[PATCH] aarch64: Optimized memcmp for medium to large sizes

[Siddhesh Poyarekar]

On Tuesday 06 March 2018 06:45 PM, Adhemerval Zanella wrote:
> On 02/02/2018 02:50, Siddhesh Poyarekar wrote:
>> This improved memcmp provides a fast path for compares up to 16 bytes
>> and then compares 16 bytes at a time, thus optimizing loads from both
>> sources.  The glibc memcmp microbenchmark retains performance (with an
>> error of ~1ns) for smaller compare sizes and reduces up to 31% of
>> execution time for compares up to 4K on the APM Mustang.  On Qualcomm
>> Falkor this improves to almost 48%, i.e. it is almost 2x improvement
>> for sizes of 2K and above.
>>
>> 	* sysdeps/aarch64/memcmp.S: Widen comparison to 16 bytes at a
>> 	time.
> 
> LGTM with some comments clarifications below.

Thanks, fixed up and pushed.

Siddhesh