GH-104584: Fix incorrect uoperands#107513
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brandtbucher added type-bug 
gvanrossum approved these changes Jul 31, 2023
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Good catch! I'm surprised this never showed when I tested things. I guess it just caused excessive cache failures. :-(
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There's currently an off-by-one error during trace construction that causes incorrect values to be loaded from the inline caches.
This fix results in a significant reduction in deoptimization events, and a dramatic improvement in our ability to stay on trace!