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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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
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