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annotate graal/com.oracle.graal.loop/src/com/oracle/graal/loop/BasicInductionVariable.java @ 14978:e302df8bf51c

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separate subclasses for value and guard phis and proxies
author Lukas Stadler <lukas.stadler@oracle.com>
date Fri, 04 Apr 2014 18:32:32 +0200
parents 958c99d0790c
children 96bb07a5d667
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1 /*
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2 * Copyright (c) 2012, 2012, 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.oracle.graal.loop;
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24
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25 import com.oracle.graal.graph.*;
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26 import com.oracle.graal.nodes.*;
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27 import com.oracle.graal.nodes.calc.*;
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28 import com.oracle.graal.nodes.type.*;
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29
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30 public class BasicInductionVariable extends InductionVariable {
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31
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32 private ValuePhiNode phi;
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33 private ValueNode init;
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34 private ValueNode rawStride;
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35 private IntegerArithmeticNode op;
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36
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37 public BasicInductionVariable(LoopEx loop, ValuePhiNode phi, ValueNode init, ValueNode rawStride, IntegerArithmeticNode op) {
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38 super(loop);
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39 this.phi = phi;
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40 this.init = init;
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41 this.rawStride = rawStride;
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42 this.op = op;
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43 }
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44
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45 @Override
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46 public StructuredGraph graph() {
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47 return phi.graph();
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48 }
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49
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50 @Override
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51 public Direction direction() {
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52 Stamp stamp = rawStride.stamp();
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53 if (stamp instanceof IntegerStamp) {
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54 IntegerStamp integerStamp = (IntegerStamp) stamp;
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55 Direction dir = null;
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56 if (integerStamp.isStrictlyPositive()) {
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57 dir = Direction.Up;
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58 } else if (integerStamp.isStrictlyNegative()) {
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59 dir = Direction.Down;
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60 }
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61 if (dir != null) {
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62 if (op instanceof IntegerAddNode) {
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63 return dir;
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64 } else {
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65 assert op instanceof IntegerSubNode;
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66 return dir.opposite();
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67 }
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68 }
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69 }
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70 return null;
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71 }
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72
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73 @Override
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74 public ValuePhiNode valueNode() {
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75 return phi;
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76 }
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77
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78 @Override
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79 public ValueNode initNode() {
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80 return init;
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81 }
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82
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83 @Override
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84 public ValueNode strideNode() {
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85 if (op instanceof IntegerAddNode) {
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86 return rawStride;
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87 }
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88 if (op instanceof IntegerSubNode) {
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89 return graph().unique(new NegateNode(rawStride));
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90 }
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91 throw GraalInternalError.shouldNotReachHere();
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92 }
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93
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94 @Override
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95 public boolean isConstantInit() {
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96 return init.isConstant();
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97 }
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98
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99 @Override
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100 public boolean isConstantStride() {
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101 return rawStride.isConstant();
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102 }
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103
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104 @Override
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105 public long constantInit() {
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106 return init.asConstant().asLong();
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107 }
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108
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109 @Override
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110 public long constantStride() {
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111 if (op instanceof IntegerAddNode) {
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112 return rawStride.asConstant().asLong();
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113 }
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114 if (op instanceof IntegerSubNode) {
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115 return -rawStride.asConstant().asLong();
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116 }
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117 throw GraalInternalError.shouldNotReachHere();
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118 }
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119
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120 @Override
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121 public ValueNode extremumNode(boolean assumePositiveTripCount, Stamp stamp) {
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122 Stamp fromStamp = phi.stamp();
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123 StructuredGraph graph = graph();
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124 ValueNode stride = strideNode();
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125 ValueNode initNode = this.initNode();
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126 if (!fromStamp.isCompatible(stamp)) {
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127 stride = IntegerConvertNode.convert(stride, stamp);
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128 initNode = IntegerConvertNode.convert(initNode, stamp);
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129 }
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130 ValueNode maxTripCount = loop.counted().maxTripCountNode(assumePositiveTripCount);
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131 if (!maxTripCount.stamp().isCompatible(stamp)) {
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132 maxTripCount = IntegerConvertNode.convert(maxTripCount, stamp);
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133 }
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134 return IntegerArithmeticNode.add(graph, IntegerArithmeticNode.mul(graph, stride, IntegerArithmeticNode.sub(graph, maxTripCount, ConstantNode.forIntegerStamp(stamp, 1, graph))), initNode);
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135 }
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136
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137 @Override
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138 public ValueNode exitValueNode() {
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139 Stamp stamp = phi.stamp();
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140 ValueNode maxTripCount = loop.counted().maxTripCountNode(false);
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141 if (!maxTripCount.stamp().isCompatible(stamp)) {
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142 maxTripCount = IntegerConvertNode.convert(maxTripCount, stamp);
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143 }
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144 return IntegerArithmeticNode.add(graph(), IntegerArithmeticNode.mul(graph(), strideNode(), maxTripCount), initNode());
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145 }
acf09b065eba Calculate exit value of counted loop induction variables.
Roland Schatz <roland.schatz@oracle.com>
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146
acf09b065eba Calculate exit value of counted loop induction variables.
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147 @Override
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148 public boolean isConstantExtremum() {
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149 return isConstantInit() && isConstantStride() && loop.counted().isConstantMaxTripCount();
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150 }
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151
9f3250602d69 Preliminary counted loop detection
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152 @Override
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153 public long constantExtremum() {
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Gilles Duboscq <duboscq@ssw.jku.at>
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154 return constantStride() * (loop.counted().constantMaxTripCount() - 1) + constantInit();
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155 }
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156 }