On Wed, Jul 25, 2012 at 09:03:58AM +0100, David Chisnall wrote: > On 24 Jul 2012, at 23:43, Konstantin Belousov wrote: > > > As kan rightfully notes, the assumption that &%fs:0 == *%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.
Try to differentiate on the memory layout model, the -mcmodel=kernel thing. It shall be passed down to the very last stage of the backend, I believe. > > > Sigh > > Very helpful, thank you. > > David
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