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annotate graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/nodes/BitScanForwardNode.java @ 16592:8084d44c78d3

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don't allow bsr to be used outside of intrinsics
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Thu, 24 Jul 2014 12:22:54 -0700
parents 388b787a5fe6
children 5d468add216f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.nodes;
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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.compiler.common.type.*;
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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.calc.*;
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30 import com.oracle.graal.nodes.spi.*;
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31
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32 /**
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33 * Determines the index of the least significant "1" bit. Note that the result is undefined if the
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34 * input is zero.
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35 */
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36 public class BitScanForwardNode extends UnaryNode implements LIRLowerable {
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37
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38 public BitScanForwardNode(ValueNode value) {
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39 super(StampFactory.forInteger(Kind.Int, 0, ((PrimitiveStamp) value.stamp()).getBits()), value);
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40 assert value.getKind() == Kind.Int || value.getKind() == Kind.Long;
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41 }
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42
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43 @Override
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44 public boolean inferStamp() {
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45 IntegerStamp valueStamp = (IntegerStamp) getValue().stamp();
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46 int min;
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47 int max;
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48 long mask = IntegerStamp.defaultMask(valueStamp.getBits());
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49 int firstAlwaysSetBit = scan(valueStamp.downMask() & mask);
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50 if (firstAlwaysSetBit == -1) {
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51 int lastMaybeSetBit = BitScanReverseNode.scan(valueStamp.upMask() & mask);
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52 min = -1;
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53 max = lastMaybeSetBit;
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54 } else {
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55 int firstMaybeSetBit = scan(valueStamp.upMask() & mask);
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56 min = firstMaybeSetBit;
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57 max = firstAlwaysSetBit;
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58 }
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59 return updateStamp(StampFactory.forInteger(Kind.Int, min, max));
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60 }
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61
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62 @Override
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63 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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64 if (forValue.isConstant()) {
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65 Constant c = forValue.asConstant();
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66 if (c.asLong() != 0) {
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67 return ConstantNode.forInt(forValue.getKind() == Kind.Int ? scan(c.asInt()) : scan(c.asLong()));
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68 }
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69 }
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70 return this;
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71 }
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72
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73 /**
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74 * Utility method with defined return value for 0.
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75 *
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76 * @param v
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77 * @return number of trailing zeros or -1 if {@code v} == 0.
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78 */
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79 public static int scan(long v) {
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80 if (v == 0) {
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81 return -1;
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82 }
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83 return Long.numberOfTrailingZeros(v);
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84 }
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85
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86 /**
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87 * Utility method with defined return value for 0.
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88 *
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89 * @param v
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90 * @return number of trailing zeros or -1 if {@code v} == 0.
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91 */
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92 public static int scan(int v) {
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93 return scan(0xffffffffL & v);
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94 }
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95
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96 /**
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97 * Raw intrinsic for bsf instruction.
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98 *
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99 * @param v
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100 * @return number of trailing zeros or an undefined value if {@code v} == 0.
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101 */
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102 @NodeIntrinsic
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103 public static native int unsafeScan(long v);
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104
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105 /**
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106 * Raw intrinsic for bsf instruction.
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107 *
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108 * @param v
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109 * @return number of trailing zeros or an undefined value if {@code v} == 0.
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110 */
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111 @NodeIntrinsic
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112 public static native int unsafeScan(int v);
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113
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114 @Override
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115 public void generate(NodeLIRBuilderTool gen) {
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116 Value result = gen.getLIRGeneratorTool().emitBitScanForward(gen.operand(getValue()));
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117 gen.setResult(this, result);
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118 }
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119 }