Re: [PATCH, v3] ARM: Integrate Cortex-A15 optimized memcpy using NEON/VFP.

[Will Newton <will dot newton at linaro dot org>]

On 11 April 2013 21:14, Will Newton <will.newton@linaro.org> wrote:
> On 11 April 2013 18:23, Ramana Radhakrishnan <ramrad01@arm.com> wrote:
>> On 04/03/13 17:43, Will Newton wrote:
>>>
>>>
>>>         * libc/machine/arm/memcpy-stub.c: Use generic memcpy if unaligned
>>>         access is not enabled.
>>>         * libc/machine/arm/memcpy.S: Faster memcpy implementation for
>>>         Cortex A15 cores using NEON and VFP if available.
>>>
>>> Signed-off-by: Will Newton <will.newton@linaro.org>
>>
>>
>>
>> You know this looks really good but what benefit does it provide on A15  ?
>>
>>
>> While this
>> http://sourceware.org/ml/newlib/2013/msg00176.html
>>
>> mentions improvements on a pandaboard - the subject indicates that it
>> improves performance on an A15 :)
>
> I'm glad you asked Ramana! ;-)
>
> Below are some numbers form a Cortex A15 I just acquired. The pattern
> seems pretty similar, faster in the majority of cases for the
> cortex-strings benchmarks.

The same numbers are attached, which may be easier to read.

Attachment: a15-memcpy-benchmarks.txt
Description: Text document