On Fri, 28 Jan 2000, Alan Modra wrote:
>
> On Thu, 27 Jan 2000, Richard B. Johnson wrote:
>
> > Well! We went over this two years ago. The problem is that segment
> > overrides are specifically excluded for the LODS, LODSB, LODSW, and
> > LODSD instructions on the '486. (Page 16-203, Intel Rag called
> > Intel 486 Microprocessor Family, Programmer's Reference Manual).
>
> Did you mean the discussion you and I had? That was about OUTS, not LODS.
> You showed by running code on various machines that newer Intel cpus
> don't support a segment override on OUTS while older ones do. I was
> rather surprised, especially since older Intel documentation said a
> segment override was supported for OUTS. Newer PIII docs say it isn't.
>
> Quoting from your old mail
> > Here are some results:
> >
> > This was a pentium called 'Klamath'
> >
> > Data with no override = 55 (should be 55)
> > Data with ES override = AA (should be AA)
> > Data with CS override = CC (should be CC)
> > Data with SS override = BB (should be BB)
> >
> > This was a pentium called 'Deschutes'
> >
> > Data with no override = 55 (should be 55)
> > Data with ES override = 55 (should be AA)
> > Data with CS override = 55 (should be CC)
> > Data with SS override = 55 (should be BB)
> >
> > This is a '486 DX/66'
> >
> > Data with no override = 55 (should be 55)
> > Data with ES override = AA (should be AA)
> > Data with CS override = CC (should be CC)
> > Data with SS override = BB (should be BB)
>
There were discussions now only about OUTS with you, but also other
string operations as well, to/from others.
Cheers,
Dick Johnson
Penguin : Linux version 2.3.39 on an i686 machine (800.63 BogoMips).
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