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Re: PATCH: 64bit SSE4 optimized memcmp
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Ulrich Drepper <drepper at redhat dot com>
- Cc: libc-alpha at sourceware dot org
- Date: Tue, 13 Apr 2010 07:11:32 -0700
- Subject: Re: PATCH: 64bit SSE4 optimized memcmp
- References: <20100412224015.GA24384@intel.com> <4BC478D1.4030708@redhat.com>
On Tue, Apr 13, 2010 at 6:59 AM, Ulrich Drepper <drepper@redhat.com> wrote:
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> On 04/12/2010 03:40 PM, H.J. Lu wrote:
>> This is 64bit SSE4 optimized memcmp. It improves memcmp by upto 3X
>> on Intel Core i7.
>
> I don't see any SSE4.2 instructions being used. ?ptest is an SSE4.1
> instruction.
You are right. It is SSE4.1.
> Also, your Makefile change contains references to a whole set of other
> files which haven't yet been submitted and therefore the patch doesn't
> apply.
>
We are working on SSSE3 optimized memcpy. It is not ready yet.
Please ignore it. I will submit a new one.
Thanks.
--
H.J.