[Coco] lwtools assembler difference

[Tormod Volden]

On Tue, Sep 1, 2015 at 9:16 PM, Dave Philipsen wrote:
> Well, in my comparison of the code generated by the lwtools assembler and
> the stock OS9 assembler I have found a quirk of the lwtools assembler.  I
> won't call it an error because it appears that the outcome is not affected
> and it seems to be a minor thing.  On every other assembler I've used
> including AS6809, CSC6809, and the stock OS9 assembler the following
> assembly source:
>
> ldb  ,x
>  or
> ldb 0,x
>
> is assembled in machine code as:
>
> E6 84
>
> which is the indexed addressing mode with no offset
> However, the lwtools assembler (evidently) assembles in machine code as:
>
> E6 00
>
> which is the indexed addressing mode with a 5-bit offset with the offset
> being zero.

Please read about the "index0tonone" pragma in the manual
http://lwtools.projects.l-w.ca/manual/manual.html#AEN628

Is it possible that you have disabled this pragma?

Regards,
Tormod

>
> I dont have a copy of EDTASM anymore so I can't say how it would assemble
> it.  This just seems to be the case of a smart assembler which determines
> the given offset to be zero and thus translates it as a "no offset" postbyte
> as opposed to a "5-bit offset" postbyte.
>
> Dave Philipsen