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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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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.loop.phases;

import org.graalvm.compiler.core.common.GraalOptions;

import org.graalvm.compiler.debug.CounterKey;

import org.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.loop.LoopEx;

import org.graalvm.compiler.loop.LoopPolicies;

import org.graalvm.compiler.loop.LoopsData;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.spi.CoreProviders;

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

public class LoopFullUnrollPhase extends LoopPhase<LoopPolicies> {

    private static final CounterKey FULLY_UNROLLED_LOOPS = DebugContext.counter("FullUnrolls");

    private final CanonicalizerPhase canonicalizer;

    public LoopFullUnrollPhase(CanonicalizerPhase canonicalizer, LoopPolicies policies) {

        super(policies);

        this.canonicalizer = canonicalizer;

    }

    @Override

    protected void run(StructuredGraph graph, CoreProviders context) {

        if (GraalOptions.FullUnroll.getValue(graph.getOptions())) {

            DebugContext debug = graph.getDebug();

            if (graph.hasLoops()) {

                boolean peeled;

                do {

                    peeled = false;

                    final LoopsData dataCounted = new LoopsData(graph);

                    dataCounted.detectedCountedLoops();

                    for (LoopEx loop : dataCounted.countedLoops()) {

                        if (getPolicies().shouldFullUnroll(loop)) {

                            debug.log("FullUnroll %s", loop);

                            LoopTransformations.fullUnroll(loop, context, canonicalizer);

                            FULLY_UNROLLED_LOOPS.increment(debug);

                            debug.dump(DebugContext.DETAILED_LEVEL, graph, "FullUnroll %s", loop);

                            peeled = true;

                            break;

                        }

                    }

                    dataCounted.deleteUnusedNodes();

                } while (peeled);

            }

        }

    }

    @Override

    public boolean checkContract() {

        return false;

    }

}