--- /dev/null 2017-01-22 10:16:57.869617664 -0800 +++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/LongNodeChainTest.java 2017-02-15 16:57:39.997151513 -0800 @@ -0,0 +1,90 @@ +/* + * Copyright (c) 2015, 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. + */ +package org.graalvm.compiler.core.test; + +import jdk.vm.ci.meta.JavaConstant; + +import static org.graalvm.compiler.core.common.CompilationIdentifier.INVALID_COMPILATION_ID; + +import org.junit.Assert; +import org.junit.Test; + +import org.graalvm.compiler.nodes.ConstantNode; +import org.graalvm.compiler.nodes.ReturnNode; +import org.graalvm.compiler.nodes.StructuredGraph; +import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions; +import org.graalvm.compiler.nodes.ValueNode; +import org.graalvm.compiler.nodes.calc.AddNode; +import org.graalvm.compiler.nodes.debug.OpaqueNode; +import org.graalvm.compiler.phases.common.CanonicalizerPhase; +import org.graalvm.compiler.phases.schedule.SchedulePhase; +import org.graalvm.compiler.phases.schedule.SchedulePhase.SchedulingStrategy; +import org.graalvm.compiler.phases.tiers.HighTierContext; + +public class LongNodeChainTest extends GraalCompilerTest { + + public static final int N = 10000; + + private static final SchedulingStrategy[] Strategies = new SchedulingStrategy[]{SchedulingStrategy.EARLIEST}; + + @Test + public void testLongAddChain() { + longAddChain(true); + longAddChain(false); + } + + private void longAddChain(boolean reverse) { + HighTierContext context = getDefaultHighTierContext(); + StructuredGraph graph = new StructuredGraph(AllowAssumptions.NO, INVALID_COMPILATION_ID); + ValueNode constant = graph.unique(ConstantNode.forPrimitive(JavaConstant.INT_1)); + ValueNode value = null; + if (reverse) { + // Make sure the constant's stamp is not used to infer the add node's stamp. + OpaqueNode opaque = graph.unique(new OpaqueNode(constant)); + constant = opaque; + AddNode addNode = graph.unique(new AddNode(constant, constant)); + value = addNode; + for (int i = 1; i < N; ++i) { + AddNode newAddNode = graph.addWithoutUnique(new AddNode(constant, constant)); + addNode.setY(newAddNode); + addNode = newAddNode; + } + opaque.replaceAndDelete(opaque.getValue()); + } else { + value = constant; + for (int i = 0; i < N; ++i) { + value = graph.unique(new AddNode(constant, value)); + } + } + ReturnNode returnNode = graph.add(new ReturnNode(value)); + graph.start().setNext(returnNode); + + for (SchedulingStrategy s : Strategies) { + new SchedulePhase(s).apply(graph); + } + + new CanonicalizerPhase().apply(graph, context); + JavaConstant asConstant = (JavaConstant) returnNode.result().asConstant(); + Assert.assertEquals(N + 1, asConstant.asInt()); + } +}