74 lines
2.6 KiB
Java
74 lines
2.6 KiB
Java
/*
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* Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package compiler.c2.irTests;
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import jdk.test.lib.Asserts;
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import compiler.lib.ir_framework.*;
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/*
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* @test
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* @bug 8286104
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* @summary Test that C2 uses aggressive liveness to get rid of the boxing object which is
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* only consumed by uncommon_trap.
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* @library /test/lib /
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* @run driver compiler.c2.irTests.TestOptimizeUnstableIf
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*/
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public class TestOptimizeUnstableIf {
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public static void main(String[] args) {
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TestFramework.run();
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}
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@Test
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@Arguments(values = {Argument.MAX}) // the argument needs to be big enough to fall out of cache.
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@IR(failOn = {IRNode.ALLOC_OF, "Integer"})
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public static int boxing_object(int value) {
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Integer ii = Integer.valueOf(value);
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int sum = 0;
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if (value > 999_999) {
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sum += ii.intValue();
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}
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return sum;
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}
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@Check(test = "boxing_object")
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public void checkWithTestInfo(int result, TestInfo info) {
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if (info.isWarmUp()) {
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// Accessing the cached boxing object during warm-up phase. It prevents parser from pruning that branch of Interger.valueOf();
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// This guarantees that a phi node is generated, which merge a cached object and the newly allocated object. eg.
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// 112: Phi === 108 168 188 [[ 50 ]] #java/lang/Integer:NotNull:exact * Oop:java/lang/Integer:NotNull:exact *
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// 168: a cached object
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// 188: result of AllocateNode
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// 50: uncommon_trap unstable_if
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value += Integer.valueOf(0);
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}
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Asserts.assertEQ(result, Integer.MAX_VALUE);
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}
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public static Integer value = Integer.valueOf(0);
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}
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