001/*
002 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.nodes.calc;
024
025import jdk.internal.jvmci.code.*;
026
027import com.oracle.graal.compiler.common.type.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.graph.spi.*;
030import com.oracle.graal.nodeinfo.*;
031import com.oracle.graal.nodes.*;
032import com.oracle.graal.nodes.spi.*;
033
034@NodeInfo(shortName = "|/|")
035public class UnsignedDivNode extends FixedBinaryNode implements Lowerable, LIRLowerable {
036
037    public static final NodeClass<UnsignedDivNode> TYPE = NodeClass.create(UnsignedDivNode.class);
038
039    public UnsignedDivNode(ValueNode x, ValueNode y) {
040        this(TYPE, x, y);
041    }
042
043    protected UnsignedDivNode(NodeClass<? extends UnsignedDivNode> c, ValueNode x, ValueNode y) {
044        super(c, x.stamp().unrestricted(), x, y);
045    }
046
047    @Override
048    public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
049        int bits = ((IntegerStamp) stamp()).getBits();
050        if (forX.isConstant() && forY.isConstant()) {
051            long yConst = CodeUtil.zeroExtend(forY.asJavaConstant().asLong(), bits);
052            if (yConst == 0) {
053                return this; // this will trap, cannot canonicalize
054            }
055            return ConstantNode.forIntegerStamp(stamp(), UnsignedMath.divide(CodeUtil.zeroExtend(forX.asJavaConstant().asLong(), bits), yConst));
056        } else if (forY.isConstant()) {
057            long c = CodeUtil.zeroExtend(forY.asJavaConstant().asLong(), bits);
058            if (c == 1) {
059                return forX;
060            }
061            if (CodeUtil.isPowerOf2(c)) {
062                return new UnsignedRightShiftNode(forX, ConstantNode.forInt(CodeUtil.log2(c)));
063            }
064        }
065        return this;
066    }
067
068    @Override
069    public void lower(LoweringTool tool) {
070        tool.getLowerer().lower(this, tool);
071    }
072
073    @Override
074    public void generate(NodeLIRBuilderTool gen) {
075        gen.setResult(this, gen.getLIRGeneratorTool().emitUDiv(gen.operand(getX()), gen.operand(getY()), gen.state(this)));
076    }
077
078    @Override
079    public boolean canDeoptimize() {
080        return !(getY().stamp() instanceof IntegerStamp) || ((IntegerStamp) getY().stamp()).contains(0);
081    }
082
083    @NodeIntrinsic
084    public static native int unsignedDivide(int a, int b);
085
086    @NodeIntrinsic
087    public static native long unsignedDivide(long a, long b);
088}