| /**************************************************************************** |
| ** |
| ** Copyright (C) 2015 The Qt Company Ltd. |
| ** Contact: http://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtCore module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL21$ |
| ** Commercial License Usage |
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| ** accordance with the commercial license agreement provided with the |
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| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
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| ** Software Foundation and appearing in the file LICENSE.LGPLv21 and |
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| ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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| ** |
| ****************************************************************************/ |
| |
| #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 inline double qt_inf() |
| { |
| return (QSysInfo::ByteOrder == QSysInfo::BigEndian |
| ? qt_be_inf_bytes.d |
| : qt_le_inf_bytes.d); |
| } |
| |
| // 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 inline double qt_snan() |
| { |
| return (QSysInfo::ByteOrder == QSysInfo::BigEndian |
| ? qt_be_snan_bytes.d |
| : qt_le_snan_bytes.d); |
| } |
| |
| // 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 inline double qt_qnan() |
| { |
| return (QSysInfo::ByteOrder == QSysInfo::BigEndian |
| ? qt_be_qnan_bytes.d |
| : qt_le_qnan_bytes.d); |
| } |
| |
| #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 inline double qt_inf() |
| { |
| const unsigned char *bytes; |
| bytes = (QSysInfo::ByteOrder == QSysInfo::BigEndian |
| ? qt_be_inf_bytes |
| : qt_le_inf_bytes); |
| |
| union { unsigned char c[8]; double d; } returnValue; |
| memcpy(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 inline double qt_snan() |
| { |
| const unsigned char *bytes; |
| bytes = (QSysInfo::ByteOrder == QSysInfo::BigEndian |
| ? qt_be_snan_bytes |
| : qt_le_snan_bytes); |
| |
| union { unsigned char c[8]; double d; } returnValue; |
| memcpy(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 inline double qt_qnan() |
| { |
| const unsigned char *bytes; |
| bytes = (QSysInfo::ByteOrder == QSysInfo::BigEndian |
| ? qt_be_qnan_bytes |
| : qt_le_qnan_bytes); |
| |
| union { unsigned char c[8]; double d; } returnValue; |
| memcpy(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; |
| if (QSysInfo::ByteOrder == QSysInfo::BigEndian) { |
| return (ch[0] & 0x7f) == 0x7f && ch[1] == 0xf0; |
| } else { |
| return (ch[7] & 0x7f) == 0x7f && ch[6] == 0xf0; |
| } |
| } |
| |
| static inline bool qt_is_nan(double d) |
| { |
| uchar *ch = (uchar *)&d; |
| if (QSysInfo::ByteOrder == QSysInfo::BigEndian) { |
| return (ch[0] & 0x7f) == 0x7f && ch[1] > 0xf0; |
| } else { |
| return (ch[7] & 0x7f) == 0x7f && ch[6] > 0xf0; |
| } |
| } |
| |
| static inline bool qt_is_finite(double d) |
| { |
| uchar *ch = (uchar *)&d; |
| if (QSysInfo::ByteOrder == QSysInfo::BigEndian) { |
| return (ch[0] & 0x7f) != 0x7f || (ch[1] & 0xf0) != 0xf0; |
| } else { |
| return (ch[7] & 0x7f) != 0x7f || (ch[6] & 0xf0) != 0xf0; |
| } |
| } |
| |
| 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 |