From 758e31d5a01967469116310e5a59b4ce58429380 Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Sat, 24 Nov 2018 03:27:12 -0500
Subject: [PATCH] Add 64-bit element rotates for POWER7

---
 ppc_simd.h | 43 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/ppc_simd.h b/ppc_simd.h
index f52540c8..631e19e7 100644
--- a/ppc_simd.h
+++ b/ppc_simd.h
@@ -25,7 +25,7 @@
 // DO NOT USE this pattern in VecLoad and VecStore. We have to use the
 // spaghetti code tangled in preprocessor macros because XLC 12 generates
 // bad code in some places. To verify the bad code generation test on
-// GCC111 with XLC 12.01 installed. XLC 13 on GCC112 and GCC119 is OK.
+// GCC111 with XLC 12.01 installed. XLC 13 on GCC112 and GCC119 are OK.
 //
 //   inline uint32x4_p VecLoad(const byte src[16])
 //   {
@@ -338,7 +338,6 @@ inline uint64x2_p VecLoad(int off, const word64 src[2])
 
 #endif  // _ARCH_PWR7
 
-
 /// \brief Loads a vector from an aligned byte array
 /// \param src the byte array
 /// \details VecLoadAligned loads a vector in from an aligned byte array.
@@ -1144,6 +1143,26 @@ inline uint32x4_p VecRotateLeft(const uint32x4_p vec)
     return vec_rl(vec, m);
 }
 
+#if defined(_ARCH_PWR7) || defined(CRYPTOPP_DOXYGEN_PROCESSING)
+
+/// \brief Rotate a vector left
+/// \tparam C shift bit count
+/// \param vec the vector
+/// \returns vector
+/// \details VecRotateLeft rotates each element in a packed vector by bit count.
+/// \details VecRotateLeft with 64-bit elements is available on POWER7 and above.
+/// \par Wraps
+///   vec_rl
+/// \since Crypto++ 8.0
+template<unsigned int C>
+inline uint64x2_p VecRotateLeft(const uint64x2_p vec)
+{
+    const uint64x2_p m = {C, C};
+    return vec_rl(vec, m);
+}
+
+#endif
+
 /// \brief Rotate a vector right
 /// \tparam C shift bit count
 /// \param vec the vector
@@ -1159,6 +1178,26 @@ inline uint32x4_p VecRotateRight(const uint32x4_p vec)
     return vec_rl(vec, m);
 }
 
+#if defined(_ARCH_PWR7) || defined(CRYPTOPP_DOXYGEN_PROCESSING)
+
+/// \brief Rotate a vector right
+/// \tparam C shift bit count
+/// \param vec the vector
+/// \returns vector
+/// \details VecRotateRight rotates each element in a packed vector by bit count.
+/// \details VecRotateRight with 64-bit elements is available on POWER7 and above.
+/// \par Wraps
+///   vec_rl
+/// \since Crypto++ 8.0
+template<unsigned int C>
+inline uint64x2_p VecRotateRight(const uint64x2_p vec)
+{
+    const uint64x2_p m = {64-C, 64-C};
+    return vec_rl(vec, m);
+}
+
+#endif
+
 /// \brief Exchange high and low double words
 /// \tparam T vector type
 /// \param vec the vector