Date: Fri, 12 Jun 2015 08:10:54 +0800 From: Erich Dollansky <erichsfreebsdlist@alogt.com> To: Ian Lepore <ian@freebsd.org> Cc: Hans Petter Selasky <hps@selasky.org>, "freebsd-hackers@freebsd.org\" <freebsd-hackers@FreeBSD.org> Subject: Re: allow ffs & co. a binary search Message-ID: <20150612081054.4589dcc7@B85M-HD3-0.alogt.com> In-Reply-To: <1434034310.1415.2.camel@freebsd.org> References: <20150607081315.7c0f09fb@B85M-HD3-0.alogt.com> <5573EA5E.40806@selasky.org> <20150611152107.61f85189@B85M-HD3-0.alogt.com> <1434027471.1200.401.camel@freebsd.org> <20150611224347.64372a76@B85M-HD3-0.alogt.com> <1434034310.1415.2.camel@freebsd.org>
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Hi, On Thu, 11 Jun 2015 08:51:50 -0600 Ian Lepore <ian@freebsd.org> wrote: > On Thu, 2015-06-11 at 22:43 +0800, Erich Dollansky wrote: > > Hi, > > > > On Thu, 11 Jun 2015 06:57:51 -0600 > > Ian Lepore <ian@freebsd.org> wrote: > > > > > On Thu, 2015-06-11 at 15:21 +0800, Erich Dollansky wrote: > > > > On Sun, 07 Jun 2015 08:53:18 +0200 > > > > Hans Petter Selasky <hps@selasky.org> wrote: > > > > > > > Is there any reason that this whole change, userland and kernel, > > > isn't just: > > > > > > #define ffs(n) __builtin_ffs(n) > > > > I did not see this. Where is it? > > > > Of course, if this is already done, it does not have to be done > > again. > > > > Erich > > I'm not quite sure what you're asking. Both clang and gcc support > __builtin_ffs(), so I'm saying why don't we just use it and call the > whole problem solved? > so, it is not in the sources yet. Yes, then use it and let the compiler guys crack their heads. Erich
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