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From: John Baldwin <jhb@freebsd.org>
To: src-committers@freebsd.org
Subject: Re: svn commit: r278474 - head/sys/sys
Date: Mon, 09 Feb 2015 16:08:59 -0500
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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.

-- 
John Baldwin