Re: [MiNT] Firebee Coldfire MiNT Kernel and NFS

[Vincent Rivière <vincent.riviere@freesbee.fr>]

On 05/09/2014 10:29, Andreas Schwab wrote:
> Vincent Rivière <vincent.riviere@freesbee.fr> writes:
>
> > In our case, the next instruction is BEQ, which means that only the Z flag
> > is important. And fortunately, that one is set identically by both
> > instructions.
>
> No, it isn't.

Could you please elaborate?

From the documentation posted by Thomas:

TAS:
Z - Set if the operand was zero; cleared otherwise.

BSET:
Z - Set if the bit tested is zero; cleared otherwise.

Humm... it seems you are right.
Both TAS and BSET #7 sets the bit 7.

But the Z flag is different:
- with TAS, it reflects the previous status of the whole byte
- with BSET, it reflects only the previous status of the bit 7

So care must be taken when choosing the right bit for BSET, and check 
the whole logic of the routine.

Thanks for the hint.

--
Vincent Rivière