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GH-117066: Tier 2 optimizer: Don't throw away good traces if we can't optimize them perfectly. #117067

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Merged
merged 3 commits into from
Mar 20, 2024
Merged

GH-117066: Tier 2 optimizer: Don't throw away good traces if we can't optimize them perfectly. #117067

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711d7e7
Tier 2 optimizer: Don't throw away good traces if we can't optimize t…
markshannon Mar 19, 2024
db050c0
Revert behavior on finding a type contradiction, and improve comment
markshannon Mar 20, 2024
6710f70
Don't forget to clean up
markshannon Mar 20, 2024
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16 changes: 10 additions & 6 deletions Python/optimizer_analysis.c
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Original file line number Diff line number Diff line change
Expand Up @@ -406,24 +406,28 @@ optimize_uops(
out_of_space:
DPRINTF(3, "\n");
DPRINTF(1, "Out of space in abstract interpreter\n");
_Py_uop_abstractcontext_fini(ctx);
return 0;

goto done;
error:
DPRINTF(3, "\n");
DPRINTF(1, "Encountered error in abstract interpreter\n");
_Py_uop_abstractcontext_fini(ctx);
return 0;
return -1;

hit_bottom:
// Attempted to push a "bottom" (contradition) symbol onto the stack.
// This means that the abstract interpreter has hit unreachable code.
// We *could* generate an _EXIT_TRACE or _FATAL_ERROR here, but it's
// simpler to just admit failure and not create the executor.
// We *could* generate an _EXIT_TRACE or _FATAL_ERROR here, but hitting
// bottom indicates type instability, so we are probably better off
// retrying later.
DPRINTF(3, "\n");
DPRINTF(1, "Hit bottom in abstract interpreter\n");
_Py_uop_abstractcontext_fini(ctx);
return 0;
done:
/* Cannot optimize further, but there would be no benefit
* in retrying later */
_Py_uop_abstractcontext_fini(ctx);
return 1;
}


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4 changes: 3 additions & 1 deletion Python/optimizer_bytecodes.c
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Expand Up @@ -546,7 +546,9 @@ dummy_func(void) {
PyFunctionObject *func = (PyFunctionObject *)(this_instr + 2)->operand;
DPRINTF(3, "func: %p ", func);
if (func == NULL) {
goto error;
DPRINTF(3, "\n");
DPRINTF(1, "Missing function\n");
goto done;
}
PyCodeObject *co = (PyCodeObject *)func->func_code;

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4 changes: 3 additions & 1 deletion Python/optimizer_cases.c.h
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