Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ZeroExtendNode.java @ 14850:fbae9be45c95
Merge.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Wed, 26 Mar 2014 20:44:11 +0100 |
parents | 47e4d2e01c6e 6ce6c4ccba8f |
children | f6630873316b |
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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.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.extended.*; 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. */ public class ZeroExtendNode extends IntegerConvertNode { public 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 Node canonical(CanonicalizerTool tool) { ValueNode ret = canonicalConvert(); if (ret != null) { return ret; } if (getInput() instanceof ZeroExtendNode) { // xxxx -(zero-extend)-> 0000 xxxx -(zero-extend)-> 00000000 0000xxxx // ==> xxxx -(zero-extend)-> 00000000 0000xxxx ZeroExtendNode other = (ZeroExtendNode) getInput(); return graph().unique(new ZeroExtendNode(other.getInput(), getResultBits())); } return this; } @Override public boolean inferStamp() { return updateStamp(StampTool.zeroExtend(getInput().stamp(), getResultBits())); } @Override public void generate(NodeLIRGeneratorTool gen) { gen.setResult(this, gen.getLIRGeneratorTool().emitZeroExtend(gen.operand(getInput()), getInputBits(), getResultBits())); } @Override public boolean generate(MemoryArithmeticLIRLowerer gen, Access access) { Value result = gen.emitZeroExtendMemory(getInputBits(), getResultBits(), access); if (result != null) { gen.setResult(this, result); } return result != null; } }