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Re: [Pgubook-readers] Type .long
From: |
Roger |
Subject: |
Re: [Pgubook-readers] Type .long |
Date: |
Sat, 11 Jan 2014 01:40:02 -0900 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
> On Sat, Jan 11, 2014 at 10:48:19AM +0300, George Nyoro wrote:
...snip...
> At the offending line, if I replace it with je end, the program works. If
> I leave it as is, the exit status is 0, showing that the program did not
> run even once. The reason I came to understand or diagnose is that the
> value of eol is some value greater than 255 while %edi is, for the start
> of the program after moving the address to it, less than 255. eol is then
> seen as smaller than edi by the value that it overshoots 255 by hence the
> program never runs� through the rest of loop.
>
> Now, my problem is, why? The only part in the book that referenced
> anything like this said that only the exit status is allowed to be less
> than 256. But why do longs overshoot? How then can I ever compute large
> numbers? Unless something is wrong with my code.
>
> Please help, Much appreciated.
Interesting you noted the numeral 255, as some platforms have a limit of
255/256 for hardware addresses/addressing.
"255 (number)"
http://en.wikipedia.org/wiki/255_(number)
I remember this from my Commodore 64 days.
PEEK
http://www.c64-wiki.com/index.php/PEEK
--
Roger
http://rogerx.freeshell.org/