[issue31671] IntFlag makes re.compile slower

[INADA Naoki]

New submission from INADA Naoki <songofacandy at gmail.com>:

flags exposed by re module are IntFlag from Python 3.4.

Since it is passed to underlying sre_parse and sre_compile,
tests in loop (e.g. `flags & SRE_FLAG_IGNORECASE`) calls
IntFlag.__and__ and creates new instance everytime.

It makes re.compile() slower.

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components: Library (Lib)
messages: 303594
nosy: inada.naoki
priority: normal
severity: normal
status: open
title: IntFlag makes re.compile slower
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31671>
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