8268231: Aarch64: Use ldp in intrinsics for String.compareTo #4722
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /* | ||
| * Copyright (c) 2021, Huawei Technologies Co. Ltd. All rights reserved. | ||
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| * | ||
| * This code is free software; you can redistribute it and/or modify it | ||
| * under the terms of the GNU General Public License version 2 only, as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| * version 2 for more details (a copy is included in the LICENSE file that | ||
| * accompanied this code). | ||
| * | ||
| * You should have received a copy of the GNU General Public License version | ||
| * 2 along with this work; if not, write to the Free Software Foundation, | ||
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| * | ||
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| * or visit www.oracle.com if you need additional information or have any | ||
| * questions. | ||
| */ | ||
| package org.openjdk.bench.java.lang; | ||
|
|
||
| import org.openjdk.jmh.annotations.*; | ||
| import java.util.concurrent.TimeUnit; | ||
|
|
||
| /* | ||
| * This benchmark naively explores String::compare performance | ||
| */ | ||
| @BenchmarkMode(Mode.AverageTime) | ||
| @OutputTimeUnit(TimeUnit.MICROSECONDS) | ||
| @State(Scope.Benchmark) | ||
| public class StringCompare { | ||
| @Param({"128"}) | ||
| int size; | ||
|
|
||
| @Param({"7", "15", "31", "47", "63", "127"}) | ||
| int diff_pos; | ||
|
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| private String str1; | ||
| private String str2; | ||
|
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| @Setup(Level.Trial) | ||
| public void init() { | ||
| str1 = newString(size, 'c', diff_pos, '1'); | ||
| str2 = newString(size, 'c', diff_pos, '2'); | ||
| } | ||
|
|
||
| public String newString(int length, char charToFill, int diff_pos, char diff_char) { | ||
| if (length > 0) { | ||
| char[] array = new char[length]; | ||
| for (int i = 0; i < length; i++) { | ||
| array[i] = charToFill; | ||
| } | ||
| //Arrays.fill(array, charToFill); | ||
| array[diff_pos] = diff_char; | ||
| return new String(array); | ||
| } | ||
| return ""; | ||
| } | ||
|
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||
| @Benchmark | ||
| @CompilerControl(CompilerControl.Mode.DONT_INLINE) | ||
| public int compareLLDiffStrings() { | ||
| int result = 0; | ||
| for (int i = 0; i < 1000; i++) { | ||
| result ^= str1.compareTo(str2); | ||
| } | ||
| return result; | ||
| } | ||
|
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| @Benchmark | ||
| @Fork(jvmArgsAppend = { "-XX:+UseStringCompareWithLdp"}) | ||
| @CompilerControl(CompilerControl.Mode.DONT_INLINE) | ||
| public int compareLLDiffStringsWithLdp() { | ||
| int result = 0; | ||
| for (int i = 0; i < 1000; i++) { | ||
| result ^= str1.compareTo(str2); | ||
| } | ||
| return result; | ||
| } | ||
|
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| @Benchmark | ||
| @Fork(jvmArgsAppend = {"-XX:-CompactStrings"}) | ||
| @CompilerControl(CompilerControl.Mode.DONT_INLINE) | ||
| public int compareUUDiffStrings() { | ||
| int result = 0; | ||
| for (int i = 0; i < 1000; i++) { | ||
| result ^= str1.compareTo(str2); | ||
| } | ||
| return result; | ||
| } | ||
|
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| @Benchmark | ||
| @Fork(jvmArgsAppend = {"-XX:-CompactStrings", "-XX:+UseStringCompareWithLdp"}) | ||
| @CompilerControl(CompilerControl.Mode.DONT_INLINE) | ||
| public int compareUUDiffStringsWithLdp() { | ||
| int result = 0; | ||
| for (int i = 0; i < 1000; i++) { | ||
| result ^= str1.compareTo(str2); | ||
| } | ||
| return result; | ||
| } | ||
| } | ||
|
|
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The indentation of the
ifseems wrong here: shouldn't it line up with the assembly block like theifon line 4989? Also needs a space before the parenthesis.