Mercurial > hg > truffle
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/UnsignedRightShiftNode.java @ 16822:5d468add216f
added @NodeInfo annotations to all Node classes
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 13 Aug 2014 18:25:45 +0200 |
parents | 561070049e73 |
children | cbd42807a31f |
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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.graph.*; |
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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.nodes.*; |
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30 import com.oracle.graal.nodes.spi.*; |
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31 import com.oracle.graal.nodes.type.*; |
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32 |
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33 @NodeInfo(shortName = ">>>") |
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34 public class UnsignedRightShiftNode extends ShiftNode { |
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35 |
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36 public UnsignedRightShiftNode(ValueNode x, ValueNode y) { |
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37 super(x, y); |
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38 } |
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39 |
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40 @Override |
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41 public boolean inferStamp() { |
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42 return updateStamp(StampTool.unsignedRightShift(getX().stamp(), getY().stamp())); |
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43 } |
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44 |
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45 @Override |
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46 public Constant evalConst(Constant... inputs) { |
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47 assert inputs.length == 2; |
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48 if (getKind() == Kind.Int) { |
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49 return Constant.forInt(inputs[0].asInt() >>> inputs[1].asInt()); |
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50 } else { |
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51 assert getKind() == Kind.Long; |
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52 return Constant.forLong(inputs[0].asLong() >>> inputs[1].asLong()); |
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53 } |
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54 } |
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55 |
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56 @Override |
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57 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) { |
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58 if (forX.isConstant() && forY.isConstant()) { |
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59 return ConstantNode.forPrimitive(evalConst(forX.asConstant(), forY.asConstant())); |
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60 } else if (forY.isConstant()) { |
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61 int amount = forY.asConstant().asInt(); |
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62 int originalAmout = amount; |
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63 int mask = getShiftAmountMask(); |
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64 amount &= mask; |
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65 if (amount == 0) { |
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66 return forX; |
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67 } |
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68 if (forX instanceof ShiftNode) { |
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69 ShiftNode other = (ShiftNode) forX; |
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70 if (other.getY().isConstant()) { |
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71 int otherAmount = other.getY().asConstant().asInt() & mask; |
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72 if (other instanceof UnsignedRightShiftNode) { |
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73 int total = amount + otherAmount; |
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74 if (total != (total & mask)) { |
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75 return ConstantNode.forIntegerKind(getKind(), 0); |
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76 } |
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77 return new UnsignedRightShiftNode(other.getX(), ConstantNode.forInt(total)); |
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78 } else if (other instanceof LeftShiftNode && otherAmount == amount) { |
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79 if (getKind() == Kind.Long) { |
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80 return new AndNode(other.getX(), ConstantNode.forLong(-1L >>> amount)); |
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81 } else { |
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82 assert getKind() == Kind.Int; |
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83 return new AndNode(other.getX(), ConstantNode.forInt(-1 >>> amount)); |
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84 } |
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85 } |
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86 } |
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87 } |
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88 if (originalAmout != amount) { |
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89 return new UnsignedRightShiftNode(forX, ConstantNode.forInt(amount)); |
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90 } |
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91 } |
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92 return this; |
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93 } |
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94 |
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95 @Override |
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96 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) { |
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97 builder.setResult(this, gen.emitUShr(builder.operand(getX()), builder.operand(getY()))); |
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98 } |
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99 } |