STINNER Victor added the comment:
In issue #18719, Raymond modified Python 2.7, but he didn't touch the following
macro:
#define Py_UNICODE_MATCH(string, offset, substring) \
((*((string)->str + (offset)) == *((substring)->str)) && \
((*((string)->str + (offset) + (substring)->length-1) == *((substring)->str
+ (substring)->length-1))) && \
!memcmp((string)->str + (offset), (substring)->str,
(substring)->length*sizeof(Py_UNICODE)))
It was said that looking for the last character before calling memcmp() is
inefficient for the CPU cache. This macro should also be modified.
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<http://bugs.python.org/issue17628>
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