Mercurial > hg > truffle
view graal/com.oracle.graal.word/src/com/oracle/graal/word/nodes/WordCastNode.java @ 15935:705fe382e2da
LSRA optimization: check if optimization is feasible.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Mon, 26 May 2014 16:57:16 +0200 |
parents | 882f4cb7cfcf |
children | c0b8d395368b |
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/* * Copyright (c) 2013, 2013, 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.word.nodes; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.word.phases.*; /** * Cast between Word and Object that is introduced by the {@link WordTypeRewriterPhase}. It has an * impact on the pointer maps for the GC, so it must not be scheduled or optimized away. */ public final class WordCastNode extends FixedWithNextNode implements LIRLowerable, Canonicalizable { public static WordCastNode wordToObject(ValueNode input, Kind wordKind) { assert input.getKind() == wordKind; return new WordCastNode(StampFactory.object(), input); } public static WordCastNode objectToWord(ValueNode input, Kind wordKind) { assert input.getKind() == Kind.Object; return new WordCastNode(StampFactory.forKind(wordKind), input); } @Input private ValueNode input; private WordCastNode(Stamp stamp, ValueNode input) { super(stamp); this.input = input; } public ValueNode getInput() { return input; } @Override public Node canonical(CanonicalizerTool tool) { if (usages().count() == 0) { /* If the cast is unused, it can be eliminated. */ return input; } return this; } @Override public void generate(NodeLIRBuilderTool generator) { assert getKind() != input.getKind(); assert generator.getLIRGeneratorTool().target().getSizeInBytes(getKind()) == generator.getLIRGeneratorTool().target().getSizeInBytes(input.getKind()); AllocatableValue result = generator.getLIRGeneratorTool().newVariable(getKind()); generator.getLIRGeneratorTool().emitMove(result, generator.operand(input)); generator.setResult(this, result); } }