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* Replaces ad-hoc logic for ending traces with a simple inequality: `fitness < exit_quality` * Fitness starts high and is reduced for branches, backward edges, calls and trace length * Exit quality reflect how good a spot that instruction is to end a trace. Closing a loop is very, specializable instructions are very low and the others in between.
Tests in this directory are compiled into the _testinternalcapi extension. The main file for the extension is Modules/_testinternalcapimodule.c, which calls `_PyTestInternalCapi_Init_*` from these functions. See Modules/_testcapi/README.txt for guideline when writing C test code.