1 /* 2 * Copyright (c) 2019, 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.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) 45 public void finish() { 46 if (!success) 47 throw new AssertionError("Failure while setting or clearing long vector bits!"); 48 } 49 50 @Benchmark 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 63 private long test63() { 64 andq &= ~MASK63; 65 orq |= MASK63; 66 return 0L; 67 } 68 private long test31() { 69 andq &= ~MASK31; 70 orq |= MASK31; 71 return 0L; 72 } 73 private long test15() { 74 andq &= ~MASK15; 75 orq |= MASK15; 76 return 0L; 77 } 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 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 98 private long testTp() { 99 orq63 |= MASK63; 100 orq62 |= MASK62; 101 orq61 |= MASK61; 102 orq60 |= MASK60; 103 return 0L; 104 } 105 }