python · corona10 · Dec 11, 2025 · Jun 29, 2025 · Jun 29, 2025 · Jun 29, 2025
diff --git a/Include/internal/pycore_opcode_metadata.h b/Include/internal/pycore_opcode_metadata.h
diff --git a/Include/internal/pycore_uop_ids.h b/Include/internal/pycore_uop_ids.h
diff --git a/Include/internal/pycore_uop_metadata.h b/Include/internal/pycore_uop_metadata.h
diff --git a/Lib/test/test_capi/test_opt.py b/Lib/test/test_capi/test_opt.py
@@ -2051,6 +2051,7 @@ def testfunc(n):
        self.assertIn("_CALL_LEN", uops)
        self.assertNotIn("_GUARD_NOS_INT", uops)
        self.assertNotIn("_GUARD_TOS_INT", uops)
+        self.assertIn("_POP_TOP_NOP", uops)

    def test_call_len_known_length_small_int(self):
        # Make sure that len(t) is optimized for a tuple of length 5.

@@ -4282,17 +4282,18 @@ dummy_func(
            unused/2 +
            _GUARD_NOS_NULL +
            _GUARD_CALLABLE_LEN +
-            _CALL_LEN;
+            _CALL_LEN +
+            POP_TOP +
+            POP_TOP;

        op(_GUARD_CALLABLE_LEN, (callable, unused, unused -- callable, unused, unused)){
            PyObject *callable_o = PyStackRef_AsPyObjectBorrow(callable);
            PyInterpreterState *interp = tstate->interp;
            DEOPT_IF(callable_o != interp->callable_cache.len);
        }

-        op(_CALL_LEN, (callable, null, arg -- res)) {
+        op(_CALL_LEN, (callable, null, arg -- res, a, c)) {
            /* len(o) */
-            (void)null;
            STAT_INC(CALL, hit);
            PyObject *arg_o = PyStackRef_AsPyObjectBorrow(arg);
            Py_ssize_t len_i = PyObject_Length(arg_o);
@@ -4304,9 +4305,9 @@ dummy_func(
            if (res_o == NULL) {
                ERROR_NO_POP();
            }
-            PyStackRef_CLOSE(arg);
-            DEAD(null);
-            PyStackRef_CLOSE(callable);
+            a = arg;
+            c = callable;
+            INPUTS_DEAD();
            res = PyStackRef_FromPyObjectSteal(res_o);
        }


diff --git a/Python/executor_cases.c.h b/Python/executor_cases.c.h
diff --git a/Python/generated_cases.c.h b/Python/generated_cases.c.h
@@ -1201,7 +1201,7 @@ dummy_func(void) {
        sym_set_const(callable, (PyObject *)&PyUnicode_Type);
    }

-    op(_CALL_LEN, (callable, null, arg -- res)) {
+    op(_CALL_LEN, (callable, null, arg -- res, a, c)) {
        res = sym_new_type(ctx, &PyLong_Type);
        Py_ssize_t tuple_length = sym_tuple_length(arg);
        if (tuple_length >= 0) {
@@ -1216,6 +1216,8 @@ dummy_func(void) {
            res = sym_new_const(ctx, temp);
            Py_DECREF(temp);
        }
+        a = arg;
+        c = callable;
    }

    op(_GET_LEN, (obj -- obj, len)) {

diff --git a/Python/optimizer_cases.c.h b/Python/optimizer_cases.c.h