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

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH] tcg: Remove stack protection from helper functions
Date: Mon, 26 Sep 2011 22:52:09 +0300
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2

On 09/26/2011 10:43 PM, Richard Henderson wrote:
On 09/26/2011 10:41 AM, Avi Kivity wrote:
>  Native tcg ops for common vector instructions would probably be quite a 

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.

Why do floating point ops need helpers? At least if all the edge cases match? (i.e. NaNs and denormals)

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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