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Matjaz Breskvar schrieb:

This
l.addi  r2,r0,-4
and this 
l.movhi r2,hi(0xfffffffc)
l.ori   r2,lo(0xfffffffc)

produces exactly the same result (r2). :-)

regards,
Damjan

----- Original Message ----- 
From: "Patrick Loschmidt" <Patrick.Loschmidt@o...>
To: "List about OpenRISC project" <openrisc@o...>
Sent: Thursday, December 30, 2004 4:36 PM
Subject: Re: [openrisc] Bug in hello-uart

> Matjaz Breskvar schrieb:
>>> _reset:
>>>         l.movhi r1,hi(_stack-4)
>>>         l.ori   r1,r1,lo(_stack-4)
>>>-        l.addi  r2,r0,-3
>>>+        l.addi  r2,r0,-4
>>>         l.and   r1,r1,r2
>>>
>>>         l.movhi r2,hi(_main)
>>>I suppose that the -3 should do an alignment to 32bit words but this is 
>>>not the case. Because -3 is b1101 or 0xD so it should be -4 equal to 
>>>b1100 or 0xC. Could somebody please confirm this?
>> it's readibility bug in any case. Since this is an example, let's do
>> it really clearly:
>> 
>> l.movhi r2,hi(0xfffffffc)
>> l.ori   r2,lo(0xfffffffc)
>> 
>> and now there is no confusion anymore.
> 
> I found the example very usefull for my own start-up code, so I'm not 
> sure whether changing it to fixed addresses is a good idea, but I leave 
> it up to the maintainer ... ;-)
> 
> Regards,
> Patrick
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