1 /*
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23 
24 /**
25  * @test
26  * @bug 8280440
27  * @summary Test that speculative types are properly handled by scalarization.
28  * @library /test/lib
29  * @enablePreview
30  * @run main/othervm -XX:CompileCommand=dontinline,TestWithSpeculativeTypes::*
31  *                   -XX:TypeProfileLevel=222 -XX:-TieredCompilation -Xbatch
32  *                   TestWithSpeculativeTypes
33  */
34 
35 import jdk.test.lib.Asserts;
36 
37 public class TestWithSpeculativeTypes {
38 
39     static value class MyValue {
40         int x = 0;
41     }
42 
43     static MyValue getNull() {
44         return null;
45     }
46 
47     // Return value has speculative type NULL
48     static boolean test1() {
49         return getNull() == null;
50     }
51 
52     // Argument has speculative type NULL
53     static boolean test2(MyValue vt) {
54         return vt == null;
55     }
56 
57     public static void main(String[] args) {
58         // Make sure class is loaded
59         MyValue val = new MyValue();
60         for (int i = 0; i < 100_000; ++i) {
61             Asserts.assertTrue(test1());
62             Asserts.assertTrue(test2(null));
63         }
64     }
65 }