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annotate graal/GraalCompiler/src/com/sun/c1x/gen/PhiSimplifier.java @ 2808:189ffb7d1d84

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enable PhiSimplifier, schedule values used in a merge's stateBefore in the dominator
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 30 May 2011 13:42:23 +0200
parents 6d14aa4fbf90
children 015be60afcf3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 && !phi.checkFlag(Value.Flag.PhiCannotSimplify)) {
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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
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109 phi.replace(phiSubst);
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110 // System.out.printf("replaced phi with %d inputs\n", max);
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111
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112 return phiSubst;
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113 }
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114 }
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115 }