Re: [Qemu-devel] [PATCH 2/7] nios2: Add architecture emulation support

[Richard Henderson]

On 10/18/2016 07:31 PM, Marek Vasut wrote:
> > Processing a little more data can be preferable to fewer branch
> > prediction failures.  And the best way to avoid those is to not have the
> > branch at all. Especially when it's unlikely that the data will be
> > created in the first place.
>
> OK, but I need to make sure stores to ZERO register are ignored, right ?

Yes.

Just remember that since nios2 doesn't have condition codes, where side effects 
of an instruction can be useful alone, the *only* likely case of ZERO as a 
destination register is in the (designated) NOP psuedo-op.


r~