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Subject: Re: [Qemu-devel] 3 new x86 instructions
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To: Torbjorn Granlund <tg@gmplib.org>
Cc: Blue Swirl <blauwirbel@gmail.com>, qemu-devel@nongnu.org

On 01/14/2013 10:14 AM, Torbjorn Granlund wrote:
> Is it in such a state that grabbing that repo and building a
> qemu-system-x86_64 would give me MULX support?

Yes, and "-cpu Haswell" will enable the BMI extensions.

A review of the code and docs reveals that I missed RORX
from the BMI2 insns, but that's the only one I missed.

Note that I also incorrectly set the overflow flag in
several of the BMI insns.  It ought to be 0, and I currently
set it as if by a standard arithmetic insn.

I can also suggest using "qemu-x86_64" for userland linux
emulation, rather than full system emulation, for testing
something as well-behaved as gmp.  In partiular, the way
memory accesses are translated is significantly faster.

> I see.  ADCX and ADOX are several years away, IIUC.

Yes, in the Broadwell shrink.


r~