mirror of https://github.com/qt/qtbase.git
259 lines
9.6 KiB
C++
259 lines
9.6 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2016 by Southwest Research Institute (R)
|
|
** Contact: http://www.qt-project.org/legal
|
|
**
|
|
** This file is part of the QtCore module of the Qt Toolkit.
|
|
**
|
|
** $QT_BEGIN_LICENSE:LGPL$
|
|
** Commercial License Usage
|
|
** Licensees holding valid commercial Qt licenses may use this file in
|
|
** accordance with the commercial license agreement provided with the
|
|
** Software or, alternatively, in accordance with the terms contained in
|
|
** a written agreement between you and The Qt Company. For licensing terms
|
|
** and conditions see https://www.qt.io/terms-conditions. For further
|
|
** information use the contact form at https://www.qt.io/contact-us.
|
|
**
|
|
** GNU Lesser General Public License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU Lesser
|
|
** General Public License version 3 as published by the Free Software
|
|
** Foundation and appearing in the file LICENSE.LGPL3 included in the
|
|
** packaging of this file. Please review the following information to
|
|
** ensure the GNU Lesser General Public License version 3 requirements
|
|
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
|
|
**
|
|
** GNU General Public License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU
|
|
** General Public License version 2.0 or (at your option) the GNU General
|
|
** Public license version 3 or any later version approved by the KDE Free
|
|
** Qt Foundation. The licenses are as published by the Free Software
|
|
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
|
|
** included in the packaging of this file. Please review the following
|
|
** information to ensure the GNU General Public License requirements will
|
|
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
|
|
** https://www.gnu.org/licenses/gpl-3.0.html.
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
#ifndef QFLOAT16_H
|
|
#define QFLOAT16_H
|
|
|
|
#include <QtCore/qglobal.h>
|
|
#include <QtCore/qmetatype.h>
|
|
#include <string.h>
|
|
|
|
#if defined __F16C__
|
|
#include <immintrin.h>
|
|
#endif
|
|
|
|
QT_BEGIN_NAMESPACE
|
|
|
|
#if 0
|
|
#pragma qt_class(QFloat16)
|
|
#pragma qt_no_master_include
|
|
#endif
|
|
|
|
class qfloat16
|
|
{
|
|
public:
|
|
#ifndef Q_QDOC
|
|
Q_DECL_CONSTEXPR inline qfloat16() Q_DECL_NOTHROW : b16(0) { }
|
|
inline qfloat16(float f) Q_DECL_NOTHROW;
|
|
inline operator float() const Q_DECL_NOTHROW;
|
|
inline operator double() const Q_DECL_NOTHROW;
|
|
inline operator long double() const Q_DECL_NOTHROW;
|
|
#endif
|
|
|
|
private:
|
|
quint16 b16;
|
|
|
|
Q_CORE_EXPORT static const quint32 mantissatable[];
|
|
Q_CORE_EXPORT static const quint32 exponenttable[];
|
|
Q_CORE_EXPORT static const quint32 offsettable[];
|
|
Q_CORE_EXPORT static const quint32 basetable[];
|
|
Q_CORE_EXPORT static const quint32 shifttable[];
|
|
|
|
friend bool qIsNull(qfloat16 f) Q_DECL_NOTHROW;
|
|
friend qfloat16 operator-(qfloat16 a) Q_DECL_NOTHROW;
|
|
};
|
|
|
|
Q_DECLARE_TYPEINFO(qfloat16, Q_PRIMITIVE_TYPE);
|
|
|
|
Q_CORE_EXPORT Q_REQUIRED_RESULT bool qIsInf(qfloat16 f) Q_DECL_NOTHROW; // complements qnumeric.h
|
|
Q_CORE_EXPORT Q_REQUIRED_RESULT bool qIsNaN(qfloat16 f) Q_DECL_NOTHROW; // complements qnumeric.h
|
|
Q_CORE_EXPORT Q_REQUIRED_RESULT bool qIsFinite(qfloat16 f) Q_DECL_NOTHROW; // complements qnumeric.h
|
|
|
|
// The remainder of these utility functions complement qglobal.h
|
|
inline Q_REQUIRED_RESULT int qRound(qfloat16 d) Q_DECL_NOTHROW
|
|
{ return qRound(static_cast<float>(d)); }
|
|
|
|
inline Q_REQUIRED_RESULT qint64 qRound64(qfloat16 d) Q_DECL_NOTHROW
|
|
{ return qRound64(static_cast<float>(d)); }
|
|
|
|
inline Q_REQUIRED_RESULT bool qFuzzyCompare(qfloat16 p1, qfloat16 p2) Q_DECL_NOTHROW
|
|
{
|
|
float f1 = static_cast<float>(p1);
|
|
float f2 = static_cast<float>(p2);
|
|
// The significand precision for IEEE754 half precision is
|
|
// 11 bits (10 explicitly stored), or approximately 3 decimal
|
|
// digits. In selecting the fuzzy comparison factor of 102.5f
|
|
// (that is, (2^10+1)/10) below, we effectively select a
|
|
// window of about 1 (least significant) decimal digit about
|
|
// which the two operands can vary and still return true.
|
|
return (qAbs(f1 - f2) * 102.5f <= qMin(qAbs(f1), qAbs(f2)));
|
|
}
|
|
|
|
inline Q_REQUIRED_RESULT bool qIsNull(qfloat16 f) Q_DECL_NOTHROW
|
|
{
|
|
return (f.b16 & static_cast<quint16>(0x7fff)) == 0;
|
|
}
|
|
|
|
inline int qIntCast(qfloat16 f) Q_DECL_NOTHROW
|
|
{ return int(static_cast<float>(f)); }
|
|
|
|
QT_WARNING_PUSH
|
|
QT_WARNING_DISABLE_CLANG("-Wc99-extensions")
|
|
inline qfloat16::qfloat16(float f) Q_DECL_NOTHROW
|
|
{
|
|
#if defined(QT_COMPILER_SUPPORTS_F16C) && defined(__F16C__)
|
|
__m128 packsingle = _mm_set_ss(f);
|
|
__m128i packhalf = _mm_cvtps_ph(packsingle, 0);
|
|
b16 = _mm_extract_epi16(packhalf, 0);
|
|
#elif defined (__ARM_FP16_FORMAT_IEEE)
|
|
__fp16 f16 = f;
|
|
memcpy(&b16, &f16, sizeof(quint16));
|
|
#else
|
|
quint32 u;
|
|
memcpy(&u, &f, sizeof(quint32));
|
|
b16 = basetable[(u >> 23) & 0x1ff]
|
|
+ ((u & 0x007fffff) >> shifttable[(u >> 23) & 0x1ff]);
|
|
#endif
|
|
}
|
|
QT_WARNING_POP
|
|
|
|
inline qfloat16::operator float() const Q_DECL_NOTHROW
|
|
{
|
|
#if defined(QT_COMPILER_SUPPORTS_F16C) && defined(__F16C__)
|
|
__m128i packhalf = _mm_cvtsi32_si128(b16);
|
|
__m128 packsingle = _mm_cvtph_ps(packhalf);
|
|
return _mm_cvtss_f32(packsingle);
|
|
#elif defined (__ARM_FP16_FORMAT_IEEE)
|
|
__fp16 f16;
|
|
memcpy(&f16, &b16, sizeof(quint16));
|
|
return f16;
|
|
#else
|
|
quint32 u = mantissatable[offsettable[b16 >> 10] + (b16 & 0x3ff)]
|
|
+ exponenttable[b16 >> 10];
|
|
float f;
|
|
memcpy(&f, &u, sizeof(quint32));
|
|
return f;
|
|
#endif
|
|
}
|
|
|
|
inline qfloat16::operator double() const Q_DECL_NOTHROW
|
|
{
|
|
return static_cast<double>(float(*this));
|
|
}
|
|
|
|
inline qfloat16::operator long double() const Q_DECL_NOTHROW
|
|
{
|
|
return static_cast<long double>(float(*this));
|
|
}
|
|
|
|
inline qfloat16 operator-(qfloat16 a) Q_DECL_NOTHROW
|
|
{
|
|
qfloat16 f;
|
|
f.b16 = a.b16 ^ quint16(0x8000);
|
|
return f;
|
|
}
|
|
|
|
inline qfloat16 operator+(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return qfloat16(static_cast<float>(a) + static_cast<float>(b)); }
|
|
inline qfloat16 operator-(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return qfloat16(static_cast<float>(a) - static_cast<float>(b)); }
|
|
inline qfloat16 operator*(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return qfloat16(static_cast<float>(a) * static_cast<float>(b)); }
|
|
inline qfloat16 operator/(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return qfloat16(static_cast<float>(a) / static_cast<float>(b)); }
|
|
|
|
#define QF16_MAKE_ARITH_OP_FP(FP, OP) \
|
|
inline FP operator OP(qfloat16 lhs, FP rhs) Q_DECL_NOTHROW { return static_cast<FP>(lhs) OP rhs; } \
|
|
inline FP operator OP(FP lhs, qfloat16 rhs) Q_DECL_NOTHROW { return lhs OP static_cast<FP>(rhs); }
|
|
#define QF16_MAKE_ARITH_OP_EQ_FP(FP, OP_EQ, OP) \
|
|
inline qfloat16& operator OP_EQ(qfloat16& lhs, FP rhs) Q_DECL_NOTHROW { lhs = qfloat16(static_cast<FP>(lhs) OP rhs); return lhs; }
|
|
#define QF16_MAKE_ARITH_OP(FP) \
|
|
QF16_MAKE_ARITH_OP_FP(FP, +) \
|
|
QF16_MAKE_ARITH_OP_FP(FP, -) \
|
|
QF16_MAKE_ARITH_OP_FP(FP, *) \
|
|
QF16_MAKE_ARITH_OP_FP(FP, /) \
|
|
QF16_MAKE_ARITH_OP_EQ_FP(FP, +=, +) \
|
|
QF16_MAKE_ARITH_OP_EQ_FP(FP, -=, -) \
|
|
QF16_MAKE_ARITH_OP_EQ_FP(FP, *=, *) \
|
|
QF16_MAKE_ARITH_OP_EQ_FP(FP, /=, /)
|
|
QF16_MAKE_ARITH_OP(long double)
|
|
QF16_MAKE_ARITH_OP(double)
|
|
QF16_MAKE_ARITH_OP(float)
|
|
#undef QF16_MAKE_ARITH_OP
|
|
#undef QF16_MAKE_ARITH_OP_FP
|
|
|
|
#define QF16_MAKE_ARITH_OP_INT(OP) \
|
|
inline double operator OP(qfloat16 lhs, int rhs) Q_DECL_NOTHROW { return static_cast<double>(lhs) OP rhs; } \
|
|
inline double operator OP(int lhs, qfloat16 rhs) Q_DECL_NOTHROW { return lhs OP static_cast<double>(rhs); }
|
|
QF16_MAKE_ARITH_OP_INT(+)
|
|
QF16_MAKE_ARITH_OP_INT(-)
|
|
QF16_MAKE_ARITH_OP_INT(*)
|
|
QF16_MAKE_ARITH_OP_INT(/)
|
|
#undef QF16_MAKE_ARITH_OP_INT
|
|
|
|
QT_WARNING_PUSH
|
|
QT_WARNING_DISABLE_CLANG("-Wfloat-equal")
|
|
QT_WARNING_DISABLE_GCC("-Wfloat-equal")
|
|
|
|
inline bool operator>(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return static_cast<float>(a) > static_cast<float>(b); }
|
|
inline bool operator<(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return static_cast<float>(a) < static_cast<float>(b); }
|
|
inline bool operator>=(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return static_cast<float>(a) >= static_cast<float>(b); }
|
|
inline bool operator<=(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return static_cast<float>(a) <= static_cast<float>(b); }
|
|
inline bool operator==(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return static_cast<float>(a) == static_cast<float>(b); }
|
|
inline bool operator!=(qfloat16 a, qfloat16 b) Q_DECL_NOTHROW { return static_cast<float>(a) != static_cast<float>(b); }
|
|
|
|
#define QF16_MAKE_BOOL_OP_FP(FP, OP) \
|
|
inline bool operator OP(qfloat16 lhs, FP rhs) Q_DECL_NOTHROW { return static_cast<FP>(lhs) OP rhs; } \
|
|
inline bool operator OP(FP lhs, qfloat16 rhs) Q_DECL_NOTHROW { return lhs OP static_cast<FP>(rhs); }
|
|
#define QF16_MAKE_BOOL_OP(FP) \
|
|
QF16_MAKE_BOOL_OP_FP(FP, <) \
|
|
QF16_MAKE_BOOL_OP_FP(FP, >) \
|
|
QF16_MAKE_BOOL_OP_FP(FP, >=) \
|
|
QF16_MAKE_BOOL_OP_FP(FP, <=) \
|
|
QF16_MAKE_BOOL_OP_FP(FP, ==) \
|
|
QF16_MAKE_BOOL_OP_FP(FP, !=)
|
|
QF16_MAKE_BOOL_OP(long double)
|
|
QF16_MAKE_BOOL_OP(double)
|
|
QF16_MAKE_BOOL_OP(float)
|
|
#undef QF16_MAKE_BOOL_OP
|
|
#undef QF16_MAKE_BOOL_OP_FP
|
|
|
|
#define QF16_MAKE_BOOL_OP_INT(OP) \
|
|
inline bool operator OP(qfloat16 a, int b) Q_DECL_NOTHROW { return static_cast<float>(a) OP b; } \
|
|
inline bool operator OP(int a, qfloat16 b) Q_DECL_NOTHROW { return a OP static_cast<float>(b); }
|
|
QF16_MAKE_BOOL_OP_INT(>)
|
|
QF16_MAKE_BOOL_OP_INT(<)
|
|
QF16_MAKE_BOOL_OP_INT(>=)
|
|
QF16_MAKE_BOOL_OP_INT(<=)
|
|
QF16_MAKE_BOOL_OP_INT(==)
|
|
QF16_MAKE_BOOL_OP_INT(!=)
|
|
#undef QF16_MAKE_BOOL_OP_INT
|
|
|
|
QT_WARNING_POP
|
|
|
|
/*!
|
|
\internal
|
|
*/
|
|
inline Q_REQUIRED_RESULT bool qFuzzyIsNull(qfloat16 f) Q_DECL_NOTHROW
|
|
{
|
|
return qAbs(static_cast<float>(f)) <= 0.001f;
|
|
}
|
|
|
|
QT_END_NAMESPACE
|
|
|
|
Q_DECLARE_METATYPE(qfloat16)
|
|
|
|
#endif // QFLOAT16_H
|