1 /*
   2  * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.loop.phases;
  24 
  25 import org.graalvm.compiler.debug.Debug;
  26 import org.graalvm.compiler.debug.DebugCounter;
  27 import org.graalvm.compiler.loop.LoopEx;
  28 import org.graalvm.compiler.loop.LoopPolicies;
  29 import org.graalvm.compiler.loop.LoopsData;
  30 import org.graalvm.compiler.nodes.StructuredGraph;
  31 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
  32 import org.graalvm.compiler.phases.tiers.PhaseContext;
  33 
  34 public class LoopFullUnrollPhase extends LoopPhase<LoopPolicies> {
  35 
  36     private static final DebugCounter FULLY_UNROLLED_LOOPS = Debug.counter("FullUnrolls");
  37     private final CanonicalizerPhase canonicalizer;
  38 
  39     public LoopFullUnrollPhase(CanonicalizerPhase canonicalizer, LoopPolicies policies) {
  40         super(policies);
  41         this.canonicalizer = canonicalizer;
  42     }
  43 
  44     @Override
  45     protected void run(StructuredGraph graph, PhaseContext context) {
  46         if (graph.hasLoops()) {
  47             boolean peeled;
  48             do {
  49                 peeled = false;
  50                 final LoopsData dataCounted = new LoopsData(graph);
  51                 dataCounted.detectedCountedLoops();
  52                 for (LoopEx loop : dataCounted.countedLoops()) {
  53                     if (getPolicies().shouldFullUnroll(loop)) {
  54                         Debug.log("FullUnroll %s", loop);
  55                         LoopTransformations.fullUnroll(loop, context, canonicalizer);
  56                         FULLY_UNROLLED_LOOPS.increment();
  57                         Debug.dump(Debug.INFO_LOG_LEVEL, graph, "FullUnroll %s", loop);
  58                         peeled = true;
  59                         break;
  60                     }
  61                 }
  62                 dataCounted.deleteUnusedNodes();
  63             } while (peeled);
  64         }
  65     }
  66 
  67     @Override
  68     public boolean checkContract() {
  69         return false;
  70     }
  71 }