From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:56790)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <janne@jannau.net>) id 1WLamL-00045h-93
	for qemu-devel@nongnu.org; Thu, 06 Mar 2014 11:04:19 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <janne@jannau.net>) id 1WLamG-0001Bh-SN
	for qemu-devel@nongnu.org; Thu, 06 Mar 2014 11:04:13 -0500
Received: from soltyk.jannau.net ([185.27.253.110]:43891)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <janne@jannau.net>) id 1WLamG-0001BR-MQ
	for qemu-devel@nongnu.org; Thu, 06 Mar 2014 11:04:08 -0500
Date: Thu, 6 Mar 2014 17:04:05 +0100
From: Janne Grunau <j@jannau.net>
Message-ID: <20140306160404.GO20660@jannau.net>
References: <87sirhyi1b.fsf@linaro.org> <20140224130117.GC6747@jannau.net>
	<87fvn7mblu.fsf@linaro.org> <20140225171103.GB20660@jannau.net>
	<8738ivd074.fsf@linaro.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
In-Reply-To: <8738ivd074.fsf@linaro.org>
Content-Transfer-Encoding: quoted-printable
Subject: Re: [Qemu-devel] Call for testing QEMU aarch64-linux-user emulation
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Alex =?iso-8859-1?Q?Benn=E9e?= <alex.bennee@linaro.org>
Cc: Peter Maydell <peter.maydell@linaro.org>, linaro-dev <linaro-dev@lists.linaro.org>, Michael Matz <matz@suse.de>, Alexander Graf <agraf@suse.de>, "linaro-toolchain@lists.linaro.org" <linaro-toolchain@lists.linaro.org>, qemu-devel <qemu-devel@nongnu.org>, Wook Wookey <wookey@linaro.org>, Christoffer Dall <Christoffer.Dall@linaro.org>

On 2014-03-06 11:40:47 +0000, Alex Benn=E9e wrote:
>=20
> Janne Grunau <j@jannau.net> writes:
>=20
> > On 2014-02-25 15:54:37 +0000, Alex Benn=E9e wrote:
> >>
> <snip>
> >> Have you got the log file "unsupported" line? I seem to recall you d=
id
> >> ping me but maybe it was just on IRC? I just want to make sure I
> >> do the right ones. I'm working on this now.
> >
> > We spoke on irc about it. a quick test commenting unsupported
> > instructions out revealed that rshrn/2, sqrshrun and shrn/2 are
> > the only NEON instructions used in libav still missing support
> > in qemu master. Unsoppurted lines from qemu master 0459650d94d1
> > below.
> >
> > target-arm/translate-a64.c:6884: unsupported instruction encoding 0x0=
f0a8e10 at pc=3D00000000008632c8
> > target-arm/translate-a64.c:6884: unsupported instruction encoding 0x2=
f0b8f9c at pc=3D0000000000865764
> > target-arm/translate-a64.c:6884: unsupported instruction encoding 0x0=
f0a8610 at pc=3D0000000000863afc
>=20
> I've just pushed support for the various shrn opcodes to:
>=20
> https://github.com/stsquad/qemu/tree/ajb-a64-working

Thanks, just testing it and it seems to work as expected.

> I suspect if libav uses them heavily there could be some optimisation
> to be made as the narrow operations make heavy use of helpers to do the
> saturation stuff.

The saturating shift is not that heavily used and I don't care much as
long as qemu is an order of magnitude faster than ARM's foundation model
and much easier to handle than Apple hardware.

Janne