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/*
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* Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.nodes.calc;
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import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_1;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import org.graalvm.compiler.core.common.LIRKind;
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import org.graalvm.compiler.core.common.type.ArithmeticStamp;
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import org.graalvm.compiler.core.common.type.FloatStamp;
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import org.graalvm.compiler.core.common.type.IntegerStamp;
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import org.graalvm.compiler.core.common.type.Stamp;
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import org.graalvm.compiler.core.common.type.StampFactory;
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import org.graalvm.compiler.graph.NodeClass;
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import org.graalvm.compiler.graph.spi.CanonicalizerTool;
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import org.graalvm.compiler.lir.gen.ArithmeticLIRGeneratorTool;
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import org.graalvm.compiler.nodeinfo.NodeInfo;
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import org.graalvm.compiler.nodes.ConstantNode;
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import org.graalvm.compiler.nodes.NodeView;
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import org.graalvm.compiler.nodes.ValueNode;
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import org.graalvm.compiler.nodes.spi.ArithmeticLIRLowerable;
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import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
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import org.graalvm.compiler.serviceprovider.BufferUtil;
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import jdk.vm.ci.code.CodeUtil;
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import jdk.vm.ci.meta.JavaKind;
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import jdk.vm.ci.meta.SerializableConstant;
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/**
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* The {@code ReinterpretNode} class represents a reinterpreting conversion that changes the stamp
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* of a primitive value to some other incompatible stamp. The new stamp must have the same width as
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* the old stamp.
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*/
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@NodeInfo(cycles = CYCLES_1)
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public final class ReinterpretNode extends UnaryNode implements ArithmeticLIRLowerable {
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public static final NodeClass<ReinterpretNode> TYPE = NodeClass.create(ReinterpretNode.class);
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protected ReinterpretNode(JavaKind to, ValueNode value) {
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this(StampFactory.forKind(to), value);
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}
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protected ReinterpretNode(Stamp to, ValueNode value) {
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super(TYPE, getReinterpretStamp(to, value.stamp(NodeView.DEFAULT)), value);
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assert to instanceof ArithmeticStamp;
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}
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public static ValueNode create(JavaKind to, ValueNode value, NodeView view) {
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return create(StampFactory.forKind(to), value, view);
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}
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public static ValueNode create(Stamp to, ValueNode value, NodeView view) {
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return canonical(null, to, value, view);
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}
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private static SerializableConstant evalConst(Stamp stamp, SerializableConstant c) {
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/*
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* We don't care about byte order here. Either would produce the correct result.
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*/
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ByteBuffer buffer = ByteBuffer.wrap(new byte[c.getSerializedSize()]).order(ByteOrder.nativeOrder());
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c.serialize(buffer);
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BufferUtil.asBaseBuffer(buffer).rewind();
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SerializableConstant ret = ((ArithmeticStamp) stamp).deserialize(buffer);
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assert !buffer.hasRemaining();
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return ret;
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}
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@Override
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public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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NodeView view = NodeView.from(tool);
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return canonical(this, this.stamp(view), forValue, view);
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}
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public static ValueNode canonical(ReinterpretNode node, Stamp forStamp, ValueNode forValue, NodeView view) {
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if (forValue.isConstant()) {
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return ConstantNode.forConstant(forStamp, evalConst(forStamp, (SerializableConstant) forValue.asConstant()), null);
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}
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if (forStamp.isCompatible(forValue.stamp(view))) {
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return forValue;
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}
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if (forValue instanceof ReinterpretNode) {
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ReinterpretNode reinterpret = (ReinterpretNode) forValue;
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return new ReinterpretNode(forStamp, reinterpret.getValue());
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}
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return node != null ? node : new ReinterpretNode(forStamp, forValue);
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}
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/**
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* Compute the {@link IntegerStamp} from a {@link FloatStamp}, losing as little information as
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* possible.
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*
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* Sorting by their bit pattern reinterpreted as signed integers gives the following order of
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* floating point numbers:
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*
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* -0 | negative numbers | -Inf | NaNs | 0 | positive numbers | +Inf | NaNs
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*
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* So we can compute a better integer range if we know that the input is positive, negative,
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* finite, non-zero and/or not NaN.
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*/
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private static IntegerStamp floatToInt(FloatStamp stamp) {
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int bits = stamp.getBits();
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long signBit = 1L << (bits - 1);
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long exponentMask;
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if (bits == 64) {
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exponentMask = Double.doubleToRawLongBits(Double.POSITIVE_INFINITY);
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} else {
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assert bits == 32;
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exponentMask = Float.floatToRawIntBits(Float.POSITIVE_INFINITY);
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}
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long positiveInfinity = exponentMask;
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long negativeInfinity = CodeUtil.signExtend(signBit | positiveInfinity, bits);
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long negativeZero = CodeUtil.signExtend(signBit | 0, bits);
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if (stamp.isNaN()) {
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// special case: in addition to the range, we know NaN has all exponent bits set
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return IntegerStamp.create(bits, negativeInfinity + 1, CodeUtil.maxValue(bits), exponentMask, CodeUtil.mask(bits));
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}
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long upperBound;
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if (stamp.isNonNaN()) {
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if (stamp.upperBound() < 0.0) {
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if (stamp.lowerBound() > Double.NEGATIVE_INFINITY) {
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upperBound = negativeInfinity - 1;
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} else {
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upperBound = negativeInfinity;
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}
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} else if (stamp.upperBound() == 0.0) {
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upperBound = 0;
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} else if (stamp.upperBound() < Double.POSITIVE_INFINITY) {
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upperBound = positiveInfinity - 1;
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} else {
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upperBound = positiveInfinity;
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}
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} else {
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upperBound = CodeUtil.maxValue(bits);
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}
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long lowerBound;
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if (stamp.lowerBound() > 0.0) {
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if (stamp.isNonNaN()) {
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lowerBound = 1;
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} else {
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lowerBound = negativeInfinity + 1;
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}
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} else if (stamp.upperBound() == Double.NEGATIVE_INFINITY) {
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lowerBound = negativeInfinity;
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} else if (stamp.upperBound() < 0.0) {
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lowerBound = negativeZero + 1;
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} else {
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lowerBound = negativeZero;
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}
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return StampFactory.forInteger(bits, lowerBound, upperBound);
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}
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/**
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* Compute the {@link IntegerStamp} from a {@link FloatStamp}, losing as little information as
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* possible.
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*
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* Sorting by their bit pattern reinterpreted as signed integers gives the following order of
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* floating point numbers:
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*
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* -0 | negative numbers | -Inf | NaNs | 0 | positive numbers | +Inf | NaNs
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*
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* So from certain integer ranges we may be able to infer something about the sign, finiteness
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* or NaN-ness of the result.
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*/
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private static FloatStamp intToFloat(IntegerStamp stamp) {
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int bits = stamp.getBits();
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double minPositive;
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double maxPositive;
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long signBit = 1L << (bits - 1);
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long exponentMask;
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if (bits == 64) {
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exponentMask = Double.doubleToRawLongBits(Double.POSITIVE_INFINITY);
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minPositive = Double.MIN_VALUE;
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maxPositive = Double.MAX_VALUE;
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} else {
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assert bits == 32;
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exponentMask = Float.floatToRawIntBits(Float.POSITIVE_INFINITY);
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minPositive = Float.MIN_VALUE;
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maxPositive = Float.MAX_VALUE;
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}
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long significandMask = CodeUtil.mask(bits) & ~(signBit | exponentMask);
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long positiveInfinity = exponentMask;
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long negativeInfinity = CodeUtil.signExtend(signBit | positiveInfinity, bits);
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long negativeZero = CodeUtil.signExtend(signBit | 0, bits);
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if ((stamp.downMask() & exponentMask) == exponentMask && (stamp.downMask() & significandMask) != 0) {
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// if all exponent bits and at least one significand bit are set, the result is NaN
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return new FloatStamp(bits, Double.NaN, Double.NaN, false);
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}
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double upperBound;
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if (stamp.upperBound() < negativeInfinity) {
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if (stamp.lowerBound() > negativeZero) {
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upperBound = -minPositive;
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} else {
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upperBound = -0.0;
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}
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} else if (stamp.upperBound() < 0) {
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if (stamp.lowerBound() > negativeInfinity) {
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return new FloatStamp(bits, Double.NaN, Double.NaN, false);
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} else if (stamp.lowerBound() == negativeInfinity) {
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upperBound = Double.NEGATIVE_INFINITY;
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} else if (stamp.lowerBound() > negativeZero) {
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upperBound = -minPositive;
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} else {
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upperBound = -0.0;
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}
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} else if (stamp.upperBound() == 0) {
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upperBound = 0.0;
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} else if (stamp.upperBound() < positiveInfinity) {
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upperBound = maxPositive;
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} else {
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upperBound = Double.POSITIVE_INFINITY;
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}
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double lowerBound;
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if (stamp.lowerBound() > positiveInfinity) {
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return new FloatStamp(bits, Double.NaN, Double.NaN, false);
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} else if (stamp.lowerBound() == positiveInfinity) {
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lowerBound = Double.POSITIVE_INFINITY;
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} else if (stamp.lowerBound() > 0) {
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lowerBound = minPositive;
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} else if (stamp.lowerBound() > negativeInfinity) {
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lowerBound = 0.0;
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} else {
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lowerBound = Double.NEGATIVE_INFINITY;
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}
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boolean nonNaN;
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if ((stamp.upMask() & exponentMask) != exponentMask) {
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// NaN has all exponent bits set
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nonNaN = true;
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} else {
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boolean negativeNaNBlock = stamp.lowerBound() < 0 && stamp.upperBound() > negativeInfinity;
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boolean positiveNaNBlock = stamp.upperBound() > positiveInfinity;
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nonNaN = !negativeNaNBlock && !positiveNaNBlock;
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}
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return new FloatStamp(bits, lowerBound, upperBound, nonNaN);
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}
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private static Stamp getReinterpretStamp(Stamp toStamp, Stamp fromStamp) {
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if (toStamp instanceof IntegerStamp && fromStamp instanceof FloatStamp) {
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return floatToInt((FloatStamp) fromStamp);
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} else if (toStamp instanceof FloatStamp && fromStamp instanceof IntegerStamp) {
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return intToFloat((IntegerStamp) fromStamp);
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} else {
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return toStamp;
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}
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}
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@Override
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public boolean inferStamp() {
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return updateStamp(getReinterpretStamp(stamp(NodeView.DEFAULT), getValue().stamp(NodeView.DEFAULT)));
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}
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@Override
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public void generate(NodeLIRBuilderTool builder, ArithmeticLIRGeneratorTool gen) {
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LIRKind kind = builder.getLIRGeneratorTool().getLIRKind(stamp(NodeView.DEFAULT));
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builder.setResult(this, gen.emitReinterpret(kind, builder.operand(getValue())));
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}
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public static ValueNode reinterpret(JavaKind toKind, ValueNode value) {
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return value.graph().unique(new ReinterpretNode(toKind, value));
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}
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}
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