedA, d, packed_out + 0xA * N);

    StoreU(packedB, d, packed_out + 0xB * N);

    StoreU(packedC, d, packed_out + 0xC * N);

    StoreU(packedD, d, packed_out + 0xD * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 packed1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 packed2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 packed3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 packed4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 packed5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 packed6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 packed7 = BitCast(d, LoadU(d, packed_in + 7 * N));

    const VU16 packed8 = BitCast(d, LoadU(d, packed_in + 8 * N));

    const VU16 packed9 = BitCast(d, LoadU(d, packed_in + 9 * N));

    const VU16 packedA = BitCast(d, LoadU(d, packed_in + 0xA * N));

    const VU16 packedB = BitCast(d, LoadU(d, packed_in + 0xB * N));

    const VU16 packedC = BitCast(d, LoadU(d, packed_in + 0xC * N));

    const VU16 packedD = BitCast(d, LoadU(d, packed_in + 0xD * N));

    const VU16 mask = Set(d, 0x3FFFu);  // Lowest 14 bits

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(packed2, mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(packed3, mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(packed4, mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(packed5, mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(packed6, mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = And(packed7, mask);

    StoreU(raw7, d, raw + 7 * N);

    const VU16 raw8 = And(packed8, mask);

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(packed9, mask);

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = And(packedA, mask);

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawB = And(packedB, mask);

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 rawC = And(packedC, mask);

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(packedD, mask);

    StoreU(rawD, d, raw + 0xD * N);

    // rawE is the concatenation of the top two bits in packed0..6.

    const VU16 E0 = Xor3(ShiftRight<14>(packed0),  //

                         ShiftRight<12>(AndNot(mask, packed1)),

                         ShiftRight<10>(AndNot(mask, packed2)));

    const VU16 E1 = Xor3(ShiftRight<8>(AndNot(mask, packed3)),

                         ShiftRight<6>(AndNot(mask, packed4)),

                         ShiftRight<4>(AndNot(mask, packed5)));

    const VU16 rawE = Xor3(ShiftRight<2>(AndNot(mask, packed6)), E0, E1);

    const VU16 F0 = Xor3(ShiftRight<14>(AndNot(mask, packed7)),

                         ShiftRight<12>(AndNot(mask, packed8)),

                         ShiftRight<10>(AndNot(mask, packed9)));

    const VU16 F1 = Xor3(ShiftRight<8>(AndNot(mask, packedA)),

                         ShiftRight<6>(AndNot(mask, packedB)),

                         ShiftRight<4>(AndNot(mask, packedC)));

    const VU16 rawF = Xor3(ShiftRight<2>(AndNot(mask, packedD)), F0, F1);

    StoreU(rawE, d, raw + 0xE * N);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<14>

template <>

struct Pack16<15> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    // 15 vectors, each with 15+1 bits; one packed vector is scattered

    // across the upper bit.

    const VU16 hi1 = Set(d, 0x8000u);

    const VU16 packed0 = Or(raw0, ShiftLeft<15>(rawF));

    const VU16 packed1 = OrAnd(raw1, ShiftLeft<14>(rawF), hi1);

    const VU16 packed2 = OrAnd(raw2, ShiftLeft<13>(rawF), hi1);

    const VU16 packed3 = OrAnd(raw3, ShiftLeft<12>(rawF), hi1);

    const VU16 packed4 = OrAnd(raw4, ShiftLeft<11>(rawF), hi1);

    const VU16 packed5 = OrAnd(raw5, ShiftLeft<10>(rawF), hi1);

    const VU16 packed6 = OrAnd(raw6, ShiftLeft<9>(rawF), hi1);

    const VU16 packed7 = OrAnd(raw7, ShiftLeft<8>(rawF), hi1);

    const VU16 packed8 = OrAnd(raw8, ShiftLeft<7>(rawF), hi1);

    const VU16 packed9 = OrAnd(raw9, ShiftLeft<6>(rawF), hi1);

    const VU16 packedA = OrAnd(rawA, ShiftLeft<5>(rawF), hi1);

    const VU16 packedB = OrAnd(rawB, ShiftLeft<4>(rawF), hi1);

    const VU16 packedC = OrAnd(rawC, ShiftLeft<3>(rawF), hi1);

    const VU16 packedD = OrAnd(rawD, ShiftLeft<2>(rawF), hi1);

    const VU16 packedE = OrAnd(rawE, ShiftLeft<1>(rawF), hi1);

    StoreU(packed0, d, packed_out + 0 * N);

    StoreU(packed1, d, packed_out + 1 * N);

    StoreU(packed2, d, packed_out + 2 * N);

    StoreU(packed3, d, packed_out + 3 * N);

    StoreU(packed4, d, packed_out + 4 * N);

    StoreU(packed5, d, packed_out + 5 * N);

    StoreU(packed6, d, packed_out + 6 * N);

    StoreU(packed7, d, packed_out + 7 * N);

    StoreU(packed8, d, packed_out + 8 * N);

    StoreU(packed9, d, packed_out + 9 * N);

    StoreU(packedA, d, packed_out + 0xA * N);

    StoreU(packedB, d, packed_out + 0xB * N);

    StoreU(packedC, d, packed_out + 0xC * N);

    StoreU(packedD, d, packed_out + 0xD * N);

    StoreU(packedE, d, packed_out + 0xE * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 packed0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 packed1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 packed2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 packed3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 packed4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 packed5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 packed6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 packed7 = BitCast(d, LoadU(d, packed_in + 7 * N));

    const VU16 packed8 = BitCast(d, LoadU(d, packed_in + 8 * N));

    const VU16 packed9 = BitCast(d, LoadU(d, packed_in + 9 * N));

    const VU16 packedA = BitCast(d, LoadU(d, packed_in + 0xA * N));

    const VU16 packedB = BitCast(d, LoadU(d, packed_in + 0xB * N));

    const VU16 packedC = BitCast(d, LoadU(d, packed_in + 0xC * N));

    const VU16 packedD = BitCast(d, LoadU(d, packed_in + 0xD * N));

    const VU16 packedE = BitCast(d, LoadU(d, packed_in + 0xE * N));

    const VU16 mask = Set(d, 0x7FFFu);  // Lowest 15 bits

    const VU16 raw0 = And(packed0, mask);

    StoreU(raw0, d, raw + 0 * N);

    const VU16 raw1 = And(packed1, mask);

    StoreU(raw1, d, raw + 1 * N);

    const VU16 raw2 = And(packed2, mask);

    StoreU(raw2, d, raw + 2 * N);

    const VU16 raw3 = And(packed3, mask);

    StoreU(raw3, d, raw + 3 * N);

    const VU16 raw4 = And(packed4, mask);

    StoreU(raw4, d, raw + 4 * N);

    const VU16 raw5 = And(packed5, mask);

    StoreU(raw5, d, raw + 5 * N);

    const VU16 raw6 = And(packed6, mask);

    StoreU(raw6, d, raw + 6 * N);

    const VU16 raw7 = And(packed7, mask);

    StoreU(raw7, d, raw + 7 * N);

    const VU16 raw8 = And(packed8, mask);

    StoreU(raw8, d, raw + 8 * N);

    const VU16 raw9 = And(packed9, mask);

    StoreU(raw9, d, raw + 9 * N);

    const VU16 rawA = And(packedA, mask);

    StoreU(rawA, d, raw + 0xA * N);

    const VU16 rawB = And(packedB, mask);

    StoreU(rawB, d, raw + 0xB * N);

    const VU16 rawC = And(packedC, mask);

    StoreU(rawC, d, raw + 0xC * N);

    const VU16 rawD = And(packedD, mask);

    StoreU(rawD, d, raw + 0xD * N);

    const VU16 rawE = And(packedE, mask);

    StoreU(rawE, d, raw + 0xE * N);

    // rawF is the concatenation of the top bit in packed0..E.

    const VU16 F0 = Xor3(ShiftRight<15>(packed0),  //

                         ShiftRight<14>(AndNot(mask, packed1)),

                         ShiftRight<13>(AndNot(mask, packed2)));

    const VU16 F1 = Xor3(ShiftRight<12>(AndNot(mask, packed3)),

                         ShiftRight<11>(AndNot(mask, packed4)),

                         ShiftRight<10>(AndNot(mask, packed5)));

    const VU16 F2 = Xor3(ShiftRight<9>(AndNot(mask, packed6)),

                         ShiftRight<8>(AndNot(mask, packed7)),

                         ShiftRight<7>(AndNot(mask, packed8)));

    const VU16 F3 = Xor3(ShiftRight<6>(AndNot(mask, packed9)),

                         ShiftRight<5>(AndNot(mask, packedA)),

                         ShiftRight<4>(AndNot(mask, packedB)));

    const VU16 F4 = Xor3(ShiftRight<3>(AndNot(mask, packedC)),

                         ShiftRight<2>(AndNot(mask, packedD)),

                         ShiftRight<1>(AndNot(mask, packedE)));

    const VU16 rawF = Xor3(F0, F1, Xor3(F2, F3, F4));

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<15>

template <>

struct Pack16<16> {

  template <class D>

  HWY_INLINE void Pack(D d, const uint16_t* HWY_RESTRICT raw,

                       uint16_t* HWY_RESTRICT packed_out) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = LoadU(d, raw + 0 * N);

    const VU16 raw1 = LoadU(d, raw + 1 * N);

    const VU16 raw2 = LoadU(d, raw + 2 * N);

    const VU16 raw3 = LoadU(d, raw + 3 * N);

    const VU16 raw4 = LoadU(d, raw + 4 * N);

    const VU16 raw5 = LoadU(d, raw + 5 * N);

    const VU16 raw6 = LoadU(d, raw + 6 * N);

    const VU16 raw7 = LoadU(d, raw + 7 * N);

    const VU16 raw8 = LoadU(d, raw + 8 * N);

    const VU16 raw9 = LoadU(d, raw + 9 * N);

    const VU16 rawA = LoadU(d, raw + 0xA * N);

    const VU16 rawB = LoadU(d, raw + 0xB * N);

    const VU16 rawC = LoadU(d, raw + 0xC * N);

    const VU16 rawD = LoadU(d, raw + 0xD * N);

    const VU16 rawE = LoadU(d, raw + 0xE * N);

    const VU16 rawF = LoadU(d, raw + 0xF * N);

    StoreU(raw0, d, packed_out + 0 * N);

    StoreU(raw1, d, packed_out + 1 * N);

    StoreU(raw2, d, packed_out + 2 * N);

    StoreU(raw3, d, packed_out + 3 * N);

    StoreU(raw4, d, packed_out + 4 * N);

    StoreU(raw5, d, packed_out + 5 * N);

    StoreU(raw6, d, packed_out + 6 * N);

    StoreU(raw7, d, packed_out + 7 * N);

    StoreU(raw8, d, packed_out + 8 * N);

    StoreU(raw9, d, packed_out + 9 * N);

    StoreU(rawA, d, packed_out + 0xA * N);

    StoreU(rawB, d, packed_out + 0xB * N);

    StoreU(rawC, d, packed_out + 0xC * N);

    StoreU(rawD, d, packed_out + 0xD * N);

    StoreU(rawE, d, packed_out + 0xE * N);

    StoreU(rawF, d, packed_out + 0xF * N);

  template <class D>

  HWY_INLINE void Unpack(D d, const uint16_t* HWY_RESTRICT packed_in,

                         uint16_t* HWY_RESTRICT raw) const {

    using VU16 = Vec<decltype(d)>;

    const size_t N = Lanes(d);

    const VU16 raw0 = BitCast(d, LoadU(d, packed_in + 0 * N));

    const VU16 raw1 = BitCast(d, LoadU(d, packed_in + 1 * N));

    const VU16 raw2 = BitCast(d, LoadU(d, packed_in + 2 * N));

    const VU16 raw3 = BitCast(d, LoadU(d, packed_in + 3 * N));

    const VU16 raw4 = BitCast(d, LoadU(d, packed_in + 4 * N));

    const VU16 raw5 = BitCast(d, LoadU(d, packed_in + 5 * N));

    const VU16 raw6 = BitCast(d, LoadU(d, packed_in + 6 * N));

    const VU16 raw7 = BitCast(d, LoadU(d, packed_in + 7 * N));

    const VU16 raw8 = BitCast(d, LoadU(d, packed_in + 8 * N));

    const VU16 raw9 = BitCast(d, LoadU(d, packed_in + 9 * N));

    const VU16 rawA = BitCast(d, LoadU(d, packed_in + 0xA * N));

    const VU16 rawB = BitCast(d, LoadU(d, packed_in + 0xB * N));

    const VU16 rawC = BitCast(d, LoadU(d, packed_in + 0xC * N));

    const VU16 rawD = BitCast(d, LoadU(d, packed_in + 0xD * N));

    const VU16 rawE = BitCast(d, LoadU(d, packed_in + 0xE * N));

    const VU16 rawF = BitCast(d, LoadU(d, packed_in + 0xF * N));

    StoreU(raw0, d, raw + 0 * N);

    StoreU(raw1, d, raw + 1 * N);

    StoreU(raw2, d, raw + 2 * N);

    StoreU(raw3, d, raw + 3 * N);

    StoreU(raw4, d, raw + 4 * N);

    StoreU(raw5, d, raw + 5 * N);

    StoreU(raw6, d, raw + 6 * N);

    StoreU(raw7, d, raw + 7 * N);

    StoreU(raw8, d, raw + 8 * N);

    StoreU(raw9, d, raw + 9 * N);

    StoreU(rawA, d, raw + 0xA * N);

    StoreU(rawB, d, raw + 0xB * N);

    StoreU(rawC, d, raw + 0xC * N);

    StoreU(rawD, d, raw + 0xD * N);

    StoreU(rawE, d, raw + 0xE * N);

    StoreU(rawF, d, raw + 0xF * N);

};  // Pack16<16>

// NOLINTNEXTLINE(google-readability-namespace-comments)

}  // namespace HWY_NAMESPACE

}  // namespace hwy

HWY_AFTER_NAMESPACE();

#endif  // HIGHWAY_HWY_CONTRIB_BIT_PACK_INL_H_

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