Header 16-bit Floating Point Support
(<QFloat16> - 16-bit Floating Point Support)The <QFloat16> header file provides 16-bit floating point support. More...
Header: | #include < |
Since: | Qt 5.9 |
This documentation was introduced in Qt 5.9.
Functions
void | qFloatFromFloat16(float *out, const qfloat16 *in, qsizetype len) |
void | qFloatToFloat16(qfloat16 *out, const float *in, qsizetype len) |
bool | qIsFinite(qfloat16 f) |
bool | qIsInf(qfloat16 f) |
bool | qIsNaN(qfloat16 f) |
Detailed Description
This header file provides support for half-precision (16-bit) floating point data with the class qfloat16
. It is fully compliant with IEEE 754 as a storage type. This implies that any arithmetic operation on a qfloat16
instance results in the value first being converted to a float
. This conversion to and from float
is performed by hardware when possible, but on processors that do not natively support half-precision, the conversion is performed through a sequence of lookup table operations.
qfloat16
should be treated as if it were a POD (plain old data) type. Consequently, none of the supported operations need any elaboration beyond stating that it supports all arithmetic operators incident to floating point types.
Function Documentation
void <QFloat16>::qFloatFromFloat16(float *out, const qfloat16 *in, qsizetype len)
Converts len qfloat16 from in to floats and stores them in out. Both in and out must have len allocated entries.
This function was introduced in Qt 5.11.
void <QFloat16>::qFloatToFloat16(qfloat16 *out, const float *in, qsizetype len)
Converts len floats from in to qfloat16 and stores them in out. Both in and out must have len allocated entries.
This function was introduced in Qt 5.11.
bool <QFloat16>::qIsFinite(qfloat16 f)
Returns true if the qfloat16
f is a finite number.
See also qIsFinite.
bool <QFloat16>::qIsInf(qfloat16 f)
Returns true if the qfloat16
f is equivalent to infinity.
See also qIsInf.
bool <QFloat16>::qIsNaN(qfloat16 f)
Returns true if the qfloat16
f is not a number (NaN).
See also qIsNaN.