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annotate graal/com.oracle.graal.replacements.amd64/src/com/oracle/graal/replacements/amd64/AMD64CountLeadingZerosNode.java @ 18845:f57d86eb036f

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removed Node factory methods
author Doug Simon <doug.simon@oracle.com>
date Mon, 12 Jan 2015 20:39:04 +0100
parents 0ce6ee3d7a98
children ec0733b5a90a
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1 /*
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2 * Copyright (c) 2012, 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.replacements.amd64;
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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.spi.*;
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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.calc.*;
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32 import com.oracle.graal.nodes.spi.*;
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33
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34 /**
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35 * Count the number of leading zeros.
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36 */
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37 @NodeInfo
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38 public class AMD64CountLeadingZerosNode extends UnaryNode implements LIRLowerable {
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39
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40 public AMD64CountLeadingZerosNode(ValueNode value) {
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41 super(StampFactory.forInteger(Kind.Int, 0, ((PrimitiveStamp) value.stamp()).getBits()), value);
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42 assert value.getKind() == Kind.Int || value.getKind() == Kind.Long;
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43 }
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44
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45 @Override
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46 public boolean inferStamp() {
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47 assert value.getKind() == Kind.Int || value.getKind() == Kind.Long;
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48 IntegerStamp valueStamp = (IntegerStamp) getValue().stamp();
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49 long mask = CodeUtil.mask(valueStamp.getBits());
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50 // Don't count zeros from the mask in the result.
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51 int adjust = Long.numberOfLeadingZeros(mask);
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52 assert adjust == 0 || adjust == 32;
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53 int min = Long.numberOfLeadingZeros(valueStamp.upMask() & mask) - adjust;
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54 int max = Long.numberOfLeadingZeros(valueStamp.downMask() & mask) - adjust;
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55 return updateStamp(StampFactory.forInteger(Kind.Int, min, max));
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56 }
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57
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58 @Override
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59 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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60 if (forValue.isConstant()) {
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61 JavaConstant c = forValue.asJavaConstant();
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62 if (forValue.getKind() == Kind.Int) {
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63 return ConstantNode.forInt(Integer.numberOfLeadingZeros(c.asInt()));
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64 } else {
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65 return ConstantNode.forInt(Long.numberOfLeadingZeros(c.asLong()));
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66 }
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67 }
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68 return this;
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69 }
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70
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71 /**
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72 * Raw intrinsic for lzcntq instruction.
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73 *
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74 * @param v
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75 * @return number of trailing zeros
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76 */
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77 @NodeIntrinsic
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78 public static native int count(long v);
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79
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80 /**
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81 * Raw intrinsic for lzcntl instruction.
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82 *
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83 * @param v
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84 * @return number of trailing zeros
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85 */
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86 @NodeIntrinsic
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87 public static native int count(int v);
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88
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89 @Override
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90 public void generate(NodeLIRBuilderTool gen) {
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91 Value result = gen.getLIRGeneratorTool().emitCountLeadingZeros(gen.operand(getValue()));
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92 gen.setResult(this, result);
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93 }
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94 }