[issue31671] IntFlag makes re.compile slower

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

> IntFlag.__and__ does not create a new instance every time -- all new instances are cached in the IntFlag machinery (so RegexFlag(7) is only created once).

I'm sorry, I misunderstood.
But while new instance is not created each time, 4 Python method calls
(e,g.  IntFlag.__and__() -> IntFlag.__new__() -> IntFlag._missing_() -> IntFlag._create_pseudo_member_()) are much slower than int & int.

> If all the RegexFlag combinations are created before the regex compile benchmark do we still see a speed-up?

I believe that's what Victor benchmarked.

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