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From: Richard Henderson <rth@twiddle.net>
To: Avi Kivity <avi@redhat.com>
Cc: Laurent Desnogues <laurent.desnogues@gmail.com>,
	Jan Kiszka <jan.kiszka@siemens.com>,
	Mulyadi Santosa <mulyadi.santosa@gmail.com>,
	qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH] tcg: Remove stack protection from helper functions
Date: Mon, 26 Sep 2011 12:43:43 -0700	[thread overview]
Message-ID: <4E80D5EF.4090705@twiddle.net> (raw)
In-Reply-To: <4E80B944.4040209@redhat.com>

On 09/26/2011 10:41 AM, Avi Kivity wrote:
> Native tcg ops for common vector instructions would probably be quite a speedup.

It's very possible to simply open-code many of the vector operations.

I've done a port of qemu to the SPU (aka Cell) processor.  This core
has no scalar operations; all operations are on vectors.  It turned
out fairly well for the basic arithmetic.  I only have to fall back
on helpers for the more esoteric operations.

That said, all FP vector operations should of course continue to be
done completely via helpers, since one would need helpers for the
individual FP operations anyway.


r~

  reply	other threads:[~2011-09-26 19:43 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-26  7:46 [Qemu-devel] [PATCH] tcg: Remove stack protection from helper functions Jan Kiszka
2011-09-26  8:01 ` Mulyadi Santosa
2011-09-26  8:15   ` Laurent Desnogues
2011-09-26 17:41     ` Avi Kivity
2011-09-26 19:43       ` Richard Henderson [this message]
2011-09-26 19:52         ` Avi Kivity
2011-09-26 19:53           ` Richard Henderson
2011-09-26 20:20             ` Avi Kivity
2011-09-26 20:19           ` Peter Maydell
2011-09-26 20:26             ` Avi Kivity
2011-09-27  4:29             ` Andi Kleen
2011-09-27  7:58               ` Peter Maydell
2011-09-26 10:51 ` [Qemu-devel] [PATCH v2] " Jan Kiszka
2011-09-26 11:33   ` Peter Maydell
2011-09-26 11:43     ` Jan Kiszka
2011-09-26 11:56       ` Peter Maydell
2011-09-26 17:22         ` Blue Swirl
2011-09-26 17:33           ` Jan Kiszka
2011-09-26 18:20             ` Blue Swirl
2011-09-26 18:25               ` Jan Kiszka
2011-09-26 18:40                 ` Blue Swirl
2011-09-26 19:08               ` Peter Maydell

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