Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IntegerConvertNode.java @ 17328:c9bb0da795d4
Backed out of changeset 17322:655f3e6b467b
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 03 Oct 2014 14:19:58 +0200 |
parents | 655f3e6b467b |
children | 98e60bdf6d05 |
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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.compiler.common.type.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; /** * An {@code IntegerConvert} converts an integer to an integer of different width. */ @NodeInfo public abstract class IntegerConvertNode extends ConvertNode implements ArithmeticLIRLowerable { protected final int resultBits; protected IntegerConvertNode(Stamp stamp, ValueNode input, int resultBits) { super(stamp, input); this.resultBits = resultBits; } public int getResultBits() { return resultBits; } public int getInputBits() { if (getValue().stamp() instanceof IntegerStamp) { return ((IntegerStamp) getValue().stamp()).getBits(); } else { return 0; } } protected ValueNode canonicalConvert(@SuppressWarnings("hiding") ValueNode value) { if (value.stamp() instanceof IntegerStamp) { int inputBits = ((IntegerStamp) value.stamp()).getBits(); if (inputBits == resultBits) { return value; } else if (value.isConstant()) { return ConstantNode.forIntegerBits(resultBits, evalConst(value.asConstant()).asLong()); } } return this; } public static ValueNode convert(ValueNode input, Stamp stamp) { return convert(input, stamp, false); } public static ValueNode convert(ValueNode input, Stamp stamp, StructuredGraph graph) { ValueNode convert = convert(input, stamp, false); if (!convert.isAlive()) { assert !convert.isDeleted(); convert = graph.addOrUnique(convert); } return convert; } public static ValueNode convertUnsigned(ValueNode input, Stamp stamp) { return convert(input, stamp, true); } public static ValueNode convert(ValueNode input, Stamp stamp, boolean zeroExtend) { IntegerStamp fromStamp = (IntegerStamp) input.stamp(); IntegerStamp toStamp = (IntegerStamp) stamp; ValueNode result; if (toStamp.getBits() == fromStamp.getBits()) { result = input; } else if (toStamp.getBits() < fromStamp.getBits()) { result = NarrowNode.create(input, toStamp.getBits()); } else if (zeroExtend) { // toStamp.getBits() > fromStamp.getBits() result = ZeroExtendNode.create(input, toStamp.getBits()); } else { // toStamp.getBits() > fromStamp.getBits() result = SignExtendNode.create(input, toStamp.getBits()); } IntegerStamp resultStamp = (IntegerStamp) result.stamp(); assert toStamp.getBits() == resultStamp.getBits(); return result; } }