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