Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/opt/PhiSimplifier.java @ 2653:7c8ad40c1f88
No need for stateAfter on volatile field loads.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 15:11:33 +0200 |
parents | 768d77a1c7af |
children | 785e9ecdcc69 |
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.opt; |
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24 |
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25 import com.sun.c1x.graph.IR; |
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26 import com.sun.c1x.ir.*; |
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27 import com.sun.c1x.value.*; |
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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 * @author Ben L. Titzer |
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33 */ |
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34 public final class PhiSimplifier implements BlockClosure { |
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35 |
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36 final IR ir; |
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37 final InstructionSubstituter subst; |
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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 this.subst = new InstructionSubstituter(ir); |
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42 ir.startBlock.iterateAnyOrder(this, false); |
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43 subst.finish(); |
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44 } |
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45 |
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46 /** |
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47 * This method is called for each block and processes any phi statements in the block. |
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48 * @param block the block to apply the simplification to |
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49 */ |
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50 public void apply(BlockBegin block) { |
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51 FrameState state = block.stateBefore(); |
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52 for (int i = 0; i < state.stackSize(); i++) { |
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53 simplify(state.stackAt(i)); |
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54 } |
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55 for (int i = 0; i < state.localsSize(); i++) { |
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56 simplify(state.localAt(i)); |
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57 } |
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58 } |
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59 |
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60 Value simplify(Value x) { |
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61 if (x == null || !(x instanceof Phi)) { |
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62 return x; |
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63 } |
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64 Phi phi = (Phi) x; |
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65 if (phi.hasSubst()) { |
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66 // already substituted, but the subst could be a phi itself, so simplify |
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67 return simplify(subst.getSubst(phi)); |
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68 } else if (phi.checkFlag(Value.Flag.PhiCannotSimplify)) { |
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69 // already tried, cannot simplify this phi |
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70 return phi; |
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71 } else if (phi.checkFlag(Value.Flag.PhiVisited)) { |
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72 // break cycles in phis |
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73 return phi; |
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74 } else if (phi.isIllegal()) { |
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75 // don't bother with illegals |
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76 return phi; |
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77 } else { |
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78 // attempt to simplify the phi by recursively simplifying its operands |
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79 phi.setFlag(Value.Flag.PhiVisited); |
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80 Value phiSubst = null; |
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81 int max = phi.phiInputCount(); |
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82 boolean cannotSimplify = false; |
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83 for (int i = 0; i < max; i++) { |
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84 Value oldInstr = phi.inputAt(i); |
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85 |
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86 if (oldInstr == null || oldInstr.isIllegal() || oldInstr.isDeadPhi()) { |
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87 // if one operand is illegal, make the entire phi illegal |
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88 phi.makeDead(); |
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89 phi.clearFlag(Value.Flag.PhiVisited); |
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90 return phi; |
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91 } |
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92 |
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93 Value newInstr = simplify(oldInstr); |
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94 |
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95 if (newInstr == null || newInstr.isIllegal() || newInstr.isDeadPhi()) { |
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96 // if the subst instruction is illegal, make the entire phi illegal |
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97 phi.makeDead(); |
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98 phi.clearFlag(Value.Flag.PhiVisited); |
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99 return phi; |
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100 } |
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101 |
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102 // attempt to simplify this operand |
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103 if (!cannotSimplify) { |
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104 |
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105 if (newInstr != phi && newInstr != phiSubst) { |
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106 if (phiSubst == null) { |
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107 phiSubst = newInstr; |
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108 continue; |
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109 } |
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110 // this phi cannot be simplified |
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111 cannotSimplify = true; |
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112 } |
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113 } |
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114 } |
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115 if (cannotSimplify) { |
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116 phi.setFlag(Value.Flag.PhiCannotSimplify); |
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117 phi.clearFlag(Value.Flag.PhiVisited); |
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118 return phi; |
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119 } |
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120 |
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121 // successfully simplified the phi |
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122 assert phiSubst != null : "illegal phi function"; |
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123 phi.clearFlag(Value.Flag.PhiVisited); |
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124 subst.setSubst(phi, phiSubst); |
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125 return phiSubst; |
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126 } |
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127 } |
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128 } |