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gh-131798: JIT: replace _CHECK_METHOD_VERSION with _CHECK_FUNCTION_VERSION_INLINE by Zheaoli · Pull Request #135022 · python/cpython · GitHub

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

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Merged
Fidget-Spinner merged 10 commits into from
Jun 16, 2025
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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
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fix code style
Zheaoli Jun 2, 2025
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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

brandtbucher Jun 6, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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

Zheaoli Jun 7, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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

Reference the test code here

Zheaoli Jun 7, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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.

Fidget-Spinner Jun 15, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

@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.

Zheaoli Jun 15, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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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