On 23 Jul 2012, at 20:53, David Chisnall wrote: > On 23 Jul 2012, at 20:18, Konstantin Belousov wrote: > >> 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. > > 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: > > http://llvm.org/bugs/show_bug.cgi?id=13438 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=rev&revision=160687 DavidReceived on Tue Jul 24 2012 - 19:08:27 UTC
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