From 5ce8a3e7f6e0b47ffa975c4ef5a3e7d4844cd47b Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Mon, 11 May 2020 22:43:07 -0400
Subject: Add VecReverseBE for big-endian systems

---
 ppc_simd.h | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

(limited to 'ppc_simd.h')

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
 //@{
 
-- 
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