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gh-104584: Baby steps towards generating and executing traces (#105924)

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Added a new, experimental, tracing optimizer and interpreter (a.k.a. "tier 2"). This currently pessimizes, so don't use yet -- this is infrastructure so we can experiment with optimizing passes. To enable it, pass ``-Xuops`` or set ``PYTHONUOPS=1``. To get debug output, set ``PYTHONUOPSDEBUG=N`` where ``N`` is a debug level (0-4, where 0 is no debug output and 4 is excessively verbose).

All of this code is likely to change dramatically before the 3.13 feature freeze. But this is a first step.
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Guido van Rossum 2023-06-26 19:02:57 -07:00 • committed by GitHub
parent d3af83b934
commit 51fc725117
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21 changed files with 2559 additions and 305 deletions
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13
Python/pylifecycle.c
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@ -1181,6 +1181,19 @@ init_interp_main(PyThreadState *tstate)
#endif
}
// Turn on experimental tier 2 (uops-based) optimizer
if (is_main_interp) {
char *envvar = Py_GETENV("PYTHONUOPS");
int enabled = envvar != NULL && *envvar > '0';
if (_Py_get_xoption(&config->xoptions, L"uops") != NULL) {
enabled = 1;
}
if (enabled) {
PyObject *opt = PyUnstable_Optimizer_NewUOpOptimizer();
PyUnstable_SetOptimizer((_PyOptimizerObject *)opt);
}
}
assert(!_PyErr_Occurred(tstate));
return _PyStatus_OK();