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Diffstat (limited to 'src/corelib/global/qnumeric_p.h')
-rw-r--r-- | src/corelib/global/qnumeric_p.h | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/src/corelib/global/qnumeric_p.h b/src/corelib/global/qnumeric_p.h new file mode 100644 index 0000000000..d4aa6587f3 --- /dev/null +++ b/src/corelib/global/qnumeric_p.h @@ -0,0 +1,243 @@ +/**************************************************************************** +** +** Copyright (C) 2011 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 |