Re: [openrisc] xori instruction

["Damjan Lampret" <lampret@opencores.org>]

Maria,

in the new arch manual version 1.0 I used or1k_isadesc.h file that you have
provided to me. I can't remember right now what or1ksim does, it might sign
extend if I remember correctly (but not sure!). Anyway l.xori description in
compiler sign extends immediate. So or1200 RTL will properly executed
compiler generated code. Can you check what or1ksim does?

regards,
Damjan

----- Original Message -----
From: "Marķa Bolado" <mbolado@teisa.unican.es>
To: <openrisc@opencores.org>
Sent: Friday, January 31, 2003 2:09 PM
Subject: [openrisc] xori instruction


> Hi!
> I have noted that there is a possible error with xori instruction.
> According to OR100 Manual of 28/May/2001 (old) the immediate must be
> zero-extended (if you look at 'description' section of the page) or
> sign-extended (if you look at 'implementation' section of the page).
> In the next version of the manual the inconsistency seems to be
subsanated, as
> it says that the immediate must be zero-extended (in both 'description'
and
> 'implementation'). However, OR1200 RTL extends the sign of the immediate.
> I guess that the correct option is sign-extending, as OR1200 is the golden
> reference but, could you please confirm that point?
>
> Thanks in advance
>
> Marķa Bolado
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