1 /*
   2  * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.nodes.calc;
  24 
  25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_5;
  26 
  27 import java.util.EnumMap;
  28 
  29 import org.graalvm.compiler.core.common.calc.FloatConvert;
  30 import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
  31 import org.graalvm.compiler.core.common.type.ArithmeticOpTable.FloatConvertOp;
  32 import org.graalvm.compiler.graph.NodeClass;
  33 import org.graalvm.compiler.graph.spi.CanonicalizerTool;
  34 import org.graalvm.compiler.lir.gen.ArithmeticLIRGeneratorTool;
  35 import org.graalvm.compiler.nodeinfo.NodeInfo;
  36 import org.graalvm.compiler.nodes.ValueNode;
  37 import org.graalvm.compiler.nodes.spi.ArithmeticLIRLowerable;
  38 import org.graalvm.compiler.nodes.spi.Lowerable;
  39 import org.graalvm.compiler.nodes.spi.LoweringTool;
  40 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  41 
  42 import jdk.vm.ci.meta.Constant;
  43 import jdk.vm.ci.meta.ConstantReflectionProvider;
  44 
  45 /**
  46  * A {@code FloatConvert} converts between integers and floating point numbers according to Java
  47  * semantics.
  48  */
  49 @NodeInfo(cycles = CYCLES_5)
  50 public final class FloatConvertNode extends UnaryArithmeticNode<FloatConvertOp> implements ConvertNode, Lowerable, ArithmeticLIRLowerable {
  51     public static final NodeClass<FloatConvertNode> TYPE = NodeClass.create(FloatConvertNode.class);
  52 
  53     protected final FloatConvert op;
  54 
  55     private static final EnumMap<FloatConvert, SerializableUnaryFunction<FloatConvertOp>> getOps;
  56     static {
  57         getOps = new EnumMap<>(FloatConvert.class);
  58         for (FloatConvert op : FloatConvert.values()) {
  59             getOps.put(op, table -> table.getFloatConvert(op));
  60         }
  61     }
  62 
  63     public FloatConvertNode(FloatConvert op, ValueNode input) {
  64         super(TYPE, getOps.get(op), input);
  65         this.op = op;
  66     }
  67 
  68     public static ValueNode create(FloatConvert op, ValueNode input) {
  69         ValueNode synonym = findSynonym(input, ArithmeticOpTable.forStamp(input.stamp()).getFloatConvert(op));
  70         if (synonym != null) {
  71             return synonym;
  72         }
  73         return new FloatConvertNode(op, input);
  74     }
  75 
  76     public FloatConvert getFloatConvert() {
  77         return op;
  78     }
  79 
  80     @Override
  81     public Constant convert(Constant c, ConstantReflectionProvider constantReflection) {
  82         return getArithmeticOp().foldConstant(c);
  83     }
  84 
  85     @Override
  86     public Constant reverse(Constant c, ConstantReflectionProvider constantReflection) {
  87         FloatConvertOp reverse = ArithmeticOpTable.forStamp(stamp()).getFloatConvert(op.reverse());
  88         return reverse.foldConstant(c);
  89     }
  90 
  91     @Override
  92     public boolean isLossless() {
  93         switch (getFloatConvert()) {
  94             case F2D:
  95             case I2D:
  96                 return true;
  97             default:
  98                 return false;
  99         }
 100     }
 101 
 102     @Override
 103     public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
 104         ValueNode ret = super.canonical(tool, forValue);
 105         if (ret != this) {
 106             return ret;
 107         }
 108 
 109         if (forValue instanceof FloatConvertNode) {
 110             FloatConvertNode other = (FloatConvertNode) forValue;
 111             if (other.isLossless() && other.op == this.op.reverse()) {
 112                 return other.getValue();
 113             }
 114         }
 115         return this;
 116     }
 117 
 118     @Override
 119     public void lower(LoweringTool tool) {
 120         tool.getLowerer().lower(this, tool);
 121     }
 122 
 123     @Override
 124     public void generate(NodeLIRBuilderTool nodeValueMap, ArithmeticLIRGeneratorTool gen) {
 125         nodeValueMap.setResult(this, gen.emitFloatConvert(getFloatConvert(), nodeValueMap.operand(getValue())));
 126     }
 127 }