Serhiy Storchaka <storch...@gmail.com> added the comment:
"(unsigned short)(long >> 32)" returns the 16 bits (32..48) if short is 16-bit.
I agree that this variant is more strict and reliable (and this was my original
version) and if you do not find it verbose and redundant, so be it. The
difference will be noticeable only on a very exotic platform (with a 9-bit
chars, for example), where the original code also will not work. Frankly, in
this straightforward patch hacking is less than in the original code.
I made a mistake with the microbenchmark. In fact, acceleration is not 5%, but
20-40%.
./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x = (" " *
1000).encode("utf-16be")' 'd(x)'
./python -m timeit -s 'import codecs; d = codecs.utf_16_be_decode; x =
("\u263A" * 1000).encode("utf-16be")' 'd(x)'
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14249>
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