https://bugs.freedesktop.org/show_bug.cgi?id=85580
--- Comment #2 from Aaron B aaronbottegal@gmail.com --- It has gotten better since I've re-compiled llvm and mesa, and moved back to just 3.5. But it still drops down to the red in the source engine FPS counter a lot still. It should be a regression, afaict, it never did it as often as it does with llvm 3.5, current mesa, radeonsi.