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/*
* Copyright (c) 2024, 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 8322854
* @summary Check that the RAM optimization works when there is a memory loop.
* @library /test/lib /
* @requires vm.compiler2.enabled
* @run main/othervm -XX:CompileCommand=compileonly,*TestReduceAllocationAndMemoryLoop*::test*
* -XX:-TieredCompilation -Xbatch
* compiler.c2.TestReduceAllocationAndMemoryLoop
*/
package compiler.c2;
public class TestReduceAllocationAndMemoryLoop {
public static void main(String[] args) throws Exception {
// Warmup
for (int i = 0; i < 50_000; ++i) {
test(false, 10);
}
// Trigger deoptimization
MyClass obj = test(false, 11);
if (obj.val != 42) {
throw new RuntimeException("Test failed, val = " + obj.val);
}
}
static class MyClass {
final int val;
public MyClass(int val) {
this.val = val;
}
}
public static MyClass test(boolean alwaysFalse, int limit) {
for (int i = 0; ; ++i) {
MyClass obj = new MyClass(42);
if (alwaysFalse || i > 10) {
return obj;
}
if (i == limit) {
return null;
}
}
}
}
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