Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/gen/PhiSimplifier.java @ 2791:6d14aa4fbf90
Gotos removed (except for exception dispatch chains and edge splitting).
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 25 May 2011 20:03:05 +0200 |
parents | 398b8fa5dc81 |
children | 189ffb7d1d84 |
rev | line source |
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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 |
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48 if (phi.valueCount() == 1) { |
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49 return (Value) phi.replace(phi.valueAt(0)); |
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50 } |
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51 |
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52 if (phi.checkFlag(Value.Flag.PhiCannotSimplify)) { |
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53 // already tried, cannot simplify this phi |
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54 return phi; |
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55 } else if (phi.checkFlag(Value.Flag.PhiVisited)) { |
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56 // break cycles in phis |
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57 return phi; |
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58 } else if (phi.isIllegal()) { |
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59 // don't bother with illegals |
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60 return phi; |
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61 } else { |
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62 // attempt to simplify the phi by recursively simplifying its operands |
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63 phi.setFlag(Value.Flag.PhiVisited); |
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64 Value phiSubst = null; |
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65 int max = phi.valueCount(); |
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66 boolean cannotSimplify = false; |
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67 for (int i = 0; i < max; i++) { |
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68 Value oldInstr = phi.valueAt(i); |
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69 |
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70 if (oldInstr == null || oldInstr.isIllegal() || oldInstr.isDeadPhi()) { |
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71 // if one operand is illegal, make the entire phi illegal |
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72 phi.makeDead(); |
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73 phi.clearFlag(Value.Flag.PhiVisited); |
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74 return phi; |
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75 } |
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76 |
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77 Value newInstr = simplify(oldInstr); |
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78 |
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79 if (newInstr == null || newInstr.isIllegal() || newInstr.isDeadPhi()) { |
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80 // if the subst instruction is illegal, make the entire phi illegal |
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81 phi.makeDead(); |
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82 phi.clearFlag(Value.Flag.PhiVisited); |
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83 return phi; |
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84 } |
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85 |
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86 // attempt to simplify this operand |
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87 if (!cannotSimplify) { |
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88 |
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89 if (newInstr != phi && newInstr != phiSubst) { |
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90 if (phiSubst == null) { |
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91 phiSubst = newInstr; |
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92 continue; |
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93 } |
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94 // this phi cannot be simplified |
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95 cannotSimplify = true; |
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96 } |
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97 } |
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98 } |
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99 if (cannotSimplify) { |
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100 phi.setFlag(Value.Flag.PhiCannotSimplify); |
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101 phi.clearFlag(Value.Flag.PhiVisited); |
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102 return phi; |
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103 } |
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104 |
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105 // successfully simplified the phi |
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106 assert phiSubst != null : "illegal phi function"; |
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107 phi.clearFlag(Value.Flag.PhiVisited); |
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108 return phiSubst; |
3fca504f28ba
Reinsert phi simplifier (does not seem to be optional). Disabled canonicalizer.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
109 } |
3fca504f28ba
Reinsert phi simplifier (does not seem to be optional). Disabled canonicalizer.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
110 } |
3fca504f28ba
Reinsert phi simplifier (does not seem to be optional). Disabled canonicalizer.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
111 } |