1 /*
 2  * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 package org.openjdk.bench.valhalla.loops.osr;
25 
26 import java.util.concurrent.TimeUnit;
27 
28 import org.openjdk.jmh.annotations.*;
29 
30 @BenchmarkMode(Mode.SingleShotTime)
31 @OutputTimeUnit(TimeUnit.MILLISECONDS)
32 @Fork(value = 1, jvmArgsAppend = {"--enable-preview"})
33 @Warmup(iterations = 0)
34 @Measurement(iterations = 10)
35 public class LarvalDetectionAboveOSR {
36     @Benchmark
37     public long test() {
38         return MyNumber.loop();
39     }
40 }
41 
42 value class MyNumber {
43     static int MANY = 1_000_000_000;
44     private long d0;
45 
46     MyNumber(long d0) {
47         this.d0 = d0;
48     }
49 
50     MyNumber add(long v) {
51         return new MyNumber(d0 + v);
52     }
53 
54     public static long loop() {
55         MyNumber dec = new MyNumber(123);
56         for (int i = 0; i < MANY; ++i) {
57             dec = dec.add(i);
58         }
59         return dec.d0;
60     }
61 }
62