Re: [Amforth] Compiling Amforth 4.9 - forward labels in macros

[Marcin C. <sa...@sa...>]

>> Matthias Trute <mt...@we...> wrote:
> Hi,
>
>> avrasm2 generally does not allow using not-yet-defind
>> labels in macros like this.
>
> really? I doubt it.

To be correct: ifdef returns false for 
forward references and therefore jmp is assembled
by AVRASM2. 

>> 2) add a nop after "rjmp" in the "jmp_" macro to keep
>>    sizes of the macro expansion constant.
>
> That would contradict one of the 2 intentions of
> the macro: size savings (the other one is speed).

I agree, but...

> 3) get an smart jump instruction.

... how do solve the problem:

    jmp_ A:
    nop
    nop
A:  

The final address of A depends on the size
of jmp_ expansion, that may be 1 word
or 2 words. Size of the jmp_ expansion
depends on how for A is. Isn't that
a circular reference?

//Marcin