Re: port-amd64/52966 (amd64 FPU handling broken on AMD)

[maxv%NetBSD.org@localhost]

Synopsis: amd64 FPU handling broken on AMD

State-Changed-From-To: open->feedback
State-Changed-By: maxv%NetBSD.org@localhost
State-Changed-When: Mon, 06 Aug 2018 13:06:58 +0000
State-Changed-Why:
I don't see where the problem is. I had added XSAVEOPT after following the
Intel spec, and everything worked fine back then. Today it still works
fine on my Intel hardware, with and without EagerFPU (I have tested your
"stream" program, repeatedly, I always get "solution validates").

It may be a Ryzen CPU bug. So can you:

 * Update the BIOS of your motherboard. Make sure you have the latest
   version. Then re-test. If there's still a problem:

 * Disable SMT in your BIOS, and re-test. Maybe it is an SMT-related
   problem.

Once this is done, and if there is still an issue, we'll have to dig
deeper.