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 package org.openjdk.bench.valhalla.acmp.trivial;
24 
25 import org.openjdk.jmh.annotations.Benchmark;
26 import org.openjdk.jmh.annotations.BenchmarkMode;
27 import org.openjdk.jmh.annotations.CompilerControl;
28 import org.openjdk.jmh.annotations.Fork;
29 import org.openjdk.jmh.annotations.Measurement;
30 import org.openjdk.jmh.annotations.Mode;
31 import org.openjdk.jmh.annotations.OperationsPerInvocation;
32 import org.openjdk.jmh.annotations.OutputTimeUnit;
33 import org.openjdk.jmh.annotations.Scope;
34 import org.openjdk.jmh.annotations.State;
35 import org.openjdk.jmh.annotations.Warmup;
36 
37 import java.util.concurrent.TimeUnit;
38 
39 /*
40  * to provide proper measurement the benchmark have to be executed in two modes:
41  *  -wm INDI
42  *  -wm BULK
43  */
44 @Fork(value = 1, jvmArgsAppend = {"--enable-preview"})
45 @Warmup(iterations = 3, time = 1)
46 @Measurement(iterations = 5, time = 1)
47 @OutputTimeUnit(TimeUnit.NANOSECONDS)
48 @BenchmarkMode(Mode.AverageTime)
49 @State(Scope.Thread)
50 public class Value {
51 
52     Object o1 = new ValueLong(1);
53     Object o2 = new ValueLong(2);
54 
55     @CompilerControl(CompilerControl.Mode.DONT_INLINE)
56     private static boolean cmpEquals(Object a, Object b) {
57         return a == b;     }
58 
59     @Benchmark
60     public boolean isCmp_null_null() {
61         return cmpEquals(null, null);
62     }
63 
64     @Benchmark
65     public boolean isCmp_o1_null() {
66         return cmpEquals(o1, null);
67     }
68 
69     @Benchmark
70     public boolean isCmp_null_o1() {
71         return cmpEquals(null, o1);
72     }
73 
74     @Benchmark
75     public boolean isCmp_o1_o1() {
76         return cmpEquals(o1, o1);
77     }
78 
79     @Benchmark
80     public boolean isCmp_o1_o2() {
81         return cmpEquals(o1, o2);
82     }
83 
84     public static value class ValueLong {
85 
86         public final long v0;
87 
88         public ValueLong(long v0) {
89             this.v0 = v0;
90         }
91 
92         public long value() {
93             return v0;
94         }
95 
96     }
97 
98 }