From owner-svn-src-head@FreeBSD.ORG  Mon Feb  9 21:55:53 2015
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx2.freebsd.org (mx2.freebsd.org [8.8.178.116])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 9F69D20C;
 Mon,  9 Feb 2015 21:55:53 +0000 (UTC)
Received: from hammer.pct.niksun.com (freefall.freebsd.org
 [IPv6:2001:1900:2254:206c::16:87])
 by mx2.freebsd.org (Postfix) with ESMTP id 33E1D3B83;
 Mon,  9 Feb 2015 21:55:53 +0000 (UTC)
Message-ID: <54D92CE8.1030803@FreeBSD.org>
Date: Mon, 09 Feb 2015 16:55:52 -0500
From: Jung-uk Kim <jkim@FreeBSD.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
 rv:31.0) Gecko/20100101 Thunderbird/31.4.0
MIME-Version: 1.0
To: John Baldwin <jhb@freebsd.org>, src-committers@freebsd.org
Subject: Re: svn commit: r278474 - head/sys/sys
References: <201502092103.t19L3OAn013792@svn.freebsd.org>
 <1698688.fEq0HxqPxg@ralph.baldwin.cx>
In-Reply-To: <1698688.fEq0HxqPxg@ralph.baldwin.cx>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 8bit
Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 09 Feb 2015 21:55:53 -0000

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 02/09/2015 16:08, John Baldwin wrote:
> On Monday, February 09, 2015 09:03:24 PM John Baldwin wrote:
>> Author: jhb Date: Mon Feb  9 21:03:23 2015 New Revision: 278474 
>> URL: https://svnweb.freebsd.org/changeset/base/278474
>> 
>> Log: Use __builtin_popcnt() to implement a BIT_COUNT() operation 
>> for bitsets and use this to implement CPU_COUNT() to count the 
>> number of CPUs in a cpuset.
>> 
>> MFC after:	2 weeks
> 
> Yes, __builtin_popcnt() works with GCC 4.2.  It should also allow 
> the compiler to DTRT in userland uses of this if -msse4.2 is 
> enabled.

Back in 2012, when I submitted a similar patch, bde noted
__builtin_popcount*() cannot be used with GCC 4.2 for *kernel* because
it emits a library call.

http://docs.freebsd.org/cgi/mid.cgi?20121116171923.L1135

FYI...

Jung-uk Kim
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2

iQEcBAEBCAAGBQJU2SzhAAoJEHyflib82/FGzgoH/2mfCZTX6J84MYpfuJV5dnLQ
97Itozifc8qBNDCOIQ1PZNgxPed9U8Ma0o3Rntfl5X2VeAIc/c5JJhvQITUdhnn7
fyW5FcpvJGpHLcUWlTMT5CrZgmDswi6h1jIsbD6AKoIVNGau5kPhpn4LF7f19YU0
0Vm8L96gGrxjJb3SWdRC4znP1ezTCw3rUEyk2oPZBn69zoat1vBcV7WtathStcBg
noIEydo6C5e4EC5SKbTi29aNd1KGafRIukkC8+jnZNCc8nYEVsUEX5SarKYmmpec
NTSLfboTJ5YXZGsvIgGzld0Z/Hn54v8O0hhG1QO4kWh3wN40NVgNL0vkeiveqwE=
=WDqA
-----END PGP SIGNATURE-----