This is the mail archive of the
libc-alpha@sourceware.org
mailing list for the glibc project.
Re: [PATCH] Rename __memcmp_sse4_2 to __memcmp_sse4_1.
- From: Andreas Jaeger <aj at suse dot com>
- To: Matt Turner <mattst88 at gmail dot com>
- Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, libc-alpha at sourceware dot org
- Date: Wed, 10 Jul 2013 06:37:51 +0200
- Subject: Re: [PATCH] Rename __memcmp_sse4_2 to __memcmp_sse4_1.
- References: <CAMe9rOreowCOEH+6zRaRNk_p9sYe3T2bhwPRbKpybW9cO0BhJA at mail dot gmail dot com> <1373419029-19125-1-git-send-email-mattst88 at gmail dot com>
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
--
Andreas Jaeger aj@{suse.com,opensuse.org} Twitter/Identica: jaegerandi
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn,Jennifer Guild,Felix Imendörffer,HRB16746 (AG Nürnberg)
GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126