[Mesa-dev] [Bug 111340] [LLVM] DIRT 3 horrible performance when Shadows set to very high

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111340

            Bug ID: 111340
           Summary: [LLVM] DIRT 3 horrible performance when Shadows set to
                    very high
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: gr.muench at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

Once you set Shadows to very high in the Options Menu the game slows down. You
have to use DXVK to run the game, version doesnt matter.

I already reported this last year when I was still using my Radeon HD 7970:
https://github.com/doitsujin/dxvk/issues/67#issuecomment-421925690

The game takes a nose dive from 134 to 29 fps once you switch the settings.

I tried today with my new Vega 56 and ACO:
with LLVM: 72,5 fps
with ACO: 206,3 fps

So we finally have the proof that LLVM is causing this. This might be the same
problem we have with the long standing and still valid bug:
https://bugs.freedesktop.org/show_bug.cgi?id=100069

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