[issue14249] unicodeobject.c: aliasing warnings
report at bugs.python.org
Thu Apr 5 23:24:26 CEST 2012
Serhiy Storchaka <storchaka at gmail.com> added the comment:
> I just replaced expressions in calls to Py_MAX by variables: Py_MAX is a macro and it may have to compute each expression twice.
gcc computes those values only once. It even caches them for use in
PyUnicode_WRITE. But other compilers may not be so smart.
Instead of Py_MAX(a,b) here you can use a|b. In theory this should be
more efficient, but I couldn't see the difference even with microscope.
However, all this does not matter, soon I will submit complex patch,
which speeds up the utf-16 decoder in 2-5 times.
Python tracker <report at bugs.python.org>
More information about the Python-bugs-list