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<title>delta/cryptopp-git.git/ppc-simd.cpp, branch master</title>
<subtitle>github.com: weidai11/cryptopp.git
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<entry>
<title>Rename files with dashes to underscores (GH #736)</title>
<updated>2018-11-10T13:00:14+00:00</updated>
<author>
<name>Jeffrey Walton</name>
<email>noloader@gmail.com</email>
</author>
<published>2018-11-10T13:00:14+00:00</published>
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Also see https://groups.google.com/forum/#!topic/cryptopp-users/HBz-6gZZFOA on the mailing list
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Also see https://groups.google.com/forum/#!topic/cryptopp-users/HBz-6gZZFOA on the mailing list
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</entry>
<entry>
<title>Rework Makefile and ppc-simd.h for XLC and LLVM front-end changes</title>
<updated>2018-08-05T09:39:42+00:00</updated>
<author>
<name>Jeffrey Walton</name>
<email>noloader@gmail.com</email>
</author>
<published>2018-08-05T09:39:42+00:00</published>
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</entry>
<entry>
<title>Update comments</title>
<updated>2018-08-03T20:16:08+00:00</updated>
<author>
<name>Jeffrey Walton</name>
<email>noloader@gmail.com</email>
</author>
<published>2018-08-03T20:16:08+00:00</published>
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</entry>
<entry>
<title>Rework PPC probes for XLC and LLVM</title>
<updated>2018-08-03T11:02:27+00:00</updated>
<author>
<name>Jeffrey Walton</name>
<email>noloader@gmail.com</email>
</author>
<published>2018-08-03T11:02:27+00:00</published>
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</entry>
<entry>
<title>Rework PPC probes for XLC and LLVM</title>
<updated>2018-08-03T06:54:50+00:00</updated>
<author>
<name>Jeffrey Walton</name>
<email>noloader@gmail.com</email>
</author>
<published>2018-08-03T06:54:50+00:00</published>
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</entry>
<entry>
<title>Improve CPU_ProbePower8() test</title>
<updated>2018-08-03T05:27:39+00:00</updated>
<author>
<name>Jeffrey Walton</name>
<email>noloader@gmail.com</email>
</author>
<published>2018-08-03T05:27:39+00:00</published>
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</entry>
<entry>
<title>Squash MS LNK4221 and libtool warnings</title>
<updated>2018-07-06T05:22:38+00:00</updated>
<author>
<name>Jeffrey Walton</name>
<email>noloader@gmail.com</email>
</author>
<published>2018-07-06T05:22:38+00:00</published>
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<entry>
<title>Remove extra ; from ppc-simd.cpp (PR #620)</title>
<updated>2018-03-31T17:06:44+00:00</updated>
<author>
<name>Ilja</name>
<email>ilja.honkonen@fmi.fi</email>
</author>
<published>2018-03-31T17:06:44+00:00</published>
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</entry>
<entry>
<title>Fix SHA feature detection on AIX</title>
<updated>2018-03-05T12:05:12+00:00</updated>
<author>
<name>Jeffrey Walton</name>
<email>noloader@gmail.com</email>
</author>
<published>2018-03-05T12:05:12+00:00</published>
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This one should have been fixed before the Crypto++ 6.1 release. Its no big deal, however. Power8 accelerated SHA-256 is 1.5x to 2x slower than straight C++. SHA-512 may be better, but the implementation is not ready to performance test.
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This one should have been fixed before the Crypto++ 6.1 release. Its no big deal, however. Power8 accelerated SHA-256 is 1.5x to 2x slower than straight C++. SHA-512 may be better, but the implementation is not ready to performance test.
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</entry>
<entry>
<title>Use x86 highest basic before calling a leaf function</title>
<updated>2018-01-11T22:59:24+00:00</updated>
<author>
<name>Jeffrey Walton</name>
<email>noloader@gmail.com</email>
</author>
<published>2018-01-11T22:59:24+00:00</published>
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This was a latent bug that just surfaced on a Sun Core2 workstation. RDSEED caused an illegal instruction exception on the Core2. It seems we managed to miss it because old processors had family and stepping values so low they never set CPUID.EBX.RDSEED[bit 18] = 1. Newer processors had the feature so CPUID.EBX.RDSEED[bit 18] = 1 was accurate.
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This was a latent bug that just surfaced on a Sun Core2 workstation. RDSEED caused an illegal instruction exception on the Core2. It seems we managed to miss it because old processors had family and stepping values so low they never set CPUID.EBX.RDSEED[bit 18] = 1. Newer processors had the feature so CPUID.EBX.RDSEED[bit 18] = 1 was accurate.
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