1 /* 2 * Copyright (c) 2012, 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 24 25 package org.graalvm.compiler.loop; 26 27 import static org.graalvm.compiler.loop.MathUtil.mul; 28 29 import org.graalvm.compiler.core.common.type.IntegerStamp; 30 import org.graalvm.compiler.core.common.type.Stamp; 31 import org.graalvm.compiler.nodes.ConstantNode; 32 import org.graalvm.compiler.nodes.NodeView; 33 import org.graalvm.compiler.nodes.ValueNode; 34 import org.graalvm.compiler.nodes.calc.IntegerConvertNode; 35 import org.graalvm.compiler.nodes.calc.NegateNode; 36 import org.graalvm.compiler.nodes.util.GraphUtil; 37 38 public class DerivedScaledInductionVariable extends DerivedInductionVariable { 39 40 private final ValueNode scale; 41 private final ValueNode value; 42 43 public DerivedScaledInductionVariable(LoopEx loop, InductionVariable base, ValueNode scale, ValueNode value) { 44 super(loop, base); 45 this.scale = scale; 46 this.value = value; 47 } 48 49 public DerivedScaledInductionVariable(LoopEx loop, InductionVariable base, NegateNode value) { 50 super(loop, base); 51 this.scale = ConstantNode.forIntegerStamp(value.stamp(NodeView.DEFAULT), -1, value.graph()); 52 this.value = value; 53 } 54 55 public ValueNode getScale() { 56 return scale; 57 } 58 59 @Override 60 public ValueNode valueNode() { 61 return value; 62 } 63 64 @Override 65 public Direction direction() { 66 Direction baseDirection = base.direction(); 67 if (baseDirection == null) { 68 return null; 69 } 70 Stamp stamp = scale.stamp(NodeView.DEFAULT); 71 if (stamp instanceof IntegerStamp) { 72 IntegerStamp integerStamp = (IntegerStamp) stamp; 73 if (integerStamp.isStrictlyPositive()) { 74 return baseDirection; 75 } else if (integerStamp.isStrictlyNegative()) { 76 return baseDirection.opposite(); 77 } 78 } 79 return null; 80 } 81 82 @Override 83 public ValueNode initNode() { 84 return mul(graph(), base.initNode(), scale); 85 } 86 87 @Override 88 public ValueNode strideNode() { 89 return mul(graph(), base.strideNode(), scale); 90 } 91 92 @Override 93 public boolean isConstantInit() { 94 return scale.isConstant() && base.isConstantInit(); 95 } 96 97 @Override 98 public boolean isConstantStride() { 99 return scale.isConstant() && base.isConstantStride(); 100 } 101 102 @Override 103 public long constantInit() { 104 return base.constantInit() * scale.asJavaConstant().asLong(); 105 } 106 107 @Override 108 public long constantStride() { 109 return base.constantStride() * scale.asJavaConstant().asLong(); 110 } 111 112 @Override 113 public ValueNode extremumNode(boolean assumePositiveTripCount, Stamp stamp) { 114 return mul(graph(), base.extremumNode(assumePositiveTripCount, stamp), IntegerConvertNode.convert(scale, stamp, graph(), NodeView.DEFAULT)); 115 } 116 117 @Override 118 public ValueNode exitValueNode() { 119 return mul(graph(), base.exitValueNode(), scale); 120 } 121 122 @Override 123 public boolean isConstantExtremum() { 124 return scale.isConstant() && base.isConstantExtremum(); 125 } 126 127 @Override 128 public long constantExtremum() { 129 return base.constantExtremum() * scale.asJavaConstant().asLong(); 130 } 131 132 @Override 133 public void deleteUnusedNodes() { 134 GraphUtil.tryKillUnused(scale); 135 } 136 137 @Override 138 public String toString() { 139 return String.format("DerivedScaleInductionVariable base (%s) %s %s", base, value.getNodeClass().shortName(), scale); 140 } 141 }