Victor Stinner c6b292cdee bpo-29882: Add _Py_popcount32() function (GH-20518) ...

* Rename pycore_byteswap.h to pycore_bitutils.h.
* Move popcount_digit() to pycore_bitutils.h as _Py_popcount32().
* _Py_popcount32() uses GCC and clang builtin function if available.
* Add unit tests to _Py_popcount32().

2020-06-08 16:30:33 +02:00

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