How to track down a bad llvm optimization pass

[Johan Engelen via digitalmars-d-ldc]

On Wednesday, 6 July 2016 at 18:00:40 UTC, Joakim wrote:
>
> Johan, you mentioned this other shift bug that you ran into:
>
> https://github.com/dlang/phobos/pull/4509
>
> Was that just one that you had hit recently or did you go 
> checking all 20+ uses of logical right shift in Phobos to look 
> for bugs?

Yeah that's the one I wrote about before. I discovered it after a 
long time debugging :(

I did check the other >>>= in Phobos and they looked OK, but I 
did not spend much time on checking them.