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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IntegerConvertNode.java @ 17276:ffb974bef674

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moved Node valueNumber and valueEquals logic (optionally) to generated nodes
author Doug Simon <doug.simon@oracle.com>
date Wed, 01 Oct 2014 07:39:47 +0200
parents 189479d72dc8
children 655f3e6b467b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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958c99d0790c Split convert node into separate nodes for different conversions.
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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.compiler.common.type.*;
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26 import com.oracle.graal.nodeinfo.*;
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27 import com.oracle.graal.nodes.*;
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28 import com.oracle.graal.nodes.spi.*;
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29
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30 /**
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31 * An {@code IntegerConvert} converts an integer to an integer of different width.
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32 */
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33 @NodeInfo
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34 public abstract class IntegerConvertNode extends ConvertNode implements ArithmeticLIRLowerable {
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35
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36 protected final int resultBits;
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37
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38 protected IntegerConvertNode(Stamp stamp, ValueNode input, int resultBits) {
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39 super(stamp, input);
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40 this.resultBits = resultBits;
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41 }
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42
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43 public int getResultBits() {
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44 return resultBits;
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45 }
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46
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47 public int getInputBits() {
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48 if (getValue().stamp() instanceof IntegerStamp) {
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49 return ((IntegerStamp) getValue().stamp()).getBits();
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50 } else {
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51 return 0;
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52 }
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53 }
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54
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55 protected ValueNode canonicalConvert(@SuppressWarnings("hiding") ValueNode value) {
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56 if (value.stamp() instanceof IntegerStamp) {
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57 int inputBits = ((IntegerStamp) value.stamp()).getBits();
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58 if (inputBits == resultBits) {
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59 return value;
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60 } else if (value.isConstant()) {
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61 return ConstantNode.forIntegerBits(resultBits, evalConst(value.asConstant()).asLong());
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62 }
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63 }
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64 return this;
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65 }
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66
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67 public static ValueNode convert(ValueNode input, Stamp stamp) {
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68 return convert(input, stamp, false);
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69 }
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70
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71 public static ValueNode convert(ValueNode input, Stamp stamp, StructuredGraph graph) {
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72 ValueNode convert = convert(input, stamp, false);
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73 if (!convert.isAlive()) {
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74 assert !convert.isDeleted();
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75 convert = graph.addOrUnique(convert);
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76 }
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77 return convert;
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78 }
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79
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80 public static ValueNode convertUnsigned(ValueNode input, Stamp stamp) {
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81 return convert(input, stamp, true);
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82 }
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83
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84 public static ValueNode convert(ValueNode input, Stamp stamp, boolean zeroExtend) {
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85 IntegerStamp fromStamp = (IntegerStamp) input.stamp();
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86 IntegerStamp toStamp = (IntegerStamp) stamp;
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87
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88 ValueNode result;
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89 if (toStamp.getBits() == fromStamp.getBits()) {
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90 result = input;
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91 } else if (toStamp.getBits() < fromStamp.getBits()) {
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92 result = NarrowNode.create(input, toStamp.getBits());
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93 } else if (zeroExtend) {
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94 // toStamp.getBits() > fromStamp.getBits()
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95 result = ZeroExtendNode.create(input, toStamp.getBits());
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96 } else {
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97 // toStamp.getBits() > fromStamp.getBits()
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98 result = SignExtendNode.create(input, toStamp.getBits());
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99 }
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100
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101 IntegerStamp resultStamp = (IntegerStamp) result.stamp();
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102 assert toStamp.getBits() == resultStamp.getBits();
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103 return result;
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104 }
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105 }