Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/gen/PhiSimplifier.java @ 2788:df4c5254c5cc
Towards goto removal.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 25 May 2011 14:33:44 +0200 |
parents | 398b8fa5dc81 |
children | 6d14aa4fbf90 |
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1 /* |
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2 * Copyright (c) 2009, 2011, 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.sun.c1x.gen; |
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24 |
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25 import com.oracle.graal.graph.*; |
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26 import com.sun.c1x.graph.*; |
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27 import com.sun.c1x.ir.*; |
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28 |
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29 /** |
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30 * The {@code PhiSimplifier} class is a helper class that can reduce phi instructions. |
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31 */ |
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32 public final class PhiSimplifier { |
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33 |
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34 public PhiSimplifier(IR ir) { |
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35 for (Node n : ir.compilation.graph.getNodes()) { |
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36 if (n instanceof Phi) { |
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37 simplify((Phi) n); |
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38 } |
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39 } |
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40 } |
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41 |
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42 private Value simplify(Value x) { |
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43 if (x == null || !(x instanceof Phi)) { |
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44 return x; |
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45 } |
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46 Phi phi = (Phi) x; |
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47 if (phi.checkFlag(Value.Flag.PhiCannotSimplify)) { |
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48 // already tried, cannot simplify this phi |
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49 return phi; |
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50 } else if (phi.checkFlag(Value.Flag.PhiVisited)) { |
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51 // break cycles in phis |
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52 return phi; |
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53 } else if (phi.isIllegal()) { |
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54 // don't bother with illegals |
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55 return phi; |
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56 } else { |
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57 // attempt to simplify the phi by recursively simplifying its operands |
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58 phi.setFlag(Value.Flag.PhiVisited); |
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59 Value phiSubst = null; |
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60 int max = phi.valueCount(); |
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61 boolean cannotSimplify = false; |
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62 for (int i = 0; i < max; i++) { |
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63 Value oldInstr = phi.valueAt(i); |
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64 |
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65 if (oldInstr == null || oldInstr.isIllegal() || oldInstr.isDeadPhi()) { |
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66 // if one operand is illegal, make the entire phi illegal |
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67 phi.makeDead(); |
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68 phi.clearFlag(Value.Flag.PhiVisited); |
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69 return phi; |
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70 } |
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71 |
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72 Value newInstr = simplify(oldInstr); |
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73 |
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74 if (newInstr == null || newInstr.isIllegal() || newInstr.isDeadPhi()) { |
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75 // if the subst instruction is illegal, make the entire phi illegal |
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76 phi.makeDead(); |
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77 phi.clearFlag(Value.Flag.PhiVisited); |
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78 return phi; |
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79 } |
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80 |
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81 // attempt to simplify this operand |
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82 if (!cannotSimplify) { |
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83 |
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84 if (newInstr != phi && newInstr != phiSubst) { |
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85 if (phiSubst == null) { |
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86 phiSubst = newInstr; |
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87 continue; |
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88 } |
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89 // this phi cannot be simplified |
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90 cannotSimplify = true; |
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91 } |
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92 } |
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93 } |
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94 if (cannotSimplify) { |
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95 phi.setFlag(Value.Flag.PhiCannotSimplify); |
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96 phi.clearFlag(Value.Flag.PhiVisited); |
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97 return phi; |
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98 } |
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99 |
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100 // successfully simplified the phi |
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101 assert phiSubst != null : "illegal phi function"; |
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102 phi.clearFlag(Value.Flag.PhiVisited); |
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103 return phiSubst; |
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104 } |
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105 } |
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106 } |