[Bug 95474] Bioshock Infinite and DiRT Showdown perform very poorly on any GPU with GCN >=1.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95474

--- Comment #14 from Marek Olšák <maraeo at gmail.com> ---
I've done some profiling.

Bioshock Infinite:
- the game is CPU-bound most of the time
- some small performance enhancements have landed already
- the FenceSync optimization is a work in progress, expect a 30% improvement
- most of the scratch buffer usage is for private memory, not VGPR spilling
(this may be a defect in our indirect indexing)
- if I'm not taking private memory usage into account, it's still in top 2 of
the worst VGPR spilling apps

DiRT Showdown:
- the game is GPU-bound
- there are a bunch of very slow pixel shaders using while loops, it's unclear
how to make them faster
- most of the scratch buffer usage is for VGPR spilling
- it's in top 2 of the worst VGPR spilling apps

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