[Issue 19861] core.cpuid reports the wrong number of threads

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19861

--- Comment #5 from Илья Ярошенко <ilyayaroshenko at gmail.com> ---
(In reply to Rainer Schuetze from comment #3)
> I shortly tried it on an AMD Ryzen 8-core, and it failed, too (reported 16
> cores, but 1 thread). Debugging it a bit showed that there is probably
> incomplete support for CPUID#8000_0008:
> https://www.amd.com/system/files/TechDocs/54945_PPR_Family_17h_Models_00h-
> 0Fh.pdf or
> https://wiki.osdev.org/Detecting_CPU_Topology_(80x86)#AMD:_CPUID_eax.
> 3D0x80000008
> 
> I didn't try mir-cpuid, but looking at the source code now, I don't see any
> use of that CPUID function, so it probably won't work, too.

CPUID#8000_0008 has been added.
https://github.com/libmir/mir-cpuid/pull/41

Rainer Schuetze, could you please check if it works now.

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