I don't know what do you mean. The radeon driver support is not nearly complete. Yes, most major features are there, but the performance is an endless void nobody has dived into yet. There is no TGSI compiler whatsoever. The developers are fiddling with LLVM for an OpenCL support and people are wondering if reusing LLVM as TGSI compiler will be worth it. That of course will mean _another_ translation of the IR - from TGSI to LLVM IR. Also, LLVM is slooow when it comes to JIT. It's optimization passes are effective, but expensive. It cannot be used to JIT something that relies on low latency as a 3D driver.
TGSI compiler is one of the projects that has to be explicitly funded in order to launch. Until then, there will only be the interpreter delivering sub-par performance and maybe (just maybe) a (also slow) LLVM integration side project.