AVR-Chat

Don Kinzer, you know so much!
Even though I'm planning to avoid assembler as much as I can... I'm amazed 
at the level of detail you know.

Thank you!

Cat

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From: "Don Kinzer" <dkinzer@easystreet.net>
Sent: Tuesday, July 29, 2008 5:29 PM
To: <AVR-Chat@yahoogroups.com>
Subject: [AVR-Chat] Re: ASM 32-bit division routine?

> --- In AVR-Chat@yahoogroups.com, "Enki" <enkitec@...> wrote:
>>I just deleted the mod2 and mod3 lines to transform your routine to
>> 32bit/16bit.
> Presumably, you adjusted the PC-relative addresses given with the
> branch instructions, too.  A less error-prone method is to introduce
> labels to use for the branch destinations thus letting the assembler
> figure out the branch distance.  I've been bitten more than once when
> using PC-relative addresses by adding instructions between the branch
> and destination and forgetting to adjust the offset.  The downside, of
> course, is that you have to invent a label name.
>
> The Atmel AVR Assembler documentation seems to suggest that a label
> must be on a line preceding a directive, instruction, etc.  However,
> it does accept a label on a line by itself which is, I think, the
> preferable alternative.
>
> As a side note, the gcc assembler supports the use of numeric labels
> (like 2:) and then allows you to refer to them using, for example, 2f
> and 2b to refer to the first 2: forward and the first 2: backward.
> This precludes the need to invent a label name and it is also useful
> in macros that are used multiple times, avoiding problems with
> duplicate label names.
>
> Don Kinzer
> ZBasic Microcontrollers
> http://www.zbasic.net
>
>
>
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