Serhiy Storchaka added the comment:
The result does not depend on the direction of comparison. This only affects
speed. But who can to say in which direction comparison will be faster?
Here I see a one obvious opportunity for optimization:
if (kind_self < kind_sub)
return 0;
After that and after processing the case (kind_self == kind_sub) only 3 special
cases left: UCS1 in UCS2, UCS1 in UCS4, and UCS2 in UCS4. Get rid of slow
PyUnicode_READ() for this cases will speed up the code. Also note that
comparing first and last characters before memcmp can be a slowdown (because
PyUnicode_READ() is slow). Try to compare first and last bytes.
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<http://bugs.python.org/issue16281>
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