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.vm.compiler.x86; 24 25 import org.openjdk.jmh.annotations.*; 26 27 import java.util.concurrent.TimeUnit; 28 29 @BenchmarkMode(Mode.AverageTime) 30 @OutputTimeUnit(TimeUnit.NANOSECONDS) 31 @Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS) 32 @Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS) 33 // Fix heap size since the StoreN benchmarks are allocating a lot and dependent on GC selection and compressed oop mode. 34 @Fork(value = 3, jvmArgsAppend = {"-Xms1g", "-Xmx1g"}) 35 @State(Scope.Thread) 36 public class RedundantLeaPeephole { 37 @State(Scope.Thread) 38 public class StoreNHelper { 39 Object o1; 40 Object o2; 41 42 public StoreNHelper(Object o1, Object o2) { 43 this.o1 = o1; 44 this.o2 = o2; 45 } 46 } 47 48 @State(Scope.Thread) 49 public class StringEqualsHelper { 50 private String str; 51 52 public StringEqualsHelper(String str) { 53 this.str = str; 54 } 55 56 @CompilerControl(CompilerControl.Mode.INLINE) 57 public boolean doEquals(String other) { 58 return this.str.equals(other); 59 } 60 } 61 62 private static final int SIZE = 42; 63 private static final int SMALL_IDX = 3; 64 private static final int BIG_IDX = 33; 65 66 private static final Object O1 = new Object(); 67 private static final Object O2 = new Object(); 68 69 private Object[] arr1 = new Object[SIZE]; 70 private Object[] arr2 = new Object[SIZE]; 71 private StoreNHelper[] arrH1 = new StoreNHelper[SIZE]; 72 private StoreNHelper[] arrH2 = new StoreNHelper[SIZE]; 73 74 private StringEqualsHelper strEqHelper = new StringEqualsHelper("foo"); 75 76 @Benchmark 77 @Fork(jvmArgsAppend = {"-XX:+UseSerialGC"}) 78 public void benchStoreNRemoveSpillSerial() { 79 this.arrH1[SMALL_IDX] = new StoreNHelper(O1, O2); 80 this.arrH2[BIG_IDX] = new StoreNHelper(O2, O1); 81 } 82 83 @Benchmark 84 @Fork(jvmArgsAppend = {"-XX:+UseParallelGC"}) 85 public void benchStoreNRemoveSpillParallel() { 86 this.arrH1[SMALL_IDX] = new StoreNHelper(O1, O2); 87 this.arrH2[BIG_IDX] = new StoreNHelper(O2, O1); 88 } 89 90 @Benchmark 91 @Fork(jvmArgsAppend = {"-XX:+UseSerialGC"}) 92 public void benchStoreNNoAllocSerial() { 93 this.arr1[SMALL_IDX] = O1; 94 this.arr1[BIG_IDX] = O2; 95 this.arr2[SMALL_IDX] = O1; 96 this.arr2[BIG_IDX] = O2; 97 } 98 99 @Benchmark 100 @Fork(jvmArgsAppend = {"-XX:+UseParallelGC"}) 101 public void benchStoreNNoAllocParallel() { 102 this.arr1[SMALL_IDX] = O1; 103 this.arr1[BIG_IDX] = O2; 104 this.arr2[SMALL_IDX] = O1; 105 this.arr2[BIG_IDX] = O2; 106 } 107 108 @Benchmark 109 public boolean benchStringEquals() { 110 return this.strEqHelper.doEquals("bar"); 111 } 112 }