Date: Wed, 25 Jul 2012 09:03:58 +0100 From: David Chisnall <theraven@freebsd.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Kim Culhan <w8hdkim@gmail.com>, freebsd-current@freebsd.org, Dimitry Andric <dim@freebsd.org> Subject: Re: -current build failure Message-ID: <F898FF69-1A80-4380-BAEE-2282BA71C3A7@freebsd.org> In-Reply-To: <20120724224338.GZ2676@deviant.kiev.zoral.com.ua> References: <CAKZxVQV5xhFDN_WbTk-EMoQ18N8u1f4YhqKSJQFUzbX4NZxhUA@mail.gmail.com> <50097BF0.9010103@FreeBSD.org> <CAKZxVQXC6DuX5UTn3goNM9toxSVkP8-7bazTk%2Ba7yLEy7RsJYA@mail.gmail.com> <20120721211628.GE2676@deviant.kiev.zoral.com.ua> <6006581B-6B1C-4DFB-8662-3EB35869CA5F@FreeBSD.org> <20120722180119.GJ2676@deviant.kiev.zoral.com.ua> <20120723191856.GR2676@deviant.kiev.zoral.com.ua> <088BF877-50E6-42C5-98EF-DAB0FA52C348@freebsd.org> <05368BFA-F5F6-49D4-BE63-7C9360E54F54@FreeBSD.org> <20120724224338.GZ2676@deviant.kiev.zoral.com.ua>
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On 24 Jul 2012, at 23:43, Konstantin Belousov wrote: > As kan rightfully notes, the assumption that &%fs:0 =3D=3D *%fs:0 = holds for > userspace on amd64, and the same is true for %gs userspace on i386. > The change you committed to clang/llvm/whatever it called just breaks > useful optimization for FreeBSD. If you can suggest a way of differentiating the kernel and userspace = compilation targets, then I would be happy to hear it and will make the = appropriate change. Until then, I would rather have slightly = sub-optimal code in userspace than incorrect code in kernelspace. > Sigh Very helpful, thank you. David=
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