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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/IterativeConditionalEliminationPhase.java @ 11881:da9db8331658

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moved Canonicalizable and Simplifiable to the com.oracle.graal.graph project (GRAAL-506)
author Doug Simon <doug.simon@oracle.com>
date Tue, 01 Oct 2013 20:38:25 +0200
parents 50577f991923
children 23ccaa863eda
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.phases.common;
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24
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25 import com.oracle.graal.api.code.*;
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26 import com.oracle.graal.graph.*;
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27 import com.oracle.graal.graph.spi.*;
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28 import com.oracle.graal.nodes.*;
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29 import com.oracle.graal.phases.*;
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30 import com.oracle.graal.phases.common.util.*;
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31 import com.oracle.graal.phases.tiers.*;
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32
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33 public class IterativeConditionalEliminationPhase extends BasePhase<PhaseContext> {
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34
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35 private static final int MAX_ITERATIONS = 256;
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36
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37 private final CanonicalizerPhase canonicalizer;
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38
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39 public IterativeConditionalEliminationPhase(CanonicalizerPhase canonicalizer) {
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40 this.canonicalizer = canonicalizer;
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41 }
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42
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43 @Override
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44 protected void run(StructuredGraph graph, PhaseContext context) {
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45 ConditionalEliminationPhase eliminate = new ConditionalEliminationPhase(context.getRuntime());
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46 HashSetNodeChangeListener listener = new HashSetNodeChangeListener();
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47 int count = 0;
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48 while (true) {
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49 graph.trackInputChange(listener);
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50 graph.trackUsagesDroppedZero(listener);
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51 eliminate.apply(graph);
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52 graph.stopTrackingInputChange();
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53 graph.stopTrackingUsagesDroppedZero();
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54 if (listener.getChangedNodes().isEmpty()) {
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55 break;
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56 }
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57 for (Node node : graph.getNodes()) {
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58 if (node instanceof Simplifiable) {
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59 listener.getChangedNodes().add(node);
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60 }
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61 }
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62 canonicalizer.applyIncremental(graph, context, listener.getChangedNodes());
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63 listener.getChangedNodes().clear();
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64 if (++count > MAX_ITERATIONS) {
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65 throw new BailoutException("Number of iterations in conditional elimination phase exceeds " + MAX_ITERATIONS);
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66 }
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67 }
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68 }
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69 }