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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NarrowNode.java @ 19403:61d3cb8e1280

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Add generic parameter to NodeClass. Change Graph#getNodes(Class) to Graph#getNodes(NodeClass).
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 16 Feb 2015 17:47:43 +0100
parents 7e2c87dae93e
children 8fc336a04d77
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1 /*
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2 * Copyright (c) 2014, 2015, 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.compiler.common.type.*;
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26 import com.oracle.graal.compiler.common.type.ArithmeticOpTable.*;
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27 import com.oracle.graal.compiler.common.type.ArithmeticOpTable.IntegerConvertOp.Narrow;
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28 import com.oracle.graal.compiler.common.type.ArithmeticOpTable.IntegerConvertOp.SignExtend;
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29 import com.oracle.graal.graph.*;
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30 import com.oracle.graal.graph.spi.*;
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31 import com.oracle.graal.lir.gen.*;
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32 import com.oracle.graal.nodeinfo.*;
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33 import com.oracle.graal.nodes.*;
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34 import com.oracle.graal.nodes.spi.*;
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35
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36 /**
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37 * The {@code NarrowNode} converts an integer to a narrower integer.
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38 */
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39 @NodeInfo
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40 public final class NarrowNode extends IntegerConvertNode<Narrow, SignExtend> {
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41
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42 public static final NodeClass<NarrowNode> TYPE = NodeClass.get(NarrowNode.class);
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43
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44 public NarrowNode(ValueNode input, int resultBits) {
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45 this(input, PrimitiveStamp.getBits(input.stamp()), resultBits);
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46 assert 0 < resultBits && resultBits <= PrimitiveStamp.getBits(input.stamp());
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47 }
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48
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49 public NarrowNode(ValueNode input, int inputBits, int resultBits) {
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50 super(TYPE, ArithmeticOpTable::getNarrow, ArithmeticOpTable::getSignExtend, inputBits, resultBits, input);
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51 }
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52
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53 public static ValueNode create(ValueNode input, int resultBits) {
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54 return create(input, PrimitiveStamp.getBits(input.stamp()), resultBits);
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55 }
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56
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57 public static ValueNode create(ValueNode input, int inputBits, int resultBits) {
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58 IntegerConvertOp<Narrow> signExtend = ArithmeticOpTable.forStamp(input.stamp()).getNarrow();
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59 ValueNode synonym = findSynonym(signExtend, input, inputBits, resultBits, signExtend.foldStamp(inputBits, resultBits, input.stamp()));
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60 if (synonym != null) {
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61 return synonym;
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62 } else {
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63 return new NarrowNode(input, inputBits, resultBits);
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64 }
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65 }
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66
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67 @Override
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68 public boolean isLossless() {
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69 return false;
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70 }
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71
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72 @Override
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73 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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74 ValueNode ret = super.canonical(tool, forValue);
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75 if (ret != this) {
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76 return ret;
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77 }
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78
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79 if (forValue instanceof NarrowNode) {
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80 // zzzzzzzz yyyyxxxx -(narrow)-> yyyyxxxx -(narrow)-> xxxx
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81 // ==> zzzzzzzz yyyyxxxx -(narrow)-> xxxx
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82 NarrowNode other = (NarrowNode) forValue;
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83 return new NarrowNode(other.getValue(), other.getInputBits(), getResultBits());
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84 } else if (forValue instanceof IntegerConvertNode) {
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85 // SignExtendNode or ZeroExtendNode
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86 IntegerConvertNode<?, ?> other = (IntegerConvertNode<?, ?>) forValue;
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87 if (getResultBits() == other.getInputBits()) {
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88 // xxxx -(extend)-> yyyy xxxx -(narrow)-> xxxx
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89 // ==> no-op
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90 return other.getValue();
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91 } else if (getResultBits() < other.getInputBits()) {
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92 // yyyyxxxx -(extend)-> zzzzzzzz yyyyxxxx -(narrow)-> xxxx
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93 // ==> yyyyxxxx -(narrow)-> xxxx
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94 return new NarrowNode(other.getValue(), other.getInputBits(), getResultBits());
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95 } else {
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96 if (other instanceof SignExtendNode) {
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97 // sxxx -(sign-extend)-> ssssssss sssssxxx -(narrow)-> sssssxxx
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98 // ==> sxxx -(sign-extend)-> sssssxxx
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99 return new SignExtendNode(other.getValue(), other.getInputBits(), getResultBits());
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100 } else if (other instanceof ZeroExtendNode) {
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101 // xxxx -(zero-extend)-> 00000000 00000xxx -(narrow)-> 0000xxxx
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102 // ==> xxxx -(zero-extend)-> 0000xxxx
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103 return new ZeroExtendNode(other.getValue(), other.getInputBits(), getResultBits());
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104 }
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105 }
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106 }
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107 return this;
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108 }
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109
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110 @Override
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111 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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112 builder.setResult(this, gen.emitNarrow(builder.operand(getValue()), getResultBits()));
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113 }
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114 }