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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/FloatSubNode.java @ 16919:0fe4732e5181

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made use of generated Node classes predicated on value of graal.useGeneratedNodes system property (default is false)
author Doug Simon <doug.simon@oracle.com>
date Mon, 25 Aug 2014 13:45:12 +0200
parents f90dcdbbb75e
children 5762848171e7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 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.lir.gen.*;
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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.spi.*;
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32 import com.oracle.graal.nodes.util.*;
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33
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34 @NodeInfo(shortName = "-")
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35 public class FloatSubNode extends FloatArithmeticNode {
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36
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37 public static FloatSubNode create(ValueNode x, ValueNode y, boolean isStrictFP) {
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38 return USE_GENERATED_NODES ? new FloatSubNodeGen(x, y, isStrictFP) : new FloatSubNode(x, y, isStrictFP);
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39 }
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40
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41 public static Class<? extends FloatSubNode> getGenClass() {
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42 return USE_GENERATED_NODES ? FloatSubNodeGen.class : FloatSubNode.class;
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43 }
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06c15e88d383 added factory method to all Node classes; replaced Node classes instantiation with calls to factory methods; replaced identity tests on Node classes with ' == <node class>.getGenClass()' idiom
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45 protected FloatSubNode(ValueNode x, ValueNode y, boolean isStrictFP) {
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46 super(x.stamp().unrestricted(), x, y, isStrictFP);
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47 }
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48
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49 public Constant evalConst(Constant... inputs) {
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50 assert inputs.length == 2;
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51 assert inputs[0].getKind() == inputs[1].getKind();
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52 if (inputs[0].getKind() == Kind.Float) {
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53 return Constant.forFloat(inputs[0].asFloat() - inputs[1].asFloat());
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54 } else {
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55 assert inputs[0].getKind() == Kind.Double;
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56 return Constant.forDouble(inputs[0].asDouble() - inputs[1].asDouble());
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57 }
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58 }
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59
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60 @Override
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61 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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62 if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY)) {
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63 return ConstantNode.forFloatingStamp(stamp(), 0.0f);
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64 }
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65 if (forX.isConstant() && forY.isConstant()) {
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66 return ConstantNode.forPrimitive(evalConst(forX.asConstant(), forY.asConstant()));
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67 }
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68 // Constant -0.0 is an additive identity, so (-0.0) - x == (-0.0) + (-x) == -x.
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69 if (forX.isConstant()) {
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70 @SuppressWarnings("hiding")
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71 Constant x = forX.asConstant();
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72 switch (x.getKind()) {
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73 case Float:
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74 if (Float.compare(x.asFloat(), -0.0f) == 0) {
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06c15e88d383 added factory method to all Node classes; replaced Node classes instantiation with calls to factory methods; replaced identity tests on Node classes with ' == <node class>.getGenClass()' idiom
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75 return NegateNode.create(forY);
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76 }
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77 break;
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78 case Double:
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79 if (Double.compare(x.asDouble(), -0.0) == 0) {
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80 return NegateNode.create(forY);
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81 }
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82 break;
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83 default:
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84 throw GraalGraphInternalError.shouldNotReachHere();
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85 }
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86 }
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87 // Constant -0.0 can't be eliminated since it can affect the sign of the result.
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88 // Constant 0.0 is a subtractive identity.
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89 if (forY.isConstant()) {
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90 @SuppressWarnings("hiding")
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91 Constant y = forY.asConstant();
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92 switch (y.getKind()) {
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93 case Float:
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94 // use Float.compare because -0.0f == 0.0f
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95 if (Float.compare(y.asFloat(), 0.0f) == 0) {
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96 return forX;
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97 }
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98 break;
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99 case Double:
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100 // use Double.compare because -0.0 == 0.0
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101 if (Double.compare(y.asDouble(), 0.0) == 0) {
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102 return forX;
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103 }
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104 break;
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105 default:
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106 throw GraalGraphInternalError.shouldNotReachHere();
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107 }
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108 }
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109 /*
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110 * JVM spec, Chapter 6, dsub/fsub bytecode: For double subtraction, it is always the case
c914e5837b4b More canonicalizations in FloatAdd/SubNode.
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111 * that a-b produces the same result as a+(-b).
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112 */
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113 if (forY instanceof NegateNode) {
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114 return FloatAddNode.create(forX, ((NegateNode) forY).getValue(), isStrictFP());
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115 }
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116 return this;
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117 }
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118
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119 @Override
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120 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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121 builder.setResult(this, gen.emitSub(builder.operand(getX()), builder.operand(getY())));
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122 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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