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Re: [Qemu-devel] [PATCH] tcg: Remove stack protection from helper functi

From: Andi Kleen
Subject: Re: [Qemu-devel] [PATCH] tcg: Remove stack protection from helper functions
Date: Mon, 26 Sep 2011 21:29:37 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux)

Peter Maydell <address@hidden> 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.


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