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

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
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 *
 * 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.
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package org.graalvm.compiler.core.test;

import org.junit.Test;

import org.graalvm.compiler.debug.Debug;
import org.graalvm.compiler.nodes.FrameState;
import org.graalvm.compiler.nodes.StructuredGraph;
import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
import org.graalvm.compiler.nodes.util.GraphUtil;
import org.graalvm.compiler.phases.common.CanonicalizerPhase;
import org.graalvm.compiler.phases.tiers.PhaseContext;

public class PushThroughIfTest extends GraalCompilerTest {

    public int field1;
    public int field2;

    public int testSnippet(boolean b) {
        int i;
        if (b) {
            i = field1;
        } else {
            i = field1;
        }
        return i + field2;
    }

    @SuppressWarnings("unused")
    public int referenceSnippet(boolean b) {
        return field1 + field2;
    }

    @Test
    public void test1() {
        test("testSnippet", "referenceSnippet");
    }

    private void test(String snippet, String reference) {
        StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
        Debug.dump(Debug.BASIC_LOG_LEVEL, graph, "Graph");
        for (FrameState fs : graph.getNodes(FrameState.TYPE).snapshot()) {
            fs.replaceAtUsages(null);
            GraphUtil.killWithUnusedFloatingInputs(fs);
        }
        new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
        new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));

        StructuredGraph referenceGraph = parseEager(reference, AllowAssumptions.YES);
        for (FrameState fs : referenceGraph.getNodes(FrameState.TYPE).snapshot()) {
            fs.replaceAtUsages(null);
            GraphUtil.killWithUnusedFloatingInputs(fs);
        }
        new CanonicalizerPhase().apply(referenceGraph, new PhaseContext(getProviders()));
        assertEquals(referenceGraph, graph);
    }
}