/****************************************************************************

**

** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtCore module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this

** file. Please review the following information to ensure the GNU Lesser

** General Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights. These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** GNU General Public License Usage

** Alternatively, this file may be used under the terms of the GNU General

** Public License version 3.0 as published by the Free Software Foundation

** and appearing in the file LICENSE.GPL included in the packaging of this

** file. Please review the following information to ensure the GNU General

** Public License version 3.0 requirements will be met:

** http://www.gnu.org/copyleft/gpl.html.

**

** Other Usage

** Alternatively, this file may be used in accordance with the terms and

** conditions contained in a signed written agreement between you and Nokia.

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** $QT_END_LICENSE$

**

****************************************************************************/

#ifndef QNUMERIC_P_H

#define QNUMERIC_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include "QtCore/qglobal.h"

QT_BEGIN_NAMESPACE

#if !defined(Q_CC_MIPS)

static const union { unsigned char c[8]; double d; } qt_be_inf_bytes = { { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 } };

static const union { unsigned char c[8]; double d; } qt_le_inf_bytes = { { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f } };

static const union { unsigned char c[8]; double d; } qt_armfpa_inf_bytes = { { 0, 0, 0xf0, 0x7f, 0, 0, 0, 0 } };

static inline double qt_inf()

{

#ifdef QT_ARMFPA

    return qt_armfpa_inf_bytes.d;

#else

    return (QSysInfo::ByteOrder == QSysInfo::BigEndian

            ? qt_be_inf_bytes.d

            : qt_le_inf_bytes.d);

#endif

}

// Signaling NAN

static const union { unsigned char c[8]; double d; } qt_be_snan_bytes = { { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 } };

static const union { unsigned char c[8]; double d; } qt_le_snan_bytes = { { 0, 0, 0, 0, 0, 0, 0xf8, 0x7f } };

static const union { unsigned char c[8]; double d; } qt_armfpa_snan_bytes = { { 0, 0, 0xf8, 0x7f, 0, 0, 0, 0 } };

static inline double qt_snan()

{

#ifdef QT_ARMFPA

    return qt_armfpa_snan_bytes.d;

#else

    return (QSysInfo::ByteOrder == QSysInfo::BigEndian

            ? qt_be_snan_bytes.d

            : qt_le_snan_bytes.d);

#endif

}

// Quiet NAN

static const union { unsigned char c[8]; double d; } qt_be_qnan_bytes = { { 0xff, 0xf8, 0, 0, 0, 0, 0, 0 } };

static const union { unsigned char c[8]; double d; } qt_le_qnan_bytes = { { 0, 0, 0, 0, 0, 0, 0xf8, 0xff } };

static const union { unsigned char c[8]; double d; } qt_armfpa_qnan_bytes = { { 0, 0, 0xf8, 0xff, 0, 0, 0, 0 } };

static inline double qt_qnan()

{

#ifdef QT_ARMFPA

    return qt_armfpa_qnan_bytes.d;

#else

    return (QSysInfo::ByteOrder == QSysInfo::BigEndian

            ? qt_be_qnan_bytes.d

            : qt_le_qnan_bytes.d);

#endif

}

#else // Q_CC_MIPS

static const unsigned char qt_be_inf_bytes[] = { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 };

static const unsigned char qt_le_inf_bytes[] = { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f };

static const unsigned char qt_armfpa_inf_bytes[] = { 0, 0, 0xf0, 0x7f, 0, 0, 0, 0 };

static inline double qt_inf()

{

    const unsigned char *bytes;

#ifdef QT_ARMFPA

    bytes = qt_armfpa_inf_bytes;

#else

    bytes = (QSysInfo::ByteOrder == QSysInfo::BigEndian

             ? qt_be_inf_bytes

             : qt_le_inf_bytes);

#endif

    union { unsigned char c[8]; double d; } returnValue;

    qMemCopy(returnValue.c, bytes, sizeof(returnValue.c));

    return returnValue.d;

}

// Signaling NAN

static const unsigned char qt_be_snan_bytes[] = { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 };

static const unsigned char qt_le_snan_bytes[] = { 0, 0, 0, 0, 0, 0, 0xf8, 0x7f };

static const unsigned char qt_armfpa_snan_bytes[] = { 0, 0, 0xf8, 0x7f, 0, 0, 0, 0 };

static inline double qt_snan()

{

    const unsigned char *bytes;

#ifdef QT_ARMFPA

    bytes = qt_armfpa_snan_bytes;

#else

    bytes = (QSysInfo::ByteOrder == QSysInfo::BigEndian

             ? qt_be_snan_bytes

             : qt_le_snan_bytes);

#endif

    union { unsigned char c[8]; double d; } returnValue;

    qMemCopy(returnValue.c, bytes, sizeof(returnValue.c));

    return returnValue.d;

}

// Quiet NAN

static const unsigned char qt_be_qnan_bytes[] = { 0xff, 0xf8, 0, 0, 0, 0, 0, 0 };

static const unsigned char qt_le_qnan_bytes[] = { 0, 0, 0, 0, 0, 0, 0xf8, 0xff };

static const unsigned char qt_armfpa_qnan_bytes[] = { 0, 0, 0xf8, 0xff, 0, 0, 0, 0 };

static inline double qt_qnan()

{

    const unsigned char *bytes;

#ifdef QT_ARMFPA

    bytes = qt_armfpa_qnan_bytes;

#else

    bytes = (QSysInfo::ByteOrder == QSysInfo::BigEndian

             ? qt_be_qnan_bytes

             : qt_le_qnan_bytes);

#endif

    union { unsigned char c[8]; double d; } returnValue;

    qMemCopy(returnValue.c, bytes, sizeof(returnValue.c));

    return returnValue.d;

}

#endif // Q_CC_MIPS

static inline bool qt_is_inf(double d)

{

    uchar *ch = (uchar *)&d;

#ifdef QT_ARMFPA

    return (ch[3] & 0x7f) == 0x7f && ch[2] == 0xf0;

#else

    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {

        return (ch[0] & 0x7f) == 0x7f && ch[1] == 0xf0;

    } else {

        return (ch[7] & 0x7f) == 0x7f && ch[6] == 0xf0;

    }

#endif

}

static inline bool qt_is_nan(double d)

{

    uchar *ch = (uchar *)&d;

#ifdef QT_ARMFPA

    return (ch[3] & 0x7f) == 0x7f && ch[2] > 0xf0;

#else

    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {

        return (ch[0] & 0x7f) == 0x7f && ch[1] > 0xf0;

    } else {

        return (ch[7] & 0x7f) == 0x7f && ch[6] > 0xf0;

    }

#endif

}

static inline bool qt_is_finite(double d)

{

    uchar *ch = (uchar *)&d;

#ifdef QT_ARMFPA

    return (ch[3] & 0x7f) != 0x7f || (ch[2] & 0xf0) != 0xf0;

#else

    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {

        return (ch[0] & 0x7f) != 0x7f || (ch[1] & 0xf0) != 0xf0;

    } else {

        return (ch[7] & 0x7f) != 0x7f || (ch[6] & 0xf0) != 0xf0;

    }

#endif

}

static inline bool qt_is_inf(float d)

{

    uchar *ch = (uchar *)&d;

    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {

        return (ch[0] & 0x7f) == 0x7f && ch[1] == 0x80;

    } else {

        return (ch[3] & 0x7f) == 0x7f && ch[2] == 0x80;

    }

}

static inline bool qt_is_nan(float d)

{

    uchar *ch = (uchar *)&d;

    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {

        return (ch[0] & 0x7f) == 0x7f && ch[1] > 0x80;

    } else {

        return (ch[3] & 0x7f) == 0x7f && ch[2] > 0x80;

    }

}

static inline bool qt_is_finite(float d)

{

    uchar *ch = (uchar *)&d;

    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {

        return (ch[0] & 0x7f) != 0x7f || (ch[1] & 0x80) != 0x80;

    } else {

        return (ch[3] & 0x7f) != 0x7f || (ch[2] & 0x80) != 0x80;

    }

}

QT_END_NAMESPACE

#endif // QNUMERIC_P_H