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8247681: Improve bootstrapping of unary concatenations

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Reviewed-by: jlaskey, psandoz
This commit is contained in:
Claes Redestad 2020-06-17 19:36:26 +02:00
parent 1d87958ead
commit 34c79640e7
6 changed files with 149 additions and 19 deletions
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16
test/micro/org/openjdk/bench/java/lang/StringConcat.java
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@ -24,11 +24,14 @@ package org.openjdk.bench.java.lang;
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.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
import java.util.concurrent.TimeUnit;
@ -38,6 +41,9 @@ import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@Warmup(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
@Fork(3)
public class StringConcat {
@Param("4711")
@ -73,6 +79,16 @@ public class StringConcat {
return emptyString + stringValue;
}
@Benchmark
public String concatEmptyConstInt() {
return "" + intValue;
}
@Benchmark
public String concatEmptyConstString() {
return "" + stringValue;
}
@Benchmark
public String concatMethodConstString() {
return "string".concat(stringValue);