Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/SignExtendNode.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 SignExtendNode} converts an integer to a wider integer using sign extension. */ @NodeInfo public class SignExtendNode extends IntegerConvertNode { public static SignExtendNode create(ValueNode input, int resultBits) { return new SignExtendNodeGen(input, resultBits); } protected SignExtendNode(ValueNode input, int resultBits) { super(StampTool.signExtend(input.stamp(), resultBits), input, resultBits); } public static long signExtend(long value, int inputBits) { if (inputBits < 64) { if ((value >>> (inputBits - 1) & 1) == 1) { return value | (-1L << inputBits); } else { return value & ~(-1L << inputBits); } } else { return value; } } @Override public Constant convert(Constant c) { return Constant.forPrimitiveInt(getResultBits(), signExtend(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 ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { ValueNode ret = canonicalConvert(forValue); if (ret != this) { return ret; } if (forValue instanceof SignExtendNode) { // sxxx -(sign-extend)-> ssss sxxx -(sign-extend)-> ssssssss sssssxxx // ==> sxxx -(sign-extend)-> ssssssss sssssxxx SignExtendNode other = (SignExtendNode) forValue; return SignExtendNode.create(other.getValue(), getResultBits()); } else if (forValue instanceof ZeroExtendNode) { ZeroExtendNode other = (ZeroExtendNode) forValue; if (other.getResultBits() > other.getInputBits()) { // sxxx -(zero-extend)-> 0000 sxxx -(sign-extend)-> 00000000 0000sxxx // ==> sxxx -(zero-extend)-> 00000000 0000sxxx return ZeroExtendNode.create(other.getValue(), getResultBits()); } } if (forValue.stamp() instanceof IntegerStamp) { IntegerStamp inputStamp = (IntegerStamp) forValue.stamp(); if ((inputStamp.upMask() & (1L << (getInputBits() - 1))) == 0L) { // 0xxx -(sign-extend)-> 0000 0xxx // ==> 0xxx -(zero-extend)-> 0000 0xxx return ZeroExtendNode.create(forValue, getResultBits()); } } return this; } @Override public boolean inferStamp() { return updateStamp(StampTool.signExtend(getValue().stamp(), getResultBits())); } @Override public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) { builder.setResult(this, gen.emitSignExtend(builder.operand(getValue()), getInputBits(), getResultBits())); } }