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/*
* Copyright Amazon.com Inc. 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.
*/
package compiler.c2.irTests;
import jdk.test.lib.Asserts;
import compiler.lib.ir_framework.*;
/*
* @test
* @bug 8286104
* @summary Test that C2 uses aggressive liveness to get rid of the boxing object which is
* only consumed by uncommon_trap.
* @library /test/lib /
* @run driver compiler.c2.irTests.TestOptimizeUnstableIf
*/
public class TestOptimizeUnstableIf {
public static void main(String[] args) {
TestFramework.run();
}
@Test
@Arguments(values = {Argument.MAX}) // the argument needs to be big enough to fall out of cache.
@IR(failOn = {IRNode.ALLOC_OF, "Integer"})
public static int boxing_object(int value) {
Integer ii = Integer.valueOf(value);
int sum = 0;
if (value > 999_999) {
sum += ii.intValue();
}
return sum;
}
@Check(test = "boxing_object")
public void checkWithTestInfo(int result, TestInfo info) {
if (info.isWarmUp()) {
// Accessing the cached boxing object during warm-up phase. It prevents parser from pruning that branch of Interger.valueOf();
// This guarantees that a phi node is generated, which merge a cached object and the newly allocated object. eg.
// 112: Phi === 108 168 188 [[ 50 ]] #java/lang/Integer:NotNull:exact * Oop:java/lang/Integer:NotNull:exact *
// 168: a cached object
// 188: result of AllocateNode
// 50: uncommon_trap unstable_if
value += Integer.valueOf(0);
}
Asserts.assertEQ(result, Integer.MAX_VALUE);
}
public static Integer value = Integer.valueOf(0);
}
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