hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/LongNodeChainTest.java

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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());
    }
}