Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NarrowNode.java @ 18998:ec0733b5a90a
Allow final modifier on node subclasses and start adding the modifier to leaf classes.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 28 Jan 2015 02:34:14 +0100 |
parents | f57d86eb036f |
children | 2d6a2f18fe8c |
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/* * Copyright (c) 2014, 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 com.oracle.graal.compiler.common.type.*; import com.oracle.graal.compiler.common.type.ArithmeticOpTable.IntegerConvertOp.Narrow; import com.oracle.graal.compiler.common.type.ArithmeticOpTable.IntegerConvertOp.SignExtend; import com.oracle.graal.graph.spi.*; import com.oracle.graal.lir.gen.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; /** * The {@code NarrowNode} converts an integer to a narrower integer. */ @NodeInfo public final class NarrowNode extends IntegerConvertNode<Narrow, SignExtend> { public NarrowNode(ValueNode input, int resultBits) { this(input, PrimitiveStamp.getBits(input.stamp()), resultBits); assert 0 < resultBits && resultBits <= PrimitiveStamp.getBits(input.stamp()); } public NarrowNode(ValueNode input, int inputBits, int resultBits) { super(ArithmeticOpTable::getNarrow, ArithmeticOpTable::getSignExtend, inputBits, resultBits, input); } @Override public boolean isLossless() { return false; } @Override public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { ValueNode ret = super.canonical(tool, forValue); if (ret != this) { return ret; } if (forValue instanceof NarrowNode) { // zzzzzzzz yyyyxxxx -(narrow)-> yyyyxxxx -(narrow)-> xxxx // ==> zzzzzzzz yyyyxxxx -(narrow)-> xxxx NarrowNode other = (NarrowNode) forValue; return new NarrowNode(other.getValue(), other.getInputBits(), getResultBits()); } else if (forValue instanceof IntegerConvertNode) { // SignExtendNode or ZeroExtendNode IntegerConvertNode<?, ?> other = (IntegerConvertNode<?, ?>) forValue; if (getResultBits() == other.getInputBits()) { // xxxx -(extend)-> yyyy xxxx -(narrow)-> xxxx // ==> no-op return other.getValue(); } else if (getResultBits() < other.getInputBits()) { // yyyyxxxx -(extend)-> zzzzzzzz yyyyxxxx -(narrow)-> xxxx // ==> yyyyxxxx -(narrow)-> xxxx return new NarrowNode(other.getValue(), other.getInputBits(), getResultBits()); } else { if (other instanceof SignExtendNode) { // sxxx -(sign-extend)-> ssssssss sssssxxx -(narrow)-> sssssxxx // ==> sxxx -(sign-extend)-> sssssxxx return new SignExtendNode(other.getValue(), other.getInputBits(), getResultBits()); } else if (other instanceof ZeroExtendNode) { // xxxx -(zero-extend)-> 00000000 00000xxx -(narrow)-> 0000xxxx // ==> xxxx -(zero-extend)-> 0000xxxx return new ZeroExtendNode(other.getValue(), other.getInputBits(), getResultBits()); } } } return this; } @Override public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) { builder.setResult(this, gen.emitNarrow(builder.operand(getValue()), getResultBits())); } }