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Showing content from http://mail.python.org/pipermail/python-dev/2002-August/028463.html below:

[Python-Dev] tiny optimization in ceval mainloop

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[Jack]
> And I don't think we can be sure that even clearing is guaranteed to
> work (if another thread is halfway a load-decrement-store sequence
> the clear could be lost).

I think that pretty much kills the idea.  has anybody checked whether
it causes a measurable speedup?  If not, I propose not to bother.

--Guido van Rossum (home page: http://www.python.org/~guido/)

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