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

[Marek Vasut]

On 10/19/2016 06:18 PM, Richard Henderson wrote:
> 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.

Got it, thanks.

-- 
Best regards,
Marek Vasut