Use PowerPC unaligned loads and stores with Power8 (GH #825, PR #826)

Use PowerPC unaligned loads and stores with Power8. Formerly we were using Power7 as the floor because the IBM POWER Architecture manuals said unaligned loads and stores were available. However, some compilers generate bad code for unaligned loads and stores using `-march=power7`, so bump to a known good.

1 files changed, 5 insertions, 5 deletions

diff --git a/chacha_simd.cpp b/chacha_simd.cpp
index 65316384..9fd6b0f1 100644
--- a/chacha_simd.cpp
+++ b/chacha_simd.cpp
@@ -209,7 +209,7 @@ inline __m128i RotateLeft<16>(const __m128i val)
 

 #if (CRYPTOPP_ALTIVEC_AVAILABLE)

 

-// ChaCha_OperateKeystream_POWER7 is optimized for POWER7. However, Altivec

+// ChaCha_OperateKeystream_POWER8 is optimized for POWER7. However, Altivec

 // is supported by using vec_ld and vec_st, and using a composite VecAdd

 // that supports 64-bit element adds. vec_ld and vec_st add significant

 // overhead when memory is not aligned. Despite the drawbacks Altivec

@@ -827,7 +827,7 @@ void ChaCha_OperateKeystream_SSE2(const word32 *state, const byte* input, byte *
 

 #endif  // CRYPTOPP_SSE2_INTRIN_AVAILABLE

 

-#if (CRYPTOPP_POWER7_AVAILABLE || CRYPTOPP_ALTIVEC_AVAILABLE)

+#if (CRYPTOPP_POWER8_AVAILABLE || CRYPTOPP_ALTIVEC_AVAILABLE)

 

 // ChaCha_OperateKeystream_CORE will use either POWER7 or ALTIVEC,

 // depending on the flags used to compile this source file. The

@@ -1096,11 +1096,11 @@ inline void ChaCha_OperateKeystream_CORE(const word32 *state, const byte* input,
     VecStore32LE(output + 15*16, r3_3);

 }

 

-#endif  // CRYPTOPP_POWER7_AVAILABLE || CRYPTOPP_ALTIVEC_AVAILABLE

+#endif  // CRYPTOPP_POWER8_AVAILABLE || CRYPTOPP_ALTIVEC_AVAILABLE

 

-#if (CRYPTOPP_POWER7_AVAILABLE)

+#if (CRYPTOPP_POWER8_AVAILABLE)

 

-void ChaCha_OperateKeystream_POWER7(const word32 *state, const byte* input, byte *output, unsigned int rounds)

+void ChaCha_OperateKeystream_POWER8(const word32 *state, const byte* input, byte *output, unsigned int rounds)

 {

     ChaCha_OperateKeystream_CORE(state, input, output, rounds);

 }