Stefan Krah <[email protected]> added the comment:
On 64-bit Linux with gcc-4.4 I get:
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: 4.1 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
2c514c382a2a:
$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " *
1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 3.68 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: 4.72 usec per loop
utf16_decoder_shift_3.patch:
$ ./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " *
1000).encode("utf-16be")' 'd(x)'
100000 loops, best of 3: 2.23 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: 3.11 usec per loop
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<http://bugs.python.org/issue14249>
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