[llvm-commits] [llvm] r57048 - in /llvm/trunk: lib/Target/X86/X86InstrInfo.cpp test/CodeGen/X86/2008-08-31-EH_RETURN32.ll test/CodeGen/X86/2008-08-31-EH_RETURN64.ll

[Evan Cheng]

Ok. Can you guys look into this? I don't have the unwinding expertise.

I think it's fine to ignore the performance issue for this release.

Thanks,

Evan

On Oct 6, 2008, at 12:10 PM, Duncan Sands wrote:

> Hi Evan,
>
>> Do you know why it's breaking unwinding? With the patch backed out,
>> it's generating:
>
> in the testcase where I saw breakage, the problem was due to
> a miscompilation of llvm-gcc's libgcc (shared version).  In
> fact the application itself (which did a lot of throwing and
> catching) worked fine when compiled with llvm-gcc as long as
> it was linked with the system libgcc, not llvm-gcc's libgcc.
> So it looks like your patch works fine almost always, only
> there's something subtle in libgcc which it breaks.
>
> Ciao,
>
> Duncan.