[LLVMdev] llvm register coalescing

[Rafael Espíndola]

2012/2/24 Maurice Marks <maurice.marks at gmail.com>:
> I wanted to update the llvm list on an offline discussion I was having with
> Rafael about a problem we have been seeing trying to compile an
> "interpreter" type of program with clang. It was producing a huge number of
> spills, something we had seen in llvm 2.8, and it seemed to have recurred in
> 3.0. Following Rafael's advice we added -disable-early-taildup to llc and
> the spills disappeared. It would be nice if we could pass such switches
> directly through the clang command line. Is there a way to do that?

I think you can use -mllvm or something like that. It would be really
nice if you could try finding out why we produce so many spills. Is
the coalescer failing for some reason?

> thanks for your help Rafael!
>
> /maurice
>

Cheers,
Rafael