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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IntegerDivNode.java @ 17450:45b45f902bed

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removed Node generation (GRAAL-857)
author Doug Simon <doug.simon@oracle.com>
date Wed, 15 Oct 2014 15:35:33 +0200
parents ffb974bef674
children 9619ba4daf4c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2011, 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 static com.oracle.graal.graph.Edges.Type.*;
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26
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27 import com.oracle.graal.api.code.*;
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28 import com.oracle.graal.compiler.common.type.*;
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29 import com.oracle.graal.graph.*;
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30 import com.oracle.graal.graph.spi.*;
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31 import com.oracle.graal.nodeinfo.*;
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32 import com.oracle.graal.nodes.*;
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33 import com.oracle.graal.nodes.spi.*;
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34
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35 @NodeInfo(shortName = "/")
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36 public class IntegerDivNode extends FixedBinaryNode implements Lowerable, LIRLowerable {
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37
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38 public static IntegerDivNode create(ValueNode x, ValueNode y) {
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39 return new IntegerDivNode(x, y);
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40 }
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41
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42 protected IntegerDivNode(ValueNode x, ValueNode y) {
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43 super(IntegerStamp.OPS.getDiv().foldStamp(x.stamp(), y.stamp()), x, y);
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44 }
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45
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46 @Override
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47 public boolean inferStamp() {
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48 return updateStamp(IntegerStamp.OPS.getDiv().foldStamp(getX().stamp(), getY().stamp()));
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49 }
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50
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51 @Override
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52 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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53 if (forX.isConstant() && forY.isConstant()) {
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54 @SuppressWarnings("hiding")
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55 long y = forY.asConstant().asLong();
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56 if (y == 0) {
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57 return this; // this will trap, can not canonicalize
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58 }
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59 return ConstantNode.forIntegerStamp(stamp(), forX.asConstant().asLong() / y);
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60 } else if (forY.isConstant()) {
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61 long c = forY.asConstant().asLong();
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62 if (c == 1) {
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63 return forX;
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64 }
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65 if (c == -1) {
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66 return NegateNode.create(forX);
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67 }
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68 long abs = Math.abs(c);
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69 if (CodeUtil.isPowerOf2(abs) && forX.stamp() instanceof IntegerStamp) {
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70 ValueNode dividend = forX;
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71 IntegerStamp stampX = (IntegerStamp) forX.stamp();
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72 int log2 = CodeUtil.log2(abs);
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73 // no rounding if dividend is positive or if its low bits are always 0
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74 if (stampX.canBeNegative() || (stampX.upMask() & (abs - 1)) != 0) {
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75 int bits = PrimitiveStamp.getBits(stamp());
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76 RightShiftNode sign = RightShiftNode.create(forX, ConstantNode.forInt(bits - 1));
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77 UnsignedRightShiftNode round = UnsignedRightShiftNode.create(sign, ConstantNode.forInt(bits - log2));
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78 dividend = BinaryArithmeticNode.add(dividend, round);
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79 }
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80 RightShiftNode shift = RightShiftNode.create(dividend, ConstantNode.forInt(log2));
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81 if (c < 0) {
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82 return NegateNode.create(shift);
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83 }
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84 return shift;
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85 }
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86 }
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87
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88 // Convert the expression ((a - a % b) / b) into (a / b).
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89 if (forX instanceof SubNode) {
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90 SubNode integerSubNode = (SubNode) forX;
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91 if (integerSubNode.getY() instanceof IntegerRemNode) {
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92 IntegerRemNode integerRemNode = (IntegerRemNode) integerSubNode.getY();
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93 if (integerSubNode.stamp().isCompatible(this.stamp()) && integerRemNode.stamp().isCompatible(this.stamp()) && integerSubNode.getX() == integerRemNode.getX() &&
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94 forY == integerRemNode.getY()) {
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95 return IntegerDivNode.create(integerSubNode.getX(), forY);
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96 }
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97 }
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98 }
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99
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100 if (next() instanceof IntegerDivNode) {
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101 NodeClass nodeClass = getNodeClass();
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102 if (next().getClass() == this.getClass() && nodeClass.getEdges(Inputs).areEqualIn(this, next()) && valueEquals(next())) {
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103 return next();
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104 }
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105 }
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106
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107 return this;
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108 }
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110 @Override
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ae619d70bf4b Rename LoweringType to GuardsPhase and make it an attribute of StructuredGraphs
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111 public void lower(LoweringTool tool) {
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0fc653a9e019 made GraalCodeCacheProvider independent of CodeCacheProvider and renamed the former to LoweringProvider (GRAAL-511)
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112 tool.getLowerer().lower(this, tool);
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113 }
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114
cd205ca515dd Make integer division and remainder nodes fixed so that they can be lowered via snippets to do exception checks
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115 @Override
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116 public void generate(NodeLIRBuilderTool gen) {
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117 gen.setResult(this, gen.getLIRGeneratorTool().emitDiv(gen.operand(getX()), gen.operand(getY()), gen.state(this)));
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diff changeset
118 }
2c0c708a0ad6 Introduce DeoptimizingNode interface
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 7378
diff changeset
119
2c0c708a0ad6 Introduce DeoptimizingNode interface
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 7378
diff changeset
120 @Override
2c0c708a0ad6 Introduce DeoptimizingNode interface
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 7378
diff changeset
121 public boolean canDeoptimize() {
16218
c3260b05fd26 rename x() to getX() and y() to getY() in FixedBinaryNode
Lukas Stadler <lukas.stadler@oracle.com>
parents: 16217
diff changeset
122 return !(getY().stamp() instanceof IntegerStamp) || ((IntegerStamp) getY().stamp()).contains(0);
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
123 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
124 }