[PATCH] Rename __memcmp_sse4_2 to __memcmp_sse4_1.

[Matt Turner]

On Wed, Jul 10, 2013 at 11:16 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Wed, Jul 10, 2013 at 10:41 AM, Matt Turner <mattst88@gmail.com> wrote:
>> On Wed, Jul 10, 2013 at 8:30 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
>>> On Tue, Jul 9, 2013 at 9:37 PM, Andreas Jaeger <aj@suse.com> wrote:
>>>> On 07/10/2013 03:17 AM, Matt Turner wrote:
>>>>> It uses SSE 4.1 instructions (ptest) but no SSE 4.2 instructions.
>>>>
>>>> There are two parts to this: It should only run on cpus with those
>>>> instructions but we also need to ensure that it gives a better
>>>> performance on such cpus. HJ, Matt, please do run performance tests on a
>>>> variety of affected cpus to show that this change really helps in all cases,
>>>>
>>>> Andreas
>>>
>>> Only Penryn has SSE4.1 without SSE4.2.  Liubov, can
>>> you compare performance of memcmp-sse4.S vs
>>> memcmp-ssse3.S on Penryn?
>>
>> Is it also the case that this path would now be used on Silvermont?
>
> It is used on Silvermont since it supports SSE4.2
>
> --
> H.J.

To confirm, setting bit_Slow_SSE4_2 on Silvermont (which we do)
wouldn't prevent this path from executing?