From: Stephen Hemminger <stephen@networkplumber.org>
To: "Lu, Wenzhuo" <wenzhuo.lu@intel.com>
Cc: "Wang, Zhihong" <zhihong.wang@intel.com>,
dev@dpdk.org, "Zhang, Qi Z" <qi.z.zhang@intel.com>,
"Li, Xiaoyun" <xiaoyun.li@intel.com>,
"Richardson, Bruce" <bruce.richardson@intel.com>
Subject: Re: [dpdk-dev] [PATCH 1/3] eal/x86: run-time dispatch over memcpy
Date: Wed, 30 Aug 2017 22:05:54 -0700 [thread overview]
Message-ID: <CAOaVG16hj2AGNC4SkrRrNg2C7gctS5nsJW7j0XFE5FrzzyBKpA@mail.gmail.com> (raw)
In-Reply-To: <6A0DE07E22DDAD4C9103DF62FEBC09093B6A2D25@shsmsx102.ccr.corp.intel.com>
I was referring to gcc multiversion
https://gcc.gnu.org/wiki/FunctionMultiVersioning
On Aug 30, 2017 6:24 PM, "Lu, Wenzhuo" <wenzhuo.lu@intel.com> wrote:
> Hi Stephen,
>
>
> > -----Original Message-----
> > From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> > Sent: Thursday, August 31, 2017 2:01 AM
> > To: Li, Xiaoyun <xiaoyun.li@intel.com>
> > Cc: Richardson, Bruce <bruce.richardson@intel.com>; dev@dpdk.org; Lu,
> > Wenzhuo <wenzhuo.lu@intel.com>; Wang, Zhihong
> > <zhihong.wang@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>
> > Subject: Re: [dpdk-dev] [PATCH 1/3] eal/x86: run-time dispatch over
> memcpy
> >
> > On Fri, 25 Aug 2017 10:06:11 +0800
> > Xiaoyun Li <xiaoyun.li@intel.com> wrote:
> >
> > > This patch dynamically selects functions of memcpy at run-time based
> > > on CPU flags that current machine supports. This patch uses function
> > > pointers which are bind to the relative functions at constrctor time.
> > > To make AVX512 instructions pass compilation, enable the switch in
> > > makefile.
> > >
> > > Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
> >
> > Recent versions of GCC also have better ways to handle this.
> I think the assumption of using the instructions is that we believe we can
> do better than the compiler. If it turns out not, maybe we need to change
> the instructions back to C. But it's another story.
>
>
next prev parent reply other threads:[~2017-08-31 5:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-25 2:06 [dpdk-dev] [PATCH 0/3] dynamic linking support Xiaoyun Li
2017-08-25 2:06 ` [dpdk-dev] [PATCH 1/3] eal/x86: run-time dispatch over memcpy Xiaoyun Li
2017-08-30 14:56 ` Ananyev, Konstantin
2017-08-30 17:51 ` Bruce Richardson
2017-08-31 1:21 ` Lu, Wenzhuo
2017-08-30 18:00 ` Stephen Hemminger
2017-08-31 1:23 ` Lu, Wenzhuo
2017-08-31 5:05 ` Stephen Hemminger [this message]
2017-08-31 5:24 ` Li, Xiaoyun
2017-08-25 2:06 ` [dpdk-dev] [PATCH 2/3] app/test: run-time dispatch over memcpy perf test Xiaoyun Li
2017-08-25 2:06 ` [dpdk-dev] [PATCH 3/3] efd: run-time dispatch over x86 EFD functions Xiaoyun Li
2017-09-01 8:56 ` [dpdk-dev] [PATCH v2 0/3] dynamic linking support Xiaoyun Li
2017-09-01 8:57 ` [dpdk-dev] [PATCH v2 1/3] eal/x86: run-time dispatch over memcpy Xiaoyun Li
2017-09-01 9:16 ` Ananyev, Konstantin
2017-09-01 9:28 ` Li, Xiaoyun
2017-09-01 10:38 ` Ananyev, Konstantin
2017-09-04 1:41 ` Li, Xiaoyun
[not found] ` <B9E724F4CB7543449049E7AE7669D82F44216E@SHSMSX101.ccr.corp.intel.com>
[not found] ` <B9E724F4CB7543449049E7AE7669D82F442FE6@SHSMSX101.ccr.corp.intel.com>
2017-09-12 2:27 ` Li, Xiaoyun
2017-09-20 6:57 ` Li, Xiaoyun
2017-09-01 15:34 ` Stephen Hemminger
2017-09-01 8:57 ` [dpdk-dev] [PATCH v2 2/3] app/test: run-time dispatch over memcpy perf test Xiaoyun Li
2017-09-01 8:57 ` [dpdk-dev] [PATCH v2 3/3] efd: run-time dispatch over x86 EFD functions Xiaoyun Li
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