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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NarrowNode.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) 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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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 static NarrowNode create(ValueNode input, int resultBits) {
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41 return new NarrowNodeGen(input, resultBits);
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42 }
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43
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44 protected NarrowNode(ValueNode input, int resultBits) {
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45 super(StampTool.narrowingConversion(input.stamp(), resultBits), input, resultBits);
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46 }
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47
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48 public static long narrow(long value, int resultBits) {
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49 long ret = value & IntegerStamp.defaultMask(resultBits);
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50 return SignExtendNode.signExtend(ret, resultBits);
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51 }
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52
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53 @Override
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54 public Constant convert(Constant c) {
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55 return Constant.forPrimitiveInt(getResultBits(), narrow(c.asLong(), getResultBits()));
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56 }
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57
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58 @Override
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59 public Constant reverse(Constant input) {
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60 long result = SignExtendNode.signExtend(input.asLong(), getResultBits());
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61 return Constant.forPrimitiveInt(getInputBits(), result);
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62 }
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63
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64 @Override
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65 public boolean isLossless() {
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66 return false;
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67 }
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68
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69 @Override
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70 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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71 ValueNode ret = canonicalConvert(forValue);
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72 if (ret != this) {
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73 return ret;
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74 }
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75
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76 if (forValue instanceof NarrowNode) {
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77 // zzzzzzzz yyyyxxxx -(narrow)-> yyyyxxxx -(narrow)-> xxxx
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78 // ==> zzzzzzzz yyyyxxxx -(narrow)-> xxxx
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79 NarrowNode other = (NarrowNode) forValue;
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80 return NarrowNode.create(other.getValue(), getResultBits());
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81 } else if (forValue instanceof IntegerConvertNode) {
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82 // SignExtendNode or ZeroExtendNode
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83 IntegerConvertNode other = (IntegerConvertNode) forValue;
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84 if (getResultBits() == other.getInputBits()) {
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85 // xxxx -(extend)-> yyyy xxxx -(narrow)-> xxxx
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86 // ==> no-op
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87 return other.getValue();
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88 } else if (getResultBits() < other.getInputBits()) {
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89 // yyyyxxxx -(extend)-> zzzzzzzz yyyyxxxx -(narrow)-> xxxx
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90 // ==> yyyyxxxx -(narrow)-> xxxx
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91 return NarrowNode.create(other.getValue(), getResultBits());
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92 } else {
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93 if (other instanceof SignExtendNode) {
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94 // sxxx -(sign-extend)-> ssssssss sssssxxx -(narrow)-> sssssxxx
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95 // ==> sxxx -(sign-extend)-> sssssxxx
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96 return SignExtendNode.create(other.getValue(), getResultBits());
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97 } else if (other instanceof ZeroExtendNode) {
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98 // xxxx -(zero-extend)-> 00000000 00000xxx -(narrow)-> 0000xxxx
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99 // ==> xxxx -(zero-extend)-> 0000xxxx
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100 return ZeroExtendNode.create(other.getValue(), getResultBits());
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101 }
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102 }
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103 }
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104 return this;
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105 }
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106
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107 @Override
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108 public boolean inferStamp() {
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109 return updateStamp(StampTool.narrowingConversion(getValue().stamp(), getResultBits()));
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110 }
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111
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112 @Override
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113 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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114 builder.setResult(this, gen.emitNarrow(builder.operand(getValue()), getResultBits()));
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115 }
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116 }