Add VecReverseBE for big-endian systems

1 files changed, 21 insertions, 1 deletions

diff --git a/ppc_simd.h b/ppc_simd.h
index 6fe1fe8c..9011724d 100644
--- a/ppc_simd.h
+++ b/ppc_simd.h
@@ -233,7 +233,7 @@ inline uint32x4_p VecOne()
 /// \details VecReverseLE() reverses the bytes in a vector on

 ///  little-endian systems.

 /// \par Wraps

-///  vec_perm on POWER8 and below

+///  vec_perm

 /// \since Crypto++ 6.0

 template <class T>

 inline T VecReverseLE(const T data)

@@ -246,6 +246,26 @@ inline T VecReverseLE(const T data)
 #endif

 }

 

+/// \brief Reverse bytes in a vector

+/// \tparam T vector type

+/// \param data the vector

+/// \returns vector

+/// \details VecReverseLE() reverses the bytes in a vector on

+///  big-endian systems.

+/// \par Wraps

+///  vec_perm

+/// \since Crypto++ 6.0

+template <class T>

+inline T VecReverseBE(const T data)

+{

+#if defined(CRYPTOPP_BIG_ENDIAN)

+    const uint8x16_p mask = {15,14,13,12, 11,10,9,8, 7,6,5,4, 3,2,1,0};

+    return (T)vec_perm(data, data, mask);

+#else

+    return data;

+#endif

+}

+

 /// \name LOAD OPERATIONS

 //@{