Re: [Qemu-devel] x86 FPU Emulation

[Christian MICHON]

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 <address@hidden> 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/
> 
> 
> 
> 
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-- 
Christian