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前往新版Gitcode,体验更适合开发者的 AI 搜索 >>
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544d8455
编写于
10月 23, 2006
作者:
A
Andy Polyakov
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电子邮件补丁
差异文件
OPENSSL_ia32cap.pod update.
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doc/crypto/OPENSSL_ia32cap.pod
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doc/crypto/OPENSSL_ia32cap.pod
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@@ -17,18 +17,19 @@ register after executing CPUID instruction with EAX=1 input value (see
Intel Application Note #241618). Naturally it's meaningful on IA-32[E]
platforms only. The variable is normally set up automatically upon
toolkit initialization, but can be manipulated afterwards to modify
crypto library behaviour. For the moment of this writing
thre
e bits are
crypto library behaviour. For the moment of this writing
fiv
e bits are
significant, namely bit #28 denoting Hyperthreading, which is used to
distinguish Intel P4 core, bit #26 denoting SSE2 support, and bit #4
denoting presence of Time-Stamp Counter. Clearing bit #26 at run-time
for example disables high-performance SSE2 code present in the crypto
distinguish Intel P4 core, bit #26 denoting SSE2 support, bit #25
denoting SSE support, bit #23 denoting MMX support, and bit #4 denoting
presence of Time-Stamp Counter. Clearing bit #26 at run-time for
example disables high-performance SSE2 code present in the crypto
library. You might have to do this if target OpenSSL application is
executed on SSE2 capable CPU, but under control of OS which does not
support SSE2 extentions. Even though you can manipulate the value
programmatically, you most likely will find it more appropriate to set
up an environment variable with the same name prior starting target
application, e.g. 'env OPENSSL_ia32cap=0x1
0 apps/openssl', to achieve
same effect without modifying the application source code.
application, e.g. 'env OPENSSL_ia32cap=0x1
2800010 apps/openssl', to
achieve
same effect without modifying the application source code.
Alternatively you can reconfigure the toolkit with no-sse2 option and
recompile.
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