[issue19251] bitwise ops for bytes of equal length

[Марк Коренберг]

Марк Коренберг added the comment:

in order to increase perofrmance even more, use block operation on bytes. I.e. Xor by 8 bytes first (on 64-bit system) while size remainig is bigger or equal to 8, then by 4 bytes using same loop, and then xor remaining bytes by one byte. This will increase performance roughly to 8 times on 64bit systems and by 4 times on 32bit systems.

See my PR https://github.com/KeepSafe/aiohttp/pull/687/files for details

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<http://bugs.python.org/issue19251>
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