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view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/IntegerSwitchNode.java @ 7530:5e3d1a68664e
applied mx eclipseformat to all Java files
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 23 Jan 2013 16:34:57 +0100 |
parents | b1ebd583be14 |
children | 96a596d751ab |
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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.extended; import java.util.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; import com.oracle.graal.nodes.util.*; /** * The {@code IntegerSwitchNode} represents a switch on integer keys, with a sorted array of key * values. The actual implementation of the switch will be decided by the backend. */ public final class IntegerSwitchNode extends SwitchNode implements LIRLowerable, Simplifiable { private final int[] keys; /** * Constructs a integer switch instruction. The keyProbabilities and keySuccessors array contain * key.length + 1 entries, the last entry describes the default (fall through) case. * * @param value the instruction producing the value being switched on * @param successors the list of successors * @param keys the sorted list of keys * @param keyProbabilities the probabilities of the keys * @param keySuccessors the successor index for each key */ public IntegerSwitchNode(ValueNode value, BeginNode[] successors, int[] keys, double[] keyProbabilities, int[] keySuccessors) { super(value, successors, successorProbabilites(successors.length, keySuccessors, keyProbabilities), keySuccessors, keyProbabilities); assert keySuccessors.length == keys.length + 1; assert keySuccessors.length == keyProbabilities.length; this.keys = keys; } /** * Constructs a integer switch instruction. The keyProbabilities and keySuccessors array contain * key.length + 1 entries, the last entry describes the default (fall through) case. * * @param value the instruction producing the value being switched on * @param successorCount the number of successors * @param keys the sorted list of keys * @param keyProbabilities the probabilities of the keys * @param keySuccessors the successor index for each key */ public IntegerSwitchNode(ValueNode value, int successorCount, int[] keys, double[] keyProbabilities, int[] keySuccessors) { this(value, new BeginNode[successorCount], keys, keyProbabilities, keySuccessors); } /** * Gets the key at the specified index. * * @param i the index * @return the key at that index */ @Override public Constant keyAt(int i) { return Constant.forInt(keys[i]); } @Override public int keyCount() { return keys.length; } @Override public void generate(LIRGeneratorTool gen) { gen.emitSwitch(this); } @Override public void simplify(SimplifierTool tool) { if (blockSuccessorCount() == 1) { tool.addToWorkList(defaultSuccessor()); ((StructuredGraph) graph()).removeSplitPropagate(this, defaultSuccessor()); } else if (value() instanceof ConstantNode) { int constant = value().asConstant().asInt(); int survivingEdge = keySuccessorIndex(keyCount()); for (int i = 0; i < keyCount(); i++) { if (keys[i] == constant) { survivingEdge = keySuccessorIndex(i); } } for (int i = 0; i < blockSuccessorCount(); i++) { if (i != survivingEdge) { tool.deleteBranch(blockSuccessor(i)); } } tool.addToWorkList(blockSuccessor(survivingEdge)); ((StructuredGraph) graph()).removeSplit(this, blockSuccessor(survivingEdge)); } else if (value() != null) { IntegerStamp stamp = value().integerStamp(); if (!stamp.isUnrestricted()) { int validKeys = 0; for (int i = 0; i < keyCount(); i++) { if (stamp.contains(keys[i])) { validKeys++; } } if (validKeys == 0) { tool.addToWorkList(defaultSuccessor()); ((StructuredGraph) graph()).removeSplitPropagate(this, defaultSuccessor()); } else if (validKeys != keys.length) { ArrayList<BeginNode> newSuccessors = new ArrayList<>(blockSuccessorCount()); int[] newKeys = new int[validKeys]; int[] newKeySuccessors = new int[validKeys + 1]; double[] newKeyProbabilities = new double[validKeys + 1]; double totalProbability = 0; int current = 0; for (int i = 0; i < keyCount() + 1; i++) { if (i == keyCount() || stamp.contains(keys[i])) { int index = newSuccessors.indexOf(keySuccessor(i)); if (index == -1) { index = newSuccessors.size(); newSuccessors.add(keySuccessor(i)); } newKeySuccessors[current] = index; if (i < keyCount()) { newKeys[current] = keys[i]; } newKeyProbabilities[current] = keyProbability(i); totalProbability += keyProbability(i); current++; } } if (totalProbability > 0) { for (int i = 0; i < current; i++) { newKeyProbabilities[i] /= totalProbability; } } for (int i = 0; i < blockSuccessorCount(); i++) { BeginNode successor = blockSuccessor(i); if (!newSuccessors.contains(successor)) { tool.deleteBranch(successor); } setBlockSuccessor(i, null); } BeginNode[] successorsArray = newSuccessors.toArray(new BeginNode[newSuccessors.size()]); IntegerSwitchNode newSwitch = graph().add(new IntegerSwitchNode(value(), successorsArray, newKeys, newKeyProbabilities, newKeySuccessors)); ((FixedWithNextNode) predecessor()).setNext(newSwitch); GraphUtil.killWithUnusedFloatingInputs(this); } } } } }