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gh-GH-131798: optimize jit attribute loads on immutable types by kumaraditya303 · Pull Request #146449 · python/cpython · GitHub

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gh-GH-131798: optimize jit attribute loads on immutable types #146449

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Merged
kumaraditya303 merged 5 commits into from
Mar 26, 2026
Conversation 2 Commits 5 Checks 67 Files changed
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gh-GH-131798: optimize jit attribute loads on immutable types #146449

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4b401a7
optimize jit attribute loads on immutable types
kumaraditya303 Mar 26, 2026
ad15c8d
Merge branch 'main' of https://github.com/python/cpython into jit
kumaraditya303 Mar 26, 2026
65cae76
add comment
kumaraditya303 Mar 26, 2026
8f860c9
improve test
kumaraditya303 Mar 26, 2026
92658e4
fix test_call_list_append
kumaraditya303 Mar 26, 2026
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5 changes: 2 additions & 3 deletions Lib/test/test_capi/test_opt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2792,9 +2792,6 @@ def testfunc(n):
self.assertEqual(res, sum(range(TIER2_THRESHOLD)))
uops = get_opnames(ex)
self.assertIn("_CALL_LIST_APPEND", uops)
# We should remove these in the future
self.assertIn("_GUARD_NOS_LIST", uops)
self.assertIn("_GUARD_CALLABLE_LIST_APPEND", uops)

def test_call_list_append_pop_top(self):
def testfunc(n):
Expand Down Expand Up @@ -3030,6 +3027,8 @@ def f(n):
self.assertEqual(res, TIER2_THRESHOLD)
uops = get_opnames(ex)
self.assertNotIn("_LOAD_ATTR_METHOD_NO_DICT", uops)
self.assertNotIn("_LOAD_CONST_UNDER_INLINE", uops)
self.assertIn("_LOAD_CONST_UNDER_INLINE_BORROW", uops)

def test_store_fast_refcount_elimination(self):
def foo(x):
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6 changes: 5 additions & 1 deletion Python/optimizer_analysis.c
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Expand Up @@ -367,7 +367,11 @@ lookup_attr(JitOptContext *ctx, _PyBloomFilter *dependencies, _PyUOpInstruction
if (type && PyType_Check(type)) {
PyObject *lookup = _PyType_Lookup(type, name);
if (lookup) {
int opcode = _Py_IsImmortal(lookup) ? immortal : mortal;
int opcode = mortal;
// if the object is immortal or the type is immutable, borrowing is safe
if (_Py_IsImmortal(lookup) || (type->tp_flags & Py_TPFLAGS_IMMUTABLETYPE)) {
opcode = immortal;
}
ADD_OP(opcode, 0, (uintptr_t)lookup);
PyType_Watch(TYPE_WATCHER_ID, (PyObject *)type);
_Py_BloomFilter_Add(dependencies, type);
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