From: Richard Henderson <rth@twiddle.net>
To: Torbjorn Granlund <tg@gmplib.org>
Cc: Blue Swirl <blauwirbel@gmail.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] 3 new x86 instructions
Date: Mon, 14 Jan 2013 10:46:15 -0800 [thread overview]
Message-ID: <50F45277.9070506@twiddle.net> (raw)
In-Reply-To: <86mwwbr5s5.fsf@shell.gmplib.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~
next prev parent reply other threads:[~2013-01-14 18:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-10 13:46 [Qemu-devel] 3 new x86 instructions Torbjorn Granlund
2013-01-12 11:40 ` Blue Swirl
2013-01-12 15:09 ` Torbjorn Granlund
2013-01-12 19:02 ` Richard Henderson
2013-01-14 18:14 ` Torbjorn Granlund
2013-01-14 18:46 ` Richard Henderson [this message]
2013-01-15 17:14 ` Torbjorn Granlund
2013-01-15 17:17 ` Richard Henderson
2013-01-16 20:38 ` Torbjorn Granlund
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