[issue17628] str==str: compare the first character before calling memcmp()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Perhaps it worth manually inline unicode_eq() in these tight inner loops. Then we can move "PyUnicode_GET_LENGTH(a) * PyUnicode_KIND(a)" out of the loop.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17628>
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