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

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

--- Comment #6 from Dimitry Andric <dim@FreeBSD.org> ---
FWIW, clang defines __F16C__ for the following -march= settings:

alderlake, arrowlake, arrowlake-s, bdver2, bdver3, bdver4, broadwell, btver2,
cannonlake, cascadelake, clearwaterforest, cooperlake, core-avx-i, core-avx2,
emeraldrapids, gracemont, grandridge, graniterapids, graniterapids-d, haswell,
icelake-client, icelake-server, ivybridge, knl, knm, lunarlake, meteorlake,
pantherlake, raptorlake, rocketlake, sapphirerapids, sierraforest, skx,
skylake, skylake-avx512, tigerlake, x86-64-v3, x86-64-v4, znver1, znver2,
znver3, znver4.

I'm unsure if these names correspond exactly to what is in bsd.cpu.mk now.
Also, I don't see much use of the bsd.cpu.mk features in the src tree, but
maybe it is used more often in the ports tree?

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