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From: David Chisnall <theraven@FreeBSD.org>
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To: Konstantin Belousov <kostikbel@gmail.com>
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Cc: Dimitry Andric <dim@FreeBSD.org>, freebsd-current@FreeBSD.org,
	Kim Culhan <w8hdkim@gmail.com>
Subject: Re: -current build failure
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On 23 Jul 2012, at 20:53, David Chisnall wrote:

> On 23 Jul 2012, at 20:18, Konstantin Belousov wrote:
>=20
>> Longer description is that pc_curthread is offset 0 if %gs-based.
>> The dereferenced pointer point to the struct thread, which contains
>> td_proc pointer at offset 8. Instead, clang seems to dereference
>> td_proc from offset 8 based on %gs, or something similar.
>=20
> This appears to be a bug in the LLVM X86 back end.  It is performing =
an invalid fold of the two loads.  I have filed this bug:
>=20
> http://llvm.org/bugs/show_bug.cgi?id=3D13438

And fixed it in LLVM r160687.  Since it's a single-line change, we can =
probably pull it into our version.

dim: http://llvm.org/viewvc/llvm-project?view=3Drev&revision=3D160687

David