From mboxrd@z Thu Jan  1 00:00:00 1970
X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/7074
Path: news.gmane.org!not-for-mail
From: Denys Vlasenko <vda.linux@googlemail.com>
Newsgroups: gmane.linux.lib.musl.general
Subject: Re: [PATCH] x86_64/memset: use "small block" code for blocks
 up to 30 bytes long
Date: Wed, 18 Feb 2015 10:05:31 +0100
Message-ID: <CAK1hOcOSxzkoC=ZuC_jE3O+rSVMHGpPWumssvsbbKYSOM9PgYw@mail.gmail.com>
References: <20150215040655.GM23507@brightrain.aerifal.cx> <CAK1hOcPQ=mADeAUP3i-Xt3rvHmgUrVVoz2yUEOkUEYQ2xRVN2g@mail.gmail.com>
 <20150215150313.GO23507@brightrain.aerifal.cx> <CAK1hOcMgM5j-EtOk2aPao6ma=M7PVyA_3U=22+8HbPu+S9GXdw@mail.gmail.com>
 <20150216173634.GA23507@brightrain.aerifal.cx> <CAK1hOcOEznkzfBGDJwWvdaNXTKwEiiz88r=9tEQF--T=CQvXJg@mail.gmail.com>
 <20150217161222.GF23507@brightrain.aerifal.cx> <CAK1hOcOaN4SnpO2jMGib3tFEf+c8=Tu8Nwi2YnOhzefpSSqTng@mail.gmail.com>
 <20150217174045.GH23507@brightrain.aerifal.cx> <CAK1hOcMtnZLy7Kw36YQWdi3tzmACepAWjQ=_82GuE_NUHd0hpw@mail.gmail.com>
 <20150217211247.GI23507@brightrain.aerifal.cx>
Reply-To: musl@lists.openwall.com
NNTP-Posting-Host: plane.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
X-Trace: ger.gmane.org 1424250371 3651 80.91.229.3 (18 Feb 2015 09:06:11 GMT)
X-Complaints-To: usenet@ger.gmane.org
NNTP-Posting-Date: Wed, 18 Feb 2015 09:06:11 +0000 (UTC)
Cc: musl <musl@lists.openwall.com>
To: Rich Felker <dalias@libc.org>
Original-X-From: musl-return-7087-gllmg-musl=m.gmane.org@lists.openwall.com Wed Feb 18 10:06:10 2015
Return-path: <musl-return-7087-gllmg-musl=m.gmane.org@lists.openwall.com>
Envelope-to: gllmg-musl@m.gmane.org
Original-Received: from mother.openwall.net ([195.42.179.200])
	by plane.gmane.org with smtp (Exim 4.69)
	(envelope-from <musl-return-7087-gllmg-musl=m.gmane.org@lists.openwall.com>)
	id 1YO0aA-0002RZ-NQ
	for gllmg-musl@m.gmane.org; Wed, 18 Feb 2015 10:06:10 +0100
Original-Received: (qmail 1789 invoked by uid 550); 18 Feb 2015 09:06:08 -0000
Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm
Precedence: bulk
List-Post: <mailto:musl@lists.openwall.com>
List-Help: <mailto:musl-help@lists.openwall.com>
List-Unsubscribe: <mailto:musl-unsubscribe@lists.openwall.com>
List-Subscribe: <mailto:musl-subscribe@lists.openwall.com>
Original-Received: (qmail 1737 invoked from network); 18 Feb 2015 09:06:03 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=googlemail.com; s=20120113;
        h=mime-version:in-reply-to:references:from:date:message-id:subject:to
         :cc:content-type;
        bh=EG/abwLfJaSf8ViPGzhLKb4Fz5j64T0uzhnCiawQ2eI=;
        b=DCXdXh6EAucI20AwfFpz5hIb9Rjr9iQ6KFwDDTM3IPeVZoNMBb705X2jijtDhH9sRK
         Ltg/1zb1H9k2qVowUsHMnApOlxc45ydLqJJjIoa84YJKWDoietIJLNDv3rh8fM1T+x+X
         71gjT0E1Z4xFRdPsYEpMZXW5dRr5WWf+Lthd3NvrKl829W9SnqumawnqwFbvXSeraOJs
         Ua/A+DUs0eS5dOVu/HpnWcKw2ZTAQiKO9X/4GS9vZFFeoBHv8qcZjyYSqoFKcWaYKPsB
         3CsdUZtovrKYRoX/zlgRG5v47/mJglFEwb1jyuC2QtZBfY/QDqEaflcsODNivAcSLHhO
         bvWQ==
X-Received: by 10.140.23.199 with SMTP id 65mr1244832qgp.84.1424250351801;
 Wed, 18 Feb 2015 01:05:51 -0800 (PST)
In-Reply-To: <20150217211247.GI23507@brightrain.aerifal.cx>
Xref: news.gmane.org gmane.linux.lib.musl.general:7074
Archived-At: <http://permalink.gmane.org/gmane.linux.lib.musl.general/7074>

On Tue, Feb 17, 2015 at 10:12 PM, Rich Felker <dalias@libc.org> wrote:
> For
> me, I get ~1 cycle difference for a number of the small runs, but on
> your test that measures rates in a way that's probably more applicable
> to real-world use, there was no measureable difference one way or the
> other.

We had an enjoyable bike shed painting session, don't we?

"Optimizing memset", a must for anyone who knows assembly :D