GH-111772: Specialize slot loads and stores for _Py_T_OBJECT (GH-111773)

Author: markshannon

Misc/NEWS.d/next/Core and Builtins/2023-11-03-19-25-38.gh-issue-111772.aRQvOn.rst

@@ -0,0 +1 @@
+Specialize slot loads and stores for _Py_T_OBJECT as well as Py_T_OBJECT_EX

Python/specialize.c

@@ -742,7 +742,7 @@ analyze_descriptor(PyTypeObject *type, PyObject *name, PyObject **descr, int sto
         if (desc_cls == &PyMemberDescr_Type) {
             PyMemberDescrObject *member = (PyMemberDescrObject *)descriptor;
             struct PyMemberDef *dmem = member->d_member;
-            if (dmem->type == Py_T_OBJECT_EX) {
+            if (dmem->type == Py_T_OBJECT_EX || dmem->type == _Py_T_OBJECT) {
                 return OBJECT_SLOT;
             }
             return OTHER_SLOT;
@@ -942,7 +942,7 @@ _Py_Specialize_LoadAttr(PyObject *owner, _Py_CODEUNIT *instr, PyObject *name)
                 SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OUT_OF_RANGE);
                 goto fail;
             }
-            assert(dmem->type == Py_T_OBJECT_EX);
+            assert(dmem->type == Py_T_OBJECT_EX || dmem->type == _Py_T_OBJECT);
             assert(offset > 0);
             cache->index = (uint16_t)offset;
             write_u32(cache->version, type->tp_version_tag);
@@ -1082,7 +1082,7 @@ _Py_Specialize_StoreAttr(PyObject *owner, _Py_CODEUNIT *instr, PyObject *name)
                 SPECIALIZATION_FAIL(STORE_ATTR, SPEC_FAIL_OUT_OF_RANGE);
                 goto fail;
             }
-            assert(dmem->type == Py_T_OBJECT_EX);
+            assert(dmem->type == Py_T_OBJECT_EX || dmem->type == _Py_T_OBJECT);
             assert(offset > 0);
             cache->index = (uint16_t)offset;
             write_u32(cache->version, type->tp_version_tag);