[LLVMdev] Problem with cross class joins in the RegisterCoalescer

[Anton Korobeynikov]

Hi Patrik,

> The "-disable-cross-class-join" flag prevents this problem from
> happening but I'm afraid it will also prevent other (non-problematic)
> cross class joins from happening so I'm hesitant to use it.
>
> So, should this not happen, or is the flag needed, or is this just a
> sign that we have a really weird or buggy register model?
Is this some recent problem? Or it's seen with LLVM 3.0 as well?

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University