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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IntegerConvertNode.java @ 14000:958c99d0790c

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Split convert node into separate nodes for different conversions.
author Roland Schatz <roland.schatz@oracle.com>
date Fri, 21 Feb 2014 11:53:48 +0100
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children 9738280055ce
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14000
958c99d0790c Split convert node into separate nodes for different conversions.
Roland Schatz <roland.schatz@oracle.com>
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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 *
958c99d0790c Split convert node into separate nodes for different conversions.
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5 * This code is free software; you can redistribute it and/or modify it
958c99d0790c Split convert node into separate nodes for different conversions.
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6 * under the terms of the GNU General Public License version 2 only, as
958c99d0790c Split convert node into separate nodes for different conversions.
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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
958c99d0790c Split convert node into separate nodes for different conversions.
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
958c99d0790c Split convert node into separate nodes for different conversions.
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
958c99d0790c Split convert node into separate nodes for different conversions.
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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 *
958c99d0790c Split convert node into separate nodes for different conversions.
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15 * You should have received a copy of the GNU General Public License version
958c99d0790c Split convert node into separate nodes for different conversions.
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16 * 2 along with this work; if not, write to the Free Software Foundation,
958c99d0790c Split convert node into separate nodes for different conversions.
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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
958c99d0790c Split convert node into separate nodes for different conversions.
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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.nodes.*;
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29 import com.oracle.graal.nodes.spi.*;
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30 import com.oracle.graal.nodes.type.*;
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31
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32 /**
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33 * An {@code IntegerConvert} converts an integer to an integer of different width.
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34 */
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35 public abstract class IntegerConvertNode extends ConvertNode implements Canonicalizable, ArithmeticLIRLowerable {
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36
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37 private final int resultBits;
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38
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39 protected IntegerConvertNode(Stamp stamp, ValueNode input, int resultBits) {
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40 super(stamp, input);
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41 this.resultBits = resultBits;
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42 }
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43
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44 public int getResultBits() {
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45 return resultBits;
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46 }
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47
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48 public int getInputBits() {
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49 if (getInput().stamp() instanceof IntegerStamp) {
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50 return ((IntegerStamp) getInput().stamp()).getBits();
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51 } else {
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52 return 0;
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53 }
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54 }
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55
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56 public static long convert(long value, int bits, boolean unsigned) {
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57 if (unsigned) {
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58 return ZeroExtendNode.zeroExtend(value, bits);
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59 } else {
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60 return SignExtendNode.signExtend(value, bits);
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61 }
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62 }
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63
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64 @Override
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65 public Node canonical(CanonicalizerTool tool) {
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66 if (getInput().stamp() instanceof IntegerStamp) {
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67 int inputBits = ((IntegerStamp) getInput().stamp()).getBits();
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68 if (inputBits == resultBits) {
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69 return getInput();
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70 } else if (getInput().isConstant()) {
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71 Constant ret = evalConst(getInput().asConstant());
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72 return ConstantNode.forIntegerBits(resultBits, false, ret.asLong(), graph());
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73 }
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74 }
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75
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76 return this;
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77 }
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78
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79 public static ValueNode convert(ValueNode input, Stamp stamp) {
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80 StructuredGraph graph = input.graph();
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81 IntegerStamp fromStamp = (IntegerStamp) input.stamp();
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82 IntegerStamp toStamp = (IntegerStamp) stamp;
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83
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84 ValueNode result;
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85 if (toStamp.getBits() == fromStamp.getBits()) {
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86 result = input;
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87 } else if (toStamp.getBits() < fromStamp.getBits()) {
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88 result = graph.unique(new NarrowNode(input, toStamp.getBits()));
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89 } else {
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90 // toStamp.getBits() > fromStamp.getBits()
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91 if (fromStamp.isUnsigned()) {
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92 result = graph.unique(new ZeroExtendNode(input, toStamp.getBits()));
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93 } else {
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94 result = graph.unique(new SignExtendNode(input, toStamp.getBits()));
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95 }
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96 }
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97
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98 IntegerStamp resultStamp = (IntegerStamp) result.stamp();
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99 assert toStamp.getBits() == resultStamp.getBits();
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100 if (toStamp.isUnsigned() == resultStamp.isUnsigned()) {
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101 return result;
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102 } else {
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103 return graph.unique(new ReinterpretNode(toStamp, result));
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104 }
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105 }
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106 }