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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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package org.graalvm.compiler.core.test;

import org.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.nodes.ReturnNode;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;

import org.graalvm.compiler.phases.OptimisticOptimizations;

import org.graalvm.compiler.phases.OptimisticOptimizations.Optimization;

import org.graalvm.compiler.phases.common.CanonicalizerPhase;

import org.graalvm.compiler.phases.tiers.HighTierContext;

import org.junit.Test;

public class MergeCanonicalizerTest extends GraalCompilerTest {

    /**

     * These tests assume all code paths are reachable so disable profile based dead code removal.

     */

    @Override

    protected HighTierContext getDefaultHighTierContext() {

        return new HighTierContext(getProviders(), getDefaultGraphBuilderSuite(), OptimisticOptimizations.ALL.remove(Optimization.RemoveNeverExecutedCode));

    }

    public static int staticField;

    private int field;

    @Test

    public void testSplitReturn() {

        test("testSplitReturnSnippet", 2);

        testReturnCount("testSplitReturnSnippet", 2);

    }

    public int testSplitReturnSnippet(int b) {

        int v;

        if (b < 0) {

            staticField = 1;

            v = 10;

        } else {

            staticField = 2;

            v = 20;

        }

        int i = field;

        i = field + i;

        return v;

    }

    private void testReturnCount(String snippet, int returnCount) {

        StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);

        new CanonicalizerPhase().apply(graph, getProviders());

        new CanonicalizerPhase().apply(graph, getProviders());

        graph.getDebug().dump(DebugContext.BASIC_LEVEL, graph, "Graph");

        assertDeepEquals(returnCount, graph.getNodes(ReturnNode.TYPE).count());

    }

}