// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008-2016 Konstantinos Margaritis <markos@freevec.org>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef EIGEN_PACKET_MATH_ALTIVEC_H
#define EIGEN_PACKET_MATH_ALTIVEC_H

// IWYU pragma: private
#include "../../InternalHeaderCheck.h"

namespace Eigen {

namespace internal {

#ifndef EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD
#define EIGEN_CACHEFRIENDLY_PRODUCT_THRESHOLD 4
#endif

#ifndef EIGEN_HAS_SINGLE_INSTRUCTION_MADD
#define EIGEN_HAS_SINGLE_INSTRUCTION_MADD
#endif

// NOTE Altivec has 32 registers, but Eigen only accepts a value of 8 or 16
#ifndef EIGEN_ARCH_DEFAULT_NUMBER_OF_REGISTERS
#define EIGEN_ARCH_DEFAULT_NUMBER_OF_REGISTERS 32
#endif

typedef __vector float Packet4f;
typedef __vector int Packet4i;
typedef __vector unsigned int Packet4ui;
typedef __vector __bool int Packet4bi;
typedef __vector short int Packet8s;
typedef __vector unsigned short int Packet8us;
typedef __vector __bool short Packet8bi;
typedef __vector signed char Packet16c;
typedef __vector unsigned char Packet16uc;
typedef eigen_packet_wrapper<__vector unsigned short int, 0> Packet8bf;

// We don't want to write the same code all the time, but we need to reuse the constants
// and it doesn't really work to declare them global, so we define macros instead
#define EIGEN_DECLARE_CONST_FAST_Packet4f(NAME, X) Packet4f p4f_##NAME = {X, X, X, X}

#define EIGEN_DECLARE_CONST_FAST_Packet4i(NAME, X) Packet4i p4i_##NAME = vec_splat_s32(X)

#define EIGEN_DECLARE_CONST_FAST_Packet4ui(NAME, X) Packet4ui p4ui_##NAME = {X, X, X, X}

#define EIGEN_DECLARE_CONST_FAST_Packet8us(NAME, X) Packet8us p8us_##NAME = {X, X, X, X, X, X, X, X}

#define EIGEN_DECLARE_CONST_FAST_Packet16uc(NAME, X) \
  Packet16uc p16uc_##NAME = {X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, X}

#define EIGEN_DECLARE_CONST_Packet4f(NAME, X) Packet4f p4f_##NAME = pset1<Packet4f>(X)

#define EIGEN_DECLARE_CONST_Packet4i(NAME, X) Packet4i p4i_##NAME = pset1<Packet4i>(X)

#define EIGEN_DECLARE_CONST_Packet2d(NAME, X) Packet2d p2d_##NAME = pset1<Packet2d>(X)

#define EIGEN_DECLARE_CONST_Packet2l(NAME, X) Packet2l p2l_##NAME = pset1<Packet2l>(X)

#define EIGEN_DECLARE_CONST_Packet4f_FROM_INT(NAME, X) \
  const Packet4f p4f_##NAME = reinterpret_cast<Packet4f>(pset1<Packet4i>(X))

#define DST_CHAN 1
#define DST_CTRL(size, count, stride) (((size) << 24) | ((count) << 16) | (stride))
#define __UNPACK_TYPE__(PACKETNAME) typename unpacket_traits<PACKETNAME>::type

// These constants are endian-agnostic
static EIGEN_DECLARE_CONST_FAST_Packet4f(ZERO, 0);       //{ 0.0, 0.0, 0.0, 0.0}
static EIGEN_DECLARE_CONST_FAST_Packet4i(ZERO, 0);       //{ 0, 0, 0, 0,}
static EIGEN_DECLARE_CONST_FAST_Packet4i(ONE, 1);        //{ 1, 1, 1, 1}
static EIGEN_DECLARE_CONST_FAST_Packet4i(MINUS16, -16);  //{ -16, -16, -16, -16}
static EIGEN_DECLARE_CONST_FAST_Packet4i(MINUS1, -1);    //{ -1, -1, -1, -1}
static EIGEN_DECLARE_CONST_FAST_Packet4ui(SIGN, 0x80000000u);
static EIGEN_DECLARE_CONST_FAST_Packet4ui(PREV0DOT5, 0x3EFFFFFFu);
static EIGEN_DECLARE_CONST_FAST_Packet8us(ONE, 1);  //{ 1, 1, 1, 1, 1, 1, 1, 1}
static Packet4f p4f_MZERO =
    (Packet4f)vec_sl((Packet4ui)p4i_MINUS1, (Packet4ui)p4i_MINUS1);  //{ 0x80000000, 0x80000000, 0x80000000, 0x80000000}
#ifndef __VSX__
static Packet4f p4f_ONE = vec_ctf(p4i_ONE, 0);  //{ 1.0, 1.0, 1.0, 1.0}
#endif

static Packet4f p4f_COUNTDOWN = {0.0, 1.0, 2.0, 3.0};
static Packet4i p4i_COUNTDOWN = {0, 1, 2, 3};
static Packet8s p8s_COUNTDOWN = {0, 1, 2, 3, 4, 5, 6, 7};
static Packet8us p8us_COUNTDOWN = {0, 1, 2, 3, 4, 5, 6, 7};

static Packet16c p16c_COUNTDOWN = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
static Packet16uc p16uc_COUNTDOWN = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};

static Packet16uc p16uc_REVERSE32 = {12, 13, 14, 15, 8, 9, 10, 11, 4, 5, 6, 7, 0, 1, 2, 3};
static Packet16uc p16uc_REVERSE16 = {14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 0, 1};
static Packet16uc p16uc_REVERSE8 = {15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0};

#ifdef _BIG_ENDIAN
static Packet16uc p16uc_DUPLICATE32_HI = {0, 1, 2, 3, 0, 1, 2, 3, 4, 5, 6, 7, 4, 5, 6, 7};
#endif
static const Packet16uc p16uc_DUPLICATE16_EVEN = {0, 1, 0, 1, 4, 5, 4, 5, 8, 9, 8, 9, 12, 13, 12, 13};
static const Packet16uc p16uc_DUPLICATE16_ODD = {2, 3, 2, 3, 6, 7, 6, 7, 10, 11, 10, 11, 14, 15, 14, 15};

static Packet16uc p16uc_QUADRUPLICATE16_HI = {0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3};
static Packet16uc p16uc_QUADRUPLICATE16 = {0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3};

static Packet16uc p16uc_MERGEE16 = {0, 1, 16, 17, 4, 5, 20, 21, 8, 9, 24, 25, 12, 13, 28, 29};
static Packet16uc p16uc_MERGEO16 = {2, 3, 18, 19, 6, 7, 22, 23, 10, 11, 26, 27, 14, 15, 30, 31};
#ifdef _BIG_ENDIAN
static Packet16uc p16uc_MERGEH16 = {0, 1, 4, 5, 8, 9, 12, 13, 16, 17, 20, 21, 24, 25, 28, 29};
#else
static Packet16uc p16uc_MERGEL16 = {2, 3, 6, 7, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31};
#endif

// Handle endianness properly while loading constants
// Define global static constants:
#ifdef _BIG_ENDIAN
static Packet16uc p16uc_FORWARD = vec_lvsl(0, (float*)0);
static Packet16uc p16uc_PSET32_WODD =
    vec_sld((Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 0), (Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 2),
            8);  //{ 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 };
static Packet16uc p16uc_PSET32_WEVEN = vec_sld(p16uc_DUPLICATE32_HI, (Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 3),
                                               8);  //{ 4,5,6,7, 4,5,6,7, 12,13,14,15, 12,13,14,15 };
static Packet16uc p16uc_HALF64_0_16 = vec_sld((Packet16uc)p4i_ZERO, vec_splat((Packet16uc)vec_abs(p4i_MINUS16), 3),
                                              8);  //{ 0,0,0,0, 0,0,0,0, 16,16,16,16, 16,16,16,16};
#else
static Packet16uc p16uc_FORWARD = p16uc_REVERSE32;
static Packet16uc p16uc_PSET32_WODD =
    vec_sld((Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 1), (Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 3),
            8);  //{ 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 };
static Packet16uc p16uc_PSET32_WEVEN =
    vec_sld((Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 0), (Packet16uc)vec_splat((Packet4ui)p16uc_FORWARD, 2),
            8);  //{ 4,5,6,7, 4,5,6,7, 12,13,14,15, 12,13,14,15 };
static Packet16uc p16uc_HALF64_0_16 = vec_sld(vec_splat((Packet16uc)vec_abs(p4i_MINUS16), 0), (Packet16uc)p4i_ZERO,
                                              8);  //{ 0,0,0,0, 0,0,0,0, 16,16,16,16, 16,16,16,16};
#endif  // _BIG_ENDIAN

static Packet16uc p16uc_PSET64_HI = (Packet16uc)vec_mergeh(
    (Packet4ui)p16uc_PSET32_WODD, (Packet4ui)p16uc_PSET32_WEVEN);  //{ 0,1,2,3, 4,5,6,7, 0,1,2,3, 4,5,6,7 };
static Packet16uc p16uc_PSET64_LO = (Packet16uc)vec_mergel(
    (Packet4ui)p16uc_PSET32_WODD, (Packet4ui)p16uc_PSET32_WEVEN);  //{ 8,9,10,11, 12,13,14,15, 8,9,10,11, 12,13,14,15 };
static Packet16uc p16uc_TRANSPOSE64_HI =
    p16uc_PSET64_HI + p16uc_HALF64_0_16;  //{ 0,1,2,3, 4,5,6,7, 16,17,18,19, 20,21,22,23};
static Packet16uc p16uc_TRANSPOSE64_LO =
    p16uc_PSET64_LO + p16uc_HALF64_0_16;  //{ 8,9,10,11, 12,13,14,15, 24,25,26,27, 28,29,30,31};

static Packet16uc p16uc_COMPLEX32_REV =
    vec_sld(p16uc_REVERSE32, p16uc_REVERSE32, 8);  //{ 4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11 };

#if EIGEN_HAS_BUILTIN(__builtin_prefetch) || EIGEN_COMP_GNUC
#define EIGEN_PPC_PREFETCH(ADDR) __builtin_prefetch(ADDR);
#else
#define EIGEN_PPC_PREFETCH(ADDR) asm("   dcbt [%[addr]]\n" ::[addr] "r"(ADDR) : "cc");
#endif

#if EIGEN_COMP_LLVM
#define LOAD_STORE_UNROLL_16 _Pragma("unroll 16")
#else
#define LOAD_STORE_UNROLL_16 _Pragma("GCC unroll(16)")
#endif

template <>
struct packet_traits<float> : default_packet_traits {
  typedef Packet4f type;
  typedef Packet4f half;
  enum {
    Vectorizable = 1,
    AlignedOnScalar = 1,
    size = 4,

    HasAdd = 1,
    HasSub = 1,
    HasMul = 1,
    HasDiv = 1,
    HasMin = 1,
    HasMax = 1,
    HasAbs = 1,
    HasSin = EIGEN_FAST_MATH,
    HasCos = EIGEN_FAST_MATH,
    HasACos = 1,
    HasASin = 1,
    HasATan = 1,
    HasATanh = 1,
    HasLog = 1,
    HasExp = 1,
#ifdef EIGEN_VECTORIZE_VSX
    HasSqrt = 1,
#if !EIGEN_COMP_CLANG
    HasRsqrt = 1,
#else
    HasRsqrt = 0,
#endif
    HasTanh = EIGEN_FAST_MATH,
    HasErf = EIGEN_FAST_MATH,
    HasErfc = EIGEN_FAST_MATH,
#else
    HasSqrt = 0,
    HasRsqrt = 0,
    HasTanh = 0,
    HasErf = 0,
#endif
    HasNegate = 1,
    HasBlend = 1
  };
};
template <>
struct packet_traits<bfloat16> : default_packet_traits {
  typedef Packet8bf type;
  typedef Packet8bf half;
  enum {
    Vectorizable = 1,
    AlignedOnScalar = 1,
    size = 8,

    HasAdd = 1,
    HasSub = 1,
    HasMul = 1,
    HasDiv = 1,
    HasMin = 1,
    HasMax = 1,
    HasAbs = 1,
    HasSin = EIGEN_FAST_MATH,
    HasCos = EIGEN_FAST_MATH,
    HasLog = 1,
    HasExp = 1,
#ifdef EIGEN_VECTORIZE_VSX
    HasSqrt = 1,
#if !EIGEN_COMP_CLANG
    HasRsqrt = 1,
#else
    HasRsqrt = 0,
#endif
#else
    HasSqrt = 0,
    HasRsqrt = 0,
#endif
    HasTanh = 0,
    HasErf = 0,
    HasNegate = 1,
    HasBlend = 1
  };
};

template <>
struct packet_traits<int> : default_packet_traits {
  typedef Packet4i type;
  typedef Packet4i half;
  enum {
    Vectorizable = 1,
    AlignedOnScalar = 1,
    size = 4,

    HasAdd = 1,
    HasSub = 1,
    HasShift = 1,
    HasMul = 1,
#if defined(_ARCH_PWR10) && (EIGEN_COMP_LLVM || EIGEN_GNUC_STRICT_AT_LEAST(11, 0, 0))
    HasDiv = 1,
#else
    HasDiv = 0,
#endif
    HasBlend = 1,
    HasCmp = 1
  };
};

template <>
struct packet_traits<short int> : default_packet_traits {
  typedef Packet8s type;
  typedef Packet8s half;
  enum {
    Vectorizable = 1,
    AlignedOnScalar = 1,
    size = 8,

    HasAdd = 1,
    HasSub = 1,
    HasMul = 1,
    HasDiv = 0,
    HasBlend = 1,
    HasCmp = 1
  };
};

template <>
struct packet_traits<unsigned short int> : default_packet_traits {
  typedef Packet8us type;
  typedef Packet8us half;
  enum {
    Vectorizable = 1,
    AlignedOnScalar = 1,
    size = 8,

    HasAdd = 1,
    HasSub = 1,
    HasMul = 1,
    HasDiv = 0,
    HasBlend = 1,
    HasCmp = 1
  };
};

template <>
struct packet_traits<signed char> : default_packet_traits {
  typedef Packet16c type;
  typedef Packet16c half;
  enum {
    Vectorizable = 1,
    AlignedOnScalar = 1,
    size = 16,

    HasAdd = 1,
    HasSub = 1,
    HasMul = 1,
    HasDiv = 0,
    HasBlend = 1,
    HasCmp = 1
  };
};

template <>
struct packet_traits<unsigned char> : default_packet_traits {
  typedef Packet16uc type;
  typedef Packet16uc half;
  enum {
    Vectorizable = 1,
    AlignedOnScalar = 1,
    size = 16,

    HasAdd = 1,
    HasSub = 1,
    HasMul = 1,
    HasDiv = 0,
    HasBlend = 1,
    HasCmp = 1
  };
};

template <>
struct unpacket_traits<Packet4f> {
  typedef float type;
  typedef Packet4f half;
  typedef Packet4i integer_packet;
  enum {
    size = 4,
    alignment = Aligned16,
    vectorizable = true,
    masked_load_available = false,
    masked_store_available = false
  };
};
template <>
struct unpacket_traits<Packet4i> {
  typedef int type;
  typedef Packet4i half;
  enum {
    size = 4,
    alignment = Aligned16,
    vectorizable = true,
    masked_load_available = false,
    masked_store_available = false
  };
};
template <>
struct unpacket_traits<Packet8s> {
  typedef short int type;
  typedef Packet8s half;
  enum {
    size = 8,
    alignment = Aligned16,
    vectorizable = true,
    masked_load_available = false,
    masked_store_available = false
  };
};
template <>
struct unpacket_traits<Packet8us> {
  typedef unsigned short int type;
  typedef Packet8us half;
  enum {
    size = 8,
    alignment = Aligned16,
    vectorizable = true,
    masked_load_available = false,
    masked_store_available = false
  };
};

template <>
struct unpacket_traits<Packet16c> {
  typedef signed char type;
  typedef Packet16c half;
  enum {
    size = 16,
    alignment = Aligned16,
    vectorizable = true,
    masked_load_available = false,
    masked_store_available = false
  };
};
template <>
struct unpacket_traits<Packet16uc> {
  typedef unsigned char type;
  typedef Packet16uc half;
  enum {
    size = 16,
    alignment = Aligned16,
    vectorizable = true,
    masked_load_available = false,
    masked_store_available = false
  };
};

template <>
struct unpacket_traits<Packet8bf> {
  typedef bfloat16 type;
  typedef Packet8bf half;
  enum {
    size = 8,
    alignment = Aligned16,
    vectorizable = true,
    masked_load_available = false,
    masked_store_available = false
  };
};
inline std::ostream& operator<<(std::ostream& s, const Packet16c& v) {
  union {
    Packet16c v;
    signed char n[16];
  } vt;
  vt.v = v;
  for (int i = 0; i < 16; i++) s << vt.n[i] << ", ";
  return s;
}

inline std::ostream& operator<<(std::ostream& s, const Packet16uc& v) {
  union {
    Packet16uc v;
    unsigned char n[16];
  } vt;
  vt.v = v;
  for (int i = 0; i < 16; i++) s << vt.n[i] << ", ";
  return s;
}

inline std::ostream& operator<<(std::ostream& s, const Packet4f& v) {
  union {
    Packet4f v;
    float n[4];
  } vt;
  vt.v = v;
  s << vt.n[0] << ", " << vt.n[1] << ", " << vt.n[2] << ", " << vt.n[3];
  return s;
}

inline std::ostream& operator<<(std::ostream& s, const Packet4i& v) {
  union {
    Packet4i v;
    int n[4];
  } vt;
  vt.v = v;
  s << vt.n[0] << ", " << vt.n[1] << ", " << vt.n[2] << ", " << vt.n[3];
  return s;
}

inline std::ostream& operator<<(std::ostream& s, const Packet4ui& v) {
  union {
    Packet4ui v;
    unsigned int n[4];
  } vt;
  vt.v = v;
  s << vt.n[0] << ", " << vt.n[1] << ", " << vt.n[2] << ", " << vt.n[3];
  return s;
}

template <typename Packet>
EIGEN_STRONG_INLINE Packet pload_common(const __UNPACK_TYPE__(Packet) * from) {
  // some versions of GCC throw "unused-but-set-parameter".
  // ignoring these warnings for now.
  EIGEN_UNUSED_VARIABLE(from);
  EIGEN_DEBUG_ALIGNED_LOAD
#ifdef EIGEN_VECTORIZE_VSX
  return vec_xl(0, const_cast<__UNPACK_TYPE__(Packet)*>(from));
#else
  return vec_ld(0, from);
#endif
}

// Need to define them first or we get specialization after instantiation errors
template <>
EIGEN_STRONG_INLINE Packet4f pload<Packet4f>(const float* from) {
  return pload_common<Packet4f>(from);
}

template <>
EIGEN_STRONG_INLINE Packet4i pload<Packet4i>(const int* from) {
  return pload_common<Packet4i>(from);
}

template <>
EIGEN_STRONG_INLINE Packet8s pload<Packet8s>(const short int* from) {
  return pload_common<Packet8s>(from);
}

template <>
EIGEN_STRONG_INLINE Packet8us pload<Packet8us>(const unsigned short int* from) {
  return pload_common<Packet8us>(from);
}

template <>
EIGEN_STRONG_INLINE Packet16c pload<Packet16c>(const signed char* from) {
  return pload_common<Packet16c>(from);
}

template <>
EIGEN_STRONG_INLINE Packet16uc pload<Packet16uc>(const unsigned char* from) {
  return pload_common<Packet16uc>(from);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pload<Packet8bf>(const bfloat16* from) {
  return pload_common<Packet8us>(reinterpret_cast<const unsigned short int*>(from));
}

template <typename Packet>
EIGEN_ALWAYS_INLINE Packet pload_ignore(const __UNPACK_TYPE__(Packet) * from) {
  // some versions of GCC throw "unused-but-set-parameter".
  // ignoring these warnings for now.
  EIGEN_UNUSED_VARIABLE(from);
  EIGEN_DEBUG_ALIGNED_LOAD
  // Ignore partial input memory initialized
#if !EIGEN_COMP_LLVM
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
#ifdef EIGEN_VECTORIZE_VSX
  return vec_xl(0, const_cast<__UNPACK_TYPE__(Packet)*>(from));
#else
  return vec_ld(0, from);
#endif
#if !EIGEN_COMP_LLVM
#pragma GCC diagnostic pop
#endif
}

template <>
EIGEN_ALWAYS_INLINE Packet8bf pload_ignore<Packet8bf>(const bfloat16* from) {
  return pload_ignore<Packet8us>(reinterpret_cast<const unsigned short int*>(from));
}

template <typename Packet>
EIGEN_ALWAYS_INLINE Packet pload_partial_common(const __UNPACK_TYPE__(Packet) * from, const Index n,
                                                const Index offset) {
  // some versions of GCC throw "unused-but-set-parameter".
  // ignoring these warnings for now.
  const Index packet_size = unpacket_traits<Packet>::size;
  eigen_internal_assert(n + offset <= packet_size && "number of elements plus offset will read past end of packet");
  const Index size = sizeof(__UNPACK_TYPE__(Packet));
#ifdef _ARCH_PWR9
  EIGEN_UNUSED_VARIABLE(packet_size);
  EIGEN_DEBUG_ALIGNED_LOAD
  EIGEN_UNUSED_VARIABLE(from);
  Packet load = vec_xl_len(const_cast<__UNPACK_TYPE__(Packet)*>(from), n * size);
  if (offset) {
    Packet16uc shift = pset1<Packet16uc>(offset * 8 * size);
#ifdef _BIG_ENDIAN
    load = Packet(vec_sro(Packet16uc(load), shift));
#else
    load = Packet(vec_slo(Packet16uc(load), shift));
#endif
  }
  return load;
#else
  if (n) {
    EIGEN_ALIGN16 __UNPACK_TYPE__(Packet) load[packet_size];
    unsigned char* load2 = reinterpret_cast<unsigned char*>(load + offset);
    unsigned char* from2 = reinterpret_cast<unsigned char*>(const_cast<__UNPACK_TYPE__(Packet)*>(from));
    Index n2 = n * size;
    if (16 <= n2) {
      pstoreu(load2, ploadu<Packet16uc>(from2));
    } else {
      memcpy((void*)load2, (void*)from2, n2);
    }
    return pload_ignore<Packet>(load);
  } else {
    return Packet(pset1<Packet16uc>(0));
  }
#endif
}

template <>
EIGEN_ALWAYS_INLINE Packet4f pload_partial<Packet4f>(const float* from, const Index n, const Index offset) {
  return pload_partial_common<Packet4f>(from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE Packet4i pload_partial<Packet4i>(const int* from, const Index n, const Index offset) {
  return pload_partial_common<Packet4i>(from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE Packet8s pload_partial<Packet8s>(const short int* from, const Index n, const Index offset) {
  return pload_partial_common<Packet8s>(from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE Packet8us pload_partial<Packet8us>(const unsigned short int* from, const Index n,
                                                       const Index offset) {
  return pload_partial_common<Packet8us>(from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE Packet8bf pload_partial<Packet8bf>(const bfloat16* from, const Index n, const Index offset) {
  return pload_partial_common<Packet8us>(reinterpret_cast<const unsigned short int*>(from), n, offset);
}

template <>
EIGEN_ALWAYS_INLINE Packet16c pload_partial<Packet16c>(const signed char* from, const Index n, const Index offset) {
  return pload_partial_common<Packet16c>(from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE Packet16uc pload_partial<Packet16uc>(const unsigned char* from, const Index n, const Index offset) {
  return pload_partial_common<Packet16uc>(from, n, offset);
}

template <typename Packet>
EIGEN_STRONG_INLINE void pstore_common(__UNPACK_TYPE__(Packet) * to, const Packet& from) {
  // some versions of GCC throw "unused-but-set-parameter" (float *to).
  // ignoring these warnings for now.
  EIGEN_UNUSED_VARIABLE(to);
  EIGEN_DEBUG_ALIGNED_STORE
#ifdef EIGEN_VECTORIZE_VSX
  vec_xst(from, 0, to);
#else
  vec_st(from, 0, to);
#endif
}

template <>
EIGEN_STRONG_INLINE void pstore<float>(float* to, const Packet4f& from) {
  pstore_common<Packet4f>(to, from);
}

template <>
EIGEN_STRONG_INLINE void pstore<int>(int* to, const Packet4i& from) {
  pstore_common<Packet4i>(to, from);
}

template <>
EIGEN_STRONG_INLINE void pstore<short int>(short int* to, const Packet8s& from) {
  pstore_common<Packet8s>(to, from);
}

template <>
EIGEN_STRONG_INLINE void pstore<unsigned short int>(unsigned short int* to, const Packet8us& from) {
  pstore_common<Packet8us>(to, from);
}

template <>
EIGEN_STRONG_INLINE void pstore<bfloat16>(bfloat16* to, const Packet8bf& from) {
  pstore_common<Packet8us>(reinterpret_cast<unsigned short int*>(to), from.m_val);
}

template <>
EIGEN_STRONG_INLINE void pstore<signed char>(signed char* to, const Packet16c& from) {
  pstore_common<Packet16c>(to, from);
}

template <>
EIGEN_STRONG_INLINE void pstore<unsigned char>(unsigned char* to, const Packet16uc& from) {
  pstore_common<Packet16uc>(to, from);
}

template <typename Packet>
EIGEN_ALWAYS_INLINE void pstore_partial_common(__UNPACK_TYPE__(Packet) * to, const Packet& from, const Index n,
                                               const Index offset) {
  // some versions of GCC throw "unused-but-set-parameter" (float *to).
  // ignoring these warnings for now.
  const Index packet_size = unpacket_traits<Packet>::size;
  eigen_internal_assert(n + offset <= packet_size && "number of elements plus offset will write past end of packet");
  const Index size = sizeof(__UNPACK_TYPE__(Packet));
#ifdef _ARCH_PWR9
  EIGEN_UNUSED_VARIABLE(packet_size);
  EIGEN_UNUSED_VARIABLE(to);
  EIGEN_DEBUG_ALIGNED_STORE
  Packet store = from;
  if (offset) {
    Packet16uc shift = pset1<Packet16uc>(offset * 8 * size);
#ifdef _BIG_ENDIAN
    store = Packet(vec_slo(Packet16uc(store), shift));
#else
    store = Packet(vec_sro(Packet16uc(store), shift));
#endif
  }
  vec_xst_len(store, to, n * size);
#else
  if (n) {
    EIGEN_ALIGN16 __UNPACK_TYPE__(Packet) store[packet_size];
    pstore(store, from);
    unsigned char* store2 = reinterpret_cast<unsigned char*>(store + offset);
    unsigned char* to2 = reinterpret_cast<unsigned char*>(to);
    Index n2 = n * size;
    if (16 <= n2) {
      pstore(to2, ploadu<Packet16uc>(store2));
    } else {
      memcpy((void*)to2, (void*)store2, n2);
    }
  }
#endif
}

template <>
EIGEN_ALWAYS_INLINE void pstore_partial<float>(float* to, const Packet4f& from, const Index n, const Index offset) {
  pstore_partial_common<Packet4f>(to, from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE void pstore_partial<int>(int* to, const Packet4i& from, const Index n, const Index offset) {
  pstore_partial_common<Packet4i>(to, from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE void pstore_partial<short int>(short int* to, const Packet8s& from, const Index n,
                                                   const Index offset) {
  pstore_partial_common<Packet8s>(to, from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE void pstore_partial<unsigned short int>(unsigned short int* to, const Packet8us& from,
                                                            const Index n, const Index offset) {
  pstore_partial_common<Packet8us>(to, from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE void pstore_partial<bfloat16>(bfloat16* to, const Packet8bf& from, const Index n,
                                                  const Index offset) {
  pstore_partial_common<Packet8us>(reinterpret_cast<unsigned short int*>(to), from.m_val, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE void pstore_partial<signed char>(signed char* to, const Packet16c& from, const Index n,
                                                     const Index offset) {
  pstore_partial_common<Packet16c>(to, from, n, offset);
}

template <>
EIGEN_ALWAYS_INLINE void pstore_partial<unsigned char>(unsigned char* to, const Packet16uc& from, const Index n,
                                                       const Index offset) {
  pstore_partial_common<Packet16uc>(to, from, n, offset);
}

template <typename Packet>
EIGEN_STRONG_INLINE Packet pset1_size4(const __UNPACK_TYPE__(Packet) & from) {
  Packet v = {from, from, from, from};
  return v;
}

template <typename Packet>
EIGEN_STRONG_INLINE Packet pset1_size8(const __UNPACK_TYPE__(Packet) & from) {
  Packet v = {from, from, from, from, from, from, from, from};
  return v;
}

template <typename Packet>
EIGEN_STRONG_INLINE Packet pset1_size16(const __UNPACK_TYPE__(Packet) & from) {
  Packet v = {from, from, from, from, from, from, from, from, from, from, from, from, from, from, from, from};
  return v;
}

template <>
EIGEN_STRONG_INLINE Packet4f pset1<Packet4f>(const float& from) {
  return pset1_size4<Packet4f>(from);
}

template <>
EIGEN_STRONG_INLINE Packet4i pset1<Packet4i>(const int& from) {
  return pset1_size4<Packet4i>(from);
}

template <>
EIGEN_STRONG_INLINE Packet8s pset1<Packet8s>(const short int& from) {
  return pset1_size8<Packet8s>(from);
}

template <>
EIGEN_STRONG_INLINE Packet8us pset1<Packet8us>(const unsigned short int& from) {
  return pset1_size8<Packet8us>(from);
}

template <>
EIGEN_STRONG_INLINE Packet16c pset1<Packet16c>(const signed char& from) {
  return pset1_size16<Packet16c>(from);
}

template <>
EIGEN_STRONG_INLINE Packet16uc pset1<Packet16uc>(const unsigned char& from) {
  return pset1_size16<Packet16uc>(from);
}

template <>
EIGEN_STRONG_INLINE Packet4f pset1frombits<Packet4f>(unsigned int from) {
  return reinterpret_cast<Packet4f>(pset1<Packet4i>(from));
}

template <>
EIGEN_STRONG_INLINE Packet8bf pset1<Packet8bf>(const bfloat16& from) {
  return pset1_size8<Packet8us>(reinterpret_cast<const unsigned short int&>(from));
}

template <typename Packet>
EIGEN_STRONG_INLINE void pbroadcast4_common(const __UNPACK_TYPE__(Packet) * a, Packet& a0, Packet& a1, Packet& a2,
                                            Packet& a3) {
  a3 = pload<Packet>(a);
  a0 = vec_splat(a3, 0);
  a1 = vec_splat(a3, 1);
  a2 = vec_splat(a3, 2);
  a3 = vec_splat(a3, 3);
}

template <>
EIGEN_STRONG_INLINE void pbroadcast4<Packet4f>(const float* a, Packet4f& a0, Packet4f& a1, Packet4f& a2, Packet4f& a3) {
  pbroadcast4_common<Packet4f>(a, a0, a1, a2, a3);
}
template <>
EIGEN_STRONG_INLINE void pbroadcast4<Packet4i>(const int* a, Packet4i& a0, Packet4i& a1, Packet4i& a2, Packet4i& a3) {
  pbroadcast4_common<Packet4i>(a, a0, a1, a2, a3);
}

template <typename Packet>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet pgather_common(const __UNPACK_TYPE__(Packet) * from, Index stride,
                                                            const Index n = unpacket_traits<Packet>::size) {
  EIGEN_ALIGN16 __UNPACK_TYPE__(Packet) a[unpacket_traits<Packet>::size];
  eigen_internal_assert(n <= unpacket_traits<Packet>::size && "number of elements will gather past end of packet");
  if (stride == 1) {
    if (n == unpacket_traits<Packet>::size) {
      return ploadu<Packet>(from);
    } else {
      return ploadu_partial<Packet>(from, n);
    }
  } else {
    LOAD_STORE_UNROLL_16
    for (Index i = 0; i < n; i++) {
      a[i] = from[i * stride];
    }
    // Leave rest of the array uninitialized
    return pload_ignore<Packet>(a);
  }
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet4f pgather<float, Packet4f>(const float* from, Index stride) {
  return pgather_common<Packet4f>(from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet4i pgather<int, Packet4i>(const int* from, Index stride) {
  return pgather_common<Packet4i>(from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet8s pgather<short int, Packet8s>(const short int* from, Index stride) {
  return pgather_common<Packet8s>(from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet8us pgather<unsigned short int, Packet8us>(const unsigned short int* from,
                                                                                       Index stride) {
  return pgather_common<Packet8us>(from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet8bf pgather<bfloat16, Packet8bf>(const bfloat16* from, Index stride) {
  return pgather_common<Packet8bf>(from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet16c pgather<signed char, Packet16c>(const signed char* from, Index stride) {
  return pgather_common<Packet16c>(from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet16uc pgather<unsigned char, Packet16uc>(const unsigned char* from,
                                                                                    Index stride) {
  return pgather_common<Packet16uc>(from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet4f pgather_partial<float, Packet4f>(const float* from, Index stride,
                                                                                const Index n) {
  return pgather_common<Packet4f>(from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet4i pgather_partial<int, Packet4i>(const int* from, Index stride,
                                                                              const Index n) {
  return pgather_common<Packet4i>(from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet8s pgather_partial<short int, Packet8s>(const short int* from, Index stride,
                                                                                    const Index n) {
  return pgather_common<Packet8s>(from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet8us
pgather_partial<unsigned short int, Packet8us>(const unsigned short int* from, Index stride, const Index n) {
  return pgather_common<Packet8us>(from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet8bf pgather_partial<bfloat16, Packet8bf>(const bfloat16* from, Index stride,
                                                                                     const Index n) {
  return pgather_common<Packet8bf>(from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet16c pgather_partial<signed char, Packet16c>(const signed char* from,
                                                                                        Index stride, const Index n) {
  return pgather_common<Packet16c>(from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet16uc pgather_partial<unsigned char, Packet16uc>(const unsigned char* from,
                                                                                            Index stride,
                                                                                            const Index n) {
  return pgather_common<Packet16uc>(from, stride, n);
}

template <typename Packet>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter_common(__UNPACK_TYPE__(Packet) * to, const Packet& from,
                                                           Index stride,
                                                           const Index n = unpacket_traits<Packet>::size) {
  EIGEN_ALIGN16 __UNPACK_TYPE__(Packet) a[unpacket_traits<Packet>::size];
  eigen_internal_assert(n <= unpacket_traits<Packet>::size && "number of elements will scatter past end of packet");
  if (stride == 1) {
    if (n == unpacket_traits<Packet>::size) {
      return pstoreu(to, from);
    } else {
      return pstoreu_partial(to, from, n);
    }
  } else {
    pstore<__UNPACK_TYPE__(Packet)>(a, from);
    LOAD_STORE_UNROLL_16
    for (Index i = 0; i < n; i++) {
      to[i * stride] = a[i];
    }
  }
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter<float, Packet4f>(float* to, const Packet4f& from, Index stride) {
  pscatter_common<Packet4f>(to, from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter<int, Packet4i>(int* to, const Packet4i& from, Index stride) {
  pscatter_common<Packet4i>(to, from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter<short int, Packet8s>(short int* to, const Packet8s& from,
                                                                         Index stride) {
  pscatter_common<Packet8s>(to, from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter<unsigned short int, Packet8us>(unsigned short int* to,
                                                                                   const Packet8us& from,
                                                                                   Index stride) {
  pscatter_common<Packet8us>(to, from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter<bfloat16, Packet8bf>(bfloat16* to, const Packet8bf& from,
                                                                         Index stride) {
  pscatter_common<Packet8bf>(to, from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter<signed char, Packet16c>(signed char* to, const Packet16c& from,
                                                                            Index stride) {
  pscatter_common<Packet16c>(to, from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter<unsigned char, Packet16uc>(unsigned char* to,
                                                                               const Packet16uc& from, Index stride) {
  pscatter_common<Packet16uc>(to, from, stride);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter_partial<float, Packet4f>(float* to, const Packet4f& from,
                                                                             Index stride, const Index n) {
  pscatter_common<Packet4f>(to, from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter_partial<int, Packet4i>(int* to, const Packet4i& from, Index stride,
                                                                           const Index n) {
  pscatter_common<Packet4i>(to, from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter_partial<short int, Packet8s>(short int* to, const Packet8s& from,
                                                                                 Index stride, const Index n) {
  pscatter_common<Packet8s>(to, from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter_partial<unsigned short int, Packet8us>(unsigned short int* to,
                                                                                           const Packet8us& from,
                                                                                           Index stride,
                                                                                           const Index n) {
  pscatter_common<Packet8us>(to, from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter_partial<bfloat16, Packet8bf>(bfloat16* to, const Packet8bf& from,
                                                                                 Index stride, const Index n) {
  pscatter_common<Packet8bf>(to, from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter_partial<signed char, Packet16c>(signed char* to,
                                                                                    const Packet16c& from, Index stride,
                                                                                    const Index n) {
  pscatter_common<Packet16c>(to, from, stride, n);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter_partial<unsigned char, Packet16uc>(unsigned char* to,
                                                                                       const Packet16uc& from,
                                                                                       Index stride, const Index n) {
  pscatter_common<Packet16uc>(to, from, stride, n);
}

template <>
EIGEN_STRONG_INLINE Packet4f plset<Packet4f>(const float& a) {
  return pset1<Packet4f>(a) + p4f_COUNTDOWN;
}
template <>
EIGEN_STRONG_INLINE Packet4i plset<Packet4i>(const int& a) {
  return pset1<Packet4i>(a) + p4i_COUNTDOWN;
}
template <>
EIGEN_STRONG_INLINE Packet8s plset<Packet8s>(const short int& a) {
  return pset1<Packet8s>(a) + p8s_COUNTDOWN;
}
template <>
EIGEN_STRONG_INLINE Packet8us plset<Packet8us>(const unsigned short int& a) {
  return pset1<Packet8us>(a) + p8us_COUNTDOWN;
}
template <>
EIGEN_STRONG_INLINE Packet16c plset<Packet16c>(const signed char& a) {
  return pset1<Packet16c>(a) + p16c_COUNTDOWN;
}
template <>
EIGEN_STRONG_INLINE Packet16uc plset<Packet16uc>(const unsigned char& a) {
  return pset1<Packet16uc>(a) + p16uc_COUNTDOWN;
}

template <>
EIGEN_STRONG_INLINE Packet4f padd<Packet4f>(const Packet4f& a, const Packet4f& b) {
  return a + b;
}
template <>
EIGEN_STRONG_INLINE Packet4i padd<Packet4i>(const Packet4i& a, const Packet4i& b) {
  return a + b;
}
template <>
EIGEN_STRONG_INLINE Packet4ui padd<Packet4ui>(const Packet4ui& a, const Packet4ui& b) {
  return a + b;
}
template <>
EIGEN_STRONG_INLINE Packet8s padd<Packet8s>(const Packet8s& a, const Packet8s& b) {
  return a + b;
}
template <>
EIGEN_STRONG_INLINE Packet8us padd<Packet8us>(const Packet8us& a, const Packet8us& b) {
  return a + b;
}
template <>
EIGEN_STRONG_INLINE Packet16c padd<Packet16c>(const Packet16c& a, const Packet16c& b) {
  return a + b;
}
template <>
EIGEN_STRONG_INLINE Packet16uc padd<Packet16uc>(const Packet16uc& a, const Packet16uc& b) {
  return a + b;
}

template <>
EIGEN_STRONG_INLINE Packet4f psub<Packet4f>(const Packet4f& a, const Packet4f& b) {
  return a - b;
}
template <>
EIGEN_STRONG_INLINE Packet4i psub<Packet4i>(const Packet4i& a, const Packet4i& b) {
  return a - b;
}
template <>
EIGEN_STRONG_INLINE Packet8s psub<Packet8s>(const Packet8s& a, const Packet8s& b) {
  return a - b;
}
template <>
EIGEN_STRONG_INLINE Packet8us psub<Packet8us>(const Packet8us& a, const Packet8us& b) {
  return a - b;
}
template <>
EIGEN_STRONG_INLINE Packet16c psub<Packet16c>(const Packet16c& a, const Packet16c& b) {
  return a - b;
}
template <>
EIGEN_STRONG_INLINE Packet16uc psub<Packet16uc>(const Packet16uc& a, const Packet16uc& b) {
  return a - b;
}

template <>
EIGEN_STRONG_INLINE Packet4f pnegate(const Packet4f& a) {
#ifdef __POWER8_VECTOR__
  return vec_neg(a);
#else
  return vec_xor(a, p4f_MZERO);
#endif
}
template <>
EIGEN_STRONG_INLINE Packet16c pnegate(const Packet16c& a) {
#ifdef __POWER8_VECTOR__
  return vec_neg(a);
#else
  return reinterpret_cast<Packet16c>(p4i_ZERO) - a;
#endif
}
template <>
EIGEN_STRONG_INLINE Packet8s pnegate(const Packet8s& a) {
#ifdef __POWER8_VECTOR__
  return vec_neg(a);
#else
  return reinterpret_cast<Packet8s>(p4i_ZERO) - a;
#endif
}
template <>
EIGEN_STRONG_INLINE Packet4i pnegate(const Packet4i& a) {
#ifdef __POWER8_VECTOR__
  return vec_neg(a);
#else
  return p4i_ZERO - a;
#endif
}

template <>
EIGEN_STRONG_INLINE Packet4f pconj(const Packet4f& a) {
  return a;
}
template <>
EIGEN_STRONG_INLINE Packet4i pconj(const Packet4i& a) {
  return a;
}

template <>
EIGEN_STRONG_INLINE Packet4f pmul<Packet4f>(const Packet4f& a, const Packet4f& b) {
  return vec_madd(a, b, p4f_MZERO);
}
template <>
EIGEN_STRONG_INLINE Packet4i pmul<Packet4i>(const Packet4i& a, const Packet4i& b) {
  return a * b;
}
template <>
EIGEN_STRONG_INLINE Packet8s pmul<Packet8s>(const Packet8s& a, const Packet8s& b) {
  return vec_mul(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8us pmul<Packet8us>(const Packet8us& a, const Packet8us& b) {
  return vec_mul(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet16c pmul<Packet16c>(const Packet16c& a, const Packet16c& b) {
  return vec_mul(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet16uc pmul<Packet16uc>(const Packet16uc& a, const Packet16uc& b) {
  return vec_mul(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet4f pdiv<Packet4f>(const Packet4f& a, const Packet4f& b) {
#ifndef __VSX__  // VSX actually provides a div instruction
  Packet4f t, y_0, y_1;

  // Altivec does not offer a divide instruction, we have to do a reciprocal approximation
  y_0 = vec_re(b);

  // Do one Newton-Raphson iteration to get the needed accuracy
  t = vec_nmsub(y_0, b, p4f_ONE);
  y_1 = vec_madd(y_0, t, y_0);

  return vec_madd(a, y_1, p4f_MZERO);
#else
  return vec_div(a, b);
#endif
}

template <>
EIGEN_STRONG_INLINE Packet4i pdiv<Packet4i>(const Packet4i& a, const Packet4i& b) {
#if defined(_ARCH_PWR10) && (EIGEN_COMP_LLVM || EIGEN_GNUC_STRICT_AT_LEAST(11, 0, 0))
  return vec_div(a, b);
#else
  EIGEN_UNUSED_VARIABLE(a);
  EIGEN_UNUSED_VARIABLE(b);
  eigen_assert(false && "packet integer division are not supported by AltiVec");
  return pset1<Packet4i>(0);
#endif
}

// for some weird raisons, it has to be overloaded for packet of integers
template <>
EIGEN_STRONG_INLINE Packet4f pmadd(const Packet4f& a, const Packet4f& b, const Packet4f& c) {
  return vec_madd(a, b, c);
}
template <>
EIGEN_STRONG_INLINE Packet4i pmadd(const Packet4i& a, const Packet4i& b, const Packet4i& c) {
  return a * b + c;
}
template <>
EIGEN_STRONG_INLINE Packet8s pmadd(const Packet8s& a, const Packet8s& b, const Packet8s& c) {
  return vec_madd(a, b, c);
}
template <>
EIGEN_STRONG_INLINE Packet8us pmadd(const Packet8us& a, const Packet8us& b, const Packet8us& c) {
  return vec_madd(a, b, c);
}

#ifdef EIGEN_VECTORIZE_VSX
template <>
EIGEN_STRONG_INLINE Packet4f pmsub(const Packet4f& a, const Packet4f& b, const Packet4f& c) {
  return vec_msub(a, b, c);
}
template <>
EIGEN_STRONG_INLINE Packet4f pnmadd(const Packet4f& a, const Packet4f& b, const Packet4f& c) {
  return vec_nmsub(a, b, c);
}
template <>
EIGEN_STRONG_INLINE Packet4f pnmsub(const Packet4f& a, const Packet4f& b, const Packet4f& c) {
  return vec_nmadd(a, b, c);
}
#endif

template <>
EIGEN_STRONG_INLINE Packet4f pmin<Packet4f>(const Packet4f& a, const Packet4f& b) {
#ifdef EIGEN_VECTORIZE_VSX
  // NOTE: about 10% slower than vec_min, but consistent with std::min and SSE regarding NaN
  Packet4f ret;
  __asm__("xvcmpgesp %x0,%x1,%x2\n\txxsel %x0,%x1,%x2,%x0" : "=&wa"(ret) : "wa"(a), "wa"(b));
  return ret;
#else
  return vec_min(a, b);
#endif
}
template <>
EIGEN_STRONG_INLINE Packet4i pmin<Packet4i>(const Packet4i& a, const Packet4i& b) {
  return vec_min(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8s pmin<Packet8s>(const Packet8s& a, const Packet8s& b) {
  return vec_min(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8us pmin<Packet8us>(const Packet8us& a, const Packet8us& b) {
  return vec_min(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet16c pmin<Packet16c>(const Packet16c& a, const Packet16c& b) {
  return vec_min(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet16uc pmin<Packet16uc>(const Packet16uc& a, const Packet16uc& b) {
  return vec_min(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet4f pmax<Packet4f>(const Packet4f& a, const Packet4f& b) {
#ifdef EIGEN_VECTORIZE_VSX
  // NOTE: about 10% slower than vec_max, but consistent with std::max and SSE regarding NaN
  Packet4f ret;
  __asm__("xvcmpgtsp %x0,%x2,%x1\n\txxsel %x0,%x1,%x2,%x0" : "=&wa"(ret) : "wa"(a), "wa"(b));
  return ret;
#else
  return vec_max(a, b);
#endif
}
template <>
EIGEN_STRONG_INLINE Packet4i pmax<Packet4i>(const Packet4i& a, const Packet4i& b) {
  return vec_max(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8s pmax<Packet8s>(const Packet8s& a, const Packet8s& b) {
  return vec_max(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8us pmax<Packet8us>(const Packet8us& a, const Packet8us& b) {
  return vec_max(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet16c pmax<Packet16c>(const Packet16c& a, const Packet16c& b) {
  return vec_max(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet16uc pmax<Packet16uc>(const Packet16uc& a, const Packet16uc& b) {
  return vec_max(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet4f pcmp_le(const Packet4f& a, const Packet4f& b) {
  return reinterpret_cast<Packet4f>(vec_cmple(a, b));
}
// To fix bug with vec_cmplt on older versions
#ifdef EIGEN_VECTORIZE_VSX
template <>
EIGEN_STRONG_INLINE Packet4f pcmp_lt(const Packet4f& a, const Packet4f& b) {
  return reinterpret_cast<Packet4f>(vec_cmplt(a, b));
}
#endif
template <>
EIGEN_STRONG_INLINE Packet4f pcmp_eq(const Packet4f& a, const Packet4f& b) {
  return reinterpret_cast<Packet4f>(vec_cmpeq(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet4f pcmp_lt_or_nan(const Packet4f& a, const Packet4f& b) {
  Packet4f c = reinterpret_cast<Packet4f>(vec_cmpge(a, b));
  return vec_nor(c, c);
}

#ifdef EIGEN_VECTORIZE_VSX
template <>
EIGEN_STRONG_INLINE Packet4i pcmp_le(const Packet4i& a, const Packet4i& b) {
  return reinterpret_cast<Packet4i>(vec_cmple(a, b));
}
#endif
template <>
EIGEN_STRONG_INLINE Packet4i pcmp_lt(const Packet4i& a, const Packet4i& b) {
  return reinterpret_cast<Packet4i>(vec_cmplt(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet4i pcmp_eq(const Packet4i& a, const Packet4i& b) {
  return reinterpret_cast<Packet4i>(vec_cmpeq(a, b));
}
#ifdef EIGEN_VECTORIZE_VSX
template <>
EIGEN_STRONG_INLINE Packet8s pcmp_le(const Packet8s& a, const Packet8s& b) {
  return reinterpret_cast<Packet8s>(vec_cmple(a, b));
}
#endif
template <>
EIGEN_STRONG_INLINE Packet8s pcmp_lt(const Packet8s& a, const Packet8s& b) {
  return reinterpret_cast<Packet8s>(vec_cmplt(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet8s pcmp_eq(const Packet8s& a, const Packet8s& b) {
  return reinterpret_cast<Packet8s>(vec_cmpeq(a, b));
}
#ifdef EIGEN_VECTORIZE_VSX
template <>
EIGEN_STRONG_INLINE Packet8us pcmp_le(const Packet8us& a, const Packet8us& b) {
  return reinterpret_cast<Packet8us>(vec_cmple(a, b));
}
#endif
template <>
EIGEN_STRONG_INLINE Packet8us pcmp_lt(const Packet8us& a, const Packet8us& b) {
  return reinterpret_cast<Packet8us>(vec_cmplt(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet8us pcmp_eq(const Packet8us& a, const Packet8us& b) {
  return reinterpret_cast<Packet8us>(vec_cmpeq(a, b));
}
#ifdef EIGEN_VECTORIZE_VSX
template <>
EIGEN_STRONG_INLINE Packet16c pcmp_le(const Packet16c& a, const Packet16c& b) {
  return reinterpret_cast<Packet16c>(vec_cmple(a, b));
}
#endif
template <>
EIGEN_STRONG_INLINE Packet16c pcmp_lt(const Packet16c& a, const Packet16c& b) {
  return reinterpret_cast<Packet16c>(vec_cmplt(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet16c pcmp_eq(const Packet16c& a, const Packet16c& b) {
  return reinterpret_cast<Packet16c>(vec_cmpeq(a, b));
}
#ifdef EIGEN_VECTORIZE_VSX
template <>
EIGEN_STRONG_INLINE Packet16uc pcmp_le(const Packet16uc& a, const Packet16uc& b) {
  return reinterpret_cast<Packet16uc>(vec_cmple(a, b));
}
#endif
template <>
EIGEN_STRONG_INLINE Packet16uc pcmp_lt(const Packet16uc& a, const Packet16uc& b) {
  return reinterpret_cast<Packet16uc>(vec_cmplt(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet16uc pcmp_eq(const Packet16uc& a, const Packet16uc& b) {
  return reinterpret_cast<Packet16uc>(vec_cmpeq(a, b));
}

template <>
EIGEN_STRONG_INLINE Packet4f pand<Packet4f>(const Packet4f& a, const Packet4f& b) {
  return vec_and(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet4i pand<Packet4i>(const Packet4i& a, const Packet4i& b) {
  return vec_and(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet4ui pand<Packet4ui>(const Packet4ui& a, const Packet4ui& b) {
  return vec_and(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8us pand<Packet8us>(const Packet8us& a, const Packet8us& b) {
  return vec_and(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pand<Packet8bf>(const Packet8bf& a, const Packet8bf& b) {
  return pand<Packet8us>(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet4f por<Packet4f>(const Packet4f& a, const Packet4f& b) {
  return vec_or(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet4i por<Packet4i>(const Packet4i& a, const Packet4i& b) {
  return vec_or(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8s por<Packet8s>(const Packet8s& a, const Packet8s& b) {
  return vec_or(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8us por<Packet8us>(const Packet8us& a, const Packet8us& b) {
  return vec_or(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8bf por<Packet8bf>(const Packet8bf& a, const Packet8bf& b) {
  return por<Packet8us>(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet4f pxor<Packet4f>(const Packet4f& a, const Packet4f& b) {
  return vec_xor(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet4i pxor<Packet4i>(const Packet4i& a, const Packet4i& b) {
  return vec_xor(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8us pxor<Packet8us>(const Packet8us& a, const Packet8us& b) {
  return vec_xor(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pxor<Packet8bf>(const Packet8bf& a, const Packet8bf& b) {
  return pxor<Packet8us>(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet4f pandnot<Packet4f>(const Packet4f& a, const Packet4f& b) {
  return vec_andc(a, b);
}
template <>
EIGEN_STRONG_INLINE Packet4i pandnot<Packet4i>(const Packet4i& a, const Packet4i& b) {
  return vec_andc(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet4f pselect(const Packet4f& mask, const Packet4f& a, const Packet4f& b) {
  return vec_sel(b, a, reinterpret_cast<Packet4ui>(mask));
}

template <>
EIGEN_STRONG_INLINE Packet4f pround<Packet4f>(const Packet4f& a) {
  Packet4f t = vec_add(
      reinterpret_cast<Packet4f>(vec_or(vec_and(reinterpret_cast<Packet4ui>(a), p4ui_SIGN), p4ui_PREV0DOT5)), a);
  Packet4f res;

#ifdef EIGEN_VECTORIZE_VSX
  __asm__("xvrspiz %x0, %x1\n\t" : "=&wa"(res) : "wa"(t));
#else
  __asm__("vrfiz %0, %1\n\t" : "=v"(res) : "v"(t));
#endif

  return res;
}
template <>
EIGEN_STRONG_INLINE Packet4f pceil<Packet4f>(const Packet4f& a) {
  return vec_ceil(a);
}
template <>
EIGEN_STRONG_INLINE Packet4f pfloor<Packet4f>(const Packet4f& a) {
  return vec_floor(a);
}
template <>
EIGEN_STRONG_INLINE Packet4f ptrunc<Packet4f>(const Packet4f& a) {
  return vec_trunc(a);
}
#ifdef EIGEN_VECTORIZE_VSX
template <>
EIGEN_STRONG_INLINE Packet4f print<Packet4f>(const Packet4f& a) {
  Packet4f res;

  __asm__("xvrspic %x0, %x1\n\t" : "=&wa"(res) : "wa"(a));

  return res;
}
#endif

template <typename Packet>
EIGEN_STRONG_INLINE Packet ploadu_common(const __UNPACK_TYPE__(Packet) * from) {
  EIGEN_DEBUG_ALIGNED_LOAD
#if defined(EIGEN_VECTORIZE_VSX) || !defined(_BIG_ENDIAN)
  EIGEN_DEBUG_UNALIGNED_LOAD
  return vec_xl(0, const_cast<__UNPACK_TYPE__(Packet)*>(from));
#else
  Packet16uc MSQ, LSQ;
  Packet16uc mask;
  MSQ = vec_ld(0, (unsigned char*)from);   // most significant quadword
  LSQ = vec_ld(15, (unsigned char*)from);  // least significant quadword
  mask = vec_lvsl(0, from);                // create the permute mask
  // TODO: Add static_cast here
  return (Packet)vec_perm(MSQ, LSQ, mask);  // align the data
#endif
}

template <>
EIGEN_STRONG_INLINE Packet4f ploadu<Packet4f>(const float* from) {
  return ploadu_common<Packet4f>(from);
}
template <>
EIGEN_STRONG_INLINE Packet4i ploadu<Packet4i>(const int* from) {
  return ploadu_common<Packet4i>(from);
}
template <>
EIGEN_STRONG_INLINE Packet8s ploadu<Packet8s>(const short int* from) {
  return ploadu_common<Packet8s>(from);
}
template <>
EIGEN_STRONG_INLINE Packet8us ploadu<Packet8us>(const unsigned short int* from) {
  return ploadu_common<Packet8us>(from);
}
template <>
EIGEN_STRONG_INLINE Packet8bf ploadu<Packet8bf>(const bfloat16* from) {
  return ploadu_common<Packet8us>(reinterpret_cast<const unsigned short int*>(from));
}
template <>
EIGEN_STRONG_INLINE Packet16c ploadu<Packet16c>(const signed char* from) {
  return ploadu_common<Packet16c>(from);
}
template <>
EIGEN_STRONG_INLINE Packet16uc ploadu<Packet16uc>(const unsigned char* from) {
  return ploadu_common<Packet16uc>(from);
}

template <typename Packet>
EIGEN_ALWAYS_INLINE Packet ploadu_partial_common(const __UNPACK_TYPE__(Packet) * from, const Index n,
                                                 const Index offset) {
  const Index packet_size = unpacket_traits<Packet>::size;
  eigen_internal_assert(n + offset <= packet_size && "number of elements plus offset will read past end of packet");
  const Index size = sizeof(__UNPACK_TYPE__(Packet));
#ifdef _ARCH_PWR9
  EIGEN_UNUSED_VARIABLE(packet_size);
  EIGEN_DEBUG_ALIGNED_LOAD
  EIGEN_DEBUG_UNALIGNED_LOAD
  Packet load = vec_xl_len(const_cast<__UNPACK_TYPE__(Packet)*>(from), n * size);
  if (offset) {
    Packet16uc shift = pset1<Packet16uc>(offset * 8 * size);
#ifdef _BIG_ENDIAN
    load = Packet(vec_sro(Packet16uc(load), shift));
#else
    load = Packet(vec_slo(Packet16uc(load), shift));
#endif
  }
  return load;
#else
  if (n) {
    EIGEN_ALIGN16 __UNPACK_TYPE__(Packet) load[packet_size];
    unsigned char* load2 = reinterpret_cast<unsigned char*>(load + offset);
    unsigned char* from2 = reinterpret_cast<unsigned char*>(const_cast<__UNPACK_TYPE__(Packet)*>(from));
    Index n2 = n * size;
    if (16 <= n2) {
      pstoreu(load2, ploadu<Packet16uc>(from2));
    } else {
      memcpy((void*)load2, (void*)from2, n2);
    }
    return pload_ignore<Packet>(load);
  } else {
    return Packet(pset1<Packet16uc>(0));
  }
#endif
}

template <>
EIGEN_ALWAYS_INLINE Packet4f ploadu_partial<Packet4f>(const float* from, const Index n, const Index offset) {
  return ploadu_partial_common<Packet4f>(from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE Packet4i ploadu_partial<Packet4i>(const int* from, const Index n, const Index offset) {
  return ploadu_partial_common<Packet4i>(from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE Packet8s ploadu_partial<Packet8s>(const short int* from, const Index n, const Index offset) {
  return ploadu_partial_common<Packet8s>(from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE Packet8us ploadu_partial<Packet8us>(const unsigned short int* from, const Index n,
                                                        const Index offset) {
  return ploadu_partial_common<Packet8us>(from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE Packet8bf ploadu_partial<Packet8bf>(const bfloat16* from, const Index n, const Index offset) {
  return ploadu_partial_common<Packet8us>(reinterpret_cast<const unsigned short int*>(from), n, offset);
}
template <>
EIGEN_ALWAYS_INLINE Packet16c ploadu_partial<Packet16c>(const signed char* from, const Index n, const Index offset) {
  return ploadu_partial_common<Packet16c>(from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE Packet16uc ploadu_partial<Packet16uc>(const unsigned char* from, const Index n,
                                                          const Index offset) {
  return ploadu_partial_common<Packet16uc>(from, n, offset);
}

template <typename Packet>
EIGEN_STRONG_INLINE Packet ploaddup_common(const __UNPACK_TYPE__(Packet) * from) {
  Packet p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet>(from);
  else
    p = ploadu<Packet>(from);
  return vec_mergeh(p, p);
}
template <>
EIGEN_STRONG_INLINE Packet4f ploaddup<Packet4f>(const float* from) {
  return ploaddup_common<Packet4f>(from);
}
template <>
EIGEN_STRONG_INLINE Packet4i ploaddup<Packet4i>(const int* from) {
  return ploaddup_common<Packet4i>(from);
}

template <>
EIGEN_STRONG_INLINE Packet8s ploaddup<Packet8s>(const short int* from) {
  Packet8s p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet8s>(from);
  else
    p = ploadu<Packet8s>(from);
  return vec_mergeh(p, p);
}

template <>
EIGEN_STRONG_INLINE Packet8us ploaddup<Packet8us>(const unsigned short int* from) {
  Packet8us p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet8us>(from);
  else
    p = ploadu<Packet8us>(from);
  return vec_mergeh(p, p);
}

template <>
EIGEN_STRONG_INLINE Packet8s ploadquad<Packet8s>(const short int* from) {
  Packet8s p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet8s>(from);
  else
    p = ploadu<Packet8s>(from);
  return vec_perm(p, p, p16uc_QUADRUPLICATE16_HI);
}

template <>
EIGEN_STRONG_INLINE Packet8us ploadquad<Packet8us>(const unsigned short int* from) {
  Packet8us p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet8us>(from);
  else
    p = ploadu<Packet8us>(from);
  return vec_perm(p, p, p16uc_QUADRUPLICATE16_HI);
}

template <>
EIGEN_STRONG_INLINE Packet8bf ploadquad<Packet8bf>(const bfloat16* from) {
  return ploadquad<Packet8us>(reinterpret_cast<const unsigned short int*>(from));
}

template <>
EIGEN_STRONG_INLINE Packet16c ploaddup<Packet16c>(const signed char* from) {
  Packet16c p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet16c>(from);
  else
    p = ploadu<Packet16c>(from);
  return vec_mergeh(p, p);
}

template <>
EIGEN_STRONG_INLINE Packet16uc ploaddup<Packet16uc>(const unsigned char* from) {
  Packet16uc p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet16uc>(from);
  else
    p = ploadu<Packet16uc>(from);
  return vec_mergeh(p, p);
}

template <>
EIGEN_STRONG_INLINE Packet16c ploadquad<Packet16c>(const signed char* from) {
  Packet16c p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet16c>(from);
  else
    p = ploadu<Packet16c>(from);
  return vec_perm(p, p, p16uc_QUADRUPLICATE16);
}

template <>
EIGEN_STRONG_INLINE Packet16uc ploadquad<Packet16uc>(const unsigned char* from) {
  Packet16uc p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet16uc>(from);
  else
    p = ploadu<Packet16uc>(from);
  return vec_perm(p, p, p16uc_QUADRUPLICATE16);
}

template <typename Packet>
EIGEN_STRONG_INLINE void pstoreu_common(__UNPACK_TYPE__(Packet) * to, const Packet& from) {
  EIGEN_DEBUG_UNALIGNED_STORE
#if defined(EIGEN_VECTORIZE_VSX) || !defined(_BIG_ENDIAN)
  vec_xst(from, 0, to);
#else
  // Taken from http://developer.apple.com/hardwaredrivers/ve/alignment.html
  // Warning: not thread safe!
  Packet16uc MSQ, LSQ, edges;
  Packet16uc edgeAlign, align;

  MSQ = vec_ld(0, (unsigned char*)to);             // most significant quadword
  LSQ = vec_ld(15, (unsigned char*)to);            // least significant quadword
  edgeAlign = vec_lvsl(0, to);                     // permute map to extract edges
  edges = vec_perm(LSQ, MSQ, edgeAlign);           // extract the edges
  align = vec_lvsr(0, to);                         // permute map to misalign data
  MSQ = vec_perm(edges, (Packet16uc)from, align);  // misalign the data (MSQ)
  LSQ = vec_perm((Packet16uc)from, edges, align);  // misalign the data (LSQ)
  vec_st(LSQ, 15, (unsigned char*)to);             // Store the LSQ part first
  vec_st(MSQ, 0, (unsigned char*)to);              // Store the MSQ part second
#endif
}
template <>
EIGEN_STRONG_INLINE void pstoreu<float>(float* to, const Packet4f& from) {
  pstoreu_common<Packet4f>(to, from);
}
template <>
EIGEN_STRONG_INLINE void pstoreu<int>(int* to, const Packet4i& from) {
  pstoreu_common<Packet4i>(to, from);
}
template <>
EIGEN_STRONG_INLINE void pstoreu<short int>(short int* to, const Packet8s& from) {
  pstoreu_common<Packet8s>(to, from);
}
template <>
EIGEN_STRONG_INLINE void pstoreu<unsigned short int>(unsigned short int* to, const Packet8us& from) {
  pstoreu_common<Packet8us>(to, from);
}
template <>
EIGEN_STRONG_INLINE void pstoreu<bfloat16>(bfloat16* to, const Packet8bf& from) {
  pstoreu_common<Packet8us>(reinterpret_cast<unsigned short int*>(to), from.m_val);
}
template <>
EIGEN_STRONG_INLINE void pstoreu<signed char>(signed char* to, const Packet16c& from) {
  pstoreu_common<Packet16c>(to, from);
}
template <>
EIGEN_STRONG_INLINE void pstoreu<unsigned char>(unsigned char* to, const Packet16uc& from) {
  pstoreu_common<Packet16uc>(to, from);
}

template <typename Packet>
EIGEN_ALWAYS_INLINE void pstoreu_partial_common(__UNPACK_TYPE__(Packet) * to, const Packet& from, const Index n,
                                                const Index offset) {
  const Index packet_size = unpacket_traits<Packet>::size;
  eigen_internal_assert(n + offset <= packet_size && "number of elements plus offset will write past end of packet");
  const Index size = sizeof(__UNPACK_TYPE__(Packet));
#ifdef _ARCH_PWR9
  EIGEN_UNUSED_VARIABLE(packet_size);
  EIGEN_DEBUG_UNALIGNED_STORE
  Packet store = from;
  if (offset) {
    Packet16uc shift = pset1<Packet16uc>(offset * 8 * size);
#ifdef _BIG_ENDIAN
    store = Packet(vec_slo(Packet16uc(store), shift));
#else
    store = Packet(vec_sro(Packet16uc(store), shift));
#endif
  }
  vec_xst_len(store, to, n * size);
#else
  if (n) {
    EIGEN_ALIGN16 __UNPACK_TYPE__(Packet) store[packet_size];
    pstore(store, from);
    unsigned char* store2 = reinterpret_cast<unsigned char*>(store + offset);
    unsigned char* to2 = reinterpret_cast<unsigned char*>(to);
    Index n2 = n * size;
    if (16 <= n2) {
      pstoreu(to2, ploadu<Packet16uc>(store2));
    } else {
      memcpy((void*)to2, (void*)store2, n2);
    }
  }
#endif
}

template <>
EIGEN_ALWAYS_INLINE void pstoreu_partial<float>(float* to, const Packet4f& from, const Index n, const Index offset) {
  pstoreu_partial_common<Packet4f>(to, from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE void pstoreu_partial<int>(int* to, const Packet4i& from, const Index n, const Index offset) {
  pstoreu_partial_common<Packet4i>(to, from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE void pstoreu_partial<short int>(short int* to, const Packet8s& from, const Index n,
                                                    const Index offset) {
  pstoreu_partial_common<Packet8s>(to, from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE void pstoreu_partial<unsigned short int>(unsigned short int* to, const Packet8us& from,
                                                             const Index n, const Index offset) {
  pstoreu_partial_common<Packet8us>(to, from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE void pstoreu_partial<bfloat16>(bfloat16* to, const Packet8bf& from, const Index n,
                                                   const Index offset) {
  pstoreu_partial_common<Packet8us>(reinterpret_cast<unsigned short int*>(to), from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE void pstoreu_partial<signed char>(signed char* to, const Packet16c& from, const Index n,
                                                      const Index offset) {
  pstoreu_partial_common<Packet16c>(to, from, n, offset);
}
template <>
EIGEN_ALWAYS_INLINE void pstoreu_partial<unsigned char>(unsigned char* to, const Packet16uc& from, const Index n,
                                                        const Index offset) {
  pstoreu_partial_common<Packet16uc>(to, from, n, offset);
}

template <>
EIGEN_STRONG_INLINE void prefetch<float>(const float* addr) {
  EIGEN_PPC_PREFETCH(addr);
}
template <>
EIGEN_STRONG_INLINE void prefetch<int>(const int* addr) {
  EIGEN_PPC_PREFETCH(addr);
}

template <>
EIGEN_STRONG_INLINE float pfirst<Packet4f>(const Packet4f& a) {
  EIGEN_ALIGN16 float x;
  vec_ste(a, 0, &x);
  return x;
}
template <>
EIGEN_STRONG_INLINE int pfirst<Packet4i>(const Packet4i& a) {
  EIGEN_ALIGN16 int x;
  vec_ste(a, 0, &x);
  return x;
}

template <typename Packet>
EIGEN_STRONG_INLINE __UNPACK_TYPE__(Packet) pfirst_common(const Packet& a) {
  EIGEN_ALIGN16 __UNPACK_TYPE__(Packet) x;
  vec_ste(a, 0, &x);
  return x;
}

template <>
EIGEN_STRONG_INLINE short int pfirst<Packet8s>(const Packet8s& a) {
  return pfirst_common<Packet8s>(a);
}

template <>
EIGEN_STRONG_INLINE unsigned short int pfirst<Packet8us>(const Packet8us& a) {
  return pfirst_common<Packet8us>(a);
}

template <>
EIGEN_STRONG_INLINE signed char pfirst<Packet16c>(const Packet16c& a) {
  return pfirst_common<Packet16c>(a);
}

template <>
EIGEN_STRONG_INLINE unsigned char pfirst<Packet16uc>(const Packet16uc& a) {
  return pfirst_common<Packet16uc>(a);
}

template <>
EIGEN_STRONG_INLINE Packet4f preverse(const Packet4f& a) {
  return reinterpret_cast<Packet4f>(
      vec_perm(reinterpret_cast<Packet16uc>(a), reinterpret_cast<Packet16uc>(a), p16uc_REVERSE32));
}
template <>
EIGEN_STRONG_INLINE Packet4i preverse(const Packet4i& a) {
  return reinterpret_cast<Packet4i>(
      vec_perm(reinterpret_cast<Packet16uc>(a), reinterpret_cast<Packet16uc>(a), p16uc_REVERSE32));
}
template <>
EIGEN_STRONG_INLINE Packet8s preverse(const Packet8s& a) {
  return reinterpret_cast<Packet8s>(
      vec_perm(reinterpret_cast<Packet16uc>(a), reinterpret_cast<Packet16uc>(a), p16uc_REVERSE16));
}
template <>
EIGEN_STRONG_INLINE Packet8us preverse(const Packet8us& a) {
  return reinterpret_cast<Packet8us>(
      vec_perm(reinterpret_cast<Packet16uc>(a), reinterpret_cast<Packet16uc>(a), p16uc_REVERSE16));
}
template <>
EIGEN_STRONG_INLINE Packet16c preverse(const Packet16c& a) {
  return vec_perm(a, a, p16uc_REVERSE8);
}
template <>
EIGEN_STRONG_INLINE Packet16uc preverse(const Packet16uc& a) {
  return vec_perm(a, a, p16uc_REVERSE8);
}
template <>
EIGEN_STRONG_INLINE Packet8bf preverse(const Packet8bf& a) {
  return preverse<Packet8us>(a);
}

template <>
EIGEN_STRONG_INLINE Packet4f pabs(const Packet4f& a) {
  return vec_abs(a);
}
template <>
EIGEN_STRONG_INLINE Packet4i pabs(const Packet4i& a) {
  return vec_abs(a);
}
template <>
EIGEN_STRONG_INLINE Packet8s pabs(const Packet8s& a) {
  return vec_abs(a);
}
template <>
EIGEN_STRONG_INLINE Packet8us pabs(const Packet8us& a) {
  return a;
}
template <>
EIGEN_STRONG_INLINE Packet16c pabs(const Packet16c& a) {
  return vec_abs(a);
}
template <>
EIGEN_STRONG_INLINE Packet16uc pabs(const Packet16uc& a) {
  return a;
}
template <>
EIGEN_STRONG_INLINE Packet8bf pabs(const Packet8bf& a) {
  EIGEN_DECLARE_CONST_FAST_Packet8us(abs_mask, 0x7FFF);
  return pand<Packet8us>(p8us_abs_mask, a);
}

template <>
EIGEN_STRONG_INLINE Packet8bf psignbit(const Packet8bf& a) {
  return vec_sra(a.m_val, vec_splat_u16(15));
}
template <>
EIGEN_STRONG_INLINE Packet4f psignbit(const Packet4f& a) {
  return (Packet4f)vec_sra((Packet4i)a, vec_splats((unsigned int)(31)));
}

template <int N>
EIGEN_STRONG_INLINE Packet4i parithmetic_shift_right(const Packet4i& a) {
  return vec_sra(a, reinterpret_cast<Packet4ui>(pset1<Packet4i>(N)));
}
template <int N>
EIGEN_STRONG_INLINE Packet4i plogical_shift_right(const Packet4i& a) {
  return vec_sr(a, reinterpret_cast<Packet4ui>(pset1<Packet4i>(N)));
}
template <int N>
EIGEN_STRONG_INLINE Packet4i plogical_shift_left(const Packet4i& a) {
  return vec_sl(a, reinterpret_cast<Packet4ui>(pset1<Packet4i>(N)));
}
template <int N>
EIGEN_STRONG_INLINE Packet4f plogical_shift_left(const Packet4f& a) {
  const EIGEN_DECLARE_CONST_FAST_Packet4ui(mask, N);
  Packet4ui r = vec_sl(reinterpret_cast<Packet4ui>(a), p4ui_mask);
  return reinterpret_cast<Packet4f>(r);
}

template <int N>
EIGEN_STRONG_INLINE Packet4f plogical_shift_right(const Packet4f& a) {
  const EIGEN_DECLARE_CONST_FAST_Packet4ui(mask, N);
  Packet4ui r = vec_sr(reinterpret_cast<Packet4ui>(a), p4ui_mask);
  return reinterpret_cast<Packet4f>(r);
}

template <int N>
EIGEN_STRONG_INLINE Packet4ui plogical_shift_right(const Packet4ui& a) {
  const EIGEN_DECLARE_CONST_FAST_Packet4ui(mask, N);
  return vec_sr(a, p4ui_mask);
}

template <int N>
EIGEN_STRONG_INLINE Packet4ui plogical_shift_left(const Packet4ui& a) {
  const EIGEN_DECLARE_CONST_FAST_Packet4ui(mask, N);
  return vec_sl(a, p4ui_mask);
}

template <int N>
EIGEN_STRONG_INLINE Packet8us plogical_shift_left(const Packet8us& a) {
  const EIGEN_DECLARE_CONST_FAST_Packet8us(mask, N);
  return vec_sl(a, p8us_mask);
}
template <int N>
EIGEN_STRONG_INLINE Packet8us plogical_shift_right(const Packet8us& a) {
  const EIGEN_DECLARE_CONST_FAST_Packet8us(mask, N);
  return vec_sr(a, p8us_mask);
}

EIGEN_STRONG_INLINE Packet4f Bf16ToF32Even(const Packet8bf& bf) {
  return plogical_shift_left<16>(reinterpret_cast<Packet4f>(bf.m_val));
}

EIGEN_STRONG_INLINE Packet4f Bf16ToF32Odd(const Packet8bf& bf) {
  const EIGEN_DECLARE_CONST_FAST_Packet4ui(high_mask, 0xFFFF0000);
  return pand<Packet4f>(reinterpret_cast<Packet4f>(bf.m_val), reinterpret_cast<Packet4f>(p4ui_high_mask));
}

EIGEN_ALWAYS_INLINE Packet8us pmerge(Packet4ui even, Packet4ui odd) {
#ifdef _BIG_ENDIAN
  return vec_perm(reinterpret_cast<Packet8us>(odd), reinterpret_cast<Packet8us>(even), p16uc_MERGEO16);
#else
  return vec_perm(reinterpret_cast<Packet8us>(even), reinterpret_cast<Packet8us>(odd), p16uc_MERGEE16);
#endif
}

// Simple interleaving of bool masks, prevents true values from being
// converted to NaNs.
EIGEN_STRONG_INLINE Packet8bf F32ToBf16Bool(Packet4f even, Packet4f odd) {
  return pmerge(reinterpret_cast<Packet4ui>(even), reinterpret_cast<Packet4ui>(odd));
}

// #define SUPPORT_BF16_SUBNORMALS

#ifndef __VEC_CLASS_FP_NAN
#define __VEC_CLASS_FP_NAN (1 << 6)
#endif

#if defined(SUPPORT_BF16_SUBNORMALS) && !defined(__VEC_CLASS_FP_SUBNORMAL)
#define __VEC_CLASS_FP_SUBNORMAL_P (1 << 1)
#define __VEC_CLASS_FP_SUBNORMAL_N (1 << 0)

#define __VEC_CLASS_FP_SUBNORMAL (__VEC_CLASS_FP_SUBNORMAL_P | __VEC_CLASS_FP_SUBNORMAL_N)
#endif

EIGEN_STRONG_INLINE Packet8bf F32ToBf16(Packet4f p4f) {
#ifdef _ARCH_PWR10
  return reinterpret_cast<Packet8us>(__builtin_vsx_xvcvspbf16(reinterpret_cast<Packet16uc>(p4f)));
#else
  Packet4ui input = reinterpret_cast<Packet4ui>(p4f);
  Packet4ui lsb = plogical_shift_right<16>(input);
  lsb = pand<Packet4ui>(lsb, reinterpret_cast<Packet4ui>(p4i_ONE));

  EIGEN_DECLARE_CONST_FAST_Packet4ui(BIAS, 0x7FFFu);
  Packet4ui rounding_bias = padd<Packet4ui>(lsb, p4ui_BIAS);
  input = padd<Packet4ui>(input, rounding_bias);

  const EIGEN_DECLARE_CONST_FAST_Packet4ui(nan, 0x7FC00000);
#ifdef _ARCH_PWR9
  Packet4bi nan_selector = vec_test_data_class(p4f, __VEC_CLASS_FP_NAN);
  input = vec_sel(input, p4ui_nan, nan_selector);

#ifdef SUPPORT_BF16_SUBNORMALS
  Packet4bi subnormal_selector = vec_test_data_class(p4f, __VEC_CLASS_FP_SUBNORMAL);
  input = vec_sel(input, reinterpret_cast<Packet4ui>(p4f), subnormal_selector);
#endif
#else
#ifdef SUPPORT_BF16_SUBNORMALS
  // Test NaN and Subnormal
  const EIGEN_DECLARE_CONST_FAST_Packet4ui(exp_mask, 0x7F800000);
  Packet4ui exp = pand<Packet4ui>(p4ui_exp_mask, reinterpret_cast<Packet4ui>(p4f));

  const EIGEN_DECLARE_CONST_FAST_Packet4ui(mantissa_mask, 0x7FFFFF);
  Packet4ui mantissa = pand<Packet4ui>(p4ui_mantissa_mask, reinterpret_cast<Packet4ui>(p4f));

  Packet4bi is_max_exp = vec_cmpeq(exp, p4ui_exp_mask);
  Packet4bi is_mant_zero = vec_cmpeq(mantissa, reinterpret_cast<Packet4ui>(p4i_ZERO));

  Packet4ui nan_selector =
      pandnot<Packet4ui>(reinterpret_cast<Packet4ui>(is_max_exp), reinterpret_cast<Packet4ui>(is_mant_zero));

  Packet4bi is_zero_exp = vec_cmpeq(exp, reinterpret_cast<Packet4ui>(p4i_ZERO));

  Packet4ui subnormal_selector =
      pandnot<Packet4ui>(reinterpret_cast<Packet4ui>(is_zero_exp), reinterpret_cast<Packet4ui>(is_mant_zero));

  input = vec_sel(input, p4ui_nan, nan_selector);
  input = vec_sel(input, reinterpret_cast<Packet4ui>(p4f), subnormal_selector);
#else
  // Test only NaN
  Packet4bi nan_selector = vec_cmpeq(p4f, p4f);

  input = vec_sel(p4ui_nan, input, nan_selector);
#endif
#endif

  input = plogical_shift_right<16>(input);
  return reinterpret_cast<Packet8us>(input);
#endif
}

#ifdef _BIG_ENDIAN
/**
 * Pack the high portion of two float Packets into one bfloat16 Packet
 *
 * @param lohi to expect either a low & high OR odd & even order
 */
template <bool lohi>
EIGEN_ALWAYS_INLINE Packet8bf Bf16PackHigh(Packet4f lo, Packet4f hi) {
  if (lohi) {
    return vec_perm(reinterpret_cast<Packet8us>(lo), reinterpret_cast<Packet8us>(hi), p16uc_MERGEH16);
  } else {
    return vec_perm(reinterpret_cast<Packet8us>(hi), reinterpret_cast<Packet8us>(lo), p16uc_MERGEE16);
  }
}

/**
 * Pack the low portion of two float Packets into one bfloat16 Packet
 *
 * @param lohi to expect either a low & high OR odd & even order
 */
template <bool lohi>
EIGEN_ALWAYS_INLINE Packet8bf Bf16PackLow(Packet4f lo, Packet4f hi) {
  if (lohi) {
    return vec_pack(reinterpret_cast<Packet4ui>(lo), reinterpret_cast<Packet4ui>(hi));
  } else {
    return vec_perm(reinterpret_cast<Packet8us>(hi), reinterpret_cast<Packet8us>(lo), p16uc_MERGEO16);
  }
}
#else
template <bool lohi>
EIGEN_ALWAYS_INLINE Packet8bf Bf16PackLow(Packet4f hi, Packet4f lo) {
  if (lohi) {
    return vec_pack(reinterpret_cast<Packet4ui>(hi), reinterpret_cast<Packet4ui>(lo));
  } else {
    return vec_perm(reinterpret_cast<Packet8us>(hi), reinterpret_cast<Packet8us>(lo), p16uc_MERGEE16);
  }
}

template <bool lohi>
EIGEN_ALWAYS_INLINE Packet8bf Bf16PackHigh(Packet4f hi, Packet4f lo) {
  if (lohi) {
    return vec_perm(reinterpret_cast<Packet8us>(hi), reinterpret_cast<Packet8us>(lo), p16uc_MERGEL16);
  } else {
    return vec_perm(reinterpret_cast<Packet8us>(hi), reinterpret_cast<Packet8us>(lo), p16uc_MERGEO16);
  }
}
#endif

/**
 * Convert and pack two float Packets into one bfloat16 Packet
 *
 * @param lohi to expect either a low & high OR odd & even order
 */
template <bool lohi = true>
EIGEN_ALWAYS_INLINE Packet8bf F32ToBf16Two(Packet4f lo, Packet4f hi) {
  Packet8us p4f = Bf16PackHigh<lohi>(lo, hi);
  Packet8us p4f2 = Bf16PackLow<lohi>(lo, hi);

  Packet8us lsb = pand<Packet8us>(p4f, p8us_ONE);
  EIGEN_DECLARE_CONST_FAST_Packet8us(BIAS, 0x7FFFu);
  lsb = padd<Packet8us>(lsb, p8us_BIAS);
  lsb = padd<Packet8us>(lsb, p4f2);

  Packet8bi rounding_bias = vec_cmplt(lsb, p4f2);
  Packet8us input = psub<Packet8us>(p4f, reinterpret_cast<Packet8us>(rounding_bias));

#ifdef _ARCH_PWR9
  Packet4bi nan_selector_lo = vec_test_data_class(lo, __VEC_CLASS_FP_NAN);
  Packet4bi nan_selector_hi = vec_test_data_class(hi, __VEC_CLASS_FP_NAN);
  Packet8us nan_selector =
      Bf16PackLow<lohi>(reinterpret_cast<Packet4f>(nan_selector_lo), reinterpret_cast<Packet4f>(nan_selector_hi));

  input = vec_sel(input, p8us_BIAS, nan_selector);

#ifdef SUPPORT_BF16_SUBNORMALS
  Packet4bi subnormal_selector_lo = vec_test_data_class(lo, __VEC_CLASS_FP_SUBNORMAL);
  Packet4bi subnormal_selector_hi = vec_test_data_class(hi, __VEC_CLASS_FP_SUBNORMAL);
  Packet8us subnormal_selector = Bf16PackLow<lohi>(reinterpret_cast<Packet4f>(subnormal_selector_lo),
                                                   reinterpret_cast<Packet4f>(subnormal_selector_hi));

  input = vec_sel(input, reinterpret_cast<Packet8us>(p4f), subnormal_selector);
#endif
#else
#ifdef SUPPORT_BF16_SUBNORMALS
  // Test NaN and Subnormal
  const EIGEN_DECLARE_CONST_FAST_Packet8us(exp_mask, 0x7F80);
  Packet8us exp = pand<Packet8us>(p8us_exp_mask, p4f);

  const EIGEN_DECLARE_CONST_FAST_Packet8us(mantissa_mask, 0x7Fu);
  Packet8us mantissa = pand<Packet8us>(p8us_mantissa_mask, p4f);

  Packet8bi is_max_exp = vec_cmpeq(exp, p8us_exp_mask);
  Packet8bi is_mant_zero = vec_cmpeq(mantissa, reinterpret_cast<Packet8us>(p4i_ZERO));

  Packet8us nan_selector =
      pandnot<Packet8us>(reinterpret_cast<Packet8us>(is_max_exp), reinterpret_cast<Packet8us>(is_mant_zero));

  Packet8bi is_zero_exp = vec_cmpeq(exp, reinterpret_cast<Packet8us>(p4i_ZERO));

  Packet8us subnormal_selector =
      pandnot<Packet8us>(reinterpret_cast<Packet8us>(is_zero_exp), reinterpret_cast<Packet8us>(is_mant_zero));

  // Using BIAS as NaN (since any or all of the last 7 bits can be set)
  input = vec_sel(input, p8us_BIAS, nan_selector);
  input = vec_sel(input, reinterpret_cast<Packet8us>(p4f), subnormal_selector);
#else
  // Test only NaN
  Packet4bi nan_selector_lo = vec_cmpeq(lo, lo);
  Packet4bi nan_selector_hi = vec_cmpeq(hi, hi);
  Packet8us nan_selector =
      Bf16PackLow<lohi>(reinterpret_cast<Packet4f>(nan_selector_lo), reinterpret_cast<Packet4f>(nan_selector_hi));

  input = vec_sel(p8us_BIAS, input, nan_selector);
#endif
#endif

  return input;
}

/**
 * Convert and pack two float Packets into one bfloat16 Packet - low & high order
 */
EIGEN_STRONG_INLINE Packet8bf F32ToBf16Both(Packet4f lo, Packet4f hi) {
#ifdef _ARCH_PWR10
  Packet8bf fp16_0 = F32ToBf16(lo);
  Packet8bf fp16_1 = F32ToBf16(hi);
  return vec_pack(reinterpret_cast<Packet4ui>(fp16_0.m_val), reinterpret_cast<Packet4ui>(fp16_1.m_val));
#else
  return F32ToBf16Two(lo, hi);
#endif
}

/**
 * Convert and pack two float Packets into one bfloat16 Packet - odd & even order
 */
EIGEN_STRONG_INLINE Packet8bf F32ToBf16(Packet4f even, Packet4f odd) {
#ifdef _ARCH_PWR10
  return pmerge(reinterpret_cast<Packet4ui>(F32ToBf16(even).m_val), reinterpret_cast<Packet4ui>(F32ToBf16(odd).m_val));
#else
  return F32ToBf16Two<false>(even, odd);
#endif
}
#define BF16_TO_F32_UNARY_OP_WRAPPER(OP, A) \
  Packet4f a_even = Bf16ToF32Even(A);       \
  Packet4f a_odd = Bf16ToF32Odd(A);         \
  Packet4f op_even = OP(a_even);            \
  Packet4f op_odd = OP(a_odd);              \
  return F32ToBf16(op_even, op_odd);

#define BF16_TO_F32_BINARY_OP_WRAPPER(OP, A, B) \
  Packet4f a_even = Bf16ToF32Even(A);           \
  Packet4f a_odd = Bf16ToF32Odd(A);             \
  Packet4f b_even = Bf16ToF32Even(B);           \
  Packet4f b_odd = Bf16ToF32Odd(B);             \
  Packet4f op_even = OP(a_even, b_even);        \
  Packet4f op_odd = OP(a_odd, b_odd);           \
  return F32ToBf16(op_even, op_odd);

#define BF16_TO_F32_BINARY_OP_WRAPPER_BOOL(OP, A, B) \
  Packet4f a_even = Bf16ToF32Even(A);                \
  Packet4f a_odd = Bf16ToF32Odd(A);                  \
  Packet4f b_even = Bf16ToF32Even(B);                \
  Packet4f b_odd = Bf16ToF32Odd(B);                  \
  Packet4f op_even = OP(a_even, b_even);             \
  Packet4f op_odd = OP(a_odd, b_odd);                \
  return F32ToBf16Bool(op_even, op_odd);

template <>
EIGEN_STRONG_INLINE Packet8bf padd<Packet8bf>(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER(padd<Packet4f>, a, b);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pmul<Packet8bf>(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER(pmul<Packet4f>, a, b);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pdiv<Packet8bf>(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER(pdiv<Packet4f>, a, b);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pnegate<Packet8bf>(const Packet8bf& a) {
  EIGEN_DECLARE_CONST_FAST_Packet8us(neg_mask, 0x8000);
  return pxor<Packet8us>(p8us_neg_mask, a);
}

template <>
EIGEN_STRONG_INLINE Packet8bf psub<Packet8bf>(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER(psub<Packet4f>, a, b);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pexp<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(pexp_float, a);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pexp2<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(generic_exp2, a);
}

template <>
EIGEN_STRONG_INLINE Packet4f pldexp<Packet4f>(const Packet4f& a, const Packet4f& exponent) {
  return pldexp_generic(a, exponent);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pldexp<Packet8bf>(const Packet8bf& a, const Packet8bf& exponent) {
  BF16_TO_F32_BINARY_OP_WRAPPER(pldexp<Packet4f>, a, exponent);
}

template <>
EIGEN_STRONG_INLINE Packet4f pfrexp<Packet4f>(const Packet4f& a, Packet4f& exponent) {
  return pfrexp_generic(a, exponent);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pfrexp<Packet8bf>(const Packet8bf& a, Packet8bf& e) {
  Packet4f a_even = Bf16ToF32Even(a);
  Packet4f a_odd = Bf16ToF32Odd(a);
  Packet4f e_even;
  Packet4f e_odd;
  Packet4f op_even = pfrexp<Packet4f>(a_even, e_even);
  Packet4f op_odd = pfrexp<Packet4f>(a_odd, e_odd);
  e = F32ToBf16(e_even, e_odd);
  return F32ToBf16(op_even, op_odd);
}

template <>
EIGEN_STRONG_INLINE Packet8bf psin<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(psin_float, a);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pcos<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(pcos_float, a);
}
template <>
EIGEN_STRONG_INLINE Packet8bf plog<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(plog_float, a);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pfloor<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(pfloor<Packet4f>, a);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pceil<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(pceil<Packet4f>, a);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pround<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(pround<Packet4f>, a);
}
template <>
EIGEN_STRONG_INLINE Packet8bf ptrunc<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(ptrunc<Packet4f>, a);
}
#ifdef EIGEN_VECTORIZE_VSX
template <>
EIGEN_STRONG_INLINE Packet8bf print<Packet8bf>(const Packet8bf& a) {
  BF16_TO_F32_UNARY_OP_WRAPPER(print<Packet4f>, a);
}
#endif
template <>
EIGEN_STRONG_INLINE Packet8bf pmadd(const Packet8bf& a, const Packet8bf& b, const Packet8bf& c) {
  Packet4f a_even = Bf16ToF32Even(a);
  Packet4f a_odd = Bf16ToF32Odd(a);
  Packet4f b_even = Bf16ToF32Even(b);
  Packet4f b_odd = Bf16ToF32Odd(b);
  Packet4f c_even = Bf16ToF32Even(c);
  Packet4f c_odd = Bf16ToF32Odd(c);
  Packet4f pmadd_even = pmadd<Packet4f>(a_even, b_even, c_even);
  Packet4f pmadd_odd = pmadd<Packet4f>(a_odd, b_odd, c_odd);
  return F32ToBf16(pmadd_even, pmadd_odd);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pmin<Packet8bf>(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER(pmin<Packet4f>, a, b);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pmax<Packet8bf>(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER(pmax<Packet4f>, a, b);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pcmp_lt(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER_BOOL(pcmp_lt<Packet4f>, a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pcmp_lt_or_nan(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER_BOOL(pcmp_lt_or_nan<Packet4f>, a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pcmp_le(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER_BOOL(pcmp_le<Packet4f>, a, b);
}
template <>
EIGEN_STRONG_INLINE Packet8bf pcmp_eq(const Packet8bf& a, const Packet8bf& b) {
  BF16_TO_F32_BINARY_OP_WRAPPER_BOOL(pcmp_eq<Packet4f>, a, b);
}

template <>
EIGEN_STRONG_INLINE bfloat16 pfirst(const Packet8bf& a) {
  return Eigen::bfloat16_impl::raw_uint16_to_bfloat16((pfirst<Packet8us>(a)));
}

template <>
EIGEN_STRONG_INLINE Packet8bf ploaddup<Packet8bf>(const bfloat16* from) {
  return ploaddup<Packet8us>(reinterpret_cast<const unsigned short int*>(from));
}

template <>
EIGEN_STRONG_INLINE Packet8bf plset<Packet8bf>(const bfloat16& a) {
  bfloat16 countdown[8] = {bfloat16(0), bfloat16(1), bfloat16(2), bfloat16(3),
                           bfloat16(4), bfloat16(5), bfloat16(6), bfloat16(7)};
  return padd<Packet8bf>(pset1<Packet8bf>(a), pload<Packet8bf>(countdown));
}

template <>
EIGEN_STRONG_INLINE float predux<Packet4f>(const Packet4f& a) {
  Packet4f b, sum;
  b = vec_sld(a, a, 8);
  sum = a + b;
  b = vec_sld(sum, sum, 4);
  sum += b;
  return pfirst(sum);
}

template <>
EIGEN_STRONG_INLINE int predux<Packet4i>(const Packet4i& a) {
  Packet4i b, sum;
  b = vec_sld(a, a, 8);
  sum = a + b;
  b = vec_sld(sum, sum, 4);
  sum += b;
  return pfirst(sum);
}

template <>
EIGEN_STRONG_INLINE bfloat16 predux<Packet8bf>(const Packet8bf& a) {
  float redux_even = predux<Packet4f>(Bf16ToF32Even(a));
  float redux_odd = predux<Packet4f>(Bf16ToF32Odd(a));
  float f32_result = redux_even + redux_odd;
  return bfloat16(f32_result);
}
template <typename Packet>
EIGEN_STRONG_INLINE __UNPACK_TYPE__(Packet) predux_size8(const Packet& a) {
  union {
    Packet v;
    __UNPACK_TYPE__(Packet) n[8];
  } vt;
  vt.v = a;

  EIGEN_ALIGN16 int first_loader[4] = {vt.n[0], vt.n[1], vt.n[2], vt.n[3]};
  EIGEN_ALIGN16 int second_loader[4] = {vt.n[4], vt.n[5], vt.n[6], vt.n[7]};
  Packet4i first_half = pload<Packet4i>(first_loader);
  Packet4i second_half = pload<Packet4i>(second_loader);

  return static_cast<__UNPACK_TYPE__(Packet)>(predux(first_half) + predux(second_half));
}

template <>
EIGEN_STRONG_INLINE short int predux<Packet8s>(const Packet8s& a) {
  return predux_size8<Packet8s>(a);
}

template <>
EIGEN_STRONG_INLINE unsigned short int predux<Packet8us>(const Packet8us& a) {
  return predux_size8<Packet8us>(a);
}

template <typename Packet>
EIGEN_STRONG_INLINE __UNPACK_TYPE__(Packet) predux_size16(const Packet& a) {
  union {
    Packet v;
    __UNPACK_TYPE__(Packet) n[16];
  } vt;
  vt.v = a;

  EIGEN_ALIGN16 int first_loader[4] = {vt.n[0], vt.n[1], vt.n[2], vt.n[3]};
  EIGEN_ALIGN16 int second_loader[4] = {vt.n[4], vt.n[5], vt.n[6], vt.n[7]};
  EIGEN_ALIGN16 int third_loader[4] = {vt.n[8], vt.n[9], vt.n[10], vt.n[11]};
  EIGEN_ALIGN16 int fourth_loader[4] = {vt.n[12], vt.n[13], vt.n[14], vt.n[15]};

  Packet4i first_quarter = pload<Packet4i>(first_loader);
  Packet4i second_quarter = pload<Packet4i>(second_loader);
  Packet4i third_quarter = pload<Packet4i>(third_loader);
  Packet4i fourth_quarter = pload<Packet4i>(fourth_loader);

  return static_cast<__UNPACK_TYPE__(Packet)>(predux(first_quarter) + predux(second_quarter) + predux(third_quarter) +
                                              predux(fourth_quarter));
}

template <>
EIGEN_STRONG_INLINE signed char predux<Packet16c>(const Packet16c& a) {
  return predux_size16<Packet16c>(a);
}

template <>
EIGEN_STRONG_INLINE unsigned char predux<Packet16uc>(const Packet16uc& a) {
  return predux_size16<Packet16uc>(a);
}

// Other reduction functions:
// mul
template <>
EIGEN_STRONG_INLINE float predux_mul<Packet4f>(const Packet4f& a) {
  Packet4f prod;
  prod = pmul(a, vec_sld(a, a, 8));
  return pfirst(pmul(prod, vec_sld(prod, prod, 4)));
}

template <>
EIGEN_STRONG_INLINE int predux_mul<Packet4i>(const Packet4i& a) {
  EIGEN_ALIGN16 int aux[4];
  pstore(aux, a);
  return aux[0] * aux[1] * aux[2] * aux[3];
}

template <>
EIGEN_STRONG_INLINE short int predux_mul<Packet8s>(const Packet8s& a) {
  Packet8s pair, quad, octo;

  pair = vec_mul(a, vec_sld(a, a, 8));
  quad = vec_mul(pair, vec_sld(pair, pair, 4));
  octo = vec_mul(quad, vec_sld(quad, quad, 2));

  return pfirst(octo);
}

template <>
EIGEN_STRONG_INLINE unsigned short int predux_mul<Packet8us>(const Packet8us& a) {
  Packet8us pair, quad, octo;

  pair = vec_mul(a, vec_sld(a, a, 8));
  quad = vec_mul(pair, vec_sld(pair, pair, 4));
  octo = vec_mul(quad, vec_sld(quad, quad, 2));

  return pfirst(octo);
}

template <>
EIGEN_STRONG_INLINE bfloat16 predux_mul<Packet8bf>(const Packet8bf& a) {
  float redux_even = predux_mul<Packet4f>(Bf16ToF32Even(a));
  float redux_odd = predux_mul<Packet4f>(Bf16ToF32Odd(a));
  float f32_result = redux_even * redux_odd;
  return bfloat16(f32_result);
}

template <>
EIGEN_STRONG_INLINE signed char predux_mul<Packet16c>(const Packet16c& a) {
  Packet16c pair, quad, octo, result;

  pair = vec_mul(a, vec_sld(a, a, 8));
  quad = vec_mul(pair, vec_sld(pair, pair, 4));
  octo = vec_mul(quad, vec_sld(quad, quad, 2));
  result = vec_mul(octo, vec_sld(octo, octo, 1));

  return pfirst(result);
}

template <>
EIGEN_STRONG_INLINE unsigned char predux_mul<Packet16uc>(const Packet16uc& a) {
  Packet16uc pair, quad, octo, result;

  pair = vec_mul(a, vec_sld(a, a, 8));
  quad = vec_mul(pair, vec_sld(pair, pair, 4));
  octo = vec_mul(quad, vec_sld(quad, quad, 2));
  result = vec_mul(octo, vec_sld(octo, octo, 1));

  return pfirst(result);
}

// min
template <typename Packet>
EIGEN_STRONG_INLINE __UNPACK_TYPE__(Packet) predux_min4(const Packet& a) {
  Packet b, res;
  b = vec_min(a, vec_sld(a, a, 8));
  res = vec_min(b, vec_sld(b, b, 4));
  return pfirst(res);
}

template <>
EIGEN_STRONG_INLINE float predux_min<Packet4f>(const Packet4f& a) {
  return predux_min4<Packet4f>(a);
}

template <>
EIGEN_STRONG_INLINE int predux_min<Packet4i>(const Packet4i& a) {
  return predux_min4<Packet4i>(a);
}

template <>
EIGEN_STRONG_INLINE bfloat16 predux_min<Packet8bf>(const Packet8bf& a) {
  float redux_even = predux_min<Packet4f>(Bf16ToF32Even(a));
  float redux_odd = predux_min<Packet4f>(Bf16ToF32Odd(a));
  float f32_result = (std::min)(redux_even, redux_odd);
  return bfloat16(f32_result);
}

template <>
EIGEN_STRONG_INLINE short int predux_min<Packet8s>(const Packet8s& a) {
  Packet8s pair, quad, octo;

  // pair = { Min(a0,a4), Min(a1,a5), Min(a2,a6), Min(a3,a7) }
  pair = vec_min(a, vec_sld(a, a, 8));

  // quad = { Min(a0, a4, a2, a6), Min(a1, a5, a3, a7) }
  quad = vec_min(pair, vec_sld(pair, pair, 4));

  // octo = { Min(a0, a4, a2, a6, a1, a5, a3, a7) }
  octo = vec_min(quad, vec_sld(quad, quad, 2));
  return pfirst(octo);
}

template <>
EIGEN_STRONG_INLINE unsigned short int predux_min<Packet8us>(const Packet8us& a) {
  Packet8us pair, quad, octo;

  // pair = { Min(a0,a4), Min(a1,a5), Min(a2,a6), Min(a3,a7) }
  pair = vec_min(a, vec_sld(a, a, 8));

  // quad = { Min(a0, a4, a2, a6), Min(a1, a5, a3, a7) }
  quad = vec_min(pair, vec_sld(pair, pair, 4));

  // octo = { Min(a0, a4, a2, a6, a1, a5, a3, a7) }
  octo = vec_min(quad, vec_sld(quad, quad, 2));
  return pfirst(octo);
}

template <>
EIGEN_STRONG_INLINE signed char predux_min<Packet16c>(const Packet16c& a) {
  Packet16c pair, quad, octo, result;

  pair = vec_min(a, vec_sld(a, a, 8));
  quad = vec_min(pair, vec_sld(pair, pair, 4));
  octo = vec_min(quad, vec_sld(quad, quad, 2));
  result = vec_min(octo, vec_sld(octo, octo, 1));

  return pfirst(result);
}

template <>
EIGEN_STRONG_INLINE unsigned char predux_min<Packet16uc>(const Packet16uc& a) {
  Packet16uc pair, quad, octo, result;

  pair = vec_min(a, vec_sld(a, a, 8));
  quad = vec_min(pair, vec_sld(pair, pair, 4));
  octo = vec_min(quad, vec_sld(quad, quad, 2));
  result = vec_min(octo, vec_sld(octo, octo, 1));

  return pfirst(result);
}
// max
template <typename Packet>
EIGEN_STRONG_INLINE __UNPACK_TYPE__(Packet) predux_max4(const Packet& a) {
  Packet b, res;
  b = vec_max(a, vec_sld(a, a, 8));
  res = vec_max(b, vec_sld(b, b, 4));
  return pfirst(res);
}

template <>
EIGEN_STRONG_INLINE float predux_max<Packet4f>(const Packet4f& a) {
  return predux_max4<Packet4f>(a);
}

template <>
EIGEN_STRONG_INLINE int predux_max<Packet4i>(const Packet4i& a) {
  return predux_max4<Packet4i>(a);
}

template <>
EIGEN_STRONG_INLINE bfloat16 predux_max<Packet8bf>(const Packet8bf& a) {
  float redux_even = predux_max<Packet4f>(Bf16ToF32Even(a));
  float redux_odd = predux_max<Packet4f>(Bf16ToF32Odd(a));
  float f32_result = (std::max)(redux_even, redux_odd);
  return bfloat16(f32_result);
}

template <>
EIGEN_STRONG_INLINE short int predux_max<Packet8s>(const Packet8s& a) {
  Packet8s pair, quad, octo;

  // pair = { Max(a0,a4), Max(a1,a5), Max(a2,a6), Max(a3,a7) }
  pair = vec_max(a, vec_sld(a, a, 8));

  // quad = { Max(a0, a4, a2, a6), Max(a1, a5, a3, a7) }
  quad = vec_max(pair, vec_sld(pair, pair, 4));

  // octo = { Max(a0, a4, a2, a6, a1, a5, a3, a7) }
  octo = vec_max(quad, vec_sld(quad, quad, 2));
  return pfirst(octo);
}

template <>
EIGEN_STRONG_INLINE unsigned short int predux_max<Packet8us>(const Packet8us& a) {
  Packet8us pair, quad, octo;

  // pair = { Max(a0,a4), Max(a1,a5), Max(a2,a6), Max(a3,a7) }
  pair = vec_max(a, vec_sld(a, a, 8));

  // quad = { Max(a0, a4, a2, a6), Max(a1, a5, a3, a7) }
  quad = vec_max(pair, vec_sld(pair, pair, 4));

  // octo = { Max(a0, a4, a2, a6, a1, a5, a3, a7) }
  octo = vec_max(quad, vec_sld(quad, quad, 2));
  return pfirst(octo);
}

template <>
EIGEN_STRONG_INLINE signed char predux_max<Packet16c>(const Packet16c& a) {
  Packet16c pair, quad, octo, result;

  pair = vec_max(a, vec_sld(a, a, 8));
  quad = vec_max(pair, vec_sld(pair, pair, 4));
  octo = vec_max(quad, vec_sld(quad, quad, 2));
  result = vec_max(octo, vec_sld(octo, octo, 1));

  return pfirst(result);
}

template <>
EIGEN_STRONG_INLINE unsigned char predux_max<Packet16uc>(const Packet16uc& a) {
  Packet16uc pair, quad, octo, result;

  pair = vec_max(a, vec_sld(a, a, 8));
  quad = vec_max(pair, vec_sld(pair, pair, 4));
  octo = vec_max(quad, vec_sld(quad, quad, 2));
  result = vec_max(octo, vec_sld(octo, octo, 1));

  return pfirst(result);
}

template <>
EIGEN_STRONG_INLINE bool predux_any(const Packet4f& x) {
  return vec_any_ne(x, pzero(x));
}

template <typename T>
EIGEN_DEVICE_FUNC inline void ptranpose_common(PacketBlock<T, 4>& kernel) {
  T t0, t1, t2, t3;
  t0 = vec_mergeh(kernel.packet[0], kernel.packet[2]);
  t1 = vec_mergel(kernel.packet[0], kernel.packet[2]);
  t2 = vec_mergeh(kernel.packet[1], kernel.packet[3]);
  t3 = vec_mergel(kernel.packet[1], kernel.packet[3]);
  kernel.packet[0] = vec_mergeh(t0, t2);
  kernel.packet[1] = vec_mergel(t0, t2);
  kernel.packet[2] = vec_mergeh(t1, t3);
  kernel.packet[3] = vec_mergel(t1, t3);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet4f, 4>& kernel) { ptranpose_common<Packet4f>(kernel); }

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet4i, 4>& kernel) { ptranpose_common<Packet4i>(kernel); }

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet8s, 4>& kernel) {
  Packet8s t0, t1, t2, t3;
  t0 = vec_mergeh(kernel.packet[0], kernel.packet[2]);
  t1 = vec_mergel(kernel.packet[0], kernel.packet[2]);
  t2 = vec_mergeh(kernel.packet[1], kernel.packet[3]);
  t3 = vec_mergel(kernel.packet[1], kernel.packet[3]);
  kernel.packet[0] = vec_mergeh(t0, t2);
  kernel.packet[1] = vec_mergel(t0, t2);
  kernel.packet[2] = vec_mergeh(t1, t3);
  kernel.packet[3] = vec_mergel(t1, t3);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet8us, 4>& kernel) {
  Packet8us t0, t1, t2, t3;
  t0 = vec_mergeh(kernel.packet[0], kernel.packet[2]);
  t1 = vec_mergel(kernel.packet[0], kernel.packet[2]);
  t2 = vec_mergeh(kernel.packet[1], kernel.packet[3]);
  t3 = vec_mergel(kernel.packet[1], kernel.packet[3]);
  kernel.packet[0] = vec_mergeh(t0, t2);
  kernel.packet[1] = vec_mergel(t0, t2);
  kernel.packet[2] = vec_mergeh(t1, t3);
  kernel.packet[3] = vec_mergel(t1, t3);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet8bf, 4>& kernel) {
  Packet8us t0, t1, t2, t3;

  t0 = vec_mergeh(kernel.packet[0].m_val, kernel.packet[2].m_val);
  t1 = vec_mergel(kernel.packet[0].m_val, kernel.packet[2].m_val);
  t2 = vec_mergeh(kernel.packet[1].m_val, kernel.packet[3].m_val);
  t3 = vec_mergel(kernel.packet[1].m_val, kernel.packet[3].m_val);
  kernel.packet[0] = vec_mergeh(t0, t2);
  kernel.packet[1] = vec_mergel(t0, t2);
  kernel.packet[2] = vec_mergeh(t1, t3);
  kernel.packet[3] = vec_mergel(t1, t3);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet16c, 4>& kernel) {
  Packet16c t0, t1, t2, t3;
  t0 = vec_mergeh(kernel.packet[0], kernel.packet[2]);
  t1 = vec_mergel(kernel.packet[0], kernel.packet[2]);
  t2 = vec_mergeh(kernel.packet[1], kernel.packet[3]);
  t3 = vec_mergel(kernel.packet[1], kernel.packet[3]);
  kernel.packet[0] = vec_mergeh(t0, t2);
  kernel.packet[1] = vec_mergel(t0, t2);
  kernel.packet[2] = vec_mergeh(t1, t3);
  kernel.packet[3] = vec_mergel(t1, t3);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet16uc, 4>& kernel) {
  Packet16uc t0, t1, t2, t3;
  t0 = vec_mergeh(kernel.packet[0], kernel.packet[2]);
  t1 = vec_mergel(kernel.packet[0], kernel.packet[2]);
  t2 = vec_mergeh(kernel.packet[1], kernel.packet[3]);
  t3 = vec_mergel(kernel.packet[1], kernel.packet[3]);
  kernel.packet[0] = vec_mergeh(t0, t2);
  kernel.packet[1] = vec_mergel(t0, t2);
  kernel.packet[2] = vec_mergeh(t1, t3);
  kernel.packet[3] = vec_mergel(t1, t3);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet8s, 8>& kernel) {
  Packet8s v[8], sum[8];

  v[0] = vec_mergeh(kernel.packet[0], kernel.packet[4]);
  v[1] = vec_mergel(kernel.packet[0], kernel.packet[4]);
  v[2] = vec_mergeh(kernel.packet[1], kernel.packet[5]);
  v[3] = vec_mergel(kernel.packet[1], kernel.packet[5]);
  v[4] = vec_mergeh(kernel.packet[2], kernel.packet[6]);
  v[5] = vec_mergel(kernel.packet[2], kernel.packet[6]);
  v[6] = vec_mergeh(kernel.packet[3], kernel.packet[7]);
  v[7] = vec_mergel(kernel.packet[3], kernel.packet[7]);
  sum[0] = vec_mergeh(v[0], v[4]);
  sum[1] = vec_mergel(v[0], v[4]);
  sum[2] = vec_mergeh(v[1], v[5]);
  sum[3] = vec_mergel(v[1], v[5]);
  sum[4] = vec_mergeh(v[2], v[6]);
  sum[5] = vec_mergel(v[2], v[6]);
  sum[6] = vec_mergeh(v[3], v[7]);
  sum[7] = vec_mergel(v[3], v[7]);

  kernel.packet[0] = vec_mergeh(sum[0], sum[4]);
  kernel.packet[1] = vec_mergel(sum[0], sum[4]);
  kernel.packet[2] = vec_mergeh(sum[1], sum[5]);
  kernel.packet[3] = vec_mergel(sum[1], sum[5]);
  kernel.packet[4] = vec_mergeh(sum[2], sum[6]);
  kernel.packet[5] = vec_mergel(sum[2], sum[6]);
  kernel.packet[6] = vec_mergeh(sum[3], sum[7]);
  kernel.packet[7] = vec_mergel(sum[3], sum[7]);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet8us, 8>& kernel) {
  Packet8us v[8], sum[8];

  v[0] = vec_mergeh(kernel.packet[0], kernel.packet[4]);
  v[1] = vec_mergel(kernel.packet[0], kernel.packet[4]);
  v[2] = vec_mergeh(kernel.packet[1], kernel.packet[5]);
  v[3] = vec_mergel(kernel.packet[1], kernel.packet[5]);
  v[4] = vec_mergeh(kernel.packet[2], kernel.packet[6]);
  v[5] = vec_mergel(kernel.packet[2], kernel.packet[6]);
  v[6] = vec_mergeh(kernel.packet[3], kernel.packet[7]);
  v[7] = vec_mergel(kernel.packet[3], kernel.packet[7]);
  sum[0] = vec_mergeh(v[0], v[4]);
  sum[1] = vec_mergel(v[0], v[4]);
  sum[2] = vec_mergeh(v[1], v[5]);
  sum[3] = vec_mergel(v[1], v[5]);
  sum[4] = vec_mergeh(v[2], v[6]);
  sum[5] = vec_mergel(v[2], v[6]);
  sum[6] = vec_mergeh(v[3], v[7]);
  sum[7] = vec_mergel(v[3], v[7]);

  kernel.packet[0] = vec_mergeh(sum[0], sum[4]);
  kernel.packet[1] = vec_mergel(sum[0], sum[4]);
  kernel.packet[2] = vec_mergeh(sum[1], sum[5]);
  kernel.packet[3] = vec_mergel(sum[1], sum[5]);
  kernel.packet[4] = vec_mergeh(sum[2], sum[6]);
  kernel.packet[5] = vec_mergel(sum[2], sum[6]);
  kernel.packet[6] = vec_mergeh(sum[3], sum[7]);
  kernel.packet[7] = vec_mergel(sum[3], sum[7]);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet8bf, 8>& kernel) {
  Packet8bf v[8], sum[8];

  v[0] = vec_mergeh(kernel.packet[0].m_val, kernel.packet[4].m_val);
  v[1] = vec_mergel(kernel.packet[0].m_val, kernel.packet[4].m_val);
  v[2] = vec_mergeh(kernel.packet[1].m_val, kernel.packet[5].m_val);
  v[3] = vec_mergel(kernel.packet[1].m_val, kernel.packet[5].m_val);
  v[4] = vec_mergeh(kernel.packet[2].m_val, kernel.packet[6].m_val);
  v[5] = vec_mergel(kernel.packet[2].m_val, kernel.packet[6].m_val);
  v[6] = vec_mergeh(kernel.packet[3].m_val, kernel.packet[7].m_val);
  v[7] = vec_mergel(kernel.packet[3].m_val, kernel.packet[7].m_val);
  sum[0] = vec_mergeh(v[0].m_val, v[4].m_val);
  sum[1] = vec_mergel(v[0].m_val, v[4].m_val);
  sum[2] = vec_mergeh(v[1].m_val, v[5].m_val);
  sum[3] = vec_mergel(v[1].m_val, v[5].m_val);
  sum[4] = vec_mergeh(v[2].m_val, v[6].m_val);
  sum[5] = vec_mergel(v[2].m_val, v[6].m_val);
  sum[6] = vec_mergeh(v[3].m_val, v[7].m_val);
  sum[7] = vec_mergel(v[3].m_val, v[7].m_val);

  kernel.packet[0] = vec_mergeh(sum[0].m_val, sum[4].m_val);
  kernel.packet[1] = vec_mergel(sum[0].m_val, sum[4].m_val);
  kernel.packet[2] = vec_mergeh(sum[1].m_val, sum[5].m_val);
  kernel.packet[3] = vec_mergel(sum[1].m_val, sum[5].m_val);
  kernel.packet[4] = vec_mergeh(sum[2].m_val, sum[6].m_val);
  kernel.packet[5] = vec_mergel(sum[2].m_val, sum[6].m_val);
  kernel.packet[6] = vec_mergeh(sum[3].m_val, sum[7].m_val);
  kernel.packet[7] = vec_mergel(sum[3].m_val, sum[7].m_val);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet16c, 16>& kernel) {
  Packet16c step1[16], step2[16], step3[16];

  step1[0] = vec_mergeh(kernel.packet[0], kernel.packet[8]);
  step1[1] = vec_mergel(kernel.packet[0], kernel.packet[8]);
  step1[2] = vec_mergeh(kernel.packet[1], kernel.packet[9]);
  step1[3] = vec_mergel(kernel.packet[1], kernel.packet[9]);
  step1[4] = vec_mergeh(kernel.packet[2], kernel.packet[10]);
  step1[5] = vec_mergel(kernel.packet[2], kernel.packet[10]);
  step1[6] = vec_mergeh(kernel.packet[3], kernel.packet[11]);
  step1[7] = vec_mergel(kernel.packet[3], kernel.packet[11]);
  step1[8] = vec_mergeh(kernel.packet[4], kernel.packet[12]);
  step1[9] = vec_mergel(kernel.packet[4], kernel.packet[12]);
  step1[10] = vec_mergeh(kernel.packet[5], kernel.packet[13]);
  step1[11] = vec_mergel(kernel.packet[5], kernel.packet[13]);
  step1[12] = vec_mergeh(kernel.packet[6], kernel.packet[14]);
  step1[13] = vec_mergel(kernel.packet[6], kernel.packet[14]);
  step1[14] = vec_mergeh(kernel.packet[7], kernel.packet[15]);
  step1[15] = vec_mergel(kernel.packet[7], kernel.packet[15]);

  step2[0] = vec_mergeh(step1[0], step1[8]);
  step2[1] = vec_mergel(step1[0], step1[8]);
  step2[2] = vec_mergeh(step1[1], step1[9]);
  step2[3] = vec_mergel(step1[1], step1[9]);
  step2[4] = vec_mergeh(step1[2], step1[10]);
  step2[5] = vec_mergel(step1[2], step1[10]);
  step2[6] = vec_mergeh(step1[3], step1[11]);
  step2[7] = vec_mergel(step1[3], step1[11]);
  step2[8] = vec_mergeh(step1[4], step1[12]);
  step2[9] = vec_mergel(step1[4], step1[12]);
  step2[10] = vec_mergeh(step1[5], step1[13]);
  step2[11] = vec_mergel(step1[5], step1[13]);
  step2[12] = vec_mergeh(step1[6], step1[14]);
  step2[13] = vec_mergel(step1[6], step1[14]);
  step2[14] = vec_mergeh(step1[7], step1[15]);
  step2[15] = vec_mergel(step1[7], step1[15]);

  step3[0] = vec_mergeh(step2[0], step2[8]);
  step3[1] = vec_mergel(step2[0], step2[8]);
  step3[2] = vec_mergeh(step2[1], step2[9]);
  step3[3] = vec_mergel(step2[1], step2[9]);
  step3[4] = vec_mergeh(step2[2], step2[10]);
  step3[5] = vec_mergel(step2[2], step2[10]);
  step3[6] = vec_mergeh(step2[3], step2[11]);
  step3[7] = vec_mergel(step2[3], step2[11]);
  step3[8] = vec_mergeh(step2[4], step2[12]);
  step3[9] = vec_mergel(step2[4], step2[12]);
  step3[10] = vec_mergeh(step2[5], step2[13]);
  step3[11] = vec_mergel(step2[5], step2[13]);
  step3[12] = vec_mergeh(step2[6], step2[14]);
  step3[13] = vec_mergel(step2[6], step2[14]);
  step3[14] = vec_mergeh(step2[7], step2[15]);
  step3[15] = vec_mergel(step2[7], step2[15]);

  kernel.packet[0] = vec_mergeh(step3[0], step3[8]);
  kernel.packet[1] = vec_mergel(step3[0], step3[8]);
  kernel.packet[2] = vec_mergeh(step3[1], step3[9]);
  kernel.packet[3] = vec_mergel(step3[1], step3[9]);
  kernel.packet[4] = vec_mergeh(step3[2], step3[10]);
  kernel.packet[5] = vec_mergel(step3[2], step3[10]);
  kernel.packet[6] = vec_mergeh(step3[3], step3[11]);
  kernel.packet[7] = vec_mergel(step3[3], step3[11]);
  kernel.packet[8] = vec_mergeh(step3[4], step3[12]);
  kernel.packet[9] = vec_mergel(step3[4], step3[12]);
  kernel.packet[10] = vec_mergeh(step3[5], step3[13]);
  kernel.packet[11] = vec_mergel(step3[5], step3[13]);
  kernel.packet[12] = vec_mergeh(step3[6], step3[14]);
  kernel.packet[13] = vec_mergel(step3[6], step3[14]);
  kernel.packet[14] = vec_mergeh(step3[7], step3[15]);
  kernel.packet[15] = vec_mergel(step3[7], step3[15]);
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet16uc, 16>& kernel) {
  Packet16uc step1[16], step2[16], step3[16];

  step1[0] = vec_mergeh(kernel.packet[0], kernel.packet[8]);
  step1[1] = vec_mergel(kernel.packet[0], kernel.packet[8]);
  step1[2] = vec_mergeh(kernel.packet[1], kernel.packet[9]);
  step1[3] = vec_mergel(kernel.packet[1], kernel.packet[9]);
  step1[4] = vec_mergeh(kernel.packet[2], kernel.packet[10]);
  step1[5] = vec_mergel(kernel.packet[2], kernel.packet[10]);
  step1[6] = vec_mergeh(kernel.packet[3], kernel.packet[11]);
  step1[7] = vec_mergel(kernel.packet[3], kernel.packet[11]);
  step1[8] = vec_mergeh(kernel.packet[4], kernel.packet[12]);
  step1[9] = vec_mergel(kernel.packet[4], kernel.packet[12]);
  step1[10] = vec_mergeh(kernel.packet[5], kernel.packet[13]);
  step1[11] = vec_mergel(kernel.packet[5], kernel.packet[13]);
  step1[12] = vec_mergeh(kernel.packet[6], kernel.packet[14]);
  step1[13] = vec_mergel(kernel.packet[6], kernel.packet[14]);
  step1[14] = vec_mergeh(kernel.packet[7], kernel.packet[15]);
  step1[15] = vec_mergel(kernel.packet[7], kernel.packet[15]);

  step2[0] = vec_mergeh(step1[0], step1[8]);
  step2[1] = vec_mergel(step1[0], step1[8]);
  step2[2] = vec_mergeh(step1[1], step1[9]);
  step2[3] = vec_mergel(step1[1], step1[9]);
  step2[4] = vec_mergeh(step1[2], step1[10]);
  step2[5] = vec_mergel(step1[2], step1[10]);
  step2[6] = vec_mergeh(step1[3], step1[11]);
  step2[7] = vec_mergel(step1[3], step1[11]);
  step2[8] = vec_mergeh(step1[4], step1[12]);
  step2[9] = vec_mergel(step1[4], step1[12]);
  step2[10] = vec_mergeh(step1[5], step1[13]);
  step2[11] = vec_mergel(step1[5], step1[13]);
  step2[12] = vec_mergeh(step1[6], step1[14]);
  step2[13] = vec_mergel(step1[6], step1[14]);
  step2[14] = vec_mergeh(step1[7], step1[15]);
  step2[15] = vec_mergel(step1[7], step1[15]);

  step3[0] = vec_mergeh(step2[0], step2[8]);
  step3[1] = vec_mergel(step2[0], step2[8]);
  step3[2] = vec_mergeh(step2[1], step2[9]);
  step3[3] = vec_mergel(step2[1], step2[9]);
  step3[4] = vec_mergeh(step2[2], step2[10]);
  step3[5] = vec_mergel(step2[2], step2[10]);
  step3[6] = vec_mergeh(step2[3], step2[11]);
  step3[7] = vec_mergel(step2[3], step2[11]);
  step3[8] = vec_mergeh(step2[4], step2[12]);
  step3[9] = vec_mergel(step2[4], step2[12]);
  step3[10] = vec_mergeh(step2[5], step2[13]);
  step3[11] = vec_mergel(step2[5], step2[13]);
  step3[12] = vec_mergeh(step2[6], step2[14]);
  step3[13] = vec_mergel(step2[6], step2[14]);
  step3[14] = vec_mergeh(step2[7], step2[15]);
  step3[15] = vec_mergel(step2[7], step2[15]);

  kernel.packet[0] = vec_mergeh(step3[0], step3[8]);
  kernel.packet[1] = vec_mergel(step3[0], step3[8]);
  kernel.packet[2] = vec_mergeh(step3[1], step3[9]);
  kernel.packet[3] = vec_mergel(step3[1], step3[9]);
  kernel.packet[4] = vec_mergeh(step3[2], step3[10]);
  kernel.packet[5] = vec_mergel(step3[2], step3[10]);
  kernel.packet[6] = vec_mergeh(step3[3], step3[11]);
  kernel.packet[7] = vec_mergel(step3[3], step3[11]);
  kernel.packet[8] = vec_mergeh(step3[4], step3[12]);
  kernel.packet[9] = vec_mergel(step3[4], step3[12]);
  kernel.packet[10] = vec_mergeh(step3[5], step3[13]);
  kernel.packet[11] = vec_mergel(step3[5], step3[13]);
  kernel.packet[12] = vec_mergeh(step3[6], step3[14]);
  kernel.packet[13] = vec_mergel(step3[6], step3[14]);
  kernel.packet[14] = vec_mergeh(step3[7], step3[15]);
  kernel.packet[15] = vec_mergel(step3[7], step3[15]);
}

template <typename Packet>
EIGEN_STRONG_INLINE Packet pblend4(const Selector<4>& ifPacket, const Packet& thenPacket, const Packet& elsePacket) {
  Packet4ui select = {ifPacket.select[0], ifPacket.select[1], ifPacket.select[2], ifPacket.select[3]};
  Packet4ui mask = reinterpret_cast<Packet4ui>(pnegate(reinterpret_cast<Packet4i>(select)));
  return vec_sel(elsePacket, thenPacket, mask);
}

template <>
EIGEN_STRONG_INLINE Packet4i pblend(const Selector<4>& ifPacket, const Packet4i& thenPacket,
                                    const Packet4i& elsePacket) {
  return pblend4<Packet4i>(ifPacket, thenPacket, elsePacket);
}

template <>
EIGEN_STRONG_INLINE Packet4f pblend(const Selector<4>& ifPacket, const Packet4f& thenPacket,
                                    const Packet4f& elsePacket) {
  return pblend4<Packet4f>(ifPacket, thenPacket, elsePacket);
}

template <>
EIGEN_STRONG_INLINE Packet8s pblend(const Selector<8>& ifPacket, const Packet8s& thenPacket,
                                    const Packet8s& elsePacket) {
  Packet8us select = {ifPacket.select[0], ifPacket.select[1], ifPacket.select[2], ifPacket.select[3],
                      ifPacket.select[4], ifPacket.select[5], ifPacket.select[6], ifPacket.select[7]};
  Packet8us mask = reinterpret_cast<Packet8us>(pnegate(reinterpret_cast<Packet8s>(select)));
  Packet8s result = vec_sel(elsePacket, thenPacket, mask);
  return result;
}

template <>
EIGEN_STRONG_INLINE Packet8us pblend(const Selector<8>& ifPacket, const Packet8us& thenPacket,
                                     const Packet8us& elsePacket) {
  Packet8us select = {ifPacket.select[0], ifPacket.select[1], ifPacket.select[2], ifPacket.select[3],
                      ifPacket.select[4], ifPacket.select[5], ifPacket.select[6], ifPacket.select[7]};
  Packet8us mask = reinterpret_cast<Packet8us>(pnegate(reinterpret_cast<Packet8s>(select)));
  return vec_sel(elsePacket, thenPacket, mask);
}

template <>
EIGEN_STRONG_INLINE Packet8bf pblend(const Selector<8>& ifPacket, const Packet8bf& thenPacket,
                                     const Packet8bf& elsePacket) {
  return pblend<Packet8us>(ifPacket, thenPacket, elsePacket);
}

template <>
EIGEN_STRONG_INLINE Packet16c pblend(const Selector<16>& ifPacket, const Packet16c& thenPacket,
                                     const Packet16c& elsePacket) {
  Packet16uc select = {ifPacket.select[0],  ifPacket.select[1],  ifPacket.select[2],  ifPacket.select[3],
                       ifPacket.select[4],  ifPacket.select[5],  ifPacket.select[6],  ifPacket.select[7],
                       ifPacket.select[8],  ifPacket.select[9],  ifPacket.select[10], ifPacket.select[11],
                       ifPacket.select[12], ifPacket.select[13], ifPacket.select[14], ifPacket.select[15]};

  Packet16uc mask = reinterpret_cast<Packet16uc>(pnegate(reinterpret_cast<Packet16c>(select)));
  return vec_sel(elsePacket, thenPacket, mask);
}

template <>
EIGEN_STRONG_INLINE Packet16uc pblend(const Selector<16>& ifPacket, const Packet16uc& thenPacket,
                                      const Packet16uc& elsePacket) {
  Packet16uc select = {ifPacket.select[0],  ifPacket.select[1],  ifPacket.select[2],  ifPacket.select[3],
                       ifPacket.select[4],  ifPacket.select[5],  ifPacket.select[6],  ifPacket.select[7],
                       ifPacket.select[8],  ifPacket.select[9],  ifPacket.select[10], ifPacket.select[11],
                       ifPacket.select[12], ifPacket.select[13], ifPacket.select[14], ifPacket.select[15]};

  Packet16uc mask = reinterpret_cast<Packet16uc>(pnegate(reinterpret_cast<Packet16c>(select)));
  return vec_sel(elsePacket, thenPacket, mask);
}

//---------- double ----------
#ifdef EIGEN_VECTORIZE_VSX
typedef __vector double Packet2d;
typedef __vector unsigned long long Packet2ul;
typedef __vector long long Packet2l;
#if EIGEN_COMP_CLANG
typedef Packet2ul Packet2bl;
#else
typedef __vector __bool long Packet2bl;
#endif

static Packet2l p2l_ZERO = reinterpret_cast<Packet2l>(p4i_ZERO);
static Packet2ul p2ul_SIGN = {0x8000000000000000ull, 0x8000000000000000ull};
static Packet2ul p2ul_PREV0DOT5 = {0x3FDFFFFFFFFFFFFFull, 0x3FDFFFFFFFFFFFFFull};
static Packet2d p2d_ONE = {1.0, 1.0};
static Packet2d p2d_ZERO = reinterpret_cast<Packet2d>(p4f_ZERO);
static Packet2d p2d_MZERO = {numext::bit_cast<double>(0x8000000000000000ull),
                             numext::bit_cast<double>(0x8000000000000000ull)};

#ifdef _BIG_ENDIAN
static Packet2d p2d_COUNTDOWN =
    reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4f>(p2d_ZERO), reinterpret_cast<Packet4f>(p2d_ONE), 8));
#else
static Packet2d p2d_COUNTDOWN =
    reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4f>(p2d_ONE), reinterpret_cast<Packet4f>(p2d_ZERO), 8));
#endif

template <int index>
Packet2d vec_splat_dbl(Packet2d& a) {
  return vec_splat(a, index);
}

template <>
struct packet_traits<double> : default_packet_traits {
  typedef Packet2d type;
  typedef Packet2d half;
  enum {
    Vectorizable = 1,
    AlignedOnScalar = 1,
    size = 2,

    HasAdd = 1,
    HasSub = 1,
    HasMul = 1,
    HasDiv = 1,
    HasMin = 1,
    HasMax = 1,
    HasAbs = 1,
    HasSin = EIGEN_FAST_MATH,
    HasCos = EIGEN_FAST_MATH,
    HasTanh = EIGEN_FAST_MATH,
    HasErf = EIGEN_FAST_MATH,
    HasErfc = EIGEN_FAST_MATH,
    HasATanh = 1,
    HasATan = 0,
    HasLog = 0,
    HasExp = 1,
    HasSqrt = 1,
#if !EIGEN_COMP_CLANG
    HasRsqrt = 1,
#else
    HasRsqrt = 0,
#endif
    HasNegate = 1,
    HasBlend = 1
  };
};

template <>
struct unpacket_traits<Packet2d> {
  typedef double type;
  typedef Packet2l integer_packet;
  enum {
    size = 2,
    alignment = Aligned16,
    vectorizable = true,
    masked_load_available = false,
    masked_store_available = false
  };
  typedef Packet2d half;
};
template <>
struct unpacket_traits<Packet2l> {
  typedef int64_t type;
  typedef Packet2l half;
  enum {
    size = 2,
    alignment = Aligned16,
    vectorizable = false,
    masked_load_available = false,
    masked_store_available = false
  };
};

inline std::ostream& operator<<(std::ostream& s, const Packet2l& v) {
  union {
    Packet2l v;
    int64_t n[2];
  } vt;
  vt.v = v;
  s << vt.n[0] << ", " << vt.n[1];
  return s;
}

inline std::ostream& operator<<(std::ostream& s, const Packet2d& v) {
  union {
    Packet2d v;
    double n[2];
  } vt;
  vt.v = v;
  s << vt.n[0] << ", " << vt.n[1];
  return s;
}

// Need to define them first or we get specialization after instantiation errors
template <>
EIGEN_STRONG_INLINE Packet2d pload<Packet2d>(const double* from) {
  EIGEN_DEBUG_ALIGNED_LOAD
  return vec_xl(0, const_cast<double*>(from));  // cast needed by Clang
}

template <>
EIGEN_ALWAYS_INLINE Packet2d pload_partial<Packet2d>(const double* from, const Index n, const Index offset) {
  return pload_partial_common<Packet2d>(from, n, offset);
}

template <>
EIGEN_STRONG_INLINE void pstore<double>(double* to, const Packet2d& from) {
  EIGEN_DEBUG_ALIGNED_STORE
  vec_xst(from, 0, to);
}

template <>
EIGEN_ALWAYS_INLINE void pstore_partial<double>(double* to, const Packet2d& from, const Index n, const Index offset) {
  pstore_partial_common<Packet2d>(to, from, n, offset);
}

template <>
EIGEN_STRONG_INLINE Packet2d pset1<Packet2d>(const double& from) {
  Packet2d v = {from, from};
  return v;
}
template <>
EIGEN_STRONG_INLINE Packet2l pset1<Packet2l>(const int64_t& from) {
  Packet2l v = {from, from};
  return v;
}

template <>
EIGEN_STRONG_INLINE Packet2d pset1frombits<Packet2d>(unsigned long from) {
  Packet2l v = {static_cast<long long>(from), static_cast<long long>(from)};
  return reinterpret_cast<Packet2d>(v);
}

template <>
EIGEN_STRONG_INLINE void pbroadcast4<Packet2d>(const double* a, Packet2d& a0, Packet2d& a1, Packet2d& a2,
                                               Packet2d& a3) {
  // This way is faster than vec_splat (at least for doubles in Power 9)
  a0 = pset1<Packet2d>(a[0]);
  a1 = pset1<Packet2d>(a[1]);
  a2 = pset1<Packet2d>(a[2]);
  a3 = pset1<Packet2d>(a[3]);
}

template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet2d pgather<double, Packet2d>(const double* from, Index stride) {
  return pgather_common<Packet2d>(from, stride);
}
template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet2d pgather_partial<double, Packet2d>(const double* from, Index stride,
                                                                                 const Index n) {
  return pgather_common<Packet2d>(from, stride, n);
}
template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter<double, Packet2d>(double* to, const Packet2d& from, Index stride) {
  pscatter_common<Packet2d>(to, from, stride);
}
template <>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pscatter_partial<double, Packet2d>(double* to, const Packet2d& from,
                                                                              Index stride, const Index n) {
  pscatter_common<Packet2d>(to, from, stride, n);
}

template <>
EIGEN_STRONG_INLINE Packet2d plset<Packet2d>(const double& a) {
  return pset1<Packet2d>(a) + p2d_COUNTDOWN;
}

template <>
EIGEN_STRONG_INLINE Packet2d padd<Packet2d>(const Packet2d& a, const Packet2d& b) {
  return a + b;
}

template <>
EIGEN_STRONG_INLINE Packet2d psub<Packet2d>(const Packet2d& a, const Packet2d& b) {
  return a - b;
}

template <>
EIGEN_STRONG_INLINE Packet2d pnegate(const Packet2d& a) {
#ifdef __POWER8_VECTOR__
  return vec_neg(a);
#else
  return vec_xor(a, p2d_MZERO);
#endif
}

template <>
EIGEN_STRONG_INLINE Packet2d pconj(const Packet2d& a) {
  return a;
}

template <>
EIGEN_STRONG_INLINE Packet2d pmul<Packet2d>(const Packet2d& a, const Packet2d& b) {
  return vec_madd(a, b, p2d_MZERO);
}
template <>
EIGEN_STRONG_INLINE Packet2d pdiv<Packet2d>(const Packet2d& a, const Packet2d& b) {
  return vec_div(a, b);
}

// for some weird raisons, it has to be overloaded for packet of integers
template <>
EIGEN_STRONG_INLINE Packet2d pmadd(const Packet2d& a, const Packet2d& b, const Packet2d& c) {
  return vec_madd(a, b, c);
}
template <>
EIGEN_STRONG_INLINE Packet2d pmsub(const Packet2d& a, const Packet2d& b, const Packet2d& c) {
  return vec_msub(a, b, c);
}
template <>
EIGEN_STRONG_INLINE Packet2d pnmadd(const Packet2d& a, const Packet2d& b, const Packet2d& c) {
  return vec_nmsub(a, b, c);
}
template <>
EIGEN_STRONG_INLINE Packet2d pnmsub(const Packet2d& a, const Packet2d& b, const Packet2d& c) {
  return vec_nmadd(a, b, c);
}

template <>
EIGEN_STRONG_INLINE Packet2d pmin<Packet2d>(const Packet2d& a, const Packet2d& b) {
  // NOTE: about 10% slower than vec_min, but consistent with std::min and SSE regarding NaN
  Packet2d ret;
  __asm__("xvcmpgedp %x0,%x1,%x2\n\txxsel %x0,%x1,%x2,%x0" : "=&wa"(ret) : "wa"(a), "wa"(b));
  return ret;
}

template <>
EIGEN_STRONG_INLINE Packet2d pmax<Packet2d>(const Packet2d& a, const Packet2d& b) {
  // NOTE: about 10% slower than vec_max, but consistent with std::max and SSE regarding NaN
  Packet2d ret;
  __asm__("xvcmpgtdp %x0,%x2,%x1\n\txxsel %x0,%x1,%x2,%x0" : "=&wa"(ret) : "wa"(a), "wa"(b));
  return ret;
}

template <>
EIGEN_STRONG_INLINE Packet2d pcmp_le(const Packet2d& a, const Packet2d& b) {
  return reinterpret_cast<Packet2d>(vec_cmple(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet2d pcmp_lt(const Packet2d& a, const Packet2d& b) {
  return reinterpret_cast<Packet2d>(vec_cmplt(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet2d pcmp_eq(const Packet2d& a, const Packet2d& b) {
  return reinterpret_cast<Packet2d>(vec_cmpeq(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet2l pcmp_eq(const Packet2l& a, const Packet2l& b) {
  return reinterpret_cast<Packet2l>(vec_cmpeq(a, b));
}
template <>
EIGEN_STRONG_INLINE Packet2d pcmp_lt_or_nan(const Packet2d& a, const Packet2d& b) {
  Packet2d c = reinterpret_cast<Packet2d>(vec_cmpge(a, b));
  return vec_nor(c, c);
}

template <>
EIGEN_STRONG_INLINE Packet2d pand<Packet2d>(const Packet2d& a, const Packet2d& b) {
  return vec_and(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet2d por<Packet2d>(const Packet2d& a, const Packet2d& b) {
  return vec_or(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet2d pxor<Packet2d>(const Packet2d& a, const Packet2d& b) {
  return vec_xor(a, b);
}

template <>
EIGEN_STRONG_INLINE Packet2d pandnot<Packet2d>(const Packet2d& a, const Packet2d& b) {
  return vec_and(a, vec_nor(b, b));
}

template <>
EIGEN_STRONG_INLINE Packet2d pround<Packet2d>(const Packet2d& a) {
  Packet2d t = vec_add(
      reinterpret_cast<Packet2d>(vec_or(vec_and(reinterpret_cast<Packet2ul>(a), p2ul_SIGN), p2ul_PREV0DOT5)), a);
  Packet2d res;

  __asm__("xvrdpiz %x0, %x1\n\t" : "=&wa"(res) : "wa"(t));

  return res;
}
template <>
EIGEN_STRONG_INLINE Packet2d pceil<Packet2d>(const Packet2d& a) {
  return vec_ceil(a);
}
template <>
EIGEN_STRONG_INLINE Packet2d pfloor<Packet2d>(const Packet2d& a) {
  return vec_floor(a);
}
template <>
EIGEN_STRONG_INLINE Packet2d ptrunc<Packet2d>(const Packet2d& a) {
  return vec_trunc(a);
}
template <>
EIGEN_STRONG_INLINE Packet2d print<Packet2d>(const Packet2d& a) {
  Packet2d res;

  __asm__("xvrdpic %x0, %x1\n\t" : "=&wa"(res) : "wa"(a));

  return res;
}

template <>
EIGEN_STRONG_INLINE Packet2d ploadu<Packet2d>(const double* from) {
  EIGEN_DEBUG_UNALIGNED_LOAD
  return vec_xl(0, const_cast<double*>(from));
}

template <>
EIGEN_ALWAYS_INLINE Packet2d ploadu_partial<Packet2d>(const double* from, const Index n, const Index offset) {
  return ploadu_partial_common<Packet2d>(from, n, offset);
}

template <>
EIGEN_STRONG_INLINE Packet2d ploaddup<Packet2d>(const double* from) {
  Packet2d p;
  if ((std::ptrdiff_t(from) % 16) == 0)
    p = pload<Packet2d>(from);
  else
    p = ploadu<Packet2d>(from);
  return vec_splat_dbl<0>(p);
}

template <>
EIGEN_STRONG_INLINE void pstoreu<double>(double* to, const Packet2d& from) {
  EIGEN_DEBUG_UNALIGNED_STORE
  vec_xst(from, 0, to);
}

template <>
EIGEN_ALWAYS_INLINE void pstoreu_partial<double>(double* to, const Packet2d& from, const Index n, const Index offset) {
  pstoreu_partial_common<Packet2d>(to, from, n, offset);
}

template <>
EIGEN_STRONG_INLINE void prefetch<double>(const double* addr) {
  EIGEN_PPC_PREFETCH(addr);
}

template <>
EIGEN_STRONG_INLINE double pfirst<Packet2d>(const Packet2d& a) {
  EIGEN_ALIGN16 double x[2];
  pstore<double>(x, a);
  return x[0];
}

template <>
EIGEN_STRONG_INLINE Packet2d preverse(const Packet2d& a) {
  return vec_sld(a, a, 8);
}
template <>
EIGEN_STRONG_INLINE Packet2d pabs(const Packet2d& a) {
  return vec_abs(a);
}
#ifdef __POWER8_VECTOR__
template <>
EIGEN_STRONG_INLINE Packet2d psignbit(const Packet2d& a) {
  return (Packet2d)vec_sra((Packet2l)a, vec_splats((unsigned long long)(63)));
}
#else
#ifdef _BIG_ENDIAN
static Packet16uc p16uc_DUPSIGN = {0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8};
#else
static Packet16uc p16uc_DUPSIGN = {7, 7, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15, 15, 15};
#endif

template <>
EIGEN_STRONG_INLINE Packet2d psignbit(const Packet2d& a) {
  Packet16c tmp = vec_sra(reinterpret_cast<Packet16c>(a), vec_splats((unsigned char)(7)));
  return reinterpret_cast<Packet2d>(vec_perm(tmp, tmp, p16uc_DUPSIGN));
}
#endif

template <>
inline Packet2l pcast<Packet2d, Packet2l>(const Packet2d& x);

template <>
inline Packet2d pcast<Packet2l, Packet2d>(const Packet2l& x);

// Packet2l shifts.
// For POWER8 we simply use vec_sr/l.
//
// Things are more complicated for POWER7. There is actually a
// vec_xxsxdi intrinsic but it is not supported by some gcc versions.
// So we need to shift by N % 32 and rearrage bytes.
#ifdef __POWER8_VECTOR__

template <int N>
EIGEN_STRONG_INLINE Packet2l plogical_shift_left(const Packet2l& a) {
  const Packet2ul shift = {N, N};
  return vec_sl(a, shift);
}

template <int N>
EIGEN_STRONG_INLINE Packet2l plogical_shift_right(const Packet2l& a) {
  const Packet2ul shift = {N, N};
  return vec_sr(a, shift);
}

#else

// Shifts [A, B, C, D] to [B, 0, D, 0].
// Used to implement left shifts for Packet2l.
EIGEN_ALWAYS_INLINE Packet4i shift_even_left(const Packet4i& a) {
  static const Packet16uc perm = {0x14, 0x15, 0x16, 0x17, 0x00, 0x01, 0x02, 0x03,
                                  0x1c, 0x1d, 0x1e, 0x1f, 0x08, 0x09, 0x0a, 0x0b};
#ifdef _BIG_ENDIAN
  return vec_perm(p4i_ZERO, a, perm);
#else
  return vec_perm(a, p4i_ZERO, perm);
#endif
}

// Shifts [A, B, C, D] to [0, A, 0, C].
// Used to implement right shifts for Packet2l.
EIGEN_ALWAYS_INLINE Packet4i shift_odd_right(const Packet4i& a) {
  static const Packet16uc perm = {0x04, 0x05, 0x06, 0x07, 0x10, 0x11, 0x12, 0x13,
                                  0x0c, 0x0d, 0x0e, 0x0f, 0x18, 0x19, 0x1a, 0x1b};
#ifdef _BIG_ENDIAN
  return vec_perm(p4i_ZERO, a, perm);
#else
  return vec_perm(a, p4i_ZERO, perm);
#endif
}

template <int N, typename EnableIf = void>
struct plogical_shift_left_impl;

template <int N>
struct plogical_shift_left_impl<N, std::enable_if_t<(N < 32) && (N >= 0)> > {
  static EIGEN_STRONG_INLINE Packet2l run(const Packet2l& a) {
    static const unsigned n = static_cast<unsigned>(N);
    const Packet4ui shift = {n, n, n, n};
    const Packet4i ai = reinterpret_cast<Packet4i>(a);
    static const unsigned m = static_cast<unsigned>(32 - N);
    const Packet4ui shift_right = {m, m, m, m};
    const Packet4i out_hi = vec_sl(ai, shift);
    const Packet4i out_lo = shift_even_left(vec_sr(ai, shift_right));
    return reinterpret_cast<Packet2l>(por<Packet4i>(out_hi, out_lo));
  }
};

template <int N>
struct plogical_shift_left_impl<N, std::enable_if_t<(N >= 32)> > {
  static EIGEN_STRONG_INLINE Packet2l run(const Packet2l& a) {
    static const unsigned m = static_cast<unsigned>(N - 32);
    const Packet4ui shift = {m, m, m, m};
    const Packet4i ai = reinterpret_cast<Packet4i>(a);
    return reinterpret_cast<Packet2l>(shift_even_left(vec_sl(ai, shift)));
  }
};

template <int N>
EIGEN_STRONG_INLINE Packet2l plogical_shift_left(const Packet2l& a) {
  return plogical_shift_left_impl<N>::run(a);
}

template <int N, typename EnableIf = void>
struct plogical_shift_right_impl;

template <int N>
struct plogical_shift_right_impl<N, std::enable_if_t<(N < 32) && (N >= 0)> > {
  static EIGEN_STRONG_INLINE Packet2l run(const Packet2l& a) {
    static const unsigned n = static_cast<unsigned>(N);
    const Packet4ui shift = {n, n, n, n};
    const Packet4i ai = reinterpret_cast<Packet4i>(a);
    static const unsigned m = static_cast<unsigned>(32 - N);
    const Packet4ui shift_left = {m, m, m, m};
    const Packet4i out_lo = vec_sr(ai, shift);
    const Packet4i out_hi = shift_odd_right(vec_sl(ai, shift_left));
    return reinterpret_cast<Packet2l>(por<Packet4i>(out_hi, out_lo));
  }
};

template <int N>
struct plogical_shift_right_impl<N, std::enable_if_t<(N >= 32)> > {
  static EIGEN_STRONG_INLINE Packet2l run(const Packet2l& a) {
    static const unsigned m = static_cast<unsigned>(N - 32);
    const Packet4ui shift = {m, m, m, m};
    const Packet4i ai = reinterpret_cast<Packet4i>(a);
    return reinterpret_cast<Packet2l>(shift_odd_right(vec_sr(ai, shift)));
  }
};

template <int N>
EIGEN_STRONG_INLINE Packet2l plogical_shift_right(const Packet2l& a) {
  return plogical_shift_right_impl<N>::run(a);
}
#endif

template <>
EIGEN_STRONG_INLINE Packet2d pldexp<Packet2d>(const Packet2d& a, const Packet2d& exponent) {
  // Clamp exponent to [-2099, 2099]
  const Packet2d max_exponent = pset1<Packet2d>(2099.0);
  const Packet2l e = pcast<Packet2d, Packet2l>(pmin(pmax(exponent, pnegate(max_exponent)), max_exponent));

  // Split 2^e into four factors and multiply:
  const Packet2l bias = {1023, 1023};
  Packet2l b = plogical_shift_right<2>(e);  // floor(e/4)
  Packet2d c = reinterpret_cast<Packet2d>(plogical_shift_left<52>(b + bias));
  Packet2d out = pmul(pmul(pmul(a, c), c), c);                        // a * 2^(3b)
  b = psub(psub(psub(e, b), b), b);                                   // e - 3b
  c = reinterpret_cast<Packet2d>(plogical_shift_left<52>(b + bias));  // 2^(e - 3b)
  out = pmul(out, c);                                                 // a * 2^e
  return out;
}

// Extract exponent without existence of Packet2l.
template <>
EIGEN_STRONG_INLINE Packet2d pfrexp_generic_get_biased_exponent(const Packet2d& a) {
  return pcast<Packet2l, Packet2d>(plogical_shift_right<52>(reinterpret_cast<Packet2l>(pabs(a))));
}

template <>
EIGEN_STRONG_INLINE Packet2d pfrexp<Packet2d>(const Packet2d& a, Packet2d& exponent) {
  return pfrexp_generic(a, exponent);
}

template <>
EIGEN_STRONG_INLINE double predux<Packet2d>(const Packet2d& a) {
  Packet2d b, sum;
  b = reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4f>(a), reinterpret_cast<Packet4f>(a), 8));
  sum = a + b;
  return pfirst<Packet2d>(sum);
}

// Other reduction functions:
// mul
template <>
EIGEN_STRONG_INLINE double predux_mul<Packet2d>(const Packet2d& a) {
  return pfirst(
      pmul(a, reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4ui>(a), reinterpret_cast<Packet4ui>(a), 8))));
}

// min
template <>
EIGEN_STRONG_INLINE double predux_min<Packet2d>(const Packet2d& a) {
  return pfirst(
      pmin(a, reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4ui>(a), reinterpret_cast<Packet4ui>(a), 8))));
}

// max
template <>
EIGEN_STRONG_INLINE double predux_max<Packet2d>(const Packet2d& a) {
  return pfirst(
      pmax(a, reinterpret_cast<Packet2d>(vec_sld(reinterpret_cast<Packet4ui>(a), reinterpret_cast<Packet4ui>(a), 8))));
}

EIGEN_DEVICE_FUNC inline void ptranspose(PacketBlock<Packet2d, 2>& kernel) {
  Packet2d t0, t1;
  t0 = vec_mergeh(kernel.packet[0], kernel.packet[1]);
  t1 = vec_mergel(kernel.packet[0], kernel.packet[1]);
  kernel.packet[0] = t0;
  kernel.packet[1] = t1;
}

template <>
EIGEN_STRONG_INLINE Packet2d pblend(const Selector<2>& ifPacket, const Packet2d& thenPacket,
                                    const Packet2d& elsePacket) {
  Packet2l select = {ifPacket.select[0], ifPacket.select[1]};
  Packet2ul mask = reinterpret_cast<Packet2ul>(pnegate(reinterpret_cast<Packet2l>(select)));
  return vec_sel(elsePacket, thenPacket, mask);
}

#endif  // __VSX__
}  // end namespace internal

}  // end namespace Eigen

#endif  // EIGEN_PACKET_MATH_ALTIVEC_H
