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Document run-time acceleration of using the conversions functions

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Pick-to: 5.15
Change-Id: I985b93135b9d8fdfdd64e9183b23cbf8a7b4e3eb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Allan Sandfeld Jensen 2020-07-29 15:37:28 +02:00
parent 7940851863
commit a57419b10d
1 changed files with 10 additions and 0 deletions
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10
src/corelib/global/qfloat16.cpp
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@ -65,6 +65,10 @@ QT_BEGIN_NAMESPACE
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.
\since 5.9
*/
@ -262,6 +266,9 @@ static void qFloatFromFloat16_fast(float *, const quint16 *, qsizetype) noexcept
Converts \a len floats from \a in to qfloat16 and stores them in \a out.
Both \a in and \a out must have \a 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.
*/
Q_CORE_EXPORT void qFloatToFloat16(qfloat16 *out, const float *in, qsizetype len) noexcept
{
@ -278,6 +285,9 @@ Q_CORE_EXPORT void qFloatToFloat16(qfloat16 *out, const float *in, qsizetype len
Converts \a len qfloat16 from \a in to floats and stores them in \a out.
Both \a in and \a out must have \a 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.
*/
Q_CORE_EXPORT void qFloatFromFloat16(float *out, const qfloat16 *in, qsizetype len) noexcept
{