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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NarrowNode.java @ 16811:5d468add216f

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added @NodeInfo annotations to all Node classes
author Doug Simon <doug.simon@oracle.com>
date Wed, 13 Aug 2014 18:25:45 +0200
parents 388b787a5fe6
children cbd42807a31f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 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.*;
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28 import com.oracle.graal.graph.spi.*;
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29 import com.oracle.graal.lir.gen.*;
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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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33
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34 /**
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35 * The {@code NarrowNode} converts an integer to a narrower integer.
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36 */
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37 @NodeInfo
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38 public class NarrowNode extends IntegerConvertNode {
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39
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40 public NarrowNode(ValueNode input, int resultBits) {
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41 super(StampTool.narrowingConversion(input.stamp(), resultBits), input, resultBits);
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42 }
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43
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44 public static long narrow(long value, int resultBits) {
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45 long ret = value & IntegerStamp.defaultMask(resultBits);
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46 return SignExtendNode.signExtend(ret, resultBits);
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47 }
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48
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49 @Override
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50 public Constant convert(Constant c) {
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51 return Constant.forPrimitiveInt(getResultBits(), narrow(c.asLong(), getResultBits()));
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52 }
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53
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54 @Override
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55 public Constant reverse(Constant input) {
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56 long result = SignExtendNode.signExtend(input.asLong(), getResultBits());
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57 return Constant.forPrimitiveInt(getInputBits(), result);
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58 }
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59
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60 @Override
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61 public boolean isLossless() {
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62 return false;
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63 }
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64
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65 @Override
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66 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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67 ValueNode ret = canonicalConvert(forValue);
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68 if (ret != this) {
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69 return ret;
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70 }
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71
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72 if (forValue instanceof NarrowNode) {
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73 // zzzzzzzz yyyyxxxx -(narrow)-> yyyyxxxx -(narrow)-> xxxx
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74 // ==> zzzzzzzz yyyyxxxx -(narrow)-> xxxx
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75 NarrowNode other = (NarrowNode) forValue;
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76 return new NarrowNode(other.getValue(), getResultBits());
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77 } else if (forValue instanceof IntegerConvertNode) {
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78 // SignExtendNode or ZeroExtendNode
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79 IntegerConvertNode other = (IntegerConvertNode) forValue;
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80 if (getResultBits() == other.getInputBits()) {
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81 // xxxx -(extend)-> yyyy xxxx -(narrow)-> xxxx
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82 // ==> no-op
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83 return other.getValue();
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84 } else if (getResultBits() < other.getInputBits()) {
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85 // yyyyxxxx -(extend)-> zzzzzzzz yyyyxxxx -(narrow)-> xxxx
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86 // ==> yyyyxxxx -(narrow)-> xxxx
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87 return new NarrowNode(other.getValue(), getResultBits());
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88 } else {
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89 if (other instanceof SignExtendNode) {
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90 // sxxx -(sign-extend)-> ssssssss sssssxxx -(narrow)-> sssssxxx
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91 // ==> sxxx -(sign-extend)-> sssssxxx
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92 return new SignExtendNode(other.getValue(), getResultBits());
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93 } else if (other instanceof ZeroExtendNode) {
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94 // xxxx -(zero-extend)-> 00000000 00000xxx -(narrow)-> 0000xxxx
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95 // ==> xxxx -(zero-extend)-> 0000xxxx
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96 return new ZeroExtendNode(other.getValue(), getResultBits());
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97 }
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98 }
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99 }
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100 return this;
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101 }
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102
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103 @Override
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104 public boolean inferStamp() {
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105 return updateStamp(StampTool.narrowingConversion(getValue().stamp(), getResultBits()));
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106 }
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107
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108 @Override
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109 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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110 builder.setResult(this, gen.emitNarrow(builder.operand(getValue()), getResultBits()));
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111 }
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112 }