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Add PowerPC Power8 SHA hashing (GH #513)
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Perforance increases significantly, but there's still room for improvement. Even OpenSSL's numbers are relatively dull. We expect Power8's SHA-256 to be somewhere between 2 to 8 cpb but we are not hitting them.

SHA-256, GCC112 (ppc64-le): C++ 23.43, Power8 13.24 cpb (+ 110 MiB/s)
SHA-256, GCC119 (ppc64-be): C++ 10.16, Power8  9.74 cpb (+ 50 MiB/s)

SHA-512, GCC112 (ppc64-le): C++ 14.00, Power8 9.25 cpb (+ 150 MiB/s)
SHA-512, GCC119 (ppc64-be): C++ 21.05, Power8 6.17 cpb (+ 450 MiB/s)
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@noloader
noloader committed Mar 10, 2018
1 parent 95804ce commit 0630d46
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2 changes: 1 addition & 1 deletion config.h
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Original file line number Diff line number Diff line change
Expand Up @@ -685,7 +685,7 @@ NAMESPACE_END
#if !defined(CRYPTOPP_POWER8_AES_AVAILABLE) && !defined(CRYPTOPP_DISABLE_POWER8_AES) && defined(CRYPTOPP_POWER8_AVAILABLE)
# if defined(__CRYPTO__) || defined(_ARCH_PWR8) || (CRYPTOPP_XLC_VERSION >= 130000) || (CRYPTOPP_GCC_VERSION >= 40800)
# define CRYPTOPP_POWER8_AES_AVAILABLE 1
//# define CRYPTOPP_POWER8_SHA_AVAILABLE 1
# define CRYPTOPP_POWER8_SHA_AVAILABLE 1
//# define CRYPTOPP_POWER8_CRC_AVAILABLE 1
# endif
#endif
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Also see Issue 513.

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