From: Christian MICHON <christian.michon@gmail.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] x86 FPU Emulation
Date: Mon, 18 Jul 2005 09:58:07 +0200 [thread overview]
Message-ID: <46d6db6605071800583fffb0f1@mail.gmail.com> (raw)
In-Reply-To: <BAY101-F471FBC2CF0ECA646E9F5ACCD20@phx.gbl>
I see the same problems on bartpe (XP winpe compatible).
By the way, on XP (guest or host), you need to type
calc387 2^^4.
But I've tested other software, notably 3D images raytracers,
using FP operations. No such problems. Images look good.
Yet I guess I should do a pixel per pixel comparison to
check any truncation.
Another possibility would be to compile the asm of calc387
on linux to check the values.
Christian
On 7/17/05, The Qube <qube99@hotmail.com> wrote:
> Using any DOS/DOS-like setup under qemu x86 (no kqemu/qvm86) and running
> calc387 will produce non-sane results. For example, "calc387 2^4" produces
> 17.7635. "calc387 4^2" produces 17.7635 as well. I've verified this is not
> an issue with calc387 by running the above two calculations under dosbox
> 0.63 with the dynamic core and geting "16" back for both.. I've test this
> on an Athlon XP system. runcom doesn't work with calc387, so qemu-i386
> isn't testable.
>
> calc387's homepage (near the bottom): http://www.geocities.com/craig_hessel/
>
>
>
>
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel
>
--
Christian
prev parent reply other threads:[~2005-07-18 8:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-17 21:37 [Qemu-devel] x86 FPU Emulation The Qube
2005-07-18 7:58 ` Christian MICHON [this message]
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