[issue24915] Profile Guided Optimization improvements (better training, llvm support, etc)

[Alecsandru Patrascu]

Alecsandru Patrascu added the comment:

Thank you for upstreaming this in both branches of Python!
Do you think that a different version of regrtest.py, that will be used only for PGO training, should be better in this case? I mean, by implementing a custom version, I think we can control better the output and errors shown on screen.

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<http://bugs.python.org/issue24915>
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