From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1MsLBW-0005ht-F9
	for qemu-devel@nongnu.org; Mon, 28 Sep 2009 14:42:54 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1MsLBR-0005bV-PK
	for qemu-devel@nongnu.org; Mon, 28 Sep 2009 14:42:54 -0400
Received: from [199.232.76.173] (port=40331 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1MsLBR-0005bI-KZ
	for qemu-devel@nongnu.org; Mon, 28 Sep 2009 14:42:49 -0400
Received: from mail-bw0-f211.google.com ([209.85.218.211]:35812)
	by monty-python.gnu.org with esmtp (Exim 4.60)
	(envelope-from <blauwirbel@gmail.com>) id 1MsLBQ-00023P-LA
	for qemu-devel@nongnu.org; Mon, 28 Sep 2009 14:42:48 -0400
Received: by bwz7 with SMTP id 7so510555bwz.34
	for <qemu-devel@nongnu.org>; Mon, 28 Sep 2009 11:42:47 -0700 (PDT)
MIME-Version: 1.0
In-Reply-To: <1254156621-28559-1-git-send-email-weil@mail.berlios.de>
References: <4AC0E93A.6010605@mail.berlios.de>
	<1254156621-28559-1-git-send-email-weil@mail.berlios.de>
From: Blue Swirl <blauwirbel@gmail.com>
Date: Mon, 28 Sep 2009 21:42:27 +0300
Message-ID: <f43fc5580909281142i6d8f8541id1917ee31bfc3f6f@mail.gmail.com>
Subject: Re: [Qemu-devel] [PATCH] tcg, tci: Add TCG and interpreter for
	bytecode (virtual machine)
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Stefan Weil <weil@mail.berlios.de>
Cc: QEMU Developers <qemu-devel@nongnu.org>, Stefan Weil <stefan@mail.berlios.de>

On Mon, Sep 28, 2009 at 7:50 PM, Stefan Weil <weil@mail.berlios.de> wrote:
> This is an initial and highly experimental version of
> a new code generator which does not create native code
> (so it will not depend on the host running qemu when it
> is finished). It creates bytecode which is interpreted.
>
> The current version can run the bios code, a simple
> hello world and the linux-user testcode for the
> i386 and x86_64 targets on x86_64 hosts.
>
> Some additional information is in tcg/bytecode/README
> which is part of the patch.
>
> Please send patches / enhancements based on my latest
> version from git://repo.or.cz/qemu/ar7.git.

Nice. When the interpreter works, it should be unconditional for
targets that are not supported by TCG.

> +QEMU can create native code for some hosts (arm, hppa, i386, ppc, ppc64,
> +sparc, x86_64). For others, inoffical host support was written (s390).

unofficial

> +static const int tcg_target_call_oarg_regs[2] =3D {
> + =C2=A0 =C2=A0// TODO: ppc64 only uses one register. Why do others use t=
wo?

To pass a 64 bit return value in two 32 bit registers?

> +static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] =3D {

> +#if TCG_TARGET_NB_REGS =3D=3D 16 || TCG_TARGET_NB_REGS =3D=3D 32

> + =C2=A0 =C2=A0"r16",

Table overflow.