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23 package org.openjdk.bench.vm.compiler;
24 
25 import org.openjdk.jmh.annotations.*;
26 import org.openjdk.jmh.infra.*;
27 
28 import java.util.concurrent.TimeUnit;
29 
30 @BenchmarkMode(Mode.AverageTime)
31 @OutputTimeUnit(TimeUnit.NANOSECONDS)
32 @State(Scope.Thread)
33 public class BitSetAndReset {
34     private static final int COUNT = 10_000;
35 
36     private static final long MASK63 = 0x8000_0000_0000_0000L;
37     private static final long MASK31 = 0x0000_0000_8000_0000L;
38     private static final long MASK15 = 0x0000_0000_0000_8000L;
39     private static final long MASK00 = 0x0000_0000_0000_0001L;
40 
41     private long andq, orq;
42     private boolean success = true;
43 
44     @TearDown(Level.Iteration)
finish()45     public void finish() {
46         if (!success)
47             throw new AssertionError("Failure while setting or clearing long vector bits!");
48     }
49 
50     @Benchmark
bitSet(Blackhole bh)51     public void bitSet(Blackhole bh) {
52         for (int i=0; i<COUNT; i++) {
53             andq = MASK63 | MASK31 | MASK15 | MASK00;
54             orq = 0;
55             bh.consume(test63());
56             bh.consume(test31());
57             bh.consume(test15());
58             bh.consume(test00());
59             success &= andq == 0 && orq == (MASK63 | MASK31 | MASK15 | MASK00);
60         }
61     }
62 
test63()63     private long test63() {
64         andq &= ~MASK63;
65         orq |= MASK63;
66         return 0L;
67     }
test31()68     private long test31() {
69         andq &= ~MASK31;
70         orq |= MASK31;
71         return 0L;
72     }
test15()73     private long test15() {
74         andq &= ~MASK15;
75         orq |= MASK15;
76         return 0L;
77     }
test00()78     private long test00() {
79         andq &= ~MASK00;
80         orq |= MASK00;
81         return 0L;
82     }
83 
84     private static final long MASK62 = 0x4000_0000_0000_0000L;
85     private static final long MASK61 = 0x2000_0000_0000_0000L;
86     private static final long MASK60 = 0x1000_0000_0000_0000L;
87 
88     private long orq63, orq62, orq61, orq60;
89 
90     @Benchmark
throughput(Blackhole bh)91     public void throughput(Blackhole bh) {
92         for (int i=0; i<COUNT; i++) {
93             orq63 = orq62 = orq61 = orq60 = 0;
94             bh.consume(testTp());
95         }
96     }
97 
testTp()98     private long testTp() {
99         orq63 |= MASK63;
100         orq62 |= MASK62;
101         orq61 |= MASK61;
102         orq60 |= MASK60;
103         return 0L;
104     }
105 }
106