[issue29461] Experiment usage of likely/unlikely in CPython core

[Raymond Hettinger]

Raymond Hettinger added the comment:

I had read that likely/unlikely were hard to use well and often not worth the trouble.   IIRC, they are used extensively in the Linux kernel but people were finding zero measurable effect when enabling or disabling the constructs.

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nosy: +rhettinger

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<http://bugs.python.org/issue29461>
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