Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ZeroExtendNode.java @ 21543:93c50cefb9e8
moved GraalInternalError to com.oracle.jvmci.common and renamed it to JVMCIError (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Mon, 25 May 2015 23:30:34 +0200 |
parents | 8fc336a04d77 |
children | 48c1ebd24120 |
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/* * Copyright (c) 2014, 2015, 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.code.*; import com.oracle.graal.compiler.common.calc.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.compiler.common.type.ArithmeticOpTable.IntegerConvertOp; import com.oracle.graal.compiler.common.type.ArithmeticOpTable.IntegerConvertOp.Narrow; import com.oracle.graal.compiler.common.type.ArithmeticOpTable.IntegerConvertOp.ZeroExtend; import com.oracle.graal.graph.*; 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 ZeroExtendNode} converts an integer to a wider integer using zero extension. */ @NodeInfo public final class ZeroExtendNode extends IntegerConvertNode<ZeroExtend, Narrow> { public static final NodeClass<ZeroExtendNode> TYPE = NodeClass.create(ZeroExtendNode.class); public ZeroExtendNode(ValueNode input, int resultBits) { this(input, PrimitiveStamp.getBits(input.stamp()), resultBits); assert 0 < PrimitiveStamp.getBits(input.stamp()) && PrimitiveStamp.getBits(input.stamp()) <= resultBits; } public ZeroExtendNode(ValueNode input, int inputBits, int resultBits) { super(TYPE, ArithmeticOpTable::getZeroExtend, ArithmeticOpTable::getNarrow, inputBits, resultBits, input); } public static ValueNode create(ValueNode input, int resultBits) { return create(input, PrimitiveStamp.getBits(input.stamp()), resultBits); } public static ValueNode create(ValueNode input, int inputBits, int resultBits) { IntegerConvertOp<ZeroExtend> signExtend = ArithmeticOpTable.forStamp(input.stamp()).getZeroExtend(); ValueNode synonym = findSynonym(signExtend, input, inputBits, resultBits, signExtend.foldStamp(inputBits, resultBits, input.stamp())); if (synonym != null) { return synonym; } else { return new ZeroExtendNode(input, inputBits, resultBits); } } @Override public boolean isLossless() { return true; } @Override public boolean preservesOrder(Condition cond) { switch (cond) { case GE: case GT: case LE: case LT: return false; default: return true; } } @Override public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { ValueNode ret = super.canonical(tool, 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 new ZeroExtendNode(other.getValue(), other.getInputBits(), 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 = CodeUtil.mask(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 void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) { builder.setResult(this, gen.emitZeroExtend(builder.operand(getValue()), getInputBits(), getResultBits())); } }