Lukas Lueg added the comment:

Here are some benchmarks for a arm7l on a rk30-board. CityHash was compiled 
with -mcpu=native -O3.

CityHash is around half as fast as the native algorithm for small strings and 
way, way slower on larger ones. My guess would be that the complex arithmetic 
in cityhash outweights the gains of better scheduling.

The results are somewhat inconclusive, as the performance increases again for 
very long strings.

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Added file: http://bugs.python.org/file30447/cityhash_arm.txt

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