Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ConditionalNode.java @ 15001:27c04ee36dcb
input types
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Mon, 07 Apr 2014 11:32:04 +0200 |
parents | d5a1206e1923 |
children | 288c23143d47 |
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/* * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.nodes.calc; import static com.oracle.graal.nodes.calc.CompareNode.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.java.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * The {@code ConditionalNode} class represents a comparison that yields one of two values. Note * that these nodes are not built directly from the bytecode but are introduced by canonicalization. */ public final class ConditionalNode extends BinaryNode implements Canonicalizable, LIRLowerable { @Input(InputType.Condition) private LogicNode condition; public LogicNode condition() { return condition; } public ConditionalNode(LogicNode condition) { this(condition, ConstantNode.forInt(1, condition.graph()), ConstantNode.forInt(0, condition.graph())); } public ConditionalNode(LogicNode condition, ValueNode trueValue, ValueNode falseValue) { super(trueValue.stamp().meet(falseValue.stamp()), trueValue, falseValue); assert trueValue.stamp().isCompatible(falseValue.stamp()); this.condition = condition; } @Override public boolean inferStamp() { return updateStamp(x().stamp().meet(y().stamp())); } public ValueNode trueValue() { return x(); } public ValueNode falseValue() { return y(); } @Override public Node canonical(CanonicalizerTool tool) { if (condition instanceof LogicNegationNode) { LogicNegationNode negated = (LogicNegationNode) condition; return graph().unique(new ConditionalNode(negated.getInput(), falseValue(), trueValue())); } // this optimizes the case where a value that can only be 0 or 1 is materialized to 0 or 1 if (x().isConstant() && y().isConstant() && condition instanceof IntegerEqualsNode) { IntegerEqualsNode equals = (IntegerEqualsNode) condition; if (equals.y().isConstant() && equals.y().asConstant().equals(Constant.INT_0) && equals.x().stamp() instanceof IntegerStamp) { IntegerStamp equalsXStamp = (IntegerStamp) equals.x().stamp(); if (equalsXStamp.upMask() == 1) { if (x().asConstant().equals(Constant.INT_0) && y().asConstant().equals(Constant.INT_1)) { return equals.x(); } } } } if (condition instanceof LogicConstantNode) { LogicConstantNode c = (LogicConstantNode) condition; if (c.getValue()) { return trueValue(); } else { return falseValue(); } } if (condition instanceof CompareNode && ((CompareNode) condition).condition() == Condition.EQ) { // optimize the pattern (x == y) ? x : y CompareNode compare = (CompareNode) condition; if ((compare.x() == trueValue() && compare.y() == falseValue()) || (compare.x() == falseValue() && compare.y() == trueValue())) { return falseValue(); } } if (trueValue() == falseValue()) { return trueValue(); } return this; } @Override public void generate(NodeLIRBuilderTool generator) { generator.emitConditional(this); } private ConditionalNode(@InjectedNodeParameter StructuredGraph graph, Condition condition, ValueNode x, ValueNode y) { this(createCompareNode(graph, condition, x, y)); } private ConditionalNode(ValueNode type, ValueNode object) { this(type.graph().unique(new InstanceOfDynamicNode(type, object))); } @NodeIntrinsic public static native boolean materializeCondition(@ConstantNodeParameter Condition condition, int x, int y); @NodeIntrinsic public static native boolean materializeCondition(@ConstantNodeParameter Condition condition, long x, long y); @NodeIntrinsic public static boolean materializeIsInstance(Class mirror, Object object) { return mirror.isInstance(object); } }