Re: base,index,scale,disp help
From: Bjarni Juliusson (bjarni.ferret_at_update.ferret.uu.se_remove_the_animal)
Date: 05/21/04
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Date: Fri, 21 May 2004 02:45:40 +0000 (UTC)
v3ct0r99 wrote:
> Hi all,
> how does this work on intel?
>
> On IBM mainframe it's pretty simple and we dont use a 'scale' ...
> eg. LA(load adress):
> LA 11, 4(7,6) ;6 = BASE REG , 7 = INDEX REG ,4 = DISP
> assuming base reg is 100 and index reg is 10 then after
> execution reg 11 = 114 ( base 100 + index 10 + disp 4)
>
> could someone explain the rules for intel?
The address is displacement+base+index*scale. Base and index can be any
general purpose registers on the 80386 and later, unlike the previous
processors.
Bjarni
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