[PATCH 1/3] aarch64: Optimized memset specific to AmpereComputing emag

[Siddhesh Poyarekar]

On 20/12/18 2:45 PM, Siddhesh Poyarekar wrote:
> On 18/12/18 3:33 PM, Feng Xue wrote:
>> This version uses general register based memory store instead of
>> vector register based, for the former is faster than the latter
>> in emag.
> 
> Barring a couple of instances that show a 5%+ difference from 
> __memset_generic (which also seems sporadic, maybe due to noise?), 
> everything else seems to be in the 1-2% range.  Is that a significant 
> enough difference to warrant a new variant?
> 
> It may not be worth adding another variant for a mere 1-2% overall gain 
> for string routines but maybe I've misread the results and you have a 
> better justification for this.  Please let me know if you do.

Ugh, I have in fact misread the results; sorry about that.  The 
compare_strings.py script has the -b flag to change the baseline to 
compare against, so you can use that to show results relative to 
__memset_generic so that it's clearer.

Looks fine to me.

Siddhesh