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