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8221723: Avoid storing zero to String.hash

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Reviewed-by: shade, prappo, jiangli
This commit is contained in:
Claes Redestad 2019-04-02 11:24:40 +02:00
parent 6bce53795b
commit 1908897b93
2 changed files with 20 additions and 3 deletions
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13
test/micro/org/openjdk/bench/java/lang/StringHashCode.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2019, 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
@ -42,11 +42,13 @@ public class StringHashCode {
private String hashcode;
private String hashcode0;
private String empty;
@Setup
public void setup() {
hashcode = "abcdefghijkl";
hashcode0 = new String(new char[]{72, 90, 100, 89, 105, 2, 72, 90, 100, 89, 105, 2});
empty = new String();
}
/**
@ -66,4 +68,13 @@ public class StringHashCode {
public int notCached() {
return hashcode0.hashCode();
}
/**
* Benchmark testing String.hashCode() with the empty string. Since the
* empty String has hashCode = 0, this value is always recalculated.
*/
@Benchmark
public int empty() {
return empty.hashCode();
}
}