text: // speck-simd.cpp - written and placed in the public domain by Jeffrey Walton
  //
  //    This source file uses intrinsics and built-ins to gain access to
  //    SSSE3, ARM NEON and ARMv8a, and Power7 Altivec instructions. A separate
  //    source file is needed because additional CXXFLAGS are required to enable
  //    the appropriate instructions sets in some build configurations.
  
  #include "pch.h"
  #include "config.h"
  
  #include "speck.h"
  #include "misc.h"
  #include "adv-simd.h"
  
  // Uncomment for benchmarking C++ against SSE or NEON.
  // Do so in both speck.cpp and speck-simd.cpp.
  // #undef CRYPTOPP_SSSE3_AVAILABLE
  // #undef CRYPTOPP_ARM_NEON_AVAILABLE
  
  #if (CRYPTOPP_SSSE3_AVAILABLE)
  # include <pmmintrin.h>
  # include <tmmintrin.h>
  #endif
  
  #if defined(__AVX512F__) && defined(__AVX512VL__)
  # define CRYPTOPP_AVX512_ROTATE 1
  # include <immintrin.h>
  #endif
  
  #if (CRYPTOPP_ARM_NEON_AVAILABLE)
  # include <arm_neon.h>
  #endif
  
  // Can't use CRYPTOPP_ARM_XXX_AVAILABLE because too many
  // compilers don't follow ACLE conventions for the include.
  #if defined(CRYPTOPP_ARM_ACLE_AVAILABLE)
  # include <stdint.h>
  # include <arm_acle.h>
  #endif
  
  #if defined(CRYPTOPP_POWER7_AVAILABLE)
  # include "ppc-simd.h"
  #endif
  
  // Squash MS LNK4221 and libtool warnings
  extern const char SPECK128_SIMD_FNAME[] = __FILE__;
  
  ANONYMOUS_NAMESPACE_BEGIN
  
  using CryptoPP::byte;
  using CryptoPP::word32;
  using CryptoPP::word64;
  
  // *************************** ARM NEON ************************** //
  
  #if (CRYPTOPP_ARM_NEON_AVAILABLE)
  
  template <class T>
  inline T UnpackHigh64(const T& a, const T& b)
  {
      const uint64x1_t x(vget_high_u64((uint64x2_t)a));
      const uint64x1_t y(vget_high_u64((uint64x2_t)b));
      return (T)vcombine_u64(x, y);
  }
  
  template <class T>
  inline T UnpackLow64(const T& a, const T& b)
  {
      const uint64x1_t x(vget_low_u64((uint64x2_t)a));
      const uint64x1_t y(vget_low_u64((uint64x2_t)b));
      return (T)vcombine_u64(x, y);
  }
  
  template <unsigned int R>
  inline uint64x2_t RotateLeft64(const uint64x2_t& val)
  {
      const uint64x2_t a(vshlq_n_u64(val, R));
      const uint64x2_t b(vshrq_n_u64(val, 64 - R));
      return vorrq_u64(a, b);
  }
  
  template <unsigned int R>
  inline uint64x2_t RotateRight64(const uint64x2_t& val)
  {
      const uint64x2_t a(vshlq_n_u64(val, 64 - R));
      const uint64x2_t b(vshrq_n_u64(val, R));
      return vorrq_u64(a, b);
  }
  
  #if defined(__aarch32__) || defined(__aarch64__)
  // Faster than two Shifts and an Or. Thanks to Louis Wingers and Bryan Weeks.
  template <>
  inline uint64x2_t RotateLeft64<8>(const uint64x2_t& val)
  {
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8_t maskb[16] = { 14,13,12,11, 10,9,8,15, 6,5,4,3, 2,1,0,7 };
      const uint8x16_t mask = vld1q_u8(maskb);
  #else
      const uint8_t maskb[16] = { 7,0,1,2, 3,4,5,6, 15,8,9,10, 11,12,13,14 };
      const uint8x16_t mask = vld1q_u8(maskb);
  #endif
  
      return vreinterpretq_u64_u8(
          vqtbl1q_u8(vreinterpretq_u8_u64(val), mask));
  }
  
  // Faster than two Shifts and an Or. Thanks to Louis Wingers and Bryan Weeks.
  template <>
  inline uint64x2_t RotateRight64<8>(const uint64x2_t& val)
  {
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8_t maskb[16] = { 8,15,14,13, 12,11,10,9, 0,7,6,5, 4,3,2,1 };
      const uint8x16_t mask = vld1q_u8(maskb);
  #else
      const uint8_t maskb[16] = { 1,2,3,4, 5,6,7,0, 9,10,11,12, 13,14,15,8 };
      const uint8x16_t mask = vld1q_u8(maskb);
  #endif
  
      return vreinterpretq_u64_u8(
          vqtbl1q_u8(vreinterpretq_u8_u64(val), mask));
  }
  #endif
  
  inline void SPECK128_Enc_Block(uint64x2_t &block0, uint64x2_t &block1,
      const word64 *subkeys, unsigned int rounds)
  {
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      uint64x2_t x1 = UnpackHigh64(block0, block1);
      uint64x2_t y1 = UnpackLow64(block0, block1);
  
      for (int i=0; i < static_cast<int>(rounds); ++i)
      {
          const uint64x2_t rk = vld1q_dup_u64(subkeys+i);
  
          x1 = RotateRight64<8>(x1);
          x1 = vaddq_u64(x1, y1);
          x1 = veorq_u64(x1, rk);
          y1 = RotateLeft64<3>(y1);
          y1 = veorq_u64(y1, x1);
      }
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = UnpackLow64(y1, x1);
      block1 = UnpackHigh64(y1, x1);
  }
  
  inline void SPECK128_Enc_6_Blocks(uint64x2_t &block0, uint64x2_t &block1,
      uint64x2_t &block2, uint64x2_t &block3, uint64x2_t &block4, uint64x2_t &block5,
      const word64 *subkeys, unsigned int rounds)
  {
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      uint64x2_t x1 = UnpackHigh64(block0, block1);
      uint64x2_t y1 = UnpackLow64(block0, block1);
      uint64x2_t x2 = UnpackHigh64(block2, block3);
      uint64x2_t y2 = UnpackLow64(block2, block3);
      uint64x2_t x3 = UnpackHigh64(block4, block5);
      uint64x2_t y3 = UnpackLow64(block4, block5);
  
      for (int i=0; i < static_cast<int>(rounds); ++i)
      {
          const uint64x2_t rk = vld1q_dup_u64(subkeys+i);
  
          x1 = RotateRight64<8>(x1);
          x2 = RotateRight64<8>(x2);
          x3 = RotateRight64<8>(x3);
          x1 = vaddq_u64(x1, y1);
          x2 = vaddq_u64(x2, y2);
          x3 = vaddq_u64(x3, y3);
          x1 = veorq_u64(x1, rk);
          x2 = veorq_u64(x2, rk);
          x3 = veorq_u64(x3, rk);
          y1 = RotateLeft64<3>(y1);
          y2 = RotateLeft64<3>(y2);
          y3 = RotateLeft64<3>(y3);
          y1 = veorq_u64(y1, x1);
          y2 = veorq_u64(y2, x2);
          y3 = veorq_u64(y3, x3);
      }
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = UnpackLow64(y1, x1);
      block1 = UnpackHigh64(y1, x1);
      block2 = UnpackLow64(y2, x2);
      block3 = UnpackHigh64(y2, x2);
      block4 = UnpackLow64(y3, x3);
      block5 = UnpackHigh64(y3, x3);
  }
  
  inline void SPECK128_Dec_Block(uint64x2_t &block0, uint64x2_t &block1,
      const word64 *subkeys, unsigned int rounds)
  {
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      uint64x2_t x1 = UnpackHigh64(block0, block1);
      uint64x2_t y1 = UnpackLow64(block0, block1);
  
      for (int i = static_cast<int>(rounds-1); i >= 0; --i)
      {
          const uint64x2_t rk = vld1q_dup_u64(subkeys+i);
  
          y1 = veorq_u64(y1, x1);
          y1 = RotateRight64<3>(y1);
          x1 = veorq_u64(x1, rk);
          x1 = vsubq_u64(x1, y1);
          x1 = RotateLeft64<8>(x1);
      }
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = UnpackLow64(y1, x1);
      block1 = UnpackHigh64(y1, x1);
  }
  
  inline void SPECK128_Dec_6_Blocks(uint64x2_t &block0, uint64x2_t &block1,
      uint64x2_t &block2, uint64x2_t &block3, uint64x2_t &block4, uint64x2_t &block5,
      const word64 *subkeys, unsigned int rounds)
  {
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      uint64x2_t x1 = UnpackHigh64(block0, block1);
      uint64x2_t y1 = UnpackLow64(block0, block1);
      uint64x2_t x2 = UnpackHigh64(block2, block3);
      uint64x2_t y2 = UnpackLow64(block2, block3);
      uint64x2_t x3 = UnpackHigh64(block4, block5);
      uint64x2_t y3 = UnpackLow64(block4, block5);
  
      for (int i = static_cast<int>(rounds-1); i >= 0; --i)
      {
          const uint64x2_t rk = vld1q_dup_u64(subkeys+i);
  
          y1 = veorq_u64(y1, x1);
          y2 = veorq_u64(y2, x2);
          y3 = veorq_u64(y3, x3);
          y1 = RotateRight64<3>(y1);
          y2 = RotateRight64<3>(y2);
          y3 = RotateRight64<3>(y3);
          x1 = veorq_u64(x1, rk);
          x2 = veorq_u64(x2, rk);
          x3 = veorq_u64(x3, rk);
          x1 = vsubq_u64(x1, y1);
          x2 = vsubq_u64(x2, y2);
          x3 = vsubq_u64(x3, y3);
          x1 = RotateLeft64<8>(x1);
          x2 = RotateLeft64<8>(x2);
          x3 = RotateLeft64<8>(x3);
      }
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = UnpackLow64(y1, x1);
      block1 = UnpackHigh64(y1, x1);
      block2 = UnpackLow64(y2, x2);
      block3 = UnpackHigh64(y2, x2);
      block4 = UnpackLow64(y3, x3);
      block5 = UnpackHigh64(y3, x3);
  }
  
  #endif  // CRYPTOPP_ARM_NEON_AVAILABLE
  
  // ***************************** IA-32 ***************************** //
  
  #if defined(CRYPTOPP_SSSE3_AVAILABLE)
  
  // Clang __m128i casts, http://bugs.llvm.org/show_bug.cgi?id=20670
  #ifndef M128_CAST
  # define M128_CAST(x) ((__m128i *)(void *)(x))
  #endif
  #ifndef CONST_M128_CAST
  # define CONST_M128_CAST(x) ((const __m128i *)(const void *)(x))
  #endif
  
  // GCC double casts, https://www.spinics.net/lists/gcchelp/msg47735.html
  #ifndef DOUBLE_CAST
  # define DOUBLE_CAST(x) ((double *)(void *)(x))
  #endif
  #ifndef CONST_DOUBLE_CAST
  # define CONST_DOUBLE_CAST(x) ((const double *)(const void *)(x))
  #endif
  
  template <unsigned int R>
  inline __m128i RotateLeft64(const __m128i& val)
  {
  #if defined(CRYPTOPP_AVX512_ROTATE)
      return _mm_rol_epi64(val, R);
  #else
      return _mm_or_si128(
          _mm_slli_epi64(val, R), _mm_srli_epi64(val, 64-R));
  #endif
  }
  
  template <unsigned int R>
  inline __m128i RotateRight64(const __m128i& val)
  {
  #if defined(CRYPTOPP_AVX512_ROTATE)
      return _mm_ror_epi64(val, R);
  #else
      return _mm_or_si128(
          _mm_slli_epi64(val, 64-R), _mm_srli_epi64(val, R));
  #endif
  }
  
  // Faster than two Shifts and an Or. Thanks to Louis Wingers and Bryan Weeks.
  template <>
  inline __m128i RotateLeft64<8>(const __m128i& val)
  {
      const __m128i mask = _mm_set_epi8(14,13,12,11, 10,9,8,15, 6,5,4,3, 2,1,0,7);
      return _mm_shuffle_epi8(val, mask);
  }
  
  // Faster than two Shifts and an Or. Thanks to Louis Wingers and Bryan Weeks.
  template <>
  inline __m128i RotateRight64<8>(const __m128i& val)
  {
      const __m128i mask = _mm_set_epi8(8,15,14,13, 12,11,10,9, 0,7,6,5, 4,3,2,1);
      return _mm_shuffle_epi8(val, mask);
  }
  
  inline void SPECK128_Enc_Block(__m128i &block0, __m128i &block1,
      const word64 *subkeys, unsigned int rounds)
  {
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      __m128i x1 = _mm_unpackhi_epi64(block0, block1);
      __m128i y1 = _mm_unpacklo_epi64(block0, block1);
  
      for (int i=0; i < static_cast<int>(rounds); ++i)
      {
          const __m128i rk = _mm_castpd_si128(
              _mm_loaddup_pd(CONST_DOUBLE_CAST(subkeys+i)));
  
          x1 = RotateRight64<8>(x1);
          x1 = _mm_add_epi64(x1, y1);
          x1 = _mm_xor_si128(x1, rk);
          y1 = RotateLeft64<3>(y1);
          y1 = _mm_xor_si128(y1, x1);
      }
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = _mm_unpacklo_epi64(y1, x1);
      block1 = _mm_unpackhi_epi64(y1, x1);
  }
  
  inline void SPECK128_Enc_6_Blocks(__m128i &block0, __m128i &block1,
      __m128i &block2, __m128i &block3, __m128i &block4, __m128i &block5,
      const word64 *subkeys, unsigned int rounds)
  {
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      __m128i x1 = _mm_unpackhi_epi64(block0, block1);
      __m128i y1 = _mm_unpacklo_epi64(block0, block1);
      __m128i x2 = _mm_unpackhi_epi64(block2, block3);
      __m128i y2 = _mm_unpacklo_epi64(block2, block3);
      __m128i x3 = _mm_unpackhi_epi64(block4, block5);
      __m128i y3 = _mm_unpacklo_epi64(block4, block5);
  
      for (int i=0; i < static_cast<int>(rounds); ++i)
      {
          const __m128i rk = _mm_castpd_si128(
              _mm_loaddup_pd(CONST_DOUBLE_CAST(subkeys+i)));
  
          x1 = RotateRight64<8>(x1);
          x2 = RotateRight64<8>(x2);
          x3 = RotateRight64<8>(x3);
          x1 = _mm_add_epi64(x1, y1);
          x2 = _mm_add_epi64(x2, y2);
          x3 = _mm_add_epi64(x3, y3);
          x1 = _mm_xor_si128(x1, rk);
          x2 = _mm_xor_si128(x2, rk);
          x3 = _mm_xor_si128(x3, rk);
          y1 = RotateLeft64<3>(y1);
          y2 = RotateLeft64<3>(y2);
          y3 = RotateLeft64<3>(y3);
          y1 = _mm_xor_si128(y1, x1);
          y2 = _mm_xor_si128(y2, x2);
          y3 = _mm_xor_si128(y3, x3);
      }
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = _mm_unpacklo_epi64(y1, x1);
      block1 = _mm_unpackhi_epi64(y1, x1);
      block2 = _mm_unpacklo_epi64(y2, x2);
      block3 = _mm_unpackhi_epi64(y2, x2);
      block4 = _mm_unpacklo_epi64(y3, x3);
      block5 = _mm_unpackhi_epi64(y3, x3);
  }
  
  inline void SPECK128_Dec_Block(__m128i &block0, __m128i &block1,
      const word64 *subkeys, unsigned int rounds)
  {
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      __m128i x1 = _mm_unpackhi_epi64(block0, block1);
      __m128i y1 = _mm_unpacklo_epi64(block0, block1);
  
      for (int i = static_cast<int>(rounds-1); i >= 0; --i)
      {
          const __m128i rk = _mm_castpd_si128(
              _mm_loaddup_pd(CONST_DOUBLE_CAST(subkeys+i)));
  
          y1 = _mm_xor_si128(y1, x1);
          y1 = RotateRight64<3>(y1);
          x1 = _mm_xor_si128(x1, rk);
          x1 = _mm_sub_epi64(x1, y1);
          x1 = RotateLeft64<8>(x1);
      }
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = _mm_unpacklo_epi64(y1, x1);
      block1 = _mm_unpackhi_epi64(y1, x1);
  }
  
  inline void SPECK128_Dec_6_Blocks(__m128i &block0, __m128i &block1,
      __m128i &block2, __m128i &block3, __m128i &block4, __m128i &block5,
      const word64 *subkeys, unsigned int rounds)
  {
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      __m128i x1 = _mm_unpackhi_epi64(block0, block1);
      __m128i y1 = _mm_unpacklo_epi64(block0, block1);
      __m128i x2 = _mm_unpackhi_epi64(block2, block3);
      __m128i y2 = _mm_unpacklo_epi64(block2, block3);
      __m128i x3 = _mm_unpackhi_epi64(block4, block5);
      __m128i y3 = _mm_unpacklo_epi64(block4, block5);
  
      for (int i = static_cast<int>(rounds-1); i >= 0; --i)
      {
          const __m128i rk = _mm_castpd_si128(
              _mm_loaddup_pd(CONST_DOUBLE_CAST(subkeys+i)));
  
          y1 = _mm_xor_si128(y1, x1);
          y2 = _mm_xor_si128(y2, x2);
          y3 = _mm_xor_si128(y3, x3);
          y1 = RotateRight64<3>(y1);
          y2 = RotateRight64<3>(y2);
          y3 = RotateRight64<3>(y3);
          x1 = _mm_xor_si128(x1, rk);
          x2 = _mm_xor_si128(x2, rk);
          x3 = _mm_xor_si128(x3, rk);
          x1 = _mm_sub_epi64(x1, y1);
          x2 = _mm_sub_epi64(x2, y2);
          x3 = _mm_sub_epi64(x3, y3);
          x1 = RotateLeft64<8>(x1);
          x2 = RotateLeft64<8>(x2);
          x3 = RotateLeft64<8>(x3);
      }
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = _mm_unpacklo_epi64(y1, x1);
      block1 = _mm_unpackhi_epi64(y1, x1);
      block2 = _mm_unpacklo_epi64(y2, x2);
      block3 = _mm_unpackhi_epi64(y2, x2);
      block4 = _mm_unpacklo_epi64(y3, x3);
      block5 = _mm_unpackhi_epi64(y3, x3);
  }
  
  #endif  // CRYPTOPP_SSSE3_AVAILABLE
  
  // ***************************** Power8 ***************************** //
  
  #if defined(CRYPTOPP_POWER8_AVAILABLE)
  
  using CryptoPP::uint8x16_p;
  using CryptoPP::uint32x4_p;
  using CryptoPP::uint64x2_p;
  
  using CryptoPP::VectorAdd;
  using CryptoPP::VectorSub;
  using CryptoPP::VectorXor;
  
  // Rotate left by bit count
  template<unsigned int C>
  inline uint64x2_p RotateLeft64(const uint64x2_p val)
  {
      const uint64x2_p m = {C, C};
      return vec_rl(val, m);
  }
  
  // Rotate right by bit count
  template<unsigned int C>
  inline uint64x2_p RotateRight64(const uint64x2_p val)
  {
      const uint64x2_p m = {64-C, 64-C};
      return vec_rl(val, m);
  }
  
  void SPECK128_Enc_Block(uint32x4_p &block, const word64 *subkeys, unsigned int rounds)
  {
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8x16_p m1 = {31,30,29,28,27,26,25,24, 15,14,13,12,11,10,9,8};
      const uint8x16_p m2 = {23,22,21,20,19,18,17,16, 7,6,5,4,3,2,1,0};
  #else
      const uint8x16_p m1 = {7,6,5,4,3,2,1,0, 23,22,21,20,19,18,17,16};
      const uint8x16_p m2 = {15,14,13,12,11,10,9,8, 31,30,29,28,27,26,25,24};
  #endif
  
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      uint64x2_p x1 = (uint64x2_p)vec_perm(block, block, m1);
      uint64x2_p y1 = (uint64x2_p)vec_perm(block, block, m2);
  
      for (int i=0; i < static_cast<int>(rounds); ++i)
      {
          const uint64x2_p rk = vec_splats((unsigned long long)subkeys[i]);
  
          x1 = RotateRight64<8>(x1);
          x1 = VectorAdd(x1, y1);
          x1 = VectorXor(x1, rk);
  
          y1 = RotateLeft64<3>(y1);
          y1 = VectorXor(y1, x1);
      }
  
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8x16_p m3 = {31,30,29,28,27,26,25,24, 15,14,13,12,11,10,9,8};
      //const uint8x16_p m4 = {23,22,21,20,19,18,17,16, 7,6,5,4,3,2,1,0};
  #else
      const uint8x16_p m3 = {7,6,5,4,3,2,1,0, 23,22,21,20,19,18,17,16};
      //const uint8x16_p m4 = {15,14,13,12,11,10,9,8, 31,30,29,28,27,26,25,24};
  #endif
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block = (uint32x4_p)vec_perm(x1, y1, m3);
  }
  
  void SPECK128_Dec_Block(uint32x4_p &block, const word64 *subkeys, unsigned int rounds)
  {
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8x16_p m1 = {31,30,29,28,27,26,25,24, 15,14,13,12,11,10,9,8};
      const uint8x16_p m2 = {23,22,21,20,19,18,17,16, 7,6,5,4,3,2,1,0};
  #else
      const uint8x16_p m1 = {7,6,5,4,3,2,1,0, 23,22,21,20,19,18,17,16};
      const uint8x16_p m2 = {15,14,13,12,11,10,9,8, 31,30,29,28,27,26,25,24};
  #endif
  
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      uint64x2_p x1 = (uint64x2_p)vec_perm(block, block, m1);
      uint64x2_p y1 = (uint64x2_p)vec_perm(block, block, m2);
  
      for (int i = static_cast<int>(rounds-1); i >= 0; --i)
      {
          const uint64x2_p rk = vec_splats((unsigned long long)subkeys[i]);
  
          y1 = VectorXor(y1, x1);
          y1 = RotateRight64<3>(y1);
          x1 = VectorXor(x1, rk);
          x1 = VectorSub(x1, y1);
          x1 = RotateLeft64<8>(x1);
      }
  
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8x16_p m3 = {31,30,29,28,27,26,25,24, 15,14,13,12,11,10,9,8};
      //const uint8x16_p m4 = {23,22,21,20,19,18,17,16, 7,6,5,4,3,2,1,0};
  #else
      const uint8x16_p m3 = {7,6,5,4,3,2,1,0, 23,22,21,20,19,18,17,16};
      //const uint8x16_p m4 = {15,14,13,12,11,10,9,8, 31,30,29,28,27,26,25,24};
  #endif
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block = (uint32x4_p)vec_perm(x1, y1, m3);
  }
  
  void SPECK128_Enc_6_Blocks(uint32x4_p &block0, uint32x4_p &block1,
              uint32x4_p &block2, uint32x4_p &block3, uint32x4_p &block4,
              uint32x4_p &block5, const word64 *subkeys, unsigned int rounds)
  {
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8x16_p m1 = {31,30,29,28,27,26,25,24, 15,14,13,12,11,10,9,8};
      const uint8x16_p m2 = {23,22,21,20,19,18,17,16, 7,6,5,4,3,2,1,0};
  #else
      const uint8x16_p m1 = {7,6,5,4,3,2,1,0, 23,22,21,20,19,18,17,16};
      const uint8x16_p m2 = {15,14,13,12,11,10,9,8, 31,30,29,28,27,26,25,24};
  #endif
  
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      uint64x2_p x1 = (uint64x2_p)vec_perm(block0, block1, m1);
      uint64x2_p y1 = (uint64x2_p)vec_perm(block0, block1, m2);
      uint64x2_p x2 = (uint64x2_p)vec_perm(block2, block3, m1);
      uint64x2_p y2 = (uint64x2_p)vec_perm(block2, block3, m2);
      uint64x2_p x3 = (uint64x2_p)vec_perm(block4, block5, m1);
      uint64x2_p y3 = (uint64x2_p)vec_perm(block4, block5, m2);
  
      for (int i=0; i < static_cast<int>(rounds); ++i)
      {
          const uint64x2_p rk = vec_splats((unsigned long long)subkeys[i]);
  
          x1 = RotateRight64<8>(x1);
          x2 = RotateRight64<8>(x2);
          x3 = RotateRight64<8>(x3);
          x1 = VectorAdd(x1, y1);
          x2 = VectorAdd(x2, y2);
          x3 = VectorAdd(x3, y3);
          x1 = VectorXor(x1, rk);
          x2 = VectorXor(x2, rk);
          x3 = VectorXor(x3, rk);
  
          y1 = RotateLeft64<3>(y1);
          y2 = RotateLeft64<3>(y2);
          y3 = RotateLeft64<3>(y3);
          y1 = VectorXor(y1, x1);
          y2 = VectorXor(y2, x2);
          y3 = VectorXor(y3, x3);
      }
  
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8x16_p m3 = {31,30,29,28,27,26,25,24, 15,14,13,12,11,10,9,8};
      const uint8x16_p m4 = {23,22,21,20,19,18,17,16, 7,6,5,4,3,2,1,0};
  #else
      const uint8x16_p m3 = {7,6,5,4,3,2,1,0, 23,22,21,20,19,18,17,16};
      const uint8x16_p m4 = {15,14,13,12,11,10,9,8, 31,30,29,28,27,26,25,24};
  #endif
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = (uint32x4_p)vec_perm(x1, y1, m3);
      block1 = (uint32x4_p)vec_perm(x1, y1, m4);
      block2 = (uint32x4_p)vec_perm(x2, y2, m3);
      block3 = (uint32x4_p)vec_perm(x2, y2, m4);
      block4 = (uint32x4_p)vec_perm(x3, y3, m3);
      block5 = (uint32x4_p)vec_perm(x3, y3, m4);
  }
  
  void SPECK128_Dec_6_Blocks(uint32x4_p &block0, uint32x4_p &block1,
              uint32x4_p &block2, uint32x4_p &block3, uint32x4_p &block4,
              uint32x4_p &block5, const word64 *subkeys, unsigned int rounds)
  {
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8x16_p m1 = {31,30,29,28,27,26,25,24, 15,14,13,12,11,10,9,8};
      const uint8x16_p m2 = {23,22,21,20,19,18,17,16, 7,6,5,4,3,2,1,0};
  #else
      const uint8x16_p m1 = {7,6,5,4,3,2,1,0, 23,22,21,20,19,18,17,16};
      const uint8x16_p m2 = {15,14,13,12,11,10,9,8, 31,30,29,28,27,26,25,24};
  #endif
  
      // [A1 A2][B1 B2] ... => [A1 B1][A2 B2] ...
      uint64x2_p x1 = (uint64x2_p)vec_perm(block0, block1, m1);
      uint64x2_p y1 = (uint64x2_p)vec_perm(block0, block1, m2);
      uint64x2_p x2 = (uint64x2_p)vec_perm(block2, block3, m1);
      uint64x2_p y2 = (uint64x2_p)vec_perm(block2, block3, m2);
      uint64x2_p x3 = (uint64x2_p)vec_perm(block4, block5, m1);
      uint64x2_p y3 = (uint64x2_p)vec_perm(block4, block5, m2);
  
      for (int i = static_cast<int>(rounds-1); i >= 0; --i)
      {
          const uint64x2_p rk = vec_splats((unsigned long long)subkeys[i]);
  
          y1 = VectorXor(y1, x1);
          y2 = VectorXor(y2, x2);
          y3 = VectorXor(y3, x3);
          y1 = RotateRight64<3>(y1);
          y2 = RotateRight64<3>(y2);
          y3 = RotateRight64<3>(y3);
  
          x1 = VectorXor(x1, rk);
          x2 = VectorXor(x2, rk);
          x3 = VectorXor(x3, rk);
          x1 = VectorSub(x1, y1);
          x2 = VectorSub(x2, y2);
          x3 = VectorSub(x3, y3);
          x1 = RotateLeft64<8>(x1);
          x2 = RotateLeft64<8>(x2);
          x3 = RotateLeft64<8>(x3);
      }
  
  #if defined(CRYPTOPP_BIG_ENDIAN)
      const uint8x16_p m3 = {31,30,29,28,27,26,25,24, 15,14,13,12,11,10,9,8};
      const uint8x16_p m4 = {23,22,21,20,19,18,17,16, 7,6,5,4,3,2,1,0};
  #else
      const uint8x16_p m3 = {7,6,5,4,3,2,1,0, 23,22,21,20,19,18,17,16};
      const uint8x16_p m4 = {15,14,13,12,11,10,9,8, 31,30,29,28,27,26,25,24};
  #endif
  
      // [A1 B1][A2 B2] ... => [A1 A2][B1 B2] ...
      block0 = (uint32x4_p)vec_perm(x1, y1, m3);
      block1 = (uint32x4_p)vec_perm(x1, y1, m4);
      block2 = (uint32x4_p)vec_perm(x2, y2, m3);
      block3 = (uint32x4_p)vec_perm(x2, y2, m4);
      block4 = (uint32x4_p)vec_perm(x3, y3, m3);
      block5 = (uint32x4_p)vec_perm(x3, y3, m4);
  }
  
  #endif  // CRYPTOPP_POWER8_AVAILABLE
  
  ANONYMOUS_NAMESPACE_END
  
  ///////////////////////////////////////////////////////////////////////
  
  NAMESPACE_BEGIN(CryptoPP)
  
  // *************************** ARM NEON **************************** //
  
  #if (CRYPTOPP_ARM_NEON_AVAILABLE)
  size_t SPECK128_Enc_AdvancedProcessBlocks_NEON(const word64* subKeys, size_t rounds,
      const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags)
  {
      return AdvancedProcessBlocks128_6x2_NEON(SPECK128_Enc_Block, SPECK128_Enc_6_Blocks,
          subKeys, rounds, inBlocks, xorBlocks, outBlocks, length, flags);
  }
  
  size_t SPECK128_Dec_AdvancedProcessBlocks_NEON(const word64* subKeys, size_t rounds,
      const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags)
  {
      return AdvancedProcessBlocks128_6x2_NEON(SPECK128_Dec_Block, SPECK128_Dec_6_Blocks,
          subKeys, rounds, inBlocks, xorBlocks, outBlocks, length, flags);
  }
  #endif  // CRYPTOPP_ARM_NEON_AVAILABLE
  
  // ***************************** IA-32 ***************************** //
  
  #if defined(CRYPTOPP_SSSE3_AVAILABLE)
  size_t SPECK128_Enc_AdvancedProcessBlocks_SSSE3(const word64* subKeys, size_t rounds,
      const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags)
  {
      return AdvancedProcessBlocks128_6x2_SSE(SPECK128_Enc_Block, SPECK128_Enc_6_Blocks,
          subKeys, rounds, inBlocks, xorBlocks, outBlocks, length, flags);
  }
  
  size_t SPECK128_Dec_AdvancedProcessBlocks_SSSE3(const word64* subKeys, size_t rounds,
      const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags)
  {
      return AdvancedProcessBlocks128_6x2_SSE(SPECK128_Dec_Block, SPECK128_Dec_6_Blocks,
          subKeys, rounds, inBlocks, xorBlocks, outBlocks, length, flags);
  }
  #endif  // CRYPTOPP_SSSE3_AVAILABLE
  
  // ***************************** Power8 ***************************** //
  
  #if defined(CRYPTOPP_POWER8_AVAILABLE)
  size_t SPECK128_Enc_AdvancedProcessBlocks_POWER8(const word64* subKeys, size_t rounds,
      const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags)
  {
      return AdvancedProcessBlocks128_6x1_ALTIVEC(SPECK128_Enc_Block, SPECK128_Enc_6_Blocks,
          subKeys, rounds, inBlocks, xorBlocks, outBlocks, length, flags);
  }
  
  size_t SPECK128_Dec_AdvancedProcessBlocks_POWER8(const word64* subKeys, size_t rounds,
      const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags)
  {
      return AdvancedProcessBlocks128_6x1_ALTIVEC(SPECK128_Dec_Block, SPECK128_Dec_6_Blocks,
          subKeys, rounds, inBlocks, xorBlocks, outBlocks, length, flags);
  }
  #endif  // CRYPTOPP_POWER8_AVAILABLE
  
  NAMESPACE_END
  