/*

 * Copyright (c) 2012, 2012, 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.

 *

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package org.graalvm.compiler.loop.phases;

import org.graalvm.compiler.debug.Debug;

import org.graalvm.compiler.debug.DebugCounter;

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.phases.common.CanonicalizerPhase;

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

public class LoopFullUnrollPhase extends LoopPhase<LoopPolicies> {

    private static final DebugCounter FULLY_UNROLLED_LOOPS = Debug.counter("FullUnrolls");

    private final CanonicalizerPhase canonicalizer;

    public LoopFullUnrollPhase(CanonicalizerPhase canonicalizer, LoopPolicies policies) {

        super(policies);

        this.canonicalizer = canonicalizer;

    }

    @Override

    protected void run(StructuredGraph graph, PhaseContext context) {

        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.dump(Debug.INFO_LOG_LEVEL, graph, "FullUnroll %s", loop);

                        peeled = true;

                        break;

                    }

                }

                dataCounted.deleteUnusedNodes();

            } while (peeled);

        }

    }

    @Override

    public boolean checkContract() {

        return false;

    }

}