[llvm] r289266 - Fix LLVM's use of DW_OP_bit_piece in DWARF expressions.

[Adrian Prantl via llvm-commits]

Thanks for letting me know! I will take a look. Could you please file a PR for this and assign it to me?

-- adrian
> On Aug 25, 2017, at 9:07 AM, Joerg Sonnenberger <joerg at bec.de> wrote:
> 
> On Fri, Dec 09, 2016 at 08:43:40PM -0000, Adrian Prantl via llvm-commits wrote:
>> Author: adrian
>> Date: Fri Dec  9 14:43:40 2016
>> New Revision: 289266
>> 
>> URL: http://llvm.org/viewvc/llvm-project?rev=289266&view=rev
>> Log:
>> Fix LLVM's use of DW_OP_bit_piece in DWARF expressions.
> 
> Hello Adrian,
> this breaks debugging on Sparc64. Try to build:
> 
>  long double a; fn1() { long double _Complex b = a = b * 1.0L; }
> 
> with -O2 -g -target sparc64 and it will assert. It seems like the new
> logic in addMachineRegister gets confused by the multiple layers of
> aliasing for Q0.
> 
> Joerg