001/*
002 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.loop.phases;
024
025import com.oracle.graal.debug.*;
026
027import com.oracle.graal.loop.*;
028import com.oracle.graal.nodes.*;
029import com.oracle.graal.phases.*;
030import com.oracle.graal.phases.common.*;
031import com.oracle.graal.phases.tiers.*;
032
033public class LoopFullUnrollPhase extends BasePhase<PhaseContext> {
034
035    private static final DebugMetric FULLY_UNROLLED_LOOPS = Debug.metric("FullUnrolls");
036    private final CanonicalizerPhase canonicalizer;
037
038    public LoopFullUnrollPhase(CanonicalizerPhase canonicalizer) {
039        this.canonicalizer = canonicalizer;
040    }
041
042    @Override
043    protected void run(StructuredGraph graph, PhaseContext context) {
044        if (graph.hasLoops()) {
045            boolean peeled;
046            do {
047                peeled = false;
048                final LoopsData dataCounted = new LoopsData(graph);
049                dataCounted.detectedCountedLoops();
050                for (LoopEx loop : dataCounted.countedLoops()) {
051                    if (LoopPolicies.shouldFullUnroll(loop)) {
052                        Debug.log("FullUnroll %s", loop);
053                        LoopTransformations.fullUnroll(loop, context, canonicalizer);
054                        FULLY_UNROLLED_LOOPS.increment();
055                        Debug.dump(graph, "FullUnroll %s", loop);
056                        peeled = true;
057                        break;
058                    }
059                }
060                dataCounted.deleteUnusedNodes();
061            } while (peeled);
062        }
063    }
064}