65 lines
2.3 KiB
Java
65 lines
2.3 KiB
Java
/*
|
|
* Copyright (c) 2021, 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
|
|
* questions.
|
|
*/
|
|
|
|
/**
|
|
* @test
|
|
* @bug 8262739
|
|
* @summary Test correct insertion of anti-dependencies after String inflation.
|
|
* @run main/othervm -Xbatch
|
|
* compiler.controldependency.TestAntiDependencyAfterStringInflation
|
|
*/
|
|
|
|
package compiler.controldependency;
|
|
|
|
public class TestAntiDependencyAfterStringInflation {
|
|
|
|
static String reverseString(String str) {
|
|
int size = str.length();
|
|
char[] buffer = new char[size];
|
|
reverse(str, buffer, size);
|
|
return new String(buffer, 0, size);
|
|
}
|
|
|
|
static void reverse(String str, char[] buffer, int size) {
|
|
// Inflate String.value byte[] to char[]
|
|
str.getChars(0, size, buffer, 0);
|
|
// Reverse String by copying buffer elements. This will fail
|
|
// if C2 does not insert anti-dependencies between loads/stores.
|
|
int half = size / 2;
|
|
for (int l = 0, r = size - 1; l < half; l++, r--) {
|
|
char tmp = buffer[l];
|
|
buffer[l] = buffer[r];
|
|
buffer[r] = tmp;
|
|
}
|
|
}
|
|
|
|
public static void main(String[] args) throws Exception {
|
|
for (int i = 0; i < 50_000; i++) {
|
|
String res = reverseString("0123456789");
|
|
if (!res.equals("9876543210")) {
|
|
throw new RuntimeException("Unexpected result: " + res);
|
|
}
|
|
}
|
|
}
|
|
}
|