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annotate graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/nodes/BitScanForwardNode.java @ 19403:7e2c87dae93e

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Create static final NodeClass field named TYPE in Node subclasses.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 16 Feb 2015 15:43:03 +0100
parents ec0733b5a90a
children 61d3cb8e1280
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1 /*
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2 * Copyright (c) 2012, 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.replacements.nodes;
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24
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25 import com.oracle.graal.api.code.*;
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26 import com.oracle.graal.api.meta.*;
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27 import com.oracle.graal.compiler.common.type.*;
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28 import com.oracle.graal.graph.*;
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29 import com.oracle.graal.graph.spi.*;
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30 import com.oracle.graal.nodeinfo.*;
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31 import com.oracle.graal.nodes.*;
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32 import com.oracle.graal.nodes.calc.*;
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33 import com.oracle.graal.nodes.spi.*;
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34
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35 /**
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36 * Determines the index of the least significant "1" bit. Note that the result is undefined if the
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37 * input is zero.
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38 */
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39 @NodeInfo
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40 public final class BitScanForwardNode extends UnaryNode implements LIRLowerable {
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41
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42 public static final NodeClass TYPE = NodeClass.get(BitScanForwardNode.class);
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43
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44 public BitScanForwardNode(ValueNode value) {
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45 super(TYPE, StampFactory.forInteger(Kind.Int, 0, ((PrimitiveStamp) value.stamp()).getBits()), value);
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46 assert value.getKind() == Kind.Int || value.getKind() == Kind.Long;
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47 }
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48
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49 @Override
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50 public boolean inferStamp() {
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51 IntegerStamp valueStamp = (IntegerStamp) getValue().stamp();
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52 int min;
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53 int max;
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54 long mask = CodeUtil.mask(valueStamp.getBits());
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55 int firstAlwaysSetBit = scan(valueStamp.downMask() & mask);
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56 int firstMaybeSetBit = scan(valueStamp.upMask() & mask);
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57 if (firstAlwaysSetBit == -1) {
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58 int lastMaybeSetBit = BitScanReverseNode.scan(valueStamp.upMask() & mask);
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59 min = firstMaybeSetBit;
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60 max = lastMaybeSetBit;
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61 } else {
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62 min = firstMaybeSetBit;
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63 max = firstAlwaysSetBit;
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64 }
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65 return updateStamp(StampFactory.forInteger(Kind.Int, min, max));
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66 }
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67
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68 @Override
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69 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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70 if (forValue.isConstant()) {
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71 JavaConstant c = forValue.asJavaConstant();
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72 if (c.asLong() != 0) {
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73 return ConstantNode.forInt(forValue.getKind() == Kind.Int ? scan(c.asInt()) : scan(c.asLong()));
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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 /**
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80 * Utility method with defined return value for 0.
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81 *
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82 * @param v
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83 * @return number of trailing zeros or -1 if {@code v} == 0.
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84 */
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85 public static int scan(long v) {
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86 if (v == 0) {
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87 return -1;
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88 }
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89 return Long.numberOfTrailingZeros(v);
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90 }
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91
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92 /**
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93 * Utility method with defined return value for 0.
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94 *
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95 * @param v
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96 * @return number of trailing zeros or -1 if {@code v} == 0.
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97 */
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98 public static int scan(int v) {
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99 return scan(0xffffffffL & v);
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100 }
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101
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102 /**
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103 * Raw intrinsic for bsf instruction.
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104 *
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105 * @param v
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106 * @return number of trailing zeros or an undefined value if {@code v} == 0.
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107 */
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108 @NodeIntrinsic
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109 public static native int unsafeScan(long v);
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110
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111 /**
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112 * Raw intrinsic for bsf instruction.
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113 *
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114 * @param v
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115 * @return number of trailing zeros or an undefined value if {@code v} == 0.
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116 */
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117 @NodeIntrinsic
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118 public static native int unsafeScan(int v);
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119
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120 @Override
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abebb5c2dc09 Use NodeLIRBuilderTool in LIRGenLowerable.
Josef Eisl <josef.eisl@jku.at>
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121 public void generate(NodeLIRBuilderTool gen) {
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0993768dfc8e new UnaryNode base class
Lukas Stadler <lukas.stadler@oracle.com>
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122 Value result = gen.getLIRGeneratorTool().emitBitScanForward(gen.operand(getValue()));
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Gilles Duboscq <duboscq@ssw.jku.at>
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123 gen.setResult(this, result);
f0d4304243ff Add intrinsics for (Long|Integer).(reverseBytes|numberOf(Trail|Lead)ingZeros)
Gilles Duboscq <duboscq@ssw.jku.at>
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124 }
f0d4304243ff Add intrinsics for (Long|Integer).(reverseBytes|numberOf(Trail|Lead)ingZeros)
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125 }