How to track down a bad llvm optimization pass

Tue Jun 21 00:00:35 PDT 2016

On Tuesday, 21 June 2016 at 05:51:56 UTC, Joakim wrote:
> On Monday, 20 June 2016 at 20:15:52 UTC, Rainer Schuetze wrote:
>>
>>
>> On 19.06.2016 08:58, Joakim wrote:
>>> [...]
>>
>> If it fails in a specific optimization pass, it has already 
>> passed a number of verification passes. When I posted some bug 
>> reports, the LLVM people (who have been very helpful) 
>> considered it an LLVM bug if an invalid IR passes the 
>> verifier. So even if some assumptions are broken, I would 
>> suggest to report to the LLVM bug tracker.
>
> OK, will do.  I think the fact that the exact same ldc frontend 
> linked with llvm 3.7.1 doesn't have this problem, only when 
> linked against llvm 3.8.0, indicates this most likely isn't a 
> problem on our end.

Filed: https://llvm.org/bugs/show_bug.cgi?id=28224