Add basic test

Author: aisk

Lib/test/test_capi/test_opt.py

@@ -2880,6 +2880,25 @@ def testfunc(n):
         self.assertIn("_POP_TOP_NOP", uops)
         self.assertLessEqual(count_ops(ex, "_POP_TOP"), 2)
 
+    def test_binary_op_extend_float_long_add_refcount_elimination(self):
+        def testfunc(n):
+            a = 1.5
+            b = 2
+            res = 0.0
+            for _ in range(n):
+                res = a + b
+            return res
+
+        res, ex = self._run_with_optimizer(testfunc, TIER2_THRESHOLD)
+        self.assertEqual(res, 3.5)
+        self.assertIsNotNone(ex)
+        uops = get_opnames(ex)
+        for uop in uops:
+            print(uop)
+        self.assertIn("_BINARY_OP_EXTEND", uops)
+        self.assertIn("_POP_TOP_NOP", uops)
+        self.assertLessEqual(count_ops(ex, "_POP_TOP"), 2)
+
     def test_remove_guard_for_slice_list(self):
         def f(n):
             for i in range(n):