> Date: Sun, 18 Feb 2024 09:25:38 +0000
> From: Stuart Henderson <stu@spacehopper.org>
> 
> On 2024/02/17 20:59, Christian Weisgerber wrote:
> > From some cursory grepping, I don't think BLAKE3 is used much if
> > at all in clang.  So I don't know if this buys us anything.  It
> > does not reduce the time required by clang to compile itself.
> 
> Any idea how to make sure that this code is exercised?
> 
> > +.if ${MACHINE_ARCH} == "amd64"
> > +SRCS+=	blake3_sse2_x86-64_unix.S \
> > +	blake3_sse41_x86-64_unix.S \
> > +	blake3_avx2_x86-64_unix.S \
> > +	blake3_avx512_x86-64_unix.S
> > +.endif
> 
> I have a suspicion that AVX512 might not work with OpenBSD.
> We've had a diagnosed problem with this in node, and now a suspected
> one in GHC.

AVX512 doesn't work with OpenBSD.  Code is supposed to check whether
AVX512 has been enabled by the OS (in addition to checking the CPUID
bits).  But I wouldn't be surprised if there is code out there that
just checks the CPUID bits and just assumes the OS has enabled support
if they're present.