STINNER Victor added the comment:
I still see a difference between find and rfind, even if the different is low
(11%).
$ ./python -m timeit -s 's="ABC"*33; a=((s+"D")*500+s+"E"); b=s+"E"' 'a.find(b)'
10000 loops, best of 3: 93.6 usec per loop
$ ./python -m timeit -s 's="ABC"*33; a=("E"+s+("D"+s)*500); b="E"+s'
'a.rfind(b)'
10000 loops, best of 3: 84.3 usec per loop
Patched Python:
$ ./python -m timeit -s 's="ABC"*33; a=((s+"D")*500+s+"E"); b=s+"E"' 'a.find(b)'
10000 loops, best of 3: 84.7 usec per loop
$ ./python -m timeit -s 's="ABC"*33; a=("E"+s+("D"+s)*500); b="E"+s'
'a.rfind(b)'
10000 loops, best of 3: 84.5 usec per loop
I'm unable to explain why GCC (4.7 in my case) produces faster code with the
patch, but the patch is simple and does not make the code (much) harder to
understand.
So Antoine, please go ahead and apply it.
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versions: +Python 3.4 -Python 3.3
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