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gh-130704: Strength reduce LOAD_FAST{_LOAD_FAST} (#130708)

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Optimize `LOAD_FAST` opcodes into faster versions that load borrowed references onto the operand stack when we can prove that the lifetime of the local outlives the lifetime of the temporary that is loaded onto the stack.
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mpage 2025-04-01 10:18:42 -07:00 • committed by GitHub
parent e9556e1004
commit 053c285f6b
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35 changed files with 1282 additions and 345 deletions
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8
Python/gc.c
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@ -544,6 +544,12 @@ visit_decref(PyObject *op, void *parent)
int
_PyGC_VisitStackRef(_PyStackRef *ref, visitproc visit, void *arg)
{
// This is a bit tricky! We want to ignore stackrefs with embedded
// refcounts when computing the incoming references, but otherwise treat
// them like normal.
if (!PyStackRef_RefcountOnObject(*ref) && (visit == visit_decref)) {
return 0;
}
Py_VISIT(PyStackRef_AsPyObjectBorrow(*ref));
return 0;
}
@ -554,7 +560,7 @@ _PyGC_VisitFrameStack(_PyInterpreterFrame *frame, visitproc visit, void *arg)
_PyStackRef *ref = _PyFrame_GetLocalsArray(frame);
/* locals and stack */
for (; ref < frame->stackpointer; ref++) {
Py_VISIT(PyStackRef_AsPyObjectBorrow(*ref));
_Py_VISIT_STACKREF(*ref);
}
return 0;
}