001/*
002 * Copyright (c) 2011, 2014, 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.common.*;
026import jdk.internal.jvmci.meta.*;
027
028import com.oracle.graal.compiler.common.calc.*;
029import com.oracle.graal.compiler.common.type.*;
030import com.oracle.graal.graph.*;
031import com.oracle.graal.graph.spi.Canonicalizable.BinaryCommutative;
032import com.oracle.graal.graph.spi.*;
033import com.oracle.graal.nodeinfo.*;
034import com.oracle.graal.nodes.*;
035import com.oracle.graal.nodes.util.*;
036
037@NodeInfo(shortName = "==")
038public final class FloatEqualsNode extends CompareNode implements BinaryCommutative<ValueNode> {
039    public static final NodeClass<FloatEqualsNode> TYPE = NodeClass.create(FloatEqualsNode.class);
040
041    public FloatEqualsNode(ValueNode x, ValueNode y) {
042        super(TYPE, Condition.EQ, false, x, y);
043        assert x.stamp() instanceof FloatStamp && y.stamp() instanceof FloatStamp : x.stamp() + " " + y.stamp();
044        assert x.stamp().isCompatible(y.stamp());
045    }
046
047    public static LogicNode create(ValueNode x, ValueNode y, ConstantReflectionProvider constantReflection) {
048        LogicNode result = CompareNode.tryConstantFold(Condition.EQ, x, y, constantReflection, false);
049        if (result != null) {
050            return result;
051        } else {
052            return new FloatEqualsNode(x, y).maybeCommuteInputs();
053        }
054    }
055
056    @Override
057    public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
058        ValueNode result = super.canonical(tool, forX, forY);
059        if (result != this) {
060            return result;
061        }
062        Stamp xStampGeneric = forX.stamp();
063        Stamp yStampGeneric = forY.stamp();
064        if (xStampGeneric instanceof FloatStamp && yStampGeneric instanceof FloatStamp) {
065            FloatStamp xStamp = (FloatStamp) xStampGeneric;
066            FloatStamp yStamp = (FloatStamp) yStampGeneric;
067            if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY) && xStamp.isNonNaN() && yStamp.isNonNaN()) {
068                return LogicConstantNode.tautology();
069            } else if (xStamp.alwaysDistinct(yStamp)) {
070                return LogicConstantNode.contradiction();
071            }
072        }
073        return this;
074    }
075
076    @Override
077    protected CompareNode duplicateModified(ValueNode newX, ValueNode newY) {
078        if (newX.stamp() instanceof FloatStamp && newY.stamp() instanceof FloatStamp) {
079            return new FloatEqualsNode(newX, newY);
080        } else if (newX.stamp() instanceof IntegerStamp && newY.stamp() instanceof IntegerStamp) {
081            return new IntegerEqualsNode(newX, newY);
082        }
083        throw JVMCIError.shouldNotReachHere();
084    }
085
086    @Override
087    public Stamp getSucceedingStampForX(boolean negated) {
088        if (!negated) {
089            return getX().stamp().join(getY().stamp());
090        }
091        return null;
092    }
093
094    @Override
095    public Stamp getSucceedingStampForY(boolean negated) {
096        if (!negated) {
097            return getX().stamp().join(getY().stamp());
098        }
099        return null;
100    }
101
102    @Override
103    public TriState tryFold(Stamp xStampGeneric, Stamp yStampGeneric) {
104        if (xStampGeneric instanceof FloatStamp && yStampGeneric instanceof FloatStamp) {
105            FloatStamp xStamp = (FloatStamp) xStampGeneric;
106            FloatStamp yStamp = (FloatStamp) yStampGeneric;
107            if (xStamp.alwaysDistinct(yStamp)) {
108                return TriState.FALSE;
109            } else if (xStamp.neverDistinct(yStamp)) {
110                return TriState.TRUE;
111            }
112        }
113        return TriState.UNKNOWN;
114    }
115}