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8341696: C2: Non-fluid StringBuilder pattern bails out in OptoStringConcat

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Reviewed-by: epeter
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Theo Weidmann 2025-01-23 08:41:02 +00:00 • committed by Emanuel Peter
parent caa3c78f78
commit 6032f6ea04
4 changed files with 315 additions and 67 deletions
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test/micro/org/openjdk/bench/vm/compiler/FluidSBBench.java Normal file
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/*
* Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
* Copyright (c) 2025, Oracle and/or its affiliates. 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
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*/
package org.openjdk.bench.vm.compiler;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Scope;
import java.util.concurrent.TimeUnit;
@Warmup(iterations = 3, time = 300, timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 3, time = 300, timeUnit = TimeUnit.MILLISECONDS)
@Fork(value = 1, jvmArgsAppend = {"-XX:+UseParallelGC", "-Xmx1g", "-Xms1g"})
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
public class FluidSBBench {
static final String PREFIX = "a";
String foo = "aaaaa aaaaa aaaaa aaaaa aaaaa";
@Benchmark
public String fluid() {
return new StringBuilder().append(PREFIX).append(foo).toString();
}
@Benchmark
public String nonFluid() {
final StringBuilder sb = new StringBuilder();
sb.append(PREFIX);
sb.append(foo);
return sb.toString();
}
}