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Re: [PATCH] [x86_32] Don't use SSE4_2 instructions on Intel Silvermont Micro Architecture.
- From: Liubov Dmitrieva <liubov dot dmitrieva at gmail dot com>
- To: "H.J. Lu" <hjl dot tools at gmail dot com>
- Cc: "Carlos O'Donell" <carlos at redhat dot com>, GNU C Library <libc-alpha at sourceware dot org>
- Date: Mon, 1 Jul 2013 23:27:11 +0400
- Subject: Re: [PATCH] [x86_32] Don't use SSE4_2 instructions on Intel Silvermont Micro Architecture.
- References: <CAHjhQ93YUtMz14Aj7JfhJ7Tq++eC+23cA6yubh1KPRpKTvvkaw at mail dot gmail dot com> <51D0967A dot 7050102 at redhat dot com> <CAHjhQ92mTi8OmY7RBC3=sCaX=-xbgGH82pCBz4fCQkBLJcNqOA at mail dot gmail dot com> <CAMe9rOr8o7OnB0T0tG50J7oXmJJF_XOiUDLK6Gsc1tMu-NOFrQ at mail dot gmail dot com>
It is disabled for both. Where do you see it doesn't?
--
Liubov
On Mon, Jul 1, 2013 at 7:12 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Mon, Jul 1, 2013 at 5:46 AM, Liubov Dmitrieva
> <liubov.dmitrieva@gmail.com> wrote:
>> It doesn't look very good when I summarized the results because there
>> are too many small lengths cases in your benchmarks.
>> And small cases are more inaccurate.
>> Ssse3 looks asymptotically faster. Actually it would better to use
>> sse2 unaligned versions for Silvermont but we don't have it in glibc
>> at the moment.
>> Bot sse4_2 and ssse3 are not the best for SLM.
>>
>
> Why is SSE4.2 strcasecmp disabled only for libc.a,
> not libc.so? Libc.so is used by most of applications.
>
>
> --
> H.J.