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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/RightShiftNode.java @ 16895:06c15e88d383

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added factory method to all Node classes; replaced Node classes instantiation with calls to factory methods; replaced identity tests on Node classes with ' == <node class>.getGenClass()' idiom
author Doug Simon <doug.simon@oracle.com>
date Mon, 18 Aug 2014 14:04:21 +0200
parents cbd42807a31f
children 0fe4732e5181
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1 /*
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2 * Copyright (c) 2011, 2014, 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.nodes.calc;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.compiler.common.type.*;
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27 import com.oracle.graal.graph.spi.*;
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28 import com.oracle.graal.lir.gen.*;
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29 import com.oracle.graal.nodeinfo.*;
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30 import com.oracle.graal.nodes.*;
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31 import com.oracle.graal.nodes.spi.*;
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32 import com.oracle.graal.nodes.type.*;
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34 @NodeInfo(shortName = ">>")
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35 public class RightShiftNode extends ShiftNode {
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36
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37 public static RightShiftNode create(ValueNode x, ValueNode y) {
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38 return new RightShiftNodeGen(x, y);
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39 }
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40
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41 protected RightShiftNode(ValueNode x, ValueNode y) {
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42 super(x, y);
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43 }
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44
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45 @Override
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46 public boolean inferStamp() {
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47 return updateStamp(StampTool.rightShift(getX().stamp(), getY().stamp()));
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48 }
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49
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50 @Override
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51 public Constant evalConst(Constant... inputs) {
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52 assert inputs.length == 2;
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53 if (getKind() == Kind.Int) {
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54 return Constant.forInt(inputs[0].asInt() >> inputs[1].asInt());
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55 } else {
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56 assert getKind() == Kind.Long;
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57 return Constant.forLong(inputs[0].asLong() >> inputs[1].asLong());
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58 }
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59 }
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60
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61 @Override
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62 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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63 if (forX.stamp() instanceof IntegerStamp && ((IntegerStamp) forX.stamp()).isPositive()) {
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64 return UnsignedRightShiftNode.create(forX, forY);
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65 }
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66 if (forX.isConstant() && forY.isConstant()) {
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67 return ConstantNode.forPrimitive(evalConst(forX.asConstant(), forY.asConstant()));
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68 } else if (forY.isConstant()) {
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69 int amount = forY.asConstant().asInt();
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70 int originalAmout = amount;
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71 int mask = getShiftAmountMask();
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72 amount &= mask;
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73 if (amount == 0) {
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74 return forX;
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75 }
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76 if (forX instanceof ShiftNode) {
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77 ShiftNode other = (ShiftNode) forX;
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78 if (other.getY().isConstant()) {
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79 int otherAmount = other.getY().asConstant().asInt() & mask;
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80 if (other instanceof RightShiftNode) {
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81 int total = amount + otherAmount;
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82 if (total != (total & mask)) {
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83 assert other.getX().stamp() instanceof IntegerStamp;
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84 IntegerStamp istamp = (IntegerStamp) other.getX().stamp();
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85
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86 if (istamp.isPositive()) {
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87 return ConstantNode.forIntegerKind(getKind(), 0);
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88 }
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89 if (istamp.isStrictlyNegative()) {
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90 return ConstantNode.forIntegerKind(getKind(), -1L);
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91 }
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92
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93 /*
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94 * if we cannot replace both shifts with a constant, replace them by a
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95 * full shift for this kind
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96 */
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97 assert total >= mask;
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98 return RightShiftNode.create(other.getX(), ConstantNode.forInt(mask));
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99 }
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100 return RightShiftNode.create(other.getX(), ConstantNode.forInt(total));
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101 }
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102 }
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103 }
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104 if (originalAmout != amount) {
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105 return RightShiftNode.create(forX, ConstantNode.forInt(amount));
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106 }
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107 }
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108 return this;
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109 }
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110
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111 @Override
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112 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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113 builder.setResult(this, gen.emitShr(builder.operand(getX()), builder.operand(getY())));
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114 }
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115 }