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annotate graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/loop/CountedLoopInfo.java @ 5675:776366f3a41a

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A bit of work on counted loops Introduce FullUnroll phase before EscapeAnalysis split Loop transforms into 2 phase : things that run before lowering, and things that run after lowering Introduce Reassociate invariants after lowering
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 21 Jun 2012 16:35:23 +0200
parents 9f3250602d69
children
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1 /*
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2 * Copyright (c) 2012, 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.compiler.loop;
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24
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25 import com.oracle.graal.compiler.loop.InductionVariable.*;
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26 import com.oracle.graal.nodes.*;
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27 import com.oracle.graal.nodes.calc.*;
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28
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29 public class CountedLoopInfo {
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30 private final LoopEx loop;
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31 private InductionVariable iv;
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32 private ValueNode end;
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33 private boolean oneOff;
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34
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35 CountedLoopInfo(LoopEx loop, InductionVariable iv, ValueNode end, boolean oneOff) {
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36 this.loop = loop;
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37 this.iv = iv;
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38 this.end = end;
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39 this.oneOff = oneOff;
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40 }
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41
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42 public ValueNode maxTripCountNode() {
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43 //TODO (gd) stuarte and respect oneOff
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44 return IntegerArithmeticNode.div(IntegerArithmeticNode.sub(end, iv.initNode()), iv.strideNode());
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45 }
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46
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47 public boolean isConstantMaxTripCount() {
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48 return end instanceof ConstantNode && iv.isConstantInit() && iv.isConstantStride();
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49 }
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50
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51 public long constantMaxTripCount() {
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52 long off = oneOff ? iv.direction() == Direction.Up ? 1 : -1 : 0;
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53 long max = (((ConstantNode) end).asConstant().asLong() + off - iv.constantInit()) / iv.constantStride();
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54 return Math.max(0, max);
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55 }
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56
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57 public boolean isExactTripCount() {
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58 return loop.loopBegin().loopExits().count() == 1;
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59 }
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60
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61 public ValueNode exactTripCountNode() {
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62 assert isExactTripCount();
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63 return maxTripCountNode();
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64 }
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65
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66 public boolean isConstantExactTripCount() {
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67 assert isExactTripCount();
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68 return isConstantMaxTripCount();
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69 }
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70
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71 public long constantExactTripCount() {
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72 assert isExactTripCount();
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73 return constantMaxTripCount();
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74 }
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76 @Override
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77 public String toString() {
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78 return "iv=" + iv + " until " + end + (oneOff ? iv.direction() == Direction.Up ? "+1" : "-1" : "");
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79 }
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80 }