[Bug 278417] The _cvtsh_ss() intrinsic function generates illegal instructions

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278417

Mark Millard <marklmi26-fbsd@yahoo.com> changed:

           What    |Removed                     |Added
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                 CC|                            |marklmi26-fbsd@yahoo.com

--- Comment #1 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
For reference:

static __inline float __DEFAULT_FN_ATTRS128     _cvtsh_ss (unsigned short __a)
        Converts a 16-bit half-precision float value into a 32-bit float value.

Quoting https://en.wikipedia.org/wiki/Half-precision_floating-point_format :

Support for half precision in the x86 instruction set is specified in the F16C
instruction set extension, first introduced in 2009 by AMD and fairly broadly
adopted by AMD and Intel CPUs by 2012. This was further extended up the
AVX-512_FP16 instruction set extension implemented in the Intel Sapphire Rapids
processor.

Quoting https://en.wikipedia.org/wiki/F16C :

The F16C[1] (previously/informally known as CVT16) instruction set is an x86
instruction set architecture extension which provides support for converting
between half-precision and standard IEEE single-precision floating-point
formats.


Is your hardware missing the F16C instruction set extension?

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