[Bug 223014] graphics/mesa-dri: enable NEON and AltiVec

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223014

--- Comment #15 from Piotr Kubaj <pkubaj at FreeBSD.org> ---
(In reply to Jan Beich from comment #14)
I didn't get it to work. It fails because of broken tests from drm-kmod, which
disable acceleration. To make it work, kernel needs to be fixed first, only
then Mesa will work.

There is talk on #powerpc64 that mmacy@ got it to work about a year ago, using
his fork of FreeBSD (POWER9BSD), on older Radeon GPU. I also use POWER9 (but on
vanilla FreeBSD) and can report that it doesn't work currently.

jhibbits said he got it to work using his Amiga X5000, but it uses a very
different chip. It uses NXP's embedded ppc64 chips (very nonstandard and seldom
used), while POWER9 is the mainstream one (designed by IBM). NXP chips use
other code in FreeBSD's kernel, so this may be why it worked.

Nevertheless, NXP chips don't have AltiVec support so this patch won't help it.

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