1 /*
   2  * Copyright (c) 2011, 2015, 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_32;
  26 
  27 import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
  28 import org.graalvm.compiler.core.common.type.FloatStamp;
  29 import org.graalvm.compiler.core.common.type.ArithmeticOpTable.BinaryOp;
  30 import org.graalvm.compiler.core.common.type.ArithmeticOpTable.BinaryOp.Div;
  31 import org.graalvm.compiler.core.common.type.Stamp;
  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.ConstantNode;
  37 import org.graalvm.compiler.nodes.ValueNode;
  38 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  39 
  40 import jdk.vm.ci.meta.Constant;
  41 
  42 @NodeInfo(shortName = "/", cycles = CYCLES_32)
  43 public class FloatDivNode extends BinaryArithmeticNode<Div> {
  44 
  45     public static final NodeClass<FloatDivNode> TYPE = NodeClass.create(FloatDivNode.class);
  46 
  47     public FloatDivNode(ValueNode x, ValueNode y) {
  48         this(TYPE, x, y);
  49     }
  50 
  51     protected FloatDivNode(NodeClass<? extends FloatDivNode> c, ValueNode x, ValueNode y) {
  52         super(c, ArithmeticOpTable::getDiv, x, y);
  53         assert stamp instanceof FloatStamp;
  54     }
  55 
  56     public static ValueNode create(ValueNode x, ValueNode y) {
  57         BinaryOp<Div> op = ArithmeticOpTable.forStamp(x.stamp()).getDiv();
  58         Stamp stamp = op.foldStamp(x.stamp(), y.stamp());
  59         ConstantNode tryConstantFold = tryConstantFold(op, x, y, stamp);
  60         if (tryConstantFold != null) {
  61             return tryConstantFold;
  62         }
  63         return canonical(null, op, x, y);
  64     }
  65 
  66     @Override
  67     public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
  68         ValueNode ret = super.canonical(tool, forX, forY);
  69         if (ret != this) {
  70             return ret;
  71         }
  72 
  73         return canonical(this, getOp(forX, forY), forX, forY);
  74     }
  75 
  76     private static ValueNode canonical(FloatDivNode self, BinaryOp<Div> op, ValueNode forX, ValueNode forY) {
  77         if (forY.isConstant()) {
  78             Constant c = forY.asConstant();
  79             if (op.isNeutral(c)) {
  80                 return forX;
  81             }
  82         }
  83         return self != null ? self : new FloatDivNode(forX, forY);
  84     }
  85 
  86     @Override
  87     public void generate(NodeLIRBuilderTool nodeValueMap, ArithmeticLIRGeneratorTool gen) {
  88         nodeValueMap.setResult(this, gen.emitDiv(nodeValueMap.operand(getX()), nodeValueMap.operand(getY()), null));
  89     }
  90 }