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This is the core of running a test. It is also the portion of run() that requires specialization for asyncio support.
This method is essentially ``_runTest`` with a Outcome object that does nothing. This commit inserts a new class that is a no-op Outcome so that the method can be re-used.
See discussion under https://bugs.python.org/issue32972
This makes AsyncioTestCase.doCleanups() safe to call at any time. The previous version terminated the event loop unnecessarily.
dave-shawley
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Mar 5, 2023
The existing volatile `left`/`right` pointers guarantee that the reads will all occur, but does not guarantee that they will be _used_. So a compiler can still short-circuit the loop, saving e.g. the overhead of doing the xors and especially the overhead of the data dependency between `result` and the reads. That would change performance depending on where the first unequal byte occurs. This change removes that optimization. (This is change GH-1 from https://bugs.python.org/issue40791 .) (cherry picked from commit 3172936) Co-authored-by: Devin Jeanpierre <jeanpierreda@google.com>
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