Provides 16-bit floating point support.

The `qfloat16`

class provides support for half-precision (16-bit) floating point data. 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.

Note

On x86 and x86-64 that to get hardware accelerated conversions you must compile with F16C or AVX2 enabled, or use `qFloatToFloat16()`

and `qFloatFromFloat16()`

which will detect F16C at runtime.

Returns a qfloat16 with the sign of `sign`

but the rest of its value taken from this qfloat16. Serves as qfloat16’s equivalent of std::copysign().

Returns `true`

if this `qfloat16`

value is finite and in normal form.

See also

`qFpClassify()`

Converts `len`

qfloat16 from `in`

to floats and stores them in `out`

. Both `in`

and `out`

must have `len`

allocated entries.

This function is faster than converting values one by one, and will do runtime F16C detection on x86 and x86-64 hardware.

Converts `len`

floats from `in`

to qfloat16 and stores them in `out`

. Both `in`

and `out`

must have `len`

allocated entries.

This function is faster than converting values one by one, and will do runtime F16C detection on x86 and x86-64 hardware.

This function overloads `qFpClassify(float)`

.

Returns the floating-point class of `val`

.

This function overloads `qFuzzyCompare(float, float)`

.

Compares the floating point value `p1`

and `p2`

and returns `true`

if they are considered equal, otherwise `false`

.

The two numbers are compared in a relative way, where the exactness is stronger the smaller the numbers are.

This function overloads qIsFinite(float).

Returns true if the `qfloat16`

`f`

is a finite number.

This function overloads qIsInf(float).

Returns true if the `qfloat16`

`f`

is equivalent to infinity.

This function overloads qIsNaN(float).

Returns true if the `qfloat16`

`f`

is not a number (NaN).

This function overloads `qRound(float)`

.

Rounds `value`

to the nearest integer.

This function overloads `qRound64(float)`

.

Rounds `value`

to the nearest 64-bit integer.

Constructs a qfloat16 without initializing the value.

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