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Re: [Qemu-devel] [PATCH] ppc32 guests: fix computation of XER.{CA, OV} i
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH] ppc32 guests: fix computation of XER.{CA, OV} in addme, subfme, mullwo |
Date: |
Wed, 1 Oct 2008 23:47:21 +0200 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Sun, May 11, 2008 at 02:04:47AM +0200, Julian Seward wrote:
>
> For ppc32 guests, computation of XER.CA and XER.OV in some obscure
> cases is incorrect. At least, it doesn't produce the same results
> as a real MPC7447, and doesn't appear to be in accordance with the
> instruction set documentation.
>
> The attached patch fixes it:
>
> * addme{o}{.}, subfme{o}{.}: compute XER.CA correctly
>
> * mullwo{.}: sign extend arguments before doing 64-bit
> multiply, so as to make the XER.OV computation correct
>
I fixed both problems by applying a mix of your patch and of the patch
from Jocelyn Mayer.
--
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
: :' : Debian developer | Electrical Engineer
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