Comment # 5 on bug 89069 from Iaroslav Andrusyak

(In reply to smoki from comment #3)
>  But i tested this on Kabini, so who knows... Iaroslav can you test if
> reverting 0e9cdedd2e3943bdb7f3543a3508b883b167e427 fixes your issue?

Yes, it helps. 
i think we need something like 
R600_DEBUG=nosfmath in this case