Mark Dickinson <dicki...@gmail.com> added the comment:

> Apart from the misindentation 

Apologies.  My fault for editing Python files while at work, with a
substandard editor configuration...

> have you run the benchmark script with it?

I have now.  See attached file for 3 sets of results (original, xor
version, and rotate) on 64-bit Linux/Core 2 Duo.

Summary: rotate is uniformly and significantly faster than xor;  xor is
uniformly and significantly faster than the unpatched version.

Added file: http://bugs.python.org/file13068/linux_x86_64_timings.txt

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