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From: Andi Kleen <andi@firstfloor.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Jan Kiszka <jan.kiszka@siemens.com>,
	qemu-devel <qemu-devel@nongnu.org>, Avi Kivity <avi@redhat.com>,
	Laurent Desnogues <laurent.desnogues@gmail.com>,
	Mulyadi Santosa <mulyadi.santosa@gmail.com>,
	Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH] tcg: Remove stack protection from helper functions
Date: Mon, 26 Sep 2011 21:29:37 -0700	[thread overview]
Message-ID: <m2sjniip5a.fsf@firstfloor.org> (raw)
In-Reply-To: <CAFEAcA-kkobH763sPVs3zbgh6J9LTsJjo5XkEqHC5g3TDwaMMg@mail.gmail.com> (Peter Maydell's message of "Mon, 26 Sep 2011 21:19:15 +0100")

Peter Maydell <peter.maydell@linaro.org> writes:
>
> The answer is that the edge cases basically never match. No CPU
> architecture does handling of NaNs and input denormals and output
> denormals and underflow checks and all the rest of it in exactly
> the same way as anybody else. (In particular x86 is pretty crazy,

Can you clarify this? 

IEEE754 is pretty strict on how all these things are handled
and to my knowledge all serious x86 are fully IEEE compliant.
Or are you refering to the x87 80bits expansion? While useful
that's not used anymore with SSE.

On the other hand qemu is not very good at it, e.g. with x87
it doesn't even pass paranoia.

-Andi

  parent reply	other threads:[~2011-09-27  4:29 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
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 [this message]
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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