Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ZeroExtendNode.java @ 16919:0fe4732e5181
made use of generated Node classes predicated on value of graal.useGeneratedNodes system property (default is false)
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 25 Aug 2014 13:45:12 +0200 |
parents | 06c15e88d383 |
children | 189479d72dc8 |
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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.calc.*; 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 ZeroExtendNode} converts an integer to a wider integer using zero extension. */ @NodeInfo public class ZeroExtendNode extends IntegerConvertNode { public static ZeroExtendNode create(ValueNode input, int resultBits) { return USE_GENERATED_NODES ? new ZeroExtendNodeGen(input, resultBits) : new ZeroExtendNode(input, resultBits); } protected ZeroExtendNode(ValueNode input, int resultBits) { super(StampTool.zeroExtend(input.stamp(), resultBits), input, resultBits); } public static long zeroExtend(long value, int inputBits) { if (inputBits < 64) { return value & ~(-1L << inputBits); } else { return value; } } @Override public Constant convert(Constant c) { return Constant.forPrimitiveInt(getResultBits(), zeroExtend(c.asLong(), getInputBits())); } @Override public Constant reverse(Constant c) { return Constant.forPrimitiveInt(getInputBits(), NarrowNode.narrow(c.asLong(), getInputBits())); } @Override public boolean isLossless() { return true; } @Override public boolean preservesOrder(Condition op) { switch (op) { case GE: case GT: case LE: case LT: return false; default: return true; } } @Override public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { ValueNode ret = canonicalConvert(forValue); if (ret != this) { return ret; } if (forValue instanceof ZeroExtendNode) { // xxxx -(zero-extend)-> 0000 xxxx -(zero-extend)-> 00000000 0000xxxx // ==> xxxx -(zero-extend)-> 00000000 0000xxxx ZeroExtendNode other = (ZeroExtendNode) forValue; return ZeroExtendNode.create(other.getValue(), getResultBits()); } if (forValue instanceof NarrowNode) { NarrowNode narrow = (NarrowNode) forValue; Stamp inputStamp = narrow.getValue().stamp(); if (inputStamp instanceof IntegerStamp && inputStamp.isCompatible(stamp())) { IntegerStamp istamp = (IntegerStamp) inputStamp; long mask = IntegerStamp.defaultMask(PrimitiveStamp.getBits(narrow.stamp())); if (((istamp.upMask() | istamp.downMask()) & ~mask) == 0) { // The original value is in the range of the masked zero extended result so // simply return the original input. return narrow.getValue(); } } } return this; } @Override public boolean inferStamp() { return updateStamp(StampTool.zeroExtend(getValue().stamp(), getResultBits())); } @Override public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) { builder.setResult(this, gen.emitZeroExtend(builder.operand(getValue()), getInputBits(), getResultBits())); } }