STINNER Victor <[email protected]> added the comment:
Result of the benchmark before/after my commit. I prefer an unit over manually
manipulate long as short or bytes, because I think that the compiler knows
better how to optimize operations on integers.
unpatched:
$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " *
1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 4.64 usec per loop
$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x =
("\u263A" * 1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 5.87 usec per loop
patched:
$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " *
1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 3.53 usec per loop
$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x =
("\u263A" * 1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 4.85 usec per loop
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Python tracker <[email protected]>
<http://bugs.python.org/issue14249>
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