Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NarrowNode.java @ 16895:06c15e88d383
added factory method to all Node classes; replaced Node classes instantiation with calls to factory methods; replaced identity tests on Node classes with ' == <node class>.getGenClass()' idiom
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Mon, 18 Aug 2014 14:04:21 +0200 |
parents | cbd42807a31f |
children | 0fe4732e5181 |
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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.api.meta.*; import com.oracle.graal.compiler.common.type.*; 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.*; import com.oracle.graal.nodes.type.*; /** * The {@code NarrowNode} converts an integer to a narrower integer. */ @NodeInfo public class NarrowNode extends IntegerConvertNode { public static NarrowNode create(ValueNode input, int resultBits) { return new NarrowNodeGen(input, resultBits); } protected NarrowNode(ValueNode input, int resultBits) { super(StampTool.narrowingConversion(input.stamp(), resultBits), input, resultBits); } public static long narrow(long value, int resultBits) { long ret = value & IntegerStamp.defaultMask(resultBits); return SignExtendNode.signExtend(ret, resultBits); } @Override public Constant convert(Constant c) { return Constant.forPrimitiveInt(getResultBits(), narrow(c.asLong(), getResultBits())); } @Override public Constant reverse(Constant input) { long result = SignExtendNode.signExtend(input.asLong(), getResultBits()); return Constant.forPrimitiveInt(getInputBits(), result); } @Override public boolean isLossless() { return false; } @Override public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { ValueNode ret = canonicalConvert(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 NarrowNode.create(other.getValue(), 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 NarrowNode.create(other.getValue(), getResultBits()); } else { if (other instanceof SignExtendNode) { // sxxx -(sign-extend)-> ssssssss sssssxxx -(narrow)-> sssssxxx // ==> sxxx -(sign-extend)-> sssssxxx return SignExtendNode.create(other.getValue(), getResultBits()); } else if (other instanceof ZeroExtendNode) { // xxxx -(zero-extend)-> 00000000 00000xxx -(narrow)-> 0000xxxx // ==> xxxx -(zero-extend)-> 0000xxxx return ZeroExtendNode.create(other.getValue(), getResultBits()); } } } return this; } @Override public boolean inferStamp() { return updateStamp(StampTool.narrowingConversion(getValue().stamp(), getResultBits())); } @Override public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) { builder.setResult(this, gen.emitNarrow(builder.operand(getValue()), getResultBits())); } }