Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/gen/PhiSimplifier.java @ 2751:0fe79e7435c3
More scheduling. Removed need for cfg iteration in the phi simplifier.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Fri, 20 May 2011 14:22:22 +0200 |
parents | 88123130ede6 |
children | 0c5791bc90fb |
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 import com.sun.c1x.value.*; |
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29 |
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30 /** |
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31 * The {@code PhiSimplifier} class is a helper class that can reduce phi instructions. |
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32 * |
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33 * @author Ben L. Titzer |
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34 */ |
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35 public final class PhiSimplifier implements BlockClosure { |
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36 |
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37 final IR ir; |
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38 |
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39 public PhiSimplifier(IR ir) { |
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40 this.ir = ir; |
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41 //ir.getHIRStartBlock().iterateAnyOrder(this, false); |
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42 |
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43 for (Node n : ir.compilation.graph.getNodes()) { |
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44 if (n instanceof Phi) { |
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45 simplify((Phi)n); |
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46 } |
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47 } |
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48 |
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49 |
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50 } |
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51 |
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52 /** |
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53 * This method is called for each block and processes any phi statements in the block. |
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54 * @param block the block to apply the simplification to |
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55 */ |
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56 public void apply(BlockBegin block) { |
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57 FrameState state = block.stateBefore(); |
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58 for (int i = 0; i < state.stackSize(); i++) { |
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59 simplify(state.stackAt(i)); |
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60 } |
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61 for (int i = 0; i < state.localsSize(); i++) { |
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62 simplify(state.localAt(i)); |
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63 } |
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64 } |
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65 |
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66 Value simplify(Value x) { |
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67 if (x == null || !(x instanceof Phi)) { |
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68 return x; |
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69 } |
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70 Phi phi = (Phi) x; |
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71 if (phi.checkFlag(Value.Flag.PhiCannotSimplify)) { |
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72 // already tried, cannot simplify this phi |
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73 return phi; |
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74 } else if (phi.checkFlag(Value.Flag.PhiVisited)) { |
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75 // break cycles in phis |
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76 return phi; |
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77 } else if (phi.isIllegal()) { |
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78 // don't bother with illegals |
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79 return phi; |
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80 } else { |
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81 // attempt to simplify the phi by recursively simplifying its operands |
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82 phi.setFlag(Value.Flag.PhiVisited); |
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83 Value phiSubst = null; |
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84 int max = phi.phiInputCount(); |
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85 boolean cannotSimplify = false; |
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86 for (int i = 0; i < max; i++) { |
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87 Value oldInstr = phi.inputAt(i); |
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88 |
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89 if (oldInstr == null || oldInstr.isIllegal() || oldInstr.isDeadPhi()) { |
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90 // if one operand is illegal, make the entire phi illegal |
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91 phi.makeDead(); |
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92 phi.clearFlag(Value.Flag.PhiVisited); |
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93 return phi; |
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94 } |
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95 |
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96 Value newInstr = simplify(oldInstr); |
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97 |
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98 if (newInstr == null || newInstr.isIllegal() || newInstr.isDeadPhi()) { |
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99 // if the subst instruction is illegal, make the entire phi illegal |
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100 phi.makeDead(); |
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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 // attempt to simplify this operand |
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106 if (!cannotSimplify) { |
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107 |
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108 if (newInstr != phi && newInstr != phiSubst) { |
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109 if (phiSubst == null) { |
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110 phiSubst = newInstr; |
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111 continue; |
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112 } |
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113 // this phi cannot be simplified |
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114 cannotSimplify = true; |
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115 } |
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116 } |
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117 } |
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118 if (cannotSimplify) { |
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119 phi.setFlag(Value.Flag.PhiCannotSimplify); |
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120 phi.clearFlag(Value.Flag.PhiVisited); |
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121 return phi; |
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122 } |
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123 |
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124 // successfully simplified the phi |
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125 assert phiSubst != null : "illegal phi function"; |
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126 phi.clearFlag(Value.Flag.PhiVisited); |
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127 return phiSubst; |
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128 } |
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129 } |
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130 } |