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gh-131798: JIT: replace _CHECK_METHOD_VERSION with _CHECK_FUNCTION_VERSION_INLINE #135022

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gh-131798: JIT: replace _CHECK_METHOD_VERSION with _CHECK_FUNCTION_VERSION_INLINE #135022

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gh-131798: JIT: replace _CHECK_METHOD_VERSION with _CHECK_FUNCTION_VE…
Zheaoli Jun 2, 2025
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Update news
Zheaoli Jun 2, 2025
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Merge branch 'main' of https://github.com/python/cpython into manjusa…
Zheaoli Jun 2, 2025
68f93b5
fix code style
Zheaoli Jun 2, 2025
cc8ecf1
fix code style
Zheaoli Jun 2, 2025
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Update Misc/NEWS.d/next/Core_and_Builtins/2025-06-02-20-13-37.gh-issu…
Zheaoli Jun 7, 2025
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fix review idea
Zheaoli Jun 7, 2025
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Merge main
Zheaoli Jun 8, 2025
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Zheaoli Jun 8, 2025
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Zheaoli Jun 15, 2025
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22 changes: 22 additions & 0 deletions Lib/test/test_capi/test_opt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1381,6 +1381,21 @@ def testfunc(n):
# Removed guard
self.assertNotIn("_CHECK_FUNCTION_EXACT_ARGS", uops)

def test_method_guards_removed_or_reduced(self):
def testfunc(n):
result = 0
for i in range(n):
result += test_bound_method(i)
return result
res, ex = self._run_with_optimizer(testfunc, TIER2_THRESHOLD)
self.assertEqual(res, sum(range(TIER2_THRESHOLD)))
self.assertIsNotNone(ex)
uops = get_opnames(ex)
self.assertIn("_PUSH_FRAME", uops)
# Strength reduced version
self.assertIn("_CHECK_FUNCTION_VERSION_INLINE", uops)
self.assertNotIn("_CHECK_METHOD_VERSION", uops)

def test_jit_error_pops(self):
"""
Tests that the correct number of pops are inserted into the
Expand Down Expand Up @@ -2279,5 +2294,12 @@ def f(n):
def global_identity(x):
return x

class TestObject:
def test(self, *args, **kwargs):
return args[0]

test_object = TestObject()
test_bound_method = TestObject.test.__get__(test_object)

Comment on lines +2297 to +2303
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Can you move this into test_method_guards_removed_or_reduced? global_identity needs to be at module scope for other reasons that don't apply here.

Also, I think it can be simplified to something like:

class TestObject:
    def test(self, arg):
        return arg

test_bound_method = TestObject().test

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If I'm correct, TestObject().test will just generate _CHECK_FUNCTION_VERSION code, It's a normal function.

Reference the test code here

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Can you move this into test_method_guards_removed_or_reduced? global_identity needs to be at module scope for other reasons that don't apply here.

BTW, if I push the test object into the test_method_guards_removed_or_reduced. I think the method will not be treated by a const. So we the _CHECK_FUNCTION_VERSION_INLINE is not exist in final opcode.

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@Zheaoli is right here. Can you please move this back to global scope? It seems tests are failing as the global method is not being promoted to a constant.

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Can you please move this back to global scope? It seems tests are failing as the global method is not being promoted to a constant.

Sure

if __name__ == "__main__":
unittest.main()
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-06-02-20-13-37.gh-issue-131798.JQRFvR.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Optimize ``_CHECK_METHOD_VERSION`` into ``_CHECK_FUNCTION_VERSION_INLINE`` in JIT-compiled code.
10 changes: 10 additions & 0 deletions Python/optimizer_bytecodes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -708,6 +708,16 @@ dummy_func(void) {
sym_set_type(callable, &PyFunction_Type);
}

op(_CHECK_METHOD_VERSION, (func_version/2, callable, null, unused[oparg] -- callable, null, unused[oparg])) {
if (sym_is_const(ctx, callable) && sym_matches_type(callable, &PyMethod_Type)) {
PyMethodObject *method = (PyMethodObject *)sym_get_const(ctx, callable);
assert(PyMethod_Check(method));
REPLACE_OP(this_instr, _CHECK_FUNCTION_VERSION_INLINE, 0, func_version);
this_instr->operand1 = (uintptr_t)method->im_func;
}
sym_set_type(callable, &PyMethod_Type);
}

op(_CHECK_FUNCTION_EXACT_ARGS, (callable, self_or_null, unused[oparg] -- callable, self_or_null, unused[oparg])) {
assert(sym_matches_type(callable, &PyFunction_Type));
if (sym_is_const(ctx, callable)) {
Expand Down
10 changes: 10 additions & 0 deletions Python/optimizer_cases.c.h
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