[issue45116] Performance regression 3.10b1 and later on Windows: Py_DECREF() not inlined in PGO build

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I added Py_ALWAYS_INLINE to run benchmarks more easily. Even if Py_INCREF() is converted back to a macro, there are now multiple static inline functions which are short and performance critical.

Using Py_ALWAYS_INLINE *may* speed up the Python debug builds and the PGO build on Windows if I understood correctly.

Right now, I'm not sure. The heuristic to decide if a function is inlined or not seems to depend a lot on the compiler and the compiler options.

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<https://bugs.python.org/issue45116>
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