macro's and local variables

[Mischa Baars]

On 10/16/2012 08:20 PM, Ian Lance Taylor wrote:
> On Tue, Oct 16, 2012 at 11:12 AM, Mischa Baars <mjbaars1977@gmail.com> wrote:
>>> Also one uses i and the other uses j, and that matters because
>>> you are invoking them in a loop that also uses i.
>> This is exactly what I'm pointing at. Apart from the register naming, I was
>> expecting the same values to be assigned to the respective registers. This
>> does not happen, because 'i' is not a local but a global value.
> Yes.  That is how assembler macros work.
So macro B is the only correct macro, as I understand.
>
> Assembler macros are not a high level programming language.  They are
> macros: bodies of text that are expanded with argument values
> substituted in textually.  You may want to read about how \@ is
> expanded in a macro body.
I found the link: 
http://sourceware.org/binutils/docs-2.22/as/Macro.html#Macro

However, I do not understand. Do you have an example?
>
> Ian