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Re: [Qemu-devel] [PATCH 0/8] tcg/interpreter: Add TCG + interpreter for

From: Blue Swirl
Subject: Re: [Qemu-devel] [PATCH 0/8] tcg/interpreter: Add TCG + interpreter for bytecode (virtual machine)
Date: Sun, 18 Sep 2011 10:26:56 +0000

On Sat, Sep 17, 2011 at 7:59 PM, Stefan Weil <address@hidden> wrote:
> Hello,
> these patches add a new code generator (TCG target) to qemu.
> Unlike other tcg target code generators, this one does not generate
> machine code for some cpu. It generates machine independent bytecode
> which is interpreted later. That's why I called it TCI (tiny code
> interpreter).
> I wrote most of the code two years ago and included feedback and
> contributions from several QEMU developers, notably TeleMan,
> Stuart Brady, Blue Swirl and Malc. See the history here:
> http://lists.nongnu.org/archive/html/qemu-devel/2009-09/msg01710.html
> Since that time, I used TCI regularly, added small fixes and improvements
> and rebased it to latest QEMU. Some versions were tested using
> ARM (emulated and real), PowerPC (emulated) and MIPS (emulated) hosts,
> but normally I run it on i386 and x86_64 hosts.
> I'd appreciate to see TCI in QEMU 1.0.
> Regards,
> Stefan Weil
> The patches 2 and 4 are optional, patch 8 is only needed for running
> TCI on a PowerPC host.

I think patches 1 to 4 and 8 could be applied soon as they are now,
they should benefit plain TCG too. I had some comments to other
patches, but otherwise everything looks great.

Comparisons to other bytecode interpreters (for example Python) would
be interesting, maybe there are also tricks that can be reused.

> [PATCH 1/8] tcg: Declare TCG_TARGET_REG_BITS in tcg.h
> [PATCH 2/8] tcg: Don't declare TCG_TARGET_REG_BITS in tcg-target.h
> [PATCH 3/8] tcg: Add forward declarations for local functions
> [PATCH 4/8] tcg: Add some assertions
> [PATCH 5/8] tcg: Add interpreter for bytecode
> [PATCH 6/8] tcg: Add bytecode generator for tcg interpreter
> [PATCH 7/8] tcg: Add tcg interpreter to configure / make
> [PATCH 8/8] ppc: Support tcg interpreter on ppc hosts

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