1 /* 2 * Copyright (c) 2016, 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.replacements.amd64; 24 25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_1; 26 27 import org.graalvm.compiler.core.common.type.FloatStamp; 28 import org.graalvm.compiler.core.common.type.Stamp; 29 import org.graalvm.compiler.debug.GraalError; 30 import org.graalvm.compiler.graph.NodeClass; 31 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 32 import org.graalvm.compiler.lir.amd64.AMD64ArithmeticLIRGeneratorTool; 33 import org.graalvm.compiler.lir.amd64.AMD64ArithmeticLIRGeneratorTool.RoundingMode; 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.calc.UnaryNode; 39 import org.graalvm.compiler.nodes.spi.ArithmeticLIRLowerable; 40 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 41 42 import jdk.vm.ci.meta.JavaConstant; 43 import jdk.vm.ci.meta.JavaKind; 44 45 /** 46 * Round floating-point value. 47 */ 48 @NodeInfo(cycles = CYCLES_1) 49 public final class AMD64RoundNode extends UnaryNode implements ArithmeticLIRLowerable { 50 public static final NodeClass<AMD64RoundNode> TYPE = NodeClass.create(AMD64RoundNode.class); 51 52 private final RoundingMode mode; 53 54 public AMD64RoundNode(ValueNode value, RoundingMode mode) { 55 super(TYPE, roundStamp((FloatStamp) value.stamp(), mode), value); 56 this.mode = mode; 57 } 58 59 private static double round(RoundingMode mode, double input) { 60 switch (mode) { 61 case DOWN: 62 return Math.floor(input); 63 case NEAREST: 64 return Math.rint(input); 65 case UP: 66 return Math.ceil(input); 67 case TRUNCATE: 68 return (long) input; 69 default: 70 throw GraalError.unimplemented("unimplemented RoundingMode " + mode); 71 } 72 } 73 74 private static FloatStamp roundStamp(FloatStamp stamp, RoundingMode mode) { 75 double min = stamp.lowerBound(); 76 min = Math.min(min, round(mode, min)); 77 78 double max = stamp.upperBound(); 79 max = Math.max(max, round(mode, max)); 80 81 return new FloatStamp(stamp.getBits(), min, max, stamp.isNonNaN()); 82 } 83 84 @Override 85 public Stamp foldStamp(Stamp newStamp) { 86 assert newStamp.isCompatible(getValue().stamp()); 87 return roundStamp((FloatStamp) newStamp, mode); 88 } 89 90 public ValueNode tryFold(ValueNode input) { 91 if (input.isConstant()) { 92 JavaConstant c = input.asJavaConstant(); 93 if (c.getJavaKind() == JavaKind.Double) { 94 return ConstantNode.forDouble(round(mode, c.asDouble())); 95 } else if (c.getJavaKind() == JavaKind.Float) { 96 return ConstantNode.forFloat((float) round(mode, c.asFloat())); 97 } 98 } 99 return null; 100 } 101 102 @Override 103 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { 104 ValueNode folded = tryFold(forValue); 105 return folded != null ? folded : this; 106 } 107 108 @Override 109 public void generate(NodeLIRBuilderTool builder, ArithmeticLIRGeneratorTool gen) { 110 builder.setResult(this, ((AMD64ArithmeticLIRGeneratorTool) gen).emitRound(builder.operand(getValue()), mode)); 111 } 112 }