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OPENSSL_ia32cap.pod update.

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This commit is contained in:
Andy Polyakov 2009-11-15 17:34:24 +00:00
parent a83f83aac8
commit cca3ea1e71
1 changed files with 4 additions and 2 deletions
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doc/crypto/OPENSSL_ia32cap.pod
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@ -21,14 +21,16 @@ manipulated afterwards to modify crypto library behaviour. For the
moment of this writing seven bits are significant, namely:
1. bit #4 denoting presence of Time-Stamp Counter.
2. bit #20, reserved by Intel, is used to choose between RC4 code
2. bit #20, reserved by Intel, is used to choose among RC4 code
paths;
3. bit #23 denoting MMX support;
4. bit #25 denoting SSE support;
5. bit #26 denoting SSE2 support;
6. bit #28 denoting Hyperthreading, which is used to distiguish
cores with shared cache;
7. bit #57 denoting Intel AES instruction set extension;
7. bit #30, reserved by Intel, is used to choose among RC4 code
paths;
8. bit #57 denoting Intel AES instruction set extension;
For example, clearing bit #26 at run-time disables high-performance
SSE2 code present in the crypto library. You might have to do this if