[llvm-dev] [DWARF] prologue_end fix not working for VLIW

[Verena Beckham via llvm-dev]

Hi,

I found that prologue_end markers where badly placed in my test, and 
applied https://reviews.llvm.org/D41762 in the hope that it would fix it 
(I'm on 4.0.1).
However, this fix doesn't work for VLIW architectures. At this point 
we're iterating over bundles, not MachineInstructions, and the 
FrameSetup flag is set on MachineInstructions, not bundles.
If bundling happens in the prologue we might insert the prologue_end 
marker too early.
Instead, we need to check whether all instructions in the bundle (if 
bundled) have the FrameSetup flag.
This assumes we want the prologue_end marker just before the first 
instruction not in the prologue. I couldn't find anything official about 
the placement in this case in the DWARF spec.
Since I am working on a custom target I'm afraid I can't provide any 
test cases...

Thanks,

-- 
Verena Beckham

Senior Principal Software Engineer, Compilers

Codeplay Software Ltd
Level C, Argyle House, 3 Lady Lawson Street, Edinburgh, EH3 9DR
Tel: 0131 466 0503
Fax: 0131 557 6600
Website: http://www.codeplay.com

This email and any attachments may contain confidential and /or 
privileged information and  is for use  by the addressee only. If you 
are not the intended recipient, please notify Codeplay Software Ltd 
immediately and delete the message from your computer. You may not copy 
or forward it,or use or disclose its contents to any other person. Any 
views or other information in this message which do not relate to our 
business are not authorized by Codeplay software Ltd, nor does this 
message form part of any contract unless so stated.
As internet communications are capable of data corruption Codeplay 
Software Ltd does not accept any responsibility for any changes made to 
this message after it was sent. Please note that Codeplay Software Ltd 
does not accept any liability or responsibility for viruses and it is 
your responsibility to scan any attachments.
Company registered in England and Wales, number: 04567874
Registered office: Regent house, 316 Beulah Hill, London, United 
Kingdom, SE19 3HF