python · Fidget-Spinner · May 2, 2026 · Apr 11, 2026 · Apr 11, 2026 · Apr 14, 2026
diff --git a/Include/internal/pycore_opcode_metadata.h b/Include/internal/pycore_opcode_metadata.h
@@ -2984,14 +2984,15 @@ dummy_func(

        macro(LOAD_ATTR_CLASS) =
            unused/1 +
+            _RECORD_TOS +
            _CHECK_ATTR_CLASS +
            unused/2 +
            _LOAD_ATTR_CLASS +
            _PUSH_NULL_CONDITIONAL;

        macro(LOAD_ATTR_CLASS_WITH_METACLASS_CHECK) =
            unused/1 +
-            _RECORD_TOS_TYPE +
+            _RECORD_TOS +
            _GUARD_TYPE_VERSION +
            _CHECK_ATTR_CLASS +
            _LOAD_ATTR_CLASS +

@@ -229,8 +229,8 @@ dummy_func(void) {
    }

    op(_CHECK_ATTR_CLASS, (type_version/2, owner -- owner)) {
-        PyObject *type = (PyObject *)_PyType_LookupByVersion(type_version);
-        if (type) {
+        PyObject *type = sym_get_probable_value(owner);
+        if (type != NULL && ((PyTypeObject *)type)->tp_version_tag == type_version) {
            if (type == sym_get_const(ctx, owner)) {
                ADD_OP(_NOP, 0, 0);
            }
@@ -246,7 +246,7 @@ dummy_func(void) {

    op(_GUARD_TYPE_VERSION, (type_version/2, owner -- owner)) {
        assert(type_version);
-        assert(this_instr[-1].opcode == _RECORD_TOS_TYPE);
+        assert(this_instr[-1].opcode == _RECORD_TOS_TYPE || this_instr[-1].opcode == _RECORD_TOS);
        if (sym_matches_type_version(owner, type_version)) {
            ADD_OP(_NOP, 0, 0);
        }

diff --git a/Python/optimizer_cases.c.h b/Python/optimizer_cases.c.h
diff --git a/Python/record_functions.c.h b/Python/record_functions.c.h
-Original file line number
+Diff line change
@@ -229,8 +229,8 @@ dummy_func(void) {
         }
         op(_CHECK_ATTR_CLASS, (type_version/2, owner -- owner)) {
-            PyObject *type = (PyObject *)_PyType_LookupByVersion(type_version);
-            if (type) {
+            PyObject *type = sym_get_probable_value(owner);
+            if (type != NULL && ((PyTypeObject *)type)->tp_version_tag == type_version) {
                 if (type == sym_get_const(ctx, owner)) {
                     ADD_OP(_NOP, 0, 0);
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            Fidget-Spinner
  

      

      

      


        Apr 11, 2026



      
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      Btw, It think this is bugged on main, there needs to be a watcher installed on the type for this path similar to _GUARD_TYPE_VERSION. would you like to open a PR to fix it?
    
  
  



    

        
      
  
  
    
  
  
  
    
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            NekoAsakura
  

      

      

      


        Apr 11, 2026



      
    

  

  
    
      
          
    
  


        
            
  
      
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      Sure! Which issue should I link to?
    
  
  



    

        
      
  
  
    
  
  
  
    
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            Fidget-Spinner
  

      

      

      


        Apr 11, 2026



      
    

  

  
    
      
          
    
  


        
            
  
      
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      Thank you. I think it's fine to open a new issue describing the bug.
    
  
  



    

        
      
  
  
    
  
  
  
    
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                 }
@@ -246,7 +246,7 @@ dummy_func(void) {
         op(_GUARD_TYPE_VERSION, (type_version/2, owner -- owner)) {
             assert(type_version);
-            assert(this_instr[-1].opcode == _RECORD_TOS_TYPE);
+            assert(this_instr[-1].opcode == _RECORD_TOS_TYPE || this_instr[-1].opcode == _RECORD_TOS);
             if (sym_matches_type_version(owner, type_version)) {
                 ADD_OP(_NOP, 0, 0);
             }
-          Expand Down